4-20
Samsung Electronics
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 5
of U5 on engine
board is about
2.7V?
Thermistor’s
contact is OK?
Open the top
cover. When black
printing, is the fuser NIP
width is 3.0-
3.5mm?
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?
(hardness: 24 degree,
spring’s force: 3 Kg)
Re-assemble
thermistor
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Poor Fusing Grade
Summary of Contents for Msys 6750
Page 10: ...2 6 Samsung Electronics Specification Memo ...
Page 58: ...4 28 Samsung Electronics Maintenance Troubleshooting MEMO ...
Page 81: ...5 22 Samsung Electronics Exploded Views and Parts Lists MEMO ...
Page 95: ...MEMO Samsung Electronics 8 2 ...
Page 96: ...PCB Diagrams Samsung Electronics 9 1 9 1 Main PCB Diagram Top 9 PCB Diagrams ...
Page 97: ...PCB Diagrams Samsung Electronics 9 2 9 2 Main PCB Diagram Bottom ...
Page 98: ...PCB Diagrams Samsung Electronics 9 3 9 3 LIU PCB Diagram Top 9 4 LIU PCB Diagram Bottom ...
Page 99: ...PCB Diagrams Samsung Electronics 9 4 9 5 Engine PCB Diagram Top ...
Page 100: ...PCB Diagrams Samsung Electronics 9 5 Engine PCB Diagram Top ...
Page 101: ...PCB Diagrams Samsung Electronics 9 6 9 6 Engine PCB Diagram Bottom ...
Page 102: ...PCB Diagrams Samsung Electronics 9 7 Engine PCB Diagram Bottom ...
Page 103: ...PCB Diagrams Samsung Electronics 9 8 9 7 OPE PCB Diagram ...
Page 104: ...PCB Diagrams Samsung Electronics 9 9 OPE PCB Diagram ...
Page 105: ...PCB Diagrams Samsung Electronics 9 10 MEMO ...
Page 106: ...Connection diagram Samsung Electronics 8 1 8 Connection diagram ...
Page 107: ...MEMO Samsung Electronics 8 2 ...
Page 110: ...Main Circuit Diagram 3 5 Samsung Electronics 10 3 Schematic Diagrams ...
Page 111: ...Schematic Diagrams 10 4 Samsung Electronics Main Circuit Diagram 4 5 ...
Page 113: ...Schematic Diagrams 10 6 Samsung Electronics 10 2 Engine Circuit Diagram 1 4 ...
Page 114: ...Engine Circuit Diagram 2 4 Samsung Electronics 10 7 Schematic Diagrams ...
Page 115: ...Schematic Diagrams 10 8 Samsung Electronics Engine Circuit Diagram 3 4 ...
Page 116: ...Engine Circuit Diagram 4 4 Samsung Electronics 10 9 Schematic Diagrams ...
Page 117: ...Schematic Diagrams 10 10 Samsung Electronics 10 3 LIU Circuit Diagram ...