Interact Service Manual
Contents
1. Bi VOR la 97 0 CI a Ame _ _ 600 00 GOITYOM 12313 vm I SORES 1 Dee wut TES 00 3e 32 irn Zi 12413 See INAG 9 di dw anv 0 oz ved If 9112 3vm j Li BB tes di 0 96 di 4 3 ost vld AN 1 21 15 17 8 7 9 rm 9710 61 3H2S GPINOWLIQIZ muma 0100 01 t ewe T ors RE Ww Lr aaa 8 Ser 722 267 2290412117 7 emus 01 27 6 4m v 211 di 19 Suv piv Sv lt lt gt2. PEE 4 lt 600 SOGRE 680 GEEK gt 2 RTC A D Data Read 8 3000H 07 00 pane ales 7 Bit Function determined by counter function select bits D7 amp D6 of misc output 3000H a 0 no tape flux change when 07 amp D6 00 1 tape flux change when D7 amp D6 00 1 Keyboard Joystick Data Read 3800 3807H 8 Read 3800H gt Backspace eee Sire Lock Cotro Read 3801H 00 d 1 0 3 Read 3802 J 1 8 3 0 C Read 8 3805H H H Z O 20 I lt h Read 8 3807H West Lft East DN North South 0 West sRt Fast O Rt North 0 Rt South 5 4 Memory Write 7 Color Register 1000 07 00 olm _ T EM Color Register 00 Where 000 Black 001 AB Green 011 Yellow 100 Blue 101 Magenta 110 Cyan 111 White Color Register 10 Same as COO Control
3. apu OT i X te EART 7 8 E 5 7 2 2 7 ith reU Del Z 7 7 gt s EA ra nm 1 0 OF nec FIGURE 7 Cassette Transport In Housing 13 14 FIGURE 8 Cassette Transport Sub assembly 4 Die AC Power Adaptor Sub assenblv Removal and Installation Camplete procedure 1 on page 6 Upper Assembly 1 and Installation Remove each of the five 5 wires on the AC adaptor card shown Figure 9 Remove the cord clamp from the top of the Main Electronics Sub assembly Remove the AC adaptor fram the lower assembly The AC adaptor assembly can be installed by reversing steps l through 3 beginning at step 3 Note Make certain color code of wiring is followed fram left to right White Black Orange Red Blue Main Electronics Sub assembly Removal and Installation Camplete procedure l on page 6 Upper Assembly Removal and Installation Renove the four 4 screws shown in Figure 9 and lift the Main Electronics Sub assembly out of the lower assembly See Figure 10 The Main Electronics Sub assembly can be installed by reversing steps l through 2 beginning at step 2 4 7 tttm gt de ae AR UM xm e
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5. gt FIGURE 6 Control Panel Sub assembly 11 rA 4 2 5 I Control Panel Sub assembly Removal and Installation a Complete procedure l on 6 Upper Assembly Removal and Installation Remove the two 2 tinnerman nuts shown in Figure 5 Lift the Control Panel Sub assembly see Figure 6 Care must be taken in removing the nuts because too much stress will cause the locating plastic pins to break The nuts can be removed quite easily by using long nose pliers and pinching the ends toward the pin The Control Panel Sub assembly can be installed by reversing steps 1 through 2 beginning at step 2 Cassette Transport Sub assembly Removal and Installation Complete procedure 1 on page 6 Upper Assembly Removal Installation Remove the transport brackets shown Figure 7 Lift the cassette transport out of the transport housing See Figure 8 The Cassette Transport Sub assembly can be installed by reversing steps 1 2 beginning at step 2 Cassette door can be inserted back in track by loosening the transport brackets Figure 7 until transport housing has enough slack from upper assembly to allow pivot arms of cassette door to slide into track notch It is usually easier to do this with door spring removed 12 4 AP ogg sen x Y E Dar uer rere Est 3 teas
6. gt 7 D Ra Check color code AC Adaptor Cord NOTE 16 FIGURE 9 Assembly Ajquwasse qng 52 0412 3 UJEW Ol 340914 by INED TN NEM 6 0 Tape Eead Alignment Procedure This procedure can be accomplished onlv after all system faults have been resclved according to sections 1 throuah 5 of this manual The equipment necessarv to perform a head alignment includes Interact Head Alignment Tape Television Receiver Antenna Switch Box Small Phillip s Head Screwdriver Begin by connecting the Interact computer console to the television as described in the Model One Owner s Guide Proceed as vou would for normal operation by completing the following steps Turn the power ON OFF switch