eps·16 plus keyboard only section
Contents
1. DE Keyboard and Rack PIN 9312 001301 A ensonia THE TECHNOLOGY THAT PERFORMS ENSONIO Customer Service Hours Parts ordering in U S and Canada Monday through Friday 1 800 441 1003 9 30 AM to 6 30 PM Eastern Time Closed for lunch 12 15 PM to 1 15PM NOTES EPS 16 PLUS Service Manual Table of Contents TABLE OF CONTENTS Page Important Things to Know About the EPS 16 PLUS 1 Getting Around the EPS 16PLUS 2 4 2 1 2 Keyboard and Rack Similarities 2 2 22 2 2242 1 3 The EPS 16 PLUS Keyboard Assembly and the Rack KPC Simulator 1 4 IMSS DIS Dive de amp a a 44 0 ss amp e ee Ee amp oS ose 2 5 Operating System O S 2 2 2 2 2 2 2 2 4 Sos 3 6 Plastic Case EPS 16 PLUS Keyboard only TES 7 EPS 16 PLUS Rack Screws sous ee da a 4 4 8 High Retention Force Connectors 4 Figure l SDE n ame yy ee IAEA 4 Communications Path 5 Figure 2 Communications Path 4 2 2 2 2 224 2 5 Power Supply Checking the Power Supply SA RIA 7 Figure 3 AC Line Voltage Check Points 2 2 2 2 4 7 AC Line Voltage Measurements o e o 7 Power Supply Measurements e 8 Figure4 Power Supply Voltage Check Points 2 2 ae 8 Transformer and Power Supply Voltage Check Points 2 2 8 Testing the Power Supply Unloade2. EPS 16 PLUS Keyboard and Rack 23 Figure 10 Trace cut for Rev A B or C Main Boards se 323 KeyDoard ODIY y e se A e e ar e a ee a SS 23 RAR ODY gon od 2 a amp tn e tea oe E A ee 8 24 Figure 11 Hardware Notes for the Rack 24 Error Messages 4 ah he eee A A A 2 e V 25 Software Notes Checking the Software Version 0 a 25 Bootup ROM Changes 0 0 0 25 O S Disk Version 1 10 Changes A 0 26 EPS 16 PLUS Keyboard Only Section e a e 16 3 27 Figure 12 EPS 16 PLUS Keyboard Exploded View 28 Section ReplacingtheEPS 16PLUSMainBoard sa 29 Section B Replacing the EPS 16 PLUS Keypad Display Board 29 Figure 13 EPS 16 PLUS Button Colors 2 2 2 2 30 Section C Replacing the EPS 16 PLUS Keyboard 30 Figure 14 Bottom of Case 0 31 Section D Replacing the EPS 16 PLUS Power Supply Board 31 Section E Replacing the EPS 16 PLUS Transformer na DZ Section F Replacing the EPS 16 PLUS Pitch Mod Wheel Assembly 32 Section G Replacing the EPS 16 PLUS Line Filter 2 oo Section H Replacing the EPS 16 PLUS Disk Drive a 39 EPS 16 PLUS Rack Only Section 2 02 22 2 yo 35 Figure 16 EPS 16 PLUS Rack Exploded View 2 2 36 Secti
3. Be sure that the cable lies flat beneath the Keyboard and is not pinched under the Keyboard frame Installing IMPORTANT Tf the ribbon cable is mispinned fuses F3 and F4 on the power supply will blow 8 Insert the new 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 as needed to clear the control panel mounting tabs IMPORTANT Make sure the Disk Drive ribbon cable is not ue under the Keyboard standoffs 9 Turn the unit upside down on a soft surface and replace the ten 10 screws that secure the Keyboard to the case 10 Power up test the unit and close the control panel page 30 EPS 16 PLUS Service Manual Replacing EPS 16 PLUS Modules KEYBOARD ONLY Front of Case Keyboard Side Keyboard Screws Figure 14 Bottom of Case Replacing the Power Supply Board Removing 1 Remove all cables connected to the EPS 16 PLUS including the Power cord 2 Remove the four 4 screws that fasten the control panel with a 2 5mm hex wrench NOTE These are machine screws 3 Disconnect the 9 pin connectors J1 J4 the 6 pin connector 33 and the 4 pin connector J2 from the Power Supply Board Note that these connectors are keyed 7 o IMPORTANT The connector on the 9 pin cable from the transformer has a high retention force Please use a scribe screwdriver or similar tool to remove it see p 4 D
4. Turn the unit OFF Attach the communications test board Turn the unit ON and boot it up normally The display will show KBD FAILED TRY AGAIN Press Cancel No If your communications test board has an edge connector 4090013601 this message will not appear Load in and then select PLANO 241 Set both footswitch to act as Patch Select Buttons see above i Replace the Main Board ly N Is it working properly o see Section A YES Figure 6 Footswitch Problem Replace Keyboard KPC Simulator Board see Section C page 12 EPS 16 PLUS Service Manual Troubleshooting Guide TROUBLESHOOTING AN EPS 16 PLUS WITH NO LEDS LIT No LEDs lit Are ail wire harness connections making good contact YES Check Keyboard KPC 20 pin ribbon cable for improper connnection Any power supply fuses blown Are fuses F3 and F4 blown NO Are the display voltages correct J3 on power supply p 8 Replace the Keypad Display Board Section B NO Figure 7 No LEDs Lit f Test the power supply unloaded Go to Incorrect Power Supply Voltages flow chart p 9 EPS I6 PLUS Service Manual page 13 Troubleshooting Guide TROUBLESHOOTING AN EPS 16 PLUS WITH SOME LEDS LIT SOME LEDS LIT Test the power supply unloaded Go to Incorrect Power Supply Voltages flow chart on p 9 Are the p
5. an EPS 16 PLUS that has a problem communicating with its Keypad Display Board you may want to verify continuity between the connectors on the Main Board Turn off the power and unplug the 20 pin ribbon cable from the EPS 16 PLUS Main Board at J12 and the EPS 16 PLUS 7 pin Display cable from the Main Board at J15 Using an Ohmmeter verify continuity between the following points on the Main Board 20 pin Keyboard Connector 7 pin Display Connector Pin 1 to Pin 1 Pin 3 to Pin 2 Pin 5 to Pin 3 page 6 EPS 16 PLUS Service Manual EPS 16 PLUS Power Circuitry CHECKING THE POWER SUPPLY Many EPS 16 PLUS problems may be related to a faulty Power Supply Transformer or Line Filter You should check these before troubleshooting the rest of the unit Check to make sure that all the cable connections are secure and correct Plug the EPS 16 PLUS in and turn it on After the EPS 16 PLUS has warmed up for five minutes begin to test the voltages at the points shown in Figures 3 and 4 If the voltages vary outside the allowable limits follow the procedure described under TESTING THE POWER SUPPLY UNLOADED before replacing it Line Fuse Botto Top eee i Lug Holder Ly Lug WARNING There are dangerous JUL CA D Voltages present in _ this area To Power Supply NOTE All wires come from the bottom of the transformer Figure 3 AC Line Voltage Check Points AC LINE VOLTAGE MEASUREMENTS see Figure 3
6. gt 9 LAYER Home Cursor RECORD O O TRACK STOP CONTINUE 5 Up Arrow 3 PLAY 6 page 10 EPS 16 PLUS Service Manual Troubleshooting Guide TROUBLESHOOTING GUIDE Often the faulty module in an EPS 16 PLUS can be determined through normal use Sometimes it is difficult to isolate the problem The following flowcharts can help you diagnose units that appear dead no display When troubleshooting an EPS 16 PLUS always disconnect any expansion devices that may be present such as the memory expander SCSI Interface or OEX 6 Output Expander This will prevent a faulty expander from complicating your troubleshooting The procedures for testing the Memory Expander and the SCSI Interface are included with the corresponding expander The procedure for testing the OEX 6 can be found on p 19 The following pages include troubleshooting flow charts Page Problem 9 Incorrect Power Supply Voltages 12 Footswitch problems 13 EPS 16 PLUS with No LEDs Lit 14 EPS 16 PLUS with Some LEDs Lit 15 EPS 16 PLUS with All LEDs Lit No Display Troubleshooting an EPS 16 PLUS with a Footswitch Problem see Figure 6 If one or both of the footswitches do not operate properly make sure that the footswitches are set to the proper mode on the Edit System MIDI page See Section 2 of the EPS 16 PLUS Musician s Manual for more information The SUSTAIN FT SWITCH parameter corresponds to the right pedal of SW 5 or single pedal SW 1 The AUX FT SWITCH
7. insert the jacks into the holes in the rear panel Press the board down and into place 8 Replace the Main Board screws and secure the jacks with the nuts 9 Reconnect the cables Reinstall the Keyboard see Section C 10 Power up test the unit and close the control panel Replacing the Keypad Display Board Removing 1 Remove all cables connected to the EPS 16 PLUS including the Power cord 2 Remove the Volume and the Data Entry knobs Remove the four 4 screws that fasten the control panel with a 2 5mm hex wrench and raise the panel NOTE These are machine screws 3 Remove the six wire cable from the left side and seven wire cable from the right side of the Keypad Display board Note that these cables are keyed IMPORTANT The individual colored buttons are held in place only by the Keypad Display board underlay Make sure the control panel is open all the way to prevent the buttons from falling out when the board is removed If they do fall out see Figure 13 for button color placement 4 Remove the fourteen 14 screws that hold the Keypad Display i in place and carefully remove the Keypad Display Remove the cardboard insulator that covers the bottom of the Keypad Display board Installing 5 Toreassemble first make sure that the underlay and all the buttons are in place and that the lens is clean and in its proper position 6 Install the new Keypad Display board with the cardboard insulator using the fourteen 14 sc
