CDR-205TX
ADJUSTMENT PROCEDURES-6
6. SERVO ADJUSTMENT
6.4 Focus Bias Adjustment
Test PointCN102-pin 2 (RF)
Adjustment ValueMinimize jitter value
PurposeOptimizing DC offset voltage of focus servo loop circuit including pickup.
Symptom when Out of Adjustment Focus-in does not function, sound pauses, bad RF wave shape, or incapable to
playback some discs.
Adjustment methodFL Indication
[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." FBIAS_XX_?_ _ "
7. Press the ENTER key to register the adjustment.
Shift to the RFDC Level Adjustment automatically." RFDC_ _ADJ_OK "
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" RFDC_ _ADJ_NG "
(when it became the lowest level)
When failed in writing to the EEPROM" RFDC_ _EEP_NG "
9. Press the STOP key to stop the operation." FBIAS_XX_ _ _ _ "
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.
CN102
RF2
10: 1 proveJitter meter
VC6
How to execute the automatic adjustment once again after the automatic adjustment is completed:
1. Press the STOP key to stop the disc rotation. (servo OFF)
2. Press the EDIT/NO + YES key and shift to the Focus Offset adjustment.
3. Press the REC key to start the automatic adjustment.
Adjust from "6.2 Automatic Adjustment Start" to "6.4 Focus Bias Adjustment".
Press the STOP key when stops execution of the automatic adjustment on the way and stop processing.
Then return to the state of
"6.1 Preparations" and stop the operation. |
ACEC
ONKYO
