HP Integral Personal Computer Service Manual page 145

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,.. ...... 21. Troubleshooting til. Plug-In 11011
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Use the following procedure to troubleshoot and repair a ROM problem.
In each of these steps,
always turn off the power before you connect
or
disconnect a cable
or
replace a component.
Note. A ROM problem can prevent the computer from turning on. If the computer will not
turn on, refer to table 8-2, lurn-On Problems."
Step
1. Turn on the computer with the operating
system ROM installed.
2. Insert the service diagnostic disc and run
the ROM test (refer to section
8.5.4).
3. Replace the ROM IC(s) identified as bad.
It
more than two ROM error messages appear,
go
to
step
5
instead.
***
ERROR-3el (Ul-ROMeL on
0.5. ROM PCA)
***
ERROR-302 (U2-ROM1L on
O.S. ROM peR)
***
ERROR-3eJ (U3-ROMeH on
0.5.
ROM PCA)
***
ERROR-304 (U4-ROM1H on
O.S. ROM
peA)
***
ERROR-401 (Ul-ROM2H on
Option ROM peR)
***
ERROR-402
(U2~ROMJH
on
Option ROM
peA)
***
ERROR-40J (U3-ROM2L on
Option ROM
peA)
***
ERROR-404 (U4-ROM3L on
OPtion ROM peA)
4. Repeat the ROM test.
5. Replace the operating system ROM PCA
and repeat the ROM test.
I
1...uc.tecI Action
If the computer doesn't
turn
on, refer to table
8-2.
If the error messages
***
The ROM Assembly failed.
***
Checksum does not match.
appear, the procedure depends on the operating
system version:
• If the computer has the
HP-UX System III op-
erating system, there is no component-level
repair. Replace the plug-in ROM assembly .
• If the computer has the HP-UX System Vop-
erating system, the above messages will be
followed by an error message identifying the
defective IC. Proceed with step
3.
Replace Ul (ROM 0, low byte) on the operating
system PCA.
Replace U2 (ROM 1, low byte) on the operating
system PCA.
Replace
U3
(ROM
0,
high byte) on the operating
system peA.
Replace
U4
(ROM
1,
high byte) on the operating
system PCA.
Replace Ul (ROM 2, high byte) on the option
ROM PCA.
Replace U2 (ROM 3, high byte) on the option
ROM PCA.
Replace
U3
(ROM
2,
low byte) on the option
ROM PCA.
Replace U4 (ROM 3, low byte) on the option
ROM PCA.
If the problem is still not corrected, go on to
step 5.
If the problem is still not corrected, replace the
option ROM peA (if present).