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TROUBLESHOOTING
AND DIAGNOSTICS
PROCEDURES P0 THROUGH P4
1. Check primary fuse
2. Check setting of the primary voltage select switch (See Figure 8-9).
3. Check power supply voltages on the power supply PCA. (See Figure 8-3)
4. Check cables to power supply and drives.
5. Replace controller assembly if preceding steps do not correct problem.
The complete description of the power-on selftest indications is provided on page 8-6.
The following in-
formation indicates the probable repairs if the FAULT LED is blinking at power on:
INDICATION
PROBLEM
FAULT
LED
on
6 seconds,
blinks
ROM
checksum
wrong.
Replace
ROM's
off
1 time,
repeats
or
controller
board
FAULT
LED
on
6 seconds,
blinks
Controller
configuration
switches
off
4 times,
repeats
set
to
an
illegal
configuration.
Set
switches
for
correct
configuration
for
product.
(See Figure
8-8)
All
other
FAULT
LED
blink
Controller
fault.
Replace
the
indications
controller.
PROCEDURE P2 (FAULT LED on)
NOTE
If the Winchester disc has just been replaced, it is necessary to
format the drive and then cycle power before the product will
pass the power-on selftest.
Neither drive accessed during selftest (9153A/B only)
1. Check power supply voltages (Figure 8-1)
2. Ensure that all cables are connected properly.
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