e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C © 2011 - 2015 TOSHIBA TEC CORPORATION All rights reserved
ERROR CODE and TROUBLESHOOTING
8 - 178
[C390] Auto-toner sensor (C) abnormality (upper limit)
[C391] Auto-toner sensor (C) abnormality (lower limit)
[C392] Auto-toner sensor (C) connection error
[C3A0] Auto-toner sensor (M) abnormality (upper limit)
[C3A1] Auto-toner sensor (M) abnormality (lower limit)
[C3A2] Auto-toner sensor (M) connection error
[C3B0] Auto-toner sensor (Y) abnormality (upper limit)
[C3B1] Auto-toner sensor (Y) abnormality (lower limit)
[C3B2] Auto-toner sensor (Y) connection error
[C3C0] Process unit (EPU tray) connection error
Classification Error item
Copy process related service call
Check item Measures
Developer unit mixer motor-K/YMC • Motor check
(Perform the output check: K: 03-114 TMC: 03-115)
EPU tray (process unit) • Connection check (05-2788)
• Connector check
• Harness check
EPU board • Connector check (CN550, CN551, CN553,CN554,
CN555, CN556)
• Board check
LGC board • Connector check (CN308, CN310)
• Board check
Replace parts Remarks
Auto-toner sensor-K/-C/-M/-Y
Developer unit mixer motor-K/YMC
EPU board
LGC board
Classification Error item
Copy process related service call
Check item Measures
EPU tray (process unit) • Connection check (05-2788)
• Connector check
• Harness check
EPU board • Connector check (CN551)
• Board check
LGC board • Connector check (CN308)
• Board check
Replace parts Remarks
EPU board
LGC board
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