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AL-1556/1566  TEST COMMAND, FAX SOFT SWITCH, TROUBLE CODES  10 - 69

E7

11

Content Shading trouble (White correction)
Detail

The CCD white scan level is abnormal when the 
shading.

Cause

Improper connection of the CCD unit flat cable
Dirt on the mirror, the lens, and the reference 
white plate
Copy lamp lighting abnormality
CCD unit abnormality
MCU PWB abnormality
(When occurred in the SPF scan position.)
Improper installation of the mirror unit

Check 
and 
remedy

Clean the mirror, lens, and the reference white 
plate.
Check the light quantity and lighting status of 
the copy lamp (TC 05-03).
Check the MCU PWB.

16

Content Abnormal laser output
Detail

When the laser output is stopped, HSYNC is 
detected.

Cause

Laser abnormality
MCU PWB abnormality.

Check 
and 
remedy

Check the laser emitting diode operation.
Replace the MCU PWB.

F5

02

Content Copy lamp lighting abnormality
Detail

The copy lamp does not turn on.

Cause

Copy lamp abnormality
Copy lamp harness abnormality
CCD PWB harness abnormality.

Check 
and 
remedy

Use TC 5-3 to check the copy lamp operations.
When the copy lamp lights up.
Check the harness and the connector between 
the CCD unit and the MCU PWB.
When the copy lamp does not light up.
Check the harness and the connector between 
the copy lamp unit and the MCU PWB.
Replace the copy lamp unit.
Replace the MCU PWB.

F6

10

Content FAX board trouble (AL-1566)
Detail

Communication trouble between MCU and FAX 
control PWB

Cause

FAX control PWB connector disconnection
Defective harness between FAX control PWB 
and MCU PWB
Motherboard connector pin breakage
FAX control PWB ROM error/Data error
IC on FAX PWB causes abnormality

Check 
and 
remedy

Check connector/harness of FAX control PWB 
and MCU PWB.
Check the grounding of the copier.
Check FAX control PWB ROM.
Replace the FAX PWB.

H2

00

Content Thermistor open
Detail

The thermistor is open.
The fusing unit is not installed.

Cause

Thermistor abnormality
Control PWB abnormality
Fusing section connector disconnection
The fusing unit is not installed.

Check 
and 
remedy

Check the harness and the connector between 
the thermistor and the PWB.
Use TC 14 to clear the self diagnostic display.

Main 
code

Sub 

code

Details of trouble

H3

00

Content Heat roller high temperature detection
Detail

The fusing temperature exceeds 240°C.

Cause

Thermistor abnormality
Control PWB abnormality
Fusing section connector disconnection.

Check 
and 
remedy

Use TC 5-02 to check the heater lamp blinking 
operation.
When the lamp blinks normally.
Check the thermistor and its harness.
Check the thermistor input circuit on the control 
PWB.
When the lamp keeps ON.
Check the power PWB and the lamp control 
circuit on the MCU PWB.
Use TC 14 to clear the self diagnostic display.

H4

00

Content Heat roller low temperature detection

Detail

The fusing temperature does not reach 185°C 
within 27 sec of turning on the power, or the 
fusing temperature keeps at 140°C.

Cause

Thermistor abnormality
Heater lamp abnormality
Thermostat abnormality
Control PWB abnormality

Check 
and 
remedy

Use TC 5-02 to check the heater lamp blinking 
operation.
When the lamp blinks normally.
Check the thermistor and its harness.
Check the thermistor input circuit on the control 
PWB.
When the lamp does not light up.
Check for disconnection of the heater lamp and 
the thermostat. Check the interlock switch.
Check the power PWB and the lamp control 
circuit on the MCU PWB.
Use TC 14 to clear the self diagnostic display.

L1

00

Content Feeding is not completed within the specified 

time after starting feeding. (The scan head 
locking switch is locked)

Detail

The white area and the black marking on the 
shading plate are used to obtain the difference 
in the CCD level values for judgment of lock. 
When the difference in the levels of which and 
black is small, it is judged that the black mark 
could not be scanned by lock and the trouble 
code “L1” is displayed.

Cause

The scan head is locked by the lock switch.
Mirror unit abnormality
The scanner wire is disconnected.
The origin detection sensor abnormality
Mirror motor harness abnormality

Check 
and 
remedy

Check to confirm that the scan head lock switch 
is released.
Use TC 1-1 to check the mirror reciprocating 
operations.
When the mirror does not feed.
Check for disconnection of the scanner wire.
Check the harness and the connector between 
the mirror motor and the MCU PWB.
Replace the mirror unit.
Replace the MCU PWB.
When the mirror does feed.
Use TC 1-2 to check the mirror home position 
sensor.

