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) <imgur w=240>obJYJOG.jpeg</imgur>
  • 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 (SCPH-10000, SCPH-15000)
  • <imgur w=240>KnNqiXM.jpeg</imgur><imgur w=240>FHGfvMM.jpeg</imgur><imgur w=240>YXgnrZs.jpeg</imgur><imgur w=240>7CTF3pm.jpeg</imgur>
  • The only drive block to use the KHS-400A pickup
  • In these pictures, the flat flex cable between the board and the laser unit has been replaced. The only difference to the original cable is the length of the blue flap, which is longer on the original cable on the side connected to the PCB
• B/B' chassis drive block (north american early SCPH-30001)
  • 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 (later north american SCPH-30001, SCPH-30000 many regions)
  • 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 (SCPH-18000)
  • 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 (later SCPH-30000 any region, early SCPH-30000R many regions, SCPH-35000 some regions, SCPH-35000R some regions)
  • all drive electronics moved to the motherboard, no dedicated drive board
• F/G chassis drive block (late japanese SCPH-30000, late SCPH-30000R many regions, japanese SCPH-37000, SCPH-39000 many regions)
  • Optical pickup changed to KHS-400C, KHS-400R or SF-HD7
• H/I chassis drive block (SCPH-50000 series, any region)
  • 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 (late SCPH-50000 series)
  • 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)