Fostex CR200 Service Manual page 34

CR200
4.3.18 WBL Focus 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)
Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD or REV keys.
(2)
Press the FINALIZE key, the PLAY key and the PAUSE key in the order to close the respective servos and put the
CR200 into play mode.
(3) Press the AUTO/MANUAL key to light up the COPY BIT LED.
(4) Adjust VR115 (WFE. OFS) so that the amplitude of waveform at CN104, Pin-5 (WBL) is minimum.
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To adjust the gain balance of the wobble signal.
The unit does not record, search or pause CD-R discs.
[ This connection must be via high-pass filter (180pF+3.9k½).]
GND probe can be connected to CN104, Pin-4 (AGND).
[ Settings ]: 5 mV/div., 20 mS/div., DC mode
STD-R03
Test mode, play
VR115 (WFE. OFS) (HEAD BOARD assy)
Out of adjustment Optimum adjustment
Fig. 22