Service manual

SC TABLE
SM 4-15 G130/G131
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 374 Vt error [K]
SC 375 Vt error [Y]
SC 376 Vt error [C]
SC 377 Vt error [M]
During the image development,
Vt value is less than 0.78V.
• Poor connection (TD
sensor outputs is less
than 0.5V.)
• Defective TD sensor
1. Turn the main switch off and on.
2. Reset the related color development
unit.
3. Replace the related color
development unit.
D
SC 380 Black
development
motor error
SC 381 Color
development
motor error
When the motor speed is within
the target level, the motor
sends a lock signal (High to
Low at CN608-5 [Black]/
CN609-5 [Color]) to the DRB.
SC380 is detected under the
following conditions:
• The Lock signal stays High 2
seconds after the motor
turns on.
• The Lock signal stays Low 2
seconds after the motor
turns off.
• The Lock signal stays High
for more than 2 seconds
while the motor is on.
• Defective motor
• Defective BCU
1. Turn the main switch off and on.
2. Replace the motor.
3. Replace the BCU.
D
SC 385 ID sensor VSG
adjustment
error
Vsg is the out of adjustment
range during a process control
self-check.
Adjustment range:
± 0.5V
• Defective ID sensor
• Dirty ID sensor
• ID sensor
disconnected
• Dirty drum (cleaning
incomplete)
1. Turn the main switch off and on.
2. Clean the ID sensor and adjacent
parts.
3. Check the drum cleaning condition.
4. Check the ID sensor connector.
5. Replace the ID sensor.
D