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DW - S114X
4. Recording Power Adjustment
@ Objective
To optimize the recording power of the laser diode.
@ Symptom when out of
|The player does not record nor playback self-recorded discs. It also skips tracks and the RF
adjustment
waveform is dirty. (No problems during CD playback)
@Measurementinstru-
| Shine the light discharged from | @ Player state
Spindle rotation frequency : Fourfold
ment connections
the objective lens on the light
speed, max power ON entry, max
power meter sensor.
power ON
[Settings]
@ Adjustment location
|WR104 (REC. PW)
Wavelength 790 nm
Average mode
@ Disc
None needed
[Procedure]
1. Fully turn VR104 (REC.PW) counterclockwise to reduce the power to the minimum.
2. Open the disc tray.
3. Short-circuit the pins | and 2 of TP connector CN1026(TP205). (Refer to fig. 1.)
4. Move the pickup to the position where shineable the light discharged from the objective lens on the light power meter
sensor.
5. Spindle rotation frequency : Fourfold speed, max power ON entry and max power ON to lights up the laser diode.
6. Shine the light discharged from the objective lens in the pickup on the light power meter sensor and adjust VRI04
(REC.PW) so that the playback laser diode output is an average of 10 mW + 0.05 mW.
7. Turn off the all servos, and release the short-circuit of TP connector CN1026(TP205).
Notes
« Power more than ten times greater than playback power is released during these adjustments.
Never look directly at the objective lens.
« The laser diode may be damaged if the recording power is greater than the specified value.
Always perform step | before making adjustments.
* Do not open the disc tray after the TP connector CN1026(TP205) is short-circuited. The clamp motor will be locked.
Be sure to perform the adjustment from step 1. If the clamp motor is locked, refer to the "Note 1 : How to open the
tray manually" in section 6. DISASSEMBLY (page 53).
5. Focus Offset Adjustment
@ Objective
To coarse adjust the DC offset voltage of the focus servo circuit for perform the tracking
adjustments correctly.
@ Symptom when out of | The model does not focus in, sound broken and the RF signal is dirty.
adjustment
@ Measurement instru-
| Connect the oscilloscope to
@ Player state
Spindle rotation frequency : Normal
ment connections
TP201 (CN601), Pin 1 (RF)
speed, focus ON, spindle ON/
tracking OFF
[Settings]
| 20mV/division
@ Adjustment
locati
10 ms/division
justment
location
| VR6 (FE. OFS)
[Procedure]
1. Move the pickup to midway across the disc (R=35mm).
2. In the normal speed, focus ON and spindle ON state, adjust VR6 (FE. OFS) so that the amplitude of TP201 (CN601),
Pin | (RF) becomes maximam.
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