Panasonic DP-MB545 / DP-MB537 / DP-MB536 / DA-FAP109 / DA-FAP110 Service Manual ▷ View online
101
DP-MB545/537/536 series
6.18. Heat Lamp Control Circuit
1. Heater control sequence at printing mode
a. After receiving printing data, HEATER turns on.
b. When heater temperature reaches to the Primary Temperature, Main motor starts to rotate for initializing printer engine.
c. When heater temperature reaches to the Secondary Temperature, the printing starts.
b. When heater temperature reaches to the Primary Temperature, Main motor starts to rotate for initializing printer engine.
c. When heater temperature reaches to the Secondary Temperature, the printing starts.
2. Circuit summary
• The temperature of the fixing part of the FUSER Unit is converted to a Voltage by THERMISTOR1 and input to IC300_pinC4,
THERMISTOR2 and input to IC300_pinC3.
• The heat lamp is turned on/off by the HTRCTL signals (IC300_pinD13/ IC300_pinC13) through the photo triac(PHT1/PHT2) and
the triac(CR1/CR2).
• Two thermostats are provided on the AC line as the safety protection devices.
• Overheat protection circuit is provided so as to prevent the Fuser unit from overheating when CPU cannot control Fuser by any
• Overheat protection circuit is provided so as to prevent the Fuser unit from overheating when CPU cannot control Fuser by any
problem.
IC505 compares thermistor voltage(FUSER1_TEMP) and predetermined voltage, which is determined by 3.3V, R580 and R581.
If FUSER1_TEMP voltage becomes lower than this predetermined voltage, output of IC505_pin1 becomes "H", then Q523 turns
ON.
Once Q523 turns on, IC505_pin1 keeps "H" even after FUSER1_TEMP voltage becomes bigger than the voltage of IC505_pin3.
And when IC505_pin1 keeps "H", Q520 turn off.
IC505 compares thermistor voltage(FUSER2_TEMP) and predetermined voltage, which is determined by 3.3V, R6600 and
R661.
If FUSER2_TEMP voltage becomes lower than this predetermined voltage, output of IC505_pin7 becomes "H", then Q655 turns
ON.
Once Q655 turns on, IC505_pin7 keeps "H" even after FUSER2_TEMP voltage becomes bigger than the voltage of IC505_pin5.
And when IC505_pin7 keeps "H", Q656 turn off.
As the result, once Fuser temperature exceed 240°C (this temperature is abnormal condition), no current is supplied to Fuser
lamp.
IC505 compares thermistor voltage(FUSER1_TEMP) and predetermined voltage, which is determined by 3.3V, R580 and R581.
If FUSER1_TEMP voltage becomes lower than this predetermined voltage, output of IC505_pin1 becomes "H", then Q523 turns
ON.
Once Q523 turns on, IC505_pin1 keeps "H" even after FUSER1_TEMP voltage becomes bigger than the voltage of IC505_pin3.
And when IC505_pin1 keeps "H", Q520 turn off.
IC505 compares thermistor voltage(FUSER2_TEMP) and predetermined voltage, which is determined by 3.3V, R6600 and
R661.
If FUSER2_TEMP voltage becomes lower than this predetermined voltage, output of IC505_pin7 becomes "H", then Q655 turns
ON.
Once Q655 turns on, IC505_pin7 keeps "H" even after FUSER2_TEMP voltage becomes bigger than the voltage of IC505_pin5.
And when IC505_pin7 keeps "H", Q656 turn off.
As the result, once Fuser temperature exceed 240°C (this temperature is abnormal condition), no current is supplied to Fuser
lamp.
• Watch dog error circuit is provided so as to prevent the heater keeps ON in case of software run.
In normal mode, software toggles IC300-D1pin, then IC500-4pin becomes "L" and HTRCTL1 signal gets across to Q519, and
HTRCTL2 signal gets across to Q657.
