Sequential Circuits Prophet-5 Service Manual - Audiofanzine

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Inpreparation for service, set up the <strong>Prophet</strong> as follows:1. Connect mono phone-plug between back panel AUDIO OUT jack and power amplifier.2. Check back panel 115/230 line voltage selector.3: Check that back panel power switch is off.I4. Connect power cord to properly-grounded outlet.5. Switch power on. The power switch should light. TUNE switch on control panel will initially light.After ten seconds, PRESET mode and BANK-PROGRAM 1-1 "comes up." If not, check fuse:115V— 3/4A SLO BLO: 230V-1/2A SLO BLO.6. Center PITCH wheel and MOD set wheel to minimum.7. To be safe, SAVE the current program file through the CASSETTE interface. (Better yet, insist owners"back-up" before delivering the machine for service.)6. Set back panel RECORD ENABLE/DISABLE switch to DISABLE to protect NV RAM.9. Adjust VOLUME as required.See Section 1 for mechanical procedures required for service. Sealent can be easily pulled off oftrimmers with needle-nose pliers. Be sure to reseal any trim setting you change. It is customary to installsockets when replacing soldered ICs. Also note that the <strong>Prophet</strong> presets to 1-1 whenever power isswitched on. This means you may have to check the controls whenever you power up—after swingingout PCB 4. for example.MPORTANT! WHENEVER THE AUDIO CABLE IS DISCONNECTED, PCB 3 MUST BE GROUNDED TOTHE BACK PANEL.4-2 D-2
4-1 OSCILLATOR A TEST:STtP MODULE CONTROL SETTING NORMAL INDICATIONS/COMMENTS1PRGMRPRSTTUNEOFFONSET CONTROLS ACCORDING TO FIGURE 4-1.WHEN DONE, PLAY HIGHEST KEY (C5) AND REMEMBERPITCH,OSC A FREQ 10OSC A FREQ 0-10OSC AOSC BSYNCKBDONON7 OSCA FREQ 0-10 SYNC FUNCTION8 OSCA FREQ 4 NORMAL KEYBOHOLD SECOND C (CI) FROM BOTTOM (CO). SAME PITCHAS STEP 2.PITCH ADJUSTS IN SEMITONES OVER 4-OCTAVE RANGE.CHECK THAT EACH OSC PLAYS IN TUNE OVER FULL9-OCTAVE RANGE.—, -»^.wm .* « 4 4 f^a ft «tt ft^rq*D D D:^-: -.fj-- . A A n:*:• n D:*-: D D D D Dm^J HCHLfllD* ' "%•#: I n :;• n- * * * * • ^ A n:.p) >:• D Q D4*44- 1-^ -«-P4- ...^- ^- * * - ' . * * •11^ '4l[B'1'^1< * # P * - - * *•;%; •.^; '.^;-»» ,*, -*i 4**4tlA«ft auA*^ hrtf«i« •ffti'ti^ ^"^-^h\'Wft«»ftftf«4 tM^IftD n D [vn D11IDDDDDDD*i44«tCftBBfVTl .vD D D* • « ^ ft 4*4^^^ '^^ ^J^:4 * i1:9 OSCB KBD OFF10 OSCA SYNC OFF11 OSCA SAW OFF12 OSCA PULSE ON13OSCAPW 0-10PULSE DEGENERATES NEAR SAME EXTREME KNOBSETTINGS FOR ALL VOICES.Figure 4-1OSC A TEST PATCHRELATED TRIMS: 4-14DAC GAIN, ADC GAIN, SEQ INTERFACE4-16 VCO SCALE
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iJTable of ContentsISECTION 1MECHAN
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Page 11 and 12: 1-5 PCB 1/2 CONTROL PANELSOnce PCB
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Page 35 and 36: SECTION 3DOCUMENTS3-0 DOCUMENT LIST
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Page 64 and 65: 4-8 POLY-MOD TEST—A.STEP MODULE C
Page 66 and 67: i4-11 PITCH WHEEL TRIMThis trim rem
Page 68 and 69: A)I4-16 VCO SCALE TRIMBE SURE RECOR
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Page 72 and 73: 4-21 FINAL VGA BAL1. Switch PRESET
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Page 100 and 101: t J IISECTION 10REVISION 3.1 and 3.
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SECTION 13PROPHET-5 REV 3.3 UPDATET
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Sequential Circuits Prophet-5 Service Manual - Audiofanzine

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