8. keypad display board two wires to the power switch and unplug the headphones cable from the main board Carefully tip the unit onto its rear panel Remove the four 4 self tappin g screws and one star washer from the bottom of the unit closest to the control panel Remove the one 1 machine screw from the bottom of the unit located about 1 back from the control panel this screw goes through the disk drive mounting bracket inside the unit Carefully remove the Control Panel from the unit just enough to unplug the 20 pin ribbon cable from the KPC simulator board Place the Control Panel face down on a soft surface Remove the eleven 11 screws that attach the Keypad Display Board to the control panel See Hardware Notes p 24 Install the new Keypad Display board onto the new control panel using the eleven screws Reconnect the 20 pin ribbon cable to the KPC simulator board before sliding the new assembly into place make sure the striped side of the ribbon cable is on pin 1 Reconnect the 20 pin ribbon cable to the KPC simulator board before sliding the new assembly into place Be sure to install all screws into the Control Panel with a hand screwdriver to avoid stripping the holes see p 4 10 Install the four 4 self tapping screws one with a star washer on the bottom of the unit closest to the control panel 11 Install the one 1 machine screw from the bottom of the unit located Aba 1
9. to trace does not need to be cut this feedthru is cut 50 81 on Rev D or higher boards 51 80 CUT HERE Main Board Edge Figure 10 Trace cut for Rev A B or C Main Boards For best results be sure that the EPROMS are version 1 00F or higher For more information see Keyboard and Rack Similarities on p 1 EPS 16 PLUS KEYBOARD ONLY 1 OEX 6 CAUTION IMPORTANT The 8 pin mini DIN connector on the rear panel of the EPS 16 PLUS should only be used to connect the OEX 6 Output Expander to the unit This connector does not simply supply audio outputs and signal ground and therefore cannot be used to generate separate outputs without the OEX 6 The EPS 16 PLUS generates digital signals which must be converted externally The signals present on this connector include digital control signals and 15VDC Improper connections to these signals could easily damage the EPS 16 PLUS or any external device connected The OEX 6 should never be plugged in or unplugged with the EPS 16 PLUS power on as this could damage the EPS 16 PLUS Keyboards that think that they are a Rack The O S disk and EPROMs are the same for both the EPS 16 PLUS keyboard and dh With O S disk Version 1 00 the software determined whether the unit was a keyboard or a rack by the value position of the pitchwheel If the pitchwheel was off center the unit would not go through the keyboard calibration routine and would act just like a rack To fix this upda
10. will display the number of times the test has been performed and the number of times the test has failed The format is shown below Test Iterations Test Failures XXXXX XXXXX xxxxx 5 digit count value Failed Test Problem in order of likelihood DYNAMIC RAM Main Board DISK WRITE Test Disk Disk Drive cable Disk Drive Main Board DISK READ Test Disk Disk Drive cable Disk Drive Main Board MIDI IN OUT Check cable continuity and cable insertion Main Board KEYBOARD Keyboard cable Keyboard SUSTAIN FOOTSWITCH Check cable continuity and cable insertion Main Board Keyboard AUX FOOTSWITCH Check cable continuity and cable insertion Main Board Keyboard INDEX PULSE Disk Drive Disk Drive cable Disk Drive Main Board ESP RAM Main Board ESP GPR REGISTERS Main Board ESP INSTR REGISTERS Main Board page 22 EPS 16 PLUS Service Munual Hardware Notes HARDWARE NOTES EPS 16 PLUS KEYBOARD AND RACK FLASHBANK Format Errors On Rev C and lower Main boards ONLY 4001013501 with Rev letter is located next to the MIDI Thru jack a trace cut must be made in order for the unit to work properly with a FLASHBANK option see Figure 10 If this trace is not cut all the way through you may get a FLASH FORMAT ERROR message when formatting a FLASHBANK DO NOT CUT THIS TRACE ON REV D or higher BOARDS Im P On 40010013501 board of _ 31 100 Rev A B or C make sure Pin 38 gt lt that this trace is cut This make sure the trace
11. 3 J4 13 00 to 18 70 VACrms Analog Supply 4 6 J4 22 00 to 28 60 VACmns Display Filament 7 9 J4 470 to 6 05 VACrms VA 10 11 J1 20 00 to 28 00 VDC VA 12 11 J1 20 00 to 28 00 VDC 5 Analog 14 13 J1 4 75 to 5 25 VDC V Digital 15 13 J1 7 20 to 12 10 VDC 5 Memory 16 13 J1 4 75 to 5 25 VDC 5 Digital 18 17 J1 4 75 to 5 25 VDC 5X 24 23 J3 4 75 to 5 25 VDC 35 25 23 J3 29 00 to 37 20 VDC Filament 27 28 J3 470 to 6 05 VACrms Display Offset 27 26 J3 22 70 to 31 50 VDC 5X 19 20 J2 4 75 to 5 25 VDC page 8 EPS 16 PLUS Service Manual EPS 16 PLUS Power Circuitry TESTING THE POWER SUPPLY UNLOADED If the Power Supply readings exceed the indicated tolerance particularly the 5 Digital line between terminals 18 and 17 or 5 Memory line between terminals 16 and 13 itis possible that a defective component on the Main Board is drawing the Power Supply down In this case you should test the Power Supply unloaded before proceeding Incorrect power supply voltages Turn the unit OFF Check the fuses Verify the the proper Line Voltage is present Turn the unit ON Still wrong voltages YES Turn the unit OFF Disconnect the Keyboard cable from the main board Turn the unit ON Still wrong voltages YES Turn the unit OFF Disconnect the cable between the power supply and the Keypad Display Board Turn the unit ON Still wrong voltages YES Tum the unit OFF Disconnect the cable between th
12. A EPS 16 PLUS Service Manual page 41 Replacing EPS 16 PLUS Modules RACK ONLY Installing page 42 SECTION NO OO N ON Un Replacing the Rack Memory Expander Board Remove all cables connected to the EPS 16 PLUS Rack including the power cord Remove the lid see Section A Remove the control panel see Section B With the front panel close to you the memory expander board is located in the left corner of the unit Remove the screws that attach the memory expander to the base If the memory expander board is a REV A there should only be two screws holding it in If the memory expander is a REV B or higher there should be four screws holding it in place See Rack Hardware Notes item 4 on p 24 Wiggle the memory expander board side to side and up a bit to remove it Before installing the replacement board make sure that the connector fingers are clean If needed clean them using a pencil eraser Insert the board fingers into the main board connector Attach the board to the chassis using the correct number and placement of screws See Rack Hardware Notes item 4 on p 24 Power up test the unit and reattach the lid see Section A EPS 16 PLUS Service Manual
13. Assembly 32 G LineFilter 5 as OS H DiskDrive o ID EPS 16 PLUS Service Manual puge 27 gt A Slider Knobs a 4 see oo Y Q E f a 2 f han NYS LL la Jack N T S Power Suppl By sae T Board tar Figure 12 Line Filter EPS 16 PLUS Keyboard Exploded View page 28 EPS 16 PLUS Service Manual Replacing EPS 16 PLUS Modules KEYBOARD ONLY Replacing the Main Board 1 Remove all cables connected to the EPS 16 PLUS including the Power cord 2 Remove the four 4 screws that fasten the control panel with a 2 5mm hex wrench and raise the control panel NOTE These are machine screws 3 Remove the Keyboard see Section C Note that you should remove the 20 pin 4 Removing ribbon cable from the Main Board at J12 instead of from the Keyboard Disconnect all cables from the Main Board a Push on ground wire located between the MIDI Thru and MIDI Out jacks b J4 DISK 34 pin ribbon cable _ c J11 POWER 9 wire cable d J13 WHEELS e J15 DISPLAY f J2 NON VOLATILE MEMORY and or J3 AUX EXPANSION if present 5 Remove the six 6 15mm nuts from the rear panel jacks marked Ft Sw Pedal CV Left Mono Right Mono Audio In and Phones 6 Remove the eight 8 self tapping screws and one ground machine screw with star washer that attach the Main Board to the case and remove the board Installing 7 With the board tilted on a slight angle
14. Check a Select PRESSURE InstrumenteTrack2 Save PRESSURE back to the disk Press Command and double click on the Instrument button The display shows SAVE IN STRUMENT press Enter Y es The display will show NAME PRESSURE Press down arrow to change the name to ORESSURE Press Enter Yes The display will say DELETE OLD VERSION except the first time you save this sound Press EntereYes to save ORESSURE DISK COMMAND COMPLETE will appear briefly when finished Eject oe test disk and then press Load Verify that the display shows DISK DRIVE NOT EPS 16 PLUS Service Manual page 17 EPS 16 PLUS Test Procedure KOA Reinsert the test disk and then press Load Verify that the display shows FILE 1 IN OUT BURN Eject the test disk and then reinsert the test disk and press Load A file name should appear in the display If the message DISK DRIVE NOT READY appears then FAIL the unit REPEAT step f 5 times If there is a failure check the components in the following in order 1 disk 2 disk drive cables 3 Disk Drive and 4 Main Board 5 Sound Check a b C Select PIANO 241 InstrumenteTrack1 Play a bit to check sound quality Play up the keyboard to verify that PIANO 241 pans from left to right j Select 20 VOX TEST Instrument Track4 Press and hold down the three lowest white keys Twenty notes will play in succession with the last note dropping an octave Verify that there are no missing notes distor
