Sony D-555 - Service Mode Operation; Setting Service Mode; Operating Service Mode; Exiting Service Mode

SERVICE MODE (service program)
This set has built-in service program in the micro-
computer as usual sets.
The operation method of service program is ex-
plained below.
[ads
Main operation in service mode
for details, refer to step 2.
@ (STOP)
[servo all off]
PIL (PLAY/PAUSE)
he OCUS on and CLV-S ]
mode (RUN-UP mode) on
PPI(FF)
el goes to ou ieee)
circum ference.
Be
KEY-MODE
Hi
144(FR)
tracking
servo
=a
OFF
«ON
ere
goes
to
jai)
sled
servo
on
REMAIN circumference.
(display stop]
Be sure to set HOLD switch OFF.
If not key inputs can not be operated.
Fig. 3 Key Positions
Step 1 (Service Mode setting method)
1. Turn the HOLD switch OFF with the external
power supply not plugged in (no power applied
to set) and press the PUT key.
2. Solder jumper TEST point.
(IC801 pin (9) (BAT-E) pin is grounded.
3. Plugin external power supply.
This puts the set into service mode.
— main board —
L
| D-555/Z555
Step 2 (Service Mode operation)
1, When service mode is set, the display will
change
6
times,
and
those
6
changes
will
be
repeated over and over.
With
this
the
LCD
display
should
be
present
in
service
mode,
Even
if
LCD
does
not
display,
other
operations
will
be
performed.
2.
When
DP
or
Kd
key
is
pressed,
the
UPF
moves
to
the
inside
or
outside
circumference.
Tracking
servo
and
sled
servo
go
off
when
this
is
done,
so
press
KEY-MODE
to
turn
on
the
tracking
servo
if
necessary.
3.
When
REMAIN
is
pressed,
the
display
stops.
When
REMAIN
is
released,
the
display
con-
tinues
to
change.
This
allows
check
of
each
segment.
4.
When
Pil
key
is
pressed,
CLV-S
(pull-in
mode)
starts
while
performing
focus
search.
When
there
is
no
disc
installed,
focus
search
is
re-
peated
several
times
while
disc
motor
is
rotating.
5.
When
KEY-MODE
is
pressed,
tracking
servo,
sled
servo
and
CLV-A
(servo
during
PLAY)
go
ON.
6. When 4 and 5 are performed, the disc begins to
play. At this time, the top panel should be
closed and S901 are to be ON.
7. All servo (focus, tracking, sled and spindle) go
off when M key is pressed. But disc motor
continues rotating for a while by inartia.
Step 3 (Service Mode release)
1, First be sure to unplug the external power
supply, then remove the TEST point solder
jumper.
2. The set will now operated normally.
TEST
Solder jumper for service mode.
sited checking or adjusting in service a
be sure to remove this solder jumper.
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Fig. 4 TEST Point Position
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