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Acorn A400 Service Manual

1. Adjust the colour monitor to ensure adequate contrast e Inspect all the mechanical parts of the test equipment and replace any parts as necessary Also if required Ensure that the printer has sufficient paper Connect the printer and monitor to the mains supply Do NOT turn on The test disc The test disc contains various options which are selected from menus For example the first menu is Dealer Test Menu 1 A300 A400 Tests 2 Podules amp Upgrades 3 Load Save CMOS RAM 4 Keyboard Test 5 Quit to desktop SELECT OPTION To select an option type its number Some options lead to further menus other options run tests immediately See the relevant test procedure Note that in the test software menus expansion cards are referred to by their former name Podules There are two types of tests subjective and non subjective The test program passes or fails the equipment on the non subjective tests however you must judge whether the equipment passes or fails the subjective tests Error messages If a message is expected and has not appeared within 30 seconds you must record the fault disconnect the machine and repair before retesting Fault finding information Asoo amp R140 Service Manual fa test fails then you should record the fault and attempt to continue with the tests You should also note any other failures but bear in mind the possibility that these failures are caused by
2. a00 1 amp R140 Service Manual 420 1 amp 440 1 Lower Case Assembly Part No Description Qty Component number 6 0176 005 DISC DRIVE CABLE ASSY 7 0176 009 BATTERY HOLDER ASSY 8 0176 010 FAN ASSEMBLY 1 9 10 0276 004_ REAR MOULDING 1 11 0276 007 BOTTOM METALWORK 1 12 0276 010 L H BUSBAR 1 13 0276 011 R H BUSBAR 1 14 0276 012 BLANKING PANEL 2 15 16 0276 026 BACKPLANE SUPPORT BAR 1 17 0276 033 FAN FILTER CLAMP 1 18 0276 034 FAN FILTER 1 19 0276 037 PCB SIDE SLIDE GUIDE 2 24 0177 002 HDISC CABLE ASSY 34W 1 25 0177 003 HDISC CABLE ASSY 20W 1 29 j 0183 002 55W 240V PSU 1 30 0183 004 3 5 X 1 1MB FLOPPY DISC DRIVE 1 31 0183 007 VIDEO BNC CABLE ASSY 1 32 0183 009 PCB EARTH CABLE ASSY 1 33 0183 040 SYNC BNC CABLE ASSY 1 34 0183 040 4 WAY BACKPLANE 1 38 0283 012 HARD DISC BRACKET 1 39 0283 013 1 FLOPPY DRIVE BRACKET 40 41 43 0283 016 44 45 46 47 48 RH DRIVE SADDLE SCREW M2 5 X 10 PAN HD POSI SCREW M3 X 6 PAN HD POSI SCREW M4 X 35 PAN HD POSI SCREW NO 4 X 1 4 PAN HD POSI 12 60 Parts list LA 40011 8 R140 Service Manual Part No Description Component number SCREW NO4 X 3 8 PLS PAN POS NUT M4 STL FULL 0882 949 SPIRE CLIP NO 6 WASHER M2 5 PLN STL WASHER M4 SPRF IT STL WASHER M3 5 SPRF IT STL WASHER M3 SPRF IT STL RIVET POP 3 2D DOR D RIVET POP 3 2D X 4 4T MAT SPACER NYLON 8MM PCB
3. Upgrading in the Appendices Remove the two backplane mounting screws unplug the backplane and rest it on top of the PSU There is no need to disconnect the power leads 4 Unplug the hard disc 34 way SK11 control and 20 way SK10 data connectors from the main PCB 5 Stand the unit up on its left side and remove the two screws and star washers from the underside Disassembly and assembly 17 A40011 amp R140 Service Manual securing the rear bus bars DRIVE BRACKET FIX a enim PEC YET FAN KT SK9 UNDER 6 Remove the three screws from the underside securing the rear moulding 7 Stand the unit back on its feet and begin to withdraw the rear moulding with the main PCB attached out of the case When it becomes accessible remove the nut securing the earth strap to the drive support bracket from the main PCB Continue withdrawing the main PCB supporting the front edge of the PCB as soon as it is accessible Floppy disc drive A single internal floppy disc drive is fitted as standard To remove the drive see the Second floppy disc drive installation instructions in the Appendices 18 Power supply unit CAUTION DOUBLE POLE NEUTRAL FUSING The PSU is fitted with a double pole switch and both the Live and Neutral lines are fused To remove the PSU first remove the top cover as detailed above Ensure that all low voltage captive leads are disconnected an
4. Enter the defects recorded by the manufacturer on the label on the hard disc unit Use option D to correct any mistakes made when making entries Once you have entered the defects this part of the menu is restored to the display To format the hard disc Type A lt RETURN gt The screen then displays the message Do you want to soak test the hard disc for defects Y N EITHER Press Y lt RETURN gt to format and verity the drive followed by a continuous soak test without display As no defects will be reported this soak test serves as a confidence test only The screen then displays the message Are you certain you want to format drive 4 Y N Type Y lt RETURN gt and formatting begins The H DISC LED will flash rapidly with Formatting XXX displayed where XXX is the sector number After formatting is completed the disc is verified automatically A message indicates either verified OK or lists errors found on the disc The screen then displays the message PRESSING THE SPACE BAR WILL CAUSE THE SOAK TEST TO END AT THE END OF THAT CYCLE To quit the soak test press the space bar the test will end after a few minutes The screen then displays the message new map only LARGE FILE ALLOCATION UNIT 1024 Press lt RETURN gt to enter the default value given The main A400 test menu is then displayed 28 Fault finding information A 4001 amp R140 Service Manual OR Press N lt
5. System description A40011 amp R140 Service Manual Read ROM high ROM low Write Hex address 3FFFFFF ical to Physical dress Translator 3800000 DMA Address Generators 3600000 Video Controller 3400000 Input Output Controllers 3000000 Physically Mapped RAM 2000000 Logically Mapped RAM 0000000 Non lOC devices IOC is mapped to control devices in the upper half of the VO space The lower half of the I O space may be used by other devices which are not mapped through or timed by the IOC Such devices normally MEMC expansion cards share the same handshaking contro lines to the MEMC as does the IOC The advantage of devices in this class are that they are not tied to one of the four possible OC cycle types System memory map The system memory map is defined by the MEMC and is shown in the diagram above Note that all system components including VO devices are memory mapped The sound system The sound system is based on the VIDC stereo sound hardware External analogue anti alias filters are used which are optimised for a 20 kHz sample rate The high quality sound output is available at a 3 5mm stereo jack socket at the rear of the machine which will directly drive personal stereo headphones or alternatively an amplifier and speakers A mono mix of the sound output is sent to the internal loudspeaker In addition an unfiltered stereo signal is available at the Auxil
6. Type the filename to use followed by lt RETURN gt 3 Select Q to return to the Dealer Test menu and select the Quit to desktop option 5 Fault finding Information 33 A4001 amp R140 Service Manual Keyboard test Introduction This test should be carried out whenever you repair or replace either a 300 or a 400 Series keyboard The test checks that the keys are open and functioning the LEDs are functioning the mouse buttons are functioning Equipment required In order to carry out the tests you will require the following equipment Keyboard to be tested Mouse to be tested A known good keyboard A known good mouse Computer Known good mouse 3 5 inch test disc part number 0283 090 which is write protected i Monochrome monitor OR Analogue RGB monitor Connecting up the equipment It is important to connect the equipment to the computer in the correct order Connect the mouse to test to the keyboard known good keyboard to the front panel connector monochrome monitor to the Mono Video socket OR analogue RGB monitor to the Analogue RGB socket monitor to the mains supply computer to the mains supply Running the test The tests alter the contents of the battery backed RAM that holds the computer s configuration data These must be saved before any of the tests are run and restored when the last test is over 1 Insert the test disc
7. gt 1 4 V per cell If the NVM IC29 consistently fails on the same data bits change the device If the clock fails to run or runs inaccurately check and if necessary replace X3 TP2 allows access to the clock signal Audio Loudspeaker test and Headphones test Test the audio with both headphones and internal speaker Do not forget to issue SPEAKER ON and VOLUME 127 commands If only the speaker fails check connections to the main PCB via PL8 and check IC12 pin 5 for a signal of 3 V amplitude lf no signal is present on pin 5 but can be found on pin 3 change 1C12 If there is no audio at all first check for 5 V on both ends of L10 If this is open circuit check the condition of C48 before replacement Check for 5 V on IC 11 pin 11 and R49 and R43 Check for about 3 V on VIDC IC 8 pin 12 A low amplitude signal should be found on VIDC IC 8 pins 13 14 15 and 16 If not change VIDC These signals can be traced through the peripheral circuitry and out to Q12 and Q14 The signal amplitude at these points should be about 1 5 V peak to peak PCB fault diagnosis and repair Service Manual Check for short or open circuit on signals SNDAK and SNDRQ on VIDC IC 8 pins 9 and 24 Monitor Screen If the display breaks up around its edges and spurious characters appear then investigate the system oscillator Check IC 1 and X1 Check DRAM using the test ROMs see Test ROMs With a full white screen VIDC
8. 16 OS sp ES hy Sd ico ni LDR ro rl re PICCO CS pin hign 28 ni LORB ro rs nB W pin hign LORB ro r5 inB W pin hign LDRB ro rs inB W pin nigh MCV rl amp FE0000 i STR rl r7 i set CO MOV r amp FDO000 STR gk r set CL MOV rl 66 FBOOOG STR rl rj set C2 MOV r amp 6F70000 D gt OE STR Ed r 1 set C3 MOV rl SEFCOOC STR rl c set C MOV 11 amp DF0000 STR rl 77 set C5 MOV rl MH FFOOOO STR rl r reset all LDR rl amp 55555599 write to printer port STR rl r8 SUBS r9 r9 41 BNE startl B main 46 PCB fault diagnosis and repair 4001 amp R140 Repairs following functional testing The following notes refer to the functional test procedures described in the previous chapter and give component level diagnosis and repair information following a test failure Unless otherwise stated always perform the simple checks given in the chapter entitled Fault finding information first then refer to the relevant component level information below Type Model Memory area fault Run the Memory Test see Test ROMs above and repair as necessary Memory Repair as above Battery backed RAM If the NVM suffers data retention problems and the RTC fails then with the computer power off check for about 2 8 V on IC29 pin 8 If this voltage is not present inspect PL10 D16 and the charge state of the batteries
9. Overall depth 406 mm Colour Two tone cream warm grey Finish Fine texture Materials Painted metal ABS flame retardant to meet IEC950 Keyboard Dimensions Overall height 46 mm excluding feet Overall width 485 mm Overall depth 205 mm Colour Cream case with warm grey keys in two shades Finish Fine texture Case material Keystrip holder Weight ABS flame retardant to meet IEC950 Clear plastic flame retardant to meet IEC 950 8 1 Kg Optional equipment Econet interface Plug in Econet module fits onto main PCB Econet 5 pin DIN socket fitted as standard may be fitted with blanking plug prior to upgrade Expansion cards Up to four expansion cards can be fitted Without an Econet module the machine can have up to four single or two double width expansion cards fitted These are mechanically identical to single or double Eurocards The expansion cards are fitted side by side and or one above the other at the rear of the computer lf an Econet module is fitted a half width only expansion card or one designed to fit around an Econet module such as the I O expansion card can be fitted in the lower position 400 1 systems can be fitted with any of the four categories of expansion card simple MEMC External and in slot 2 only a co A400 1 amp R140 processor expansion card Expansion cards available and planned for the Archimedes system include ROM expansion card AKA05 providing a capabil
10. from the background The whole test card is surrounded by a contrasting border The purpose of the cards is to display 16 shades with the shade of the border as the middle of the range You should observe the 16 shades displayed the mid coloured border the quality of the grey scale display the integrity of each test card This is a subjective test so make a note of any faults which you detect and when you are ready to continue press the Space Bar Colours incorrect or missing With a full white screen VIDC 1C 8 pins 39 40 and 41 should all have the same signal on them If not either change the main PCB or see the chapter entitled PCB fault diagnosis and repair High resolution mono monitor The high resolution monitor tests begin with the following display 32 Service Manual High resolution monitor tests Check for linearity and a clean noise free display on high resolution monitor Ensure Hi res and standard RGB monitors are at least 500mm apart Run the Hi res tests Y N Press Y to continue A series of displays follows with messages to check for linearity Press SPACE to move on to the next test Floppy disc drive The Floppy disc drive test consists of two parts The first part of the test checks the write protect mechanism The test disc must be write protected for this test to work If the disc drive passes the following message is displayed FLOPPY DISC DRIVE TESTS PASSED
11. into its serviceable modules in order to carry out basic checks and replace modules found to be faulty The main unit houses the main PCB the PSU the cooling fan the hard disc drive and 3 5 floppy disc drive The keyboard mouse and monitor are separate units See the appropriate third party service information for the monitor The mouse is a service replacement only item Removing the top cover 1 Switch off and disconnect the computer from the mains supply and the disconnect all peripherals including the keyboard 2 Place the main unit with the rear panel facing you on a work surface with a clean soft covering 3 Remove the top cover e Remove the two screws in the sides of the top cover immediately behind the front moulding e Remove the three screws along the top of the rear panel and remove the top cover by sliding it off from the rear of the unit Removing the main PCB Unplug the following cables from the main PCB Speaker LED connector PL8 Battery connector PL10 Fan connector PL12 Four power tags PL11 yellow 12V PL5 black OV PL6 red 5V and PL7 mauve 5V Note If a hard disc drive is fitted proceed through steps 2 to 7 and partially withdraw the main PCB until the fan connector is accessible SK10 SK11 2 Unplug the fioppy disc drive cable from SK9 on the main PCB 3 Unplug and remove any expansion cards fitted see the section entitled
12. software is designed for use on a machine which is at Fault finding Information Asoo amp R140 least working ensure that the machine passes the basic checks for a dead computer before proceeding further with these tests 13H the number IS the same press the Space Bar to continue The next display is the first menu of the test disc Dealer Test Menu A300 A400 Tests Podules and Upgrades Load Save CMOS RAM 2 W N Keyboard Test SELECT OPTION Select the option A300 400 Tests The software will have determined the correct machine type from the previous test automatically The next menu is therefore displayed for A400 1 series machines A300 A400 Test Menu Other Tests 1 Hard Disc Formatter A400 s only 2 Hard Disc Verifier A400 s only 3 Hard Disc Soak Test A400 s only 4 Copy HFORM A400 s only 9 Hard Disc Park A400 s only 6 7 Return to main menu SELECT OPTION Select the test required For all tests other than the hard disc drive see the section entitled Other Tests later in this chapter Fault finding information Service Manual Hard disc drive tests The hard disc drive tests should be carried out after you have repaired or replaced the main PCB or when you have repaired or replaced a hard disc drive These tests enable you to check the formatting and operation of a hard disc and its interface WARNING Running these tests on a hard disc will destroy ali the data curr
13. switch on the rear of the machine 5 Switch OFF the power to thg rest of the equipment Dual floppy dise test Introduction The Dual floppy dist 168 Sf60l8 Ta rrlad d t whenever you install Papali r replace a setnd floppy disc Note These instructions ewim the second floppy disc drive u Wr kira as ENT been correctly installed Please r Upgrading in the appendices if voll ati al n Tor i installation or removal Equipment required in order to carry out the tests you will require the following equipment Second floppy disc drive upgrade to be tested which should be fitted already Computer Keyboard 3 5 inch test disc which is write protected test disc 1 e ADFS 800k formatted write enabled 3 5 inch disc test disc 2 monochrome monitor OR analogue RGB monitor Connecting up the equipment It is important to connect the equipment to the computer in the correct order Connect the keyboard to the front panel connector monochrome monitor to the Mono Video socket OR analogue RGB monitor to the Analogue RGB socket monitor to the mains supply computer to the mains supply Running the test If you have not already done so follow Running the tests in the introduction to the Expansion tests above 1 Select option 5 Dual floppy disc test The program loads and displays the following DUAL FLOPPY DISC DRIVE TEST Insert Test Disc 1 in Drive O
