CD drive: Difference between revisions

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| Communication clock to CDC
| Communication clock to CDC
|}
|}
==Adjustment pots==
To do ! Adjust values
FO - Focus Offset
*Adjusts the resting position of the focusing lens
*Compensates for mechanical variations in the optical system
*Effect: Initial laser position relative to CD surface
FG - Focus Gain
*Controls the sensitivity of the autofocus system
*Determines the speed of focus correction
*Effect: Focus responsiveness to distance variations
TB - Tracking Balance
*Adjusts the center position of the track following system
*Compensates for mechanical alignment defects
*Effect: Laser centering on the track
TG - Tracking Gain
*Controls the sensitivity of track following
*Determines the strength of lateral correction
*Effect: Track following responsiveness to track deviations
TO - Tracking Offset
*Adjusts the resting position of the tracking system
*Compensates for mechanical drift
*Effect: Initial lateral laser position


==Capacitor values==
==Capacitor values==


PCB Type NO.4 F3801AF
PCB CD Controller Type NO.4 F3801AF


{| class="regdef"
{| class="regdef"
Line 322: Line 288:
|-
|-
| C101
| C101
| SMD
| POLARISED
| 47 uF
| 47 uF
| 16V
| 16V
Line 328: Line 294:
|-
|-
| C102
| C102
| SMD
| POLARISED
| 47 uF
| 47 uF
| 16V
| 16V
Line 334: Line 300:
|-
|-
| C108
| C108
| SMD
| SMD 0805
|  
| 100 nF
|  
|  
|-
|-
|-
|-
| C109
| C109
| SMD
| SMD 0805
|  
| 100 nF
|  
|  
|-
|-
|-
|-
| C110
| C110
| SMD
| SMD 0805
|  
| 100 nF
|  
|  
|-
|-
|-
|-
| C112
| C112
| SMD
| SMD 0805
| 35 nF
| 35 nF
|  
|  
Line 370: Line 336:
|-
|-
| C116
| C116
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 376: Line 342:
|-
|-
| C117
| C117
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 382: Line 348:
|-
|-
| C118
| C118
| SMD
| SMD 0805
| 35 nF
| 35 nF
|  
|  
Line 388: Line 354:
|-
|-
| C119
| C119
| SMD
| SMD 0805
| 25 nF
| 25 nF
|  
|  
Line 400: Line 366:
|-
|-
| C125
| C125
| SMD
| SMD 0805
| 35 nF
| 35 nF
|  
|  
Line 412: Line 378:
|-
|-
| C128
| C128
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 418: Line 384:
|-
|-
| C131
| C131
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 442: Line 408:
|-
|-
| C137
| C137
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 448: Line 414:
|-
|-
| C141
| C141
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 454: Line 420:
|-
|-
| C143
| C143
| SMD
| POLARISED
| 0,47 uF
| 0,47 uF
| 50V
| 50V
Line 460: Line 426:
|-
|-
| C144
| C144
| SMD
| SMD 0805
| 1,5 nF
| 1,5 nF
|  
|  
Line 466: Line 432:
|-
|-
| C145
| C145
| SMD
| SMD 0805
| 1,5 nF
| 1,5 nF
|  
|  
Line 472: Line 438:
|-
|-
| C146
| C146
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 478: Line 444:
|-
|-
| C149
| C149
| SMD
| SMD 0805
| 60 nF
| 60 nF
|  
|  
Line 484: Line 450:
|-
|-
| C154
| C154
| SMD
| SMD 0805
| 35 nF
| 35 nF
|  
|  
Line 496: Line 462:
|-
|-
| C159
| C159
| SMD
| SMD 0805
| 60 nF
| 60 nF
|  
|  
Line 502: Line 468:
|-
|-
| C161
| C161
| SMD
| POLARISED
| 100 uF
| 100 uF
| 16V
| 16V
Line 508: Line 474:
|-
|-
| C166
| C166
| SMD
| POLARISED
| 100 uF
| 100 uF
| 16V
| 16V
Line 514: Line 480:
|-
|-
| C167
| C167
| SMD
| SMD 0805
|  
| 12 pF
|  
|  
|-
|-
|-
|-
| C168
| C168
| SMD
| SMD 0805
| 5 pF
| 4 pF
| not sure check on a functional one
|  
|-
|-
|-
|-
| C170
| C170
| SMD
| SMD 0805
| 1,5 uF
| 1 uF
| check on a fonctionnal one
|  
|-
|-
|-
|-
| C171
| C171
| SMD
| SMD 0805
| 1,5 uF
| 1 uF
| check on a fonctionnal one
|  
|-
|-
|-
|-
| C180
| C180
| SMD
| SMD 0805
| 110 pF
| 100 nF
| check on a fonctionnas one
|  
|-
|-
|-
|-
| C181
| C181
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
Line 550: Line 516:
|-
|-
| C182
| C182
| SMD
| SMD 0805
| 100 nF
| 100 nF
|  
|  
|-
|-
|}
|}
*Big thanks to Domkid for letting me borrow his Neo CD!


