Brother HL-3450CN Service Manual page 318

I-11 Vertically Staggered Image
Phenomenon
Printed image staggered in the vertical direction as shown in
Main Causes
(1) Shock or vibration applied to the printer.
(2) Failure of the laser unit; vibration from rotation of the scanner motor.
Countermeasures
(1) Do not apply shock or vibration to the printer body.
(2) Installation location should be appropriate with no possibility of shock or vibration.
(3) Replace the laser unit with a new one. (See
I-12 Banding
Phenomenon
Banding line appears in the horizontal direction as shown in
Main Causes
This is a transfer failure due to the shock caused when the OPC belt seam passes over the
cleaning blade.
Countermeasures
Replace the OPC belt cartridge with a new one. (See
Section 4.5.3 of Chapter
Belt seam
Fig. 8-11
8-55
HL-3450CN SERVICE MANUAL
print sample (11) of Page
7.)
print sample (12) of Page
Section 4.1 of Chapter 6.)
8-45.
8-45.