Fostex CR300 Service Manual page 14

CR300
3-3-3. How to Playback a Disc in Test Mode
In the Test Mode, since each servo circuit operates independently, playing back a disc
requires that your operate the keys in the correct order to close the servo circuits.
Here is the key operation sequence for playing back a disc in the Test Mode.
Wait at least 2 ~ 3 seconds between each of these operations.
3-4. ADJUSTMENT 1 (LASER DIODE POWER ADJUSTMENT)
SERVO DIGITAL ASSY
CN354
6
VR104
RW REC.PW0
Fig. 4 Adjustment points
3-4-1. Playback Power Adjustment
Test Point
Adjustment Point
Adjustment Value
[Procedure]
(1) Check that "CD" is displayed on the FL display. If "CD-R" or "CD-RW" is displayed, press the STOP button repeatedly
until "CD" is displayed.
(2) Press the RECORD button. The LED for confirmation of LD emission will light in orange.
(3) Press the REC MUTE button. The LED for confirmation of LD emission will light in red. The LD is emitting in this
status.
(4) Turn VR101 clockwise until the adjustment value to be reached is obtained.
(5) Press the STOP button to shut off the LD.
14
1
CN102
1
VR105
RW REC.
6
PW1
VR102
R REC. PW1
VR106
RW REC.
PW2
VR101
VR103
PB. PW
R REC.PW2
DANGER - LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
Pickup objective lens
VR101 (PB. PW)
0.60 mW ± 0.05 mW
Playback power
Playback CD-R recording
Fig.5 Output power of the laser diode
Note 1: Attach the remote sensor of the laser power meter to a point angled away
about 10 degrees against the pickup lens and where the maximum power
is detected, so that there will be no light reflected onto the pickup.
Note 2: When adjusting with VR101 to VR106, first turn them completely counter-
clockwise and then adjust clockwise, so that the value to be reached is not
exceeded.
Note 3: Set the wavelength of laser power meter to 780 nm.
Note 4: The following adjustments 1 through 3 must be
done with the Input Selector set to the Analog position
(LD power adjustment mode).
FINALIZE
CD-RW record power
CD-R overdrive
CD-R record
power
CD-RW recording
CD-RW erase
power
INPUT SELECTOR
DIGIT AL
COAX
OPT •
AES / •
EBU
CD-RW bias
power
ANALOG
XLR / +4
•
XLR / -10
•
•
• LINE