Ensoniq SQ 0 Service Manual Dipl. Inform. Rainer
Contents
1. f Press the SEQ button select the sequence you created using the ap propriate soft button g Press the CONTROL button select COUNTOFF and set it to CLICK h Press PLAY and listen for the metronome countoff click LS m Allow the sequence to play for a short time to verify that the sequence data is not scrambled j Press Stop ConrT to stop the sequence Failure to retain internal programs and sequences may require the addition of a ferrite bead see Appendix K If the unit already has a ferrite bead failure indicates a main board problem Failure to hear the metronome indicates a main board problem 2 Memory Backup Test a Select the sequence that was created above Turn the unit off b Wait 10 seconds 18 CHAPTER 2 TROUBLESHOOTING GUIDE c Turn the unit on Verify that the sequence is retained Failure to retain internal programs may require the addition of a ferrite bead see Appendix K If the unit already has a ferrite bead failure indicates a main board problem A really big problem Get a 3 6V solder in battery and replace the SQ80 s internal battery 3 Analog Input Test a While holding down the RECORD button press the COMPARE button b Repeatedly press the READ soft button and verify each of the fol lowing 1 PTCHreads a between 110 and 150 when the pitch wheel is centered b 30 or lower when pitch wheel is down c 220 or higher when pitch wheel is up a 0 when the2. 2 4 Testing the Power Supply unloaded 2 5 Display Self Test Mode 2 6 Using Self Test Mode to Diagnose Keypad Display Assembly 2 7 SQ80 Test Procedure 2 8 Hardware Notes s 2 sun du ua a Rw ee Replacing the Main Board Replacing the Keypad Display Board Replacing the Keyboard Replacing the Power Supply Replacing the Transformer Replacing the Pitch Mod Wheel Assembly Replacing the Line Filter Replacing the Operating System EPROMs Replacing the Keyboard KPC EPROM Replacing the Disk Drive Adding a Ferrite Bead aN x 10 10 13 13 14 15 16 16 18 19 24 26 27 28 30 31 32 33 34 35 37 38 4 CONTENTS BP ta uan sowo um TO DISPLAY BOARO 42 POWER SUPPLY BOARD TRANSFORMER Figure 1 SQ80 Exploded View Chapter 1 Important things to know about the SQ80 While the SQ80 is similar to the ESQ 1 in many ways there are some major differences between the two units Jf you don t read any other part of this manual read this section The following information details these differences 1 1 The keyboard The poly pressure keyboard is a complex module which contains its own computer and software For this reason when necessary you will be swapping it out as a while unit Display information to the Main Board is processed through the keyboard so what might appear to be a frozen display could
3. to transformer to harness i L Part Number screened here to display Figure 2 2 Power Supply Voltage Check Points The following chart lists the voltage ranges for proper operation of each supply fully loaded and the appropriate terminals to read across with the voltmeter refer to figure 2 3 for terminal locations 14 CHAPTER 2 TROUBLESHOOTING GUIDE Designation Terminals Connector Range Digital Supply 15 to 19 Analog Supply 23 to 29 5 Display Filament 8 5 to 11 5 Display 4 8 to 5 25 5 Digital 2 4 8 to 5 25 Vres 2 7 to 5 25 12 Analog 11 4 to 12 6 VU 8 to 11 12 Analog 11 4 to 12 6 5 Display 4 8 to 5 25 Vbb 3 45 to 55 12 Analog 11 4 to 12 6 Filament 7 8 5 to 11 Display Offset 7 8 to 11 5 Digital 3 4 8 to 5 25 12 Analog 11 4 to 12 6 Table 2 1 Voltage Ranges 2 4 Testing the Power Supply unloaded If the power supply readings exceed the indicated tolerance particularly the 5 Digital line btween terminals 12 and 13 it is possible that a defective compo nent on the main board is drawing the power supply down In this case you should test the power supply unloaded before proceeding To do so follow this procedure Turn the unit off and remove the three connectors on the right side of the power supply leaving only the connector from the transformer attached Volt ages should read as in the chart above If these read
4. Ferrite Bead a EE Power Suppy Transformer Figure K 1 Ferrite Bead Location 36
5. SQ 80 SYNTHESIZER SEQUENCER SOFTWARE VERSION X XX YYY X XX indicates the main operating system version YYY indicates the keyboard operating system Units with serial numbers less than 500200 may have a keyboard operating system version lower than 150 If this is the case get the latest version and replace the EPROM as described in Appendix I The latest software versions are 1 80 for the main operating system and 150 for the keyboard operating system 1 2 The disk drive While the SQ80 disk drive is similar to the one used in the DSK 1 its major difference is that it its double sided Two different drives have been used in the SQ80 SQ80 Serial Voltage Drive Part No Distinguishing Feature 500001 500630 220V Panasonic JU 364 8622999492 Red LED 240V drive light no door 500630 latest 220V Sony 63W 00D 9722000501 Yellow LED 240V drive light door Important difference between the Sony and Panasonic drives The Panasonic JU 364 and the Sony 63W 00D use different 34 pin ribbon cables This is due to the fact that the pin out on the Sony drive is reversed from that of the Panasonic It is therefore important to note the serial number of the unit and to have this information handy when ordering a replacement drive When possible install an identical replacement drive This will avoid you having to replace the cable as well Ensoniq plans to replace the current SONY64W 00D disk drive with a Panasonic JU 253 P N 9722000601 lik
