Fostex CR200 Service Manual page 36

CR200
[ Procedures ]
Fully turn VR104 (REC. PW) counterclockwise to reduce the power to the minimum.
(1)
Move the pickup to the outer edge of the disc with the MANUAL / TRACK SEARCH FWD key.
(2)
Press RECORD and REC MUTE keys in that order to lights up the laser diode.
(3)
Shine the light discharged from the objective lens in the pickup on the light power meter sensor and adjust VR104 (REC.
(4)
PW) so that the recording laser diode output is an average of 4.7mW ± 0.1mW (Wavelength 790nm, Average mode).
4.3.20 HF Amp. Gain Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Oscilloscope to CN104, Pin 8 (HF) (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 player
into play mode.
(3)
Line up bright line (ground) at the center of the oscilloscope screen and put the oscilloscope into DC mode.
(4)
Adjust VR119 (HF. GAIN) so that the amplitude of waveform at CN104 , Pin-8 (HF) is 2.0V ± 0.1V.
NOTE :
Adjust after checking that the COPY BIT LED is OFF.
36
To correct the discrepancy in the HF level with the pickup.
The unit does not record, track search is impossible.
GND probe can be connected to CN104, Pin-4 (AGND).
[ Settings ]: 50 mV/div., 500 nS/div., DC mode
TCD-785
Test mode, play
VR119 (HF. GAIN) (HEAD BOARD assy)
Fig. 23
P : Playback Power
R : Recording Power
2.0V 0.1V