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Confidential
9-6
Error Code
(Hex)
Symptom Probable
Cause
Solution
28
Charge HV unit error
HV Power Supply
defective
Replace the HV Power
Supply PCB
29
LVPS error.
LV Power Supply
defective
Replace the LV Power
Supply PCB
Fuser
thermistor
defective
Replace the fuser unit
2A
Fuser thermistor error
Engine controller board
defective
Replace the engine
controller board.
Breakdown of Heater
On/Off Circuit
Replace the LV Power
Supply PCB
2B
Fuser heater error.
Breakdown of Temp
Control Circuit
Replace the engine
controller board
Contact Failure of
Harness Connector
Confirm the connection of
Harness Connector
2C
Fuser temperature low error at
warming-up.
Low Input Voltage
Connect the printer with
the rated voltage
source.
2D
Fuser temperature low error
Low Input Voltage
Connect the printer with
the rated voltage
source.
Breakdown of Heater
On/Off Circuit
Replace the LV Power
Supply PCB
2E
Fuser temperature high error
Breakdown of Temp
Control Circuit
Replace the engine
controller board
Breakdown of Heater
On/Off Circuit
Replace the LV Power
Supply PCB
2F
Fuser ACOFF error.
Breakdown of Temp
Control Circuit
Replace the engine
controller board
Erase lamp defective
Replace the erase lamp
30
Erase LED error
Engine controller board
defective
Replace the engine
controller board.
Power supply fan
defective
Replace the power supply
fan
31
Power supply fan error
Engine controller board
defective
Replace the engine
controller board.
Exit fan
defective
Replace the exit fan
32
Exit fan error
Engine controller board
defective
Replace the engine
controller board.
Laser unit fan ASSY
defective
Replace the Laser unit fan
ASSY
33
Laser unit fan ASSY error
Engine controller board
defective
Replace the engine
controller board.
Summary of Contents for MFC-9420CN
Page 1: ...Confidential FACSIMILE EQUIPMENT SERVICE MANUAL MODELS MFC 9420CN ...
Page 16: ...Confidential CHAPTER 1 PARTS NAMES FUNCTIONS ...
Page 22: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Page 33: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Page 48: ...Confidential 3 1 4 CBV DBV Fig 3 16 Y M C K Fig 3 17 ...
Page 69: ...Confidential 3 3 5 Fig 3 35 ...
Page 73: ...Confidential 3 3 9 3 Interface Circuit Printer side Fig 3 38 ...
Page 82: ...Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR ...
Page 85: ...Confidential 4 2 Cover page sample End page sample Fig 4 1 ...
Page 86: ...Confidential CHAPTER 5 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 94: ...Confidential 5 5 5 1 1 AC Cord 1 Disconnect AC cord from the machine Fig 5 1 AC cord Machine ...
Page 175: ...Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Page 203: ...Confidential CHAPTER 7 CLEANING ...
Page 205: ...Confidential CHAPTER 8 MAINTENANCE MODE ...
Page 213: ...8 6 Confidential Fig 8 2 Scanning Compensation Data List a b c d e f g h i j k l m n q ...
Page 224: ...8 17 Confidential Cover page sample End page sample Fig 8 8 ...
Page 255: ...Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING ...
Page 279: ...Confidential 9 23 2 Image failure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
Page 280: ...Confidential 9 24 15 a 15 b 16 17 18 19 20 21 22 23 24 25 Fig 9 1 ...
Page 325: ...App 1 5 Confidential 6 Transfer Unit X X X X X X 7 1 2 3 Location SERIAL NO YEAR MONTH DATE ...
Page 398: ...B Power Supply PCB 100V 127V Confidential ...