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Step
CHGRST switch on
Abnormal Operation
for Each Step
1.
The DSKCHG indicator
does not go out.
HD LOAD switch on
1.
The plunger solenoid is
not energized.
Stepping
Track positioning
1. The step operation does
not function at all, or it
is not smoothly
functioned.
1.
The ratio of the left to
right signals does not
meet the specification.
2. No signal appears.
Check Points to Abnormal Operation
Check Point
(defective place)
I. The CHGRST signal (CN I 09-3)
is not sent to the CPU
(lCI01-9).
1. The HD LOAD signal
(at CNI09-14) is not sent to
the CPU (ICIOl-6).
2. IC III
3. IC 101
1. Stepping motor drive system
or stepping motor itself.
TRACK,.
Po(ICI06-5)
0,4,8, ••• 72,76.
H
1,5,9, ••• 73,77.
L
2,6,10, ••. 74, 78.
L
3,7,11, •.• 75,79.
H
2. The harness
(~
e, the TRK 00
sensor) is internally attached
to other mounting parts.
3. Obstacles are attached to the
slide guide shaft.
1. A voltage of +5 V is not applied
to the stepping motor.
(CNI05-I,2)
Remark.
Waveforms of normal operation
are;
HD LOAD
IC101-33
I
IC101-34
Fig.
3-7
In normal condition, the signal of
ICIOI-40 is High level for about
I msec after the STEP signal enters.
During this time, a DC voltage of
+12 V is applied to the stepping
motor.
PI (ICI06-9) P2(1CI06-11) P3(1CI06-13)
H
L
L
H
H
L
L
H
H
L
L
'H
2. Radial alignment is incomplete.
Refer to 5-4.
I. Read amplifier circuit.
Signal appeance must be confirmed
with the sequence ofCNI07-1,
ICI03-16, ICI03-17, ICI03-I,
ICI03-2, ICI04-7, ICI04-8.
2; A seek error has occurred_
Refer to 3-2-3.
-21 -
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