Sony D-5 - Laser Diode Check Procedure; Procedure 1; Procedure 2

in service mode
to step 2.
de.
in service mode,
ar jumper.
Step 2 (Service Mode operation)
1.
When service mode is set, the display will
change 16 times, and those 16 changes will be
repeated over and over.
Note: Some sets using MB88541-120M for
microcomputer IC801 will not perform
LCD display.
If this happens:
1) Play a disc with the set in normal
operation.
2) In that state, solder jumper BATT2
point. (See Figure 3)
3) Short the RESET point once and
release. (See Figure 3)
4) Plug in external power supply.
With this the LCD display should be present
in service mode, Even if LCD does not display,
other operations will be performed.
When @ key is pressed during each operation,
it will return to the state in step 1.
When PP or Kd key is pressed, the FOP
moves to the inside or outside circumference.
Tracking servo and sled servo go off when this
is done, so press MODE to turn on the tracking
servo if necessary.
When REMAIN is pressed, the display stops.
When REMAIN is released, the display con-
tinues to change. This allows check of each
segment.
Whenp key is pressed, focus search starts,
then CLV-S (run-up mode) starts. When there
is no disc, focus search is repeated again and
again.
Note: When MB88541-120M is used for micro-
computer IC801, the objective lens may
remain up and the disc table may rotate
at high speed when thep§ffkey is
pressed,
(Sets using MB88541-120M for IC801
will set FOCUS ON FLAG after the
focus on state has been obtained.)
If this happens:
1) Press MM key.
2) Unplug external power supply and
press > Bikey.
3) Plug in external power supply.
4) Press» §Hkey without disc inserted.
With this, focus search will repeat over and
over.
When MODE is pressed, tracking servo, sled
servo and CLV-A (servo during PLAY) go ON.
When 5 and 6 are performed, the disc begins
to play. At this time, the top panel should be
D-5/D-50 D-5/D-50
closed and S901 and $902 are to be ON.
When the laser is not emitted, focus search
is repeated. When S901 is on and S902 is off,
CLV-S does not work properly and the disc
rotates at high speed.
Step 3 (Service Mode release)
1.
2.
First be sure to unplug the external power
supply, then remove the BATT2 point solder
jumper.
(During service mode, C803 is discharged by
unplugging the external power supply. There-
fore, microcomputer IC801 is reset by next
plugging in the external power supply.)
The set will now operate normally.
MAIN BOARD (double-sided) CHECK
1.
The main board is double-sided, so there are
parts mounted on both sides. However, check-
ing can be done from the chip component
mounted side. Refer to the mounting diagram
on page 43 — 46.
D/A coverter IC’s are mounted underneath the
DC-DC converter unit, and these can be check-
ed from the chip component mounted side.
IC’s under the DC-DC converter unit:
1C301: D/A converter
IC101, 201: integrator, sample hold
1C302: switcher
When operating the set with the LCD module
flexible board removed, the pattern corre-
sponding to each key switch is to be grounded
momentarily,
“€P301 OC=OC, CONVERTER
ns
ea -
Det ere
SW pattern) pag ere”
Move a2 o
REMAIN__scwrcusii
Ground —_—esecnn»'’ .
S907
laser on
(
Laser Diode Check Procedure
The laser diode on this set will not emit unless the
top panel is closed and S901 (terminal sorting type),
S902 (leaf SW type) are turned on.
Focus search can be operated in service mode even if
$902 is OFF, so that the laser diode will emit if S901
(terminal shorting type) are turned on in this mode.
The laser diode is checked using the current value
which flows to the laser diode inside the FOP.
Procedure 1 (service mode or normal operation).
1. Close the top panel.
2. Connect an ammeter as shown in Figure 5.
3. Press the PMH key.
4
. Confirm that the ammeter reading is within
the range given below.
10-100 mA
If not, APC circuit or FOP is defective.
If normal operation is used, the laser diode
goes on for about 3 seconds due to focus
search.
Remove the brown FS1 lead and connect the ammeter
as shown.
n: The disc we)
is shut.
ammeter
Fig. 5 Ammeter Connection
Procedure 2 (service mode or normal operation).
1. Close the top panel.
2. Remove the main board and read the current
value on the label affixed to the FOP.
(Label on FOP)
SONYY Japan
LASER POWER 0.4mW MAX.
KSS-110A
current value
07740
The current value varies with the set.
3. Mount the main board and connect an
ammeter as shown in Figure S.
4. Press the > Bkey.
5. Confirm that the ammeter reading is within
the range given below.
value on label” i'ma (25°C)
variation relative to temperature:
0.4 mA/°C
(Current increases when temperature rises
and decreases when it drops.)
If the value is more than the range given,
APC circuit has been defective or the laser
diode has deteriorated. If it is less, APC
‘circuit or FOP is defective.
This means 49.9 mA.