I was thinking it might be worthwhile to collect all the information we have in a single place. I'll start with a corrected version of the data for the EXL-P608 drive I posted earlier. Main board: '171-7288B PC BD SATURN MAIN VA11", "837-12648-01 IC BD SATURN MAIN VA11 JPN" Drive: ""610-6294-20 ASSY CD UNIT SAT JVC EXL-P608" Drive PCB: "HQ100002-002", "HQA-001A" CN101: Connected to optical pickup presumably common for all Optima-6 based drives. 1: Pickup 'A'. Connects to AN8809 RF Amp pin 36. 2: Pickup 'B'. Connects to AN8809 RF Amp pin 35. 3: Pickup 'F'. Connects to AN8809 RF Amp pin 34. 4: Pickup 'C'. Commoned with 'A' 5: Pickup 'D'. Commoned with 'B' 6: Photodiode common. Connected to VCC on drive board 7: Pickup 'E'. Connects to AN8809 RF Amp pin 33. 8: Monitor diode. Connects to AN8809 RF Amp pin 1. 9: Laser diode drive. Driven (via transistor ampliifer) from AN8809 RF Amp chip pin 2. 10: Bottom end of laser adjust pot. Connected to ground on drive board via fixed R. 11: Laser/monitor diode + chassis ground. Connected to ground on drive board. 12: Focus actuator +VE. Connected to M56754SP BTL driver pin 11. 13: Tracking actuator +VE. Connected to M56754SP BTL driver pin 7. 14: Tracking actuator -VE. Connected to M56754SP BTL driver pin 6. 15: Focus actuator -VE. Connected to M56754SP BTL driver pin 12. CN102: Host interface 1: 33MHz clock - sourced from Saturn, drives pin 58 on MM662724 DSP chip via coupling cap. 2: GND 3: Drive status info. Pin 3 of CDM301V sub-cpu 4: Drive commands. Pin 4 of CDM301V sub-cpu 5: Command / status byte sync line. Pulses for each byte. Pin 1 of CDM301V sub-CPU. 6: Command / status frame signal - locked to CD frame rate in playback, 60Hz in idle. Pin 5 of CDM301V 7: Command / status clock. Bit clock for both command and status. Pin 2 of CDM301V sub-CPU 8: GND - on JVC drives. Used by main board to select frequency on pin 1 (GND=33MHz, open=16MHz) 9: BCLK - commoned with pin 14 10: BLKCLK from DSP pin 13 - pulses high at the start of each subcode block (I.E. 75Hz in x1 mode) 11: /RESET from Saturn - wired to sub-CPU pin 18. 12: GND 13: LRCLK - From pin 2 of DSP. Standard I2S signal. 14: BCLK - From pin 1 of DSP. Standard I2S signal (commoned to 9) 15: DATA - From pin 3 of DSP (used for both CD-ROM and digital audio) 16: GND 17: /CD-ROM signal, high with audio. From pin 25 of sub-CPU 18: SUBC from DSP pin 55. Just described as "subcode out" 19: SBCK from DSP pin 56. Clock for 19. 20: IPFLG from DSP pin 64. Pulses high on C2 error. 21: /CLDCLK from DSP pin 62. Subcode frame clock (clock for IPFLG) CN103: Drive power 1: +5V for output stages of BTL driver - wired to pins 29 and 30 of the BTL chip 2: Gnd for 1 - wired to BTL driver ground pins 3: Gnd for rest of board 4: +5V for rest of board - also runs logic supply on BTL chip. 5: Door sw - low when drive door closed. Pulled up on drive PCB, wires to pin 30 on sub-CPU. If anyone else can cross check-this, that would be good.
