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I-11
Poor fixing
Possible cause
Step
Check
Result
Remedy
Printing paper
1
Is thick paper more than 36 lb.
being used?
Yes
Instruct the user to
use paper of the
recommended
thickness.
Toner sensing
failure
2
Is the problem solved by replacing
the drum unit or the toner cartridge?
(When printing is faint.)
Yes
Toner is empty.
As toner sensing is
defective, clean the
toner sensor.
If the wiper of the
toner cartridge id
broken, replace the
toner cartridge with a
new one.
Fixing unit nip
failure
3
Is the nip width in the fixing unit
insufficient?
Is the nip spring (P/R spring)
unconnected?
Yes
Connect the spring
or replace the fixing
unit.
Thermistor
failure
4
Measure the temperature of heat
roller surface during printing.
Is the temperature correct (160°C)?
No
Replace the fixing
unit.
Содержание HL-720
Страница 1: ...SERVICE MANUAL MODEL HL 720 730 730Plus R LASER PRINTER ...
Страница 36: ...II 19 1 3 10 Engine I O HL 720 Fig 2 21 shows the engine interface circuit Fig 2 21 ...
Страница 37: ...II 20 HL 730 730Plus Fig 2 22 shows the engine interface circuit Fig 2 22 ...
Страница 61: ... Fig 3 18 2 4 1 1 1 ...
Страница 92: ...SERVICE MANUAL MODEL HL 760 R LASER PRINTER ...
Страница 109: ...II 8 1 3 4 DRAM Two 4M bit DRAMs x 16bits are used as the RAM Fig 2 6 ...
Страница 113: ...II 12 1 3 10 Engine I O Fig 2 12 shows the engine interface circuit Fig 2 12 ...
Страница 114: ...II 13 1 3 11 Paper Feed Motor Drive Circuit Fig 2 13 ...
Страница 133: ...Appendix 2 Main PCB Circuit Diagram 1 3 CODE UK3227000 B48K272CIR 1 3 NAME ...
Страница 134: ...Appendix 3 Main PCB Circuit Diagram 2 3 CODE UK3227000 B48K272CIR 2 3 NAME ...
Страница 135: ...CODE UK3227000 B48K272CIR 3 3 NAME Appendix 4 Main PCB Circuit Diagram 3 3 ...