Depress the button labelled RESET Confirm that the message DEPRESS L TO LOAD appears on the Screen If this message does not appear on the screen a system fault exists and must be repaired before alignment can be performed Load the Head Alignment Tape into the cassette holder see the Owner s Guide for details and depress the letter L on the keyboard Press the REWIND cassette button and allow few seconds for the tape to rewind Press the READ cassette button The cassette spindles should begin to turn slowly As the tape reads in a steady tone is produced Insert the small Phillip s screwdriver into the access hold in the cassette t
7. the screen When the key is pressed five sounds are heard in succession Thev are l High hardware tone varies aroung 800 HZ 2 High software tone about 800 HZ usually a little higner than sound 1 3 Low hardware tone about 70 HZ 4 LOW software tone about 35 HZ 5 Short gunshot hardware sound 35 Sound system failure is evidenced bv TA Wo sound at all 2 Fewer than fiva sounds 3 Hardware souncs buzzy or harsh compared to software sounds 4 Sound 1 very different in pitch trom sound 2 5 Bound 3 very diltsnent piton from sound 4 After the five sounds produced the test menu reappears on screen The operator should note any sound system failures before proceeding to the test If vou encounter a sound system failure replace the Main Electronics Sub Assemblv as described on sage 15 Return the faulty sub assembly with a completed Factory Service Tag Test 6 COLOR CZZC Tuis test checks tne color generation CITIES o Interact swscam When this test is selected the following messace appears on che screen 2555 8 S1 82 3 as aach of the keys S 1 8 2 and F is derressec the background color the screen changes to rad green vellow cyan and magenta rassectivalyv The order in which the keys are is unimportant At the same time key is pressed it is Blankad cut irom the screen displav When color 15 chosen a message appears at t
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9. Main Electronics Page 15 door in track Page 12 1 Assembly Removal and Installation In order to remove any module from the computer console this procedure must be completed first ls Turn the Interact unit over so that the bottom of the lower assembly is showing as in Figure 2 Place it on a soft surface 55 avoid marring the unit Remove the six 6 screws at the corners and top and bottom center of the lower housing Carefully holding the top and bottom assemblies together turn the unit back over so that the control panel is up as in Figure 3 Lift the upper assembly up at approximately a 45 angle so that the internal cables are exposed as in Figure 4 Remove all connections and free the upper assembly as Eigure 5 The upper assembly can be installed b5by reversing steps 1 through 5 beginning with step 5 qquassy Buysnoy 43801 7 534 7 at es dns S 2 EM t nnn c eet 064 wf gt A T NL 9 x EUN tp nm dn FIGURE 3 Model Upper Assembly Closed 340914 5 5 uadg 3 80 414 0 A ANNE Tinnerman Nuts 10 FIGURE 5 Upper Assembly Fully Open comments P T C
10. Un E Tape Output Data to Tape b Color Register 8 1800H D7 DO 55 01 Color Register 01 Same as 600 Color Register 11 Same as CO0 Intensity Affects color C10 Color 10 1 2 intensity 0 Color 10 normal software sound Toggled by cpu to create desired tone B Sound Register 2000H 2003 07 DO D7 DO 2001 07 06 X X X X X X _ _ _ M 07 00 2002H 107 06 x X xxx 2003H 107 6 x Attack Attack Registor 00 1 95 MS 0 5 85 5 03 9 K 10 90 MS 180 11 270 MS Attack Decay Capacitor Decay 07 06 of 2003H 0 5 mfd R 1 1 5 mfd 0 O 2 MS 0 1 340 MS 1 0 213 5 1 1 1020 5 Resistor 0 37 00 173 180 10 35 Hz SLF Capacitor Ol 16 Hz 11 H O 1 mfd 1 1 mfd VCO voltage controlled osc register 0 1 O 1 12 K 00 330 01 10 667 Hz 388 Hz VCO Capacitor 005 mf Not Used Resistor 142 Fast 680 Slow Pilger 390 pfd white noise 01 mfd pink noise 7 d Sound Register 2800H 2803 D7 00 2800H 07 96 00 Select 0 External vol
