19. Malfunction code Field Service Ver. 1.0 Aug. 2005
244
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Troubleshooting
19.3.18 C3851: Low Fuser Temperature Failure (Main)
19.3.19 C3852: Low Fuser Temperature Failure (Sub)
Relevant Electrical Parts
Fusing Roller Heater Lamp (H1)
Fusing Roller Sub Heater Lamp (H2)
Fusing Roller Thermistor (TH1)
Fusing Roller Sub Thermistor (TH2)
Mechanical Control Board (PWB-A)
Power Supply Unit (PU1)
Step Action
WIRING DIAGRAM
Control Signal
Location
(Electrical
Component)
1
Check that the H1 comes on when the Right-Side
Door is opened, then closed, and correct or replace
as necessary.
--
2
Check that the H2 comes on when the Right-Side
Door is opened, then closed, and correct or replace
as necessary.
--
3
Check the installation of the TH1 and the TH2, and
correct or clean as necessary.
--
4
Check the operation of the TH1.
Remove CN80 (4P), and then check that the resis-
tance across CN80-2 and -3 on the Thermistor is
infinity.
--
5
Check the operation of the TH2.
Remove CN81 (4P), and then check that the resis-
tance across CN81-2 and -3 on the Thermistor is
infinity.
--
6
Check the continuity of the H1.
Correct or replace as necessary.
--
7
Check the continuity of the H2.
Correct or replace as necessary.
--
8 Change PU1 - -
9 Change PWB-A - -
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