14. 0277 033 ACCESSORIES TRAY 0483 000 WELCOME GUIDE 0483 001 BASIC GUIDE 0483 002 USER GUIDE 0870 353 POWER LEAD 13A1EC Supplied as a set only comprising 0277 029 SIDE CHEEK LH 0277 030 SIDE CHEEK RH Parts list 63 a00 1 amp R140 Service Manual Keyboard Assembly feto gt on cme 0276 101 CASE LOWER 0276 102 CASE UPPER 0177 100 KEYBOARD PCB ASSY 0276 106 NAME LABEL 0277 107 LOGO LABEL 0276 103 LEG MOULDING 0276 104 WINDOW MOULDING 0276 105 FRICTION PAD FOR ABOVE 0276 108 RESET SWITCH CAP MOULDING 0483 029 BASIC KEY CARD 0890 011 RUBBER FOOT 0999 784 CURLY CABLE 64 Parts list Upgrading Introduction The Archimedes 400 1 series and R140 computers may be upgraded with all the expansion cards already made available by Acorn for the Archimedes 300 and 440 series Notes on these upgrades are included in the Archimedes 300 and 440 Service Manuals New upgrades available for the 400 1 series and R140 computers includes SCSI interface Ethernet and Floating Point Co processor expansion cards New expansion card installation instructions included in this manual cover the fitment of all expansion cards while specific installation instructions for the Floating Point Co processor provides the additional information required for this card Also included are new installation instructions for a second floppy disc drive kit specific to the 400 1 series Information on MEMCI
15. A400 1 amp R140 Service Manual Copyright Acorn Computers Limited 1989 Neither the whole nor any part of the information contained in nor the product described in this manual may be adapted or reproduced in any material form except with the prior written approval of Acorn Computers Limited The products described in this manual are subject to continuous development and improvement All information of a technical nature and particulars of the products and their use including the information and particulars in this manual are given by Acorn Computers Limited in good faith However Acorn Computers Limited cannot accept any liability for any loss or damage arising from the use of ar y information or narticulars in this manual or any incorrect use of the products All maintenance and service on the products must be carried out by Acorn Computers authorised dealers or Approved Service Centres Acorn Computers Limited can accept no liability whatsoever for any loss or damage caused by service maintenance or repair by unauthorised personnel All correspondence should be addressed to Customer Services Acorn Computers Limited Fulbourn Road Cherry Hinton Cambridge CB1 4JN Information can also be obtained from the Acorn Support Information Database SID This is an on line viewdata system available to registered SID users Initially access SID on Cambridge 0223 243642 this will allow you to inspect the system and use a response fram
16. If the data printed is incorrect check the continuity of the data lines into and out of IC 7 though R 33 to R 41 47 L aoo amp R140 Service Manual and onto SK 3 If both the printer and the floppy disc drive fail change IC 43 Keyboard and mouse Check computer interface by swapping to a known good keyboard and mouse if failure still present check continuity of keyboard connector SK 12 and ensure that 5 V can be found on pin 4 and 0 V on pin 3 Check functionality of inverting buffers in IC 15 check continuity through R 204 and R 208 Replace IOC IC 22 Expansion cards Check through System Failure tracing all signals through to the expansion card backplane If necessary replace the expansion card backplane 48 PCB fault diagnosis and repair A400 1 amp R140 Appendices Appendices Service Manual 49 A400n amp R140 Service Manual 50 Appendices a00 1 amp R140 Parts list Service Manual Items listed with part numbers are available from Acorn Computers Limited as spare parts Main PCB 0283 022 0283 023 0283 024 0283 025 0283 032 2201 365 2201 375 2201 367 RISC OS ROM 1 V2 0 RISC OS ROM 2 V2 0 RISC OS ROM 3 V2 0 RISC OS ROM 4 V2 0 PAL 0760 021 TBP IC ARM 2UM PLSTC IC MEMC 1A PLSTC IC VIDC 1A PLSTC 2201 368 IC IOC PLSTC RES ZERO R 0W25 RES 10R C MF 5 0W25 RES 100R C MF 5 0W25 RES 1K C MF 5 0W2
17. Insert Test Disc 2 in Drive 1 Then Press SPACE 2 Leave the test disc in drive 0 Insert in drive 1 an ADFS 800k write enabled disc the scratch disc Any data already on this disc may be destroyed so t is best to use a blank disc The first part of the test checks the write protect mechanism The test disc test disc 1 must be write protected for this test to work 4 The test continues with disc Read Write and Erase tests on test disc 2 Each test gives a PASSED FAILED message 5 When prompted swap the discs in the drives then press the space bar The tests in 3 and 4 above are then repeated using the opposite drives 6 When prompted replace test disc 1 in drive 0 You have now completed the Dual floppy disc test Return to the main menu and select the Quit option to finish W Fault finding Information 37 40011 amp R140 Completing the tests 1 If no further tests are to be carried out select option 5 Hard Disc Park to park the hard disc heads if fitted Then press the space bar to return to the A300 A400 test menu 2 Select option 7 to return to the main Dealer Test Menu then select option 3 Load Save CMOS RAM to re load the contents of the CMOS RAM When prompted replace the test disc with the data disc on which the CMOS RAM contents were saved Type L to load the data into RAM Type the filename to use followed by lt RETURN gt 3 Select Q to return to the Dealer Test menu and
18. Mbit ROM type EPROMS eg 270301 Links set 1 to 3 and 2 to 4 JEDEC 1 Mbit EPROMS eg 27C 101 See table on circuit diagram Not applicable By cutting track and fitting in a South position the floppy disc drive may be powered via the ribbon cable Can be used to ground RDY signal in floppy disc interface for test purposes Hard disc head select amp reduced write current select Default is LK12 East LK13 West RAM size select see table on circuit diagram Access to real time clock oscillator NF Not Fitted Service Manual Main PCB plugs Serial line Auxiliary audio connector 10 way 2 row 0 1 pitch NF For pin out see silk screen on PCB Unfiltered left channel output oV Filtered teft channel output 0 V Auxiliary input feed to internal amplifier and speaker 0 V Filtered right channel output OV Unfiltered right channel output 0 V Connection to VIDEO BNC sockets NF Internal clock selection 4 way 2 row 0 1 pitch For pinout see silk screen on PCB links fitted 1 to 2 3 to 4 CKSYS 24 MHz system clock Feed to VIDC clock Sync signal 0 V Internal Video 10 way 2 row 0 1 pitch NF VEDO inverse of red data bit 0 VED1 inverse of red data bit 1 VED2 inverse of red data bit 2 VED3 inverse of red data bit 3 SUP supremacy output control for external video mixing HI horizontal interlace marker HS horizontal sync vs vertical sync Power supply connector 12 V Pow
19. Press Y if you wish to continue If you press N the previous menu will be re displayed The program will ask which drive is to be formatted the default drive is 4 press lt RETURN gt or select 27 44001 amp R140 Service Manual another drive number followed by lt RETURN gt An attempt is then made to recognise the hard disc One of three messages will be displayed 1 If the program cannot identify the disc i it cannot be read choose the correct make from the list displayed then go to step 4 2 If the disc can be read one of the following messages appears The shape written on the disc does not match any of the standard drive shapes known by this program Do you wish to retain this shape Y N Press Y lt RETURN gt if you wish to format a disc of a type other than those listed then go to step 4 Press N lt RETURN gt if you wish to format a previously unformatted disc which is one of those listed then go to step 4 OR if the recognised format is that of tor example a 20 Mb Tandon The shape written on the disc matches that of a 20Mb Western Digital Tandon disc Do you wish to retain this shape Y N Press Y lt RETURN gt to continue The message Old or New map format 0 N N will then appear where N is the default Note O Old format must be used if you are going to perform the soak test Press lt RETURN gt N for RISC OS if you are not going to soak test the disc Dis
20. The sound system implemented on the device can support up to 8 channels each with a separate stereo position The Input Output Controller IOC controls the IO bus expansion Podules and provides basic functions such as the keyboard interface system timers interrupt masks and control registers It supports a number of different peripheral cycles and all IO accesses are memory mapped 14 The I O system The I O system is controlled by IOC and the Memory Controller The VO Bus supports all the internal peripherals and the expansion cards System architecture The I O system which includes expansion card devices consists of a 16 bit data bus BD 0 15 a buffered address bus LA 2 21 and various control and timing signals The I O data bus is independent from the main 32 bit system data bus being separated from it by bidirectional latches and buffers In this way the I O data bus can run at much slower speeds than the main system bus to cater for slower peripheral devices The latches between the two buses and hence the I O bus timing are controlled by the I O controller IOC The IOC caters for four different cycle speeds slow medium fast and synchronous A typical 1 O system with expansion cards fitted is shown in the diagram below The expansion cards are controlled by IOC and the MEMC expansion cards share the l O Controller interface with IOC For clarity the data and address buses are omitted from this diagram
21. address bus either on the DRAMs themselves or on IC 34 pins 28 to 37 7 Check for Data and Address signals on all four of the ROMs This is especially important if the ROMs have been disturbed as mis use of a screwdriver during ROM removal may have damaged or broken PCB tracks or pins on the socket 8 Check for all address lines on MC again with RESET held down 9 Check the processor interrupt lines FIQ and IRQ pins 8 and 7 on ARM IC 32 Neither of these should be stuck low IRQ can be expected to pulse low FIQ should be high These interrupts should also be checked at their source on IOC IC 22 pins 50 and 51 Should these also be low the interrupt source can be traced by examining all interrupt inputs to PCB fault diagnosis and repalr A400n amp R140 IOC IC 22 on pins 30 to 42 note that pins 30 31 and 42 are active high logic 10 Check corner pins of IOC IC22 for short circuits 11 Check for a RAS signal on pin 9 of all the DRAMS check positions of RAM size select links LK14 and LK15 Test ROMs The test ROMs are designed to assist in the repair of all Archimedes systems where Failure to Initialise faults are present ie the machine appears to be dead on power up The ROMs contain software which can be categorised in two sections 1 Main memory test routines 2 Test routines for use under repetitive reset To install the test ROMs carefully remove the RISC OS ROM set ICs 16 17 18 and 19 and rep
22. select the Quit to desktop option 5 4 Switch OFF the power to the computer at the mains switch on the rear of the machine 5 Switch OFF the power to the rest of the equipment ROM expansion card test The ROM expansion card test should be carried out whenever you install repair or replace a ROM expansion card Note These instructions assume that both the expansion card and the backplane have already been correctly installed See Upgrading in the Appendices if you need instructions for installation or removal Equipment required In order to carry out the tests you will require the following equipment ROM expansion card to be tested which should be already fitted Computer Keyboard 3 5 inch test disc which is write protected monochrome monitor OR analogue RGB monitor e ROM Expansion card test ROM Acorn Part No 0276 230 01 fitted to socket IC6 In addition the position of links LK1 6 and LK2 6 should be changed from between the middle pin and pin A to between the middle pin and pin C Connecting up the equipment It is important to connect the equipment to the computer in the correct order Connect the keyboard to the front panel connector Service Manual monochrome monitor to the Mono Video socket or analogue RGB monitor to the Analogue RGB socket monitor to the mains supply computer to the mains supply Running the test If you have not already done so foll
23. socket of the backplane labelied Podule 0 The known good MIDI expansion card must be in the lower socket of the backplane labelled Podule 2 It will therefore be necessary to rearrange the expansion cards in the computer Note the following Arecord should be made of the positions of any expansion cards already fitted so they can be replaced in their correct sockets after the test has been run Full instructions for the installation or removal of expansion cards are given in Upgrading in the Appendix Please refer to it Proceed as follows 1 Remove the top cover of the computer 2 Ensure that the backplane and its support bar are fitted correctly 3 Remove any expansion card already in the backplane socket labelled Podule 0 Fault finding information 39 440011 amp R140 Service Manual 4 Remove any expansion card already in the backplane socket labelled Podule 2 5 Install the known good MIDI expansion card in the backplane socket labelled Podule 2 6 Install the MIDI expansion card under test in the backplane socket labelled Podule 0 Connecting up the equipment It is important to connect the equipment to the computer in the correct order Connect the keyboard to the front panel connector hi res monochrome monitor to the Mono and Sync sockets OR analogue RGB monitor to the Analogue RGB socket one end of the Econet cable marked IN to th
24. to SK11 see Fig 3 i DRIVE 0 DRIVE 1 SK 11 Fig 3 Data cable details 4 300 series The new disc drive comes with a front fascia panel attached This only fascia is fitted to protect the unit in transit and is not required when the drive is installed in an Archimedes system The fascia is held in position by two clips one on each side of the drive These should be levered carefully out of position using a small screwdriver and the fascia removed Take care not to dislodge the drive eject button while removing the fascia 5 Before fitting the new drive it must be configured as drive 1 To do this set the small slide switch on the drive to position 1 see Fig 4 below The location of the slide switch will depend on the type of drive supplied with your particular kit there are two possibilities DATA amp POWER CONNECTORS TOP OF DRIVE SET FOR DRIVE 1 DRIVE SWITCH POSITIONS TYPE A TYPE B Fig 4 Configuring the new drive as drive 1 6 Assemble the drive to the drive bracket with four of the M3 x 6mm screws supplied using the original drive O assembly as a guide to orientation Don t overtighten the screws Second floppy disc drive installation 3 7 Assemble the drive bracket to the disc drive support bracket with two of the M3 x 6mm screws supplied or No 4 x 1 4 screws if untapped Leave the screws slightly loose DRIVE BRACKET FIX PLS Fig 5 Installing the new drive 8 Conn
25. 1A and RAM upgrades are given in Technical Service Bulletins numbers 1 89 and 2 89 respectively also included Upgrading 65 A 40011 8 R140 Service Manual 66 Upgrading Expansion card installation instructions for use with Archimedes and R140 computers To install an expansion card in the computer you will require an adapter called a backplane Backplanes are fitted as standard equipment on Archimedes 400 series and R140 computers and are are available separately for the Archimedes 300 series Full instructions for installing backplanes are supplied with them In order to fit the expansion card you will have to remove the lid of the computer unit and one of the blanking plates at the rear of the machine The only tools you will require for this are No 1 and No 2 Pozidriv screwdrivers If you do not feel confident about carrying out this installation take the expansion card and your Archimedes computer to your supplier who will fit the card for you A charge may be levied by the supplier for installing the expansion card such a charge shall be entirely at the discretion of the supplier concerned Disassembly 1 Switch off the computer at the rear and disconnect it from the mains supply by unplugging the power supply cable Unplug any peripherals that are attached and remove them from the computer completely 2 Locate the screws holding the top case in place see Fig 1 below Remove the three screws at the top re
26. 5 RES 10K C MF 5 0W25 RES 100K C MF 5 0W25 RES 1K2 C MF 5 OW25 RES 150R _ C MF 5 0W25 RES 1K5 C MF 5 0W25 RES 180R C MF 5 0W25 RES 1K8 C MF 5 0W25 RES 22R C MF 5 0W25 RES 220R C MF 5 OW25 RES 2K2 C MF 5 0W25 RES 22K C MF 5 0W25 RES 270R _ C MF 5 0W25 RES 33R C MF 5 0W25 RES 330R C MF 5 0W25 1016 IC17 1C18 IC19 1C84 1C32 1034 1C8 1022 R114 115 116 117 R103 R156 158 204 205 R68 128 134 200 210 R13 19 27 73 206 207 R129 193 R132 135 148 149 157 R1 2 28 199 R31 R32 155 542 133 R33 34 35 36 37 40 41 42 R6 22 24 71 194 208 R38 88 89 R12 152 209 R29 R20 21 53 79 150 151 R52 154 e em Pants list 51 A400 1 amp R140 52 43 44 45 46 47 48 52 53 55 94 65 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 87 89 91 92 Part No Description Qty Component number RES 3K9 C MF 5 OW25 1 R86 RES 33K C MF 5 0W25 7 R56 57 61 62 63 111 213 RES 390R C MF 5 OW25 1 R213 RES 47R C MF 5 0W25 1 R201 RES 470R C MF 5 0W25 2 R30 82 RES 4K7 C MF 5 0W25 28 R4 5 23 25 64 65 66 67 118 124 126 127 130 137 153 159 160 196 211 212 214 215 216 RES 56R C MF 5 0W25 4 R59 60 77 78 RES 68R C MF 5 0W25 62 R7 TO 11 74 75 76 80 81 83 84 90 TO 104 105 106 112 113 136 138 140 142 145 146 161 TO 192 195 203 RES 680
27. CB RES 10K C MF 5 0W25 Parts list 57 400 1 amp R140 Service Manual 410 1 Lower Case Assembly Part No Description Qty Component number 6 0176 005 DISC DRIVE CABLE ASSY 7 0176 009 BATTERY HOLDER ASSY 8 0176 010 FAN ASSEMBLY 1 9 10 0276 004_ REAR MOULDING 1 11 0276 007 BOTTOM METALWORK 1 12 0276 010 L H BUSBAR 1 13 0276 011 R H BUSBAR 1 14 0276 012 BLANKING PANEL 2 15 16 0276 026 BACKPLANE SUPPORT BAR 1 17 0276 033 FAN FILTER CLAMP 1 18 0276 034 FAN FILTER 1 19 0276 037 PCB SIDE SLIDE GUIDE 2 29 0183 002 55W 240V PSU 1 30 0183 004 3 5 X 1 1MB FLOPPY DISC DRIVE 1 31 0183 007 VIDEO BNC CABLE ASSY 1 32 0183 009 PCB EARTH CABLE ASSY 1 33 0183 040 SYNC BNC CABLE ASSY 1 34 0183 040 4 WAY BACKPLANE 1 39 0283 013 1 FLOPPY DRIVE BRACKET RH 1 0283 016 DRIVE SADDLE 1 CABLE TIE 1 SCREW M2 5 X 10 PAN HD POSI 6 SCREW M3 X 6 PAN HD POSI 12 SCREW M4 X 35 PAN HD POSI 4 SCREW NO 4 X 1 4 PAN HD POSI 2 SCREW NO4 X 3 8 PLS PAN POS 6 NUT M4 STL FULL 7 0882 949 SPIRE CLIP O 6 3 WASHER M2 5 PLN STL 6 WASHER M4 SPRF IT STL 1 WASHER M3 SPRF IT STL 6 58 Parts list A 4001 amp R140 Service Manual Description Component number RIVET POP 3 2D DOR D RIVET POP 3 2D X 4 4T MAT SPACER NYLON 8MM PCB SCREW NO 6 X 3 8 PAN POSI 0887 012 SPACER PLASTIC HEX 19 05MM 0890 009 FOOT POP FIT 4MMH Parts list 59
