Cd-Rw Record Power Adjustment - Pioneer PDR-609 Service Manual

6.6.3 CD-RW Record Power Adjustment

Test Point
Adjustment Value
Purpose
Symptom when Out of Adjustment
[Procedure]
1. Enter the Test mode.
2. Press the INPUT SELECTOR key so that "ANALOG" appears on the FL display.
3. Press the ERASE key so that "CD-RW" appears on the FL display.
4. Move the pickup to the position where the power is easy to measure by pressing the SCAN key.
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5. Press the RECORD and REC MUTE key in order, and light the LD.
<Adjustment of CD-RW BIAS Power>
6. Turn the JOG key to adjust the power.
Switch the coarse adjustment and the fine adjustment by pressing the RECORD key, and adjust it.
(initial state is the coarse adjustment.)
7. Press the PLAY/PAUSE key to register the adjustment if the power became the adjustment value.
When it is registered, shift to the CD-RW Record Power Adjustment automatically.
Note: In the CD-RW Bias Power Adjustment, in the case that the power is over 2.3 mW when the LD
lighted, do not need to perform the Bias Power Adjustment. Set adjustment value of the CD-RW
record power to + 0.9mW ± 0.05mW against the power in LD lighting then.
<Adjustment of CD-RW Record Power>
8. Turn the JOG key to adjust the power.
Switch the coarse adjustment and the fine adjustment by pressing the RECORD key, and adjust it.
(initial state is the coarse adjustment.)
9. Press the PLAY/PAUSE key to register the adjustment if the power became the adjustment value.
When it is registered, shift to the CD-RW Erase Power Adjustment automatically.
<Adjustment of CD-RW Erase Power>
10.Turn the JOG key to adjust the power.
Switch the coarse adjustment and the fine adjustment by pressing the RECORD key, and adjust it.
(initial state is the coarse adjustment.)
11. Press the ENTER key to register the adjustment if the power became the adjustment value.
12. Press the STOP key to goes out the LD, and adjustment is completed.
Cautions:
(1) All the reading values of power meter of this adjustment are values with an average.
(2) How to confirm the adjustment value:
When enter the power adjustment mode, enter it by pressing the RECORD and TIME keys in order.
Furthermore, can confirm the adjustment value of each power stored in EEPROM by switching the TIME key.
However, RW cannot see all adjustment results. Use DAC the same as erase power in the Bias Power Adjustment, and
perform the adjustment of record power while outputting the setting value of erase power decided in the Bias Power
Adjustment. And perform the Erase Power Adjustment while outputting the setting value of the record power.
Therefore, the value of Bias Power Adjustment does not remain after adjustment of the erase power. (as for the displayed
adjustment value, erase power is the same as bias power.)
It is only erase power that can confirm the adjustment result with the power meter among power of RW.
As for the value of Record Power Adjustment, only setting numeric value is readable, but output power becomes the same
as the erase power.
Bias power cannot confirm the setting value, too. Be not used during actual record operations either.
DANGER – LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
Pickup objective lens
RW Bias : 2.3 mW ± 0.05 mW, RW Rec : 3.2 mW ± 0.05 mW, RW Erase : 5.2 mW ± 0.1 mW
Optimizing CD-RW recording power of laser diode.
Incapable of CD-RW recording, self-pre recorded CD-RW disc playback. Sound
pauses, track jumping, or bad RF wave shape (though no failure in playing CD).
Adjustment method
PDR-609
FL Indication
55