Utax CD 1015 Servisní příručka Strana 175

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Zobrazit stránku 174
2AV/X
1-5-24
1-5
(19)Image is not
square.
Causes
1. Laser scanner unit positioned incorrectly.
2. Image scanning unit positioned incorrectly.
Causes Check procedures/corrective measures
1. Laser scanner unit positioned incorrectly.
2. Image scanning unit positioned incorrectly.
(20)Image contrast is
low (carrier scatter-
ing).
Causes
1. No developing bias output.
Causes Check procedures/corrective measures
1. No developing bias output.
A. Developing bias wire makes poor contact.
B. Defective main PCB.
C. Defective high-voltage transformer PCB.
Adjust the installation position of the laser scanner unit
(see page 1-6-26).
Adjust the installation position of the image scanning unit
(see page 1-6-30).
Check the developing bias wire. If there are any problems, replace it.
Check if CN4-4 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.
Zobrazit stránku 174
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