15. D OS DISK HIT ENTER Eject the test disk and insert the O S disk and then press EnterYes The display shows PICK SAMPLE INST Press InstrumentsTrack5 then EnterYes for the VU meter Scroll right to INPUT LEVEL and set it to MIC then scroll back to the VU meter Press EntereYes and sample by speaking into the microphone You should hear what you are sampling at the Audio Output Press Cancel No to stop sampling Play the sample and listen critically Press the Up Arrow button once and play the sample in BACKWARD NO LOOP mode Unplug the microphone from the Audio In jack Failure indicates a Main Board problem For more information on Sampling see Section 5 of the EPS 16 PLUS Musician s Manual 11 OEX 6 When troubleshooting an EPS 16 PLUS with an OEX 6 that is not operating properly you will need to determine whether the EPS 16 PLUS or the OEX 6 is at fault If possible try the OEX 6 with another EPS 16 PLUS or try the problem EPS 16 PLUS with a different OEX 6 The operation of the OEX 6 can be tested using the following procedure a Load and select the sound called 6 OUT TEST b While playing the same note on the keyboard listen to each OEX 6 output individually You should hear a single square wave tone in each output and the tone in each successive output should be a semitone higher in pitch than the previous output mh 0 ao Tp po Note that the OEX 6 outputs are not designed to drive headphones di
16. SH TEST b Select each instrument one at a time and play it Listen for ESP effects problems sound clarity noise etc Also watch for ESP download errors as an instrument is selected Download errors will show up as either a SYSTEM ERROR or as the outputs playing dry instead of with effects Failure indicates a Main Board problem page 20 EPS 16 PLUS Service Manual EPS 16 PLUS Burn in Test Program BURN IN TEST PROGRAM To run the Burn in Test Program you must have the following items e One EPS 16 PLUS Burn in Test Disk One MIDI Cable One 1 4 Mono to 1 4 Mono cable One 1 4 Stereo to 1 4 Stereo cable The Burn in Test Program is used at ENSONIQ to exercise the system hardware of a complete unit There are two test operations that the program can perform 1 A continuous burn in test of all components and 2 a keypad integrity test The continuous operations test the Dynamic RAM Disk Drive Read and Write MIDI In Out Keyboard Sustain Footswitch Aux Footswitch Disk Drive Index Pulse ESP RAM ESP GPR Registers and ESP Instruction Registers The Disk Drive Read and Write tests are run approximately every ten minutes and take about five minutes to run Failures of components can be automatically detected in all operations BURN IN TEST 1 Plug MIDI Loop Cable into MIDI In and MIDI Out jacks Plug the Mono to Mono cable into the Audio Out Left and Pedal CV jacks Plug the Stereo to Stereo cable into the Headphone
17. With the power switch OFF With the power switch ON the proper AC Line Voltage the proper AC Line Voltage should read from should read from 2B 1A 2B 1B 2B 3B 2B 3A 2B 1A 2B 2A 2B 3B There should be no voltage across the power switch EPS 16 PLUS Service Manual page 7 EPS 16 PLUS Power Circuitry POWER SUPPLY MEASUREMENTS The voltage and part number of the Transformer is denoted by the label on the top of the Transformer The Power Supply part number is silk screened on the left side of the Power Supply PC board POWER SUPPLY BOARD D D 12 o 14 D QO S He C 15 T 3 Je 9 6 Power amp lt 2 E ZO E F 8 A 7 Figure 4 Power Supply Voltage Check Points The Transformer part numbers for the EPS 16 PLUS are 100V 1450000622 230V 1450000252 120V 1450000242 240V 1450000832 TRANSFORMER AND POWER SUPPLY VOLTAGE CHECK POINTS The proper AC Line Voltage for each EPS 16 PLUS should be printed on the top of the Transformer Figure 3 shows the check points for reading the AC Line Voltage Figure 4 shows the connector terminal numbers for the Power Supply and Transformer It is normal for Line Voltage to vary 10 _ The following chart lists the voltage ranges for proper operation of each supply fully loaded and the appropriate terminals to read across with the volt meter refer to Figure 4 for terminal locations Designation Terminals Connector ll l Units Digital Supply 1
18. al 5 Edit as you wish Question Why do some other manufacturer s instruments crash when played from an EPS 16 PLUS keyboard CSR These instruments cannot handle the vast amount of MIDI data that Poly Key generates Turn the key pressure settings to CHAN or OFF on MIDI and each INSTRUMENT as follows 1 Press Edit then System MIDI see Section 2 of the Musician s Manual 2 Scroll to BASECHANNEL PRESSURE KEY 3 Change it to CHANNEL or OFF 4 Press Edit then Instrument see Section 3 of the Musician s Manual 3 Scroll to PRESSURE MODE KEY 6 Change it to CHANNEL or OFF page 16 EPS 16 PLUS Service Manual EPS 16 PLUS Test Procedure EPS 16 PLUS TEST PROCEDURE The following procedure will ensure the thorough testing of the EPS 16 PLUS and also will aid in troubleshooting the unit To do the following tests you will need a MIDI cable a Dual Footswitch model SW 5 and a Control Voltage Pedal model CVP 1 The EPS 16 PLUS should be connected to a sound system in stereo If it is not known whether the Keypad Display board is good 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 Self test Mode p 10 1 Power Up see Section 1 of the EPS 16 PLUS Musician s Manual for more information a b Turn unit on All the LEDs above the Instrument Track buttons should light and the display sh
19. al Replacing EPS 16 PLUS Modules RACK ONLY Replacing the Rack Main Board Removing 1 Remove all cables connected to the EPS 16 PLUS Rack including the power cord 2 Remove the lid see below Remove the OEX 6 board see Section F steps 3 6 3 Remove the five 5 15mm nuts from the rear panel jacks marked Audio In Right Mono Left Mono Pedal CV and Ft Sw 4 Disconnect all cables from the Main Board 5 Remove the ten 10 machine screws and one star washer from the ground pad from the Main Board one screw is located in the middle of the board between VR6 and C68 See Rack Hardware Notes items 3 and 4 on p 24 Installing 6 Before installing the new circuit board make sure the mylar 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 and into place 8 Replace the Main Board screws and secure the jacks with the nuts Reconnect the cables 9 Reinstall the OEX 6 board see Section F and secure the jacks with the nuts 10 Power up test the unit and reattach the lid see below REMOVING THE LID Removing Remove the twenty two 22 screws that fasten the cover 1 Remove the one 1 6 32 machine screw from above the disk drive about an inch back from the front panel that attaches the cover to the disk drive bracket Remove the four 4 8 32 machine screws and star washers from each side panels of the unit the ones that could atta
20. ard Memory E into a Rack be sure that the REV A Expander a Z mark in this corner is disconnected Board from the trace next to it 4 Leave these two mounting screws out when eitis a REV A Memory Figure 11 Expander board and Hardware Notes no SCSI board is installed o for the Rack only 3 If this Main Board hole doesn t line up with its mounting PEM leave the screw out 4 ME 16 PLUS Memory Expander Board On some REV A boards one of the mounting screws could connect a 5V trace to the grounded chassis see Figure 11 On power up the unit would show LOADING SYSTEM but get no further Leave these two screws out when a REV A memory expander board is used and when no SCSI board is installed no screw head will touch the trace when a SCSI board is installed 5 SCSI Board On some REV A SCSI boards a mounting screw could connect a 5V trace to the grounded chassis see Figure 11 Use a razor knife to disconnect the bottom left corner of the R in REV A from the trace next to it page 24 EPS 16 PLUS Service Manual Software Notes Error Messages Occasional error messages are not unusual and unless they become chronic they are not a cause for concern It is important to realize that these messages are diagnostics and do not necessarily indicate a problem These messages were designed to help our software engineers in the development of the software not as hardware diagnostics The following error messages
21. as no visual feedback during this time causing users to wonder what was going on When the sequencer is synced to MIDI CLOCK SOURCE MIDI on the EDIT SeqeSong page and you press record the display shows MATING to indicate that the unit is waiting for a MIDI Start and clocks before going into Record If the sequencer is synced to MIDI and it needs to shuffle memory before going into record it will show SHUFFLING DATA for as long as necessary then go to WAITING Always wait until the display shows waiting before starting the sending device The following is a summary of changes which were included in version 1 10 HANGING NOTES It was possible to make notes hang while playing DIST GUITAR sound related to layer delay PITCH WHEEL Pitch wheel reading drifted as the unit warmed up MIDI e If TRANSMIT ON INST CHAN it didn t send proper values for key pressure out MIDI e Sustain pedals from MIDI were not recorded properly by the sequencer gt LOADING AND SAVING When you q an Instrument into a Copy of an already loaded i instrument it sometimes crashed displaying ERROR 1 The EPS 16 PLUS did not handle errors properly when saving multi disk files particularly when resaving an existing one Sometimes it created two Disk 1 s and a Disk 2 for a 3 disk sound e When a bank should have been loading sounds from hard disk the unit seemed to ask for a floppy then displayed WRONG DISK INSERTED when you inserted the floppy because it
