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.
Thanks for the info. VA11 boards are relatively rare by the way. They had some problem and had to put extra trap boards in them, then they quickly shifted production to VA13s which had those built-in.