28. CT153 CMOS 16 0 3 1 1C45 L C 74HCT573 CMOS 20 0 3 2 1C 13 20 I C 74AC02 CMOS 24 0 3 1 1033 C 74AC04 CMOS 14 0 3 1 1C1 l C 74AC11 CMOS 14 0 3 1 1027 l C 74AC245 CMOS 20 0 3 2 IC25 26 LC 74ACT574 CMOS 1 1C36 l C LM324 QUAD OP AMP 1 1011 LC LM368 AUDIO AMP 1 IC12 TRANS BC239 NPN 6 Q3 10 12 14 16 17 TRANS 2N3904 NPN 1 Q1 TRANS 2N3906 NPN 9 Q2 4 5 6 8 9 11 13 15 54 Parts list Q7 1 D15 16 D1 D14 0780 496 TRANS BF496 NPN DIODE SI IN4005 600V 1A DIODE SI IN4148 0794 005 0794 148 SK4 PL4 X2 LK2 5 6 8 X2 LK1 7 X2 12 13 14 15 PL2 X2 PL2 X2 4 X2 LK1 7 X2 8 X2 12 13 14 15 1C84 IC16 17 18 19 IC65 IC8 22 34 1032 IC49 51 53 55 57 59 61 63 67 82 CONR 5W SKT DIN RA PCB CONA 2W WAFR 0 1 ST PCB CONA 3W WAFR 0 1 ST PCB CONR 5W WAFR 0 1 ST PCB CONR 2W SHUNT 0 1 0800 913 0800 050 0800 051 0800 052 0800 070 SKT 1 C 20 0 3 NORM SKT 1 C 32 0 6 SUPA SKT 1 C 48 0 6 NORM SKT 1 C 68P PLCC SKT 1 C 84P PLCC SKT 1 C 20W ZIP SUPA 0800 120 0800 132 0800 148 0800 169 0800 185 0800 195 FSTN TAB 6 3MM x 0 8MM ST PCB 0800 203 PLS 6 7 11 POWER GND SK7 EXPANSION PL10 BATTERY FRONT PANEL CONR 96W SKT ST ABC PCB CONR 2W WAFR 0 1 ST LK CONR 6W WAFR 0 1 ST LK CO
29. GB socket monitors to the mains supply computer to the mains supply Running the tests The tests alter the contents of the battery backed RAM that holds the computer s configuration data These must be saved before any of the tests are run and restored when the last test is over 1 insert the test disc into the floppy disc drive 2 l your screen is showing the desktop environment press function key f12 for the RISC OS supervisor prompt 3 At the RISC OS supervisor prompt type the following DRIVE 0 lt RETURN gt CMOSLS lt RETURN gt 4 Type S to save the contents of the RAM 5 When prompted replace the test disc with an ADFS D formatted 800k write enabled disc the data disc 6 Type the filename to use followed by lt RETURN gt 7 When prompted remove the data disc and put it in a safe place Do NOT use this disc for the later floppy disc test 26 8 Type Q to quit this option 9 Switch off the computer ONLY leave the monitor ON 10Press and hold down the DELETE key NOT the BACKSPACE key and switch on the computer Keep holding down the DELETE key until a momentary red border around the screen confirms that a DELETE power up is taking place This action clears the CMOS RAM and resets the configuration defaults to the manufacturer s original specification 11 The Desktop environment will now appear Insert the test disc into the floppy drive drive 0 Press and hold down the CTRL SHIFT and ke
30. IC 8 pins 39 40 and 41 should all have the same signal on them If not change the VIDC IC 8 Trace each signal through the periphery circuitry and out to SK1 until the fault is found Unstable or scrolling display The computer may have lost its configuration value for SYNC Type at the keyboard CON SYNC 1 RETURN press RESET and see if any change occurs Check for CSYNC signal on SK1 pin 4 lf not present trace back through LK1 R10 and IC 9 finally changing VIDC IC 8 Floppy disc drive Make sure that the configuration items STEP and FLOPPIES are correctly set Check that the disc drive 1D selection switch is in the required position usually 0 Swap the disc drive for a known good drive and cable If this also fails check the power supply connection for 12 V 5 V and O V see Upgrading Serial port If a fault is reported but the test is passed see the Serial Port Application Note in the Archimedes 440 Service Manual for possible explanations noting that the 440 1 serial port is now based on the RS232 standard and the patch RS423 Drive version 1 24 is no longer required Check for 5 V on IC 6 pin 8 and R 13 to R 16 Check for the clock on IC 23 pins 6 and 7 change X2 if faulty f OK change ICs 5 and 6 Printer If the printer fails completely check for a STROBE signal on SK 3 pin 1 trace back through R 42 Q 10 and R 68 to IC 43 Also check for shorts or open circuits on PACK and PBSY
31. INUE You should Check that the number displayed on the screen is the same as on the label on the front of the computer If the number is NOT the same or correct for the upgrades fitted check inside the machine for the amount of RAM fitted If the test is giving the wrong result there is a fault in the memory areas See also Running the tests under Main PCB functional test for full details The next display is the first menu of the test disc Dealer Test Menu 1 A300 A400 Tests 2 Podules and Upgrades 3 Load Save CMOS RAM 4 Keyboard Test SELECT OPTION Swap the known good keyboard for the keyboard and mouse to be tested then select option 4 Keyboard Test Fault finding information 40 1 amp R140 Service Manual Keys stuck During this test any keys or mouse buttons which are in a permanently closed position ie stuck down are displayed on the screen If any keys are permanently closed then it will be IMPOSSIBLE to continue the test If everything is normal and no keys are stuck then nothing is displayed on the screen and the test program passes straight on to the next test LEDs This test checks that the LEDs on Caps Lock Scroll Lock and Num Lock are working To carry out this test 1 Follow the instructions which appear on the screen These tell you when to check that each LED is ON and OFF 2 Note down any LED failures before continuing the test 3 After each set o
32. NR 5W SKT HSNG 0 1 PBC CONR 17W SKT HSNG 1 PCB 0800 408 0800 458 0800 469 0800 481 SK6 NET MODULE SK5 NET MODULE 0800 484 CONR 3W 3 5MM RA PCB JSKT CONR 2W WAFR 0 156 ST LK SKT 6W MINDIN RA PCB RFI 0800 642 SK2 AUDIO PL12 FAN SK12 KEYBOARD 0800 853 0800 919 SK8 10 HARD DISC SK9 11 HARD amp FLOPPY CONR 20W BO3 IDC LP ST CONA 34W BOX IDC LP ST 0803 100 0803 102 0815 305 FUSE 2A LBC AX PCB FS1 X2 X4 X3 X1 XTAL 1 8432 MHZ HC 18 XTAL 10 00MHZ HC 18 XTAL 32 768KHZ CC 0 05 XTAL 96MHZ 5 O T HC 18 0820 019 0820 100 0821 327 0820 961 ue Parts list 55 Aor amp R140 Service Manual Part No Description Qty Component number 0860 005 COIL RF 33uH AX Q 45 1 L10 0860 012 CHOKE RF 2u2H AX Q 45 1 L9 0860 014 CHOKE RF OU 8H 1 LB 0860 015 CHOKE RF FE BEAD 13 11 7 12 17 0800 291 CONR 9W PLG RA PCB LK LK 1 PL1 SERIAL 0800 292 CONR 9W SKT RA PCB LK LK 1 SK1 VIDEO 243 0800 293 CONR 25W SKT RA PCB LK LK 1 SK3 PRINTER 56 Parts list 40071 amp R140 Service Manual 400 1 series Backplane Assembly Description Component number 0283 041 IC PAL 0760 003 TBP CPCTR 220U ALEC 16V 20 CPCTR DCPLR 33 47N 0 2 IC 74HC 139 CMOS 16 0 3 FSTN TAB 6 3 X 0 8 ST PCB CONR 64W SKT ST AC PCB SH CONR 96W SKT ST ABC PCB CONR 96W PLG RA ABC P
33. R C MF 5 0W25 2 R48 72 RES 82R C MF 5 0W25 1 R47 RES 820R C MF 5 OW25 4 R85 87 197 198 RES 43R2 MF1 0W25E9 3 R26 46 51 RES 332R MF 1 0W25 E96 3 R55 69 70 RES 1K00 MF 1 0W25 E96 5 R107 108 109 110 202 RES 150K MF 1 0W25 E98 8 R95 TO 102 RES 100R MF 1 0w25 E94 2 R45 49 RES NET 220 330R SIL 8P 1 RP2 RES NET 1KO TF 10 9P 1 RP1 RES NET 10K SIL 9P 2 RP3 4 CPCTR TANT 10U 10V 20 15 C1 3 25 48 70 B1 10 CPCTR CPLT 10N 30V 80 1 C71 CPCTR CPLT 1N 30V 10 3 C4 5 6 CPCTR CPLT 2N2 30V 10 8 C7 TO 14 CPCTR CPLT 2N7 30V 10 2 C19 22 CPCTR GPLT 12P30V 2 3 C17 18 52 CPCTR CPLT 22P 30V 2 1 C16 CPCTR CPLT 33P 30V 2 1 C50 55 Parts list A400 1 amp R140 0701 772 0704 118 0706 552 0708 455 0708 583 0709 463 0721 198 0732 630 0732 631 0732 632 0740 006 Service Manual Description Qty CPCTR CPLT 47P 30V 2 CPCTR CPLT 100P 30V 2 CPCTR CPLT 330P 30V 2 CPCTR ALEC 47U 10V AX CPCTR ALEC 47U 16V RAD CPCTR ALEC 220U 16V RAD CPCTR ALEC 470U 10V RAD CPCTR ALEC 10U 16V RAD CPCTR ALEC 100U 25V RAD CPCTR CER 47N 30V 80 CPCTR MPSTR 1N0 63V 10 CPCTR MPSTR 1U0 50V 10 CPCTR MPSTR 100N SOV 10 CPCTR MPSTR 22N 50V 10 CPCTR MPSTR 33N 50V 20 CPCTR MPSTR 68N 50V 10 CPCTR DCPLA 33 47N AX 12V CPCTR DCPLR 100N AX 25V IC 1772 FDC 28 0 6 IC 514256 DRAM 256Kx4 IC 65051 IC 8455 DATA SYNC 20 0 3 IC PCF8583 1 C 63463 HDC 48 0 6 LC DLY 50
34. RETURN gt to format and verify only The screen then displays the message Are you certain you want to format drive 4 Y N Type Y lt RETURN gt and formatting begins The H DISC LED will flash rapidly with Formatting XXX displayed where xxx is the sector number After formatting is completed the disc is verified automatically A message indicates either verified OK or lists errors found on the disc The screen then displays the message new map only LARGE FILE ALLOCATION UNIT 1024 Press lt RETURN gt to enter the default value given At the end of the verifying procedure the main A300 A400 test menu is displayed Hard disc verifier Select option 2 Hard Disc Verifier from the A300 A400 Test Menu A message appears HARD DISC VERIFIER V1 02 DEALER WARNING Please ensure that a hard disc has been fitted to this machine Please DO NOT continue with the test if the hard disc has not been fitted Continue Y N If you press N the previous menu wiil be re displayed Press Y to continue The following is displayed VERIFY DRIVE 4 OR 5 4 Either press lt RETURN gt for the default drive number 4 or enter the hard disc drive number followed by lt RETURN gt The message VERIFYING will appear and the H DISC LED will flash on and off A message is then given indicating either VERIFIED OK Press space bar to continue Press the space bar to return to the A300 A400 Test Menu OR lis
35. RS OVER TAB ON BOARD CONNECTOR BARB INSERT WITH fr BARB AT TOP Fig 7 Removing inserting LED wires in the LED speaker connector 12 Offer up the new dual drive sub moulding to the main moulding passing the LED wires through the drive 1 aperture Ensure that the top edge of the sub moulding fits into the slot between the rib and the top edge of the main moulding then secure the sub moulding using the two self tapping screws previously removed Do not overtighten Second floppy disc drive installation 5 13 Insert the LED wire contacts into the LED speaker connector so that the barbs on the contacts engage in the slots in the connector housing see Fig 7 step 3 Observe correct polarity make sure that the red and black wires arc the correct way round as shown in Fig 7 step 2 14 15 16 17 18 19 20 21 22 23 24 25 26 300 series Insert a disc into both drives to aid alignment of the disc eject only buttons through the apertures in the front moulding Offer up the front moulding assembly to the main unit ensuring that the LED speaker cables pass around the side of the new drive 1 and that the main circuit board locates in the slots in the front moulding Do not force the moulding Insert the front moulding assembly fixing screws and fully tighten them 300 series Check that both drives will accept and reject discs that the eject only buttons do not bind on the mouldi
36. S 5783 Remove the main PCB Remove the cover of the computer Remove the front moulding assembly Unplug the backplane Disconnect the main PCB power connectors The full disassembly procedure is given in the 400 1 Service Manual insert the ICs 1 Remove the ICs from their packaging 2 Check that all pins on the ICs are straight If any appear crooked or splayed you will need to realign them use a pin aligning tool 3 Locate the area of the board where the memory is fitted A diagram of this area is shown in Figure 1 If you are upgrading from 1Mb to 2Mb the new ICs will be interleaved with the existing soldered memory chips If you are upgrading from 2Mb to 4Mb the new ICs will be fitted into the upper row of empty sockets 4 Fit the ICs with the bevelled edge facing towards the back of the computer Front of computer 1Mb already soldered O txis i O 114 Insert upgrade ICs into spaces Fill these sockets to upgrade to 4Mb Figure 1 Memory banks and links Technical Service Bulletin 2 89 400 1 RAM Upgrade 10f2 A Archimedes Change the link settings The link settings on LK14 and LK15 see Figure 1 need to be changed so that the computer can make use of the new memory Figure 2 shows the settings of the links Figure 2 Link settings On a computer with 1Mb of memory both links are set to position B If you have upgraded to 2Mb then set link LK15 to position B and LK14 t
37. SCREW 6 32UNC X 1 4 PAN POSI SCREW NO 6 X 3 8 PAN POSI 0887 012 SPACER PLASTIC HEX 19 05 MM 0890 009 FOOT POP FIT 4MMH 0177 001 20 MB H DISC DRIVE 420 1 0912012 50 MB H DISC DRIVE 440 1 amp R140 A EA E A nS Parts list 61 A 400 1 amp R140 Service Manual Final Assembly Items Descriptlon Component number 0276 002_ FRONT MOULDING 0276 006 TOP METALWORK 0276 017 BASE LABEL 0276 038 NO ECONET LABEL SPEAKER LED ASSEMBLY 0283 015 410 1 FRONT LANEL 0283 215 420 1 FRONT LABEL 0283 315 440 1 FRONT LABEL 0283 003 1 FRONT SUB MOULDING BATT ALKALINE 1V5 2AH AA SCREW M3 X 6 PAN HD POSI SCREW NO 6 X 3 8 PAN POSI SCREW NO 6X 1 2 PAN POSI 0882 949 SPIRE CLIP NO 6 Supplied as a set only comprising 0276 006 TOP METALWORK 0276 007 BOTTOM METALWORK 0176 009 BATTERY HOLDER ASSY 0283 016 DRIVE SADDLE _ Supplied as a set only comprising 0276 004 REAR MOULDING 0276 002 FRONT MOULDING n _ m tm l_m mm _ T_rr _ _ m _ _ _ _ _ mm r _ _ _ ttk 62 Parts list A 40011 amp R140 Service Manual Miscellaneous items Description Component number 0176 003 MOUSE 0283 109 DISC 1 410 1 0283 020 DISC 2 410 1 0283 027 UTILS DISC 1 0277 019 CARTON 0277 029 SIDE CHEEK LH 0277 030 SIDE CHEEK RH 0277 031 KEYBOARD END CHEEKS
38. This computer is an co ARCHIMEDES nnn CHECK FRONT LABELS THEN PRESS lt SPACE gt TO CONTINUE Fault finding information A 4001 amp R140 Service Manual You should Check that the number displayed on the screen is the same as on the label on the front of the computer Ifthe number is NOT the same or correct for the upgrades fitted check inside the machine for the amount of RAM fitted If the test is giving the wrong result there is a fault in the memory areas The next display is the first menu of the test disc Dealer Test Menu 1 A300 A400 Tests 2 Podules and Upgrades 3 Load Save CMOS RAM 4 Keyboard Test SELECT OPTION Select option 2 Podules and Upgrades then proceed to the relevant card information below Completing the tests 1 If no further tests are to be carried out select option 5 Hard Disc Park to park the hard disc heads if fitted Then press the space bar to return to the A300 A400 test menu 2 select option 7 to return to the main Dealer Test Menu then select option 3 Load Save CMOS RAM to re load the contents of the CMOS RAM When prompted replace the test disc with the data disc on which the GMOS RAM contents were saved E Type L to load the tita into RAM Type the filename to s tof wed by lt RETURN gt 3 Select Qto return ta the Dealer 1 Test menu and select the Quit to desktop c option 5 4 Switch OFF the power to the computer at the mains
39. Write Protect Insert Test disc 2 in drive 0 Then press SPACE Replace the test disc with a BLANK ADFS D formatted 800k write enabled disc The test continues with disc Read Write and Erase tests Each test gives a PASSED FAILED message Action If test fails check that the configuration for STEP and FLOPPIES is correct Check the disc drive ID switch is set to the correct position normally 0 for single floppy drive 1 for second floppy drive Swap the cable and drive for known good examples Check power to drive lf fault persists either change the main PCB or see the chapter entitled PCB fault diagnosis and repair Serial port The RS423 port test is carried out automatically and gives a PASSED FAILED message Action If test fails make sure that the configuration items BAUD and DATA are set to sensible values see the User Guide If test still fails after you have ensured that the loopback plug is functional on another unit either change the main PCB see the chapter entitled PCB fault diagnosis and repair If option 1 Other Tests Except Printer was selected on the A300 A400 test menu the following is then displayed PRINTER NOT TESTED PRESS lt SPACE gt TO CONTINUE See the section entitled Completing the tests Fault finding information A400 1 amp R140 Service Manual Printer The Printer test sends a test pattern to the printer The pattern comprises a repe
40. adphone note down the fault Action if test fails If no sound or poor faulty sound on known good headphones change the main PCB or see the chapter entitled PCB fault diagnosis and repair 4 To continue with the test press the Space Bar 31 A 400 1 amp R140 Standard colour monitor This test consists of a series of screen displays You proceed through the test at your own pace The first display consists of a series of white lines radiating from the top left corner A cursor in the shape of a three coloured bird travels across the screen starting from the bottom left and finishing at the top right The features to check are the accuracy of the lines the movement and integrity of the cursor the transparency of the bird image as it moves across the lines This is a subjective test so make a note of any faults When you have finished looking at the screen display press the Space Bar to move to the next display The next screen displays consist of four test cards There is a test card for each of the three colour guns and a grey scale to test the three guns The four test cards are Red scale Green scale Blue scale Grey scale Press the space bar to step through the colours Each test card consists of 16 concentric circles beneath a horizontal band which is divided into 16 sections A pale border highlights the leftmost eight sections of the band in order to distinguish the band
41. and a small flat bladed electrical screwdriver Please read through the following instructions carefully before you start If you do not feel confident about carrying out this installation take this upgrade and your Archimedes computer to your supplier who will fit it for you A charge may be levied by the supplier for installing the upgrade such a charge shall be entirely at the discretion of the supplier concerned Please take care while fitting this upgrade the disc drive unit and cable assembly are delicate Any damage caused while fitting this upgrade is unlikely to be covered by the guarantee Parts list In the upgrade package you should have e One 3 5 Disc Drive e One dual disc drive cable assembly e One drive bracket e One dual disc drive sub moulding assembly Model number labels for the front panel e Six M3 x 6 mm pan head screws and two No 4 x 1 4 pan head screws or four M3 x 6mm pan head screws and two No 4 x 1 4 pan head screws e Serial number label Disassembly 1 Switch off the computer at the rear and unplug the power supply cable from the mains socket Disconnect the monitor and any peripherals which may be attached and remove them from the computer completely 2 Locate the screws holding the top case in place see Fig 1 overleaf Remove the three screws at the top rear of the unit then remove the single screw located on each side of the unit towards the front Second floppy disc drive i