6. Voltage or part num printed here Some transformers have the green leads here Figure 2 1 AC Line Voltage Check Points AC line voltage measurements e With the power switch off the proper AC line voltage should read from 2B 1A 2B 2A 2B 3B 2 3 POWER SUPPLY MEASUREMENTS 13 e With the power switch on the proper AC line voltage should read from 2B 1A 2B 1B 2B 3B 2B 3A There should be no voltage across the power switch 2 3 Power Supply Measurements On SQ80 systems designed for 220 240 VAC operation there is only one proper power supply transformer configuration This configuration is denoted by both the label on the top of the transformer and the part number silk screened on the lower left of the power supply PC board The proper transformer power supply configuration for the SQ80 is Transformer labelled 1450000512 220 240V and power supply labelled 4001008101 If you suspect a problem with the power supply and the labels on the trans former and power supply do not correspond to the above configuration contact the Ensoniq customer service dept for instructions In fact this is pretty useless nowadays j e F4 2A 250V e e F3 2A 250V 1 5A 250 gig e FI 1 5A 250V B e i OTOTOTOTO 7 1 5A 250V 8 J2
7. b Using the data entry slider move the pan value to 0 and play more than 8 notes There should only be sound coming from the left channel Move the pan value to 15 and play more than 8 notes There should only be sound coming from the right channel c d Unplug the left output and play notes while moving the pan value up and down There should only be sound coming from the right channel and adjusting the pan setting should have no effect Failure indicates a main board problem 20 9 10 11 CHAPTER 2 TROUBLESHOOTING GUIDE Tape Output Test Note The tape interface on the SQ80 is very level sensitive We recom mend that a good quality tape deck with variable output control be used and that levels be set at 0 dB for best results Also be sure to switch off any noise reduction see Hardware Notes on page 25 a Connect the Tape Out jack to the input of the tape deck Rewind the tape c Press the STORAGE button and select TAPE then SAVE Start the tape deck recording and then select INT BANKS If no level shows on the tape deck meters check your connections and level settings If any signal is recorded on the tape it is safe to assume that the tape output is working correctly e After 50 seconds the display should return to normal f Rewind the tape Failure usually indicates a main board problem Tape Input Test a Connect the Tape In jack to the output of the tape deck b While
8. front of the board toward the keyboard and then lifting it up so that the heat sink clears the case 6 Before replacing the power supply board first make sure that the insulator pad is in place The standoffs are intended only for support and should not be stuck down to the case 7 Reinstall the power supply scres and lock washers and be sure to connect the ground wire from the line filter Carefully reconnect the three cables paying particular attention to the alignment of pins and connectors 8 Power up test the unit and close the control panel 28 Appendix E Replacing the Transformer Due to problems that may oocur with the plastic case all units that need the transformer replaced should be sent back to the Ensoniq office Again a really useful hint 29 Appendix F Replacing the Pitch Mod Wheel Assembly The Pitch and Mod Wheels are preplaced as an assembly along with the cable harness 1 2 Remove all cables connected to the Q80 including the power cable Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts Place the unit upside down on a soft surface and remove the four screws that attach the wheel assembly to the case See figure I for location of SCTEWS Return the unit to an upright position Cut the wire ties that hold the wire harness to the chassis Disconnect the harness from the main board from the
9. in a box packed with peanuts If you must wrap the entire unit in plastic first These peanuts may cause severe damage to the disk drive keyboard or cartridge port What diskettes to use It is very important to use double sided double density 3 5 micro floppy disks The SQ80 writes information to every track on a disk so it is imperative that the disk be of superior quality and certified for double sided use Since double density disks are hard to get nowadays Yes it is ok to use high density disks instead Testing the disk drive The best way to test the disk drive is by formatting a disk When a disk is formatted the SQ80 reads and writes every track on that disk If the formatting attempt fails it is likely that the disk itself is faulty Always try formatting another blank disk before determining that the disk drive is faulty Unlike many computer systems the SQ80 does not automatically discard bad sector The entire disk must be good for successful formatting The disk drive shield You will find that there is a metal plate located on the bottom of the disk drive see figure The function of this plate is to keep the 34 pin rippon cable from interfering with the disk drive motor When replacing the disk drive it is important to transfer this metal plate to the new drive The 8 CHAPTER 1 IMPORTANT THINGS TO KNOW ABOUT THE SQ80 plate is attached with two screws and accompanying star washers This plate must be installed
10. instead be a bad keyboard Also what might appear to be a bad keyboard display stuck at calibration page might instead be caused by scrambled RAM in which case the memory needs to be dumped For more detailed debugging hints see the flow chart on page 12 and hardware notes on page 24 Be sure to have the serial number of the unit ready when ordering a replacement keyboard Weights The weights inside the white keys of some early units have tended to fall out and roll about in the case If that happens simply glue the weight back into the key with super glue gel Cables When reconnection the keyboard cable to the Main Board make sure that the red line on the cable is on pin 1 and that the cable is not mis pinned If the cable zs mis pinned or backwards fuses F3 and F4 will blow and cause the display to come up blank Note that if either fuse blows you will need to replace both fuses as one will blow the other Shields If the keyboard you are replacing has a keyboard shield on the bottom see figure for location and the replacement keyboard does not remove 6 CHAPTER 1 IMPORTANT THINGS TO KNOW ABOUT THE SQ80 the shield from the old keyboard and install it on the new one For more detailed instructions see Appendix C Software The keyboard has its own operating system EPROM KPC which is located on the PC board on the bottom of the keyboard When you hold down the RECORD button and press the MASTER button you will see ENSONIQ
