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(J2-3)
(J2-1)[*
Power
supply
+5V:
+24V:
NO
FDD412A/B
WRITE
GATE-N
(1024-5)
STEP—N
(TP-3)
TRACK
OO-P
:
(TP-9)
STEP
DIRECTION-N:
(1C12-5)
Voltages
normal?
yas
Seek
operation
YES
specified
during
or
within
580
us of
WRITE
GATE?
NO
ero
trac
setting
normal?
kis
EDC
ae
STEP
pulse
eae
output
timing
suspected.
YES
DIRECTION
NO
output
timing
pecification
normal?~
YES
YES
HaS
over=
voltage
danseed-
circuit?
perates
in phase-
excitation
Replace
damaged .
NO
circuit
Apply
correct
4
line
voltages.
|
jee
ee
sensor
operates
nermally?
YES
Replace
zero
sensor.
(J3-5)
Step
motor
x
NO
normally?
YES
|_Replacé PWB
Assembly.
Fig. 5.4
Seek Error
~81-—
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