If the lock of software happens, this toggle operation becomes impossible, then IC500-4pin becomes "H" and Q536 turns on.
It forces Q519 and Q657 to turn off regardless of software operation.
HTRCTL2 signal gets across to Q657.
If the lock of software happens, this toggle operation becomes impossible, then IC500-4pin becomes "H" and Q536 turns on.
It forces Q519 and Q657 to turn off regardless of software operation.
CN101
1
2
CN1
CN2
CN3
Low Voltage Power Supply
THERMOSTAT 1
HEAT LAMP 1 (for Center area)
HEAT LAMP 2 (for End area)
THERMOSTAT 2
AC ( L )
AC IN
AC ( N )
CN20
CN21
2
4
1
2
2
4
5
FUSER RELAY BOARD
MAIN BOARD
+3.3V
R559
C510
R547
+3.3V
R548
C518
R549
IC300
C4
C3
D13
C13
D1
2
4
5
A. Heater Control Circuit
THERMISTOR 1
THERMISTOR 2
B. Temperature Detection Circuit
C. Wire Harness & Connector
D. Thermistor
E. Thermostat
+
-
+
-
FUSER1_TEMP
001:2A;003:4E
+3.3V
Q519
2.2k
47k
+3.3V
+3.3V
Q525
+24VB
Q536
4.7k
47k
B
C
E
HTRCTL1
001:4C
P7V
PWRDWN1
001:4B
Q518
4.7k
4.7k
B
C
E
Q523
C509
C507
C520
R58
0
5
7
5
R
8
7
5
R
7
7
5
R
k
6
5
5
8
5
R
6
6
5
R
R553
R550
HWD
001:2B;003:6D;004:2D
R551
Q517
4.7k
4.7k
B
C
E
R581
3
6
6
R
9
5
6
R
HWD 001:2B;003:6C;004:2D
2
6
6
R
C659
+3.3V
FUSER2_TEMP
001:2A;003:4E
R668
Q653
4.7k
47k
B
C
E
Q657
2.2k
47k
R660
HTRCTL2
001:4C
R669
+3.3V
C661
Q655
7
6
6
R
R661
IC505
5
6
7
R670
ZCROSS
001:4B
R658
+3.3V
S3.3V
IC505
3
2
1
IC505
4
GND
8
VCC
C523
+24VB
R586
R657
Q520
47k
47k
Q656
47k
47k
C550
R567
0
7
5
R
C551
C559
C56
0
CN508
1
2
3
4
5
6
7
8
F500
C562
R540
001:2B;003:6C;003:6D
HWD
C505
R542
D502
001:2A
HTRWDCTL
D504
IC500
2
4
C542
102
DP-MB545/537/536 series
Chart of Temperature and Time
103
DP-MB545/537/536 series
3. The correspondence between temperature at heat roller (center & edge area) and HEX reading on LCD
You can read the AD value of heater temperature in service mode.
Press the keys [MENU][#][9][0][0][0][*][8][1][5].
Press the keys [MENU][#][9][0][0][0][*][8][1][5].
HEX and Roller Temperature table
Note:
The value is displayed on LCD at Test Functions (P.119) [#815].
