SECTION 4
SERVICE MODE
Service Mode (service program)Y Step 3 (Resetting service mode )
The equipment is provided with a service program built in the mi-1. Be sure to disconnect the external power supply and remove the
crocomputer, like conventional models.solder bridge at the TEST terminals connected in setting.
Service program operation methods are described in the following.2. The set thus becomes available for normal operation.
REPEAT/ENTER� MAIN BOARD � (Side B)
Tracking gain-up mode while pressing
PLAY MODE+ (FF)
Tracking servo and sled The optical pick-up
servo are turned ONis moved outwardly
HOLD OFF n ON
^ (PLAY/PAUSE)
Be sure to turn OFF FOCUS is turned ON
the HOLD switch
to effect pull in mode
(if ON, pressing each key is
deactivated)= (FR) R806
36302519
The optical pick-up
is moved inwardly TP501
3718
p (STOP)80C806
4015
All servos are turned OFFIC801
TP821
X801
4510
Fig. 4-1 Layout of each keyP822505
7541
Y Step 1 (Service mode setting method)
55 60 65 70 72
1. Turn OFF the HOLD switch the external power supply discon-TP511
C879TP502
nected (power is not applied to the set).TP512 C516
TP523
2. Solder across the TP816 (TEST) terminals (pin %a , IC801 (TEST) TP503
TP507TP816 R809R510
is grounded).C549
(TEST)Q501
3. Connect an external power supply.L502
TP508
Thus, the set is switched to the service mode.TP506
R506 TP532
R507 TP547
R505
Y Step 2 (Operation in the service mode )TP555
TP534R509
1. Once the service mode is effected, the LCD displays 5 indica-
TP505
tions each of which is repeatedly displayed.TP518
However, the following operations can be activated even if LCD
TP816 (TEST)
indication is effected.
Normal mode : Open
2. By pressing the + or = key, the optical pick-up movable
Test mode : Short
inwardly or outwardly. However, if this is activated, tracking
servo and sled servo are turned OFF, so it can be turned ON by
pressing the PLAY MODE key, if required.Fig. 4-2 Location of test terminal
3. By pressing the REPEAT/ENTER key, the tracking gain-up mode
becomes active.
4. By pressing the ^ key, focus is turned ON from focus search-
ing while entering CLV-S (pull-in mode).
Without disc, focus searching is repeated continuously.
5. By pressing the PLAY MODE key, tracking servo, sled servo
and CLV-A (servo in PLAY) are turned ON.
6. When 4. and 5. are performed, playing begins. No muting is ON
in the service mode.
7. By pressing the p key, all servos (focus tracking and sled) are
turned OFF. However, the disc motor revolves for a while by
inertia.
� 7 � |
ACEC