Main 
code

Sub 

code

Details of trouble

AL-1556/1566  TEST COMMAND, FAX SOFT SWITCH, TROUBLE CODES  10 - 70

Communication error xx (xxxx)

(In print out, the communication error display is made. In FAX status
check, “NGxxxxxx” is displayed.

When transmission or reception is not executed normally due to distur-
bance in protocol signals and image signals by the trouble in the line,
the code of 6 digits is displayed on the transmission result check menu
(reception result check menu).

Upper 2 digits of a communication error code: 00 – 58 (error code) is
displayed. (Communication result code)

Lower 4 digits of a communication error code: Error code1, Error code
2

1) Refer to the communication result code.

2) Refer to error code 1.

3) Refer to error code 2.

(Error code 1 other than V.34 mode is “00”.)

L3

00

Content Scanner return trouble
Detail

When the mirror base is returned for the 
specified time (6 sec) in mirror initializing after 
turning on the power, the mirror home position 
sensor (MHPS) does not turn ON. Or when the 
mirror base is returned for the specified time 
(about 6 sec) after start of copy return, the 
mirror home position sensor (MHPS) does not 
turn ON.

Cause

Mirror unit abnormality
Scanner wire disconnection
Origin detection sensor abnormality
Mirror motor harness abnormality

Check 
and 
remedy

Use TC 1-1 to check the mirror reciprocating 
operations.
When the mirror does not return.
Check for disconnection of the scanner wire.
Check the harness and the connector between 
the mirror motor and the MCU PWB.
Replace the mirror unit.
Replace the MCU PWB.
When the mirror does feed.
Use TC 1-2 to check the mirror home position 
sensor.

L4

01

Content Main motor lock detection

Detail

When the main motor encoder pulse is not 
detected for 100 msec.

Cause

Main motor unit abnormality
Improper connection or disconnection the main 
motor and the harness.
MCU PWB abnormality

Check 
and 
remedy

Use TC 25-01 to check the main motor 
operations.
Check connection of the main motor harness/
connector.
Replace the main motor.
Replace the MCU PWB.

L6

10

Content Polygon motor lock detection

Detail

The lock signal (specified rpm signal) does not 
return within a certain time (about 20 sec) from 
starting the polygon motor rotation.

Cause

Polygon motor unit abnormality
Improper connection or disconnection of the 
polygon motor and the harness.
MCU PWB abnormality

Check 
and 
remedy

Use TC 61-1 to check the polygon motor 
operations.
Check connection of the polygon motor 
harness/connector.
Replace the polygon motor.
Replace the MCU PWB.

U1

03

Content FAX board battery error (AL-1566)

Details

The SRAM backup battery voltage on FAX 
PWB falls.

Cause

The SRAM backup battery voltage on FAX 
PWB falls.

Check 
and 
remedy

Check voltage of the SRAM back up battery.
Replace the battery.

Main 
code

Sub 

code

Details of trouble

U2

04

Content EEPROM read/write error (Serial 

communication error)

Detail

EEPROM access process error

Cause

EEPROM abnormality

Check 
and 
remedy

Check that the EEPROM is properly set.
Use TC 16 to cancel the trouble.
Replace the MCU PWB.

11

Content Counter check sum error (EEPROM)

Detail

Check sum error of the counter area in the 
EEPROM

Cause

EEPROM abnormality

Check 
and 
remedy

Check that the EEPROM is properly set.
Use TC 16 to cancel the trouble.
Replace the MCU PWB.

U9

99

Content Operation panel language error

Detail

There is no language file. 
The language file is destroyed. 

Cause

Language file abnormality
MCU PWB abnormality

Check 
and 
remedy

MCU firmware download
Replace the MCU PWB.

Error code 

(Communication 

result)

Communication 

report result 

column

Communication interruption 

content

0 – 31

For details of 0 – 
31, refer to the 
communication 
result code.

Depends on the 
communication 
disconnection position.
For 16 or later, V.34 mode 
communication.

33

Busy

The calling side cannot 
connect the line with the 
other party.

34

Cancel

An interruption command is 
made during transmission or 
reception.
A reservation is canceled.
An interruption command is 
entered with the interruption 
key.

35

Power OFF

Power OFF during 
transmission or reception

36

(Recording paper 
empty)

Main 
code

Sub 

code

Details of trouble

AL-1556/1566  TEST COMMAND, FAX SOFT SWITCH, TROUBLE CODES  10 - 71

(Note) For error codes 16 – 31, V.34 mode communication.