42. ar of the unit then remove the single screw located on each side of the unit towards the front TOR COVER TOP COVER FIX Fig 1 The screws holding the top case 3 Once you have removed the three rear screws and the two side screws slide the lid of the unit to the rear of the machine then remove it completely Slightly spring the sides of the lid outwards if necessary to make it easier to slide 4 Check that a backplane is fitted to the computer The backplane consists of a small printed circuit board mounted vertically on the main PCB If the backplane is not fitted then you will have to purchase one and install it according to the instructions which are supplied with the backplane before you can continue with Expansion card installation 1 the installation of the expansion card The standard backplane fitted to the Archimedes 400 serics and the R140 can take up to four single width or two double width expansion cards The optional backplane fitted to the Archimedes 300 series can take up to two single width or two double width expansion cards If the backplane is fitted but has no expansion card socket free you will have to remove one of the expansion cards in order to install a new one The backplane has upper and lower expansion card slots These correspond to the two full width blanking plates fitted to an unexpanded machine Each blanking plate is held in place by screws one at each end Choose the expansion card slot
43. ards a vertical position until the faces of the interlocking connectors on the expansion card and backplane are touching Expansion card installation 3 3 Retighten the two screws slackened earlier If you do not require the two spacers simply secure the expansion card to the rear of the computer case by inserting a screw at each end of the expansion card backplate Reassembly 1 Once the expansion card has been correctly installed slide the top case of the computer unit on from the rear make sure you slide it on the right way round the three notches for the fixing screws go at the back of the computer 2 Replace the three screws at the rear of the unit and tighten them up See Fig 1 3 Finally replace the two screws one on each side of the case Scc Fig 1 The expansion card is now installed Sce the documentation accompanying the particular expansion card you have fitted for information on the use of the card Copyright Acorn Computers Limited 1989 Published by Acorn Computers Limited January 1989 Part number 0476 201 Issue 3 Expansion card installation 4 WE32206 Floating Point Co processor Installation and operation guide for use with Acorn R140 and Archimedes 440 and 400 1 series computers Introduction The WE32206 floating point co processor is a high speed hardware processor for floating point instructions Compiled programs which currently use the software floating point emulator will be able to use the co pr
44. ated series of stepped lines each representing bits 0 to 7 You should look for missing or corrupted pattern As this is a subjective test make a note of any faults that you detect At the end of the printer test a list of failures if any is displayed Action If the test fails with a known good printer and cable connected check the configuration settings for PRINTER and IGNORE are correct if fault still persists either change the main PCB or see the chapter entitled PCB fault diagnosis and repair The printouts should look like this TEST COMPLETE COMPLETE PRINTER TEST COMPLETE The display then shows Insert Dealer Test Disc 1 Then press SPACE Replace the test disc and press the space bar A final banner displays either PASSED in green or FAIL in red if any non subjective tests are failed followed by TESTS COMPLETE PRESS lt SPACE gt TO CONTINUE Press the space bar to return to the A300 A400 Test Menu Completing the tests 1 If no further tests are to be carried out select option 5 Hard Disc Park to park the hard disc heads if fitted Then press the space bar to return to the A300 A400 test menu 2 Select option 7 to return to the main Dealer Test Menu then select option 3 Load Save CMOS RAM to re load the contents of the CMOS RAM When prompted replace the test disc with the data disc on which the CMOS RAM contents were saved Type L to load the data into RAM
45. backplane support metalwork to the base metalwork and power supply 2 Supporting the expansion card ease the backplane towards a vertical position until the faces of the interlocking connectors on the expansion card and backplane are touching 3 Tighten the two backplane support screws If you do not require the two spacers secure the card to the rear of the computer case by inserting a screw at each end of the card backplate Reassembling the computer 1 Once the card has been correctly installed slide the cover of the computer unit on from the rear make sure you slide it on the right way round the lip for the three fixing screws should be at the back of the computer 2 Replace the three screws at the rear of the unit and tighten them up See Figure 1 3 Finally replace the two screws one on each side of the case Sec Figure 1 The co processor card is now installed and you are ready to install the software Installing the RISC OS software support code There are two relocatable modules supplied on the support disc called FPEmulator and FP280 There is also a simple test program called FPTest The FPEmulator file is a replacement module that supports both hardware assisted and software only floating point arithmetic it replaces the existing FPEmulator file The FP280 file is the latest version of the original module that provides software only floating point support it is included for reference only 4 WE32206 Floating Poin
46. c sockets AND OR analogue RGB monitor from the Analogue RGB socket headphones from the Headphones 320hms socket printer from the Parallel Printer port serial port loopback plug from the RS423 socket Keyboard from the front panel connector Fault finding information Packing After servicing repack the Archimedes computer in its box To avoid damage do NOT send the computer through the post or by courier unless it is in its original packaging 25 Aa00 1 amp R140 Service Manual Main PCB functional test Setting up Equipment required Computer with PCB to be tested Keyboard known to be working 3 5 inch test disc part number 0283 090 write protected e Two ADFS 800k formatted write enabled 3 5 inch discs serial port loopback plug Epson FX80 or Olivetti JP 101 printer pair of 320hm stereo headphones high resolution monochrome monitor analogue RGB monitor Note You can replace the specified printers with any other manufacturer s direct functional equivalent in terms of BOTH hardware interface and software Connecting up the equipment Connect the keyboard to the front panel connector serial port loopback plug to the RS423 socket printer to the Parallel Printer port headphones to the Headphones 320hm socket hi res monochrome monitor to the Mono amp Sync sockets analogue RGB monitor to the Analogue R
47. c format values are then requested Note 1 Where the disc tormat is for one of the drives listed in the program default values are supplied by the program and should be used as in the example for a 20Mb Tandon below Note 2 If the disc has been read but not recognised as having a standard drive shape selecting the Y option to retain the shape will display the values read from the disc After each request either press lt RETURN gt to enter the default value given or enter the new value followed by lt RETURN gt Sectors per track 232 Heads 4 Cylinders 615 Low current cylinder 21023 Precompensation cylinder 21023 Parking cylinder 2663 The following is then displayed Current Defects Cylinder Head Sector Defects may be listed here A no more changes B add defect by cylinder head byte sector C add defect by disc address eg discerror D remove defect If defects are listed the hard disc is formatted Check that the defects listed included all those on the label on the hard disc unit so skip steps 1 and 2 which are described below and proceed to step 3 If no defects are displayed eg the hard disc is unformatted or the list does not include all the defects listed on the label on the drive Type B to enter defect values or C to enter as disc error information see label on drive Note that option C can also be used to enter ADFS error addresses to mark out known drive defects
48. ckplane at right angles to it and that you align the connectors otherwise you may bend the pins or break or disconnect the backplane itself lt does not require great force to install the co processor card correctly If the card does not fit into the socket correctly remove it and try again When you have fitted an expansion card to your computer the backplane should generally be in a vertical position assuming that the card is fully inserted and screwed into the rear of the computer For some combinations of machines and cards however the top of the backplane may appear to lean towards the front of the machine If this is the case you should insert the two spacers found in this package Each spacer should be inserted between the internal face of the expansion card backplate and the metal clips on the rear plastic moulding of the machine so that the fixing screws pass through both the backplate and the spacers see Figure 3 This should result in the external face of the expansion card backplate panel being flush with the rear plastic moulding WE32206 Floating Point Co processor 3 WASHER REAR PANEL OF SPACER EXPANSION CARD Figure 3 Fitting spacers to the expansion card backplate Straightening the backplane When you have fitted the co processor card you may need to straighten the backplane to ensure that the connectors are correctly mated To do this take the following steps 1 Slacken off the two screws fixing the
49. copy the hard disc formatter program HFORM onto the hard disc Copying HFORM onto the hard disc Select option 4 on the A300 A440 Test Menu This program will create a directory called LIBRARY on the hard disc copy the file HFORM into it The following is displayed on completion Copy HFORM V1 00 DEALER HFORM copied Press space bar to return to menu Completing the tests You have now completed the hard disc tests 1 If no further tests are to be carried out select option 5 Hard Disc Park to park the hard disc heads Then press the space bar to return to the A300 A400 test menu 2 select option 7 to return to the main Dealer Test Menu then select option 3 Load Save CMOS RAM to re load the contents of the CMOS RAM When prompted replace the test disc with the data disc on which the CMOS RAM contents were saved Type L to load the data into RAM Type the filename to use followed by lt RETURN gt 3 Select Q to return to the Dealer Test menu and select the Quit to desktop option 5 Fault finding information A400 amp R140 Other tests If you have not done so already follow the sequence under Running the tests above to save the contents of the CMOS RAM and reset default values At the Dealer Test Menu select option 1 A300 A400 Tests Select the version of Other Tests required select option 1 if no printer is connected or option 2 or 3 for the printer in use Ensure that the pr
50. d on the screen and the defects file on the hard disc is updated automatically You can remove the floppy test disc while the Soak test is running but you should not subject the computer to any mechanical shock or movement e turn off the computer unless the test has terminated ie the PASSED FAILED message is displayed and you have copied HFORM onto the hard disc 29 A400 1 amp R140 Service Manual During the Soak test the following information is displayed on the screen Acorn Computers Winchester Soak and Test WIST Version 2 13 Dealer 21 June 1989 DFS NoRetries Q to quit Elapsed time Test ends in Type Read Write Format Verify Write Serial Number Data Pattern Precompensation Cylinder Working on track Reduced Write Current Cylinder Seek errors Heads Re reads Required Cylinders Reformats required Park Cylinder Logued Defects In the lower half of the screen there are four columns in which the cylinder head and sector defects are listed as they are discovered Any defects which the manufacturer or previous tests have logged on the drive are listed at the top of the left hand column If any defects are detected If any defects are detected during the Soak test the figures for the Seek errors Re reads required Reformats required and Logged defects are highlighted in red However the fact that new defects are discovered does not necessarily mean that the Soak test wiil fail You do n
51. d free from restraints Remove the fan then remove the f ur M3 x 6 mm fixing screws from the underside of the base metalwork Slide the PSU forward to clear the rear moulding then lift it clear When installing a PSU the system should be tested for satistactory earth continuity in accordance with IEC 950 Note The PSU is a service replacement only item DANGER WHEN REFITTING OR FITTING A REPLACEMENT ASSEMBLY CHECKS SHOULD BE MADE FOR EARTH CONTINUITY BETWEEN THE EARTH PIN OF THE MAINS PLUG AND THE FOLLOWING THE BASE METALWORK THE REAR PANELS INCLUDING BLANKING PANELS THE TOP COVER USE AN EARTH CONTINUITY TESTER SET TO 25 AMPS Front moulding assembly 1 First remove the top cover as detailed above 2 Remove the two screws securing the front moulding assembly at each side 3 Stand the unit on one side and remove the three screws securing the front moulding assembly to the base metalwork Disassembly and assembly 400 1 amp R140 Service Manual 4 Stand the unit back on its feet and unplug the LED speaker connector PL8 from the main board 5 Grasp the front moulding assembly at each end and use a straight steady pull to withdraw it from the front of the unit For access to the indicator LEDs locate and remove the two self tapping screws at each end inside the main front moulding and slide the sub moulding away from the main moulding Fan assembly 1 First remove the
52. dware and execute all floating point instructions by software emulation alone and reloading the FPEmulator file will reactivate the hardware co processor Possible problem areas Many application programs originally written to run under the Arthur operating system have boot sequences and or earlier copies of the FPEmulator module which do not support the hardware co processor built into their discs The RISCOS approach of providing common resources in a System application directory is by far the tidiest way of resolving this problem but if you wish to keep such application discs operating exactly as before then you will have to replace the floating point emulator file usually called FPEmulator or FPE with the FPEmulator file from the support disc supplied with the co processor Also be aware that versions of the software only emulator prior to version 2 6 do not disable the hardware which could give rise to a most undesirable clash in operation Checking the co processor Included on the support disc is a program which performs a limited series of tests on the co processor To run it simply type FPTest or double click on the FPTest icon from the desktop Note that the program requires a minimum of 776k of RAM 1Mb machine owners will need to quit the desktop and reduce configured RAM allocations to small or zero settings while 420 1 440 and 440 1 desktop users will nced to drag the NEXT RAM allocation beyond 776k or quit t
53. e IN socket of the uppermost MIDI expansion card under test AND the other end of this cable to the OUT1 socket of the lower known good MIDI expansion card one end of the Econet cable marked O P to the IN socket of the lower known good MIDI expansion card monitor to the mains supply computer to the mains supply Note At this stage the cable marked O P is only connected at one end You will be prompted to connect the other end as necessary Running the test If you have not already done so follow Running the tests in the introduction to the Expansion card tests above Select option 3 MIDI Podule 1 Once the test program is loaded and the first part of the test has been run the screen displays the following ARCHIMEDES MIDI PODULE TEST c Acorn Computers Ltd Version 1 00 Podule ROM test Passed IN socket test Passed Connect O P lead to THRU then press SPACE 2 Plug the free end of the cable marked O P into the THRU socket of the uppermost MIDI expansion card under test Press the space bar to start the test A PASSED or FAILED message appears 3 When prompted move the cable from the THRU socket to the OUT1 socket then press the space bar A PASSED or FAILED message again appears 40 4 When prompted move the cable from the OUT1 socket to the OUT2 socket then press the space bar APASSED or FAILED message again appears 5 Afinal messa
54. e FIFOs before using it Data is requested in blocks of four 32 bit words allowing efficient use of paged mode DRAM without locking the system data bus for long periods MEMC supports Direct Memory Access DMA operations with a set of programmabie DMA Address Generators which provide a circular buffer for Video data a linear buffer for Cursor data and a double buffer for Sound data The Video Controller VIDC takes video data from memory under DMA control serialises it and passes it through a colour look up palette and converts it to analogue signals for driving the CRT guns VIDC also controls all the display timing parameters and controls the position and pattern of the cursor sprite In MEMC VO Address Bus 13 A400 1 amp R140 Service Manual addition it incorporates an exponential Digital to Analogue Converter DAC and stereo image table for the generation of high quality sound from data in the DRAM The VIDC is a highly programmable device offering a very wide choice of display formats The colour look up palette which drives the three on chip DACs is 13 bits wide offering a choice from 4096 colours or an external video source The cursor sprite is 32 pixels wide and any number of rasters high Three simultaneous colours again from a choice of 4096 are supported and any pixel can be defined as transparent making possible cursors of many shapes It can be positioned anywhere on the screen
