Sequential Circuits Prophet-5 Service Manual - Audiofanzine

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SECTION 4SERVICE4-0 GENERALThis section contains detailed service instructions for complete functional testing and for alladjustments. Instruments to be serviced should be thoroughly tested beforehand. This will verify amalfunction has indeed occured, perhaps reveal related or unrelated malfunctions, and provide a basisfor troubleshooting. The tests suggest trims v^hich may restore normal functions. If the problem(s)persist, you will have to rely on Sections 2 and 3 and your troubleshooting skills to locate the defectivecomponent(s).Throughout the functional tests you must play five different keys to test the five individual voices. Alltests are performed by ear; the object generally being consistency between the voices. There will alwaysbe slight variations between the voices. Ifsound.not excessive these differences help to "warm" the Prophet'sNote that while all tests can be performed with the cabinet unopened you will have to open the cabinetto identify the individual voices since there is no reliable way of identifying them by merely listening. Tocheck a single voice, GATE its or Final VGA output can be probed, or its relative volume manipulated(see paragraph 4-22). You may also be able to use the fact that the first voice assigned after the TUNEroutine is Voice 1.IProphet trimming is a sensitive procedure which as a rule should not be done more than necessary.Prophets are carefully adjusted at the factory, where many trimmers are sealed to preventmisadjustment by vibration or accident. You willrarely be able to make an audible improvement uponthese trims— unless a malfunction has occured or a part has been replaced. If you do try to ideally set all54 trimmers when no repairs have been involved, you may succeed only in correcting for the differencebetween our DVMs or room temperature and yours.Most trims require a 4-1/2 digit DVM. An oscilloscope (preferably, dual-trace) is required for filtertuning and for serious troubleshooting.These procedures are presented in the order recommended for a Prophet assumed to be 100%electrically functional but untrimmed. Real-world problems may require you change the order of sometests and adjustments. Therefore each procedure is written to be performed independently of theothers.4-1
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PROPHET-5 SYNTHESIZERTECHNICAL MANU
Page 5 and 6: iJTable of ContentsISECTION 1MECHAN
Page 7 and 8: '1SECTION 1MECHANICAL1-0 GENERALThi
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
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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 70 and 71: 4-19 FILTER ENVELOPE AMOUNT VCA BAL
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.
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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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