37

(Recording paper 
jam)

38

Reception 
memory over

Memory over during 
reception

39

(Discrepancy in 
the number of 
sheets)

40

(Interface not 
accepted)

41

Transmission 
length over

The length of transmission 
data of one page exceeds 
the range during 
transmission.

42

Reception length 
over

The length of reception data 
of one page exceeds the 
range during reception.

43

Communication 
(OK)

Communication enable 
before transmission

44

Document error

A document jam during 
direct transmission

45

(Image quality 
error)

46

No response from 
the other party

The FAX signal from the 
other party cannot detect 
within T1 time.

47

(Communication 
error)

48

OK

Communication normal end

49

No send request 
function on the 
other party

The other party has no send 
request function when 
receiving a send request.

The other party has no data 
to send.

50

Send request not 
accepted

DCN is received for DTC 
when sending a send 
request.
There is no data to send 
when sending a send 
request.

51

Send request 
enable number 
discrepancy

Discrepancy in the enable 
number when sending a 
send request.
Discrepancy in the system 
number when sending a 
send request.

52

No confidential 
function on the 
other party

The other party has no 
confidential function when 
sending a confidential 
message. (Including the 
other company’s machines)

53

Confidential 
function not 
accepted

DCN is received for NSS 
when receiving a 
confidential message.

54

Confidential box 
No. NG

A confidential box number 
which is not registered is 
directed when receiving a 
confidential message.

55

No interface 
function on the 
other party

The other party has no 
interface function when 
sending an interface 
command.

Error code 

(Communication 

result)

Communication 

report result 

column

Communication interruption 

content

56

Interface not 
accepted

DCN is received for NSS 
when sending an interface 
command.
A receiving station number 
which is not registered is 
directed when receiving an 
interface command.

57

Interface ID 
discrepancy

Discrepancy in the
interface ID when
receiving an interface
command.

58

Reception 
inhibition number

Transmission is made from 
a reception inhibition 
number.

Error 
code

Final reception signal 

(Transmitting side)

Final reception signal 

(Receiving side)

0

Abnormal signal

Abnormal signal

1

NSF, DIS

NSS, DCS

2

CFR

NSC, DTC

3

FTT

EOP

4

MCF

EOM

5

PIP, PIN

MPS

6

RTN, RTP

PRI-Q

7

No signal

DCN

8

PPR

PPS-EOP

9

PPS-EOM

10

PPS-MPS, PPS-NULL

11

RNR

RR

12

CTR

CTC

13

ERR

EOR-Q

14

PPS-PRI-Q

15
16

Abnormal signal

Abnormal signal

17

NSF, DIS

NSS, DCS

18

CFR

NSC, DTC

19

FTT

PPS-EOP

20

MCF

PPS-EOM

21

PIP, PIN

PPS-MPS, PPS-NULL

22

RTN, RTP

PRI-Q

23

No signal

DCN

24

PPR

25

RNR

RR

26

CTR

CTC

27

ERR

EOR-Q

28

PPS-PRI-Q

29

V.8 Phase-1

V.8 Phase-1

30

V.8 Phase-2

V.8 Phase-2

31

V.8 Phase-3

V.8 Phase-3

Error code 

(Communication 

result)

Communication 

report result 

column

Communication interruption 

content

AL-1556/1566  TEST COMMAND, FAX SOFT SWITCH, TROUBLE CODES  10 - 72

Error codes 1 are fixed to “00”.

Error 

codes 2

Content of communication interruption

Transmission/

Reception

01

Transmission length over

Transmission

02

EOL time over

Reception

03

Carrier detection time up

Reception

04

Polarity reversion detection (in phase C)

Transmission/
Reception

05

8 min over (in phase C)

Transmission

06

Memory image decoding error

Reception

07

Memory image decoding error

Transmission

08

Time up between frames in phase C

Transmission/
Reception

10

Communication request NG

Reception

11

Polarity reversion detection

Reception

12

Invalid command reception

Reception

13

Time over (1min timer/6sec timer)

Reception

14

PUT error

Reception

15

Time out occurrence during shift from 
Primary to Control in V.34 mode

Reception

20

Polarity reversion detection

Transmission

21

Invalid command reception

Transmission

22

Fall back retry number over

Transmission

23

Resend over of retry number

Transmission

24

Time over (T5 timer)

Transmission

25

Time over (T5 timer) in V.34 mode

Transmission

26

Time out occurrence during shift from 
Primary to Control in V.34 mode

Transmission

30

Communication error due to 
communication abnormality between 
FAX_SUB and FAX_MAIN

Transmission/
Reception