Gestetner B147, Service Manual

Page: 205 / 1081

PROCESS CONTROL ERROR CONDITIONS
SM 4-3 B147/B149/B190
Trouble-
shooting
4.1.2 PROCESS CONTROL SELF-CHECK RESULT
SP3-975-001 (Process Control Self-check Result)
No. Result Description Possible Causes Action
0
Not
performed Process control self-
check is not done. - Do the process control
self-check again.
1
Successfully
completed Process control self-
check successfully
completed. - -
1. Dirty ID sensor (toner,
dust, or foreign material)
1. Clean the ID sensor.
2. Dirty transfer belt 2. Check the belt
cleaning, and clean or
replace the transfer
belt.
3. Scratched or damaged
transfer belt
3. Replace the transfer
belt.
2
ID sensor
adjustment
error Vsg cannot be
adjusted within 4.0
±
0.5V.
4. Defective ID sensor 4. Replace the ID
sensor.
3
Vmin error Vmin is not within
the specified range. 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
4
Sampling
data error Not enough data can
be sampled.
5
Gamma
error Gamma is out of
range.
0.3 > Gamma, or
6.0 < Gamma
6
Vk error Vk is out of range.
-150 > Vk or 150 <
Vk
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. 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. Development unit not
properly installed.
1. Check.
2. Toner density is too low
or high.
2. Check and/or correct
toner density.
7
Vt error Vt is out of range.
0.5 > Vt or 4.8 < Vt
3. TD sensor defective. 3. Replace development
unit.
8
Sampling
data error
during LD
power
correction Not enough data can
be sampled during
the LD power
correction (if "LD
Power" is set in SP3-
125-002). See the possible causes and action for error codes 4,
5, and 6.
9
Forced
termination Process control self-
check was forcibly
terminated. A cover was opened or the
main switch was turned off
during the self-check. Do the process control
self-check again.