232 Troubleshooting C7085-90921
3. Referring to Figure 7-36, measure the
resistance for both the upper and lower
thermistors. The resistance should be between
430K ohms and 310K ohms at room
temperature (25° C, 77° F). If the resistance
exceeds limits, replace the fusing assembly. If
resistance is within limits proceed to step 4.
4. Verify the connectors at J1011 of the DC
controller PCB and J1 of the DC power supply
assembly are firmly seated.
5. Replace the power supply assembly.
50.7 FUSER ERROR
Description:
The fusing motor (M1) drives the fusing assembly,
the paper transport (web) assembly, ITB lift
mechanism, transfer roller, transfer roller lift
mechanism, and the face down output delivery drive
assembly. A 50.7 fuser error appears when PS6
detects no motion within the fuser. Photosensor PS6
is the fusing unit pressure switch shown in
Figure 7-27.
Action:
1. Power cycle the printer to try to clear the
message.
2. Remove the left-side cover of the printer. Verify
that the fusing motor (M1) connector is seated
firmly into J102 of the feed PCB.
3. Ensure that the connector at J110 of the feed
PCB is firmly seated (this connector contains
the wiring for PS6, which provides fuser-motion
feedback).
Note Closely inspect the mechanical
linkage. The gears along the
gear “drive” path can bind the
gears, which will prevent M1
from rotating.
4. If the error persists, Observe the drive shaft of
M1 (refer to Figure 7-31) while powering on the
printer. If this shaft DOES NOT rotate, your
failure is related to the motor drive circuitry.
Referring to the printer’s wiring diagram, verify
that connectors J102 and J106 of the feed PCB
are firmly seated. If the error still persists,
replace the fusing motor and the feed PCB in
sequence.
5. If the shaft rotates (both forward and reverse),
and the 50.7 fuser error appears, the cause of
the error is related to the motion feedback
circuitry. Remove the fusing assembly and
verify the sensor flag (see Figure 7-27) is in
good condition and functional. Verify the
connector at sensor PS6 (see Figure 7-27) is
firmly seated. Clean the sensor of dust and
debris. If the error persists replace sensor PS6.
51 LASER ERROR (4500)
-or-
51.X PRINTER ERROR (4550)
Description:
Indicates a beam detect error or laser failure.
Action:
1. Turn the printer off and on to reset the printer.
2. Verify connectors J1102 on the laser driver
PCB and J1008 on the DC controller are
seated properly.
3. Verify connectors J551 on the beam detect
PCB and J1006 on the DC controller are
seated properly.
4. Replace the laser/scanner unit.
Table 7-3 Numerical printer error messages (continued)
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