11. OY Ut 4 N N LI LJ manus 2 1525 olus sign 7728 0 Ul H r4 3 gt O lt WO equal sign 25 ER 0 oS OW Ov 0 4 4 ni O I HC iq 13 FOF OY Ut Q semi colon UI 01 ly O J When some keys s essoc the last symbol in screen ls unrescocni28eaDls 5225 zarbaca 5755515 Genoese sk ears Lise 25 Single kev displays cont 2 60 7 7 X 62 78 X C 47 63 C V 64 76 V B 30 62 B N 54 6E N M 55 6D M comma 16 2 period 14 2E question mark space bar 01 20 backspace 04 08 lock MEE 05 2 22 2 The LOCK key display always begins with LOCK 05 The two groups of numbers which follow mav vary from test to test 30 2 LOCX Before oressing the keys listed below make sure the LOCX key is LOCK word LOCX is displayed on the screen on the Key Check test rh the screen throughout this section o the display varies according to the list below as each cf the rh e xevs is pressed After testing the kevs listed below depress the again and the word LOCK should disappear from the screen KEY PRESSED SCREEN DISPLAY double quotation marks 1
12. A D Conversion Sequence of Events 1 out 07 06 01 A D Sel Reset wait 40 uS out 07 06 10 A D Sel Release Reset wait 250 uS read counter 0 0 0V 232 11 950 js Page Memory Write 00000 EN Spare Spare 1000H mm Color 0 1 1800 Color 273 2000H Sound 0 2800 Sound 1 3000H Misc 3800 Spare System RAM Video RAM Program RAM Optional Program 2560 Bytes 499F Video Memory EY 09 5000 5632 8 Kb Basic System RAM Program 6000H 8 Kb Optional 7000H Program 8 Kb Optional System RAM Memory 8000H COOOH 32 Kb Expansion Memory FFFFH T LI Page 9
13. adviseable to try the unit with a different TV set Replace Replace Replace Replace Replace Replace Replace Replace Repair Replacement Procedure AC Adaptor Page 15 Upper Assembly Page 6 Main Electronics Page 15 Main Electronics Page 15 Main Electronics Page 15 Control Panel Sub assembly Page 12 Transport Sub assembly Page 12 Main Electronics Page 15 Clean Tape Head see Owner s Guide Align Tape Head Page 18 19 neplace Replace Replace Replace Transport Sub assembly Page 12 Main Electronics Page 15 Control Panel Sub assembly Page 12 Main Electronics Page 15 symptom Sounds not clear due to excessive hum TV Screen has inter mittent dots Unable to write informa tion back on tape Unit fails after short period of time Cassette door pops out of track It may be adviseable to try the unit with a different TV set Probable Trouble Location If TV set is properly tuned main electronics out of alignment or main electronics failure Intermittent memory RAM failure Read Write switch dirty Or Read Write circuitry faulty Main Electronics failure Cassette Housing Repair Replacement Procedure Main Electronics Page 15 Main Electronics Page 15 Transport Sub assembly Page 12 Main Electronics Page 15
14. cannot be read they will remain displaved the screen indicating kevsoard zallure revurza she west menu display azter noting anv faulty kevs depress the RESET button chen reload appropriate Test Tape 27 If the keyboard faulty replace the Control Panel Sub Assembly as described on page 12 Return the faulty Control Panel with completed Factory Service Tag Test 3 KEY This test is used in conjunction with Test 2 above to verify proper operation of the keyboard Begin by testing each single key on the following list As each key is pressed a beep can be heard and the display appropriate for the key appears on the screen according the list Observe the display as each key is pressed verifying that it matches the appropriate list entry If the display is incorrect or if the pattern blinks apears once and then disappears and reappears again a keyboard failure may be assumed After gt testing all single keys on the list test the LOCX SHIFT and CONTROL combinations on the list you encountar a keyboard failure note which keys or combinations nave 2 Replace the Control Panel Sub Assembly as described on page 12 Return the faulty Control Panel with a compieted Factory Service Tag Screen Disolavs for Test 3 KEY CHECR 1 Sinele cGlsolavs PRESSED SCREEN DISPLAY L0 2 27 33 212 30 N PH
