HHB CDR-850 Service Manual page 54

CDR-850
6.4 ADJUSTMENT 1 (LASER DIODE POWER ADJUSTMENT)
SERVO DIGITAL ASSY
CN354
1
6
R REC. PW1
VR104
RW REC.PW0
VR101
PB. PW
Fig. 4 Adjustment points
The following adjustments 1 through 3 must be done with the Input
Selector set to the AES/EBU position (LD power adjustment mode).
AES/EBU
6.4.1 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 ERASE button repeatedly until "CD" is
displayed.
(2) Press the RECORD button. The LED for confirmation of LD emission will light in green.
(3) Press the REC MUTE button. The LED for confirmation of LD emission will light in orange. 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.
54
CN102
6
VR105
RW REC.
1
PW1
VR102
VR106 Note 1 : Attach the remote sensor of the laser power meter to a point angled away
RW REC.
PW2
Note 2 : When adjusting with VR101 to VR106, first turn them completely counter-
VR103
R REC.PW2
Note 3 : Set the wavelength of laser power meter to 780 nm.
Pickup objective lens
VR101 (PB. PW)
0.60 mW ± 0.05 mW
CD-R overdrive
Playback power
Playback CD-R recording
Fig.5 Output power of the laser diode
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.
clockwise and then adjust clockwise, so that the value to be reached is not
exceeded.
DANGER – LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
CD-RW record power
CD-R record
power
CD-RW bias
power
CD-RW recording
CD-RW erase
power