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February 2002 © TOSHIBA TEC 4 - 75 FC-210/310 TROUBLESHOOTING
Cause/Section
Step
Check items Measures
High-voltage transformer
(transfer roller/
developer bias)
Processing unit (EPU)/
developer unit set position
Developer drive system
Developer material
Developer pole position
Doctor blade position
Drum
Harnesses for SCM,
SYS, IMG, IMC and LGC
boards
1 Is the high-voltage transformer output
defective?
2 Is the processing unit (EPU) or the
developer unit installed securely?
3 Do the developer sleeve and mixer rotate?
4 Is developer material properly
transported?
5 Is there any magnetic brush phase error?
6 Is the doctor sleeve gap incorrect?
7 Is the drum rotating?
8 Are the connectors securely connected?
Is any harness between the boards
open-circuited?
Adjust the output and correct the circuit, or
replace the transformer.
Check/correct the developer sleeve coupling
engaging. Check the EPU sliding mechanism.
Check/correct the developer drive system.
Remove foreign matter from developer
material, if any.
Check the developer pole position.
Adjust the gap with the doctor-sleeve jig.
Check that the drum shaft is inserted.
Check the drum drive system.
Re-connect the connectors securely.
Replace the harness.
(9) Blank copy
Feeding direction