Fostex CR200 Service Manual page 26

CR200
4.3.4 3T Rising Edge Time Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Oscilloscope to
• Disc
• Player state
• Adjustment location
[ Procedures ]
(1) Disconnect a connector CN3502.
(2) Turn VR104 (REC. PW) fully counterclockwise to reduce the power at minimum.
(3) Press the RECORD and the REC MUTE keys in the order to lights up the laser
diode.
(4) Adjust the time from rising edge of CN3506 pin-3 to rising edge of pin 2 of waveform
with 2V level.
(5) Adjust VR3503 (3T DLY) so that the delay becomes 42nS ± 3nS.
(6) Connect a connector CN3502.
4.3.5 WBL+ Offset Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Oscilloscope to CN104, Pin-6 (RWBL) (HEAD BOARD assy)
• Disc
• Player state
• Adjustment location
[ Procedures ]
(1) Turn VR108 (WBL. OFS) to fully counterclockwise.
(2) Adjust VR107 (WBL+. OFS) so that the DC voltage at CN104 (TP1), Pin-6 (RWBL) is Ð20mV ± 10mV.
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Pulse adjustment for recording (3)
The unit does not playback CD-R discs which was recorded with this player .
CH1 : CN3506, Pin-3 (3T IN) (STRATEGY BOARD assy)
CH2 : CN3506, Pin-2 (3T OUT) (STRATEGY BOARD assy)
GND probe can be connected to CN3506, Pin-1 (DGND).
[ Settings ]
CH1 : 1 V/div., DC mode, 20 nS/div.
CH2 : 1 V/div., DC mode
None needed
Test mode, recording power ON
VR3503 (3T DLY) (STRATEGY BOARD assy)
To adjust the gain balance of the wobble signal.
The unit does not record or playback CD-R discs.
GND probe can be connected to CN104, Pin-4 (AGND).
[ Settings ]: 1 mV/div., 5 mS/div., DC mode
None needed
Test mode, stop
VR107 (WBL+. OFS) (HEAD BOARD assy)
CH1
CH2
2V
GND
42nS
±3nS