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No

C7

BASIC CAUSE 1

ASIC internal register operation trouble

CASE 1

No

TROUBLE POSITION
CAUSE

ASIC internal register operation trouble
ASIC (MCU PWB) trouble

REMEDY

(Check)

(Remedy)
MCU PWB replacement

(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and

adjustment values.

NOTE

SELF DIAG CODE MESSAGE

E7

No

C8

PHENOMENON

DISPLAY

CODE

MAIN CODE

E7

SUB CODE

15

LAMP

TITLE

Shading correction (white level) trouble

DETAIL

1) White level output abnormality during shading correction
2) White level output recognition error during shading correction

SECTION

Scanner (reading)

ITEM

TYPE (MODE)

User

Warning

Service

YES

Trouble

YES

Other

Other

OPERATION MODE

Copy

Machine operation when the
message is displayed

Stop

NOTE

BASIC CAUSE 1

White level output recognition error during shading correction

CASE 1

No

TROUBLE POSITION
CAUSE

Scanner (reading) optical system does not transmit images (light) normally.
1) Scanner (reading) optical system dirt
2) Scanner (reading) optical parts installing position shift

REMEDY

(Check)
1) Scanner (reading) optical system dirt
2) Scanner (reading) optical parts installing position 
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)

(Remedy)
1) Scanner (reading) optical system cleaning
2) Scanner (reading) optical parts installing position adjustment 
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)

After work
1) Copy density adjustment

NOTE

CASE 2

No

TROUBLE POSITION
CAUSE

White level output recognition error during shading correction 
1) CCD unit trouble
2) MCU PWB image signal (CCD) input circuit trouble

REMEDY

(Check)
1) CCD unit output
2) MCU PWB image signal (CCD) input circuit

(Remedy)
1) CCD unit replacement
2) MCU PWB replacement

(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and

adjustment values.

NOTE

10 – 9

No

C8

CASE 3

No

TROUBLE POSITION
CAUSE

Copy lamp light quantity abnormality
1) Copy lamp trouble
2) Copy lamp control PWB trouble
3) Copy lamp light quantity adjustment trouble

REMEDY

(Check)
1) Copy lamp
2) Copy lamp control PWB
3) Copy lamp light quantity level

(Remedy)
1) Copy lamp replacement
2) Copy lamp control PWB replacement
3) Copy lamp light quantity level adjustment

(After work)
1) Copy density adjustment

NOTE

SELF DIAG CODE MESSAGE

H2

No

C9

PHENOMENON

DISPLAY

CODE

MAIN CODE

H2

SUB CODE

00

LAMP

TITLE

Fusing temperature sensor (thermistor) trouble

DETAIL

1) Fusing temperature sensor (thermistor) output level abnormality
2) Fusing temperature sensor (thermistor) output level recognition error 

SECTION

Fusing

ITEM

TYPE (MODE)

User

Warning

Service

YES

Trouble

YES

Other

Other

OPERATION MODE

All modes

Machine operation when the
message is displayed

Stop

NOTE

BASIC CAUSE 1

Fusing temperature sensor (thermistor) output level recognition error

CASE 1

No

TROUBLE POSITION
CAUSE

Fusing temperature sensor (thermistor) signal recognition error
1) Fusing temperature sensor (thermistor) trouble
2) MCU PWB fusing temperature sensor (thermistor) input circuit trouble

REMEDY

(Check)
1) Fusing temperature sensor (thermistor)
2) MCU PWB fusing temperature sensor (thermistor) input circuit

(Remedy)
1) Fusing temperature sensor (thermistor) replacement
2) MCU PWB replacement
3) Reset the trouble with SIM 14.

(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and

adjustment values.

NOTE

SELF DIAG CODE MESSAGE

H3

No

C10

PHENOMENON

DISPLAY

CODE

MAIN CODE

H3

SUB CODE

00

LAMP

TITLE

Fusing high temperature trouble

DETAIL

1) Fusing temperature sensor (thermistor) output level abnormality
2) Fusing temperature sensor (thermistor) output level recognition error

SECTION

ITEM

TYPE (MODE)

User

Warning

Service

YES

Trouble

YES

Other

Other

OPERATION MODE

Machine operation when the
message is displayed

Stop

NOTE

10 – 10

No

C10

BASIC CAUSE 1

1) Fusing temperature (thermistor) output level recognition error
2) Fusing temperature sensor (thermistor) output level abnormality

