Panasonic KX-FL423RU Service Manual ▷ View online
53
KX-FL423RU-B / KX-FL423RU-W
6.16. Heat Lamp Control Circuit
The temperature of the fixing part of the Fixing Unit is converted to a voltage by THERMISTOR and input to IC106-4pin. The
heater turns ON/OFF the photo-coupler PC2 at the heater control port (IC106-29pin), and is turned ON/OFF at the triac SCR1.
And two thermostats are set on the AC line as the safety devices.
heater turns ON/OFF the photo-coupler PC2 at the heater control port (IC106-29pin), and is turned ON/OFF at the triac SCR1.
And two thermostats are set on the AC line as the safety devices.
1. Control at Printing
a. After the printing signal is received, turn ON the heater.
b. After that, turn ON the motor at the Primary Stable Temperature (130
b. After that, turn ON the motor at the Primary Stable Temperature (130
°C).
c. After that, control at the Secondary Stable temperature (160
°C), N/N(25 - 30°C), and feed papers.
54
KX-FL423RU-B / KX-FL423RU-W
Refer to Call Service Troubleshooting Guide (P.138)
55
KX-FL423RU-B / KX-FL423RU-W
2. Safety Protection
a. 2 thermostats are provided with the unit, and the heater circuit is shut down when their surface temperatures became over
200
°C.
b. The heater control circuit of IC101 has the built-in function that the software turns off the heater control automatically if the
heater is not turned ON every a fixed time.
c. When the temperature became over 220
°C, the heater control circuit of IC101 is turned off forcedly and system reset
(IC106 pin 20 becomes Low) will be executed.
The correspondence readings between temperature measured by thermistor and HEX readings
Temperature(
°C)
HEX reading
Temperature(
°C)
HEX reading
Temperature(
°C)
HEX reading
-40
F9
16
6D
72
17
-39
F8
17
6B
73
17
-38
F6
18
68
74
16
-37
F5
19
65
75
15
-36
F3
20
63
76
15
-35
F2
21
60
77
14
-34
F0
22
5E
78
14
-33
EF
23
5B
79
13
-32
ED
24
59
80
12
-31
EB
25
57
81
12
-30
E9
26
55
82
11
-29
E7
27
52
83
11
-28
E5
28
50
84
11
-27
E3
29
4E
85
10
-26
E1
30
4C
86
10
-25
DF
31
4A
87
0F
-24
DD
32
48
88
0F
-23
DB
33
46
89
0E
-22
D8
34
44
90
0E
-21
D6
35
42
91
0E
-20
D4
36
40
92
0D
-19
D1
37
3F
93
0D
-18
CF
38
3D
94
0D
-17
CC
39
3B
95
0C
-16
CA
40
3A
96
0C
-15
C7
41
38
97
0C
-14
C4
42
36
98
0B
-13
C1
43
35
99
0B
-12
BF
44
33
100
0B
-11
BC
45
32
101
0A
-10
B9
46
31
102
0A
-9
B6
47
2F
103
0A
-8
B3
48
2E
104
0A
56
KX-FL423RU-B / KX-FL423RU-W
Note:
The value is displayed on LCD at Test Functions (P.75) [#815].
The correspondence readings between temperature measured by fixing thermistor and HEX readings
-7
B0
49
2D
105
9
-6
AD
50
2B
106
9
-5
AA
51
2A
107
9
-4
A7
52
29
108
9
-3
A4
53
28
109
8
-2
A1
54
27
110
8
-1
9E
55
26
111
8
0
9B
56
25
112
8
1
98
57
23
113
7
2
95
58
22
114
7
3
92
59
22
115
7
4
8F
60
21
116
7
5
8C
61
20
117
7
6
89
62
1F
118
6
7
87
63
1E
119
6
8
84
64
1D
120
6
9
81
65
1C
121
6
10
7E
66
1B
122
6
11
7B
67
1B
123
6
12
78
68
1A
124
5
13
75
69
19
125
5
14
73
70
18
15
70
71
18
Temperature(
°C)
HEX Reading
Temperature(
°C)
HEX Reading
Temperature(
°C)
HEX Reading
0
F9
84
EA
168
86
1
F9
85
E9
169
84
2
F9
86
E9
170
82
3
F9
87
E8
171
81
4
F9
88
E7
172
7F
5
F9
89
E7
173
7D
6
F9
90
E6
174
7B
7
F9
91
E6
175
7A
8
F9
92
E5
176
78
9
F9
93
E4
177
76
10
F9
94
E4
178
74
11
F9
95
E3
179
73
12
F9
96
E2
180
71
13
F9
97
E2
181
6F
14
F9
98
E1
182
6D
15
F9
99
E0
183
6C
16
F8
100
DF
184
6A
17
F8
101
DF
185
68
18
F8
102
DE
186
66
19
F8
103
DD
187
65
20
F8
104
DC
188
63
21
F8
105
DC
189
61
Temperature(
°C)
HEX reading
Temperature(
°C)
HEX reading
Temperature(
°C)
HEX reading
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