15. fram burning out the chip 3 Make certain power is not applied when chips are removed or inserted 4 Carefully insert chip with the proper orientation 22 5V REG 12V REG E ELNA ELN 71 II e G lt lt 4 7 0 9m v 9609 Or ml EC 1 T 49909092 8 1 80 1 18 18 0 17 8 18 18 1 23 sed tees ame gt SOUND CHIP FIGURE 12 Electronics Sub assembly Top Plate Removed Test Tape Instructions The 8K and 16K Test Tapes contain integrated programs designed to thoroughly test the various subsystems of the InteractiM Model One Home Computer 8K and 16K Test Tapes differ only in the amount of random access memory RAM they check 8K Test Tape does not check the upper 8K bytes of RAM when run on a 16K system 16K Test Tape indicates a RAM ERROR when run on an 8K system Be sure to select the right Test Tape for the Model One you want to check Each Test Tape includes eight individual subsystem tests a combined test and a memory exerciser for continuous testing of RAM burning in RAM The Model One must be connected to a color TV for the proper performance of these tests See the Owner s Guide for instructio
16. handla is released ta the center position After testing all eight directions only the center square should remain yellow not attempt to change remaining scuares by moving the joystick handle in the aporooriate direction you are still unable to change a square the jovstick may be assumed detective 34 4 Depress fire button on the lert joystick The center square should turn white does not try the fire button two more times If the center square remains yellow the fire button may be assumed to be defective 3 Repeat the test ror the Joystick following steps 4 above The joystick test ends automatically when both center squares have been changed to white Therefore the operator should note any unchanged squares to record the nature of any joystick defect before pressing the hit button on the right joystick to whiten the last center scuare If you are unable to change both center squares signal that the test is complete by pressing the RESET button Then press R to make the test menu appear again either of the joystick controls fails try the test again with a new joystick I a new joystick also fails replace the Main Electronics Sub Assembly as described on 15 Return the faulty sub assembly with a completed Factory Service Tag Test 5 SOUND CHECK This test checks the audio subsystem of the Model One computer The computer displays PRESS FOR SOUND TEST
17. 022 single quotation mark 272777 dollar 5 61 26 24 5 percent sign 22 29 exclamation point 24 21 4 colon 23 left parenthesis 22 28 right parenthesis 21 293 less than sicn 12 3C lt greater than sign CIE Underscore 15 Dp arrow 3 55 25 kev ons Test eacn of the kevs listed below while not use the LOCX key for this portion of the Key Check test When Gepress the Shift key the word SHIFT is displayed on the screen remains as long as you hold down the kev The A D St of 7 according to the list below When ycu nave t si D t D all avs 115 53 release the Shift key and che word SHIFT will disappear Irom the 2L 5 mn LOCK neoleing down the 5512 Kev 26 vou SCS Sal KEY PRESSED DISPLAY double quotation marks 120252272 single quotation mark 6 dollar sign 26 24 5 percent sign 25 25 3 exclamation point 24 21 colon 23 3A left parenthesis 22 right parenthesis 210290 less than sign 12 lt greater than sign underscore o up arrow 17 35 4 Control kev Combinations Test each letter keyboard while holding down the Control xev D When you dress the Control key the word CONTROL arpears on the screen and remains until you release the key The rest of the display varies according to the list below The astarisk in the list below reorese
