Service Mode - Sony D-E551 Service Manual

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Service Mode (Service program)
The equipment is provided with a service program built in the
microcomputer, like conventional models.
Service program operation methods are described in the follow-
ing.
PLAY MODE
Tracking servo and sled
HOLD c
servo are turned ON
Be sure to turn OFF
the HOLD switch
(If ON, all the LCD
indication and
LED are light up)
= (FR)
The optical pick-up
is moved inwardly
+ (FF)
The optical pick-up
is moved outwardly
Descriptions in [ ] indicate major operations in the service
mode. For more informatrion, see Step 2.
TE
L 13942296513 Fig. 1 Layout of each key
• Step 1 (Service mode setting methods)
1. Turn OFF the HOLD switch with external power supply dis-
connected. (power is not applied to the set)
2. Solder across the TEST terminals (TAP802). (pin %¢, IC801
(ESPSL/TEST) is grounded)
3. Connect an external power supply.
Thus, the set is switched to the service mode.
• Step 2 (Operation in the service mode)
1. Once the service mode is effected, the LCD displays 5 indica-
tions each of which is repeatedly displayed.
However, the following operations can be activated even if LCD
indication is effected.
2. By pressing the + or = key, the optical pick-up is mov-
able inwardly or outwardly. However, if this is activated, track-
ing 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.
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SECTION 4

SERVICE MODE

REPEAT/ENTER
Tracking gain-up mode
while pressing
^ (PLAY/PAUSE)
Focus is tuned ON to
effect draw-in mode
p (STOP)
[All servos are turned OFF]
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4. By pressing the ^ key, focus is turned ON from focus search-
ing while entering CLV-S. (draw-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 step 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.
• Step 3 (Resetting of service mode)
1. Be sure to disconnect the external power supply and remove
the solder bridge at the TEST terminals connected before in
setting.
2. The set thus becomes available for normal operation.
– MAIN BOARD (Side A) –
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3 6 7 1 3 1 5
TAP802
(TEST)
Fig. 2 Location of Test terminal
co
.
9 4 2 8
0 5 8 2 9 9 4 2 8
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