,.
‘“ -
SF-77~
SF–77W
[13] FUSER
1. General
UNIT
description
Thermostat
\
tirmal fuse
rnermostatresetswitch
\
Sta
P
A. Heat rollersand cleaningroller.
A te~ fi~ is used for the upper heat d~ and a WM rotler
is used for the lowerheat roller.
The lowercleaningrolleris impregnatedwithsil~ oilto ~aae
thecleaningeffiienvt aawell*pml~9iW~e life~f~r~~~:
B. Separatorpawls.
Four separatorPSMSare used for the upper heat dler and three
f~ the Wer heat roller.The upperseparatorpawlsare -M.wti
Teflon to red- fridon with the rdi=.
C. Temperaturemntrol.
@
Temperatureof the fuaerunitis mtrolH,by meansof a heater
lamp in mjution with the thermistor,main - @ic, and
noise fiRerPWB Qic (SSR), and the tdac.
A thermostatand a thm ties are used to preventharm to
the m~hine in -e of an irregu~y hgh temperafum.
Safetydevia (thermostat,
thermalfuse)
c
Heateri~P
I
I
1
I
U~r heatrollersum
temperaturemon~orad@ the
thermistw.
I
I
1
1
1
I
I
Triacis turned on and off by
the
signalh ti manPWB.
I
n
I
SSR
(Mse
1
rtkerPWB)
\
@ Theupperheat rollersurfa~femparSfureia~ttol~degmsc.
@ The machinesself diagnoatimwill d~ay a statusde when
a fuaer mdfutiion ~ra.
a. When the heat roller surface temperaturerose above 2~
degrees C. H3 displayed.
b; When the heat rollersurfa~ temperaturedroppedbelowla
degrees C (H2 is displayed)or did not rise to IW degrees
~:
C withinW
~. (H4.is display~).
c. Open thermistor(l)
H2is displayed.
d. Open therrnd fuae(lW°C)(*l)
e. Open thermostat(17~) mnta(?)
NOW (*1) : To repla~ mmponent partstic. oral. above,remove
the dlert nut besidetie pem withoutlooeenin9me
relay harness.
NOTE (02) : If the the
~t ~fa- are open, push the reset
buttonon the top of the thermostatto menualv reset.
It does notrestoreautomatih.
D. Majorpartsreplacementperiod
@
Upper and w heat rollers:Ev~ s0,000 @es
@ Lowerheat rollerdeanim roller:Evw W,m ~pies
@ Thermistorcleaningdk: Evw ~,~ copies
@
Upparaparatorpawls:Everym,~@es (poaitiontobashiff~
atevery4,ti counts)
@ Lowerseparatorpaws: EveryW,m copies.
2. Major patis replacement
A.Lowerheatrollercleaning
roller
@
Remove the paper exit guideaaay.
@ Remove the tier heat rolkr,cleeniflgrollerfromthe paper exit
guide.
Q
●
~ heatrollercleaningrolk
/
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P- exit~uideassY
13-1
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