C3851: Low Fuser Temperature Failure (Main); C3852: Low Fuser Temperature Failure (Sub) - Konica Minolta bizhub 250 Service Manual

19. Malfunction code
19.3.18

C3851: Low Fuser Temperature Failure (Main)

19.3.19

C3852: Low Fuser Temperature Failure (Sub)

Fusing Roller Heater Lamp (H1)
Fusing Roller Sub Heater Lamp (H2)
Fusing Roller Thermistor (TH1)
Fusing Roller Sub Thermistor (TH2)
Step
Check that the H1 comes on when the Right-Side
1 Door is opened, then closed, and correct or replace
as necessary.
Check that the H2 comes on when the Right-Side
2 Door is opened, then closed, and correct or replace
as necessary.
Check the installation of the TH1 and the TH2, and
3
correct or clean as necessary.
Check the operation of the TH1.
Remove CN80 (4P), and then check that the resis-
4
tance across CN80-2 and -3 on the Thermistor is
infinity.
Check the operation of the TH2.
Remove CN81 (4P), and then check that the resis-
5
tance across CN81-2 and -3 on the Thermistor is
infinity.
Check the continuity of the H1.
6
Correct or replace as necessary.
Check the continuity of the H2.
7
Correct or replace as necessary.
8 Change PU1
9 Change PWB-A
244
EDNord - Istedgade 37A - 9000 Aalborg - telefon 96333500
Relevant Electrical Parts
Mechanical Control Board (PWB-A)
Power Supply Unit (PU1)
Action
Field Service Ver. 1.0 Aug. 2005
WIRING DIAGRAM
Location
Control Signal (Electrical
Component)
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