IV-6
I-2
Dark
Possible cause
Step
Check
Result
Remedy
HV.GND
contacts
(Fig.4-5)
Density dial
1
Is the density dial at the center
click position?
No
Set it to the center
click position or
reasonable position.
Corona failure
(soiled wire)
2
Is the corona wire dirty?
Yes
Clean the corona wire
by using the wire
cleaner.
➇
Corona failure
(contact failure)
3
Are the corona electrodes
between the printer body and
drum unit dirty?
No
Clean both electrodes.
➅
Drum unit failure
4
Is the problem solved when the
drum unit is replaced?
Yes
Replace the drum
unit with a new one.
H.V. power
supply PCB
5
Are there any disconnected
connectors?
No
Replace the H.V.
power supply.
Main PCB
6
Are there any disconnected
connectors?
No
Replace the main
PCB.
Driver PCB
7
Are there any disconnected
connectors?
No
Replace the driver
PCB.
Download Free Service Manual and Resetter Printer at http://printer1.blogspot.com
Summary of Contents for HL-1070
Page 1: ...Download Free Service Manual and Resetter Printer at http printer1 blogspot com ...
Page 20: ...II 4 Fig 2 4 Download Free Service Manual and Resetter Printer at http printer1 blogspot com ...
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 ...