Fostex CR200 Service Manual page 27

4.3.6 Coarse WBL Offset Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Oscilloscope to CN104, Pin-5 (WBL) (HEAD BOARD assy)
• Disc
• Player state
• Adjustment location
[ Procedures ]
(1) Adjust VR108 (WBL. OFS) so that the DC voltage at Pin 5 (WBL) of CN104 (TP1) becomes 0 ± 10mV.
4.3.7 RF Offset Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARD assy)
• Disc
• Player state
• Adjustment location
[ Procedures ]
(1) Adjust VR121 (RF. OFS) so that the DC voltage at Pin 1 (RF) of CN204 (TP201) becomes 0 ± 10mV.
4.3.8 Playback Power Re-adjustment
[ Procedures ]
(1) Adjust in the same manner as "4.2.1. Playback Power Adjustment " in Adjustment 1.
To optimize the DC offset voltage of the wobble amp.
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
VR108 (WBL. OFS) (HEAD BOARD assy)
To optimize the DC offset voltage of the RF amp.
The unit does not playback..
GND probe can be connected to CN204, Pin-4 (AGND).
[ Settings ]: 1 mV/div., 5 mS/div., DC mode
None needed
Test mode, stop
VR121 (RF. OFS) (HEAD BOARD assy)
CR200
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