- 1 Chip Info
- 2 CD Test Points & Adjustments
- 3 Capacitor List
- 4 Schematics
- 5 Service Manuals & Bulletins
ENR-005 (Main PCB)
- IC101: CPU (Sega CD): MC68000FN12
- IC102: SRAM: LC3564QM
- IC103: Power-on Reset: PST600D
- IC104: BIOS ROM: TC531024F-12
- IC105: DRAM 4Mb: MN414270SJ-80
- IC110: +5V Regulator: PQ05RF1
- IC131: 315-5476A
- IC132: SRAM: TC51864FL-10
- IC133: 74HC21A
- IC141: 315-5632
- IC142, IC143: DRAM: TC511664BJ-80
- IC161: CD Error Correction LSI: LC89513
- IC171: CPU: MC68000FN8
- IC172: SRAM 512Kb: LC331632M-12
- IC181: NEC D9036GB
- IC182: Z80 SRAM: BR6265AF-10LL
- IC191: 315-5660
- IC192: VRAM: M54C864-80
- IC601: CD Digital Signal Processor: CXD2500BQ
- IC631: DAC: MN35501
- IC632: OpAmp: 15218 (Rohm BA15218)
- IC651: OpAmp: 15218 (Rohm BA15218)
- IC661: Audio Filter: 5841AS
- IC691: Microcontroller: HD404019RFS
ENR-006 (CDROM PCB)
- IC501: CD RF Amplifier: CXA1571M
- IC502: CD RF Signal Processor: CXA1372Q
- IC503: BTL Driver for CD: BA6393FP
- IC851: OpAmp: 5218A
- IC901: OpAmp: 5218A
CD Test Points & Adjustments
All connections at TP501 on CDROM PCB
- 1 RF
- 2 FE (Focus Error)
- 3 FEIN (Focus Error IN)
- 4 TE (Tracking Error)
- 5 TEIN (Tracking Error IN)
- 6 TEST
- 7 GND
- 8 VC
- 9 GND via lid switch with pull-up resistor to VCC. Should read 0v when closed, 5v when open.
- R508 Focus Bias
- R510 E/F Balance
- R522 Focus Gain
- R524 Tracking Gain
CD Adjustment Procedures
From the Service Manual
Before the adjustment The initial screen ( that is a comment "Put a disc on the turntable" ) is displayed when the power supply is turned on without a disc.
The screen shifts to the control screen after reading a disc if a disc is set and the door close detection switch is pressed. The disc keeps rotating for approximately 1 minute after shifting to the control screen. Press the playback and then the stop button if you want to stop the rotation. With a disc on the turntable, the screen shifts to the control screen quickly after reading a TOC when the power supply is turned on. (The initial screen is displayed while TOC is being read.)
Adjustment measure Oscilloscope, Test disc (CRG-1117)
FE (focus error) bias (CD stop mode)
- Connect an oscilloscope between TP501 pin 2 (FE) and TP501 pin 9 (GND).
- Adjust R508 so that the DC voltage of the focus error signal becomes 0v, +/-10mV. (note this correction -vs- the service manual)
- Connect TP501 pin 6 (TEST) with TP501 pin 7 (GND).
- Connect a oscilloscope between TP501 pin 4 (TE) and TP501 pin 8 (VC) and play the test disc.
- Adjust R510 so that the center voltage of the waveform becomes 0±0.05V.
Focus/Tracking Gain Symptoms
If the gain is out of adjustment, the symptoms below will appear.
- Gain too low
- Focus gain: Focus is not obtained and disc does not rotate.
- Tracking gain: Mechanical shock occurs easily and sound is interrupted. Or time counter display stops counting.
- Gain too high
- Focus gain: Scratches (on the disc) easily interrupt play, and noise is increased during play.
- Tracking gain: Since the follow-up ability of the pickup is too high, the pickup may oscillate and oscillating sound may output. (Roughly translated - the laser eye will sing/squeal/ring)
As described above, the focus and tracking gain adjustment are performed to satisfy mutually contradictory characteristics.
A simplified adjustment procedure is described below. However, since exact adjustment can not be performed prior to adjustments, note (or mark) the positions of the semi-fixed resistors.
If the positions after the adjustment are only different, return the VRs to their original position.
(Translation: Measure the resistance of each adjustment before tweaking them)
Focus/Tracking Gain Adjustments
- Focus gain adjustment
- Connect an oscilloscope to TP501 pin 2 (FE) and TP501 pin 8 (VC).
- Load the test disc and press the PLAY button.
- Adjust R522 (F.GAIN ADJ.) so that the correct waveform as shown in figure 1 is obtain.
- Tracking gain adjustment
- Connect an oscilloscope to TP501 pin 4 (TE) and TP501 pin 8 (VC).
- Load the test disc and press the PLAY button.
- Adjust R524 (T.GAIN ADJ.) so that the correct waveform as shown in figure 2 is obtain.
ENR-005 EMW10420-002, -003
C103 10uF 25v C113 47uF 16v C114 100uF 6.3v C115 47uF 16v C116 EMPTY C117 4.7uF 50v -002 C117 22uF 16v -003 C118 22uF 16v -002 C118 Not present on -003 C132 10uF 25v C143 10uF 25v C159 10uF 25v C163 10uF 25v C171 10uF 25v C206 10uF 25v C223 100uF 6.3v C230 220uF 6.3v C234 10uF 25v C237 EMPTY C239 EMPTY C245 10uF 25v C246 10uF 25v C248 10uF 25v C252 10uF 25v C263 1uF 50v C264 1uF 50v C635 22uF 16v -002 C635 100uF 6.3v -003 C636 22uF 16v -002 C636 Not present on -003 C647 10uF 25v C648 10uF 25v C649 Not present on -002 C649 100uF 6.3v C657 10uF 25v C658 10uF 25v C660 47uF 10v C711 22uF 16v C712 22uF 16v C713 10uF 16v C714 10uF 25v C728 22uF 16v C729 10uF 25v C730 10uF 25v C781 47uF 16v
C501 47uF 10v C507 47uF 10v C508 100uF 6.3v C510 1uF 50v C543 10uF 25v C546 10uF 25v C548 47uF 10v C551 220uF 16v C814 47uF 10v C855 10uF 25v C857 1uF 50v C858 4.7uF 50v C859 4.7uF 50v C886 10uF 25v C888 22uF 16v C903 100uF 6.3v C904 100uF 6.3v