Sequential Circuits Prophet-5 Service Manual - Audiofanzine
Sequential Circuits Prophet-5 Service Manual - Audiofanzine Sequential Circuits Prophet-5 Service Manual - Audiofanzine
1SECTION 5PARTS5-05-15-25-35-45-55-6CHASSIS 5-1PCBPCB 2 5.1PCB 3 ...........5-2PCB 4 5.4PCS 5s-^'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.5-8BILL OF MATERIALS (TOTAL ITEMS) 5-9SECTION 6GLOSSARYSECTION 7APPENDIXCA3280 Dual Operational Transconductance AmplifierCEM 3310 Voltage Controlled Envelope GeneratorCEM 3320 Voltage Controlled FilterCEM 3340/3345 Voltage Controlled OscillatorSECTION 8THEORY8-0 INTRODUCTION8-1 REVISION 3.1 COMPUTER and POWER SUPPLY8-2 REVISION 3.2 COMPUTER and USART8-3 REVISION 3.2 ANALOG and POWER SUPPLY8-18-18-28-^SECTION 9PROGRAMMING9-0 INTRODUCTION9-1 Data Format9-2 Error Checking9-3 Status Bytes9-«f STATUS 0: SEND KEYBOARD and PROGRAM9-5 STATUS 1: ACK, RECEIVE KEYBOARD and PROGRAM9-6 STATUS 2: TRANSPOSE ON9-7 STATUS 3: SAVE TO TAPE9-8 STATUS U: LOAD FROM TAPE9-9 STATUS 5: CLEAR TRANSPOSE9-10 STATUS 6: INITIALIZE SEQ LOWER PROGRAM9^11 STATUS 9: DISABLE TUNE9-12 STATUS A: ENABLE TUNE9-13 STATUS B: RECEIVE PROGRAM CHANGE9-1^* STATUS C: SYSTEM CONNECT9-15 STATUS E: RECEIVE SHORT KEYBOARD DATA9-19-19-29-29-39-39-59-59-69-69-69-69-69-6SECTION 10DOCUMENTS10-0 DOCUMENT LIST10-1SECTION 11SERVICE1 1-0 INTRODUCTION11-1 REVISION 3.2 RETROFIT KIT INSTRUCTIONS11-2 REVISION 3.0 MEMORY TEST11-3 REVISION 3.1 MEMORY TESTll-'f REVISION 3.2 MEMORY TEST11-5 WHEEL-MOD BALANCE TRIM11-111-111-511-6SECTION 12PARTSREVISION 3.2 COMPONENTS
'1SECTION 1MECHANICAL1-0 GENERALThis section shows how to remove the Prophet's main assemblies. Not all of the procedures given hereshould be necessary at any one time. For some service situations you will only need to separate the topand bottom panel assemblies and arrange them as shown in Figure 1-0. This configuration, discussed inparagraph 1-2, allows access to ail trimmers on PCB 4 and most trimmers on RGB 3. However, for someRGB 3 trims you will have to swing-out or completely remove PCB 4, as discussed in paragraph 1-3.1-1 PRECAUTIONSObserve the following precautions when working on the Prophet:SWITGH POWER OFF AND GHEGK 115/230V SWITGH ON BAGK PANEL BEFORE GONNECTINGPROPHET TO ROWER OUTLET OR AMPLIFIER.NEVER TOGGLE 115/230V SWITGH WITH POWER ON,TRIMMING, OF GOUR5E, MUST BE PERFORMED WITH ROWER ON. SO AVOID THE POWER SUPPLYPRIMARY GIRGUITRY, WHIGH GONDUGTS LETHAL VOLTAGE.SWITGH POWER OFF BEFORE DISCONNECTING OR CONNECTING ANY CIRCUITRY, ORREMOVING OR INSTALLING RGBs.IMPORTANT! WHENEVER THE AUDIO GABLE IS DISCONNECTED, RGB 3 MUST BE GROUNDED TOTHE BACK RACK PANEL.DO NOT BEND OR STRAIN THE RGBs, OTHERWISE MAY CAUSE TINY BREAKS IN THE PRINTED-CIRCUIT TRACES WHICH WILL BE EXTREMELY DIFFICULT TO FIND.TO REPLACE SOLDERED COMPONENTS SWITCH POWER OFF, REMOVE THE PCB COMPLETELYFROM THE INSTRUMENT AND DESOLDER FROM BOTH SIDES. USE A VACUUM SYRINGE OR DIPDESOLDERER. KEEP VACUUM SYRINGES CLEAN TO PREVENT THEM FROM SPRAYING MOLTENSOLDER. DON'T OVERHEAT THE PADS. WORK CAREFULLY!1-2 SERVICE POSITIONTO PREVENT DAMAGE TO THE TOP PANEL, KEYBOARD, OR WOODWORK, USE A CARPETTED ORSIMILARLY-COVERED WORK SURFACE WHEN OPENING THE BOX.To5et up the Prophet for service first switch power off, unplug power cord, and turn instrument over toexpose bottom panel. Remove two large screws near front feet. Remove eleven screws aroundperimeter of bottom panel.Holding top and bottom panel assemblies together, turn the Prophet right-side-up again. Remove fourscrews along top edge of back panel. Slowly slide the top panel assembly forward—about nine inches—so when raised the control pane! will clear the large power supply capacitors.1-1
