Sequential Circuits Prophet-5 Service Manual - Audiofanzine
Sequential Circuits Prophet-5 Service Manual - Audiofanzine Sequential Circuits Prophet-5 Service Manual - Audiofanzine
TOPPANELASSEMBLYPCB3COMPUTEROSCILLATOR ANDFILTER CVDEMULTIPLEXERSAMPLE/HOLDSPCB4VOICESZ-80CPUNON-VOLATILEPROGRAM RAMVOICE 1VOICE 2EPROMVOICE 3SCRATCHPADRAMVOICE 4VOICE 5BOTTOMPANELASSEMBLYFINALVCAsMEMORY ANDI/O INTERFACELATCHESCOMMON ANDPATCH CVDEMU^riPLEXERSAMPLE/HOLDSP303/VOICEPOWERCABLEENVELOPEW2GENERATORSPCB 3/4INTERCONNECTPOLY-MOD/FILTERENVELOPEVCAsPOLY-MODOSCBVCAsAUDIO3OUTPUTMIXER P402/AUDIOOUTPUTCABLEFigure 1-0SERVICE POSITION
Raise the top panel assembly to service position shown. For best stability both top panel side back edgesshould rest on the bottom panel. Actually, the top panel upper edge rests on the back panel cable. Thisisnormal; but a small (half-inch) prop may be added to improve stability.The instrument can operate normally in this position. Of course its operating temperature will be farbelow normal. This may slightly affect adjustments or the performance of certain ICs.IREMEMBER THAT IN SERVICE POSITION THE TOP PANEL ASSEMBLY BALANCES ON ITS REAR EDGES.DONT UPSET THIS BALANCE BY PUSHING TOO HARD WHEN PROBING OR TRIMMING.When reassembling the Prophet, turn instrument over and firststart two large screws near front feet.Then start bottom and back panel screws to obtain overall alignment before tightening all screws.1-3 PCB 4 VOICE BOARDPCB 4 may be swung-out and operated under power. For this set-up, switch power off, remove screwsidentified in Figure 1-0 in the order suggested, and position board on insulation as shown in Figure 1-1.^-^^jv.^^^^^•^^-.•^ ^^. ^Figure 1-1PCB 4 SWINCOUTINSULATIONCOMMONANALOGTO PREVENT.GROUND LOOPS, PCB 3 IS GROUNDED ONLY THROUGHTHE AUDIO CABLE TO THEBACK PANEL. THEREFORE, WHENEVER THE AUDIO CABLE iS DISCONNECTED, PCB 3 MUST BE TIEDTO THE BACK PANELCAREFUL! DONT ALLOW PCB 4 TO SHORT AGAINST STANDOFFS FROM PCB 3 OR AGAINST THEBOTTOM PANEL.To remove W2, completely switch power off and disconnect voice power cable at P303 on PCB 3 (seeFigure 1-0). Also remove PCB 3/4 interconnect at P401 on PCB4, with a gentle "see-saw" motion. Detachaudio output cable from P402.When reconnecting voice power and audio output cables, be sure tabs interlock. Also be sure the PCB3/4 interconnect is correctly mated and firmly seated at P304 and P401.1-3Lri
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- Page 3 and 4: PROPHET-5 SYNTHESIZERTECHNICAL MANU
- Page 5 and 6: iJTable of ContentsISECTION 1MECHAN
- Page 7: '1SECTION 1MECHANICAL1-0 GENERALThi
- 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
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- Page 23 and 24: ajMim—2-8 AUDIO OUTPUTAs shown in
- Page 25 and 26: .'2-10 MICROPROCESSOR, MEMORY, AND
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- Page 29 and 30: 2-12 ADC, DAC, AND CV OUTPUTSThe DA
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- Page 33 and 34: the same CV and trigger pattern to
- Page 35 and 36: SECTION 3DOCUMENTS3-0 DOCUMENT LIST
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TOPPANELASSEMBLYPCB3COMPUTEROSCILLATOR ANDFILTER CVDEMULTIPLEXERSAMPLE/HOLDSPCB4VOICESZ-80CPUNON-VOLATILEPROGRAM RAMVOICE 1VOICE 2EPROMVOICE 3SCRATCHPADRAMVOICE 4VOICE 5BOTTOMPANELASSEMBLYFINALVCAsMEMORY ANDI/O INTERFACELATCHESCOMMON ANDPATCH CVDEMU^riPLEXERSAMPLE/HOLDSP303/VOICEPOWERCABLEENVELOPEW2GENERATORSPCB 3/4INTERCONNECTPOLY-MOD/FILTERENVELOPEVCAsPOLY-MODOSCBVCAsAUDIO3OUTPUTMIXER P402/AUDIOOUTPUTCABLEFigure 1-0SERVICE POSITION