Sequential Circuits Prophet-5 Service Manual - Audiofanzine

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4-19 FILTER ENVELOPE AMOUNT VCA BALANCE1. Switch PRESET off and set controls according to Figure 4-8,2. Switch FILTER KEYBOARD off.3. Probe TP303 FILT CV at hole just above U350 and adjust FILT CTF knob to read approximately 5.75V.4. Probe U433-7 VOICE 1 FILT FREQ SMR by clipping to the right end of R4145.5. Note reading (e.g., .063V), then turn FILT ENV AMTto 10. Trim R495 for same reading as with FILTENVAMT knob set too.6. Trim Voices 2 - 5 in the same way, referring to Table 4-3.Table 4-3FILTER ENVELOPE AMOUNT VCA BALANCEVOICEOTAPROBETRIMMER12345U433-7U434-14U434-1U434-7U434-8R4145R4146R4149R4154R4157R495R497R499R4101R41034-20 FILTER TUNINGNUit: 11 Rev 3.0 Software level is V.8.1, (original) and VCO SCALE TRIM has beenperformed, switch power off then back on to reset the A-*«0 port (otherwSe thCreference will be left tuned to "C"). If V.8.2 is installed, powe^reset wm ^^^rout?n?'^'^ '""'"^ '^'' '' automatically reset when exiting SCALE TRIMA scope Is required for this trim.Note that there is no computer-correction of filter tuning as there is for the oscillators, so the filters willnever track as well as the oscillators. There Is also no temperature compensation, so the filters will alwaysdrift a certain amount. For this reason, filter tuning can degrade as soon as five minutes after tuning Thefilters are gam-matched, with the set code written on PCB 4 just above U469 (e.g. 3.60 - 3.64), Include thisset code when ordering replacement filters.1. Switch PRESET off and set controls according to Figure 4-5.2. Switch UNISON on.I3. Probe TP303 FILT CV at hole just above U350 and adjust FILT CTF knob to read as close to 2 OOOV asthe quantized voltage steps will allow.4. Switch A-440 on.left end of R4498.4406. Probe U474-7 FILT output buffer by clipping on to left end of R4500.7. Alternately play A3 and A4 (highest A) while tuning R4501 INIT FREQ (OFFSET) and R4133 FILTSCALE for 440- and 880-Hz. The two trimmers Interact, so repeat until no improvement isSee Waveform 4-0.oossible8. Trim Voices 2 - 5 in the same way, referring to Table 4-4.4-14D.2
J440-H2REFERENCEFILTER INRESONANCE(A3 HELD)V = .IV/divH = 5 ms/divWaveform 4-0FILTER TUNINGTaWe 4-4FILTFR TUNING TRIMMERSVOICE FILT BUFFER PROBE INIT FREQ SCALI1 U 474-1 R4500-R GHTEND K4501 R41332 U475-1 R4506-LEFTEND R4504 R41343 U475-7 R4508-RIGHT END R4509 R4135R4514-LEFT ENDR4512 R41364 U 476-15 U476-7R4516-RIGHTENDR4517R4137D.2 4-15
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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
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Figure 1-5KEYBOARD REMOVAL1 -7/1 -8
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TOADDITIONALVCOsTOADDITIONALENV GEN
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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
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Page 56 and 57: IU504ft50647C5042Z00|iFMCTBMtZCT2 1
Page 58 and 59: Inpreparation for service, set up t
Page 60 and 61: 4-2 OSCILLATOR B TESTSTEP MODULE CO
Page 62 and 63: 4-S FILTER TEST.STEP'MODULE CONTROL
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
Page 72 and 73: 4-21 FINAL VGA BAL1. Switch PRESET
Page 74 and 75: 115-3 PCB 3BT301 E-040L-\:!Oi 0-U45
Page 76 and 77: I ]U374U375U376U377U37SU379U380U381
Page 78 and 79: 1R419SR4199R4200R4201R4202R4203R420
Page 80 and 81: 51» IR44S7/488 R-025R44S9 R-009R44
Page 82 and 83: kL096 E-066098 E-071100 E-078102 E-
Page 84 and 85: IJ310 M-156312 M-157314 M-158316 M-
Page 86 and 87: JJ51S R-161520 R--162522 R-163524 R
Page 88 and 89: FFFFDBKFETFFFILTFINFINEFOAFREQFSKFT
Page 90 and 91: 11 IJSECTION 8THEORY8-0 INTRODUCTIO
Page 92 and 93: 1 1for the 2 to 5-foot range. The c
Page 94 and 95: IiSECTION 9PRCX^RAMMING9-0 INTRODUC
Page 96 and 97: I3JIJThe Prophet will not accept st
Page 98 and 99: ByteByte 23Switch Bit (7)OSC A PULS
Page 100 and 101: t J IISECTION 10REVISION 3.1 and 3.
Page 102 and 103: I+ I5V+5dI^1-+5V 2'2pF+I6V+5V^^' U3
Page 104 and 105: T&=* PANEL ASSE^^mtYSAfKEYBOARD,'r-
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Page 108 and 109: 4/J«-5[E> -TUNER57a12wzofwiOi^^^^^
Page 110 and 111: —T8502J/fRSOBWMfrS/IC5045.iiU502i
Page 112 and 113: ^ 1 1 ;4 PINFigure II-OFigure11-TM1
Page 114 and 115: I 111-2 REVISION 3.0 MEMORY TESTRev
Page 116 and 117: Tr1 1-5 WHEEL BALANCE TRIM1. See pa
Page 118 and 119: SECTION 13PROPHET-5 REV 3.3 UPDATET
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iFigure 13-1PCB 3 TOP MODIFICATIONT
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tV t IEPROM1000.3.0V.8.0V.8.1V.8.21
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IJmemory interface1000.3.01000.3.11
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ittKRAM, non-volatile (NV)1000.3.01
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1voltage-current convertervoice ass
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Sequential Circuits Prophet-5 Service Manual - Audiofanzine

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