11. is now too high Try level between the two Of course the above messages may mean just what they say Appendix A Replacing the Main Board 1 Remove all cables connected to the Q80 including the power cable 2 Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts 3 Remove the keyboard and metal main board shield see Appendix C Note that you should remove the 20 pin ribbon cable from the main board at J3 instead of from the keyboard 4 Remove the seven nuts from the rear panel jacks marked Sustain Ft Sw Sequencer Ft Sw Tape Out Tape In Pedal CV Left Headphones and Right Audio Out 5 Remove the Program Cartridge cable J2 from the main board Remove the seven self tapping screws from the main board and the one ground screw with star washer see page 10 Important things to know about the SQ80 Ground wires ground inserts 6 Before installing the new circuit board make sure the cardboard insulator is in place 7 With the board tilted on a slight angle insert the jacks into the holes in the rear panel Press the board down into place 8 Replace the main board scres and secure the jacks with the nuts Connect the program cartridge cable and the keyboard cable 9 Reinstall the keyboard and metal shield see Appendix C 10 Power up test the unit and close the front panel 24 Appendix B Replacing th
12. mod wheel is down at least 240 when wheel is up 3 KNOB moves from 0 to 255 when the data entry slider is moved 4 PED moves from 0 to 255 when the pedal is moved 5 BAT reads 0 2 MOD reads on c Make sure the pitch wheel is not being held off center and press READ one more time Failure on this page indicates a problem with the corresponding part although it could also indicate a power supply failure or a main board problem If all the readings are off then it is most likely that there is a problem with the main board 4 Sustain Jack Test Plug the foot switch into the Sustain Ft Sw jack and verify that notes sustain when the switch is depressed and follow their normal decay when it is released Faulure indicates a main board problem or a poly pressure keyboard prob lem 5 Sequencer Jack Test Plug the foot switch in to the Sequencer Ft Sw jack and verify that you can start and stop the sequencer with alternate depressions of the switch Failure indicates a main board problem or a poly pressure keyboard prob lem 6 Cartridge Test a Insert an EEPROM storage cartridge into the Program Cartridge slot b Press the CART A button and verify that all four banks can be se lected and that none of the names are garbled 2 7 SQ80 TEST PROCEDURE 19 c Repeat step b for CART B d Press the WRITE button and then select the soft button above YES e Select a location in memory to store the selecte
13. of the SQ80 Power up re initialize the system and tune the filters Check the software version level by holding down RECORD and pressing MASTER Reinstall the metal main board shield if present Test the unit and then close the front panel 32 Appendix I Replacing the Keyboard KPC EPROM 1 Remove all cables connected to the SQ80 including the power cable 2 Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts 3 Remove the six scres that fasten the metal main board shield of present to the case and keyboard frame See page 10 Important things to know about the SQ80 Main Board and Shields Disconnect the keypad display cable J4 the power cable J11 and the wheels cable J12 from the main board Remove the metal shield from the unit 4 Place the unit upside down on a soft surface Remove the ten screws that attach the keyboard to the case 5 Carefully turn the unit right side up REmove the keyboard from the case by gently lifting the front of the keyboard while pulling it toward the front of the unit Once the rear of the keyboard has cleared the control panel mounting tabs the keyboard can be turned over 6 The KPC EPROM is in lcoation U2 of the KPC board the small PC board on the bottom of the keyboard Carefully remove the EPROM and insert the replacement EPROM into the socket Be sure the notch in the E
14. to ensure proper operation of the drive 1 3 Ferrite Beads On later units a ferrite bead was added to the wires from the transformer to the power supply to prevent possible memory loss on power down This ferrite bead should be added to any earlier unit that seems to have a problem with memory loss See Appendix K for more details on how to install this ferrite bead On units with approx s n 500890 and higher the ferrite bead is already installed in the factory 1 4 Main Boards and Shields Main Boards There are two versions of the main board used in the SQ80 When you are swapping a main board it is important to complete the replacement with an identical board You can distinguish the two boards by taking note of the part number which is screened near the center of the board e Part number 4090008001 needs main board shield and keyboard shield e Part number 4090008002 does not need shields On units with approx s n 500890 and higher main board 4090008002 is used If a unit has shields make sure to put them back in If the unit does not have shields do not add them Shields The main board shield and the keyboard shield are shown in figure In some units these shields are attached using tinnerman clips with the screws Be aware that these clips may fall off when disassembling a unit Don t lose them Ground wires On some earlier units a ground wire was attached to the ground square on the main board which in turn
