DM-2000 (serv.man7). DM2000 Service Manual-Trouble Code List User Setup - Sharp Copying Equipment Service Manual (repair manual). Page 5

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E7
05
Cause
Flat cable installation failure
CCD unit abnormality
MCU PWB abnormality
Check and
remedy
Check flat cable installation to the
CCD unit.
CCD unit check
MCU PWB check
H2
00
Content
Thermistor open detection
Detail
Fusing thermistor open
Cause
Thermistor defect
MCU PWB defect
Fusing section connector contact
failure
Power failure
Fusing unit not installed
Check and
remedy
Check the harness and the
connector of the thermistor and
the MCU.
Clear the self diag display with
SIM 14.
H3
00
Content
Heat roller abnormally high
temperature
Detail
Fusing temperature of 220 
240˚C.
Cause
Thermistor defect
MCU PWB defect
Fusing connector connection failure
Power failure
Check and
remedy
Check the heater lamp blinking
with SIM 5-2.
When the lamp blinks normally:
Check the thermistor and the
harness. Check the MCU PWB
thermistor input circuit.
When the lamp lights up instead
of blinking:
Check the lamp control circuit of
the power PWB and the MCU
PWB.
Clear the trouble with SIM 14.
H4
00
Content
Heat roller abnormally low
temperature
Detail
When the temperature does not
reach 155˚C within 55 sec after
turning on the power, or when it
falls under 145˚C during printing,
or when it falls under 100˚C
during pre-heating.
Cause
Thermistor failure
Heater lamp failure
MCU PWB failure
Thermostat failure
Power failure
Interlock switch failure
Check and
remedy
Check blinking of the heater lamp
with SIM 5-2.
When the lamp blinks normally:
Check the thermistor and the
harness.
Check the MCU PWB thermistor
input circuit.
H4
00
Check and
remedy
When the lamp does not light:
Check for heater lamp
disconnection or thermostat
disconnection.
Check the interlock switch.
Check the power PWB and MCU
PWB lamp control circuit.
Clear the trouble with SIM 14.
L1
00
Content
Mirror base feed trouble
Detail
The mirror home position (MHPS)
does not turn off though the feed
operation is completed during
mirror initial operation after turning
on the power.
The mirror home position (MHPS)
does not turn off during shading
operation.
The mirror home position (MHPS)
does not turn on when the mirror
base is returned for the specified
time after copy feed is started and
SPF scanning position shift is
performed.
Cause
Mirror unit defect
Mirror home position sensor defect
MCU PWB defect
Scanner wire disconnection
Check and
remedy
Check the scanning operation with
SIM 1-1.
L3
00
Content
Mirror base return trouble
Detail
The mirror home position (MHPS)
does not turn on though the mirror
base returning is completed during
mirror initial operation after turning
on the power.
The mirror home position does not
turn on when the mirror is
returned to the home position
during shading.
The mirror home position (MHPS)
does not turn on when the mirror
base returning is completed for
the specified time (about 6 sec)
after copy return start.
Cause
Mirror unit
Mirror home position sensor defect
MCU PWB defect
Scanner wire disconnection
Check and
remedy
Check the scanning operation with
SIM 1-1.
L4
01
Content
Main motor lock
Detail
The main motor encoder pulse is
not detected for 400msec.
Cause
Main motor defect
Harness disconnection between
the MCU PWB and the main
motor.
Control circuit failure
Check and
remedy
Check the main motor operation
with SIM 25-1.
Check the harness and the
connector between the MCU PWB
and the main motor.
DM-2000
9 – 4
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