Check Points To Abnormal Operation - Sony OA-D32W Service Manual

Check Points to Abnormal Operation
3-3-2. Check Points to Abnormal Operation
Step
Power On
Drive Select Check
after checked, the
disk drive is to be
kept selected.
Operation during
CASSETTE IN
(Alignment disk is
to be inserted.)
MOTOR ON
switch on
Abnormal Operation
for Each Step
I. The head
~oves
tow!ll'd
the center of the Drive.
2. The head is stepped out,
but it is idling around
the outmost track.
3. The head moves
uncertainly. (The head
movement is not
constant.)
4. The disk motor rotates.
1. The I/F indicators are
put out for the selected
combination, or they
are lit for the unselected
combination.
1. After the cassette is
inserted, the head is
not loaded and the motor
does not rotate.
2. The head is loaded, but
the motor does not
rotate.
3. The disk motor rotates,
but the head is not
loaded.
I. The disk motor does not
rotate.
2. The IJF indicators do not
light.
CheckPoint
(defective place)
I. TRK 00 sensing circuit.
1.
TRK 00 sensing circuit.
2. Check if the TRK 00 Sensor
Mounted Board is installed a
little bit outside.
1.
Stepping motor drive system.
NOTE: If
no
TRK 00 is
detected
in
several seconds after power
is turned on, the CPU auto-
matically stops the stepping
motor and thereafter accepts
no
instructioh.
1. Disk motor drive system.
1.
Drive select circuit system.
1. The CSTIN signal does not
appear at CNIOI-5, and it is
not sent from the motor.
2. The cassette is not properly
placed.
1. The disk motor.
1. Plunger solenoid ·or its drive
system.
2. Plunger stroke.
3. Head Clearance.
4. HL arm height.
1. Disk motor drive system.
1. If no I/F indicato!S is
lit, the drive select is not
conducted.
2. If some IfF indicators are lit,
the IfF signal circuit is
defective.
-20-
Remarks
Thcl signal of CN 103-2 is Low level
The signal of CN 103-2 is High level
A voltage of+12 V appears at
CN I 05-2 during normal operation.
Voltages at 3 pin through 6 pin of
of CNI05 are switched in
10
±
0.1 msec intervals.
The signal CNIOI-5 and CNIOI-?
are Low level
The signal ofICIOS-3 for the
selected combination is High level
during normal operation. The
signal ofICIOS-3 is Low level for
unselected combipation.
Refer to 5-S.
Refer to 5-S.
The signal waveforms shown below
appear of CNI04-2, 3.
During normal operation.
Refer to 5-10.
Refer to 5-9.
(Refer to Fig.
3~6)
The signal of CNIOI-? is High level,
or the disk motor is defective.
+12V_a
c
,
+5~-----'\L.-..
_ _ _ _ _ _ _ 1
CN104.3f OISK IN
CN104·2 """5 V
r--
It----15-m-s-ec-.
- - - f
l
Fig.
3·6