
IV-5
3.2
Troubleshooting Image Defects
The following procedures should be followed in the event of specific image defects.
See subsection 3.3 for information about the location of the high-voltage contacts and
grounding contacts.
Caution:
Print quality can not be guaranteed in the following cases;
When using the printer for a special job, such as printing of name cards.
When printing much narrower paper than printable paper width.
When printing on one area of the paper continuously even though Letter or A4-size
paper is used.
I-1
Light
Possible cause
Step
Check
Result
Remedy
HV.GND
contacts
(Fig.4-5)
Toner sensing
failure
(printer side)
1
Can printing be started with the
drum unit removed?
Yes
Toner sensor failure.
Check if the toner
sensor needs
cleaning and check
the toner sensor
connection.
Toner sensing
failure
(toner cartridge
side)
2
Is the problem solved when 4
or 5 pages are printed after the
toner cartridge is replaced with
a full one?
Yes
The wiper of the
toner cartridge is
defective.
Replace the toner
cartridge.
Drum
connection
failure
3
Are all the contacts (HV, GND)
connected when the drum unit
is installed?
No
Clean contact
electrodes both in the
printer body and on
the drum unit.
➀
High-voltage
power supply
PCB failure
4
Check the harness connection
between the high-voltage
power supply PCB and the
panel sensor PCB.
No
If the connection is
normal, replace the
high-voltage power
supply PCB.
Panel sensor
PCB or main
PCB failure
5
Perform the same check as
step 4 above and also between
the panel sensor PCB and the
main PCB.
No
Replace the panel
sensor PCB or the
main PCB.
Scanner unit
failure
6
Is the problem solved by
replacing the scanner unit?
Yes
Replace the scanner
unit.
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 ...