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不知道楼主能否看懂？

045-360 Cont IF Error Y Fail
Bsd-on:CH6.9

The MCU PWB detected an error with the image sync signal from the External ESS (DFE) to the IOT. (Y)

The detection function works only during a print job from the External ESS (DFE), so turning OFF then ON the IOT will clear this Fail. However, if a print job is run again from the External ESS (DFE), this fault may sometimes reoccur. The image sync signal is routed from External ESS (DFE) to VSEL PWB to BP PWB to MCU PWB.

Procedure
Check if the cable is properly connected between the External ESS (DFE) and the VSEL PWB. If it is good, replace the following parts in order:

Cable between External ESS (DFE) and VSEL PWB

I/F PWB on the part of External ESS (DFE)

VSEL PWB (PL 35.2)