Panasonic KX-MC6020RU / KX-FAP317A / KX-FAB318A Service Manual ▷ View online
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KX-MC6020RU
6.15. LCD Section
The Gate Array (IC201) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplied for the LCD drive.
R118 and R117 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC201).
R118 and R117 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC201).
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KX-MC6020RU
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-U34pin. The
heat lamp is turned on/off by the HTRCTL signal (IC600-G17pin) through the photo triac (PC2) and the triac (CR001). And two
thermostats are set on the AC line as the safety devices.
heat lamp is turned on/off by the HTRCTL signal (IC600-G17pin) through the photo triac (PC2) and the triac (CR001). 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 and BK motor.
b. After that, control at the Detection Temperature 1 (147
b. After that, control at the Detection Temperature 1 (147
°C), and turn ON the color motor.
c. After that, control at the Detection Temperature 2 (162
°C), and print process start.
d. After that, control at the Fuser temperature A (160~188
°C), and feed papers in a fuser unit.
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KX-MC6020RU
100
KX-MC6020RU
2. Safety Protection
a. 2 thermostats are provided with the Fuser unit, and the heater circuit is shut down when their surface temperatures
becomes over 180
°C.
b. When the temperature becomes over 205
°C, The heater control circuit of IC300 has the built-in function that the software
turns off the heater control automatically. (The detection temperature takes place every 10msec.)
c. When the Fuser unit can not be controlled by the software and the temperature becomes over 210
°C, the heater control
circuit of IC600 should be stopped forcibly by the hardware (IC830).
The correspondence readings between temperature measured by thermistor and HEX readings
Temperature
(
°C
)
AD Value (DEC) HEX reading Temperature
(
°C
)
AD Value (DEC)
HEX reading
Temperature
(
°C
)
AD Value (DEC) HEX reading
-20
255
FF
25
248
F8
52
234
EA
-10
254
FE
26
247
F7
53
234
EA
0
253
FD
27
247
F7
54
233
E9
1
253
FD
28
247
F7
55
232
E8
2
253
FD
29
246
F6
56
231
E7
3
253
FD
30
246
F6
57
231
E7
4
253
FD
31
246
F6
58
230
E6
5
252
FC
32
245
F5
59
229
E5
6
252
FC
33
245
F5
60
228
E4
7
252
FC
34
244
F4
61
227
E3
8
252
FC
35
244
F4
62
226
E2
9
252
FC
36
244
F4
63
225
E1
10
252
FC
37
243
F3
64
225
E1
11
251
FB
38
243
F3
65
224
E0
12
251
FB
39
242
F2
66
223
DF
13
251
FB
40
242
F2
67
222
DE
14
251
FB
41
241
F1
68
221
DD
15
251
FB
42
241
F1
69
220
DC
16
250
FA
43
240
F0
70
219
DB
17
250
FA
44
239
EF
71
218
DA
18
250
FA
45
239
EF
72
217
D9
19
250
FA
46
238
EE
73
216
D8
20
249
F9
47
238
EE
74
214
D6
21
249
F9
48
237
ED
75
213
D5
22
249
F9
49
236
EC
76
212
D4
23
248
F8
50
236
EC
77
211
D3
24
248
F8
51
235
EB
78
210
D2
79
209
D1
137
122
7A
195
53
35
80
208
D0
138
120
78
196
52
34
81
206
CE
139
119
77
197
51
33
82
205
CD
140
117
75
198
50
32
83
204
CC
141
116
74
199
50
32
84
203
CB
142
114
72
200
49
31
85
201
C9
143
113
71
201
48
30
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