Fostex CR200 Service Manual page 35

4.3.19 Recording Power Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Multimeter to CN104, Pin-7 (PWAJT) (HEAD BOARD assy)
• Disc
• Player state
• Adjustment location
CAUTION:
(a) Perform this adjustment more than 5 minutes after starting up the test mode.
(b) Power more than ten times greater than playback power is released during these adjustment. Never look directly at the
objective lens.
(c) This adjustment cannot be performed accurately if disc is inserted. Be sure to remove disc first before adjustments.
(d) The laser diode may be damaged if the recording power is greater than the specified value. Always perform the step 1
below before making adjustments and be careful not to exceed the adjustment value by more than 50mV from the
specified value in the step 3 below).
[ Procedures ]
When Adjusting with the multimeter
•
(1) Fully turn VR104 (REC. PW) counterclockwise to reduce the power to the minimum.
(2) Press RECORD and REC MUTE keys in this order to lights up the laser diode.
(3)
Adjust the voltage value of Pin 7 (PWAJT) of CN104 to the voltage value (REC. PW voltage 10mV) displayed on the
pickup flexible cable using VR104 (REC. PW).
Reference: When adjusting with optical power meter
•
CAUTION:
(a)
Perform this adjustment more than two minutes after starting up the test mode (after inserting the AC plug).
(b)
The laser diode may be damaged if the recording power is greater than the specified value. Always perform step 1 before
making adjustments and be careful not to exceed the adjustment value by more than 0.3mW (specified value in step 3).
(c)
Power more than ten times greater than playback power is released during this adjustment. Never look directly at the
objective lens.
DANGER - LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
To optimize the recording power of the laser diode.
The unit does not either record or playback self-recorded discs. It also skips
tracks and the RF waveform is dirty. (No problem shown during CD playback)
GND probe can be connected to CN104, Pin-4 (AGND).
None needed
Test mode, maximum recording power ON
VR104 (REC. PW) (HEAD BOARD assy)
CR200
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