FS-9120DN/9520DN
2-1-16
2-1-7 Fuser section
The fuser section consists of the parts shown in Figure 2-1-20. When paper reaches the fuser section after the transfer
process, it passes between the press roller and heat roller, which is heated by fuser heaters M or S (FH-M or FH-S).
Pressure is applied by the fuser unit pressure springs so that the toner on the paper is melted, fused and fixed onto the
paper. The heat roller is heated by fuser heaters M or S (FH-M or FH-S) inside it; its surface temperature is detected by
the fuser unit thermistor (FTH) and is regulated by the fuser heaters turning on and off.
If the fuser section becomes abnormally hot, fuser unit thermostat (FTS) operates shutting the power to the fuser heaters
off. When the fuser process is completed, the paper is separated from the heat roller by its separation claws and is
conveyed from the printer to eject and switchback section.
Figure 2-1-20 Fuser section
FH-M
FH-S
FTS
FH-M REM
FH-S REM
YC1-6
YC1-5
EPWB
YC10-A6
YC10-A5
YC10-A10
YC10-A9
FTH1
5 V DC
FTH2
5 V DC
FTH1
FTH2
YC5-1
YC5-3
YC5-2
PSU
YC2-3
YC2-4
Heat roller
ILSW
Figure 2-1-21 Fuser section block diagram
1 Upper fuser unit cover
2 Fuser housing
3 Heat roller
4 Heat roller separation claw
5 Fuser heater M (FH-M)
6 Fuser heater S (FH-S)
7 Fuser unit thermostat (FTS)
8 Fuser unit thermistor 1 (FTH1)
9 Fuser unit thermistor 2 (FTH2)
0 Press roller
! Press roller separation claw