• Code: C370
• Description: Transfer belt operation abnormality
• Causes: Transfer belt contact/release detection sensor Transfer belt motor DRV board LGC board
• Remedy: DRV board • Connector check (CN536, CN541) • Harness check • Board check Transfer belt unit • Connector check • Unit check Transfer belt motor (M13) • Motor check (Perform the output check: 03-116) • Connector check • Harness check Transfer belt contact/release detection sensor (S46) • Sensor check (Perform the input check: 03-[ALL]OFF/[5]/[H]) • Connector check • Harness check LGC board • Connector check (CN311) • Board check

• Code: C380
• Description: Auto-toner sensor-K abnormality (upper limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: 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

• Code: C381
• Description: Auto-toner sensor-K abnormality (lower limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: 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

• Code: C382
• Description: Auto-toner sensor-K connection error
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: 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

• Code: C390
• Description: Auto-toner sensor-C abnormality (upper limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: 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

• Code: C391
• Description: Auto-toner sensor-C abnormality (lower limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: 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

• Code: C392
• Description: Auto-toner sensor-C connection error
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: 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

• Code: C3A0
• Description: Auto-toner sensor-M abnormality (upper limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: 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