CDR-205TX
ADJUSTMENT PROCEDURES-6
6. SERVO ADJUSTMENT
6.4 Focus Bias Adjustment
Minimize jitter value
CN102-pin 2 (RF)
Test Point
Adjustment Value
Focus-in does not function, sound pauses, bad RF wave shape, or incapable to
playback some discs.
Optimizing DC offset voltage of focus servo loop circuit including pickup.
Purpose
Symptom when Out of Adjustment
Adjustment method
FL Indication
CN102
RF
2
10: 1 prove
Jitter meter
[Procedure]
1. Move the Pickup to center of the disc by pressing the REWIND or FAST FORWARD key ( / ).
2. Monitor the jitter value and set a CD disc. (use the jitter meter)
3. Press the FINALIZE key to FOCUS IN.
4. Press the PLAY/PAUSE key to turn the SPINDLE. (CAV)
5. Press the PLAY/PAUSE key to TRACKING ON. (EFM CLV)
6. Adjust the JOG(AMCS) key so that jitter value becomes minimum.
7. Press the ENTER key to register the adjustment.
Shift to the RFDC Level Adjustment automatically.
8. Adjustment is completed automatically.
Each display the reason that became abnormal when adjustment was not completed normally.
When did not converge in limit of adjustment possibility
(when it became the lowest level)
When failed in writing to the EEPROM
9. Press the STOP key to stop the operation.
Cautions:
In this adjustment, shift to the RFDC Adjustment when pressing the ENTER key before step 7,
and there is it when completed in normal on the indication.
However, must not omit operation of steps 5 from 3 because RFDC is not adjusted to normal when
pressing the ENTER key with the state that steps 5 from 3 are not executed.
" FBIAS_XX_?_ _ "
" RFDC_ _ADJ_OK "
" RFDC_ _ADJ_NG "
" RFDC_ _EEP_NG "
" FBIAS_XX_ _ _ _ "
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