CDVD Drive

Overview

The drive is known as MD-block in internal Sony documentation.

Electronics

• DSP
• MechaCon
• Drivers
• RF-Amp

Early consoles (A, A+, AB, B, B', C, C' chassis) have separate boards with some of the disc drive electronics:

• GM-038 (A-chassis)
  • Contains RF-amp (CXA2605R)
• GM-041 (B-chassis, B'-chassis)
  • Contains RF-amp (SP3727A) and tilt-driver (BA5912AFP)
• TODO: Board of AB chassis
  • Contains RF-amp (TODO: which RF-amp?)
• GM-043 (C-chassis, C'-chassis)
  • Contains RF-amp (SP3727A), spindle driver (BA6664FM) and focus/tracking/sled-motor/tray-motor driver (BA5810FP)

The PSX also has a dedicated board for drive electronics, which contains all drive components for the PSX/DVR-mode/burning part of the PSX's unique dual-laser drive. Electronics for the PS2-part of the drive are however on the mainboard (spindle motor control and driving are always handled by the PSX/DVR part of the drive).

• MA-S38 (DESR-x000, DESR-x100)
• MA-S43 (DESR-x500, DESR-x700)

Mechanics

Fat drive assemblies

• A/A+ chassis drive block
  • The only drive block to use the KHS-400A pickup
• B/B' chassis drive block
  • Uses a radial tilt control motor only found in this drive block; all other drive blocks have their radial tilt permanently set at the factory
  • Optical pickup changed to KHS-400B
• C/C' chassis drive block
  • Takes away the tilt motor introduced on the B/B' chassis drive block
  • Has both driver ICs on the drive board
• AB chassis drive block
  • Basically a C/C' chassis drive block with a different drive board that only contains the RF-amp but not the driver ICs, since these are located on the motherboard
• D/D' chassis drive block
  • all drive electronics moved to the motherboard, no dedicated drive board
• F/G chassis drive block
  • Optical pickup changed to KHS-400C, KHS-400R or SF-HD7
• H/I chassis drive block
  • Mechanical changes:
    • Tilt of the two rods that the optical pickup slides on can be adjusted individually
    • Slide arm of the optical pickup now made of a metal spring instead of plastic
• J chassis drive block
  • Very different drive:
    • Uses Mitsumi TDP062W drive mechanism based around the Mitsumi PVR-702W laser

Slim drive assemblies (work in progress)

• Some of the slim drives exist with different cable lengths for different chassis. K-chassis and L-chassis use same cable length between each other, as do P-chassis and R-chassis between each other. M-chassis and N-chassis both use different cable lenghts. This makes a total of 4 slim PS2 drive "types" regarding cable length.

• KHM-430AAA (with K-chassis/L-chassis compatible cable length)
  • K-chassis, L-chassis
  • KHM-430 pickup

• KHM-430BAA (with M-chassis compatible cable length)
  • M-chassis
  • KHM-430C pickup

• TDP182W (with M-chassis compatible cable length)
  • M-chassis
  • PVR-802W pickup

• TDP182W (with N-chassis compatible cable length)
  • N-chassis
  • PVR-802W pickup

• KHM-430CAA (with P-chassis/R-chassis compatible cable length)
  • P-chassis, R-chassis
  • KHM-430C pickup

PSX drive assemblies

The PS2-part of the drive is based on the H/I chassis SCPH-5XXXX fat PS2 drive, both electrically and mechanically. The whole drive assembly is connected to the motherboard using 3 flat flex cables: One is an IDE connection to the dedicated drive board of the PSX-part, one provides power (5V, 12V, GND) and also connects the PS2-part sled motor to the motherboard (since it is controlled by the motherboard directly), and one connects the KHS-400C PS2-part pickup to the motherboard, since it is also directly controlled by the motherboard. The spindle motor is always controlled by the dedicated PSX-part drive electronics over IDE, even in PS2 mode.

• DESR-x000 and DESR-x100 drive
  • Uses Sony KWS-200A optical pickup

<imgur w=240>8UIuNSN.jpg</imgur>

• DESR-x500 and DESR-x700 drive
  • Uses Sanyo SF-DB11 optical pickup

<imgur w=240>XkMxA6G.jpg</imgur>

Optical pickup

Notes

• KHS-400R seems to be a rebadged Sanyo SF-HD7 with a different plastic cap to remove the "HD7" labelling present on the SF-HD7; they are completely drop-in interchangeable
• KHS-400B and KHS-400C are electrically compatible, but differ in thickness of their bases, making them mechanically incompatible (putting a KHS-400C in place of a KHS-400B will seem to work at first, but the flex cable will bend heavily once the pickup reaches the outer area while moving)
• KHS-400C and KHS-400R / SF-HD7 are mechanically fully compatible, but require different calibration data for MechaCon
• There are 2 different lens assemblies for KHS-400B, which require different calibration data for MechaCon: T487 (white ring around lens) and T609K (yellow ring around lens). T609K seemingly was introduced with the D/D'-chassis. Some early T609K have a white ring around the lens. These pickups have a violet marking at the adjustment screw. (Markings in other colors don't indicate any lens assembly variant, only violet does)
• KHS-400B (with T487 lens assembly) can fully drop-in replace KHS-400A, but not vice versa (mechanical reasons: KHS-400A in a drive meant for KHS-400B can't press the home-position switch near the spindle). KHS-400B with T609K lens assembly can also be used, but requires different calibration data for MechaCon.
• PSX consoles always have 2 pickups: One KHS-400C (for PS2 games only) and KWS-200A (XPD-001 motherboard) or SF-DB11 (XPD-005 motherboard). Every disc will first be detected by the KWS-200A / SF-DB11, so if this pickup is broken, the console also won't read PS2 games, since the KHS-400C only becomes active once a PS2 game has been detected
• The drive mechanisms of earlier and later PSX consoles are completely different from each other (except the KHS-400C), so you can't replace a KWS-200A with a SF-DB11 or vice versa
• PVR-802W and KHM-430 seem to be mostly identical; KHM-430 is probably a rebadged PVR-802W, as it is with KHS-400R / SF-HD7

Pickup types

Sony

• KHS-400A (A-chassis, A+-chassis) <imgur w=240>SLwBUGn.jpg</imgur> <imgur w=240>vzMYOTs.jpg</imgur>
• KHS-400B (AB-chassis, B/B'-chassis, C/C'-chassis, D/D'-chassis)
  • with T487 lens assembly
  • with T609K lens assembly
• KHS-400C (F-chassis, G-chassis, H-chassis, I-chassis, PS2-mode laser in all PSX consoles)
• KHS-400R (F-chassis, G-chassis, H-chassis, I-chassis)
• KWS-200A (DVR/DVD-burning laser in earlier PSX consoles)
• KHM-430 (some slim consoles)
• KHM-430C (some slim consoles)

Sanyo

• SF-HD7 (F-chassis, G-chassis, H-chassis, I-chassis)
• SF-DB11 (DVR/DVD-burning laser in later PSX consoles)
• Oddly enough, the I-chassis service manual also mentions Sanyo SF-HD8, SF-HD9 and SF-HD10, which seem to be very different from SF-HD7 in construction. Never seen in any consumer PS2 console.

Mitsumi

• PVR-702W (J-chassis)
• PVR-802W (download datasheet) (some slim consoles)

Sankyo

• SPU-3170 (some slim consoles)

Third party replacements/clones

• KHS-400H / PS-400H (replaces KHS-400R / SF-HD7)
• KHS-400Q / PS-400Q (replaces KHS-400C)
• KHS-400W (replaces KHS-400C)