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                        - Code:                                                                                                                                                                                                                                                                                                               377
- Description:  Vt error [M]
 During the image development, Vt value is less than 0.5V.
- Causes:  • Poor connection (TD sensor outputs is less than 0.5V.) • Defective TD sensor
                        - Code:                                                                                                                                                                                                                                                                                                               380
- Description:  Black development motor error
- Causes:  • Defective motor • Defective BCU
                        - Code:                                                                                                                                                                                                                                                                                                               381
- Description:  Color development motor error
- Causes:  • Defective motor • Defective BCU
                        - Code:                                                                                                                                                                                                                                                                                                               385
- Description:  ID sensor VSG adjustment error
 Vsg is the out of adjustment range during a process control self-check. Adjustment range: 4.0 ± 0.5V
- Causes:  • Defective ID sensor • Dirty ID sensor • ID sensor disconnected • Dirty drum (cleaning incomplete)
                        - Code:                                                                                                                                                                                                                                                                                                               386
- Description:  Development gamma error K
- Causes:  • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem
                        - Code:                                                                                                                                                                                                                                                                                                               387
- Description:  Development gamma error Y
- Causes:  • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem
                        - Code:                                                                                                                                                                                                                                                                                                               388
- Description:  Development gamma error C
- Causes:  • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem
                        - Code:                                                                                                                                                                                                                                                                                                               389
- Description:  Development gamma error M
- Causes:  • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem