Ricoh FT8680 Service Manual page 373

31 July 1995
SC353 - Vsg Abnormal
Definition:
The main PCB detects a low Vsg value (V) five times in a row.
NOTE: Toner supply shifts to the 7% fixed supply mode. If the Vsg
returns to normal level, standard detect supply resumes. No
service call condition is displayed.
Points to check:
•
ID sensor
•
Erase lamp
•
Drum
•
Developer
SC354 - Vsg Adjustment Error
Definition:
During process control data initialization, the main PCB cannot adjust the ID
sensor output for the Vsg to the standard voltage (4.0 ± 0.2 V).
NOTE: After resetting the system error condition, the toner supply shifts
to 7% fixed supply mode until the next adjustment.
Points to check:
•
ID sensor
•
Drum
•
Main PCB (ID sensor control circuit)
SC390 - Development Motor Overload
Definition:
The motor control PCB cannot maintain the motor speed within the
specification for more than 1.5 seconds. The motor control PCB detects a
large current value (3 A) at the development motor for more than 2 seconds.
Points to check:
•
Mechanical interference with the development motor
•
Development motor and encoder
•
Motor control PCB
•
DC motor drive PCB (Fuse: F3)
SYSTEM ERROR AND SERVICE CALL CONDITIONS
6-11