京瓷彩色激光打印机故障代码7403
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Call Service 7403 7004-7403 codes Upgrading the firmware
7403 Developing unit M non-
installing error
No density detection signal is
output from toner sensor M in
developing unit M
Reinsert the connector. Also check for conti-
tor cable or poor
nuity within the connector cable. If none,
contact in the con-
replace the cable.
nector.
Developing unit M and Drum relay PWB
(YC7)
Drum relay PWB (YC1) and engine PWB
(YC34)
Defective toner
Replace the developing unit M (see page 1-
sensor M.
5-18).
Defective engine
Replace the engine PWB and check for cor-
PWB.
rect operation (see page 1-5-26).京瓷彩色激光打印机故障代码7403
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