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 A)
Tracking gain-up mode while pressing
HOLD OFF n ON
Be sure to turn OFF the HOLD switch
(if ON, pressing each key is deactivated)
PLAY MODE
Tracking servo and sled
servo are turned ON
p ^
^ (PLAY/PAUSE)
= (FR)
FOCUS is turned ON
The optical pick-up
to effect pull in mode
is moved inwardly
20
p (STOP)0C407TP301
All servos are turned OFFR307241
+ (FF)
L402C420
The optical pick-up5R308C302R
is moved outwardlyC417
0
9TP862
TP857
Fig. 4-1 Layout of each keyC814
D407C809R830 Q302
T802
(TEST)
Y Step 1 (Service mode setting method)
R808
1. Turn OFF the HOLD switch the external power supply discon-
nected (power is not applied to the set).
2. Solder across the T802 (TEST) terminals (pin %a, IC801 (TEST)
is grounded).
3. Connect an external power supply.
Thus, the set is switched to the service mode.
Y Step 2 (Operation in the service mode )
1. Once the service mode is effected, the LCD displays 5 indica- T802 (TEST)
tions each of which is repeatedly displayed.Normal mode : Open
Test mode : Short
However, the following operations can be activated even if LCD
indication is effected.
2. By pressing the + or = key, the optical pick-up movableFig. 4-2 Location of test terminal
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.
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
