Sharp AR-M450 Service Manual page 141

MAIN SUB
F6 00 Content Communication trouble (ICU detection)
between ICU and FAX
Details Communication establishment error/Fleming/
Parity/Protocol error
Cause Slave unit PWB connector disconnection
Harness abnormality between slave unit
PWB and ICU PWB.
Slave unit PWB mother board connector pin
breakage
Slave unit ROM abnormality/No ROM/
Reverse insertion of ROM/ROM pin
breakable
Check & Check connector harness between slave unit
Remedy PWB and ICU PWB.
Check grounding of machine.
Check slave unit PWB ROM.
01 Content FAX expansion flash memory abnormality
(ICU detection)
Details Expansion flash memory with SRAM backup
data is installed.
Cause SRAM backup data is detected in expansion
flash memory.
Expansion flash memory in which SRAM
data are backed up with SIM 66-19 is
installed.
Check & Restore backup data to SRAM with SIM 66-
Remedy 20, and clear expansion flash memory with
SIM 66-10. If data are unnecessary,
clear expansion flash memory with SIM 66-
10.
04 Content FAX modem operation abnormality
Details FAX PWB modem chip operation
abnormality
Cause The boot test pin in the FAX PWB is shorted
and normal operation is tried.
Modem chip operation abnormality in FAX
PWB
Check & Turn on the power again without shorting the
Remedy boot test pin in the FAX PWB.
Replace FAX PWB.
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 & Replace FAX PWB.
Remedy
H2 00··· Content thermistor open
HL1 Fusing unit not installed
(RT
Detail Thermistor is open.
H1)
(An input voltage of 2.92V or above is
detected.)
01···
Fusing unit not installed
HL2
Cause Thermistor trouble
(RT
Control PWB trouble
H2)
Fusing section connector disconnection
AC power trouble
Fusing unit not installed
Check and Check harnesses and connectors from the
remedy thermistor to the control PWB.
Use DIAG (SIM14) to clear the self diag
display.
MAIN SUB
H3 00···
HL1
(RT
H1)
01···
HL2
(RT
H2)
H4 00···
HL1
(RT
H1)
01···
HL2
(RT
H2)
H5 01
L1 00
AR-M350 TROUBLE CODES 11-7
Content Fusing section high temperature trouble
Detail The fusing temperature exceeds 242°C.
(An input voltage of 0.27V or above is
detected.)
Cause thermistor trouble
Control PWB trouble
Fusing section connector disconnection
AC power trouble
Check and Use DIAG (SIM5-2) to check the heater lamp
remedy
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 DIAG (SIM14) to cancel the trouble
Content Fusing section low temperature trouble
Detail •The set temperature is not reached within
the specified time (normally 3 min) when
warming up or resetting from pre-heating.
•Under the ready state.
(An input voltage of 1.21V or below is
detected 5 times continuously.)
Cause thermistor trouble
Heater lamp trouble
Control PWB trouble
Thermostat trouble
AC power trouble
Interlock switch trouble
Check and Use DIAG (SIM5-2) to check the heater lamp
remedy 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 DIAG (SIM14) to cancel the trouble.
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 Check jam paper in the fusing section.
remedy (winding, etc.)
Check POD1 sensor harness, and check the
fusing unit installation.
Use DIAG (SIM14) to cancel the trouble.
Content Scanner feed trouble
Details Scanner feed is not completed within the
specified time.
Cause Scanner unit abnormality
Scanner wire disconnection
Check & Check scanning with SIM 1-1.
Remedy