AL-2020 (serv.man2). Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 77

AL-2040  SIMULATION, TROUBLE CODES  10 - 17

64

01

Self print
Print of one page is made regardless of the status of the optical system.
(Operating procedure)
When this simulation is executed, warm-up is performed and the ready lamp is lighted. Enter the code number with the 10-key, 
and select the cassette with the cassette select key and press the PRINT switch, and paper feed operation will be made from 
the selected cassette and printing of the selected pattern will be made. Printing is in 1by2 mode, or grid pattern.

67

50

USB receive speed adjustment (USB1.1)
Used to set the limitation on the print data receive speed of USB2.0 (Full speed) port (USB port on the machine).
→ When print images from USB2.0 (Full speed) port are disturbed, change the setting and try again.
When this simulation is executed, the currently set code number is displayed.
Enter the code number corresponding to the adjustment value, and press START key to change the setting.

Main 
code

Sub 

code

Content

Code number

Pattern

0

1by2

1

Grid pattern

2

White paper

3

Black background

Code number

Setting

Speed

1

FAST

↑ Fast

2

NORMAL1

3

NORMAL2

4

SLOW

↓ Slow

Main 
code

Sub 

code

Details of trouble

E7

01

Duplex model memory setup error, memory not-
detected error

02

LSU trouble

10

Shading trouble (Black correction)

11

Shading trouble (White correction)

16

Abnormal laser output

F5

02

Copy lamp lighting abnormality

H2

00

Thermistor open

H3

00

Heat roller high temperature detection

H4

00

Heat roller low temperature detection

L1

00

Feeding is not completed within the specified time 
after starting feeding. (The scan head locking switch 
is locked)

L3

00

Scanner return trouble

L4

01

Main motor lock detection

32

Exhaust fan motor lock detection trouble

L6

10

Polygon motor lock detection

U2

04

EEPROM read/write error (Serial communication 
error)

11

Counter check sum error (EEPROM)

Main 
code

Sub 

code

Details of trouble

E7

01

Content Duplex model memory setup error, memory 

not-detected error

Detail

The memory is not set properly or the 
memory capacity is not set to the duplex 
setup (6M).

Check 
and 
remedy

Set SIM 26-39 code number to 2.

02

Content LSU trouble

Detail

The BD signal from the LSU cannot be 
detected in a certain cycle. (Always OFF or 
always ON)

Cause

LSU connector or LSU harness defect or 
disconnection
Polygon motor rotation abnormality
Laser beams are not generated.
MCU PWB abnormality.

Check 
and 
remedy

Check connection of the LSU connector.
Execute SIM 61-03 to check the LSU 
operations.
Check that the polygon motor rotates 
normally.
Check that the laser emitting diode 
generates laser beams.
Replace the LSU unit.
Replace the MCU PWB.

10

Content Shading trouble (Black correction)

Detail

The CCD black scan level is abnormal 
when the shading.

Cause

Improper connection of the CCD unit flat 
cable
CCD unit abnormality
MCU PWB abnormality

Check 
and 
remedy

Check connection of the CCD unit flat 
cable.
Check the CCD unit.