Troubleshooting
Printer Error Troubleshooting
Table 7-7
Fuser Error
LaserJet
LaserJet 4P/4MP
4L/4ML LEDs Display Panel
I
Description & Recommendations
El
\m
ND
fg=
C)m
Ready and Er-
ror lights are on
and all others
are off.
50 SERVICE 1. Remove power to the printer for 15
minutes. If this doesn’t clear the error:
2. Perform the Fuser Checks shown in the
table below.
3. Check the Fuses (FU101 and FU201) on
the DC Controller PCA. Replace if faulty.
3. Replace the DC Controller PCA.
1
Table 7-8 Fuser Checks
SUSPECT. I
CHECK
I
1. Connector Contact Ensure that J103 and J204 connectors on the Fusing
Assembly are seated securely into the DC Controller
PCA connectors (see Figure 6-29 in Chapter 6 for
locations). Reseat the Fusing Assembly,
2. Thermistor wire open.
Remove the Fuser and measure the resistance
between connectors J204-1 and J204-2 (see
Figure 6-29 in Chapter 6 for location), Resistance
should read approximately 440 K Ohms at 20 Deg C
(room temperature). If the thermistor wire is open,
replace the Fusing Assembly.
3. Thermal Fuse.
Measure the continuity between connectors JI 03-1
and J103-2 on the Fuser (see Figure 6-29, Chapter 6
for location). It should be approximately 29 Ohms. If
the thermal fuse is open, replace the Fusing Assembly
7-12
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