AR-M351U, AR-M451U (serv.man19). Trouble Codes — Sharp Copying Equipment Service Manual (repair manual). Page 9

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AR-M351U/M451U, AR-M355U/M455U  TROUBLE CODES  11 - 9
F7
01
Content
FAX board EEPROM read/write error
Details
EEPROM access error (read/write)
Cause
EEPROM trouble
FAX PWB EEPROM access circuit 
trouble
Check & 
Remedy
When replacing the EEPROM, use 
SIM66-4/5 (Signal send level)  and 
SIM66-14/15/16 (Dial test) for 
adjustment. However, note that all the 
soft switches are reset to the initial 
values.
No need to adjust when the PWB is 
replaced.
H2
00···
HL1
01···
HL2
Content
Thermistor open
Fusing unit not installed
Detail
Thermistor is open. 
(An input voltage of 2.92V or above is 
detected.)
Fusing unit not installed
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector 
disconnection
AC power trouble
Fusing unit not installed
Check and 
remedy
Check harnesses and connectors from 
the thermistor to the control PWB.
Use SIM14 to clear the self diag 
display.
H3
00···
HL1
01···
HL2
Content
Fusing section high temperature 
trouble
Detail
The fusing temperature exceeds 
242°C. (An input voltage of 0.27V or 
above is detected.)
Fusing temperature control is started, 
and 242°C is detected three or more 
times continuously in sampling in the 
specified interval. (Every 300msec) 
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector 
disconnection
AC power trouble
Check and 
remedy
Use SIM5-2 to check the heater lamp
Blinking operation.
If the heater lamp blinks normally:
Check the thermistor and its 
harness.
Check the thermistor input circuit in 
the control PWB.
If the heater lamp keep lighting:
Check the AC PWB and the lamp 
control circuit in the control PWB.
Use SIM14 to cancel the trouble
MAIN SUB
Details
H4
00···
HL1
01···
HL2
Content
Fusing section low temperature trouble
Detail
The set temperature is not reached 
within the specified time (3 min) after 
turning on the power relay, or the 
temperature does not reach 80°C 
within 80 sec.
When the heater lamp is not turned off 
in the specified time (3 min) from 
starting warm-up, or the temperature 
does not reach 80°C within 80 sec.
After completion of warm-up operation, 
a temperature 50°C lower than the 
temperature control level is detected 5 
times continuously in sampling in the 
specified interval. (every 300msec)
Cause
Thermistor trouble
Heater lamp trouble
Control PWB trouble
Thermostat trouble
AC power trouble
Interlock switch trouble
Check and 
remedy
Use SIM5-2 to check the heater lamp
Blinking operation.
If the heater lamp blinks normally:
Check the thermistor and its 
harness.
Check the thermistor input circuit in 
the control PWB.
If the heater lamp does not light:
Check for heater lamp disconnection 
and thermostat disconnection.
Check the interlock switch.
Check the AC PWB and the lamp 
control circuit in the control PWB.
Use SIM14 to cancel the trouble.
H5
01
Content
5-time continuous POD1 not-reaching 
jam detection
Detail
5-time continuous POD1 not-reaching 
jam detection
Cause
A fusing section jam is not properly 
removed. (Jam paper remains.)
POD1 sensor trouble, or harness 
disconnection
Improper installation of fusing unit
Check and 
remedy
Check jam paper in the fusing section. 
(winding, etc.)
Check POD1 sensor harness, and 
check  the fusing unit installation.
Use SIM14 to cancel the trouble.
L1
00
Content
Scanner feed trouble
Details
Scanner feed is not completed within 
the specified time.
Cause
Scanner unit abnormality
Scanner wire disconnection
Check & 
Remedy
Check scanning with SIM 1-1.
L3
00
Content
Scanner return trouble
Details
Scanner return is not completed within 
the specified time.
Cause
Scanner unit abnormality
Scanner wire disconnection
Check & 
Remedy
Check scanning with SIM 1-1.
MAIN SUB
Details
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