
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.
Содержание HL-1020
Страница 1: ......
Страница 36: ...II 20 Fig 2 22 shows the CDCC interface circuit Fig 2 22 HL 1050 ...
Страница 37: ...II 21 1 3 10 Engine I O Fig 2 23 shows the engine interface circuit Fig 2 23 HL 820 1020 1040 ...
Страница 38: ...II 22 Fig 2 24 shows the engine interface circuit Fig 2 24 HL 1050 ...
Страница 67: ...III 18 4 PACKING Fig 3 32 Documents Accessory carton Pad Pad Printer Bag Carton ...
Страница 87: ...IV 20 3 4 Location of Feed Roller Shaft and Grounding Contacts Fig 4 7 Feed shaft roller For feed roller ...
Страница 101: ...CODE UK4007000 B48K312CIR NAME V 5 Appendix 5 Main PCB Circuit Diagram HL 820 1020 1040 1 2 ...
Страница 102: ...Appendix 6 Main PCB Circuit Diagram HL 820 1020 1040 2 2 CODE UK4007000 B48K312CIR NAME A 6 ...
Страница 103: ...Appendix 7 Main PCB Circuit Diagram HL 1050 1 5 CODE UK4041000 B512001CIR NAME A 7 ...
Страница 104: ...Appendix 8 Main PCB Circuit Diagram HL 1050 2 5 CODE UK4041000 B512001CIR NAME A 8 ...
Страница 105: ...Appendix 9 Main PCB Circuit Diagram HL 1050 3 5 CODE UK4041000 B512001CIR NAME A 9 ...
Страница 106: ...Appendix 10 Main PCB Circuit Diagram HL 1050 4 5 CODE UK4041000 B512001CIR NAME A 10 ...
Страница 107: ...Appendix 11 Main PCB Circuit Diagram HL 1050 5 5 CODE UK4041000 B512001CIR NAME A 11 ...
Страница 108: ...Appendix 12 Panel Sensor PCB Circuit Diagram CODE UK4010000 B48K303CIR NAME A 12 ...
Страница 117: ...Apr 98 84U005BE0 PARTS REFERENCE LIST MODEL HL 820 1020 1040 1050 R LASER PRINTER ...
Страница 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 ...
Страница 133: ...R Lower Tray Unit for HL 2400C Color Laser Printer PARTS REFERENCE LIST MODEL LT 24CL Feb 1999 54S003BE0 ...
Страница 135: ...CONTENTS LOWER TRAY UNIT List 1 Drawing 2 ...
Страница 137: ... 2 GENERAL DRAWING MODEL LT 24CL 54S X06 4 3 1 6 5 2 7 ...
Страница 138: ...R Lower Tray Unit for HL 2400C Color Laser Printer SERVICE MANUAL MODEL LT 24CL Feb 1999 54S004BE0 ...
Страница 214: ......
Страница 296: ...USER S GUIDE A 12 HP LaserJet IIP 6P EPSON FX 850 IBM Propritner XL EPSON FX 850 ...