15. 0 pin keyboard cable from the main board at J3 then use a clip lead to connect pins 19 and 17 of J3 together Pins 19 and 17 are the uppermost two of the right tow of pins on J3 Power the SQ80 on If the sign on message appears this indicates that the keyboard is at fault If the message does not appear and the main board has been pre viously hard re initialized this indicates a main board problem 2 1 Internal Memory A given Q80 is likely to have program and or sequence data in its internal memory that is near and important to the owner of that unit In the event that it becomes necessary to re initialize the memory during repair it is highly recommended that the internal memory both programs and sequences of the unit to be saved to disk before servicing See the SQ80 Musician s Manual for full instructions on saving program and sequence data The SQ80 is essentially a computer with over 80K of memory It is pos sible for the SQ80 to become confused if bad data is loaded into its memory This can result from loading data off of a bad disk or not clearing out the system memory after a MIDI SysEx transfer If the memory does get scrambled it will be necessary to re initialize the system For this reason periodic backing up of all program and sequence data and re initialization 1s recommended 2 1 1 Checking the Power Supply Many SQ80 problems may be related to a faulty power supply transformer or line filter You should check th
16. Ensoniq SQ80 Service Manual Dipl Inform Rainer Buchty November 10 1999 Abstract This document is based on the original SQ80 Service Manual which turned out to be hard to get I was lucky getting a copy from somebody who sells copies of service manuals for a huge variety of electronic instruments however the price of almost US 25 for just copying is pretty ridiculous especially if the copies aren t of a very good quality So I decided to re print this manual All graphics except the exploded view were drawn and not scanned the text was typed since the copy s quality was too poor to make use of OCR software l ve made a few additions to the original text To separate this I ve written it this way And remember Whenever the text reads something like send back to Ensoniq forget it Ensoniq has dropped support for ESQ 1 and Q80 completely Contents D fo 4 Baw gt Important things to know about the SQ80 1 17 Che keyboard 3 Sar ER Se SR AUS A ee era 12 Ihe disk drive ois 22 2 SO ia un aa eet 1 3 Ferrite Beads 1 4 Main Boards and Shields 1 5 Plastic Cases 2 2 2er ae Bee ee ees ed A Troubleshooting Guide 2 1 Internal Memory 2 1 1 Checking the Power Supply 2 2 Transformer and Power Supply Voltage Check Points 2 3 Power Supply Measurements
17. PROM is facing the same direction as the other chips on the KPC board 7 Power up re initialize the system and tune the filters Test the unit to make sure the keyboard is working properly 8 Turn the unit off and turn it upside down on a soft surface to replace the ten screws that secure the keyboard to the case 9 Turn the right side up Replace the four scres that attach the metal main board shield if present to the keyboard bottom shield CLose the front panel 33 34 APPENDIX I REPLACING THE KEYBOARD KPC EPROM Front of Case Keyboard Side j Wheel Keyboard Assembly Screws Screws Figure I 1 Bottom of Case Appendix J Replacing the Disk Drive 10 Remove all cables connected to the SQ80 including the power cable Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts Turn the unit over top down and remove the four scres that attach the wheel assembly to the case See figure I for location of screws Return the unit to an upright position Carefully lift the wheel assembly out of the case Disconnect the two cables from the disk drive paying particular attention to polarity See page 8 Important things to know about the SQ80 The Disk Drive Remove the four scres and star washers that attach the disk drive to the wheel assembly Carefully slide the disk drive out of the w
18. art on page 12 2 If the display is blank and remains blank not in self test mode turn the unit off open the front panel and disconnect the four wire connector from the keypad display board This interrupts communications between the main board and the keypad display board Close the lid and turn the power on If the unit now enters the self test mode this indicates a main board or keyboard problem If removing the four wire connector from the keypad display board does not activate the self test mode assuming all power supply voltages checked out properly this indicates a faulty keypad display board 3 If the unit is in self test mode but the display does not respnd according to the above chart the problem is most likely in the keypad display board If certain buttons do not function properly during normal SQ80 operation test them while the unit is in self test mode If the same buttons do func tion properly in self test mode then the problem is most likely scrambled software the unit will need to be re initialized as outlined in step 14 of the SQ80 test procedure 4 If the sign on message appears but the SQ80 doesn t respond to button presses try re initializing the unit as described in step 14G of the test procedure If this doesn t correct the problem the keyboard is most likely at fault 2 7 SQ80 TEST PROCEDURE 17 2 7 SQ80 Test Procedure The following procedure will ensure the thorough testing of the SQ80 and wil
