Dc Power Supply Troubleshooting; Ram Memory Fault Isolation - Xerox Phaser 7400 Service Manual

DC Power Supply Troubleshooting

Troubleshooting Reference Table
Applicable Parts
LVPS, PL3.1.4
Troubleshooting Procedure Table
Step Action and Questions
1
Perform the AC power supply
troubleshooting procedure.
Does the problem persist?
2
Check for +24 V at CN2.
Is there +24 V at CN2-1 <=> ground?

RAM Memory Fault Isolation

Image Processor Board RAM memory has failed or is not installed. A minimum of
256 MB of RAM must be installed for proper printer operation. The Phaser 7400
Color Printer supports DDR PC2700 in 200-pin SODIMM form. The printer accepts
modules of 256 or 512 MB in combinations up to the maximum of 1 GB.
Errors appearing on the Startup page:
Hardware Failure: RAM Memory Slot 1 Checksum
Hardware Failure: RAM Memory Slot 2 Checksum
Hardware Failure: RAM Memory Slot 1 Rejected
Hardware Failure: RAM Memory Slot 2 Rejected
Errors appearing on the Control Panel:
Power On Self Test Error 15: RAM DIMM
Power On Self Test Error 16: Minimum RAM Limit
Power On Self Test Error RAM ERROR
Initial Actions:
Check that the RAM devices are making positive contact with their connectors.
1.
Power off the printer.
2.
Remove and re-install the RAM memory after verifying it meets the Xerox
specifications. See "Memory Specifications" on page 1-13. If the problem
persists, use the following procedure to correct it
General Troubleshooting
Wiring and Plug/Jack References
Print Engine LVPS (page 10-39)
Yes
Go to Step 2.
Replace the
affected harness..
No
Complete.
Replace the LVPS
(page 8-121).
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