Canon PC770 Service Manual - Page 36

Separation, Fixing

Get Canon PC770 PDF manuals and user guides View all Canon PC770 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 36 highlights

MI COPYING PROCESS G. Separation (step 5) H. Fixing (step 6) Copy paper O Fixing heater Thermistor Fixing film Toner Static eliminator Figure 2-112 Copy paper is separated from the photosensitive drum using the rigidity of the paper. Thin paper, however, has low rigidity and can wrap around the photosensitive drum. To prevent such a problem, the copier applies a positive voltage to the separation static eliminator to weaken the static attraction between the photosensitive drum and copy paper, thereby facilitating separation. Pressure roller Copy paper Figure 2-113 After transfer, the toner image is fixed to the paper while the copy paper moves through the fixing film and the pressure roller. The fixing film has a seamless construction and is made of special material so that melting toner will not stick to the film-this is why the copier's fixing assembly does not have a cleaning mechanism. The fixing heater is a flat heater and heats only the area where the fixing film comes into contact; this design eliminates the need for warm-up time. The temperature of the fixing heater is monitored by the thermistor (TH1) located more or less at the center of the fixing heater and serves to make sure that the heater is controlled to a specific temperature. 2 - 6 COPYRIGHT © 1994 CANON INC. CANON PC720,740/750i770 REY.0 AUG.1994 PRINTEDIN JAPAN DIARIME AU JAPON)

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
MI
COPYING
PROCESS
G.
Separation
(step
5)
O
Copy
paper
Static
eliminator
Figure
2-112
Copy
paper
is
separated
from
the
photo-
sensitive
drum
using
the
rigidity
of
the
paper.
Thin
paper,
however,
has
low
rigidity
and
can
wrap
around
the
photosensitive
drum.
To
prevent
such
a
problem,
the
copier
applies
a
positive
voltage
to
the
separation
static
eliminator
to
weaken
the
static
attrac-
tion
between
the
photosensitive
drum
and
copy
paper,
thereby
facilitating
separation.
H.
Fixing
(step
6)
Thermistor
Fixing
film
Fixing
heater
Toner
Copy
paper
Pressure
roller
Figure
2-113
After
transfer,
the
toner
image
is
fixed
to
the
paper
while
the
copy
paper
moves
through
the
fixing
film
and
the
pressure
roller.
The
fixing
film
has
a
seamless
construc-
tion
and
is
made
of
special
material
so
that
melting
toner
will
not
stick
to
the
film
—this
is
why
the
copier's
fixing
assembly
does
not
have
a
cleaning
mechanism.
The
fixing
heater
is
a
flat
heater
and
heats
only
the
area
where
the
fixing
film
comes
into
contact;
this
design
eliminates
the
need
for
warm-up
time.
The
temperature
of
the
fixing
heater
is
monitored
by
the
thermistor
(TH1)
located
more
or
less
at
the
center
of
the
fixing
heater
and
serves
to
make
sure
that
the
heater
is
controlled
to
a
specific
temperature.
2
-
6
COPYRIGHT
©
1994
CANON
INC.
CANON
PC720,740/750i770
REY.0
AUG.1994
PRINTED
IN
JAPAN
DIARIME
AU
JAPON)