19. d program f The display should respond WRITING NEW PROGRAM and return to normal with no error after approx 4 seconds Check all cartridge banks and pages for correct name data g Remove the cartridge Failure usually indicates a main board problem Check the cartridge cable however to see that it is installed correctly stripe at pin 1 and that none of the connectors pins are offset or bent under Note In some cases a defective main board can garble the contents of the storage cartridge If this happens reload it from a known good SQ80 by copying the data from a good cartridge over the garbled data See the SQ80 Musician s Manual for details 7 Keypad Test a After pressing INTERNAL press each soft button to verify that the appropriate program name gets underlined b Press each button in the VOICE section and verify that they select the proper pages The name on each page which corresponds to the button pressed appears in the upper left corner of the display c Test the sequencer transport controls RECORD START STOP and PLAY to verify the proper operation d When on the Locate page press the up arrow key The tempo should increase Press the down arrow key The tempo should decrease Failure most likely indicates a problem with the keypad display board Main board and keyboard problems however also affect the keypad func tion 8 Stereo Test a Press the DcA4 button and select PAN
20. d soft button 7 Press CART A then hold down the proper bank button and press soft button 7 Three button presses in any order are needed to tell the SQ80 what to select This work around just changes the order in which the three buttons are pressed 2 8 HARDWARE NOTES 23 4 Tape Tips When saving data to a home type deck with level controls and VU meters make sure the record level is high enough right near 0dB seems to work best Too low a record level will bury the data in tape hiss When loading wait 4 to 6 seconds into the leader tone before pressing the Q80 button that starts the procedure This lets the tone settle out and lets the recorder get up to speed If the recorder doesn t have a level meter listen for the leader tone before starting tape load operation When loading from a recorder that has a tone control make sure it is in the flat position Lots of treble boost or cut will distort the pulse waveforms on the tape TAPE NOT STARTED ON LEADER TONE may mean the level is too low FATAL ERRORS DETECTED ALL INTERNAL MEMORY RESET may mean the level is too high Generally the correct input level will fall in between the levels which yield the above messages If you get the TAPE NOT STARTED ON LEADER TONE message and you know that the tape was started on the tone then the level is too low If you then increase the level and get the FATAL ERRORS DETECTED ALL INTERNAL PROGRAMS RESET message the level
21. e Keypad Display Board 1 Remove all cables connected to the SQ80 including the power cable 2 Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts 3 Remove the six wire and four wire cable harnesses located on the left side of the keypad display board Note that they are keyed 4 The individual coloured buttons are held in place only by the key boad display board underlay To prevent them from falling out when the board is removed make sure the control panel is open all the way If not well I hope you like Puzzle games 5 Remove the 21 screws that hold the keypad display in place and carefully remove the keypad display Remove the cardboard insulator if present that covers the bottom of the keypad display board 6 To reassemble first make sure that the Insulator and all the buttons are in place Make sure that the eight display lens retainers are in the proper position and that the lens is clean 7 Install the new keypad display board with the cardboard insulator if present using the 21 screws Reconnect the wire harnesses paying at tention to polarity Reinstall the knobs on the data entry and volume sliders 8 Power up test the unit and close the front panel 25 Appendix C Replacing the Keyboard 1 Remove all cables connected to the Q80 including the power cable 2 Remove the four screws that fasten the control pa
22. e the JU 364 This will be effected on units approx s n 501770 and up The new drive is distinguished by a red LED drive light Unlike the JU 364 however there is a door over the drive opening The 34 pin ribbon cable used with the JU 253 is the same one that is used with the Sony 64W 00D 1 2 THE DISK DRIVE 7 Mounting holes The wheel cover assembly has three sets of standoffs to mount the disk drive see figure This allows the use of both Sony and Panasonic disk drives The Panasonic uses the first and second standoffs for its mounting holes counting from the front of the wheel cover and the Sony uses the first and the third For more details on replacing the disk drive see Appendix J Transporting a unit Some of the units may be shipped with a protective plastic yellow sheet inserted in the disk drive You must remove this sheet before powering on the unit There is a printed label covering the disk drive on every new unit shipped This label contains important information concerning the care of the Q80 disk drive and lists recommendations regarding the treatment of the drive during transport To reiterate It is not under any circumstances recommended to insert of an actual disk during transport nor is it recommended to use a cardboard disk sheet in place of plastic ones Transport the unit only with either a plastic sheet in the drive or nothing in the drive at all Please do not ship an SQ80 or replacement disk drive
23. ese before trouble shooting the rest of the unit 11 12 CHAPTER 2 TROUBLESHOOTING GUIDE Using a 2 mm Allen wrench remove the four screws securing the front panel and raise the panel Check to make sure that all the connections are secure and correct Plug the Q80 in and turn it on After the SQ80 has warmed up for five minutes begin to test the voltages at the points shown in figures 2 2 and 2 3 If the voltages vary outside the allowable limits follow the procedure described under Testing the Power Supply Unloaded before replacing it 2 2 Transformer and Power Supply Voltage Check Points The proper AC line voltage for each Q80 should be printed on the top of the transformer Figure 2 2 shows the check points for reading the AC line voltage Figure 2 3 shows the connector terminal numbers and correct voltage values for the power supply and transformer It is normal for line voltage to vary 10 Back of Unit ob 3 m Top Lug Power Sw 5 Line Fuse nee 8 R gt not Filter Holder 18 Warning ae i eae LGN There are dangerous voltages present Suc See in this area as well as in the power Top Lug ithe BER a supply and display board 2A IB LIA 4 IN Bottom Lug yellow brown to power supply Let red red yellow brown O a black white lt orange Green Primary Wire Proper AC
