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FDD412A/B
—
oe
ee
:
Set
shorting-
plugs
to
specify
normal
operation
mode.
FDC
error
is
suspected. -
A-A
See
5.2
''Media-
Related
Troubles"
for
trouble-
shooting.
i
'
NO
ae
HEAD ENGAGE-N:
(1C16-17)
STEP-N
(TP-8)
|
o e ae
Read output
(TP1/2)
|
Re
ee
ee
WRITE
GATE-N
(1024-5)
|
oe
ers
LOW CURRENT-N:
(IC27-1)
|__NO_ovér
VFO SYNC,
DATA
GeO. SENCER
(1027-9)
ne
er
cee
DATA AREA-N
(1C27-5)
a
[MEM GATE-N
(1027-11)
YES
=}
ower
supply
NO
oltages
normal?
+5V (J2-3)
TES 494y (12-1)
Has
over-
YES
:
voltage
damaged
Normal
opération
:
:
NO
=
circuit?
ode
specified
wit
shorting-plugs?
NO
Apply
normal
line
voltage.
Replace
damaged
circuit.
YES
Head
loaded
on?
MY
Wait~time
normal
a"
™~
after
HEAD
ENGAGE
OF
STEP
pulse?
YES
NO
EAD
ENGAG
signal
input?
NO
Spindle
motor
revolutions
normal?
Head
load
NO
FE
AES
olenoid
|
a
ie
YES
Réad waveshape
YES
(envelope)
normal?
NO
Replace
head
load
solenoid.
solyf J
Read
operation
NO
performed
during~
within
580
us of
WRITE
GATE?
YES
Or.
_
_—
;
Replace PWB Asse
l
LOW
CURRENT
N
-
signal
control
normal?
"SS
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