IV-10
I-6
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:
If you print the same pattern continuously, the drum will be worn and black vertical
streaks will 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.
High-voltage
power supply
PCB
4
Is the problem solved after the
high-voltage power supply
PCB is replaced?
Yes
Replace the high-voltage
power supply PCB.
Summary of Contents for HL-1020
Page 1: ......
Page 36: ...II 20 Fig 2 22 shows the CDCC interface circuit Fig 2 22 HL 1050 ...
Page 37: ...II 21 1 3 10 Engine I O Fig 2 23 shows the engine interface circuit Fig 2 23 HL 820 1020 1040 ...
Page 38: ...II 22 Fig 2 24 shows the engine interface circuit Fig 2 24 HL 1050 ...
Page 67: ...III 18 4 PACKING Fig 3 32 Documents Accessory carton Pad Pad Printer Bag Carton ...
Page 101: ...CODE UK4007000 B48K312CIR NAME V 5 Appendix 5 Main PCB Circuit Diagram HL 820 1020 1040 1 2 ...
Page 102: ...Appendix 6 Main PCB Circuit Diagram HL 820 1020 1040 2 2 CODE UK4007000 B48K312CIR NAME A 6 ...
Page 103: ...Appendix 7 Main PCB Circuit Diagram HL 1050 1 5 CODE UK4041000 B512001CIR NAME A 7 ...
Page 104: ...Appendix 8 Main PCB Circuit Diagram HL 1050 2 5 CODE UK4041000 B512001CIR NAME A 8 ...
Page 105: ...Appendix 9 Main PCB Circuit Diagram HL 1050 3 5 CODE UK4041000 B512001CIR NAME A 9 ...
Page 106: ...Appendix 10 Main PCB Circuit Diagram HL 1050 4 5 CODE UK4041000 B512001CIR NAME A 10 ...
Page 107: ...Appendix 11 Main PCB Circuit Diagram HL 1050 5 5 CODE UK4041000 B512001CIR NAME A 11 ...
Page 108: ...Appendix 12 Panel Sensor PCB Circuit Diagram CODE UK4010000 B48K303CIR NAME A 12 ...
Page 117: ...Apr 98 84U005BE0 PARTS REFERENCE LIST MODEL HL 820 1020 1040 1050 R LASER PRINTER ...
Page 122: ...1 1 1 MODEL HL 1050 84U 861 101 103 104 84U 862 106 6 4 5 MAIN PCB HL 1050 OTHERS ISRAEL 3 ...
Page 135: ...CONTENTS LOWER TRAY UNIT List 1 Drawing 2 ...
Page 137: ... 2 GENERAL DRAWING MODEL LT 24CL 54S X06 4 3 1 6 5 2 7 ...
Page 214: ......
Page 296: ...USER S GUIDE A 12 HP LaserJet IIP 6P EPSON FX 850 IBM Propritner XL EPSON FX 850 ...