Gestetner G060 Service Manual page 485

4.1.2 PROCESS CONTROL SELF-CHECK RESULT
SP3-975-1 (Process Control Self-check Result)
No. Result
Not Process control self-
0
performed check is not done.
Successfully Process control self-
1 completed check successfully
completed.
ID sensor Vsg cannot be
adjusted within 4.0 ±
adjustment
error
0.5V.
2
Vmin error Vmin is not within
the specified range.
3
Sampling Not enough data can
4
data error be sampled.
Gamma Gamma is out of
error range.
5
0.3 > Gamma, or
6.0 < Gamma
Vk error Vk is out of range.
-150 > Vk or 150 <
6
Vk
Vt error Vt is out of range.
0.5 > Vt or 4.8 < Vt
7
Sampling Not enough data can
data error be sampled during
during LD the LD power
8
power correction (if SP3-
correction 125-2 is set to "2").
Forced Process control self-
check was forcibly
9 termination
terminated.
SM
PROCESS CONTROL ERROR CONDITIONS
Description Possible Causes
-
-
1. Dirty ID sensor (toner,
dust, or foreign material)
2. Dirty transfer belt
3. Scratched or damaged
transfer belt
4. Defective ID sensor
Vmin is calculated during the self-check. Even when
the calculated Vmin value is out of the specified range,
an optimum value is automatically used instead.
Therefore, this error code does not usually occur.
If no problem is observed with image density and/or
development gamma, nothing needs to be done.
If an image problem such as low image density is
observed, check the following points:
Transfer belt / Belt guide plate / ID sensor
1. ID sensor pattern
density is too high or
low.
2. Residual image on
transfer belt
3. Toner dropped from
development unit
4. Scratched or damaged
transfer belt
1. Development unit not
properly installed.
2. Toner density is too low
or high.
3. TD sensor defective.
See the possible causes and action for error codes 4,
5, and 6.
A cover was opened or the
main switch was turned off
during the self-check.
4-3
Action
Do the process control
self-check again.
-
1. Clean the ID sensor.
2. Check the belt
cleaning, and clean or
replace the transfer
belt.
3. Replace the transfer
belt.
4. Replace the ID sensor.
1. Check the image
development process
and correct toner
density if necessary.
2. Check the transfer belt
cleaning unit.
3. Clean the development
unit and correct toner
density.
4. Replace the transfer
belt.
1. Check.
2. Check and/or correct
toner density.
3. Replace development
unit.
Do the process control
self-check again.
G570