CASE 1

No

TROUBLE POSITION
CAUSE

Fusing temperature sensor (thermistor) signal recognition error
1) Fusing temperature sensor (thermistor) trouble
2) MCU PWB temperature sensor (thermistor) input circuit trouble
3) Fusing temperature sensor (thermistor) dirt

REMEDY

(Check)
1) Fusing temperature sensor (thermistor)
2) MCU PWB fusing temperature sensor (thermistor) input circuit

(Remedy)
1) Fusing temperature sensor (thermistor) replacement
2) MCU PWB replacement
3) Fusing temperature sensor (thermistor) cleaning
4) Reset the trouble with SIM 14.

(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and

adjustment values.

NOTE

CASE 2

No

TROUBLE POSITION
CAUSE

Heater lamp control signal trouble
1) MCU PWB heater lamp control circuit trouble

REMEDY

(Check)
1) MCU PWB

(Remedy)
1) MCU PWB replacement
2) Reset the trouble with SIM 14.

(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and

adjustment values.

NOTE

CASE 3

No

TROUBLE POSITION
CAUSE

Heater lamp drive trouble
1) Power PWB heater lamp drive circuit trouble

REMEDY

(Check)
1) Power PWB

(Remedy)
1) Power PWB replacement
2) Reset the trouble with SIM 14.

(After work)

NOTE

SELF DIAG CODE MESSAGE

H4

No

C11

PHENOMENON

DISPLAY

CODE

MAIN CODE

H4

SUB CODE

00

LAMP

TITLE

Fusing low temperature trouble

DETAIL

1) Fusing temperature sensor (thermistor) output level abnormality
2) Fusing temperature sensor (thermistor) output level recognition error

SECTION

ITEM

TYPE (MODE)

User

Warning

Service

YES

Trouble

YES

Other

Other

OPERATION MODE

Machine operation when the
message is displayed

Stop

NOTE

BASIC CAUSE 1

1) Fusing temperature sensor (thermistor) output level abnormality
2) Fusing temperature sensor (thermistor) output level recognition error

10 – 11

No

C11

CASE 1

No

TROUBLE POSITION
CAUSE

Fusing temperature sensor (thermistor) signal recognition error
1) Fusing temperature sensor (thermistor) trouble
2) MCU PWB fusing temperature sensor (thermistor) input circuit trouble

REMEDY

(Check)
1) Fusing temperature sensor (thermistor)
2) MCU PWB fusing temperature sensor (thermistor) input circuit

(Remedy)
1) Fusing temperature sensor (thermistor) replacement
2) MCU PWB replacement
3) Reset the trouble with SIM 14.

(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and

adjustment values.

NOTE

CASE 2

No

TROUBLE POSITION
CAUSE

Heater lamp control signal trouble
1) MCU PWB heater lamp control circuit trouble

REMEDY

(Check)
1) MCU PWB

(Remedy)
1) MCU PWB replacement
2) Reset the trouble with SIM 14.

(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and

adjustment values.

NOTE

CASE 3

No

TROUBLE POSITION
CAUSE

Heater lamp drive trouble
1) Power PWB heater lamp drive circuit trouble

REMEDY

(Check)
1) Power PWB

(Remedy)
1) Power PWB replacement
2) Reset the trouble with SIM 14.

(After work)

NOTE

SELF DIAG CODE MESSAGE

U2

No

C12

PHENOMENON

DISPLAY

CODE

MAIN CODE

U2

SUB CODE

01

LAMP

TITLE

EEPROM (MCU PWB) trouble (counter data error)

DETAIL

EEPROM (MCU PWB) counter data trouble (data error)

SECTION

MCU PWB

EEPROM

ITEM

TYPE (MODE)

User

Warning

Service

Trouble

Other

Other

OPERATION MODE

All modes

Machine operation when the
message is displayed

Stop

NOTE

BASIC CAUSE 1

EEPROM (MCU PWB) counter data trouble (data error)

CASE 1

No

TROUBLE POSITION
CAUSE

EEPROM (MCU PWB) counter data trouble
EEPROM (MCU PWB) trouble

REMEDY

(Check)

(Remedy)
1) MCU PWB replacement
2) Reset the trouble with SIM 14.
3) Use simulations to set various set values and adjustment values.

(After work)

NOTE

10 – 12