24. heel assembly Remove the two screws and star washers that attach the metal plate to the bottom of the disk drive Immediately place defective drive in the anti static bag that the new drive came in Attach the metal plate to the new disk drive using the two scres and star washers Slide the new disk drive into place and mount it using the four screws and star washers Reconnect the two cables paying particular attention to the alignment of pins and connectors Reattach the wheel assembly to the case using the four screws Power up test the unit and close the control panel 35 Appendix K Adding a Ferrite Bead A ferrite bead should be added to any unit that doesn t retain its internal memory reliably 2 Remove all cables connected to the SQ80 including the power cable Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts Carefully surround the nine wires that lead from the transformer to the power supply J1 with both ferrite bead halves Tape both halves in place with electrical tape then use the supplied heat shrink tubing to secure proper insulation Use a tyrap to keep the ferrite bead as close to the power supply connector J1 as possible Test for memory retention as described in the SQ80 test procedure steps 1 and 2 on page 19 Close the front panel Jl Back of Unit
25. holding down the RECORD button press soft button 1 c Answer YES to re initialize the system see Re Initialization of Unit step 14 d Press the STORAGE button and select TAPE then LOAD e Start tape playback and after the leader tone appears on the tape deck s level meters select INT BANKS f After approx 50 seconds the display should return to normal with out error g Press the INTERNAL button and select each bank to verify the pro gram names have not been scrambled If the tape input on the main board is not functional the message TAPE NOT STARTED ON LEADER will always appear If the tape loads for a while and then the display reports FATAL ERRORS DETECTED it is highly unlikely that there is a problem with the main board It is much more likely that the tape level is not set properly See Tape Tips Hardware Notes page 25 Filter Tune a While holding the RECORD button press the FILTER button b The value for each filter will be displayed sequentially Verify that all numbers are above 140 Failure indicates a main board problem 12 Sound Test a Select your favourite patch with velocity and pressure sensitivity and play 2 7 SQ80 TEST PROCEDURE 21 13 14 b Play all of the keyboard keys and check for velocity sensitivity and pressure c Adjust the volume slider to make sure it has the appropriate effect on volume Failure usually indicates a main board or volume slider pr
26. ings are normal when the supply is unloaded then a problem with the main or keypad display board is usually indicated 2 5 Display Self Test Mode When the keypad display is receiving power from the pwoer supply but is not in proper communication with hte main board the Q80 enters self test mode In this mode the display remains blank until you press the buttons on the front panel Pressing various front panel buttons will cause the display to print characters underscore characters clear the screen etc The following chart details how the front panel buttons are mapped in self test mode Press Display reads SEQ 9 CART Down arrow Continued on next page 2 5 DISPLAY SELF TEST MODE 15 continued from previous page Press Display reads CART B Internal BANK 1 BANK 2 BANK 3 BANK 4 ENV 2 Compare Up Inc Down Dec Write Soft Button 1 Soft Button 2 Soft Button 3 Soft Button 4 Soft Button 5 Soft Button 6 Soft Button 7 Soft Button 8 Soft Button 9 Soft Button 10 Lro 1 Lro 2 Lro 3 Master Create Erase Tracks Select Record Storage EDIT Tracks Mix Tracks Mix Stop MIDI Control Locate Play Osc 1 Osc 2 Osc 3 Env 1 Dea 1 Dca 2 Dea 3 Up Arrow Advance Cursor LS Enter Flashing Underscore Mode Oo o N Enter Flashing Mode Enter Normal Mode Enter Underscore Mode DR LS Backup Cursor Clear Screen Clear Line 1 Clear Line 2 Under
27. keypad display board and from the pwoer supply Note that these connectors are keyed and have connector locks Carefully lift the wheel assembly out of the case Disconnect the cables from the disk drive paying particular attention to polarity Remove the disk drive and place it into the new assembly as described in Appendix J Reattach the disk drive cables Connect the new wire harness to the main board J4 J11 J12 to the keypad siplay board four pin and to the power supply J2 J4 paying particular attention to the alignment of pins and connectors Reconnect the wire harness to the case Reattach the wheel assembly to the case using the four screws Power up test the unit and close the control panel 30 Appendix G Replacing the Line Filter 1 Remove all cables connected to the Q80 including the power cable 2 Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts 3 Remove the three wire tabs connected to the back of the filter paying particular attention to polarity 4 Remove the two screws and nuts that secure the filter to the case Note that there are lock washers on the inside only 5 To replace the line filter first make sure that the foil shield is in place Install the new line filter from the outside of the case The foil shield should make contact with the bottom of the new line filter 6 Reconnect
