Pioneer PDR-W839 Service Manual Download

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PDR-W839

[Procedure]

1. Enter the Test mode.

2. Press the INPUT 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.

(

41 ¡¢

)

5. Press the REC/REC MUTE and NAME key in order, and light the LD.

6. Turn the JOG key to adjust the power.

Switch the coarse adjustment and the fine adjustment by pressing the REC/REC MUTE 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.

8. Turn the JOG key to adjust the power.

Switch the coarse adjustment and the fine adjustment by pressing the REC/REC MUTE 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.

10. Turn the JOG key to adjust the power.

Switch the coarse adjustment and the fine adjustment by pressing the REC/REC MUTE 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.

6.7.3 CD-RW Record Power Adjustment

RW Bias : 2.3 mW

0.05 mW, RW Rec : 3.2 mW

0.05 mW, RW Erase : 5.2 mW

0.1 mW

Pickup objective lens

Optimizing CD-RW recording power of laser diode.

Incapable of CD-RW recording, playing CD-RWs recorded on it. Sound pauses,
track skipping, or bad RF wave form (though no failure in playing CD).

Test Point

Adjustment Value

Purpose

Symptom when Out of Adjustment

Adjustment method

FL Indication

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 REC/REC MUTE and DISPLAY keys in order.
Furthermore, can confirm the adjustment value of each power stored in EEPROM by switching the DISPLAY 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.