Samsung SF 5100, Service Manual, Page: 63 / 192

Samsung Electronics 5-23
Maintenance & Troubleshooting
After printing
completed, any error
related fuser?
Both ends
of thermostat
open?
Replace thermostat
and re-test
Replace the contol
component on engine
board
Check any contact
problem in thermistor
and repair
The machine
placed under the
severe low tempera
ture for a long
time?
Place the machine
at normal
temperature and
re-test
While printing,
the voltage of pin 208
of U5 (CPU) on Main
board is 2.0V
~2.3V?
Thermistor’s
contact is OK?
Open the top
cover. When black
printing, is the fuser NIP
width is 1.2~
3.0mm?
The paper used is too
thick or contains too
much cotton in it
-> Re-test with the
recommended paper
Check if the hardness of
P/R, and spring force is OK?
(spring’s force: 2.5 Kg)
Re-assemble
thermistor
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Poor Fusing Grade