28. l give aid in troubleshooting the unit To perform the following tests you will need a cassette tape deck a short MIDI cable a foot switch a control voltage CV pedal and an EEPROM storage cartridge The SQ80 should be connected in stereo to a sound system The SQ80 is heavily software dependent and certain events can cause the unit to glitch and contract a severe case of amnesia Sometimes these units merely require re initialization see page 23 step 14 Since scrambled soft ware can cause problems that at first glance appear to be hardware related the use of correlation modules particularly a known good keypad display board is strongly recommended If the keypad display board is unknown it can cause confusion in tracking down the problem If you do not have known good correlation modules and suspect a keypad display problem you should test this module first see Using self test mode page 18 1 Memory Retention Test a While holding the RECORD button press the MASTER button The sign on message should appear Create a short sequence see page 111 of the SQ80 Musician s Manual and keep it b Flip the power switch off and on 5 times allowing the sign on screen to be displayed each time c Press the INTERNAL button d Select each bank and verify that program names are not scrambled e While in each bank select any program using the soft buttons and play it to verify that the sound is not scrambled
29. nel and raise it see page 11 Important things to know about the SQ80 Lid inserts 3 Disconnect the keypad display cable J4 the power cable J11 and the pitch modulation wheel cable J12 from the main baord If a metal main board shield is present remove the six screws that fasten it to the case and keyboard frame Remove the metal shielding from the unit See page 10 Important things to know about the SQ80 Main Boards and Shields 4 Place the unit upside down on a soft surface and remove the ten screws that attach the keyboard to the case See figure I for location of screws 5 Carefully turn the unit right side up Raise the control panel and discon nect the keyboard ribbon cable J3 from the main board paying partic ular attention to its polarity 6 Remove the keyboard from the case by gently lifting up the front of it while pulling it toward the front of the unit Once the rear of the keyboard has cleared the control panel mounting tabs the keyboard can be removed from the keyboard cavity See page 7 Important things to know about the SQ80 The keyboard 7 Making note of the proper polarity remove the keyboard ribbon cable from the old keyboard and install it on the new one 8 Connect the keyboard ribbon cable to the main board Be sure that the cable lies beneath the keayboard and is not pinched under the keyboard frame If the ribbon cable is mis pinned fuses F3 and F4 will be blown 9 Insert the ne
30. oblem A con sistently dead key would indicate a keyboard problem MIDI Test a Connect Mipi in to MIDI out with a MIDI cable b Hold down a few keys d c Disconnect one end of the MIDI cable When you release the keys the notes should sustain e Play eight or more keys simultaneously to re initialize the voices Failure indicates a main board problem Re Initialization of Unit The following procedure is not a normal part of the test and should only be performed in the event that the software becomes scrambled or if indicated as part of another procedure in this manual Warning All sounds and sequences will be lost in the re initialization process Save any important data before re initializing a While holding the RECORD button press soft button 1 b c d The display will return to the sign on message All RAM is erased and all internal programs reset Display should read ERASE ALL MEMORY AND RE INITIALIZE Select YES Note When re initializing the forty factory sounds will automati calle be loaded into memory e Tune the filters see step 11 f If you are unable to re initialize the unit due to scrambled software i e the keypad not responding you can clear the RAM by following procedure i Make sure the power is off ii Short the lower lead of R1 to the bottom left pin pin 28 of U50 You should now be able to re initialize the unit as described abo
31. score at Cursor Underscore at Cursor and adv Cursor Erase Underscore at Cursor Erase Underscore at Cursor Erase Underscore at Cursor and adv Cursor Underscore 5 Characters Underscore 6 Characters Underscore 7 Characters Underscore 8 Characters Erase Underscore 5 Characters Erase Underscore 6 Characters Erase Underscore 6 Characters Erase Underscore 7 Characters Continued on next page 16 CHAPTER 2 TROUBLESHOOTING GUIDE continued from previous page Press Display reads Filter Space ENV 3 Space Env 4 Space Dea 4 Space MODES Space Split Layer Space Table 2 2 Self Test Mode 2 6 Using Self Test Mode to Diagnose Keypad Display Assembly 1 If the unit comes in with a blank display but is in self test mode i e the display prints out characters when front panel buttons are pressed in accordance with the above chart this indicates the problem is either the main board or the communication link between the main board keyboard and the keypad display board Before replacing anything check all con nections particularly the four 4 wire connector to the keypad display board Test the main board with a known good keypad display board to determine whether the main board or keypad display board is at fault If the main board is at fault try re initializing the unit as outlined in step 14 of the SQ80 test procedure page 23 also see flow ch
32. the three wires to the filter again noting the proper polarity Failure to connect the wires to their poer post can lead to a potentioal shock hazard 7 Power up test the unit and close the front panel 31 Appendix H Replacing the Operating System EPROMs The SQ80 operation system can be updated by replacing the OS EPROMs Each Q80 has two operating system EPROMs located in the center of the main board After replacing these EPROMs the SQ80 must be re initialized and the filters must be tuned The program and sequencer memory are erased during re initialization so all data must be saved before starting this procedure 1 2 Remove all cables connected to the Q80 including the power cable Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts Remove the six scres that fasten the metal main board shield if present to the case and keyboard frame See page 10 Important things to know about the SQ80 Main Board and Shields Disconnect the keypad display cable J4 the power cable J11 and the wheels cable J12 from the Main Board Remove the metal shields from the unit The two operating system EPROMs U16 OSHI and U20 OSLO are lo cated in the center ofthe main board Carefully remove the two EPROMs and insert the replacement EPROMs into their repsective sockets Be sure the notch in both EPROMs is facing towards the front
