CHAPTER 6 TROUBLESHOOTING
6-32
M-8
Scanner failure
Possible cause
Step
Check
Result
Remedy
Harness
connection
failure
1
Is the connection of the
scanner motor connector P12
on the engine PCB secure?
No
Reconnect the connector
securely.
Power supply
input
2
Is the voltage between pins 1
(+24V DC) and 2 (GND) of
connector P12 on the engine
PCB 24V DC?
No
Check if +24V DC is supplied
between pins 2 (+24V DC)
and 3 (+24V RET) of
connector P5 on the engine
PCB. If not, check the power
supply output on the low-
voltage power supply PCB.
Yes
Replace the laser unit.
M-9
Fuser failure
Possible cause
Step
Check
Result
Remedy
Poor thermistor
harness contact
1
Is the contact of connector P6
on the engine PCB good?
No
Reconnect the connector.
Blown thermal
fuse
2
Remove the fixing unit and
measure the resistance
between the input connectors.
Is it open circuit?
Yes
Replace the fixing unit.
Thermistor
failure
3
Is the thermistor installed
properly?
Yes
Replace the fixing unit.
No
Reinstall the thermistor
properly.
Halogen heater
lamp failure
4
Remove the fixing unit and
measure the resistance of the
halogen heater lamp. Is it
open circuit?
Yes
Replace the halogen heater
lamp.
Heater harness
connection
failure
5
Is the heater harness
connector connected to the
low-voltage power supply PCB
and fixing unit secure?
No
Reconnect the connectors
securely.
NOTE:
•
This problem will be cleared if leaving the printer power ON for ten minutes.
•
If the heater is cooled down sufficiently, this problem may be cleared by pressing the
Go
switch and
Set
switch together till the back light turns green and turning off the power
switch.
Be warned, however, that this operation will melt the fixing unit if the heater
is hot.
Содержание HL-1870N
Страница 15: ...HL 1850 1870N SERVICE MANUAL xiii ...
Страница 77: ...CHAPTER 2 INSTALLATION AND BASIC OPERATION 2 48 ...
Страница 82: ...HL 1850 1870N SERVICE MANUAL 3 5 Fig 3 5 ...
Страница 83: ...CHAPTER 3 THEORY OF OPERATION 3 6 1 3 2 ROM Two 64 Mbits ROMs x 16 bit are fitted Fig 3 6 HL 1850 HL 1870N ...
Страница 85: ...CHAPTER 3 THEORY OF OPERATION 3 8 1 3 4 SDRAM A 64M bit SDRAM x 32 bits is used as the RAM Fig 3 8 HL 1850 ...
Страница 86: ...HL 1850 1870N SERVICE MANUAL 3 9 Two 64M bit SDRAMs x 16 bits are used as the RAM Fig 3 9 HL 1870N ...
Страница 91: ...CHAPTER 3 THEORY OF OPERATION 3 14 Fig 3 15 ...
Страница 101: ...CHAPTER 3 THEORY OF OPERATION 3 24 ...
Страница 109: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 2 ...
Страница 131: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 24 Fig 4 39 ...
Страница 141: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 34 Never touch the surface of the heat roller ...
Страница 148: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 41 ...
Страница 158: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 51 Fig 4 80 ...
Страница 160: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 53 Fig 4 82 ...
Страница 167: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 60 Fig 4 91 ...
Страница 169: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 62 Fig 4 93 ...
Страница 172: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 65 Fig 4 97 ...
Страница 174: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 67 3 27 Harness Winding Form ...
Страница 183: ...CHAPTER 5 PERIODIC MAINTENANCE 5 8 ...
Страница 186: ...HL 1850 1870N SERVICE MANUAL 5 11 ...
Страница 194: ...CHAPTER 6 TROUBLESHOOTING 6 8 error in this chapter ...
Страница 202: ...CHAPTER 6 TROUBLESHOOTING 6 16 ...
Страница 205: ...HL 1850 1870N SERVICE MANUAL 6 19 ...
Страница 210: ...CHAPTER 6 TROUBLESHOOTING 6 24 ...
Страница 237: ...HL 1850 1870N SERVICE MANUAL 6 51 No Refer and compare with I 15 ...
Страница 255: ...HL 1850 1870N SERVICE MANUAL 6 69 ...
Страница 261: ...CHAPTER 7 HIDDEN FUNCTIONS 7 6 DRAM CHECK START START DRAM TEST Tests DRAM data ...
Страница 270: ...HL 1850 1870N SERVICE MANUAL 7 15 ...
Страница 271: ......
Страница 272: ...Appendix 1 Connection Diagram HL 1850 1870N A 1 ...
Страница 273: ...Appendix 2 Main PCB Circuit Diagram HL 1850 1870N 1 6 CODE LJ8453001 B512078CIR 1 6 A 2 NAME ...
Страница 274: ...Appendix 3 Main PCB Circuit Diagram HL 1850 1870N 2 6 CODE LJ8453001 B512078CIR 2 6 A 3 NAME ...
Страница 275: ...Appendix 4 Main PCB Circuit Diagram HL 1850 1870N 3 6 CODE LJ8453001 B512078CIR 3 6 A 4 NAME ...
Страница 276: ...Appendix 5 Main PCB Circuit Diagram HL 1850 1870N 4 6 CODE LJ8453001 B512078CIR 4 6 A 5 NAME ...
Страница 277: ...Appendix 6 Main PCB Circuit Diagram HL 1850 1870N 5 6 CODE LJ8453001 B512078CIR 5 6 A 6 NAME ...
Страница 278: ...Appendix 7 Main PCB Circuit Diagram HL 1850 1870N 6 6 CODE LJ8453001 B512078CIR 6 6 A 7 NAME ...
Страница 281: ...Appendix 10 Network Board PCB Circuit Diagram HL 1850 1870N CODE LJ8439001 A 10 NAME B512058CIR ...
Страница 282: ...Appendix 11 Low voltage Power Supply PCB Circuit Diagram 100V A 11 NAME Low voltage PS Circuit 100V ...
Страница 283: ...Appendix 12 Low voltage Power Supply PCB Circuit Diagram 200V A 12 NAME Low voltage PS Circuit 200V ...
Страница 284: ...Appendix 13 High voltage Power Supply PCB Circuit Diagram A 13 NAME High voltage PS Circuit ...
Страница 303: ...APPENDIX A 32 ...