AL-840 (serv.man9). AL800 840 Service Manual-Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 3

SELF DIAG CODE MESSAGE

L1

No

C1

PHENOMENON

DISPLAY

CODE

MAIN CODE

L1

SUB CODE

00

LAMP

TITLE

Scanner (reading) feed trouble 

DETAIL

1) The scanner (reading) feed operation is not performed.
2) The scanner (reading) feed operation is not recognized.

SECTION

Scanner (reading)

ITEM

Operation

Recognition error

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

Though the specified number (pulses) of the scanner (reading motor feed; motor forward rotation) signals are outputted, the
scanner home position sensor (MHP) OFF cannot be checked.

CASE 1

No

TROUBLE POSITION
CAUSE

The scanner (reading) mechanism operation is not smoothly made.
1) Scanner (reading) mechanism lock
2) Scanner (reading) mechanism wear

REMEDY

(Check)
1) Scanner (reading) drive section assembly
2) Scanner (reading) sliding section (rail, shaft)

(Remedy)
1) Grease up.
2) Scanner (reading) section parts replacement
3) Reset the trouble with SIM 14.

(After work)
1) Adjust when the scanner (reading) section parts are disassembled.

NOTE

CASE 2

No

TROUBLE POSITION
CAUSE

Scanner home position sensor (MHP) signal recognition error
1) Scanner home position sensor (MHP) trouble
2) MCU PWB scanner home position sensor (MHP) input circuit trouble

REMEDY

(Check)
1) Scanner home position sensor (MHP) 
2) MCU PWB scanner home position sensor (MHP) input circuit

(Remedy)
1) Scanner home position sensor (MHP) replacement
2) MCU PWB replacement
3) Rest 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

Scanner (reading) motor drive trouble
1) Scanner (reading) motor trouble
2) MCU PWB scanner (reading) motor control circuit trouble

REMEDY

(Check)
1) Scanner (reading) motor
2) MCU PWB scanner (reading) motor control circuit trouble

(Remedy)
1) Scanner (reading) motor 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

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