Panasonic KX-MB763RU (serv.man13) Service Manual ▷ View online
53
KX-MB763RU
6.16. HEAT LAMP CONTROL CIRCUIT
The temperature of the fixing part of the Fuser Unit is converted to a voltage by THERMISTOR and input to IC300-D19pin. The
heat lamp is turned on/off by the HTRCTL signal (IC300-AD19pin) through the photo triac (PC2) and the triac (SCR51). And two
thermostats are set on the AC line as the safety devices.
heat lamp is turned on/off by the HTRCTL signal (IC300-AD19pin) through the photo triac (PC2) and the triac (SCR51). 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 (170
b. After that, turn ON the motor at the Primary Stable Temperature (170
°C).
c. After that, control at the Secondary Stable temperature (195
°C/200°C), and feed papers.
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KX-MB763RU
55
KX-MB763RU
2. Safety Protection
a. 2 thermostats are provided with the unit, and the heater circuit is shut down when their surface temperatures became over
160
°C.
b. The heater control circuit of IC300 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 250
°C, the heater control circuit of IC300 is turned off forcedly and system reset
(IC300 AC18 pin 125 becomes Low) will be executed.
The correspondence readings between temperature measured by thermistor and HEX readings
Temperature
[C
°]
AD value
HEX reading
Temperature
[C
°]
AD value
HEX reading
Temperature
[C
°]
AD value
HEX reading
0 252
FC
84 202
CA
168
93
5D
1 251
FB
85 200
C8
169
92
5C
2 251
FB
86 199
C7
170
91
5B
3 251
FB
87 198
C6
171
90
5A
4 251
FB
88 197
C5
172
89
59
5 251
FB
89 196
C4
173
88
58
6 251
FB
90 195
C3
174
87
57
7 250
FA
91 193
C1
175
86
56
8 250
FA
92 192
C0
176
85
55
9 250
FA
93 191
BF
177
84
54
10 250
FA
94 190
BE
178 83
53
11 249
F9
95 188
BC
179
82
52
12 249
F9
96 187
BB
180 81
51
13 249
F9
97 186
BA
181 80
50
14 249
F9
98 184
B8
182 79
4F
15 248
F8
99 183
B7
183 78
4E
16 248
F8
100 182
B6
184 77
4D
17 248
F8
101 181
B5
185 76
4C
18 248
F8
102 179
B3
186 75
4B
19 247
F7
103 178
B2
187 74
4A
20 247
F7
104 177
B1
188 74
4A
21 247
F7
105 175
AF
189 73
49
22 246
F6
106 174
AE
190 72
48
23 246
F6
107 173
AD
191 71
47
24 246
F6
108 171
AB
192 70
46
25 245
F5
109 170
AA
193 69
45
26 245
F5
110 168
A8
194 68
44
27 245
F5
111 167
A7
195 68
44
28 244
F4
112 166
A6
196 67
43
29 244
F4
113 164
A4
197 66
42
30 243
F3
114 163
A3
198 65
41
31 243
F3
115 162
A2
199 64
40
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KX-MB763RU
Note:
The value is displayed on LCD at TEST FUNCTIONS (P.80) [#815].
32 243
F3
116 160
A0
200 64
40
33 242
F2
117 159
9F
201 63
3F
34 242
F2
118 157
9D
202 62
3E
35 241
F1
119 156
9C
203 61
3D
36 241
F1
120 155
9B
204 61
3D
37 240
F0
121 153
99
205 60
3C
38 240
F0
122 152
98
206 59
3B
39 239
EF
123 151
97
207 58
3A
40 239
EF
124 149
95
208 58
3A
41 238
EE
125 148
94
209 57
39
42 238
EE
126 146
92
210 56
38
43 237
ED
127 145
91
211 56
38
44 236
EC
128 144
90
212 55
37
45 236
EC
129 142
8E
213 54
36
46 235
EB
130 141
8D
214 54
36
47 235
EB
131 139
8B
215 53
35
48 234
EA
132 138
8A
216 52
34
49 233
E9
133 137
89
217 52
34
50 233
E9
134 135
87
218 51
33
51 232
E8
135 134
86
219 50
32
52 231
E7
136 133
85
220 50
32
53 231
E7
137 131
83
221 49
31
54 230
E6
138 130
82
222 49
31
55 229
E5
139 129
81
223 48
30
56 228
E4
140 127
7F
224 48
30
57 228
E4
141 126
7E
225 47
2F
58 227
E3
142 125
7D
226 46
2E
59 226
E2
143 123
7B
227 46
2E
60 225
E1
144 122
7A
228 45
2D
61 224
E0
145 121
79
229 45
2D
62 224
E0
146 120
78
230 44
2C
63 223
DF
147 118
76
231 44
2C
64 222
DE
148 117
75
232 43
2B
65 221
DD
149 116
74
233 43
2B
66 220
DC
150 114
72
234 42
2A
67 219
DB
151 113
71
235 42
2A
68 218
DA
152 112
70
236 41
29
69 217
D9
153 111
6F
237 41
29
70 216
D8
154 109
6D
238 40
28
71 215
D7
155 108
6C
239 40
28
72 214
D6
156 107
6B
240 39
27
73 213
D5
157 106
6A
241 39
27
74 212
D4
158 105
69
242 38
26
75 211
D3
159 103
67
243 38
26
76 210
D2
160 102
66
244 37
25
77 209
D1
161 101
65
245 37
25
78 208
D0
162 100
64
246 37
25
79 207
CF
163 99
63
247 36
24
80 206
CE
164 98
62
248 36
24
81 205
CD
165 97
61
249 35
23
82 204
CC
166 96
60
250 35
23
83 203
CB
167 94
5E
Temperature
[C
°]
AD value
HEX reading
Temperature
[C
°]
AD value
HEX reading
Temperature
[C
°]
AD value
HEX reading
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