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January 2000 © TOSHIBA TEC 4 - 65 FC-22 TROUBLESHOOTING
Cause/Defect area
Step
Check items Measures
High-voltage transformer
(transfer roller/
developer bias)
Process unit (EPU)/
developer unit set position
Developer drive system
Developer material
Developer pole position
Doctor blade position
Drum
Harness for SCM, SIC, IMC
and LGC boards
1 High-voltage transformer output defective?
2 Process unit (EPU) or developer unit in-
stallation defective?
3 Developer sleeve and mixer rotate?
4 Developer material properly transported?
5 Magnetic brush phase error?
6 Doctor sleeve gap incorrect?
7 Drum rotating?
8 Connectors securely connected?
Any open-circuited harness between
boards?
Adjust output and correct circuit, or replace defec-
tive transformer.
Check/correct developer sleeve coupling engaging.
Check EPU sliding mechanism.
Check/correct developer drive system.
Remove foreign matter from developer material, if
any.
Adjust developer pole position.
Adjust gap with doctor-sleeve jig.
Check that drum shaft is inserted.
Check drum drive system.
Re-connect connectors securely.
Replace harness.
(9) Blank copy
Feeding direction