22. ase 248 31 Figure 16 EPS 16 PLUS Rack Exploded View 2 36 Table of Contents 2 EPS 16 PLUS Service Manual Important IMPORTANT THINGS TO KNOW ABOUT THE EPS 16 PLUS IF YOU DON T READ ANY OTHER PART OF THIS MANUAL READ THIS SECTION As with every ENSONIQ product all EPS 16 PLUS service will be handled through the ENSONIQ Module Exchange Program Rather than diagnose and exchange individual components you will replace complete modules We feel that this is the most time and cost effective method of repair both for you and your customers The instructions in this manual are for both the EPS 16 PLUS Keyboard and Rack unless otherwise noted Where the instructions say to check the keyboard of the EPS 16 PLUS substitute a check of the KPC simulator board on the EPS 16 PLUS Rack When troubleshooting an EPS 16 PLUS remove any optional modules that might be present This will prevent a faulty option from complicating your troubleshooting 1 GETTING AROUND THE EPS 16 PLUS You will need EPS 16 PLUS Operating System O S Disk EPS 16 PLUS Test Disk including test sounds Communications Test Board EPS 16 PLUS Musician s Manual 2 KEYBOARD AND RACK SIMILARITIES The Main Board and Power Supply board are the same for both the EPS 16 PLUS Keyboard and Rack However there are physical differences that will require you to specify which unit you are 1o parts for The disk drive is the same for
23. asses it on to the Display Whenever a button is pressed on the control panel the Keypad Display Board sends the message to the Keyboard assembly which in turn passes it on to the Main Board The communications path is shown in Figure 2 The Main Board communicates with the Keyboard assembly over a two line asynchronous interface carried by the 20 pin Keyboard assembly ribbon cable The Keyboard assembly communicates with the Keypad Display Board over a three line synchronous interface which is carried over to the Main Board via the 20 pin ribbon cable then up to the Keypad Display Board via the 7 pin Display cable on the EPS 16 PLUS and the 10 pin Display cable on the EPS 16 PLUS Rack Due to the complexity of the modules involved it is often difficult to determine which module is at fault when a communications problem occurs To facilitate troubleshooting a Communication Test Board Test Disk and Burn in Test Disk are available KEYPAD DISPLAY BOARD oe 7 PIN DISPLAY CABLE MAIN BOARD Bach DATA 9 17 1 N oar Py 9 20 PIN RIBBON CABLE JKEYBOARD DATA DATA DATA DATA CLOCK KPC SIMULATOR or N jor N N ASYNCHRONOUS SYNCHRONOUS PORT PORT Figure 2 Communications Path If a communication problem occurs i e no display or no response to button presses or keys it could be something as simple as a bad ribbon cable or Display cable or it could be a problem in one of the modules To help you identify a faulty module a spe
24. back from the control panel this screw goes through the disk drive mounting bracket inside the unit 12 Connect the two cables to the disk drive three cables to the keypad display two wires to the power switch see Figure 2 and plug the headphones cable into the main board paying particular attention to polarity 13 Power up test the unit and reattach the lid see Section A page 38 EPS 16 PLUS Service Manual Replacing EPS 16 PLUS Modules RACK ONLY Replacing the Rack KPC Simulator Board Removing 1 Remove all cables connected to the EPS 16 PLUS Rack including the power cord Remove the lid see Section A Remove the control panel see Section B OR remove the transformer see Section E Disconnect the 20 pin ribbon cable from the KPC simulator board Pop the KPC simulator board from the four white standoffs by squeezing the standoffs Install the new KPC simulator board onto the standoffs making sure the side of the board with the 20 pin connector is closest to the base of the unit Connect the 20 pin ribbon cable making sure that the striped side is on pin 1 Reinstall the control panel see Section B OR the transformer see Section E Power up test the unit and reattach the lid see Section A Installing O 00 J MN QU f UI N SECTION Replacing the Rack Power Supply Board Removing 1 Remove all cables connected to the EPS 16 PLUS Rack including the power c
25. base using the screws star washers and nuts 6 Reconnect the three wires to the Filter again noting the proper polarity Installing IMPORTANT Failure to connect the wires to their proper posts can lead to a potential shock hazard see Figure 3 7 Power up test the unit and reattach the lid see Section A SECTION Replacing the Rack Disk Drive Remove all cables connected to the EPS 16 PLUS Rack including the power cord Remove the lid see Section A Remove the control panel see Section B Disconnect the two cables from the Disk Drive paying particular attention to the polarity see p 2 the Disk Drive Remove the four 4 screws that attach the Disk Drive mounting brackets to the control panel Remove the four 4 screws that attach the mounting brackets to the Disk Drive Immediately place the defective drive into the anti static bag that the new drive came in Installing 7 Attach the mounting brackets to the new Disk Drive using the four screws Removing IMPORTANT Be sure to install all screws into the Control Panel with a hand screw driver to avoid stripping the holes see p 4 8 Attach the mounting brackets to the control panel trying to use the same holes 9 Attach the control panel to the base see Section B 10 Connect the two cables paying particular attention to the alignment of pins and connectors 11 Power up test the unit and reattach the lid see Section
26. both units The Keypad Display boards are ifferent Instead of a Poly Key Keyboard assembly with KPC board the Rack has a KPC simulator board The KPC simulator board passes information between the Keypad Display board and the Main Board like the KPC board does for the Keyboard unit In the rest of this manual whenever you see Keyboard assembly substitute KPC simulator for the Rack except where otherwise noted The operating system is only on the EPS 16 PLUS O S disk This disk is the same for both the EPS 16 PLUS Keyboard and Rack The EPS 16 PLUS Rack has the OEX 6 Output Expander and ME 16 PLUS memory expander built in These two expanders are options for the Keyboard unit FLASHBANK FB 1 and FB 2 Kits and SCSI SP 2 Kit are options for both 3 THE EPS 16 PLUS KEYBOARD ASSEMBLY and the KPC SIMULATOR BOARD The Poly Key Pressure Keyboard assembly on the EPS 16 PLUS and the KPC simulator board on the Rack is a complex module that contains its own computer and software So when necessary you will be swapping it out as a whole unit Display information sent to and from the Main Board is processed through the Keyboard assembly KPC simulator What might appear to be a frozen display therefore could be a bad Keyboard assembly KPC simulator For more troubleshooting hints see Communications Path on pp 5 6 and flow charts on pp 9 and 12 15 EPS 16 PLUS Service Manual page 1 Important IMP RTA NT Keyb
27. ch the mounting ears Remove the four 4 6 x 1 4 self tapping screws that attach the lid to the front panel Remove the nine 9 5 x 1 4 self tapping screws that attach the lid to the base a remove two 2 screws from each side of the unit and b remove five 5 from the back of the unit Note that the center screw has a star washer 5 Carefully remove the lid from the unit REATTACHING THE LID IMPORTANT Be sure to install all screws into the Control Panel with a hand screw driver to avoid stripping the holes see p 4 Installing 1 Install the five 5 self tapping screws on the back of the unit Make sure that there is a star washer on the center screw Install the two 2 self tapping screws on either side of the unit Install the one 1 machine screw on the top of the unit located about 1 back from the control panel the four 4 self tapping screws on the top of the unit closest to the control panel Install the four 4 machine screws and star washers into each side of the unit the ones that could attach the mounting ears EPS 16 PLUS Service Manual page 37 Replacing EPS 16 PLUS Modules RACK ONLY SECTION Removing 1 Nn Installing IMPORTANT OD 0 N DN Replacing the Rack Keypad Display Board Remove all cables connected to the EPS 16 PLUS Rack including the power cord Remove the lid see Section A Remove the two cables from the disk drive three cables from the
28. cial Communication Test Board is included available from ENSONIQ Customer Service The Communication Test Board simulates the operation of the Keyboard assembly and can be used as a known good module in place of the Keyboard assembly for troubleshooting EPS 16 PLUS Service Manual page 5 Communications Path IMPORTANT When using the Communication Test Board keep in mind that it is sensitive to static discharge Handle the board by the edges and store it in the anti static shipping bag when not in use Do not let the board short out when testing place an insulator cardboard paper etc underneath it Attaching the Communications Test Board If an EPS 16 PLUS has a communications problem turn the unit off and unplug the 20 pin Keyboard assembly ribbon cable from the Main Board at connector J12 Plug the 20 pin ribbon cable from the Communication Test Board into J12 This will eliminate the Keyboard assembly as a variable Turn the system on If the communications problem persists you know the Keyboard assembly is not at fault If communication is restarted however the Keyboard assembly is at fault See the How charts on pp 12 15 for troubleshooting procedures _ There is one further complication Since the communications path between the Keyboard ay and Keypad Display Board is routed through the Main Board there is a remote possibility that the printed circuit connections between the two connectors are defective If you have
