PROBLEM
1. SAFE lamp does not
light.
2.
PressingRUN/STOP
pushbutton does not
start motor.
Table
8-1
Troubleshooting Procedure Chart
PROBABLE CAUSE RECOMMENDED REPAIR
1. Defective lamp.
1.
Replace lamp.
2.
Positioner has moved out,
2.
Push positioner back to fully retracted position.
away from fully retracted
position.
3.
Power supply voltages not
3.
Refer
to
Power Supply Fault Isolation Procedure, Paragraph B6.
within tolerances.
4.
Disk rotation detector counter
4.
Check U283-15 on Logic PCBA.
If
U283-15 is
low
when the
disk
has
circuitry (on Logic PCBA)
stopped rotating, and U284-21s also low, replace the Logic PCBA.
If
continues to indicate rotation
U283-15
is
low and U284-2 is high, reter to Recommended Repair
after disk has stopped.
column, Problem
21.
5.
Brake cycle enable flip-flop
5.
It
U384-15Is low when U384-3Is high, replace Logic PCBA.
U384-15 on
logic
PCBA does
not go high; therefore, the
brake cycle enable circuit
Is
not enabling the safe mode.
1. Cartridge interlock switch is
1.
Check cartridge Interlock switch; check cartridge Interlock system.
defective or other problem
Reter to Paragraph 6.15
In
manual, Cartridge Interlock System - Front
exists in interlock system.
Load models;
or
Paragraph 6.16 for Top Load models.
Check logic
level at
Jl09-2
(Logic PCBA).
If
low, replace the Logic
PCBA.
If
high, replace the RUN/STOP pushbutton.
2.
Emergency unload abort.
2.
Check logic level at U306-8
on
Logic
PCBA.
If
high,
see
Recommended
Repair column, Problem 14. A
low
at U306-8 indicates
an
absence
of
the emergency unload condition.
3.
RUN/STOP pushbutton does
3.
Check logic level at U447-5 while pressing the RUN/STOP pushbutton.
not set
U364-15
high.
If
U447-5 stays high, replace the RUN/STOP pushbutton. Replace the
Logic PCBA
if
the
following
conditions occur simultaneously:
a.
U47-5 Is low (Logic PCBA).
b. U364-15 stays
low
(Lagle PCBA).
c. An emergency unload is not present.
d. The
SAFE lamp is
lit.
,
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