Ricoh D131 Service Manual page 479

SC200: Exposure
FGATE OFF Error: K
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SC231 D
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See SC 230 for troubleshooting details.
LD error
The BICU detects LDB error a few times consecutively when LDB unit
turns on after LDB initialization.
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SC240 C
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GAVD communication error
A problem occurred in the GAVD or eSOC.
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SC270 D
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D131/D132/D133
The PFGATE ON signal still asserts within 5 seconds after
processing the image in normal job or MUSIC for end position [K].
The PFGATE ON signal still asserts when the next job starts.
Worn-out LD
Disconnected or broken harness of the LD
Replace the harness of the LD.
Replace the laser optics housing unit.
Replace the BICU.
Check connection points on the BCU, IPU for loose, broken, or
defective harness or connector
IPU defective
BCU defective
LDU effective
2-12 SM Appendix