29. could be caused by software ID Description ID Description 16 poly or mono pressure events sent to VC 133 trapv instruction overflow error 20 unknown button event 134 privilege violation 48 parameter error 135 trace 49 layer error 137 line 1111 emulator 80 bad buffer to MIDI 138 spurious interrupt lt 128 bus error 139 unused vector 129 odd address error 192 load all data error from MIDI or card 130 divide by zero 193 keyup playback error 131 illegal instruction 194 out of SDBs error 132 chk instruction register out of bounds Main Board Problems The following unexpected event ESSE could be caused by a problem on the Main Board 32 bad download 40 bad ESP error 33 bad ESP chip 138 spurious interrupt 34 bad ESP RAM 145 unknown DUART interrupt error MIDI or Main Board Problems The following unexpected event message is usually caused by too much i incomin g MIDI data It also could be caused by a problem with the keyboard 144 out of buffers SOFTWARE NOTES To Check the Software Version from the front panel Press Command Env1 The display shows NO COMMANDS ON PAGE e Repeatedly press the left or right arrow button until the display shows SOFTWARE INFORMATION Press Enter Yes The display shows RAM VERSION X XX press EntereYes the display shows ROM VERSION Y YY press Enter Y es the display shows KEYBOARD VERSION XXX for the Rack this will always read 1 BOOTUP ROM CHANGES The following change was
30. d ro e 9 FigureS Incorrect Power Supply Voltages flow chart ie ee 9 Display Display Self test Mode e o 10 Del Test Chatt boss Be ODER a Oe SRS SS 10 Troubleshooting Guide E aie Highs e Gag tap ah Fee ate See GE tk a Ss 11 Figure 6 Footswitch problem flowchart 2 2 2 2 12 Figure7 No LEDs Lit flow chart 2 0 2222 13 Figure 8 Some LEDs Lit flow chart a a a a a 14 Figure9 AJLEDsLit No Display flow chart 15 Most Commonly Asked User Questions 2 2 0 84 16 EPS 16 PLUS Test Procedure be POWELL TID G e a ia 8 Se D a a 22 Os 28 17 Zo Load in Sounds s s s kw ee OR Se ww OH G 17 3 Keyboard Test EPS 16 PLUS Keyboard Only 17 A DISKCBECK es cack a A a ds e BK Y 17 dy DOMO CHECK e m o ds a He 209 Se ee dee 3h 18 6 Mono Output and Headphone Test 18 7 MIDI Test EPS 16 PLUS Keyboard Only 18 8 Footswitch Test 18 9 Amalos Test Page s o s a ae ee aa AA A 19 LO Sampling Test lt a a AR Se el 2 a 8 4 19 11 Output Expander OEX 6 Test 19 12 ESP Effects test corsa a amp be e Bae e 26 20 13 ESP Effects Test2 cn tee a D Bw ESS BOS 20 EPS 16 PLUS Burn in Test Program 22 2 21 EPS 16 PLUS Service Manual Table of Contents 1 Table of Contents EPS 16 PLUS Hardware Notes
31. e screwdriver or similar object to remove this connector Due to the benefits of a high retention force connector we will be adding them in other places on the EPS 16 PLUS harness Watch out for them and please don t pull on the wires We have found that some units have developed further problems once a module has been changed This may be a result of improper handling of cables We suggest removing all cable connectors using the angled end of a scribe see below Figure 1 Scribe These can be found in the following catalogs Techno Tool catalog 38 page 204 part number 400PR 144 Newark catalog 110 page 1024 part number 76 1510 page 4 EPS 16 PLUS Service Manual Communications Path COMMUNICATIONS PATH Tt is important that you completely understand the communications path of the EPS 16 PLUS Please read this carefully The EPS 16 PLUS Main Board Keypad Display Board and Keyboard assembly are complete computer systems in themselves each with its own microprocessor and operating software The modules communicate with each other using serial communication ports Whenever a key is played on the Keyboard for example the Keyboard assembly microprocessor transmits this information to the microprocessor on the Main Board The Keypad Display Board communicates with the Main Board through the Keyboard assembly Whenever the Main Board wants to put a message on the Display it sends the message to the Keyboard assembly which then p
32. e damage to the Disk Drive or Keyboard assembly What disks t use It is very important to use double sided double density 3 5 micro floppy disks The EPS 16 PLUS 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 Testing the Disk Drive The best way to test the Disk Drive i is by formatting a disk When a disk is formatted the EPS 16 PLUS 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 some computer systems the EPS 16 PLUS does not automatically discard bad sectors when formatting The entire disk must be good for successful formatting See Hardware Notes Rack Only for notes about the Panasonic Disk Drive page2 EPS 16 PLUS Service Manual Important 5 OPERATING SYSTEM 0 S j An EPS 16 PLUS O S takes up approximately 170 blocks on a disk so without the O S on a disk you have more room for sounds The O S version on the disk can be easily updated call ENSONIQ Customer Service for the latest O S version You cannot copy the O S to a disk onto which you have already saved instruments or sequences but not the O S Attempts to do so will result in an error message 20 update O S Version on a floppy disk Insert the disk containing the O S you want to copy the so
33. e display will read PRESS EVERY BUTTON Press all the control panel buttons in any order All the LEDs will flash as each button is pressed don t forget to press the eight Instrument Track buttons Once all the buttons are pressed the display will read OK HIT ENTER TO START 9 Press Enter Yes to start the Burn in Test cycle As the Burn in Test runs the display will indicate which of the tests is currently active If the Dynamic Ram is being tested for example the display will read TESTING DYNAMIC RAM EPS 16 PLUS Service Manual page 21 EPS 16 PLUS Burn in Test Program BURN IN FAILURE MODES 1 If there is a failure in any of the tests the special segments in the display and the control panel LEDs will flash alternately The test cycle will continue 2 To determine which test has failed press CanceleNo When the test that is currently being performed is finished the display will indicate a PASS FAIL STATUS mode If the Dynamic Ram has passed for example the display will read DYNAMIC RAM GOOD 3 Pressing any of the arrow keys will cause the program to page through and display the pass fail status Of each of the eleven tests Once the failed test has been located you can clear the pass fail status mode by pressing CanceleNo This should be done ONLY as a diagnostic function Once all failure status indicators have been cleared press Enter Yes to restart the Burn in Test cycle at the displayed test 4 Pressing the Edit button
34. e power supply and the main board Turn the unit ON f Replace the Main Still wrong voltages NO B see Section A YES Figure 5 Replace the Power Supply Incorrect Power Board see Section D Supply Voltages EPS 16 PLUS Service Manual INCORRECT POWER SUPPLY VOLTAGES 0 pa Replace the Keypad Display Board see Section B N Replace the Keyboard KPC NO Simulator see Section C page 9 Display Self Test Mode DISPLAY SELF TEST MODE When the Keypad Display is receiving power from the Power Supply but is not in proper communication with the Main Board the Keypad Display Board enters Self test mode In Self test mode the Display remains blank until you press the buttons on the control panel Pressing various control panel buttons will cause the Display to print characters home the cursor etc Using Self test Mode to Diagnose the 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 control panel buttons are pressed according to the chart below this indicates the problem is either the Main Board or the communication link between the Main Board Keyboard assembly and the Keypad Display Board Before replacing anything check all connections particularly the 20 pin cable to the Keyboard assembly If pressing buttons causes only the leftmost character of the display to change this usually indica
35. ge it to AUX FT SWITCH START STOP right pedal to verify that sustain works then stop the sequencer using the sequencer left pedal Press Cancel No If the footswitches do not operate correctly see the flowchart on p 12 page 18 EPS 16 PLUS Service Manual EPS 16 PLUS Test Procedure 9 Analog Test Page a Plug Volume Pedal model CVP 1 into the PedaleCV jack b Goto the Analog Test Page press Command Env 1 scroll right until EXAMINE ANALOG INPUTS is displayed then press EntereYes c Examine the analog inputs using the following procedure Press the Up Arrow button to select the appropriate input then press Enter Yes to take a reading Verify that the values are as follows Controller Down Up Center 1 PITCH WHEEL 0 127 64 Rack always 0 2 MOD WHEEL 0 127 Rack always 0 3 VOLUME slider 0 127 4 PEDAL CV 0 127 unplugged 127 When testing the Data entry slider Mr Knob you must scroll right so that the value is underlined Press Enter Yes to take readings 5 MR KNOB data slider 0 255 Scroll left then up to test the Patch Select Buttons 6 PATCH select buttons bothup 0 nght 32 left 64 both 127 Failure indicates a problem with the corresponding part although it also could indicate a Power Supply failure or a Main Board problem If all readings are off then it is most likely a problem with the Main Board 10 er Test Plug the microphone into the Audio In Press Sample the display shows LOA
36. included in ROM Version 1 00B Keyboard only S N 10460 Extended the acceptable range of Mod wheel and other analog inputs The following change was included in ROM Version 1 00C Keyboard only S N 11646 This version of ROM supports loading the operating system from FLASHBANK The following change was included in ROM Version 1 00D Keyboard S N 12440 This version of ROM fixes a problem when the FLASH memory is completely filled 0 blocks free All EPS 16 PLUS Racks have at least this version The following change was included in ROM Version 1 00E Keyboard S N 12471 Rack S N 10290 A change was made to allow the CV pedal value on the Analog Test page go full range 0 127 EPS 16 PLUS Service Manual page 25 Software Notes The following change was included in ROM Version 1 00F Keyboard S N 13871 Rack S N 10738 A bug was fixed that caused a DISK TYPE ERROR when saving instruments to FLASHBANK The following changes were included in O S DISK VERSION 1 10 In version 1 10 the MULTI TRACK RECORD feature which was omitted from version 1 00 has been implemented In addition there are two additional refinements added as of v 1 10 to make the software a little more user friendly When you go into Record after loading or deleting instruments a condition that requires the EPS 16 PLUS to shuffle memory for a second or two the display will show SHUFFLING DATA until the click starts and it is ready to record Previously there w