- Page 1 and 2: ^^. ^ ^s .y ^,-j?^ ^^w^-^>&i^^^V^?v
- Page 3 and 4: PROPHET-5 SYNTHESIZERTECHNICAL MANU
- Page 5: iJTable of ContentsISECTION 1MECHAN
- Page 9 and 10: Raise the top panel assembly to ser
- Page 11 and 12: 1-5 PCB 1/2 CONTROL PANELSOnce PCB
- Page 13 and 14: Figure 1-5KEYBOARD REMOVAL1 -7/1 -8
- Page 15 and 16: TOADDITIONALVCOsTOADDITIONALENV GEN
- Page 17 and 18: 2-2 THE PROPHETThe Prophet is a sub
- Page 19 and 20: COMMON ANALOGVOICE(VOiCES e-5 ARE S
- Page 21 and 22: 'IAll processed CVs originate from
- Page 23 and 24: ajMim—2-8 AUDIO OUTPUTAs shown in
- Page 25 and 26: .'2-10 MICROPROCESSOR, MEMORY, AND
- Page 27 and 28: For troubleshooting, it should be e
- Page 29 and 30: 2-12 ADC, DAC, AND CV OUTPUTSThe DA
- Page 31 and 32: iirH- - jMg 1— -^ 'iVMUX, U201-3^
- Page 33 and 34: the same CV and trigger pattern to
- Page 35 and 36: SECTION 3DOCUMENTS3-0 DOCUMENT LIST
- Page 37 and 38: TOP PANEL ASSEMBLY1CHASSiSLAST \NOT
- Page 39 and 40: TB/0i/20f 32 22 30 20 19 25 233 2 I
- Page 41 and 42: TBZOf/^fOtP^2C20ZTBZOI/IOl17FUT ATK
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- Page 47 and 48: 1+ I5V£/JJiJ-5|T> -TUNEWBOtWfOiAMP
- Page 50 and 51: P40I+I6V(TUNE MUX)P40iP40f3ft wMIK
- Page 52 and 53: + I5VOSCP40i^Q ^ |PMOPFR£QASFINAL
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'1SECTION 1MECHANICAL1-0 GENERALThis section shows how to remove the <strong>Prophet</strong>'s main assemblies. Not all of the procedures given hereshould be necessary at any one time. For some service situations you will only need to separate the topand bottom panel assemblies and arrange them as shown in Figure 1-0. This configuration, discussed inparagraph 1-2, allows access to ail trimmers on PCB 4 and most trimmers on RGB 3. However, for someRGB 3 trims you will have to swing-out or completely remove PCB 4, as discussed in paragraph 1-3.1-1 PRECAUTIONSObserve the following precautions when working on the <strong>Prophet</strong>:SWITGH POWER OFF AND GHEGK 115/230V SWITGH ON BAGK PANEL BEFORE GONNECTINGPROPHET TO ROWER OUTLET OR AMPLIFIER.NEVER TOGGLE 115/230V SWITGH WITH POWER ON,TRIMMING, OF GOUR5E, MUST BE PERFORMED WITH ROWER ON. SO AVOID THE POWER SUPPLYPRIMARY GIRGUITRY, WHIGH GONDUGTS LETHAL VOLTAGE.SWITGH POWER OFF BEFORE DISCONNECTING OR CONNECTING ANY CIRCUITRY, ORREMOVING OR INSTALLING RGBs.IMPORTANT! WHENEVER THE AUDIO GABLE IS DISCONNECTED, RGB 3 MUST BE GROUNDED TOTHE BACK RACK PANEL.DO NOT BEND OR STRAIN THE RGBs, OTHERWISE MAY CAUSE TINY BREAKS IN THE PRINTED-CIRCUIT TRACES WHICH WILL BE EXTREMELY DIFFICULT TO FIND.TO REPLACE SOLDERED COMPONENTS SWITCH POWER OFF, REMOVE THE PCB COMPLETELYFROM THE INSTRUMENT AND DESOLDER FROM BOTH SIDES. USE A VACUUM SYRINGE OR DIPDESOLDERER. KEEP VACUUM SYRINGES CLEAN TO PREVENT THEM FROM SPRAYING MOLTENSOLDER. DON'T OVERHEAT THE PADS. WORK CAREFULLY!1-2 SERVICE POSITIONTO PREVENT DAMAGE TO THE TOP PANEL, KEYBOARD, OR WOODWORK, USE A CARPETTED ORSIMILARLY-COVERED WORK SURFACE WHEN OPENING THE BOX.To5et up the <strong>Prophet</strong> for service first switch power off, unplug power cord, and turn instrument over toexpose bottom panel. Remove two large screws near front feet. Remove eleven screws aroundperimeter of bottom panel.Holding top and bottom panel assemblies together, turn the <strong>Prophet</strong> right-side-up again. Remove fourscrews along top edge of back panel. Slowly slide the top panel assembly forward—about nine inches—so when raised the control pane! will clear the large power supply capacitors.1-1
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