Sequential Circuits Prophet-5 Service Manual - Audiofanzine

iJTable of ContentsISECTION 1MECHANICAL1-0 GENERAL 1-11-1 PRECAUTIONS 1-11-2 SERVICE POSITION 1-11-3 PCB 4 VOICE BOARD 1-31-4 PCB 3 COMPUTER BOARD 1-41-5 PCB 1/2 CONTROL PANELS 1-51-6 KEYBOARD 1-6SECTION 2THEORY2-0 GENERAL 2-12-1 SYNTHESIZER BACKGROUND 2-12-2 THE PROPHET 2-42-3 ANALOG SYNTHESIZER DESCRIPTION 2-72-4 OSCILLATOR A, B AND LFO 2-82-5 MIXER AND AMOUNT VCAS 2-92-6 FILTER 2-92-7 ENVELOPE GENERATORS 2-92-8 AUDIO OUTPUT 2-102-9 MICROCOMPUTER SYSTEM DESCRIPTION 2-102-10 MICROPROCESSOR, MEMORY, AND I/O INTERFACE 2-122-11 CONTROL MATRICES 2-152-12 ADC, DAC, AND CV OUTPUTS 2-162-13 TUNE AND A-440 2-192-14 SEQUENCER INTERFACE 2-202-15 CASSETTE INTERFACE 2-21SECTIONSDOCUMENTS3-0 DOCUMENT LIST 3-13-1 DOCUMENT NOTES 3-1SECTION 4SERVICE4-0 GENERAL 4-14-1 OSCILLATOR A TEST 4-34-2 OSCILLATOR B TEST 4-44-3 MIXER AND NOISE TEST 4-54-4 UNISON AND GLIDE TEST 4-54-5 FILTER TEST 4-64-6 AMPLIFIER TEST 4-64-7 LFO AND WHEEL-MOD TEST 4-74-8 POLY-MOD TEST 4-84-9 FINAL TEST 4-94-10 POWER SUPPLY TRIM 4-104-11 PITCH WHEEL TRIM 4-104-12 MASTER SUMMER OFFSET TRIM 4-104-13 WHEEL-MOD LFO VGA BALANCE 4-104-14 DAC GAIN, ADC GAIN, SEQ INTERFACE TRIM 4-114-15 WHEEL-MOD NOISE VGA BALANCE 4-114-16 VCO SCALE TRIM 4-124-17 POLY-MOD FILTER ENVELOPE VGA BALANCE 4-134-18 POLY-MOD OSCILLATOR B VGA BALANCE 4-134-19 FILTER ENVELOPE AMOUNT VGA BALANCE 4-144-20 FILTER TUNING 4-144-21 FINAL VCA BALANCE 4-164-22 VOICE VOLUME 4-16