4
D-EJ775
SERVICE MODE
In the Service mode, this set can check the following.
1. Service Mode Setting Method
To set the service mode, perform as follows.
1) Make sure that the power is not turned on.
2) Check for the following states:
[HOLD]
switch (S802) .......................... OFF
[SOUND]
switch (S808) ....................... OFF
[G PROTECTION]
switch (S803) ....... ON
3) Short the solder bridge at the TAP801 (TEST) and TAP802
(OPEN) on the MAIN board (see Fig. 2).
4) Turn the power on.
2. Operation in Service Mode
When the Service mode is set, the LCD on the remote commander
displays the microcomputer version display.
3. Operation of Buttons in Service Mode
The following operation can be checked by operating the buttons
on the set and remote commander.
•
N>
/
.
keys on the set or remote commander
Tracking/sled servo off
Focus search Spindle servo on
Note:
Do not look directly at the laser beam from the optical pick-up.
•
[VOL +]
/
[VOL --]
keys on the set or remote commander
Tracking servo off
Optical pick-up movement (outward or inward)
Note:
Do not move forcibly the optical pick-up exceeding the most-out-
side or most-inside track.
•
x
key on the set or remote commander
All servos (focus/tracking/sled) off
•
[MENU]
key on the set
Spindle speed change
Tracking/sled servo on
•
[SOUND]
key on the sed
Servo auto adjustment
4. Service Mode Releasing Method
To release the service mode, perform as follows.
1) Turn the power off.
2) Open the solder bridge at the TAP801 (TEST) and TAP802
(OPEN) on the MAIN board.
Note:
Remove the solder completely.
– MAIN Board (Component Side) –
Fig. 2
TAP801 (TEST)
TAP802 (OPEN)
•
00
0052
R
microcomputer version
