Sequential Circuits Prophet-5 Service Manual - Audiofanzine

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4-8 POLY-MOD TEST—A.STEP MODULE CONTROL SETTING NORMAL INDICATIONS/COMMENTS1PRGMRPRSTOFF SET CONTROLS ACCORDING TO FIGURE 4-8.23P-MODP-MODFREQAPWAON/OFF NO OFFSET (LEAVE OFF)ON/OFF NO OFFSET {LEAVE OFF)456891011P-MODP-MODP-MODP-MODP-MODP-MODFILTOSCBFILTFREQAFIL ENVENVOSCBOSCBDECTRION/OFF NO OFFSET (LEAVE OFF)ON0-100-105ONNO OFFSETNO OFFSET-— *t^4« mmm^m ^ - —•;^;D n D—.1» —— 1A A n.;^cm D1n D^D^^^^—^ «aciLL4riK -—-D I :*;•^- "D-:• -• ^ r\ JL 4 A*^^ > >P':-.p>': D D G •;} DLtfl*41it 1«4"-«FfL^f4 4 «f ^1ftVV||«#l ABVh^l^^ -f- '-f:^'-^f.¥ D D a D US D D D D D DftC4AT«WI*: D* i . *4ftHMHiritllDTrtD*^ ^« % ^n4WC*QIlVI* n^ 1/D12P-MODFIL ENV2DESCENDING FREQ13P-MODFIL ENV4DESCENDING FREQ14P-MODFIL ENV10SIMILAR151617P-MODP-MODP-MODFIL ENVOSCBOSCB410MODSIMILARFigure 4-8POLY-MOD TEST PATCH18P-MODOSC B19P-MODFREQAOFF2021P-MODOSC APWAPWON222P-MODFIL ENV4PW-SWEEP23P-MODFIL ENV1024P-MODFIL ENV2526P-MODP-MODOSCBOSCB410MOD27P-MODOSC B282930P-MODP-MODOSCAPWAFILTPULSEOFFONOFF35 P-MOD FIL ENV36 P-MOD OSC BMOD31FILTCTF437= P-MOD OSC B1032FILTRES1038' P-MOD OSC B3334P-MODP-MODFIL ENVFIL ENV410DESCENDING RES FILT SWEEPSIMILARRBlATED TRIMS: 4-17POLY-MOD FILTER ENVELOPE VCA BALANCE4-18 POLY-MOD OSCILLATOR B VCA BALANCED.2
4-9 FINAL TEST1. Check that the back panel RECORD switch is DISABLEd.2. Press RECORD. It should not light.3. If necessary, load custom or factory programs through the Cassette Interface.4. Select a program.5. Patch SEQUENCER VOLTAGE OUTjack to FILTER CONTROL VOLTAGE IN and check for increasedbrightness across entire keyboard.6. Move connector from FILTER CONTROL VOLTAGE IN to AMPLIFIER CONTROL VOLTAGE IN.Volume should increase as you play up from the bottom of the keyboard.7. Move connector from AMPLIFIER CONTROL VOLTAGE IN to SEQUENCER VOLTAGE IN.8. Patch SEQUENCER TRIGGER OUT to SEQUENCER GATE IN. Check for function and offset.9. Remove both SEQUENCER INTERFACE cords.10. Connect footswitch to RELEASE FOOTSWITCH jack.11. With factory program 1-4 or similar selected, play and check for footswitch function, (SwitchRELEASE off.)RELATED TRIMS: 4-14DAC GAIN, ADC GAIN, AND SEQ INTERFACE4-21 FINAL VGA BALANCE4-22 VOICE VOLUME4-10 POWER SUPPLY TRIMGENERALLY, THE POWER SUPPLY SHOULD NOT BE ADJUSTED UNLESS ITHAS BEEN REPAIRED,READJUSTMENT WILL OFFSET ALL OTA BALANCES, WHICH WILL THEN HAVE TO BE RE-TRIMMED.1. With power off, unscrew the box and slide the top panel assembly forward as discussed inparagraph 1-2, but do not raise to service position.2. For component location see PP531. For schematic, see SD531.3. Switch power on.4. Probe +15V where marked on PCB 5 and adjust R508 to read +15.000V.5. Probe -15 where marked on PCB 5 and adjust R501 to read -15.000V.6. Repeat steps 4 and 5 as required. (It is probably not possible to make these settings perfect.)ITO TRIM, THE SUPPLY MUST BE FULLY LOADED.AFTER REPAIR, CHECK POWER SUPPLY OUTPUT BEFORE INSTALLING, BUT DO NOT OPERATE THEUNLOADED SUPPLY FOR LONG PERIODS WITHOUT HEAT-SINKING THE REGULATORS. NEVEROPERATE THE SUPPLY UNDER LOAD WITHOUT HEATSINKING.WHEN INSTALLING, BE SURE REGULATOR TABS ARE FLAT AGAINST THE HEATSINK AND THE MICAINSULATOR IS WELL-COATED ON BOTH SIDES WITH THERMAL COMPOUND. BEFORE APPLYINGPOWER, CHECK REGULATOR INSULATION FROM BACK PANEL WITH OHMETER. ALL OUTPUTSSHOULD READ "INFINITE" RESISTANCE.4-9
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PROPHET-5 SYNTHESIZERTECHNICAL MANU
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iJTable of ContentsISECTION 1MECHAN
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'1SECTION 1MECHANICAL1-0 GENERALThi
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Raise the top panel assembly to ser
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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 25 and 26: .'2-10 MICROPROCESSOR, MEMORY, AND
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Page 35 and 36: SECTION 3DOCUMENTS3-0 DOCUMENT LIST
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Page 60 and 61: 4-2 OSCILLATOR B TESTSTEP MODULE CO
Page 62 and 63: 4-S FILTER TEST.STEP'MODULE CONTROL
Page 66 and 67: i4-11 PITCH WHEEL TRIMThis trim rem
Page 68 and 69: A)I4-16 VCO SCALE TRIMBE SURE RECOR
Page 70 and 71: 4-19 FILTER ENVELOPE AMOUNT VCA BAL
Page 72 and 73: 4-21 FINAL VGA BAL1. Switch PRESET
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Page 90 and 91: 11 IJSECTION 8THEORY8-0 INTRODUCTIO
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Page 100 and 101: t J IISECTION 10REVISION 3.1 and 3.
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I 111-2 REVISION 3.0 MEMORY TESTRev
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Tr1 1-5 WHEEL BALANCE TRIM1. See pa
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SECTION 13PROPHET-5 REV 3.3 UPDATET
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iFigure 13-1PCB 3 TOP MODIFICATIONT
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