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4-2-12 Poor Fusing Grade
After printing
completed, any error
related fuser?
YES
Both ends
of thermostat
open?
YES
Replace thermostat
and re-test.
Replace the contol
component on engine
board.
Check any contact
problem in thermistor
and repair.
Samsung Electronics
The machine
NO
placed under the
severe low tempera-
ture for a long
time?
YES
Place the machine
NO
at normal
temperature and
re-test.
While printing,
NO
the voltage of pin 52
of U4 (CPU) on engine
board is 2.7V
- 3.0V?
YES
Open the top
cover. When black
printing, is the fuser NIP
width is 3.0-
3.5mm?
YES
The paper used is too
thick or contains too
much cotton in it.
-> Re-test with the
recommended paper.
NO
Thermistor's
contact is OK?
YES
Re-assemble
thermistor.
Check if the hardness of
NO
P/R, and spring force is OK?
(hardness: 24 degree,
spring's force: 3 Kg)
Troubleshooting
NO
4-11
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