37. into a stripped hole put a drop or two of LOCKTITE Super Glue Gel or RTV into the hole b Install the screw and tighten it only until the sub assembly being attached is snug against the case Do not tighten the screw any further When the glue sets the screws will hold the sub assembly tightly in place It is important to make sure that there are no loose screws inside the unit as they may come loose and short out something Brass Inserts To prevent stripping there are brass inserts in the Main Board ground boss mounting standoff and in the four control panel holes Be sure to use machine screws in these locations Do not use a self tapping screw in a brass insert as this will ruin the insert EPS 16 PLUS Service Manual page 3 Important 7 EPS 16 PLUS RACK SCREWS Because the Control Panel is an aluminum extrusion great care should be taken when assembling or disassembling any part of it To avoid stripping and to aid in alignment you should use no more than 8 inch lbs of torque and try to install the screws into the existing holes in the panel 8 HIGH RETENTION FORCE CONNECTORS Repair Technicians Label In all EPS 16 PLUS Racks and in later Keyboards there is warning information label just for you We just wanted to let you know that we have switched to a higher retention force connector on our transformers This means it will be very difficult to remove this connector by just pulling We recommend the use of a scrib
38. ng the Power cord 2 Remove the four 4 screws that fasten the control panel with a 2 5mm hex wrench NOTE These are machine screws 3 Place the unit upside down on a soft surface and remove the four 4 screws that attach the Wheel Assembly to the case See Figure 14 for location of screws 4 Return the unit to an upright position Raise the control panel and cut the wire ties that hold the wire harness to the chassis 5 Disconnect the main harness from the Main Board the Power Supply the Keypad Display and the line filter 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 the polarity Remove the Disk Drive and place it into the new assembly as described in Section H Reattach the Disk Drive cables Connect the new wire harness to a the Main Board J11 J13 J15 and ground lug b the Power Supply J1 J2 J3 and ground wire to the heat sink c the Keypad Display left sides and d the line filter ground lug paying particular attention to the alignment of pins and connectors 10 Reconnect the wire harness to the case using wire ties 11 Reattach the Wheel Assembly to the case using the four screws 12 Power up test the unit and close the control panel Installing O co NN page 32 EPS 16 PLUS Service Manual Replacing EPS 16 PLUS Modules KEYBOARD ONLY Re
39. o not pull on the wires 4 Remove the screw and star washer that connect the ground wire to the heatsink 5 Remove the two 2 screws and nuts that secure the Power Supply to the case note that there are star washers on each screw 6 Remove the Power Supply board by pulling the front of the board toward the Keyboard and then lifting it up so that the finned heat sink clears the case 7 Insert the replacement Power Supply Board into the case finned heat sink first Lift the finned heat sink from the outside of the case so that it is centered in the opening The standoffs are intended only for support and should not be stuck down to the case 8 Reinstall the Power Supply screws and star washers and be sure to connect the ground wire to the heat sink Carefully reconnect the four cables paying particular attention to the alignment of pins and connectors 9 Power up test the unit and close the control panel Installing EPS 16 PLUS Service Manual page 31 Replacing EPS 16 PLUS Modules KEYBOARD ONLY SECTION Replacing the Transformer Due to problems that may occur with the plastic case all units that need the Transformer replaced should be sent back to the factory Contact your distributor if you are located outside the U S Replacing the Pitch Mod Wheel Assembly The Pitch and Mod Wheels are replaced as an assembly along with the main harness cables 1 Remove all cables connected to the EPS 16 PLUS includi
40. oard assembly EPROM Version EPS 16 PLUS Keyboard only Each version of the Keyboard assembly EPROM is optimized for the hardware that is within the keyboard assembly For more information about the Poly Key Keyboard assembly see ENSONIQ Service Bulletins 9B and 11 The 20 pin Ribbon Cable Keyboard assembl C Simulator When reconnecting this cable to the Main Board make sure that the striped side is aligned with pin 1 and that the cable is not mis pinned If the cable is mis pinned or installed backward fuses F3 and F4 on the power supply board will blow NOTE If one fuse blows the other will also blow yen must replace both When installing the keyboard assembly back into the EPS 16 PLUS be sure that the keyboard assembly cable is flat under the keyboard assembly and that the ferrite bead is not trapped on top of the main board 4 THE DISK DRIVE Transporting a unit There is a printed label near the Disk Drive on every new unit shipped This label contains important information concerning the care of the EPS 16 PLUS Disk Drive and lists recommendations regarding the treatment of the drive during transport We do not under any circumstances recommend the insertion of an actual disk during transport Transport the unit only with nothing in the drive at all PLEASE DO NOT SHIP AN EPS 16 PLUS OR A REPLACEMENT DISK DRIVE IN A BOX PACKED WITH PEANUTS If you must wrap the entire unit in pague first These peanuts may cause sever
41. olve these situations over the telephone daily Question How do I Mix a Track or a Song CSR ey Sequences Tracks 1 Set RECORD MODE to ADD see Section 8 of the Musician s Manual 2 Select the Instrument Track 3 Press Edit then Track scroll left to MIX 4 Set mix to the desired value 5 Hold Record and press Play 6 Let the Sequencer play one bar 7 Press Stop 8 Answer YES to KEEP OLD NEW In Song Mode 1 Chain sequences into a Song 2 Set RECORD MODE to ADD 3 Select the InstrumenteTrack 4 Press Edit then Track scroll left to MIX 5 Hold Record and press Play 6 Mix Track through entire Song using the Data Entry Slider or the CV Pedal with PED VOL 7 Answer YES to KEEP OLD NEW Question The EPS 16 PLUS will not record a sequence from external sequencer in MULTI mode CSR You must have O S version 1 1 or higher Question Why won t the EPS 16 PLUS let me edit converted Mirage sounds CSR WS 1 contains the actual wavesample information for the Lower sound WS 17 for the Upper All other wavesamples 30 of them are copies of WS 1 or WS 17 Therefore isolate the desired wavesample s as follows 1 Create a new Instrument see Section 3 of the Musician s Manual 2 Create a new Layer in that Instrument see Section 7 of the Musician s Manual 3 Copy desired wavesample into the new Layer see Section 6 of the Musician s Manual 4 Truncate the new wavesample see Section 6 of the Musician s Manu
42. on A Replacing the Rack Main Board 4 2 2 2 37 Section B Replacing the Rack Keypad Display Board 38 Section C Replacing the Rack KPC Simulator Board a amp 39 Section D Replacing the Rack Power Supply Board 39 Section E Replacing the Rack Transformer 40 Section F ReplacingtheRackOEX 6Board 2 2 40 Section G Replacing the Rack Line Filter 2 41 Section H Replacing the Rack Disk Drive 2 41 Section J Replacing the Rack Memory Expander Board 42 Drawings Fioure 1 gt SOMbE s a ar a o sa E A 4 Figure 2 Communications Path 5 Figure3 AC Line Voltage Check Point 2 2 2 2 2 2 7 Figure 4 Power Supply Voltage Check Points 2 2 2 8 Figure 5 Incorrect Power Supply Voltages flowchart 9 Figure 6 Footswitch problem flow chart 2 2 2 2 12 Figure 7 NoLEDs Lit flow chart De As e v 13 Figure 8 Some LEDs Lit flowchart 2 14 Figure 9 Al LEDs Lit No Display flowchart 15 Figure 10 Trace cut for Rev A B or C Main Boards 23 Figure 11 Hardware Notes for the Rack only 24 Figure 12 EPS 16 PLUS Keyboard Exploded View 28 Figure 13 EPS 16 PLUS Button Colors 2 2 22 30 Figure 14 Bottom of C
43. ord 2 Remove the lid see Section A 3 Disconnect the 9 pin cables J1 J4 the 6 pin cable 33 and the 4 pin cable 32 from the Power Supply Board Note that these cables are keyed IMPORTANT The connector on the 9 pin cable from the transformer has a high retention force Please use a scribe screwdriver or similar tool to remove it see p 4 Do not pull on the wires 4 Carefully tip the unit onto its rear panel While holding onto the Power Supply AN with one hand remove the three screws from the bottom that attach it to the ase Remove the Power Supply board Insert the replacement Power Supply Board Reinstall the Power Supply screws Carefully reconnect the four cables paying particular attention to the alignment of pins and connectors Power up test the unit and reattach the lid see Section A Installing EPS 16 PLUS Service Manual page 39 Replacing EPS 16 PLUS Modules RACK ONLY Replacing the Rack Transformer Removing 1 Remove all cables connected to the EPS 16 PLUS Rack including the power cord Remove the lid see Section A Disconnect the transformer cables to the power supply line filter and power switch Remove the four screws and flat washers that hold the Transformer in place Insert the new Transformer and attach it to the base using the four screws and flat washers Reattach the cables to the power supply line filter and power switch Power up tes
