3-64 Xerox Internal Use Only Phaser 6500/WorkCentre 6505 Service Manual
Error Messages and Codes
MCU-ESS Communication Fail
Applicable Error Code
• 024-371
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack Map References
■ IP Board (ESS) (SFP PL8.1.7; MFP
PL8.1.2)
■ MCU Board (SFP PL8.2.13; MFP
PL8.3.6)
■ IP Board (ESS) Harness Assy
(PL9.1.1)
■ “Map 3 - SFP IP Board, LVPS, and Drive”
on page 10-8
■ “Map 4 - SFP MCU Board” on
page 10-9
■ “Map 9 - MFP MCU Board and HVPS”
on page 10-18
■ “Map 8 - MFP LVPS, IP Board, and
Drive” on page 10-17
■ “SFP System Control” on page 10-34
■ “MFP System Control” on page 10-47
Troubleshooting Procedure
Step Actions and Questions Yes No
1 Check after resetting the IP Board and
MCU Board.
Reseat the IP Board and MCU Board.
Does the error still occur when the
power is turned Off and On?
Go to step 2. Complete.
2 Check the connections between the
MCU Board and IP Board.
Are P/J10 and SFP P/J101 or
MFP P/J2001properly connected?
Go to step 4. Reconnect the
connector(s)
P/J10 and/or
P/J101 or
P/J2001, then
go to step 3.
3 Does the error still occur when the
power is turned Off and On?
Go to step 4. Complete.
4 Check the IP Board Harness Assy for
continuity.
Disconnect J10 from the MCU Board.
Disconnect J101 from the SFP IP
Board or J2001 from the MFP IP
Board.
Is each wire in the harness
continuous?
Go to step 5. Replace the IP
Board Harness
Assy.
5Check the firmware version
Is the firmware the latest version?
Go to step 6. Update the
firmware
(“Firmware
Update” on
page A-16).
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