33. to use a machine screw when a brass insert is present Lid inserts Brass inserts were also added to the lid holes to prevent stripping of these holes Be sure to use machine screws in those units where brass inserts are present Do not use a self tapping screw in a brass insert as this will ruin the insert 10 CHAPTER 1 IMPORTANT THINGS TO KNOW ABOUT THE SQ80 No display All wire harness onnections OK All fuses OK Does the display self test Hard re initialize unit as described in step 14g Does the sign on essage appear All better now F3 and F4 blown Repair and retest Check keyboard cable for improper connection Display voltages OK Replace keyboard display Test power supply unloaded Power supply voltages OK from main board and see flowchart note 6 Unplug keyboard cable Replace power supply on page Does the sign on essage appear Replace keyboard Replace main board Figure 1 1 Troubleshooting an SQ80 with blank display Chapter 2 Troubleshooting Guide Flow chart note When troubleshooting an SQ80 with a blank display as outlined in the previous flow chart you may need to determine whether the main board or keyboard is at fault The following procedure can be used to determine which component is defective With the power off disconnect the 2
34. ve 22 CHAPTER 2 TROUBLESHOOTING GUIDE 2 8 Hardware Notes 1 Display Problems Units with serial numbers less than 500210 have a higher chance of having their glass fluorescent display broken during transport If the display is found to be defective be careful when removing it When changing the display on one of these units use an exacto knife to route out the lid in the area shown to ensure that the new glass fluorescent display doesn t contact the plastic control panel cut away approx 2mm here display lens goes here Ne 7 Figure 2 3 Underside of Control Panel 2 Keyboard Problems Units with serial numbers less thatn 500270 may show the following prob lems more frequently e consistently failing calibration e stuck on the Calibrating Keyboard page e not responding to button presses e individual keys not working e notes hanging These symptoms most likely indicate a keyboard failure The keyboard should be replaced 3 Double Button Presses In some units there have been problems selecting certain program posi tions This problem shows up either when holding down BANK 1 and soft button 10 or when holding down CART A and soft button 7 Swap ping the keypad display board should fix the problem If the customer doesn t want the keypad display board swapped the work around is as follows e BANK 1 and soft button 10 Press BANK 1 then hold down INTERNAL and press soft button 10 e CART A an
35. w keyboard rear first into the unit at the front of the keyboard cavity Gently slide the keyboard toward the rear of the unit lowering the front of the keyboard needed to clear the control panel mounting tabs Make sure the disk drive ribbon cable is not caught underneath the keayboard standoff 26 10 TI 12 13 27 Turn the unit upside down on a soft surface and replace the ten screws that secure the keyboard in the case Install the metal shield over the main board of present and replace the six scres that fasten it to the case and keyboard frame See page 10 Important things to know about the SQ80 Main Boards and Shields Connect the keypad display cable power cable and pitch mod wheel ca ble to the main board Power up test the unit and close the control panel Appendix D Replacing the Power Supply 1 Remove all cables connected to the Q80 including the power cable 2 Remove the four screws that fasten the control panel and raise it see page 11 Important things to know about the SQ80 Lid inserts 3 Disconnect pin connectors J1 J2 J3 and J4 from the power supply board Note that these connectors are keyed 4 Remove the two scres and nuts that secure the power supply to the case Note that there are lock washers on each screw and a ground wire leading from the line filter to the center screw remove this wire from the line filter end 5 Remove the power supply board by pulling the
36. was attached to the metal main board shield This wire ensured a good ground in the event that the main board ground screw hole was stripped If a ground wire is present you must feed the spade lug end of the ground wire through the opening in the mteal main board shield and install it onto the screw directly across from the opening in the shield 1 5 Plastic Case Avoid stripping screws Because the structural components base control panel wheel cover and keyboard support rails are made of plastic great 1 5 PLASTIC CASE 9 care should be exercised when assembling or disassembling any part of the SQ80 Avoid over tightening screws in the plastic case when executing any repair procedure When replacing any of the self tapping screws it is possible to over tighten the screws and strip a hole in the case making it necessary to replace the case or control panel To keep this from happening follow these procedures 1 Before replacing the screw s put a drop or two of Locktite Super Glue Gel or RTV into the hole 2 Install the screw tightening only until the sub assembly being attached is snug against the case Do not tighten the screws any further When the glue sets the screws will hold the sub assembly tightly in place Ground insert Initially all screw holes in the case used self tapping screws Later a brass insert was added to the main board ground boss and the ground wire from the main board was eliminated Be sure
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