Kyocera KM-4230 Service Manual page 459

2A3/4
(19) Image is not square.
Causes
1. Laser scanner unit positioned
incorrectly.
2. Image scanning unit positioned
incorrectly.
(20) Image contrast is low
(carrier scattering).
Causes
1. No developing bias output.
A. Developing bias wire makes poor
contact.
B. Defective main PCB.
C. Defective high-voltage
transformer PCB.
3-6-14
Causes
1. Laser scanner unit positioned incorrectly.
2. Image scanning unit positioned incorrectly.
Check procedures/corrective measures
Adjust the installation position of the laser
scanner unit (see page 3-3-33).
Adjust the installation position of the image
scanning unit (see page 3-3-35).
Causes
1. No developing bias output.
Check procedures/corrective measures
Check the developing bias wire. If there are
any problems, replace it.
Check if CN1-85 on the main PCB goes low
when maintenance item U030 is run. If not,
replace the main PCB.
Check if developing bias is output when there
is no problem with the main PCB while
maintenance item U030 is run. If not, replace
the high-voltage transformer PCB.