Checking The High Voltage Control System - Canon CLC5100 Series Manual

Chapter 2
ANALOG screen. (data A)
BODY ºC...... dataA1
BODY % ...... dataA2
5) Press the Reset key, and turn off the power switch.
6) Remove the environment sensor from the
environment measurement PCB, and insert the
sensor for the environment sensor (TKN 0456) in
its place.
7) Turn on the service switch, and leave it on for 5
min.
8) Start service mode, and select 'DISPLAY'.
9) Check the temperature and humidity on the
ANALOG screen. (data B)
BODY ºC ....... dataB1
BODY % ........ dataB2
10) Compare data A and data B
The difference between data A1 and data B1 is
0 ±5.
The difference between data A and data B is 0
±20.
If the difference is outside the specification, replace
the environment sensor.
11) Press the Reset key, and turn off the power switch.
12) Remove the sensor for the environment sensor
from the environment measurement PCB, and
insert the environment sensor.
13) Install all covers.
The sensor for the environment sensor (TKN
0456) is adjusted with high precision at the factory.
Keep it in a sealed case with a drying agent.
2.7.10 Checking the High
Voltage Control System
CLC5100 / CLC4000
a. Outline
If an image fault occurs, you must first determine
whether the cause is the latent static formation block
which includes the photosensitive drum and the
potential control system or the developing/ transfer
2-30
system.
The machine's high voltage is controlled to a specific
level using the environment sensor and the potential
sensor.
b. Target Contrast Potential
The primary grid bias or the developing bias control
mechanism may be checked by canceling the auto
setting mechanism by the environment sensor for
target contrast potential.
1) Select 'VCONT' of 'ADJ MISC' under 'ADJUST' in
service mode.
2) Select an appropriate value from the target contrast
voltage levels in the following table, and enter it.
0002-0468
3) Execute 'FUNC > EPC' in service mode.
T-2-7
Sensor Environment sensor
Environment Primary grid bias
sensor Transfer blade bias
Separation charging bias
Potential Primary grid bias
sensor Developing bias
T-2-8
Y M
0 Auto Auto
1 390.00 365.00
2 390.00 365.00
3 390.00 365.00
4 370.00 345.00
5 340.00 325.00
6 310.00 295.00
7 295.00 275.00
8 245.00 225.00
C K
Auto Auto
370.00 420.00
370.00 420.00
370.00 420.00
355.00 410.00
335.00 390.00
315.00 380.00
290.00 370.00
225.00 330.00