44. ould read ENSONIQ EPS 16 PLUS then PLEASE INSERT DISK Insert O S disk The display should read LOADING SYSTEM The EPS 16 PLUS Keyboard unit only will then display TUNING KBD HANDS OFF When the keyboard is tuned all LEDs should go out 2 Load in Sounds see Section 1 of the EPS 16 PLUS Musician s Manual for more information a b Eject the O S disk Insert the Test disk Load bank IN OUT BURN from the test disk press Load Instrument Enter Yes The display will say LOADING lt filename gt and the top yellow LED red orange on the Rack will blink while loading The file is done loading when the display shows FILE LOADED and the top yellow LED red orange on the Rack stays on The following sounds will be loaded into the souent Track through 6 Instrument 1 PIANO 241 Instrument 2 PRESSURE Instrument 3 6 OUT TEST Instrument 4 20 VOX TEST Instrument 5 SAMPLE INST Instrument 6 3 BUS TEST 3 Keyboard Test EPS 16 PLUS Keyboard Only a b C d Select PRESSURE Instrument Track2 Play a chromatic scale across the entire keyboard Press each key down only until normal key travel ends Do not press into pressure zone Verify that no pressure effect occurs Press the key into the pressure zone and verify that pressure causes a pitch bend Using PRESSURE play all six C keys and verify that the puch rises 1 octave smoothly when the key is pressed down hard Failure indicates a Keyboard problem 4 Disk
45. our 4 screws and star washers that attach the Disk Drive to the wheel assembly Carefully slide the Disk Drive out of the wheel assembly Immediately place the defective drive in the anti static bag that the new drive came in 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 9 Reattach the wheel assembly to the case using the four screws 10 Power up test the unit and close the control panel Installing ao SAN UU A EPS 16 PLUS Service Manual page 33 Replacing EPS 16 PLUS Modules KEYBOARD ONLY NOTES page 34 EPS 16 PLUS Service Manual EPS 16 PLUS RACK ONLY EPS 16 PLUS RACK ONLY SECTION Contents Figure 14 PLUS Rack Exploded View Replacing Modules A RackMainBoard B Rack Keypad Display Board C Rack KPC Simulator Board D Rack Power Supply Board E RackTransformer F RackOEX 6 Board G RackLine Filter H RackDiskDrive as J Rack Memory Expander Board EPS 16 PLUS Service Manual page 35 Main Board Insulator G Ji ine Filter KPC Simulator Board O gt 2 Ground Strap Ls O D Power Supply Bc Chassis H Disk Drive x Disk Drive Mounting Bracket Headphone Jack Control Panel Figure 16 l EPS 16 PLUS Rack Exploded View page 36 EPS 16 PLUS Service Manu
46. ower supply voltages _ correct s the 7 pin 10 pin cable to the display board making a good connection Repair cable and retest Place scope ground on the left lead negative of C19 and probe on pin 4 of J15 DISPLAY there a 623KHz TTL level square wave present NO Replace the Main Board see Section A Replace the Keypad Display board see Section B Figure 8 Some LEDs Lit page 14 EPS 16 PLUS Service Manual Troubleshooting Guide ALL LEDS LIT NO DISPLAY Test the power supply unloaded Go to Incorrect Power Supply Voltages flow chart p 9 Are the power supply voltages correct Force the unit into self test mode Jumper the negative left side of C19 to pin 13 of U20 oes each button press correspond to the chart on p 10 Replace the Keypad Display Board see Section B Does only the leftmost character in the display change NO Replace the Main Board see Section A s the 20 pin ribbon cable to the keyboard OK xo Figure 9 All LEDs Lit No Display Replace the Keyboard KPC Simulator board see Section C EPS 16 PLUS Service Manual TROUBLESHOOTING AN EPS 16 PLUS WITH ALL LEDS LIT NO DISPLAY page I5 User Questions MOST COMMONLY ASKED USER QUESTIONS The following questions are the most commonly asked by end users Our Customer Service Representatives CSRs res
47. parameter corresponds to the left pedal of SW 5 only The SW 5 is the Dual Footswitch piano type available from ENSONIQ On the Edit SystemeMIDI page _ T SUSTAIN FT SWITCH AUX FT SWITCH Footswitch SW angle footswiteh or SW 5 left pedal right PATCH SL button sequencer START STOP ne oo If the footswitch mode is correct and the footswitch still doesn t function properly there is either a problem with the Main Board the Keyboard KPC or the 20 pin ribbon cable connecting the two Although the footswitch jack is mounted on the Main Board the footswitch signals are carried over to the Keyboard KPC by the oe ribbon cable where s are sensed by the Keyboard KPC microprocessor EPS 16 PLUS Service Manual page 11 Troubieshooting Guide TROUBLESHOOTING AN EPS 16 PLUS WITH A FOOTSWITCH PROBLEM Footswitch problem Are they set to the proper mode on the CMD System page All better now Set both footswitches to act as Patch Select Buttons Press Edit then System MIDI scroll to SUSTAIN FT SWITCH right or single pedal and press the up arrow button to set it to PATCH SL Scroll right once to AUX FT SWITCH left pedal and set it to PATCH SEL Select PIANO 241 Press Edit then double click on Instrument Pressing either footswitch should cause the appropriate patch indicator to change in the leftmost two characters of the display Is it workin g properly NO
48. placing the Line Filter 1 Remove all cables connected to the EPS 16 PLUS including the Power cord 2 Remove the four 4 screws that fasten the control panel with a 2 5mm hex wrench NOTE These are machine screws 3 Remove the three 3 wires connected to the back of the Filter paying particular attention to the polarity 4 Remove the two 2 screws and nuts that secure the Filter to the case Note that there are star washers on the inside only 5 Install the new Line Filter from outside the case using the two screws star washers and nuts 6 Reconnect the three wires to the Filter again noting the proper polarity Installing IMPORTANT Failure to connect the wires to their proper posts can lead to a potential shock hazard see Figure 3 7 Power up test the unit and close the control panel Replacing the Disk Drive Removing 1 Remove all cables connected to the EPS 16 PLUS including the Power cord 2 Remove the four 4 screws that fasten the control panel with a 2 5mm hex wrench NOTE These are machine screws 3 Turn the unit over top down and remove the four 4 screws that attach the Wheel assembly to the case See Figure 14 for location of screws Return the unit to an upright position and raise the control panel Carefully lift the wheel assembly out of the case Disconnect the two cables from the Disk Drive paying particular attention to the polarity see p 2 the Disk Drive Remove the f
49. rectly and should be plugged into a suitable line level pre amp such as a mixing board If the EPS 16 PLUS itself is defective the problem is in the Main Board EPS 16 PLUS Service Manual page 19 EPS 16 PLUS Test Procedure 12 ESP Effects Test 1 a Eject the O S disk and insert the Test disk b Press Load then Instrument Scroll to the Bank file FILE 2 FX TEST 1 and press _ Enter Yes Wait for all the instruments to load The following sounds will be loaded into the Instruments Track1 through 8 Instrument 1 PIANO 241 Instrument 2 ROOM REVERB Instrument 3 HALL REVERB Instrument 4 HIFI REVERB Instrument 5 DUAL DELAYS Instrument 6 HIFI DELAYS Instrument 7 PHASER REVRB Instrument 8 CHORUS REVRB c Select each instrument one at a time and play it Listen for ESP effects problems sound clarity noise etc Also watch for ESP download errors as an instrument is selected either a SYSTEM ERROR or the outputs playing dry instead of with effects Failure indicates a Main Board problem 13 ESP Effects Test 2 a Press Load button then Instrument Scroll to the Bank file FILE 3 FX TEST 2 and press Entere Yes Wait for all the instruments to load The following sounds will be loaded into the InstrumenteTrack1 through 8 N ictrum ne 1 PIANO 241 Instrument 2 FLANGER REV Instrument 3 CHOR REV DDL Instrument 4 ROT SPKR REV Instrument 5 CMP DIST REV Instrument 6 DIST CHO REV Instrument 7 WAH DIST REV Instrument 8 SPLA
50. rews Reconnect the two cables paying particular attention to the polarity Reinstall the knobs on the Data Entry and Volume sliders 7 Power up test the unit and close the control panel EPS 16 PLUS Service Manual page 29 Replacing EPS 16 PLUS Modules KEYBOARD ONLY 1 2 3 r 2 qe 1 coe 5a 4 5 6 E PM 7 8 9 arr PA ia de a 0 pan Page Data Entry Figure 13 EPS 16 PLUS Button Colors Volume Mode Replacing the Keyboard 1 Remove all cables connected to the EPS 16 PLUS including the Power cord 2 Remove the four 4 screws that secure the control panel with a 2 5mm hex wrench NOTE These are machine screws 3 Place the unit upside down on a soft surface and remove the ten 10 screws that attach the Keyboard to the case See Figure 14 for location of screws 4 Carefully turn the unit right side up Raise the control panel and disconnect the Keyboard Ribbon cable J12 from the Main Board paying particular attention to the polarity 5 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 pp 1 2 While paying particular attention to polarity remove the Keyboard Ribbon cable from the old Keyboard and install it on the new Keyboard 7 Connect the Keyboard Ribbon cable to the Main Board
