IV-10
I-6
Black vertical streaks
Black and blurred vertical streaks
Possible cause
Step
Check
Result
Remedy
HV.GND
contacts
(Fig.4-5)
Corona failure
1
Is the corona wire dirty?
Yes
Clean the corona
wire with the wire
cleaner.
➇
Corona failure
2
Is the vertical block streak
about 10mm wide?
Is the corona wire cleaner not
in its home position?
Yes
Return the wire
cleaner to its home
position.
Dirt in the paper
feed system
3
Is the paper tray or feed
system on the drum unit soiled
with toner?
Yes
Clean the toner off.
Scratch on the
drum
4
Is the drum surface scratched?
Yes
Replace the drum
unit.
Cleaning failure
5
Is the drum surface dirty with
toner in streaks?
Yes
Replace the drum
unit.
Scratch on the
heat roller
6
Is the surface of the heat roller
scratched?
Yes
Replace the fixing
unit.
Note:
Is you print the same pattern continuously, the drum will be worn away and
black vertical streaks appear on the paper.
I-7
Black and blurred horizontal stripes
Possible cause
Step
Check
Result
Remedy
Scratch on the
drum
1
Are the horizontal stripes at
94mm (OPC drum) intervals?
Yes
Replace the drum unit.
Toner stuck on
the developer
roller
2
Are the horizontal stripes at
25mm (developer roller)
intervals?
Yes
Print several sheet and see
what happens.
The problem will disappear
after a while. If not, replace the
drum unit.
Scratch on the
fixing roller
3
Are the horizontal streaks at
63mm (heat roller) intervals?
Yes
Replace the fixing unit.
SR PCB
4
Is the problem solved after the
SR PCB replaced?
Yes
Replace the SR PCB.
Summary of Contents for HL-1070 - B/W Laser Printer
Page 1: ......
Page 20: ...II 4 Fig 2 4 ...
Page 24: ...II 8 1 3 5 DRAM Four 16Mbit DRAM x 16bit are used as the printer memory Fig 2 7 ...
Page 28: ...II 12 1 3 11 Engine I O Fig 2 14 and 2 15 show the engine interface circuit Fig 2 13 ...
Page 29: ...II 13 Fig 2 14 ...
Page 64: ...III 24 4 PACKING Fig 3 39 Documents Accessories Carton Pad Pad PE sheet Bag Pad Pad Carton ...
Page 96: ...CODE UK3958 000 B48K302 1CIR NAME A 3 Appendix 3 Main PCB Circuit Diagram 1 5 ...
Page 97: ...CODE UK3958 000 B48K302 1CIR NAME A 4 Appendix 4 Main PCB Circuit Diagram 2 5 ...
Page 98: ...CODE UK3958 000 B48K302 1CIR NAME A 5 Appendix 5 Main PCB Circuit Diagram 3 5 ...
Page 99: ...CODE UK3958 000 B48K302 1CIR NAME A 6 Appendix 6 Main PCB Circuit Diagram 4 5 ...
Page 100: ...Appendix 7 Main PCB Circuit Diagram 5 5 CODE UK3958 000 B48K302 1CIR NAME A 7 ...
Page 101: ...Appendix 8 Driver PCB Circuit Diagram CODE UK3634000 B48K280CIR NAME A 8 ...
Page 106: ...Appendix 13 SR PCB Circuit Diagram CODE UK3653000 B48K284CIR NAME A 13 ...
Page 107: ...Apr 98 54U011BE0 PARTS REFERENCE LIST MODEL HL 1070 R LASER PRINTER ...
Page 241: ...APPENDIX A 11 HP LaserJet 6P EPSON FX 850 IBM Proprinter XL EPSON FX 850 PC 850 ...