55. e for registration ACORN ARCHIMEDES and ECONET are trademarks of Acorn Computers Limited IBM is a trademark of International Business Machines Corporation Within this publication the term BBC is used as an abbreviation for British Broadcasting Corporation First published July 1989 Published by Acorn Computers Technical Publications Department Part number 0483 075 Issue 1 A400 amp R140 Service Manual A4007 amp R140 Service Manual Contents About this manual Technical specification Computer main unit Connectors Dimensions Optional equipment Environmental Electrical safety Operating system Screen modes Packaging and installation System description Introduction General The I O system The sound system Hard disc drives and interface Disassembly and assembly Introduction Removing the top cover Removing the main PCB Floppy disc drive Power supply unit Front moulding assembly Fan assembly Main unit assembly Keyboard Mouse Fault finding information Contents Introduction Checking a dead computer Functional testing General test procedure Main PCB functional test Hard disc drive tests Other tests Keyboard test Expansion tests A 400 1 amp R140 Service Manual Backplane tests 41 Main PCB fault diagnosis and repair 43 Tools required 43 Repairing a dead computer 43 Test ROMs 44 Repairs following functional testing 47 Keyboard a
56. ect the centre connector on the disc drive power cable and the end connector on the disc drive data cable to the new drive 9 Taking the front moulding assembly locate and remove the two self tapping screws at each end inside the main moulding and slide the sub moulding away from the main moulding see Fig 6 INSIDE FRONT MOULDING 300 400 SERIES XA Il om AL AFFIX LABEL HERE DUAL DRIVE ENSURE EJECT BUTTON SUB MOULDING CLEARS MOULDING 300 400 SERIES Fig 6a Front moulding assembly details 300 400 series 4 Second floppy disc drive installation INSIDE FRONT MOULDING 400 1 SERIES AFFIX LABEL HERE NEW DRIVE 1 DUAL DRIVE ENSURE DRIVE FACIA SUB MOULDING CLEARS MOULDING 4001 SERIES Fig 6b Front moulding assembly details 400 1 series 10 The leads from the speaker in the main moulding and the LED in the sub moulding share the same connector The new dual drive sub moulding has an LED already fitted to it You will need to remove the existing leads from the connector and replace them with those from the new LED as follows 11 Using a small electrical screwdriver or similar depress the barbs on the LED wire contacts in the LED speaker connector red and black wires and withdraw the contacts from the connector noting the polarity of the LED wires see Fig 7 steps 1 and 2 Place the old front sub moulding to one side 1 PRESS TO RELEASE BARB WITHDRAW FROM HOUSING BLACK LOCATE LOCKING EA
57. ement that anti static precautions should be utilised at al levels of servicing ie antistatic matting and wrist straps Repairing a dead computer See Checking a dead computer under Fault finding Information for initial tests These notes are a guide to diagnosing and repairing faults on the main PCB resulting from the initial tests Video failure 1 Check tor 5 V on both ends of L9 if open circuit then check C1 for short circuit Also check for 3 5 Volts approx on IC 8 pin 43 Should this not be present then check R73 D13 and C27 Check for a 24 MHz clock on IC 8 pin 19 lf missing then check continuity to and through P14a and its shunt Check for video data on IC 8 pins 39 40 and 41 If not present check power supply to IC 8 if present before finally changing IC 8 Check for short circuits on signals VIDRQ and VIDAK Check connection of all data lines to VIDC N q a System Failure In order to eliminate the major devices first change in turn the ARM IC 32 MEMC IC 34 IOC IC 22 and VIDC IC 8 Re try the system after each device change lf the system still appears to be dead proceed as follows 1 Check for main system clock of 24 MHz on LK3 centre position If absent check again on IC 2 pin 6 if still absent check for Z 96 MHz this will look like a sine wave of small amplitude if a high quality oscilloscope is not used on IC2 Pin 3 Change IC2 if 96 MHz is present If not try changi
58. ently held on the disc Ensure that users are aware of this and that they give you their consent before you start Hard disc formatter Note Unless otherwise stated the formatter enters the default value for you after a request to enter a value Unless you wish to change the default value just press lt RETURN gt If the 12 hour soak test is used the hard disc MUST be formatted using the old map Then when the soak test is complete the drive should be reformatted with the new map If the soak test is performed with a new map format any new defects will not be recorded properly and the defects list will be corrupted Always reformat the disc to the new map AFTER you have finished the soak test If you have not done so already follow the sequence under Running the tests above to save the contents of the CMOS RAM and reset default values At the Dealer Test Menu select option 1 A300 A400 Tests Now select option 1 Hard Disc Formatter A400 s only The following is displayed HARD DISC FORMATTER V1 01 DEALER WARNING Running this test on a hard disc that has data on it will DESTROY ALL DATA currently held on the disc Please ensure that users are aware of this and give you their consent before you start Please ensure that a hard disc drive has been fitted to this machine Please DO NOT continue with the test if the hard disc has not been fitted or you do not have the users consent Continue Y N
59. er Fault finding information Testing the backplane The backplane PCB should be electrically tested using a Suitable continuity isolation analyser and wire harness to suit Note Due to the presence of an active device no pin on any connector may be subjected to a voltage greater than 300mV with respect to any other pin on any other connector Replacing the backplane 1 2 3 Replace the backplane in the computer Replace the expansion cards removed at the start of the test in their original sockets Replace the top cover of the computer by sliding the top cover on from the back of the computer then doing up the five retaining screws 41 A40011 8 R140 Service Manual AAAA aeee eee DD et 42 Fault finding Information A4001 amp R140 Service Manual Main PCB fault diagnosis and repair This section deals with fault diagnosis and repair of the main PCB at component leval See the chapter entitled Fault finding information for basic fault diagnosis before proceeding to this chapter Tools required The suggested tools for servicing Archimedes 400 1 series machines is as follows e 100 MHz oscilloscope DC voltmeter Earth continuity tester Acorn test disc part no 0283 090 Serial Port Loopback Headphones 32 Ohm impedance Chip extraction tools 68 84 pin Standard items such as soldering desoldering workstation screwdrivers pliers etc It is a recommended requir
60. er supply connector O V Power supply connector 5 V Power supply connector 5 V Front panel connector pins 1 to 4 fitted only Speaker connection 0 V 1 2 3 Power on LED connection 4 0 V Auxiliary VO connector NF OV Aux 2 Aux 1 C4 Bidirectional IO line NVM alarm signal Battery connection Fan connection A400 1 amp R140 68 Service Manual 4001 amp R140 Technical Service Bulletins Technical Service Bulletins Service Manual 69 A400 1 amp R140 Service Manual 70 Technical Service Bulletins A Archimedes Technical Service Bulletin 2 89 400 1 RAM Upgrade Note This upgrade should only be Installed by an Acorn Approved Service Centre contact your suppller for detalis If this Instruction Is disregarded the guarantee on either this upgrade or the computer or both may be Invalidated Applicable models Archimedes 410 1 Archimedes 420 1 Purpose To install a 1Mb RAM upgrade kit in an Archimedes 400 1 series computer One or three kits may be installed in a 410 1 to upgrade the RAM to 2Mb or 4Mb respectively Two kits may be installed in a 420 1 to give 4Mb of RAM Note There is no 3Mb memory option and you cannot install more than 4Mb of memory Parts required One or more 400 1 RAM upgrade kits AKA 52 Fitting the kit Disassemble the computer WARNING TAKE ALL PRECAUTIONS REGARDING STATIC ELECTRICITY AND EARTHING IN ACCORDANCE WITH B
61. expansion card slot number two Looking from the back this is the lower left hand slot labelled podule 2 If there is an expansion card already in this slot remove the card When you have fitted the co processor you can replace the card in an alternative slot Other expansion card types can be placed in any other available slot 6 If necessary remove the blanking plate for slot number two by unscrewing the two screws one located at each end of the plate You can now fit the co processor card 2 WE32206 Floating Point Co processor Fitting the co processor card 1 As the backplate on the co processor card does not extend the full width of the machine you are supplied with a half width blanking plate along with a T piece and two screws If you do not have another expansion card in the slot next to the co processor make the backplate of the co processor card up to the full width of the machine using the half width blanking plate Once you have made the backplate up to the correct width you can install it into the computer Figure 2 Fitting a co processor card 2 To fit the co processor card support the backplane firmly with one hand and push the connector on the card into the co processor socket labelled podule 2 on the backplane sec Figure 2 The connector should be securely seated i e the backplate of the card should be flush with the rear of the computer case lt is important that you offer the card up to the ba
62. f instructions press the BREAK key to move to the next instruction Mouse This tests the three buttons on the mouse and the movement of the mouse to the left right up and down Each of the mouse buttons ie left middle right are displayed on the screen in turn together with a pointer You should 1 Move the mouse until the pointer is within the displayed button on the screen 2 Press the corresponding mouse button The button displayed on the screen should disappear and the next button appear Note If you accidentally press two buttons together you will see both buttons displayed on the screen You should press the BREAK key to continue If the button cannot be made to disappear then it will be IMPOSSIBLE to continue the test You should repeat the test with the known good mouse to isolate the fault to either the keyboard or the mouse Replace faulty components then retest If everything is normal the program moves on automatically to the next test Keys The screen clears to show a representation of keys in the main keyboard area You need to test each key in turn in the correct order ie work from the bottom line of the keyboard and from left of the keyboard to the right 1 Press CapsLock 2 Check that the picture of theCaps Lock key disappears from the screen Leave a small delay before pressing the next key 3 Press Shift and check that the picture of the Shift key disappears from the screen Fault finding i
63. f the tests are run and restored when the last test is over 1 Insert the test disc into the floppy disc drive 2 If your screen is showing the desktop environment press function key f12 for the RISC OS supervisor prompt 3 Atthe RISC OS supervisor prompt type the following DRIVE 0 lt RETURN gt CMOSLS lt RETURN gt 4 Type S to save the contents of the RAM 5 When prompted replace the test disc with an ADFS D formatted 800k write enabled disc the data disc 6 Type the filename to use followed by lt RETURN gt 7 When prompted remove the data disc and put it ina safe place Do NOT use this disc for the later floppy disc test Type Q to quit this option 9 Switch off the computer ONLY leave the monitor ON 10Press and hold down the DELETE key NOT the BACKSPACE key and switch on the computer Keep holding down the DELETE key until a a momentary red border around the screen confirms that a DELETE power up is taking place This action clears the CMOS RAM and resets the configuration defaults to the manufacturer s original specification 11 The Desktop environment will now appear Insert the test disc into the floppy drive drive 0 Press and hold down the CTRL SHIFT and T keys then press and release the BREAK key Release the remaining keys 12 The first test is the computer type model test This test is extremely fast and the type and model number of the computer is displayed immediately
64. fault memory size is 8100000 bytes 1Mb however this may be cycled through 0 5 1 2 and 4Mb memory sizes by pressing the M key When using the ROMs on a machine having memory content other than 1Mb the video display may at first appear out of line or incorrect in this instance press the M key repeatedly until the required memory size has been selected The memory test is cyclic and on completion of each full memory test a full stop will be displayed The 4Mb test takes about 29 seconds tf for some reason the video display is completely blank or unreadable eg because of a video fault a printed output may be obtained by selecting option 1 the output being produced at the printer port as well as on the VDU If an error is found in the memory the display will show AT ADDRESS amp nnnnnnnn WROTE amp pppppppp READ XXXXXXXXXXXXXXXXXXXXXXXX XXX XX XXX where nnnn is the faulty address pppp is the data written to that address and xxxxxxxx is the data read back from that address in binary form The memory tests do not terminate unless an error is found in which case after reporting 8 or 9 errors the test will torminate An additional check is now made on the state of CMOS RAM control lines CO and C1 lf either of these lines are short circuit to 0 Volts the test ROMs will indicate this on power up Repetitive reset test This section of test code is intended for use when the main memory test menu fails t
65. from the Command line type CONFIGURE FLOPPIES 2 Reset the computer hold down Ctrl and press RESET and you should be able to access either floppy drive Refer to the User Guide for further guidance If you have problems with the new drive contact your supplier Keep the old front moulding and drive cable assemblies in case you decide to upgrade further to a hard disc system at a later date Copyright O Acorn Computers Limited 1989 Published by Acorn Computers Limited January 1989 Part number 0483 062 Issue 1 Second floppy disc drive installation 7 Second floppy disc drive installation A400 amp R140 Main PCB links and test points Archimedes model 400 1 link options and test points North selects SK1 pin 4 to be HSYNC South selects SK 1 pin 4 to be CSYNC default is link fitted South No link fitted selects SK 1 pin 5 to be a mode control AMODE Link fitted selects SK1 pin 5 to be VSYNC Default is no link fitted Not applicable Not applicable No link selects Hi Res Sync Link fitted for Low Res Monochrome via Sync BNC socket Default is no link No link selects Hi Res Sync Link fitted Low Res Monochrome via Sync BNC socket Default is no link Selects ROM size for ICs 16 to 19 Default selection is for 512K 1M devices See table on circuit diagram for other sizes Selects type of EPROMs ROMs DEFAULT Links set 1 to 2 and 3 to 4 for EPROMS up to 0 5 Mbit 1 Mbit ROMs and 1
66. g together with test equipment as listed in the introduction to this chapter The Archimedes computer keyboard mouse backplane expansion cards test disc ADFS 800k formatted disc serial port loopback plug Port Tester assembly and Econet cables are designed and specified by Acorn Computers Ltd and may not be changed without written consent from Acorn All items should be complete with the correct cables so that you can connect them to the Archimedes computer Removing the top cover of the computer unit Remove the top cover of the Archimedes computer as detailed in the previous chapter Disassembly and Assembly Safety Some of these tests require that you remove the top cover of the Archimedes computer Although the power supply unit is designed to comply with BS5850 24 Class 1 you must still take care to ensure that no metal objects fall or are put into the power supply unit through the ventilation holes Connecting and disconnecting the power e You must CONNECT the power ONLY when you have made all the other connections You must DISCONNECT the power BEFORE removing any other connections Validating the test equipment Before carrying out any of the tests in this section validate the test equipment using a known good unit If the test equipment fails you should repair the test equipment and retest on a known good unit Before you start Before the start of each day or testing session you must first
67. ge appears telling you whether the MIDI expansion card has passed or failed You have now completed the MIDI expansion card test See Completing the tests in the introduction to the Expansion tests Fault finding information 44001 amp R140 Service Manual Backplane tests Introduction The backplane should be tested if you suspect it is faulty Likely symptoms of this are All installed expansion cards fail their tests Expansion cards fail their test only if installed in a specific siot A known good expansion card fails a test but then passes the same test on another computer Equipment required In order to carry out the tests you will require the following equipment 4 way backplane e Continuity solation tester Removing the backplane The backplane must be removed for testing Note the following A record should be made of the positions of any expansion cards already fitted so they can be replaced in their correct sockets after the test has been run e Full instructions for the installation or removal of expansion cards and of the backplane are given in Upgrading in the Appendices Proceed as follows 1 Remove the top cover of the computer 2 Ensure that the backplane and its support bar are fitted correctly 3 Ensure that all expansion cards are fitted correctly 4 If no fault was visible remove all expansion cards from the backplane 5 Remove the backplane from the comput