51. s and Fr Sw jacks 2 Power up the unit and insert the BURN IN TEST DISK VER X X making certain that the disk is not write protected i e the window must be closed 3 Once the disk has been loaded the display will read DISK TEST COUNT XXX If no buttons are pressed the Burn in Test cycle will begin automatically after twenty seconds NOTE The Disk Test Counter is used to automatically monitor test disk usage and to indicate when a test disk becomes unreliable The counter is increased by one every time a DISK WRITE test is done After about two weeks of continuous Burn in Testing the counter will reach its limit and the disk will not boot the system properly Instead the display will read DISK NO LONGER USABLE Contact ENSONIQ Customer Service for a replacement disk 4 Press EntereYes The display will read DO BUTTON TEST NOTE If you wish press Cancel No to by pass the Button and Display tests and immediately begin the Burn in Test cycle The display will read OK HIT ENTER TO START Go to Step 9 to start the Burn in Test cycle 5 Press Enter Yes All the special segments on the left side of the display will light and the display will read LEFT SIDE ON HIT ENTER 6 Press Enter Yes All the special segments on the right side of the display will light and the display will read RIGHT SIDE ON HIT ENTER T dL aie Yes All the LEDs will light and the display will read LEDS ALL ON HIT 8 Press Enter Yes Th
52. t the unit and reattach the lid see Section A Nh WW N Installing QQ SECTION Replacing the Rack OEX 6 Board Removing 1 Remove all cables connected to the EPS 16 PLUS Rack including the power _ cord 2 Remove the lid see Section A 3 Disconnect the ribbon cable from the OEX 6 board 4 Remove the six 6 15mm nuts from the rear panel jacks marked Bus3 Right Bus3 Left Bus2 Right Bus2 Left Auxl Right and Aux1 Left 5 Pop the OEX 6 board from the two white standoffs by squeezing the standoffs 6 Remove the OEX 6 board from the unit Installing 7 With the new OEX 6 board tilted on a slight angle insert the jacks into the holes in the rear panel and snap the board onto the standoffs 8 Reconnect the ribbon cable from the main board making sure that the striped side is On pin 1 9 Secure the jacks with the nuts 10 Power up test the unit and reattach the lid see Section A page 40 EPS 16 PLUS Service Manual Replacing EPS 16 PLUS Modules RACK ONLY Replacing the Rack Line Filter Removing 1 Remove all cables connected to the EPS 16 PLUS Rack including the power cord 2 Remove the lid see Section A 3 Remove the three 3 wires connected to the back of the Filter paying particular attention to the polarity 4 Remove the two 2 screws and nuts that secure the Filter to the case Note that there are star washers on both sides _ 5 Install the new Line Filter from the inside of the
53. te the unit to the latest software EPROMs and disk EPS 16 PLUS Service Manual page 23 Hardware Notes EPS 16 PLUS RACK ONLY Dim Displays or Extra Segments S N 10000 to 10244 On early EPS 16 PLUS Racks there is a potential for the Display to short out to the front panel This can cause extra segments of the display to light or the whole display may appear dim To fix this problem remove the keypad display board from the front panel Place insulating tape along the flat inside edge of the front panel both top and bottom Reinstall the Keypad Display Panasonic JU 257 Disk Drive On early EPS 16 PLUS Racks that have a Panasonic JU 257 disk drive there is a potential for a short between the disk drive mounting bracket and the case of the disk drive that may cause audio noise during a floppy disk access There are two ways to fix this problem Place insulating tape on the sides of the drive to isolate the it from the mounting bracket or e Carefully remove desolder the surface mounted resistor labeled R130 from the disk drive PCB With the bezel closest to you PCB side up R130 is located on the right side of the PCB next to the PCB mounting screw t2 3 Main Board PEM threaded mounting standoff On some early units one main board screw was left out due to the misplacement of a Main Board mounting PEM Tf there is no screw in this location see Figure 11 don t insert one SCSI board 5 When installing a REV A SCSI bo
54. tes a defective cable connection 20 pin ribbon cable between the Main Board and Keyboard assembly or possibly a bad Keyboard assembly 2 If the unit is in Self test mode but the display does not respond according to the chart below the problem is most likely in the Keypad Display Board If certain buttons do not function properly during normal EPS 16 PLUS operation test them while the display is in Self test mode If you can t isolate a problem that seems related to the display the display can be forced into Self test mode using the following procedure With the power off face the front of the unit then Jumper the left side of C19 located below the MIDI Out jack to pin 13 of U20 WD1772 On power up the display will stay in Self test as long as the j jumper is connected allowing you to check the Keypad Display Board independently The Chart below details how the control panel buttons are mapped in Self test mode Pressi Display Reads Press isplay R 8 Down Arrow 4 COMAND Left Arrow EDIT 1 Right Arrow INSTRUMENT CANCEL NO SEQ SONG 3 ENTER YES Home Cursor SYSTEM MIDI 9 Instrumente Track 1 Space EFFECTS b Instrument Track 2 amp 1 ENV 1 Instrumente Track 3 2 ENV 2 0 Instrumente Track 4 2 3 ENV 3 1 Instrumente Track5 4 PITCH 6 Instrumente Track 6 Home Cursor 5 FILTER 7 InstrumenteTrack 7 5 6 AMP lt Instrumente Track 8 4 7 LFO EFFECT SELECT BYPASS 2 8 WAVE Home Cursor SAMPLE
55. tion on a note etc Select 3 BUS TEST Instrument Track 6 Press one key and you should hear 3 notes play in succession Failure indicates a main board problem 6 Mono Output and Headphone Test a b Hh 0 A Select PIANO 241 Instrument Track1 j Unplug the LEFT MONO output cable and verify that both the high and low end of the keyboard are heard in the RIGHT output there will be no output fromi the left Plug in the Left cable and unplug the RIGHT MONO output cable and verify that both the high and low end of the keyboard are heard in the LEFT output there will be no output from the right Plug headphones directly into headphone jack Play a few notes to check for stereo and sound quality Reconnect the audio cables Failure indicates a Main Board problem 7 MIDI Test EPS 16 PLUS Keyboard Only HO AO O P Select PRESSURE Instrument Track2 Connect MIDI In to MIDI Out with a MIDI cable Hold down a few keys Disconnect one end of the MIDI cable When you release the keys the notes should sustain Play twenty or more keys simultaneously to reinitialize the voic s Failure indicates a Main Board problem 8 Footswitch Tests Plug the Dual Footswitch into the Ft Sw jack on the back of the EPS 16 PLUS a b Press Edit the SystemeMIDI and scroll to AUX FT SWITCH OFF C d Create a short sequence by holding down Record and pressing Play Use the sustain Press the up arrow button to chan
56. urce disk into the floppy drive Press Command then System MIDI then 1 Envl The display shows COPY OS TO DISK e Press EnterYes The display says MUST ERASE MEMORY OK If you need to save any sounds or sequences press Cancel No and save the data before proceeding e Press EnterYes The display says READING OS INTO MEMORY and then INSERT FORMATTED DISK l Insert the disk onto which you want to copy the O S the destination disk into the floppy drive Press EnterYes The display shows WRITING OS TO DISK while the O S is being copied to the disk When it s done the display reads COPY OS DONE ANOTHER If you want to copy the same O S to another floppy disk insert another formatted disk and press EntereYes You can repeat this procedure as many times as you like When you are done press Cancel No 6 PLASTIC CASE EPS 16 PLUS Keyboard only Avoid Stripping Screws Because the structural components Base Control panel and Wheel cover are made of plastic great care should be exercised when assembling or disassembling any part of the EPS 16 PLUS 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 a Before replacing a self tapping screw or screws
57. was really looking at the hard disk but with the wrong disk label When an EPS classic bank was loaded the track PAN values were translated incorrectly in the presets SEQUENCER It was possible to edit track parameters when no Instrument was loaded e Click pan defaulted to 3 it should default to O center e On CHORUS REVERB algorithm click assigned to BUS3 still came out left channel when BUS3 OFF e Click assigned to BUS3 periodically snuck into BUS1 creating a reverb splash especially with 44K HZ effects e Overdub Standby state was not cleared when an unlooped sequence stopped EFFECTS Effects could howl when loading a bank with a playback rate different from the existing one On 44KHZ REVERB algorithm Detune Rate and Amt parameters were interconnected changing either one changed the other SAMPLING Entering and exiting sampling while holding keys and sustain pedal could confuse the unit causing sustain pedal to hang or be ignored or worse page 26 EPS 16 PLUS Service Manual EPS 16 PLUS KEYBOARD ONLY EPS 16 PLUS KEYBOARD ONLY SECTION Contents page Figure 12 16 PLUS Keyboard Exploded View 28 Replacing Modules A MainBoard 29 B Keypad Display Board 29 Figure 13 EPS 16 PLUS Button Colors 30 C Keyboard 30 Figure 14 Bottom of Case cda OL D Power Supply Board 31 E Transformer So sei dZ F PitchiIMod Wheel
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