Dfe/Ess Communication Failure 12 - Xerox DocuColor 2240 Service Manual

16-382 DFE/ESS Communication Failure 12

NAK-generated message length error.
Procedure
Switch the power off, then on. If the problem continues, check the connections at the MCU
PWB and the I/F PWB. Check that the DDI cables from the Network Controller (NC) to the IOT
are secured and are free from damage. Reinstall system software.
If this does not resolve the problem, perform the following checks in the sequence presented,
until the problem is resolved:
• Ensure that a live network cable is connected to the NC. Verify that the AC power connec-
tor is connected to the NC and that AC line voltage is present. If the voltage is not present,
go to the OF 1-4 RAP.
• Verify that the NC is functioning correctly. Refer to the NC service documentation.
• Switch the DDI cables from the NC to the IOT (switch both ends). If the problem changes,
replace the cables.
• Replace the VSEL PWB (PL 13.1).
• Replace the ESS PWB (PL 13.1).
• Replace the MCU PWB (PL 13.1).
If the problem persists, replace the Network Controller.
Status Indicator RAPs
16-382, 16-383
16-383 DFE/ESS Communication Failure 13
NAK-generated checksum error.
Procedure
Switch the power off, then on. If the problem continues, check the connections at the MCU
PWB and the I/F PWB. Check that the DDI cables from the Network Controller (NC) to the IOT
are secured and are free from damage. Reinstall system software.
If this does not resolve the problem, perform the following checks in the sequence presented,
until the problem is resolved:
• Ensure that a live network cable is connected to the NC. Verify that the AC power connec-
tor is connected to the NC and that AC line voltage is present. If the voltage is not present,
go to the OF 1-4 RAP.
• Verify that the NC is functioning correctly. Refer to the NC service documentation.
• Switch the DDI cables from the NC to the IOT (switch both ends). If the problem changes,
replace the cables.
• Replace the VSEL PWB (PL 13.1).
• Replace the ESS PWB (PL 13.1).
• Replace the MCU PWB (PL 13.1).
If the problem persists, replace the Network Controller.
02/03
2-334
Initial issue
DC 3535/2240/1632