Fostex CR200 Service Manual page 25

4.3.2 Multi Pulse Time Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Oscilloscope to CN3506, Pin-6 (MPLS) (STRATEGY BOARD assy)
• Disc
• Player state
• Adjustment location
[ Procedures ]
(1) Disconnect a connector CN3502 (white wires with green connector).
(2) Adjust the time from rising edge to falling edge of Waveform with 2V level.
(3) Adjust VR3501 (MPLS DLY) so that the DC voltage at CN3506 pin-6 (MPLS) becomes 70nS ± 3nS.
(4) Press the STOP key.
(5) Connect a connector CN3502.
4.3.3 EFM 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 to minimum.
(3) Press RECORD and REC MUTE keys in the order to lights up the laser diode.
(4) Adjust the time from rising edge of CN3506 pin 5 to rising edge of pin 4 of waveform
at the 2V level.
(5) Adjust VR3502 (EFM DLY) so that the delay becomes 80nS ± 3nS.
Pulse adjustment for recording (1)
The unit does not playback CD-R discs which was recorded with this player .
GND probe can be connected to CN3506, Pin-1 (DGND).
[ Settings ]: 1 V/div., 20 nS/div., DC mode
None needed
Test mode, stop
VR3501 (MPLS DLY) (STRATEGY BOARD assy)
70nS
±3nS
Pulse adjustment for recording (2)
The unit does not playback CD-R discs which was recorded with this player .
CH1 : CN3506, Pin-5 (EFM IN) (STRATEGY BOARD assy)
CH2 : CN3506, Pin-4 (SEFM) (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
VR3502 (EFM DLY) (STRATEGY BOARD assy)
2V
GND
CR200
CH1
CH2
2V
GND
80nS
±3nS
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