CHAPTER 8 TROUBLESHOOTING
8-50
I-3 Jitter
Phenomenon
Uneven optical density appears periodically in the horizontal direction on the printed image as
shown in
Main Causes
(1) Failure of main motor.
i) Irregular rotation of the drive motor.
ii) Failure of the gears.
iii) Variation of OPC belt running speed due to above reasons.
(2) Failure of the OPC belt.
Countermeasures
(1) Replace the main motor with a new one.
(2) Replace the OPC belt cartridge with a new one.
NOTE:
If the print mode is set to CAPT (Color Advanced Photoscale Technology) in the driver, this
problem might occur. Change the mode setting to normal mode.
I-4 Ribbing
Phenomenon
Light print occurs on the right or left hand side of the image as shown in
Page 8-45
.
Main Causes
(1) Slight tilt on the surface of printer
installation table.
(Tilt should be less than 1
°
.)
(2) Toner amount in the toner cartridge
is insufficient.
(3) Toner concentrates to one side in
the toner cartridge since the toner
cartridge is not level.
(4) The spring at the back of the
developer unit is deformed.
1
Fig. 8-6
(5) The front cover unit is not firmly closed.
Countermeasures
(1) Confirm that the printer installation table is flat and level.
(2) Shake the toner cartridge horizontally several times to remedy the concentration.
(3) Replace the toner cartridge with a new one.
(4) Confirm the open/close position of the front cover to be firmly closed.
Summary of Contents for HL-3450CN Series
Page 15: ...HL 3450CN SERVICE MANUAL xiii 3 Rating Label For US For Europe 4 Operation Label 5 Jam Label ...
Page 17: ...HL 3450CN SERVICE MANUAL CHAPTER 1 PRODUCT OUTLINE ...
Page 27: ...HL 3450CN SERVICE MANUAL CHAPTER 2 SPECIFICATIONS ...
Page 39: ...CHAPTER 3 INSTALLATION ...
Page 54: ...HL 3450CN SERVICE MANUAL CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS ...
Page 104: ...HL 3450CN SERVICE MANUAL 4 51 Main PCB Circuit Diagram 1 8 CODE B512137CIR 1 8 LJ8907001 NAME ...
Page 106: ...HL 3450CN SERVICE MANUAL 4 53 Main PCB Circuit Diagram 3 8 CODE B512137CIR 3 8 LJ8907001 NAME ...
Page 108: ...HL 3450CN SERVICE MANUAL 4 55 Main PCB Circuit Diagram 5 8 CODE B512137CIR 5 8 LJ8907001 NAME ...
Page 110: ...HL 3450CN SERVICE MANUAL 4 57 Main PCB Circuit Diagram 7 8 CODE B512137CIR 7 8 LJ8907001 NAME ...
Page 126: ...HL 3450CN SERVICE MANUAL CHAPTER 5 CONTROL PANEL OPERATION ...
Page 173: ...HL 3450CN SERVICE MANUAL CHAPTER 6 PERIODIC MAINTENANCE ...
Page 208: ...CHAPTER 7 DISASSEMBLY RE ASSEMBLY ...
Page 264: ...HL 3450CN SERVICE MANUAL CHAPTER 8 TROUBLESHOOTING ...
Page 310: ...HL 3450CN SERVICE MANUAL 8 47 5 IMAGE FAILURE 1 2 3 4 5 6 7 8 9 a 9 b 10 11 12 13 14 ...
Page 311: ...CHAPTER 8 TROUBLESHOOTING 8 48 15 a 15 b 16 17 18 19 20 21 22 23 24 25 26 27 28 244m m 29 ...