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AL-1552/AL-1553

DUPLEX-RELATED ITEMS

1 – 2

No.

Part name

Control signal

Function/Operation

1

Main motor

MM

Drives the copier.

2

Scanner motor

MRMT

Drives the optical mirror base (scanner unit).

3

Toner motor

TM

Supplies toner.

4

Cooling fan motor

VFM

Cools the optical section.

5

Resist roller solenoid

RRS

Resist roller rotation control solenoid

6

Paper feed solenoid

CPFS1

Cassette Paper feed solenoid 1

7

Multi paper feed solenoid

MPFS

Multi manual pages feed solenoid

8

SPF motor

SPFM

Drives the single pass feeder

9

Duplex motor

DMT

Devices the duplex paper transport section

10

Original feed solenoid

SPUS

Original feed solenoid

11

Paper feed solenoid

CPFS2

Cassette Paper feed solenoid 2

12

SPF resist roller solenoid

SRRS

Original resist roller solenoid

13

SPF paper feed solenoid

SPFS

Original paper feed solenoid

3

9

2

13

8

12

10

4

1

5

7

11

6

AL-1552/AL-1553

DUPLEX-RELATED ITEMS

1 – 3

1) Remove four screws.

2) Remove the rear cabinet.

1) Disconnect each connector.

2) Remove four screws, and remove the MCU PWB.

3) Disconnect the connector.

4) Remove five screws, and remove the I/F PWB.

1) Remove two screws.

2) Remove the Duplex motor cover.

3) Remove the Duplex motor.

Note: When reassembling, be sure to engage the Duplex motor gear

with the belt on the main body side.

1) Remove four screws.

2) Remove the spring, and the earth wire.

3) Remove the reverse unit.

1) Bend the reverse roller and remove it.

1

2

3

1

AL-1552/AL-1553

DUPLEX-RELATED ITEMS

1 – 4

This step adjusts the front surface printing (odd-number pages of a doc-

ument set) in the S-D mode copying and the leading edge position of an

image on even-number pages in the D-S mode.
That is, it covers the adjustment of the second surface printing mode

(image loss at the front edge of an image) in which image data is once

stored in memory.
The image data is read, starting from its front end in the document deliv-

ery direction (Reference direction of document setting in the OC

mode)and stored in memory.
This stored image data is printed starting at the printing start position, in

the order of last-stored data to the first-stored data.

In other words, the front edge image loss of the image can be adjusted
by changing the document read end position.

1) Preparing test chart (Draw a scale at the rear end of one side of a

sheet of A4 white paper or letter paper).

2) Set the test chart so that the scale is positioned as shown below,

in the S-D mode.

3) Execute simulation 50-18 to make a copy and check the front edge

image loss at the area where the scale is printed.

Adjust the setting so that the front edge image loss is less than 4.0

mm in the Duplex mode.
An increase of 1 in setting represents an increase of 0.1 mm 

in image loss.

This is the adjustment of the first surface printing mode (rear end void)
in duplex copying.
In a duplex copying operation, the paper is delivered starting from the
rear end of the first printing surface. It is therefore necessary to make a
void area at the rear end on the first printing surface to prevent paper
jam at the fusing part.
Adjustment modes:

1) Paper trailing edge void quantity 50-19 (TEXT)

This adjustment is made when the cassette paper size is recog-
nized. The trailing edge void quantity can be adjusted by changing

the trailing edge image laser OFF timing.

1) Preparing test chart (Draw a scale at the rear end of one side of a

sheet of A/4 white paper or letter paper)

2) Set the test chart on the document glass as shown below.

3) Using the user simulation [18], set the paper size of the first cassette.

4) Execute simulation 50-19 to turn on the TEXT lamp and make the

printing mode in OC-D mode.
Make a copy of the test chart to check the void area of the scale on
the image.

Adjust the setting so that the void area is 4 - 5 mm. An increase in 1
of setting represents 0.1 mm in void area.

Scale (S-D mode)

5 10

The front edge of the

scale on test chart

 Front edge of paper

Void area

less than 4 mm

•  Letter paper

: 4

•  A4 paper

: 3

2nd printing surface where scale is printed (lower side)

Document guide

The trailing edge has a scale

Table glass

The trailing edge void on the first printing surface is shown above.

Paper 

Void position to be check

AL-1552/AL-1553

DUPLEX-RELATED ITEMS

1 – 5

Sim

No.

Kind of 

main code

Sub

code

Operation

01

Optical system

01
06

Mirror scan operation
Aging of mirror scanning

02

SPF Individual
load operation

02

03
04

SPF sensor status display

Motor ON
Paper feed solenoid ON

05

Lamp ON check

01

02
03

Operation panel display check

Fusing lamp, cooling fan operation check
Copy lamp ON

06

Machine
individual load
operation

01

02

Paper feed solenoid ON

Resist solenoid ON

07

Aging

01
06

Warm-up display and aging with jam
Intermittent aging

08

High voltage
output check

01

02
03

06

Developing bias

Main charger (Grid high)
Grid voltage (Low)

Transfer charger

10

Other

None Toner motor aging

14

Trouble reset

None Cancel of troubles other than U2

16

U2 trouble reset None Cancel of U2 trouble

22

Counter display

04
05

08

12
14

17

18
19

21

22

JAM total counter display
Total counter display

SPF counter display

Drum counter display
P-ROM version display

Copy counter display

Printer counter display
Scanner mode counter display

Scanner counter display

SPF JAM counter display

24

Special counter
clear

01

04

07
08

09

13
14

15

JAM total counter clear

SPF counter clear

Drum counter clear
Copy counter clear

Printer counter clear

Scanner counter clear
SPF JAM total counter clear

Scanner mode counter clear

25

Main motor ON

01

10

Main motor operation check (Cooling 
fan motor rotation check)

Polygon motor ON

26

Various setup

01

02

03

04

06

07

20

30

38

39

40

42

43

44

62

63

Manual feed setup

(R) SPF setup

Second cassette setup

Machine duplex setup

Destination setup

Machine conditions check

Rear edge void setup

CE mark support control ON/OFF

Cancel of stop at drum life over

Memory capacity check

Polygon motor OFF time setup

Time required for turning OFF after

completion of printing)

Transfer ON timing control setup

Side void setup

SPF document rear edge read setup

Energy-save mode copy lamp setup

Fan control select setup

30

Sensor 
operation check
(Standard 
provision)

01

Paper sensor status display

43

Fusing
temperature
setup

01
04

05

09

Fusing temperature setup (Normal copy)
Fusing temperature setup 2

Fusing temperature setup in duplex

copy
Setup of fusing control of postcard size

paper

46

Exposure 
adjustment

01
02

18

19
20

29

31
32

Copy density adjustment (300dpi)
Copy density adjustment (600dpi)

Image contrast adjustment (300dpi)

γ

 table setup or AE operation mode setup

SPF exposure correction

Image contrast adjustment (600dpi)

Image sharpness adjustment
Copier color reproduction setup

48

Magnification
ratio correction

01

Front/rear (main scanning) direction and

scan (sub scanning) direction 
magnification ratio adjustment

49

01

Flash ROM program writing mode

50

Lead edge
adjustment

01
10

18

19

Lead edge image position
Center offset adjustment

Memory reverse position adjustment

in duplex copy
Duplex copy rear edge void adjustment

51

Timing 
adjustment

02

Resist quantity adjustment

53

08

SPF scan position automatic adjustment

61

Laser system
operation

03

Polygon motor check

(HSYNC output check)

63

Shading

01

Shading check

64

Self print

01

Self print

Sim

No.

Kind of 

main code

Sub

code

Operation