68. he desktop before running If the co processor is running correctly the test program should display Floating Point tests completed If the test fails check that enough RAM space has been allocated a stack overflow error is a symptom of insufficient space Check also that the installation has bcen carried out correctly If problems persist contact your supplicr After running the test hold down Ctrl and press the RESET button to clear the computer RISC X software support code installation There is no separate RISCiX software to install After installing the co processor card boot RISCiX and you should sce a start up message confirming the existence of the co processor 6 WE32206 Floating Point Co processor WE32206 Floating Point Co processor Copyright O Acorn Computers Limited 1989 Published by Acorn Computers Limited Part number 0473 961 Issue 3 July 1989 WE32206 Floating Point Co processor Second floppy disc drive installation instructions For use with Archimedes 300 and 400 1 series computers These instructions describe how to install a second floppy disc drive in Archimedes 300 and 400 1 computer systems Note that different drive units are fitted to 300 and 400 1 series machines check that you have the right kit for your computer before proceeding In order to fit the upgrade you will have to remove the cover of the computer unit The only tools you will require are a No 1 Pozidriv screwdriver
69. he drive the HDC Hard Disc Controller will check the READY line before proceeding with the required function A failure of this signal or the SEEK COMPLETE signal may result in a polling action ie repeated attempts to select by the HDC All control signals on the 34 way bus from a hard disc unit will only be active when the drive is selected If a seek is required before selecting the read write head then the direction signal DIR will be set high or low to indicate movement in or out and the requisite number of step pulses transmitted on the STEP control line The HDC must then wait for the SEEK COMPLETE SC signal to be returned from the drive unit As previously mentioned the HDC may go into a polling action while waiting for this signal All control signals to the drive are buffered by the 7406 IC39 and all signals from the drive are buffered by a 74HCT14 inverting Schmitt trigger IC38 Demultiplexing and buffering of the direction DIR step and reduced write current RE WC signals is achieved by a 7438 IC40 Read data path Read data is received from the drive as a differential signal and applied to the differential receiver 26LS32 IC44 From here it passes through a multiplexer 74HC51 1C47 this circuit can control two hard disc drives and onto the data separator circuit Data separator The data from the hard disc drive takes the form of a stream of pulses whose position with respect to a clock signal defi
70. iary Audio connector on the main board System description Hard disc drive and interface All functions of the hard disc drive are controlled by the Hitachi HD63463 hard disc Controller chip IC65 Reference should be made to the manufacturer s data sheet for further details of the controller chip function Host CPU connection This device is connected to the system CPU by means of the 16 bit VO bus It is memory mapped from address amp 032D0000 to amp 032D0028 The only unusual feature of this circuit is the use of an address line for the HD63463 read write line This is necessary to allow the host CPU to simulate DMA cycles during which this line reverses its function Reset is provided by the host system as is the 8 MHz clock from which all host communication signal timing is derived ST506 hard disc interface The connection to the hard disc drive is an implementation of the standard ST506 interface Drive contro signals are provided on a 34 way bus which may be daisy chained for up to four hard disc drive units and data is transferred on a separate 20 way cable for each drive in the system 15 A400 1 amp R140 Service Manual Before any data transfer can take place between the hard disc drive and the HD63463 the correct drive and correct read write head in that drive must be selected This is achieved by two drive select lines and three head select lines all buffered by a 7406 IC39 Having selected t
71. ine IC46 which is a 50 nS 5 tap device This gives three identical versions of the write data stream separated in time by 10 nS These three signals are fed to a multiplexer 74HCT153 IC45 which selects the appropriate version of the write data stream when manipulated by the write precompensation control lines EARLY and LATE Finally the data is passed through a differential driver 26LS31 1028 before going on to the hard disc drive itself Format Data is stored in the form of sectors There are 32 sectors on each track and 4 tracks in each cylinder A sector has an ID identity field and a DATA field The ID field contains the sector s number and the DATA field contains the data stored in that sector Before data can be written to the data field of a sector the correct sector must be located by repeated reading of ID fields on the track until the required sector is found System description A 4001 amp R140 Service Manual Disassembly and assembly DANGER BEFORE REMOVING THE TOP COVER ENSURE THAT THE COMPUTER SYSTEM HAS BEEN SWITCHED OFF AND THE MAINS PLUG REMOVED FROM THE SUPPLY REMOVING THE TOP COVER GIVES ACCESS TO THE POWER SUPPLY ALTHOUGH THE POWER SUPPLY IS DESIGNED TO COMPLY WITH BS5850 CLASS 1 YOU MUST STILL TAKE CARE TO ENSURE THAT NO METAL OBJECTS FALL OR ARE PUT INTO THE POWER SUPPLY UNIT THROUGH THE VENTILATION HOLES Introduction This chapter tells you how to break down the computer
72. inter is known to be working correctly After selecting and loading the required test program the computer cycles through a series of tests Memory test The first test checks the memory The screen clears and displays the following Memory test Phase one Incrementing pattern Phase two Cycling bits If the test is passed All seems OK is displayed and the program moves on to the next test If the test fails the Other tests routine will be aborted Battery backed RAM The test continues by testing battery backed RAM The following message is displayed on the screen Battery Backed Ram BBR test running Press lt SHIFT gt to scroll Reading BBR into main memory Checking read write function of BBR Re loading configuration parameters PASSED FAILED message PRESS lt SPACE gt TO CONTINUE Press the Space Bar to continue the test Action if test fails Check batteries battery holders and connections Re run the test If test still fails either change the main PCB or see the chapter entitled PCB fault diagnosis and repair Time The functional test continues by testing the time and date settings A series of options are displayed on the screen Fault finding Information Service Manual DO YOU WANT TO 1 CHECK THE DATE AND TIME 2 SET THE DATE AND TIME 3 CHECK THEN SET THE DATE AND TIME PRESS 1 OR 2 OR 3 The normal procedure is to select option 1 If you want t
73. into the floppy disc drive 2 If your screen is showing the desktop environment press function key F12 for the RISC OS supervisor prompt 3 At the RISC OS supervisor prompt type the following DRIVE 0 lt RETURN gt CMOSLS lt RETURN gt 4 Type S to save the contents of the RAM 5 When prompted replace the test disc with an ADFS D formatted 800k write enabled disc the data disc 6 Type the filename to use followed by lt RETURN gt 7 When prompted remove the data disc and put it in a safe place Do NOT use this disc for the later floppy disc test 8 Type Q to quit this option 9 Switch off the computer ONLY leave the monitor ON 10Press and hold down the DELETE key NOT the BACKSPACE key and switch on the computer Keep holding down the DELETE key until a momentary red border around the screen confirms that a DELETE power up is taking place This action clears the CMOS RAM and resets the configuration defaults to the manufacturer s original specification 11 The Desktop environment will now appear Insert the test disc into the floppy drive drive 0 Press and hold down the CTRL SHIFT and keys then press and release the BREAK key Release the remaining keys 12The first test is the computer type model test This test is extremely fast and the type and model number of the computer is displayed immediately This computer is an ARCHIMEDES nnn CHECK FRONT LABELS THEN PRESS lt SPACE gt TO CONT
74. ity for plug in ROM based software YO expansion card AKA10 This reproduces the BBC Model B Master Series A to D port User Port and 1 MHz bus Midi expansion card AKA16 This provides a MIDI control interface with music synthesisers A MIDI module AKA15 which can be added to an VO expansion card is also available SCSI Floating point and Ethernet expansion cards are also available now or likely to become so in the near future Contact Acorn Customer Service for details of new expansion cards available Environmental Operating Temperature 5 to 35 C Humidity 10 to 95 at 35 C non condensing Altitude 0 to 2500 metres above sea level 40 to 70 C Storage Temperature Humidity 10 to 95 RH non condensing Altitude Up to 10 000 metres Electrical safety Designed manufactured and tested to comply with the EEC Low Voltage Directive When fitted with PSU intended for 220 240 V operation BS415 IEC 65 BS5850 IEC 380 Service Manual Operating system The RISC OS Operating System is described in detail in the RISC OS Programmer s Reference Manual Screen modes Twenty eight screen modes are supported The first eight modes provide compatibility with the BBC Microcomputer 6502 based range MOS Pixel Resolution 640 x 256 320 x 256 160 x 256 TEXT ONLY 320 x 256 160 x 256 TEXT ONLY TELETEXT TELETEXT 640 x 256 4 320 x 256 16 160 x 256 256 TEXT ONLY 640 x 256 16 320
75. l 1 TO 8 40 OSCLI Channelvoice STR channel STR 2 50 NEXT 60 FOR channel 1 to 8 70 SOUND channel 15 100 24 80 PRINTchannel 90 k GET 100 NEXT RUN PROGRAM PRESS A KEY AND REPEAT 8 TIMES PRINTS CHANNEL NUMBERON SCREEN AND PLAYS VOICE 2 FOR EACH CHANNEL Fault finding information 23 40011 amp R140 Service Manual Functional testing Tha following information gives details of how to isolate faults to individual modules using the Acorn Test Disc part no 0283 090 on machines which are working but exhibiting faults The tests included on the disc for the 400 1 series are as follows e Main PCB functional test Hard disc drive tests Other tests Keyboard test Expansion tests Note 1 Please read the following section General test procedure before you carry out any of the tests Note 2 All 400 1 series computers have a hard disc interface fitted as standard on the main board In addition models 420 440 and R140 have a hard disc drive fitted as standard The Hard Disc Upgrade test listed in the Podules and Upgrades test menu should be ignored for these models Hard disc drive and interface tests are included as part of the 400 series main PCB functional tests Note 3 For details of how to repair the main PCB see the chapter entitled Main PCB fault diagnosis and repair General test procedure IMPORTANT A suitable work area should be provided for servicin
76. lace them with the test ROMs 0 1 2 and 3 respectively see diagram below Note the correct position of the ROMs in their sockets Service Manual ROM pin 1 is three rows down from the top of the socket Fitting the test ROMs in place of the RISC OS ROMs Providing that the ARM memory controller and video controller are functioning the test ROMs will auto boot into the menu driven display below At any point in the operation of the test ROMs pressing the BREAK key or re powering the machine will re start the program and re display the menu 01234567890123456789012345678901234567890123456789012345678901234567890123 DIAGNOSTIC TEST ROMS MEMORY SIZE amp 0XX00000 BYTES CYCLIC MEMORY TEST WITH PRINTOUT CYCLIC MEMORY TEST SELECT 44 PCB fault diagnosis and repair 40011 amp R140 Service Manual Main memory test The memory test checks memory according to memory size selected It is possible that faulty memory may lie in the region designated as screen memory If this occurs the video display may become unreadable For this reason the sequence 0123456789 is repeated across the top line of the display Every 4 digits represents a 32 bit word Watch for missing or corrupted display As the start of the screen memory is known to be at physical address 82000000 it should be possible to determine the exact device that is faulty by examining the corruption pattern on the display The de
77. n front panel indicates mains power on Amber LED on floppy drive indicates drive activity Amber LED below power LED indicates hard disc drive activity Connectors Power inlet IEC 320 CEE 22 power inlet connector r gt Min Nominal Max Units Operating voltage 198 220 240 264 VAC Frequency 47 50 60 63 Hz eq Rating 70 VA Le ma Power Outlet IEC 320 CEE 22 power outlet connector This outlet is unswitched ie not controlled by the PSU on off switch and is live whenever power is applied to the power inlet Power rating 3 Amps maximum continuous 80 Amps maximum surge Expansion card bus A four position backplane is fitted as standard via a 96 way DIN 41612 connector to the main PCB The backplane is fitted with tour expansion card connectors Three of these are 64 way DIN 41612 connectors connector rows a and c only loaded into which any suitable non coprocessor expansion cards may be plugged The remaining connector is a 96 way with all rows a b and c loaded into which any expansion cards including a coprocessor can be plugged Technical specification A400n amp R140 Service Manual Red Green and Blue into 75 Ohms O Volts Minimum Level Black 0 7 Volts Maximum Level White ONECIE H Csync or Vsync Mode into 75 Ohms 0000000000000 lt 0 2 Volts Sync LOW 000000000000 gt 0 3 Volts Sync HIGH 25 24 23 22 21 19 18 17 16 15 14 H Csync or Vsync Mode untermi
78. nS ST 14 0 3 l C 26LS30 RS422 423 DRVR l C 26LS31 RS422 423 DRVR l C 26LS32 RS422 423 RCVR l C 7406 TTL 14 0 3 Component number C20 21 26 60 61 64 C15 23 24 33 34 C35 36 39 40 C65 TO 69 C28 31 32 C47 72 73 76 77 C51 C27 49 C53 74 75 C42 C62 C59 C58 C29 30 C56 57 C63 A1 53 K1 32 IC42 1C48 50 52 54 56 58 60 62 11023 1085 11029 IC65 IC46 1C6 IC28 IC5 44 1C35 39 unt e Parts list 53 aoon amp R140 Service Manual Part No 0740016 0740 038 0741 000 0742 374 0744 138 0745 074 0747 000 0747 004 0747 014 0747 051 0747 075 0747 138 0747 573 0747 574 0748 166 0749 014 0749 153 0749 543 0750 002 0750 004 0750 011 0750 245 0751 574 0770 324 0770 386 0780 241 0783 905 0783 907 Description Qty Component number LC 7416 TTL 14 0 3 OPTION LC 7438 TTL 14 0 3 2 1C9 40 C 74500 TTL 14 0 3 1 IC3 I C 74LS374 TTL 20 0 3 1 IC7 LC 74ALS138 TTL 16 0 3 1 1C64 LC 74AS74 1 IC2 LC 74HC00 CMOS 14 0 3 1 IC41 LC 74HC04 CMOS 14 0 3 1 IC66 LC 74HC14 CMOS 14 0 3 1 IC15 LC 74HC51 CMOS 14 0 3 1 1C47 L C 74HC75 CMOS 14 0 3 1 1C83 l C 74HC 138 CMOS 16 0 3 1 1C37 LC 74HC573 CMOS 20 0 3 5 IC14 21 24 30 31 l C 74HC574 CMOS 1 IC43 l C 74F 166 TTL 16 0 3 1 IC4 LC 74HCT14 CMOS 14 0 3 2 IC10 38 I C 74H
79. nated lt 0 2 Volts Sync LOW gt 2 4 Volts Sync HIGH Parallel printer STB 8 2 DO 9 High Resolution Mono Video 3 DI 10 4 D2 11 Two BNC sockets Video and Sync Monochrome gt D3 is composite video also available via internal links on the 7 DS 14 Sync BNC socket ACK and BSY Hi Res Data into 75 Ohms Vol 0 5 Volts at 24 MA Vol 0 8 Volts Voh 2 4 volts at 24 mA Voh 2 4 Volts 0 Volts Black 0 7 Volts White Serlal port SYNC lt 0 2 Volts Sync LOW 9 wa t i y D type plug gt 24 Volts Sync HIGH 1234 5 Audio 3 5mm 320hm stereo jack socket for output to suitable personal stereo headphones or hi fi system right left j gnd Econet Colour analogue RGB video 8 way D type socket 5 43 21 00000 0000 9 8 7 6 The red green and blue signals are analogue outputs each designed to drive a 75 Ohm terminated line 8 Technical specification A400 1 amp R140 Service Manual Keyboard 6 way miniature circular socket for keyboard connection 6 0 ON S5 4 O a O Jj 3 2 O O 1 Reset nic 0 Volts 5 Volts Serial data in Serial data out Mouse Three button mechanical mouse connects via a 9 way circular connector on the keyboard Switch 1 OV return 5V supply Switch 3 X reference Switch 2 X direction Y reference Technical specification Dimensions Main Unit Dimensions Overall height 97 mm excluding feet Overall width 362 mm
80. nd mouse 48 Expansion cards 48 Appendices 49 Parts list 51 Upgrading 65 Expansion card installation instructions Floating Point Co processor installation and operation guide Second floppy disc drive installation instructions Main PCB links and test points 67 Main PCB plugs and sockets 67 Technical Service Bulletins 69 Drawings 71 Main PCB function map drawing Main PCB links and test points drawing Main PCB plugs and sockets drawing Final assembly drawing Lower case assembly drawing Circuit diagrams 4 Contents 4 a00 1 amp R140 Service Manual About this manual This manual is intended to provide the information required to diagnose and rectify faults in the Acorn Archimedes 400 1 series and later model R140 computers derived from the 400 1 The information is structured to enable faults to be traced to modules with the option to either replace or repair the faulty module where repair is possible Where tull service facilities and test equipment are available reference should be made to the component level fault finding and repair information for the main PCB in the chapter entitled Main PCB fault diagnosis and repair This manual is divided into the following chapters Technical Specification System Description Disassembly and assembly Fault finding information Main PCB fault diagnosis and repair Appendices Updates to the Service Manual together with other relevant information a
