Poor Fusing Grade - Samsung ML-920 Service Manual

Poor Fusing Grade

NO
After printing
completed, any error
related fuser?
YES
Both ends
NO
of thermostat
open?
YES
Replace thermostat
and re-test
Replace the control
component on Main
PBA
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
at normal
temperature and
re-test
While printing,
NO
the voltage of pin 60
of U51 (CPU) on Main
PBA is 2.1V
- 2.6V?
YES
Open the top
cover. When black NO
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
Troubleshooting
NO
Thermistor's
contact is OK?
YES
Re-assemble
thermistor
Check if the hardness of
P/R, and spring force is OK?
(hardness: 24 degree,
spring's force: 3 Kg)
4-30