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19. Trouble Locator Chart on pages 4 and 5 This chart contains the most common symptoms of module failure and lists the repair aporcpriate for ach To confirm that a suspected module is faulty or to locate the cause of symptoms not listed the chart load and the Interactl 8K cr 16K Test Tape Iasftructiaoans for use of the test tapes begin on page 23 of this service marmal Once the serviceperson has determined that a module is faulty he should retra that module to the factory for repair and provide a Factory Service Tag to ac cumpany it An example of the Factory Service Tag is on page 3 of this manual It is essential that all items shown on the tag be filled out cmmietely Neve by Interact Electronics Inc Box 8140 Ann Arbor Michigan 48107 Faulty modules should be mailed to Interact Electronics Inc 2548 Packard Road Ann Arbor MI 48104 ATTN Service Dept parts of the Model system are identified in Figure 1 The remaining figures in this manual depict the disassembled modules The basic eight modules are as follows 1 Joystick assembly 1 of Figure 1 2 Antenna switch box 2 of Figure 1 3 power adaptor 3 of Figure 1 4 Lower housing sub assembly Figure 2 5 Upper housing sub assembly Figures 3 4 and 5 6 Control panel sub assembly Figure 6 7 Cassette sub assembly Figure 8 8 Main electronics sub a
20. he bottom of the screen indicating what color is being displayed Some TV s will equire adjustment of tne US Cne Il o Gistiay all L2 vou are unable 55 adjust to the crccer colors rzereatc the Color Check with a diffarant 36 If you still unable to a2 22 to the oroper colors the color generation izcultry may be assumed defective Replace the Main Electronics Sub Assembly as described on page l5 Return the faulty sub assembly with a completed Tractor Service Tag The last color display chosen remains for about two seconds then the test automatically terminates and the menu reappears the screen Test 7 READ WRITE TAPE TEST This test checks the ability of the Model One to read and write Gata patterns using the cassette tape Seltf explanatory instructions for performing this test are displayed on the screen as the test proceeds TOllow each instruction as it is displayed You will need a blank Data Tape During the test the computer writes a random data 300 on the tape Then the pattern is read back from the tape to verliv prope operation of the cassette deck 1 the test is performed correctly the computer Gisplays the message TAPE H the data are read or written incorrectly the computer displays TAPE ERROR When the test has been completed the test menu automatically reappears on the screen In the event of a tape error try the Tape Test again using diczzerenc Data Tape I a tape err
21. ns about how to connect the Model One to a TV set Loading the Test Tape Both Test Tapes ae loaded into the Model One in exactly the same way that any other program tape would be loaded Turn the computer on then initialize it by pressing the RESET switch The message DEPRESS L TO LOAD TAPE or DEPRESS L TO LOAD TAPE R TO RESTART should appear on the TV screen it does not the Model One is defective and should be returned with a completed Factory Service Tag for service Place the appropriate Test Tape in the cassette drive and close the cover firmly Depress the REWIND cassette button and type an L on the keyboard Allow a few seconds for the tape to rewind then depress the READ cassette button a few seconds you should hear 24 1 O O N I D fU 1 D t O 1 D I I ty owed fu 4 Oximately one minutes of 3 H Ui n th 0 3 ct 3 D F Q tt H y Fh ct D 1 3 D t v I 0 fv 97 D n g 25 Model One waits For about two se concs clears the screen 0 displays the test menu shown below SAIS T 0 CHECK 1 2 K3D CHECK 3 KEY CHECK 4 JOYSTK CHECK 52SOUND CHECK 6 COLOR CHECK 7 R W TAPE TEST 8 TOTAL CHECK 9 you are unable to load the Test perform the Head Aligmmene P
22. nts the unrzecognizeable symbols crinted at the and of each display Kee PRESSED DISPLAY Q 51 0 W 43 05 5 50 12 T 66 14 91 Lo U 51 7 I 41 09 SIOR p SO CL A 3101 8 S S7 9 D 46 04 3 44 06 32 gt Concrzol Key combina ions cent Ko 5 42 0 42 5 43 07 H 42 08 J 40 OA 57 0g L 2970075 2 60 X 6218 05 05 V 64 N 54 30 92 x M 55 After you have tested all keys in each list above depress the TAB ev The entire screen should go blank and the test menu should reappear on the screen If the TAB kev fails to clear the screen and return the menu keyboard failure may be assumed To return cto the menu display in the event of a key failure depress RESET button and oress an X 12 both TAS kev the Kev nave failed depress the RESET button anc reload tne appropriate Test 0 ct Cy O rq 3 H Q A OQ 21 1 MRIS test checks the Obperstich of joysticks and asScciated circuits During the test the screen displavs barometer bars representing J the joystick potentiometer knob settings anc two yellow scuares repre ovstick handles The left display corres 1 1 senting the position o the 9 Oy tic 5 ane 2 25 Oys 2 52 you