[[Category:Chips]]
[[Category:Chips]]
[[Category:Repairs]]
[[Category:Repairs]]
[[Category:CD systems]]
[[Category:CD systems]]

Latest revision as of 07:36, 1 November 2025

File:Cd2 cdboard1.jpg
Top-loading drive control board.

The part that makes you wait and fails in CD systems. The ones used in the NeoGeo consoles are very similar to those found in the Sega CD. They're basically enhanced audio CD drives, which are also able to read CD-ROM data tracks.

Made of a control board and an optical pickup.

The NeoGeo CD top-loading model drive was made by Sony. The CDZ one was made by Sharp ?

The control board has:

  • A 4-bit mask ROM MCU (Sony CXP5084), taking care of operation sequencing and communication with the NeoGeo.
  • A DSP (Sony CXD2500) to process analog data from the pickup.
  • A servo controler (Sony CXA1372) to drive the pickup coils for tracking and focus.
  • A spindle, sled (and tray) motor driver.

Connections

Some say the protocol was standard for the time, but clear information is hard to find. This was guessed from the system ROM disassembly, Sega CD documents and a logic analyzer.

Top-loading model

Connector pinout, directions are from CDD (CD Drive) to CDC (CD Controller):

Pin # Name Type Direction Description
1 CDCK Clock Output Communication clock to CDC
2 ? ? ? High ?
3 /IRQ Signal Output Asks the CDC for a data exchange (low pulse at ~64Hz)
4 ? ? ? High ?
5 HOCK Clock Input Communication clock from CDC
6 D0~3 Data Both 4-bit command/status data bus
7
8
9
10 ? ? ? ?
11 BCLK? Clock Output Serial bit clock, should be 44100 * 32 = 1.4112MHz
12 SDATA Data Output Serial data
13 LRCK Signal Output I2S word clock, should be 44100Hz. Audio L/R switch for the DAC.
14 D/M ? Signal Output Data/Music. Low during music playback ?
15 GND Power - Ground
16 5V Power - +5V for logic
17 9V Power - +9V for motors and coils
18 GND Power - Ground

Missing: /RESET, C2PO, and 16MHz.

Front-loading model

Connector pinout, directions are from CDD (CD Drive) to CDC (CD Controller):

Pin # Name Type Direction Description
1 SGND Power - Ground
2 SVCC Power -
3 VCC Power -
4 WFCK Clock Output Write Frame Clock
5 GND Power - Ground
6 SCOR Pulse Output Subcode sync
7 MUTE ?
8 SBSO Data Output Subcode data
9 EXCK Clock Input Subcode clock
10 EMP ? ? EMPty ?
11 DOUT Data Output ?
12 6MHz Clock ? ?
13 LRCK Clock Output DATA L or R channel (44100Hz)
14 DATA Data ? Data stream
15 BCLK Clock Output DATA bit clock (44100 * 24 * 2 = 2.12MHz)
16 C2PO Data Output Error flag
17 DB0~3 Data Both 4-bit command/status data bus
18
19
20
21 HOCK Clock Input Communication clock from CDC
22 RESET Pulse Input The name says it all
23 /IRQ Signal Output Asks the CDC for a data exchange
24 L-MUTE ?
25 CDCK Clock Output Communication clock to CDC

Capacitor values

PCB CD Controller Type NO.4 F3801AF

Capa # Type Value Voltage
C101 POLARISED 47 uF 16V
C102 POLARISED 47 uF 16V
C108 SMD 0805 100 nF
C109 SMD 0805 100 nF
C110 SMD 0805 100 nF
C112 SMD 0805 35 nF
C113 POLARISED 330 uF 16V
C114 POLARISED 100 uF 16V
C116 SMD 0805 100 nF
C117 SMD 0805 100 nF
C118 SMD 0805 35 nF
C119 SMD 0805 25 nF
C124 POLARISED 100 uF 16V
C125 SMD 0805 35 nF
C127 POLARISED 4,7 uF 16V
C128 SMD 0805 100 nF
C131 SMD 0805 100 nF
C132 POLARISED 1 uF 50V
C133 POLARISED 47 uF 16V
C134 POLARISED 33 uF 25V
C137 SMD 0805 100 nF
C141 SMD 0805 100 nF
C143 POLARISED 0,47 uF 50V
C144 SMD 0805 1,5 nF
C145 SMD 0805 1,5 nF
C146 SMD 0805 100 nF
C149 SMD 0805 60 nF
C154 SMD 0805 35 nF
C155 POLARISED 100 uF 16V
C159 SMD 0805 60 nF
C161 POLARISED 100 uF 16V
C166 POLARISED 100 uF 16V
C167 SMD 0805 12 pF
C168 SMD 0805 4 pF
C170 SMD 0805 1 uF
C171 SMD 0805 1 uF
C180 SMD 0805 100 nF
C181 SMD 0805 100 nF
C182 SMD 0805 100 nF
  • Big thanks to Domkid for letting me borrow his Neo CD!
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