Read Sharp MX-5500N / MX-6200N / MX-7000N (serv.man47) Service Manual online
MX-7000N SELF DIAG AND TROUBLE CODE 8 – 12
E7-10
Shading trouble (Black correction)
E7-11
Shading trouble (White correction)
E7-14
SCAN-ASIC trouble
E7-20
LSU BD detection trouble
E7-21
LSU LD deterioration trouble
E7-28
LSU control ASIC connection
abnormality
abnormality
E7-29
LSU-ASIC frequency abnormality
E7-50
Engine connection trouble
Trouble content
CCD black scan level abnormality when the copy
lamp is turned off.
lamp is turned off.
Section
SCU
Case 1
Cause
Installation error of the CCD unit flat cable
Check and
remedy
remedy
Check the installing state of the flat cable to the
CCD unit.
CCD unit.
Case 2
Cause
CCD unit abnormality
Check and
remedy
remedy
Check the CCD unit.
Case 3
Cause
SCU PWB abnormality
Check and
remedy
remedy
Check the SCU PWB.
Trouble content
CCD white reference plate scan level abnormality
when the copy lamp is on.
when the copy lamp is on.
Section
SCU
Case 1
Cause
Installation error of the CCD unit flat cable
Check and
remedy
remedy
Check the installing state of the flat cable to the
CCD unit.
CCD unit.
Case 2
Cause
Dirt on the mirror, the lens, or the reference white
plate.
plate.
Check and
remedy
remedy
Clean the mirror, the lens, or the reference white
plate.
plate.
Case 3
Cause
Copy lamp lighting trouble
Check and
remedy
remedy
Check the installing state of the flat cable to the
copy lamp unit.
copy lamp unit.
Case 4
Cause
CCD unit abnormality
Check and
remedy
remedy
Check the CCD unit.
Case 5
Cause
SCU PWB abnormality
Check and
remedy
remedy
Check the SCU PWB.
Trouble content
Written register value cannot be read correctly
Section
SCU
Case 1
Cause
SCU PWB abnormality
Check and
remedy
remedy
Check the SCU PWB.
Trouble content
LSU BD signal is not detected.
Section
PCU
Case 1
Cause
Disconnection or improper connection of harness
and connector between LD/BD PWB and LSUcnt
PWB
and connector between LD/BD PWB and LSUcnt
PWB
Check and
remedy
remedy
Check connection of the harness of each PWB
inside the LSU.
inside the LSU.
Case 2
Cause
1)
Optical axis shift
2)
BK laser deterioration, power reduction
3)
BD PWB trouble
Check and
remedy
remedy
1)
Use SIM61-1 to check the LSU operation.
2)
Replace the LSUcnt/BD PWB.
3)
If the trouble cannot be removed by the
above 1) to 2), replace the LSU.
above 1) to 2), replace the LSU.
Trouble content
The color laser does not light up normally.
Section
PCU
Case 1
Cause
Disconnection or improper connection of harness
and connector between LD PWB and LSUcnt PWB
and connector between LD PWB and LSUcnt PWB
Check and
remedy
remedy
Check connection of the harness of each PWB
inside the LSU.
inside the LSU.
Case 2
Cause
Y/M/C laser deterioration
Check and
remedy
remedy
1)
Use SIM61-1 to check the LSU operation.
2)
Replace the LSUcnt PWB.
3)
If the trouble cannot be removed by the
above 1) to 2), replace the LSU.
above 1) to 2), replace the LSU.
Trouble content
Access error between the CPU of the PCU PWB
and the LSU control ASIC
and the LSU control ASIC
Section
PCU
Case 1
Cause
Communication connector connection trouble
between the PCU PWB and the LSUcnt PWB
(interface PWB), or harness trouble
between the PCU PWB and the LSUcnt PWB
(interface PWB), or harness trouble
Check and
remedy
remedy
Check the connector connection between the PCU
PWB and the LSUcnt PWB (interface PWB), or
check the harness.
PWB and the LSUcnt PWB (interface PWB), or
check the harness.
Case 2
Cause
PCU PWB or LSUcnt PWB (interface PWB)
trouble
trouble
Check and
remedy
remedy
Replace the PCU PWB or the LSUcnt PWB
(interface PWB).
(interface PWB).
Trouble content
Oscillation trouble of the external oscillator used in
LSU-ASIC and the internal oscillation circuit
LSU-ASIC and the internal oscillation circuit
Section
PCU
Case 1
Cause
Trouble of the oscillator on the LSU-ASIC PWB,
the resistor and capacitor for the oscillation circuit,
and the LSU-ASIC itself.
the resistor and capacitor for the oscillation circuit,
and the LSU-ASIC itself.
Check and
remedy
remedy
Replace the LSUcnt PWB.
Trouble content
Unknown PWB identification information is
detected in the PCU PWB.
detected in the PCU PWB.
Section
PCU
Case 1
Cause
A PWB which is incompatible with the machine
specifications is connected.
specifications is connected.
Check and
remedy
remedy
1)
Replace the PCU PWB.
2)
Replace the LSU PWB.
Case 2
Cause
A firmware which is incompatible with the machine
specifications is used.
specifications is used.
Check and
remedy
remedy
Check the kind and the version of the firmware.
Case 3
Cause
LSU PWB connection trouble
Check and
remedy
remedy
Check the LSU PWB connection.
Case 4
Cause
LSU PWB trouble
Check and
remedy
remedy
Replace the LSU PWB.
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