23. or occurs using the new tape replace the Cassette Sub Assembly as described on page 12 Return the aulty sub assembly with a completed Factory Service Tag 37 Test 8 TOTAL CHECK This test combines the first seven tests Tests automatically performed in numerical as listed on the test menu The total check eliminates the need to select each test separately from the menu Follow the instructions above for each test as it is run Test 9 MEMORY EXERCISER NOTE This test destroys the contents of RAM Test Tape will have to be reloaded to perform any other test following the Memory Exerciser B This program exercises the RAM extensively looking for address data and data address pattern related faults IZ RAM failure is encountered the screen blanks then turas red and the program halts no errors are encountered the test runs continually and therefore also serves as a method for burning in units which have had memory repairs or conversions After five minutes of successful operation vou assume that the RAM and associated circuitry ars functioning properly However two or more hours of continuous successful operation is recommended when using His SA in Unies 38 5 INO TIAN 1 77 77 e2 0 a sm FEO 2313
24. own in Figure 10 The following procedure must be followed for proper removal of top plate A First remove the six A screws shown in Figure 10 Next remove the four screws C Now carefully lift the small connector board about an inch away from the top plate D Tilt the left front corer of the connecter board down into the top plate hole E Move the top plate until the entire connector board is able to go through the hole F The circuit board is now open for general repairs The following repairs can be made by an authorized service center on the main circuit board A RAM replacements B Microprocessor 8080 replacement ROM 2316 replacement D Regulator replacements E Sound chip 76477 replacement Tuning RF section Cleaning read write switch ON OFF switch and LED replacement diagnostic ROM support jumper cables and repair data will be made available to those service centers who are authorized to make board repairs Repair Gata will include block diagrams schematics parts lists and waveform analysis to facilitate service repair Figure 12 shows the locations of most of the components mentioned above Care must be taken in removal handling and insertion of any chips on the board as follows 1 Remove chips with the aid of a chip removal tool carefully observing orientation before removal 5 2 Handle all chips with grounding strip on wrist to prevent static electricity
25. ransport housing see Ficure 11 When sound is heard through TV set adjust fine tuning of TV set for optimum sound quality 18 Rotate the screwdriver clockwise and counter clockwise while listening to the sound The sound should peak at maximum level within a quarter turn in either direction Stop ata point where the peak is reached Attempt to load standard Interact application cassette into the system See the Owner s Guide for details If the preceding alignment prccedure has been accomplished correctly and the cassette is not defective no further loading difficulty should occur Since the head alignment screw will move with usage and time it is best to place drop of liquid screw tight e g on the screw head and mating surface This can be accomplished by removing the cassette tape and pressing the READ button This moves the head towards the door opening Now with a mirror and a small brush a drop of liquid screw tight can be applied to the screw head surface 20 ec m AV gt p FIGURE 11 Aligning Cassette Tape Head Service Manual Addendum Circuit 686 Repairs After following the disassembly procedures of sections 1 through 5 certain further repairs can be made by factory authorized service centers These repairs require removal of the metal top plate from the Main Electronics Sub assembly sh