81. nes their meaning binary 1 or 0 The nominal frequency of this clock is 10 MHz although it may have to vary slightly to compensate for variations in disc speed and or disc wobble Since this clock signal is not provided by the hard disc drive it has to be generated by the interface circuitry The Data Separator contains a voltage controller oscillator VCO some filter components and an input for a crystal controlled 10 MHz clock When the HDC is not trying to read data from the hard disc drive the VCO is locked onto the 10 MHz crystal clock To read data the HDC first asserts the read gate signal RGATE this causes the data separator DP8455 IC85 to attempt to adjust the VCO 16 frequency and phase until the VCO cycles are in quadrature with the data pulses when they are present vco CLOCK ho t r 20005 u i h sync 4 gt DATA L_T CLL ST L When the data separator has detected valid preamble a special pattern of Os and 1s it asserts lock detect LD which enables the now synchronised data stream to the HDC In turn when the HDC sees a special data pattern called an address mark it asserts SYNC This signal is linked back to the data separator and used to slow down the tracking action of the VCO during the actual read process Write data Write data timing is synchronised to the 10 MHz crystal oscillator The data emerges from the bi directional data pin RWDATA on the HDC and is fed to a delay l
82. nformation If the screen stops clearing the characters as you press the keys go back to the lowest leftmost key remaining on the screen and start again from there Note If you accidentally press two keys together you will see both keys displayed on the screen You should press the BREAK key to continue If the same fault occurs repeatedly or the picture of the depressed key refuses to disappear then it will be IMPOSSIBLE to continue the test You should replace the keyboard PCB and start the whole test again 4 Continue working along the bottom line Then start working from left to right along the next line up 5 When all keys in the main keyboard area have been pressed successfully the screen clears and displays a diagram of the rest of the keyboard area Again press each key in turn following the guidelines above 6 When all the keys have been successfully pressed the screen clears and displays the following message MOUSE TEST PASSED MAIN KEYBOARD TEST PASSED NUMERIC KEYPAD TEST PASSED NOW PRESS RESET BUTTON Press the Reset button on the back of the keyboard The display will now show MOUSE TEST PASSED MAIN KEYBOARD TEST PASSED NUMERIC KEYPAD TEST PASSED RESET BUTTON TEST PASSED NOW PRESS SPACE BAR TO RETURN You have now finished the keyboard functional test Press the space bar to return to the A300 A400 Test Menu Completing the tests 1 If no further tests are to be carried out select o
83. ng and that an inserted disc clears the front moulding Adjust the position of the new drive 1 as appropriate 400 1 only Check the alignment of the drive fascia pancl with the aperture in the front moulding Adjust the position of the new drive 1 as appropriate Provided that its position has not been disturbed the original drive O should align correctly Tighten both disc drive 1 bracket fixing screws Plug the LED speaker connector to PL9 on the main board ensuring that the locking ears on the connector locate either side of the locking tab on the board mounted connector see Fig 7 step 4 Stick the small white serial number label provided onto the top of the new floppy drive s case not its bracket alongside the batch code number if fitted It is important that this label is fitted in case any warranty claims should arise Visually check that all is well then refit the top cover and tighten all fixing screws Remove the backing paper and carefully fix the appropriate model label to the new front sub moulding Press it down firmly when it is in the correct position If you have removed any expansion cards replace these and refit the backplane Slide the cover back onto the computer and refit the five screws securing it Reconnect the keyboard monitor and peripherals to the computer unit Reconnect the system to the mains supply and switch on Second floppy disc drive installation 27 Exit from the desktop and
84. ng IC1 and XI 2 Check for clocks on MEMC IC 34 pin 67 and VIDC IC 8 pin 19 E 3 Check that the signal RST driving MEMC IC 34 pin 44 and IOC IC 32 pin 9 is not stuck high 4 Check for the presence and validity of the processor addresses and PHI 1 clock This can be done by examining the signals on IC 31 pins 12 to 19 IC 30 pins 12 to 19 and IC 24 pins 16 to 19 whilst holding down the RESET button on the keyboard In this situation the processor continuously increments its address bus Should any of the signals not toggle suspect either a short or open circuit on that line Should none of the signals toggle check for the PHI 1 clock on the appropriate IC and on MEMCIC 34 pin 66 Also check to see that addresses are being presented to the inputs of the above devices Change ICs 30 31 or 24 as appropriate or if no addresses are present change the ARM IC32 5 The data bus can be inspected by probing on resistors R161 to 192 By their nature it is difficult to interpret the signals seen so just check for the ability of the signals to move between logic states None of these lines should be stuck permanently high low or in a midrail state Any of these resistors may be removed in order to isolate the DRAM bank from the CPU thus easing the tracing of shorts etc Also check for short or open circuits on the BDATA bus IC 14 pins 12 to 19 and IC 22 pins 12 to 19 A fault here may well cause a false interrupt 6 Check for shorts on DRAM
85. nnectors otherwise you may bend the pins or break or disconnect the backplane itself It does not require great force to install the expansion card correctly If the expansion card will not seat easily remove the expansion card and try again When you have fitted an expansion card to your computer the backplane should be in a vertical position assuming that the expansion card is fully inserted and screwed into the rear of the computer For some combinations of machines and expansion cards however the top of the backplane may appear to lean towards the front of the machine If this is the case you must insert the two spacers found in this package Each spacer should be inserted between the internal face of the expansion card backplate and the metal clips on the rear plastic moulding of the machine so that the fixing screws pass through both the backplate and the spacers see Fig 3 This should result in the external face of the expansion card backplate panel being flush with the rear plastic moulding if REAR PANEL OF SPACER EXPANSION CARD Fig 3 Fitting spacers to the expansion card backplate When you have done this you may need to straighten the backplane to ensure that the connectors are correctly mated To do this take the following steps 1 Slacken off the two screws fixing the backplane support metalwork to the base metalwork and power supply 2 Holding the expansion card stationary ease the backplane tow
86. nstallation 1 CZ TOP COVER FIX TOP COVER FIX Fig 1 The screws holding the top case 3 Once you have removed the three rear screws and the two side screws slide the cover of the unit to the rear of the machine then remove it completely Slightly spring the sides of the cover outwards if necessary to make it easier to slide Fitting the upgrade Fit the second floppy disc drive drive 1 alongside the original drive drive 0 on the disc drive support bracket as follows 1 Remove the two screws securing the front moulding assembly at each side Stand the unit on one side and remove the three screws securing the front moulding assembly underneath the computer see Fig 2 2 Stand the unit back on its feet and unplug the LED speaker connector PL9 from the main board see Fig 5 If a backplane is fitted remove any expansion cards and lift the backplane out of the way without removing the wires connected to the backplane Grasp the front moulding assembly at each end and use a straight steady pull to withdraw it from the front of the unit FRONT MOULDING FIX FRONT MOULDING FIX Fig 2 Removing the front moulding assembly 2 Second floppy disc drive installation 3 Unplug and remove the ribbon type data cable which connects SK11 on the main printed circuit board to the connector on the rear of the original disc drive O Plug the centre connector on the new dual drive cable assembly to drive O and the end connector
87. o be created or modified The Boot file is a special file in your root directory that can be configured to run at every power on reset or Ctrl Break To load the FPEmulator module you should add the following command line to your Boot file RMEnsure FPEmulator 3 20 RMLoad System Modules FPEmulator You can also add this line to any application Run files of your own Do not explicitly RMLoad the module because future versions of RISCOS are likely to incorporate this or a later version of the FPEmulator module 2 If you want to enter the desktop always make sure that the last command in your Boot file is Desktop 3 To make the Boot file run automatically at power on make its filetype OBEY refer to the SetType command in the User Guide and type Configure Boot Opt 4 2 4 You can now obey the Boot file by pressing Ctrl Break WE32206 Floating Point Co processor 5 The FP280 emulator file The FP280 emulator file is the latest version of the softwarc only floating point emulator and is provided so that a direct performance comparison betwecn hardware assisted and software only floating point operation can be made It also has the module name FPEmulator not to be confused with the filename so that RMLoading it will mean that only one version of the floating point world will exist and be active at any one time It is not necessary to remove the co processor card simply RMLoading the file FP280 will disable the har
88. o initialise To make use of this section of the ROMs the following test equipment is required Oscilloscope Signal or pulse generator PCB fault diagnosis and repair The purpose of the code is to produce certain signals around specific areas of the PCB These signals may then be monitored using the oscilloscope to assess the operation of that area of the circuit The code is written in a loop which should execute three times before proceeding to the main memory test For this reason the machine must be reset repeatedly A suitable square wave or preferably a negative going pulse generator output at 10 kHz should be connected to the reset line via a component connected to IOC IC22 pin 29 After setting the border colour to white the signals should be observable in the following order Return to start for three executions 45 4a00 1 amp R140 Service Manual After execution of this code the border colour is reset to black The assembler listing for this section of the code is given below Start1LDRTrO r5 i SVPMD pin low LDRT ro r5 jenrtinuai toggle of LDRT ro rs LDR rl iocmof re load icc base add offset LDR ro tra r6 SVPMD pin high LDR ro rl r6 TOC CS pin high 51 loc hi LDR ro rl r TOC CS pir high 82 108 h LDR ro ri r6 IOC CS cin high SO SRA LDR ro EL GEJE 100 CS pin nigr pati LIG M LDR ro ri r6 FIOS SS LR TOS CASH r LDR ro frl
89. o position A e if you have upgraded to 4Mb then set link LK15 to position A and LK14 to position A Technical Service Bulletin 2 89 Attach the serial number label Attach the serial number for the 1Mb upgrade in position A see Figure 3 on the underside of the PCB If upgrading to 4Mb attach the extra serial numbers in positions B and C Reassemble the computer Reassemble the computer following the procedure given in the 400 1 Service Manual Remember to replace any expansion cards you may have removed Change the front panel model label Peel off the old model label on the front panel and fit the appropriate new label from the kit Test the computer Endorse the guarantee form Complete the Installation details on the Upgrade Guarantee form part number 0483 051 enclosed with the kit The installation is now complete Front of computer Figure 3 Serial number positions Copyright Acorn Computers Limited 1989 Published by Acorn Computers Limited Part number 0483 052 Issue 1 June 1989 20f2 400 1 RAM Upgrade Technical Service Bulletin 2 89 400 amp R140 Drawings Appendices Service Manual 71 400 1 amp R140 Service Manual 72 Appendices
90. o reset the time or date you would select 2 or 3 For example you can 1 Type 1 to check the date and time 2 Check that the time is correct and the seconds are incrementing correctly To continue with the test press the Space bar Loudspeaker The test continues by testing the operation of the loudspeaker A short repeating sequence of eight musical notes is played and the following message is displayed LOUDSPEAKER TEST LISTEN AND CHECK SOUND THEN PRESS lt SPACE gt TO CONTINUE You should 1 Listen to the sequence of notes 2 This is a subjective test so if you detect any deviation make a note of the fault Action if test fails If no sound check speaker connections Substitute a known good speaker and retest If OK replace speaker If test still fails change the main PCB or see the chapter entitled PCB fault diagnosis and repair 3 To continue with the test press the Space Bar Headphones The functional test continues by testing the Headphones 32 Ohm socket The following message is displayed as the test proceeds HEADPHONE TEST RUNNING LISTEN AND CHECK SOUND THEN PRESS lt SPACE gt TO CONTINUE The test consists of a repeating sequence of eight musical notes The first four notes are played on one headphone and the next four notes on the other headphone 1 Put on the headphones 2 Listen to the sequence of notes 3 This is a subjective test so if you detect any deviation in either he
91. ocessor once it is installed The floating point co processor gives an execution speed increase of un to eight times Please read through the following instructions carefully before you start If you do not feel confident about carrying out this installation take the co processor card and your computer to your supplier who will fit the card for you A charge may be levied by the supplier for installing the card such a charge is entirely at the discretion of the supplier concerned Removing the cover of the computer 1 If you are using the RISCiX operating system you must first follow the RISC iX shutdown procedure to halt the operating system 2 Switch off the computer at the rear and unplug the power cable from the mains supply Disconnect the keyboard monitor and any peripherals and move them out of the way 3 Locate the screws holding the cover in place see Figure 1 Remove the three screws at the top rear of the unit then remove the single screw located on each side of the unit towards the front 4 Once you have removed the three rear screws and the two side screws slide the cover of the unit to the rear of the machine then remove it completely Spring the sides of the cover slightly outwards if necessary to make it easier to slide TOP COVER FIX TOP COVER FIX Figure 1 Removing the screws holding the top case 5 The backplane has two upper and two lower expansion card slots Co processor cards can only operate in
92. ome monitor OR Analogue RGB monitor Fault finding Information A400 1 amp R140 To test the I O expansion card you will require the following additional equipment e Port Tester assembly from which only the following parts are needed Port Tester main PCB 34way IDC skt to 34way IDC skt cable assembly e 20way IDC skt to 20way IDC skt cable assembly 15way IDC D type plug to 15way IDC D type plug assembly To test a MIDI upgrade you will require the following additional equipment e MIDI upgrade which should be fitted already Acorn Econet cable Connecting up the equipment It is important to connect the equipment to the computer in the correct order Connect the keyboard to the front panel connector hi res monochrome monitor to the Mono and Sync sockets or analogue RGB monitor to the Analogue RGB socket Port Tester 1MHz Bus socket to the computer s 1MHz Bus socket using the 34way IDC cable Port Tester User Port socket to the User Port socket using the 20way IDC cable Port Tester A D Port socket to the Analogue Port socket using the 15way IDC D type cable MIDI IN socket to the MIDI OUT socket using the Econet cable monitor to the mains supply computer to the mains supply Running the test If you have not already done so follow Running the tests in the introduction to the Expansion tests above Select option 1 VO Podule 8 MIDI Upgrade A fur
93. ot need to update the defects file as this is done automatically but you should write down the cylinder head and sector defects on a piece of paper as a record This should be retained so that if the user wants to reformat the hard disc at a later date the information can be checked against the defects list Note If the soak test finds more than 20 defects in total the program terminates immediately The disc has then failed the soak test At the end of this period the program runs the Termination sequence This is followed by a large banner display reporting either a PASS or FAIL If the test disc 0283 090 has been removed it must be replaced in drive O before you continue When the soak test has finished you should reformat the disc using the new map Refer to the previous section for instructions Press the space bar to return to the previous menu The display will return to the A300 A400 Test h anu Action if test fails lf drive is faulty replace it using the Hard Disc Upgrade instructions as a guide Quitting the soak test j If for any reason you need to quit the soak test before completion press Q to return to the A300 A400 Test Menu Quitting the soak test wil leave the hard disc in a partially formatted state ie unusable lt must therefore be formatted select option 1 on the menu which appears Select option 5 to park the disc heads if testing is not to continue for any reason The final step is to
94. ow Running the tests in the introduction to the Expansion tests above At the Archimedes Podule Tests menu select option 4 ROM Podule The test program is then loaded and automatically runs When the test is finished a message is displayed to tell you whether the ROM expansion card has passed or failed You have now completed the ROM expansion card tests See On completing the tests in the introduction to the Expansion card tests Remove the test ROM and reset links LK1 6 and LK2 6 I O expansion card test amp Midi upgrade test Introduction The I O expansion card test should be carried out whenever you install repair or replace an VO expansion card The MIDI Upgrade test should be carried out whenever you install repair or replace the MIDI Upgrade for the 1 O expansion card Note These instructions assume that the I O expansion card the MIDI upgrade to the expansion card if fitted and the backplane have already been correctly installed See Upgrading in the Appendices if you need instructions for installation or removal of the I O card Installation details for the MIDI upgrade to the I O card are given in the Archimedes 300 and 440 Service Manuals Equipment required In order to carry out the tests you will require the following equipment VO expansion card to be tested which should already be fitted Computer Archimedes keyboard 3 5 inch test disc which is write protected Monochr
