Canon PC720 Service Manual - Page 87

Canon PC720 Manual

Get Canon PC720 PDF manuals and user guides View all Canon PC720 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 87 highlights

OPERATIONS AND TIMING= 2. Controlling the Temperature of the Fixing Heater The copier keeps the fixing heater off while in standby state, and starts supplying the fixing heater with power when the Copy Start key is pressed. The control temperature for the fixing heater is determined in response to the first press on the Copy Start key after power-on. The control temperature for the fixing heater is determined by the temperature of the fixing heater (value of main thermistor TH1) and the number of copies to be made in continuous mode. The control temperature of the fixing heater is determined by any of the following three ways according to the type of developing assembly (black or color). The copier keeps track of the number of copies made until the power is turned off or the auto shutoff mechanism (about 5 min) is activated, during which time the effective control temperature will not be changed. a. Black Developing Assembly Heater temperature at first press on Copy Start key after power-on 1 Lower than 100°C 2 100°C or higher and less than 120°C 3 120°C or higher Copies 1 to 9 10 to 14 15 to 19 20 to 24 25 to 29 30 or more 1 to 9 10 to 14 15 to 19 20 or more 1 to 9 10 or more Table 3-401 Control temperature 215°C 210°C 205°C 200°C 195°C 190°C 205°C 200°C 195°C 190°C 195°C 190°C COPYRIGHT O 1994 CANONINC. CANON PC72017401750177R0EY.0 AUG.1994 PRINTEDIN JAPAN(imPRRIEAUJAPON) 3 - 47

  • 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
OPERATIONS
AND
TIMING=
2.
Controlling
the
Temperature
of
the
Fixing
Heater
The
copier
keeps
the
fixing
heater
off
while
in
standby
state,
and
starts
supplying
the
fixing
heater
with
power
when
the
Copy
Start
key
is
pressed.
The
control
temperature
for
the
fixing
heater
is
determined
in
response
to
the
first
press
on
the
Copy
Start
key
after
power
-on.
The
control
temperature
for
the
fixing
heater
is
determined
by
the
temperature
of
the
fixing
heater
(value
of
main
thermistor
TH1)
and
the
number
of
copies
to
be
made
in
continuous
mode.
The
control
temperature
of
the
fixing
heater
is
determined
by
any
of
the
following
three
ways
according
to
the
type
of
developing
assembly
(black
or
color).
The
copier
keeps
track
of
the
number
of
copies
made
until
the
power
is
turned
off
or
the
auto
shutoff
mechanism
(about
5
min)
is
activated,
during
which
time
the
effective
control
tem-
perature
will
not
be
changed.
a.
Black
Developing
Assembly
Heater
temperature
at
first
press
on
Copy
Start
key
after
power
-on
Copies
Control
temperature
1
Lower
than
100°C
1
to
9
215°C
10
to
14
210°C
15
to
19
205°C
20
to
24
200°C
25
to
29
195°C
30
or
more
190°C
2
100°C
or
higher
and
less
than
120°C
1
to
9
205°C
10
to
14
200°C
15
to
19
195°C
20
or
more
190°C
3
120°C
or
higher
1
to
9
195°C
10
or
more
190°C
Table
3-401
COPYRIGHT
O
1994
CANON
INC.
CANON PC720174017501770
REY.0
AUG.1994
PRINTED
IN
JAPAN
(imPRRIE
AU
JAPON)
3
-
47