26. repeat the test a second time the vesllcw squares barometer Dars will ge Black Tasting should 22569266 2211095 23 A l Slowly rotate the left joystick sotentiometer knob As the knob is rotated counter clockwise the left barometer should Segin te gill 5 with yellow When the knob is fully rotated in tee councer clockwise direction the entire bar should be yellow When the knob is rotated clockwise the yellow barometer bar should fill in black I the bar 7 does not change colors as described the votentiometer may be assumed defective 2 Test the left joystick handle in each of the directions corresponding to up down left and right For each direction press the handle for a few seconds in that direction then release it to the center upright position As you hold the joystick in a given position a small black square should appear in the yellow square corresponding to the current 4 position of the joystick When the handle is returned to the center 2 cosition the black square should tum white it does not repeat the test for chat direction After two or three unsuccessful attempts joystick may be assumed defective 3 Now test the left joystick handle in each of the four diagonal direc tions corresponding to upper right lower right lower left and upoer le tty oroceeding as outlined in step 2 above Corresponding black scuares Should appear as described above each turning white as the
27. rocedure described Section 6 0 of Gis service manual The purpose of each of the above tests is described in the following ies the test vou desire The test begins automaticaliv after th you Dress a number on tne keyboard n2 Ul Test 0 ROM CHECK This test automatically checks the read only memory ROM and its associated circuitry A checksum is computed by adding together the contents of successive memory locations The resultant sum is compared to a value contained in the ROM test orogram I the computed checksum is correct the menu is again displaved on the Screen If the sum if incorrect the message ROM ERROR appears on the screen and remains for approximately two seconds before the menu is displayed again If the ROM is faulty replace the Main Electronics Sub Assembly as described on page 15 Return the Main Electronics Sub Assembly with a completed Factory Service Tag further tests can be performed if the ROM is not 0 properly 1 CZECK This test automatically checks the random access memory RAM and its associated circuitry The Model One writes four dizzerent cata Dattarns into each RAM location then reads them back a data pattern is not read back correctly the message ERROR appears on the screen for approximately two seconds chen the test menu is displayed again the correct data patterns are read back for each memory Location no message i
28. s displavec and the menu reascears the screen RAM is faulty replace the Main Electronics Sub Assemblv as described 15 Raturn the Sub Assemplv with A a completed Factory Service Tag No further tests per zormed 7 26 3 1815 conjonction Ces 3 Below LCV kewooard xev and 155 151112777 When is 550862 patter the with the 3939897952326 symbol for each key is displayed on the screen Proceed as follows 1 Press the left 55125 key then the right 55 25 kev 2 927695 the left commer or the space Dar che right 3 Press each remaining key on the keyboard one kev at a time AS each key is pressed 155 corresponding symbol on the screen is blanked out with white scuare During the 5 756378 cheek operator should observe that the proper symbol is blanked out as each key is depressed a fault exists it is sossible for the computer to read the wrong code for a kev and therefore blank out the wrong symbol on screen This type of keyboard error can only detected 57 ODserving chat roper Symbol is Slenkes as is depressed When kevs seen 5565 55593117 ewo secona 6 noise be heard then the program returns to the test menu displav I or keys
