HP LaserJet Enterprise M552 - Page 51

Figure 1-7 Fuser components
TH2
TH3
TH1
TP1
H1, H2
Fuser heater safety
circuit
Fuser film
Pressure roller
FUSER TEMPERATURE signal
FUSER HEATER CONTROL signal
DC controller
Fuser heater control
circuit
Fuser power supply
TH
2
TH
3
TH
1
TP
1
H
1,
H2
Fuser heater sa
f
et
y
c
ir
cu
i
t
F
use
r
f
ilm
Pr
essu
r
e
r
o
ll
e
r
FU
S
ER TEMPERATURE si
g
nal
FU
S
ER HEATER
CO
NTR
O
L si
g
nal
D
C
controller
F
use
r h
ea
t
e
r
co
ntr
o
l
c
ir
cu
i
t
Fuser power suppl
y
Table 1-11 Fuser components
Type of component Abbreviation Name Function
Heaters H1 Fuser main heater Heats the center of the fuser sleeve
H2 Fuser sub-heater Heats the edge of the fuser sleeve
Thermistors
(Contact type)
TH1 Main thermistor Detects the center temperature of
the fuser heater
TH2 Sub-thermistor 1 Detects the temperature at one end
of the fuser heater
ENWW Engine-control system 23