Pioneer XR-MR7 Service Manual page 86

XR-MR7
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6.4 ADJUSTMENT 1 (LASER DIODE POWER ADJUSTMENT)
7 List of Adjustment
(1) : 6.4.1 Playback Power Adjustment
(2) : 6.4.2 CD-R Pecord Power Adjustment
(2) : 6.4.3 CD-RW Pecord Power Adjustment
Note : (1) – (3) " ANA " Segment lights this time
CD-R CORE ASSY
TE
L 13942296513
VR164
RW ERASE
Fig. 4 Adjustment points
6.4.1 Playback Power Adjustment
Test Point Pickup objective lens
VR101 (PB. PW)
Adjustment Point
0.60 mW ± 0.05 mW
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.
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(2) Press the "RECORD" button.
(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.
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(5) Press the "STOP" button to shut off the LD.
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ANA
CN102
6
1
1 : RF
2 : VC
3 : MPP
4 : TE
5 : VC
6 : FE
VR141
VR163
RW BIAS R REC.PW1
VR161 VR162 VR101
RW REC R O.D. PB. PW
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CD-R overdrive
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.
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Note 2 : When adjusting with VRs, first turn them completely
counter-clockwise and then adjust clockwise, so that the
value to be reached is not exceeded.
Note 3 : The wave length setting of the lasser power meter is
assumed to be 780 nm.
DANGER – LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
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CD-RW record power
CD-R record
power
CD-RW bias
power
CD-RW recording
CD-RW erase
power
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