Olivetti d-Copia 300, Service Manual

Page: 294 / 351

2FD/2FF/2FG
2-1-20
2-1-7 Fixing section
The fixing section consists of the parts shown in Figure 2-1-24. When paper reaches the fixing section after the transfer
process, it passes between the press roller and heat roller, which is heated by fixing heaters M or S (FH-M or FH-S).
Pressure is applied by the fixing unit pressure springs so that the toner on the paper is melted, fused and fixed onto the
paper. The heat roller is heated by fixing heaters M or S (FH-M or FH-S) inside it; its surface temperature is detected by
the fixing unit thermistor 1 and 2 (FTH1,2), and is regulated by the fixing heaters turning on and off.
If the fixing section becomes abnormally hot, fixing unit thermostat (FTS) operates shutting the power to the fixing
heaters off. When the fixing process is completed, the paper is separated from the heat roller by its separation claws and
is conveyed from the copier to eject and switchback section.
Figure 2-1-24 Fixing section
FH-M FH-S
FTS
FH-M REM FH-S REM
YC1-6 YC1-5
MPCB
YC10-A6 YC10-A5
FTH1
5 V DC
YC10-A10
YC10-A9
FTH2
5 V DC
FTH1
FTH2
CN5-1
CN5-3
CN5-2
PSPCB
CN2-1 CN2-2
Heat roller
ILSW
Figure 2-1-25 Fixing section block diagram
1
Upper fixing unit cover
2
Fixing housing
3
Heat roller
4
Heat roller separation claw
5
Fixing heater M (FH-M)
6
Fixing heater S (FH-S)
7
Fixing unit thermostat (FTS)
8
Fixing unit thermistor 1 (FTH1)
9
Fixing unit thermistor 2 (FTH2)
0
Press roller
!
Press roller separation claw