29. ssembly Figure 10 FACTORY SERVICE TAG Service Center Name Service Center Address Date Sub Assembly Upper housing Main electronics Check One Lower housing AC adaptor Cassette Joystick Control panel Antenna switch box Symptom Date of Purchase Interact Model One Serial Memory 8K 16K _ _ Check One Shipping Instructions Pack faulty modules carefully in secure packaging to prevent damage during shipment Fnclose separate Factory Service Tag for each module Be sure that specific symptom is noted on tag Mark shipping carton FRAGILE Never mail modules by parcel post Faulty modules should be mailed to Interact Electronics Inc 2548 Packard Road Ann Arbor MI 48104 ATTN Service Dept Symptom Probable Location No picture or sound and AC Adaptor no pilot light Or ON OFF switch No picture or sound but Main Electronics Sub Assembly light is on Poor picture and or sound If TV set is properlv tuned main electronics out of alignment No color If TV set is properly tuned main electronics clock out of adjustment or main electronics failure Cassette transport doesn t Control Panel Sub assembly run Or Motor faulty Or Motor not getting voltage Cassette tapes don t read Tape head dirty properlv Or Tape head out of alignment or Transport mechanism binding Or Read circuitry faulty Keys on keyboard fail to Keyboard faulty Function Or Main electronics faulty Tt may be
30. tage source SLF Noise Filter Resistor 0 77 1 330 K 1 07 00 2801H 07 06 X X X X X X One shot sound terminated 0 sound enable attack begin decay Volume 0 Normal Volume 1 2 Volume 07 00 2802H 07 6 E 242 System enable 0 enabled 1 inhibited Envelope select 1 one to zero transition triggers the one 07 00 shot to begin the attack with bit D6 In 07 106 x X X X XX 2801H set to O e VCO Ext control 0 1 4 Sm pe select 2 Envelope Select 652 51 0 0 VCO 0 11 One Shot 1 0 Mixer Only 1 1 VCO With Alternating Cycles 8 e Miscellaneous Output Register 3000H 07 DO Audio Mixer select 000 VCO 001 Noise 010 SLF Noise 011 SLF VCO 100 SLF 101 VCO Noise 110 SLF Noise VCO 111 Tape Sounds to Audio hane 000 Ground 001 ANLA Analog Left A Fire Button 010 ANLB Potentiometer 011 ANLC rc Spare 100 ANRA Analog Right Fire Button 101 ANRB Potentiometer 110 ANRC C Spare 111 VREF For tape write set bits to VREF Counter Function 00 Tape input select 10 A D start conversion 11 No function 01 A D reset counter
31. tebivsw ev nagie CED CEAD an CED aor CEA pup umm mTL a rw t PA 177 EN amp a u 2 17 LINO I Irwin Y 2711 lt 1 118 mM 060002 71 mM 0 99 3 wd 2224 4141 2671 2 fo s to xto 1 word wor rb t atw 20 vio me bs E n a go cav AL 1119 on Ly NO 112 d Tue viu CTD te 03 ce m arro 022 v Memory 1 0 Map Pages OOOOH 4O00H 8000H 1000H 2 4 Kb ROM System 1 0 System RAM 16 Kb Expansion RAM 16 Kb Expansion RAM Page 0 Page Page 2 Page 3 Page 0 System ROM 1 0 Map T Memory Read 0000H ROM A 08000 ROM 1000H Spare Spare TTT 2000 Spare 2800 _ 3000H 000 RTC A D Data 3800H KBD JSTK Data 5 15 78 Revised eee P FFF 56 Fo 20 wr 16
32. wes 427 INTERACT MODEL ONE HOME COMPUTER SERVICE MANUAL 2 NTERACT Table of Contents Page TH EE bla ao 102 21 11 1 1010 1010 4 Upcer Assembly and Imstajllatio n 6 Control Panel Sub assembly Removal and Installation 12 Cassette Transport Sub assembly Removal and Installation 12 AC Power Adaptor Sub assembly Removal and Installation 15 Main Electronics Sub assembly Removal and Installation 15 Head 2 2 2 2555252 0 42 0 gt 42224 18 Service Manual Addendum 995 5 9 21 ROuBIES Test ao 995 255 19959 94 24 1979 by Intercet Electronics nc Introduction In order to facilitate rapid diagnosis and repair of the Model One Home Computer Interact has designed the system as an assenbly of eight sub assemblies modules Each module contains the components which perform a specific system function The serviceperson s responsibility is to identify the faulty maule and replace it No further repairs should be attempted at the service center All faulty modules are to be returned to the factory with a completed Factary Service Tag The process of identifying a malfunctioning module is simplified by the use of the
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