Service manual

SC TABLE 30 July, 2001
4-14
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
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 CN214-5) to
the BCU.
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.
SC 385 ID sensor VSG
adjustment
error
Vsg is the out of adjustment
range during a process control
self-check.
Adjustment range:
4.0 ± 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.
SC 386
Development
gamma error K
SC 387
Development
gamma error Y
SC 388 Development
gamma error
C
SC 389 Development
gamma error
M
Any of the following conditions
happens three consecutive
times:
• When the development
gamma is out of the
following range:
0.3 ≤ γ ≥ 6.0
• When Vk is out of the
following range:
-150V ≤ Vk ≥ 150V
• Development gamma
calculation error
• Unsuitable toner
density
• Toner supply
mechanism problem
• Laser exposure
problem
• Image transfer
problem
1. Turn the main switch off and on .
2. Check the process control self-check
result (SP3-975). If the result is not
“1”, fix the problem according to the
table in section 4.1.2.
3. Print a full color image by disabling
SC detection (SP5-809-001) and
check if the image quality is OK. If the
image quality is not OK, fix the
problem. Then, enable the SC
detection again.