95. ption 5 Hard Disc Park to park the hard disc heads if fitted Then press the space bar to return to the A300 A400 test menu 2 select option 7 to return to the main Dealer Test Menu then select option 3 Load Save CMOS RAM to re load the contents of the CMOS RAM When prompted replace the test disc with the data disc on which the CMOS RAM contents were saved Type L to load the data into RAM Type the filename to use followed by lt RETURN gt 3 Select Q to return to the Dealer Test menu and select the Quit to desktop option 5 4 Switch OFF the power to the computer at the mains switch on the rear of the machine 35 Aa00 1 amp R140 Service Manual 5 Switch OFF the power to the rest of the equipment Action if test fails Make sure that the configuration items DELAY and REPEAT are set to sensible values see the User Guide If the keyboard PCB is replaced re run the keyboard functional test Expansion tests Introduction Run the relevant expansion test detailed below if it fails substitute a known good expansion card If the test still fails substitute a known good backplane If the test still fails either replace the main PCB or repair it For expansion card details see the relevant user guide supplied with the card Running the expansion tests These tests alter the contents of the battery backed RAM that holds the computer s configuration data These must be saved before any o
96. re made available through Technical Service Bulletins the first of which are included in the Appendices Check these for later information before you start a repair job About this manual A 0011 8 R140 Service Manual 6 About this manual A400 amp R140 Service Manual Technical specification Computer main unit Processor 4 8 MHz ARM Acorn RISC Machine 2u processor 24 MHz main system clock 96 MHz master clock oscillator System performance is typically 4 MIPS RAM Memory Capacity 1 Mb 8Kb page 2 Mb 16Kb page 4 Mb 32Kb page 4 Mb 32Kb page ROM Memory Four 32 pin sockets are fitted The options are shown below Capacity 4 off 64K x 8bit ROM EPROM eg 27512 4 off 128K x 8bit ROM eg 62301 ROM 4 off 256K x 8 bit ROM EP ROM standard 4 off 512K x 8 bit ROM EPROM Real time clock Powered by internal batteries while the computer is switched off Non volatile RAM 240 bytes of static RAM which maintains preferred machine configuration Powered by internal batteries while the computer is switched off Internal batteries Two LRO6 AA size 1 5 V Manganese Alkaline cells fitted inside computer main unit Batteries require replacement once a year Controls Mains on off switch at rear of unit integral with PSU Floppy disc eject button s on front panel System reset button on rear of keyboard unit Indicators Green LED o
97. round the A Series chip set comprising the Acorn RISC Machine ARM the Memory Controlier MEMC Video Controller VIDC and Input Output Controller IOC For a detailed explanation of the system see the RISC OS Programmer s Reference Manual The following is intended to provide the salient features of the system for guidance A block diagram of the Archimedes 400 1 series is shown below General The ARM IC is a pipelined 32 bit reduced instruction set microprocessor which accepts instructions and manipulates data via a high speed 32 bit data bus and 26 bit address bus giving a 64Mb uniform address space The ARM supports virtual memory systems using a simple but powerful instruction set with good high level language compiler support MEMC acts as the interface between the ARM Addr Latch System description Address Bus K VIDC IOC Read Only Memory ROM and Dynamic memory devices DRAM providing all the critical system timing signals including processor clocks 1 2 or 4Mb of DRAM is connected to MEMC which provides all signals and refresh operations A Logical to Physical Translator maps the Physical Memory into a 32Mb Logical address space with three levels of protection allowing Virtual Memory and Multi Tasking operations to be implemented Fast page mode DRAM accesses are used to maximise memory bandwidth The VIDC requests data from the RAM when required and buffers it in one of thre
98. t Co processor This new version of the FPEmulator module will execute floating point instructioms with or without the floating point co processor being present There should be no effective difference in operation other than speed of execution for floating point instructions However there may be slight variations in accuracy between the hardware co processor and the software emulator when enumerating certain trigonometric operations to extended precision accuracy Intermediate calculations may use extended precision when evaluating complicated expressions in compiled languages and this too may produce variations in accuracy even in calculations where the final product is expressed in single precision Loading the floating point module Before the co processor board can be used the combined floating point emulator module and co processor support code has to be loaded and initialised From the desktop you can load and initialise the module by double clicking on the module filename or file icon Similarly you can load and initialise the module from the command line by typing for example RMLoad FPEmulator Users should copy the FPEmulator module into the System Modules directory replacing the old FPEmulator This will enable RISCOS applications automatically to load the correct FPEmulator module on startup Modifying a Boot file 1 To load and initialise the floating point module each time the computer is switched on a Boot file has t
99. t is a recommended requirement that anti static precautions should be utilised at all levels of servicing ie antistatic matting and wrist straps In all instances follow through the checks until the fault is located and identified Refer to the previous chapter Disassembly and Assembly for information on how to gain access to the components mentioned DANGER WHEN REFITTING OR FITTING A REPLACEMENT ASSEMBLY CHECKS SHOULD BE MADE FOR EARTH CONTINUITY BETWEEN THE EARTH PIN OF THE MAINS PLUG AND THE FOLLOWING THE BASE METALWORK THE REAR PANELS INCLUDING BLANKING PANELS THE TOP COVER USE AN EARTH CONTINUITY TESTER SET TO 25 AMPS Fault finding information 21 _A400 1 amp R140 Service Manual Checking a dead computer START REPLACE PCB OR 1 SEE NO SOUND FLOWCHART 2 PERFORM PCB SYSTEM FAILURE TESTS REPAIR FAILURE TESTS 4 REPAIR 22 Fault finding information 44001 amp R140 Service Manual No sound TYPE AUDIO ON SPEAKER ON PRESS CTRL G CHECK FOR PL5 OV PL6 5V PL7 5V RESTORE POWER REPLACE PSU BELL SOUND POWER SUPPLIES ALL OK REPLACE LEAD SPEAKER amp RE TEST OK NOW RUN TEST PROGRAM ALL CHANNELS WORKING REPLACE PCB OR PERFORM AUDIO TESTS ON PCB AND REPAIR TEST PROGRAM 10 REM gt Check all channels 20 VOICES 8 30 FOR channe
100. tch cap must be removed from the original keyboard and fitted to the replacement 19 A40011 amp R140 Service Manual Assembly Keyboard assembly is generally in reverse order with the following notes Slot the PCB support tray under the two fixing screws at the end furthest from the keyboard cable then insert the remaining screws Check that all keys clear the cutouts in the top moulding before finally tightening all PCB fixing screws Mouse The mouse is a service replacement only item 20 Disassembly and assembly aoo1 amp R140 Service Manual Fault finding information Introduction This chapter is a guide to the diagnosis and repair of basic faults in the Archimedes 400 1 series and later R140 computer systems It consists of algorithms to enable you to trace and remedy faults in a dead computer followed by instructions for running the Archimedes functional test software which is designed to isolate taults in a computer which is working The next chapter Main PCB fault diagnosis and repair is designed to help repair centres to diagnose and repair faults at component level on the main PCB Test equipment required 100 MHz Oscilloscope DC Voltmeter Earth Continuity Tester Test Disc Acorn part no 0283 090 Serial Port Loopback Plug Headphones 32 ohm impedance Chip extraction tools 68 84 pin Standard hand tools such as screwdrivers and pliers l
101. the first recorded failure Performing soak tests At the end of each test you should carry out a soak test To do this leave the unit under test powered up for eight hours or alternatively overnight After carrying out the Soak test it is advisable to retest the unit Repairing faults When repairing an Archimedes computer you should repair the faults in the order in which they occurred during the test ie repair the first recorded failure FIRST For further information on checking for component level faults on the main PCB and carrying out repairs refer to the chapter entitled Main PCB fault diagnosis and repair Disconnecting the equipment IMPORTANT If you have completed service or tests on the system and are about to move the computer and or return it to the user the following MUST be done BEFORE switching off Park the hard disc heads if a hard disc drive is fitted details are given after each relevant test e Load the contents of the CMOS RAM back into the machine details are given after each relevant test 1 Switch OFF the power to the Archimedes computer at the mains switch on the rear of the machine 2 Switch OFF the power to the rest of the equipment It is important to disconnect the equipment from the computer in the correct order ie disconnect the Archimedes computer from the mains supply monitor from the mains supply Hi res monochrome monitor from the Mono and Syn
102. ther menu is displayed Archimedes I O Podule Test Menu c Acorn Computers Ltd Version 4 1D 1 I O Podule Test 2 I O Podule Soak 3 MIDI Upgrade Test 4 MIDI Upgrade Soak 5 I O Podule and MIDI Upgrade Test 6 I O Podule and MIDI Upgrade Soak 7 Return to Main Menu Select the appropriate test from the menu then follow it with the corresponding soak test AIl the tests load and run automatically giving a PASSED or FAILED message at the end Service Manual Note The MIDI upgrade can be tested regardless of whether the YO expansion card passed its test or not You have now completed the I O expansion card and MIDI upgrade tests See On completing the tests in the introduction to the Expansion card tests MIDI expansion card test Introduction The MIDI expansion card test should be carried out whenever you install repair or replace a MIDI expansion card Equipment required In order to carry out the tests you will require the following equipment computer keyboard 3 5 inch test disc which is write protected MIDI expansion card under test a second known good MIDI expansion card 2 Acorn Econet cables which have been labelled IN and O P monochrome monitor OR analogue RGB monitor Setting up the MIDI Expansion Cards For this test to function correctly the MIDI expansion cards MUST be installed in these positions The MIDI expansion card under test must be in the upper
103. ting errors found on the disc for example Disc error 10 at xxxxxxxx where xxxxxxxx is the error address These errors should be noted and the disc re formatted with the errors entered as defects Fault finding information After verifying the disc the Hard Disc System Soak Test should be selected see below Hard disc soak test WARNING Running this test on a hard disc will destroy all the data currently held on the disc Ensure that users are aware of this and that they give you their consent before you start To start the soak test select option 3 lt RETURN gt on the A300 A400 Test Menu The screen displays a warning The following is displayed HARD DISC SOAK TEST V1 01 DEALER WARNING Running this test on a hard disc that has data on it will DESTROY ALL DATA currently held on the disc Please ensure that users are aware of this and give you their consent before you start Please ensure that a hard disc drive has been fitted to this machine Please DO NOT continue with the test if the hard disc has not been fitted or you do not have the users consent Continue Y N If you press N the previous menu will be re displayed Press Y lt RETURN gt if you wish to continue This followed by Test Drive 4 Press lt RETURN gt for default value or enter other drive number followed by lt RETURN gt The Soak test then starts and runs for approximately twelve hours record of any defects are displaye
104. top cover as detailed above The cooling fan is mounted against the front left side of the casing viewed from the front alongside the battery holder 2 Remove the two nuts securing the filter clamp carefully withdraw the clamp and the filter from the fixing bolts 3 Unplug fan power connector PL12 from the main PCB then remove the four nuts and withdraw the tan from the fixing bolts Disassembly and assembly 4 When refitting ensure that the two filter nuts are fitted diagonally opposite each other Note lf a hard disc drive is fitted the main PCB must be partially withdrawn to gain access to connector PL12 See Removing the main PCB above Main unit assembly Assembly is generally the reverse of the disassembly procedures but take care with the routing of cables and ensure that leads are not trapped when refitting assemblies to the main unit Keyboard Disassembly 1 Invert the keyboard and place it on a soft level surface 2 Remove the eight Pozidriv screws securing the two halves of the case and carefully lift the base moulding away 3 The PCB is fixed to the top moulding by four No 6 x 0 25 screws two at each end of the metal PCB support tray plus on some units three further screws at A B and C Remove the three extra screws first if fitted then remove the two screws from the end nearest to the keyboard cable Loosen the two remaining screws and lift the board clear Note that the reset swi
105. x 256 256 TEXT ONLY 16 640 x 256 256 TEXT ONLY 16 TEXT ONLY 16 0 1 2 3 4 5 6 7 8 9 640 x 512 80 x 64 640 x 512 80 x 64 640 x 512 80 x 64 640 x 512 80 x 64 1056 x 256 132 x 32 640 x 480 80 x 50 640 x 480 80 x 50 640 x 480 80 x 50 640 x 480 80 x 50 Hi resolution monochrome mode In all modes except Teletext the colours can be chosen from a palette of 4096 colours with some restrictions in the 256 colour modes Note Modes 24 to 28 can also be used with certain VGA type monitors 10 Technical specification 4400 1 amp R140 Service Manual Packaging and installation The computer main unit keyboard and mouse are supplied in a moulded two part polystyrene packing in a cardboard carton Also included are the Applications Suite a Welcome Guide a BBC BASIC Guide a User Guide a BASIC editor Keycard and a guarantee card An optional colour or monochrome monitor is purchased and packed separately Do not use the computer system in conditions of extreme heat cold humidity or dust or in places subject to vibration Do not block the ventilation slots in the main unit casing Ensure that no foreign objects are inserted through any openings in the casing Technical specification 11 A40011 amp R140 12 Service Manual Technical specification A400 1 amp R140 Service Manual System description Introduction The Archimedes 400 1 series computer is built a
106. you are going to use and remove the corresponding blanking plate by unscrewing the two screws holding the plate in position You can now fit the cxpansion card Fitting the expansion card WARNING Some components on expansion cards can be damaged by static electricity Avoid touching chips on the card Before fitting the expansion card examine it to see whether it is a full width or a half width card 1 A full width expansion card has a plate at the rear which extends the full width of the machine If the plate on the rear of your expansion card does not extend the full width of the machine then you are supplied with a blanking plate along with a T piece and two screws Use these to make the expansion card up to the full width of the machine Once you have made the expansion card backplate up to the correct width you can install it into the computer The diagram below shows an expansion card fitting into one of the positions in the computer unit Fig 2 Fitting an expansion card into the lower slot Expansion card installation 2 2 To fit the expansion card support the backplane firmly with one hand and push the connector on the card into one of the sockets on the backplane The connector should be securely seated i e the rear plate of the expansion card should be flush with the rear of the computer case It is important that you offer the expansion card up to the backplane at right angles to it and that you align the co
107. ys then press and release the BREAK key Release the remaining keys 12 The first test is the computer type model test This test is extremely fast and the type and model number of the computer is displayed immediately This computer is an ARCHIMEDES nnn CHECK FRONT LABELS THEN PRESS lt SPACE gt TO CONTINUE You should check that the number displayed on the screen is the same as on the label on the front of the computer NOTE For 400 1 series machines the machine type displayed as Annn 1 where nnn is the basic machine type eg 410 420 and 440 The 1 indicates that the machine has RISC OS and MEMC1A fitted lf an earlier machine has been upgraded it will be recognised as its equivalent 400 1 series model For example An A310 upgraded with RISC OS and MEMC1A would be recognised as an A410 1 An A440 upgraded with RISC OS and MEMC1A would be recognised as an A440 1 An A410 1 fitted with a 1MByte upgrade would be recognised as an A42011 A model R140 will be recognised as an A440 1 If the number is NOT the same or correct for the upgrades fitted check inside the machine for the amount of RAM fitted If the test is giving the wrong result there is a fault in the memory areas ACTION Either change the main PCB or see the chapter entitled PCB fault diagnosis and repair NOTE Incorrect model data or other problems resulting from this test are an indication that the machine has a major system fault As this test

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