Ram Dimm Fault Isolation - Xerox Phaser 4500 Service Manual

RAM DIMM Fault Isolation

Troubleshooting Reference
Applicable Parts
SDRAM DIMM
Image Processor Board
Initial Actions:
Power off printer. Remove and re-install RAM DIMMs after verifying that they
meet the Xerox specifications.
Note
A minimum of 64 MB of RAM must be installed for proper printer operation.
The Phaser 4500 Laser Printer supports PC133 SDRAM in 144-pin SO-DIMM
form. The printer accepts modules of 32, 64, 128, or 256 MB in combinations to
a total of 512 MB.
Troubleshooting Procedures
Step Actions and Questions
1 Power on the printer.
Is RAM ERROR displayed on the Front
Panel?
2 Is POWER ON SELF TEST ERROR
4: MEMORY displayed on the Front
Panel?
3 Is POWER ON SELF TEST ERROR
15: RAM DIMM displayed on the Front
Panel?
4 Print a Startup Page and review the
contents.
Does the Startup Page identify a failed
memory DIMM?
5 Are there two DIMMs installed in the
printer?
6 1. Power off the printer and remove one of
the DIMMs.
2. Power on the printer.
Is a memory fault message displayed?
General Troubleshooting
Wiring and Plug/Jack Map References
None
Yes
Go to Step 5
Go to Step 5
Go to Step 4
Replace the DIMM
and go to step 9
Go to Step 6
Go to Step 8
No
Go to Step 2
Go to Step 3
Problem Solved
Go to Step 5
Go to Step 8
Go to Step 7
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