Sony CDP-XB920 Service Manual page 10

4-2. ADJ MODE
The following operations are performed in the ADJ mode, which is
set by connecting the TP21 (ADJ) terminal to the Ground and turning
on the power.
• During playback, there is no problem even if the GFS is continu-
ously LOW.
• High speed search is prohibited during access.
• During playback, the gain of focus servo and spindle servo does
not decrease.
• Servo related manual operations and measurement can be per-
formed.
(For details of operations, refer to Table of Key Operations in
ADJ Mode.)
4-3. CLV-S MODE
The spindle servo for playback sets into the CLV-S mode when the
TP21 (ADJ) terminal is connected to Ground after turning on the
power.
TABLE OF BUTTON OPERATIONS IN ADJ MODE
The jitter value display mode can be set after the all-music remaining
number mode using the TIME/TEXT button.
The functions of the number buttons are shown in the following
table.
FUNCTIONS OF NUMBER BUTTONS
(With the attached remote commander)
Button
1 Focus bias 8-step up (hexadecimal)
2 Middle of focus bias up/down turning point
3 Focus bias optimum point, jitter value
Tracking servo, sled servo off
4
5 Tracking gain up
6 Focus bias 8-step down (hexadecimal)
7 Immediate readjustment of focus bias
8 Focus bias 00 point
Tracking servo, sled servo on
9
10 Tracking gain down
Function
— 10 —
[MAIN BOARD] — (Component Side) —
TP21
TP51
(ADJ)
(AF ADJ)
R350
CN305 CN304
4-4. AGING MODE
This unit is equipped with an aging mode to check operations of the
mechanism deck.
• When faults occur:
Aging stops, and the state when aging stopped is displayed on the
fluorescent display tube.
• When no fault has occurred:
Aging is continued repeatedly.
Aging method 1
(When using the aging mode remote controller (J-2501-123-A)):
1. Press the U button and turn ON the power.
2. Set the disc on the tray.
3. Press the AGING START button of the aging remote control-
ler.
4. Aging starts and the message shown in Fig. 1 is displayed on
the fluoresent display tube.
5. To end, press the U button.
Aging method 2 (When no aging mode remote controller):
1. Press the U button and turn ON the power.
2. Set the disc on the tray.
3. Press the § OPEN/CLOSE button, p button, and
MUSIC SCAN button at the same time. (If these buttons are
not pressed at the same time, nothing performs.)
4. Aging starts and the message shown in Fig. 1 is displayed on
the fluoresent display tube.
5. To end, press the U button.
Fig.1 Message in Aging Mode
Code
State
No.
0 Load in
1 Access to TOC
2 Access to last track
Playback of last track
3
(3 seconds)
4 Access to first track
Playback of first track
5
(3 seconds)
6 Load out
Display when Display when
abnormal
normal
AGING-0 ERROR-0
AGING-1 ERROR-1
AGING-2 ERROR-2
Counter
ERROR-3
display
AGING-4 ERROR-4
Counter
ERROR-5
display
AGING-6 ERROR-6