Sony OA-D32W Service Manual page 20

::heck Points to Abnormal Operation
Step
Abnormal Operation Check Point
Remarks
for Each Step (defective place)
Motor speed I. The motor speed does not 1. The disk motor
Refer to 5-8.
meet the specification. 2. The pad pressure
Refer to 5-2.
Index position
I. When the cassette is 1. The chucking mechanism of
Refer to 4-11.
inserted twice or more, the disk moter is defective.
positions on each track
is varied ±40 p.sec or
more.
2. When the cassette is set
1. The INDEX phase is Refer to 5-6.
twice or more, positions
mis-adjusted.
on each track is varied
±40 Ilsec or less. The
shifted positions,
however, do not meet·
the specification.
TRK 00 sensor level
I. The head returned from 1. The TRK 00 sensor positioning
The signal level of CNI07-5
inside track does not is improper.
is 3 V or more at TRK 01 during
stop at TRK 0 I and it
normal operation. (Refer to 5-4.)
goes to TRK 00 where
re-calibration is to be
carried out.
Cassette out
1. When the casette is
1. Signal has not been detecte'd The signal of CNIOI-S remains
(When the alignment
ejected, the DSKCHG cassette ejection. Check if
Low level.
disk is ej ected.)
indicator does not the D-detected arm moves
light. properly.
2. Check if the disk motor
I
circuit board operates
properly.
3. Signal appearance must be
confirmed with the sequence
ofICI01-3,IC112-I,
IC112-3, CNI09-3.
Write
I. The waveform signal
1. Write circuit iEEChange the SIDE SELECT
(When the level disk cannot be re-written.
SWITCH to side I and then
is inserted.)
conduct the operation speci-
fied in item 13-1 of NORMAL
OPERATION.
In normal condition of write gate
circuit, terminal voltage of CN I 09
-12 is Low level, terminal voltage
of ICIOI-46 is High level,
terminal voltage oflC 11 5-4 is
High level and
Em
Collector voltage ofQI06 is
approx. +12·V.
e
When SIDE SELECT switch is
set to side 0, collector voltage
of Q 107 is approx. +12 V.
When it is set to side I,
collector voltage of Q 106 is
approx.+12 V.
2. Check whether write data
is applied or not.
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