Temper-
ature
(°C)
Voltage
Value
(V)
HEX
reading
Temper-
ature
(°C)
Voltage
Value
(V)
HEX
reading
Temper-
ature
(°C)
Voltage
Value
(V)
HEX
reading
Temper-
ature
(°C)
Voltage
Value
(V)
HEX
reading
Temper-
ature
(°C)
Voltage
Value
(V)
HEX
reading
-30
3.29
FF
27
3.16
F5
84
2.61
CA
141
1.63
7E
198
0.85
41
-29
3.29
FF
28
3.15
F4
85
2.59
C8
142
1.61
7D
199
0.84
40
-28
3.29
FE
29
3.15
F4
86
2.58
C7
143
1.60
7B
200
0.83
40
-27
3.29
FE
30
3.14
F3
87
2.56
C6
144
1.58
7A
201
0.82
3F
-26
3.28
FE
31
3.14
F3
88
2.55
C5
145
1.56
79
202
0.81
3E
-25
3.28
FE
32
3.13
F3
89
2.53
C4
146
1.55
78
203
0.80
3D
-24
3.28
FE
33
3.13
F2
90
2.51
C3
147
1.53
76
204
0.79
3D
-23
3.28
FE
34
3.12
F2
91
2.50
C1
148
1.51
75
205
0.78
3C
-22
3.28
FE
35
3.12
F1
92
2.48
C0
149
1.50
74
206
0.77
3B
-21
3.28
FE
36
3.11
F1
93
2.47
BF
150
1.48
72
207
0.76
3A
-20
3.28
FE
37
3.1
F0
94
2.45
BE
151
1.47
71
208
0.75
3A
-19
3.28
FE
38
3.1
F0
95
2.43
BC
152
1.45
70
209
0.74
39
-18
3.28
FE
39
3.09
EF
96
2.42
BB
153
1.43
6F
210
0.73
38
-17
3.28
FE
40
3.08
EF
97
2.40
BA
154
1.42
6D
211
0.72
38
-16
3.28
FE
41
3.08
EE
98
2.38
B8
155
1.40
6C
212
0.71
37
-15
3.27
FE
42
3.07
EE
99
2.37
B7
156
1.39
6B
213
0.71
36
-14
3.27
FD
43
3.06
ED
100
2.35
B6
157
1.37
6A
214
0.70
36
-13
3.27
FD
44
3.05
EC
101
2.33
B5
158
1.36
69
215
0.69
35
-12
3.27
FD
45
3.05
EC
102
2.32
B3
159
1.34
67
216
0.68
34
-11
3.27
FD
46
3.04
EB
103
2.30
B2
160
1.33
66
217
0.67
34
-10
3.27
FD
47
3.03
EB
104
2.28
B1
161
1.31
65
218
0.67
33
-9
3.27
FD
48
3.02
EA
105
2.27
AF
162
1.30
64
219
0.66
32
-8
3.26
FD
49
3.01
E9
106
2.25
AE
163
1.28
63
220
0.65
32
-7
3.26
FD
50
3.01
E9
107
2.23
AD
164
1.27
62
221
0.64
31
-6
3.26
FD
51
3.00
E8
108
2.21
AB
165
1.25
61
222
0.63
31
-5
3.26
FC
52
2.99
E7
109
2.20
AA
166
1.24
60
223
0.63
30
-4
3.26
FC
53
2.98
E7
110
2.18
A8
167
1.22
5E
224
0.62
30
-3
3.26
FC
54
2.97
E6
111
2.16
A7
168
1.21
5D
225
0.61
2F
-2
3.25
FC
55
2.96
E5
112
2.14
A6
169
1.20
5C
226
0.60
2E
-1
3.25
FC
56
2.95
E4
113
2.13
A4
170
1.18
5B
227
0.60
2E
0
3.25
FC
57
2.94
E4
114
2.11
A3
171
1.17
5A
228
0.59
2D
1
3.25
FB
58
2.93
E3
115
2.09
A2
172
1.15
59
229
0.58
2D
2
3.25
FB
59
2.92
E2
116
2.07
A0
173
1.14
58
230
0.58
2C
3
3.24
FB
60
2.91
E1
117
2.05
9F
174
1.13
57
231
0.57
2C
4
3.24
FB
61
2.90
E0
118
2.04
9D
175
1.11
56
232
0.56
2B
5
3.24
FB
62
2.89
E0
119
2.02
9C
176
1.10
55
233
0.56
2B
6
3.24
FB
63
2.88
DF
120
2.00
9B
177
1.09
54
234
0.55
2A
7
3.23
FA
64
2.87
DE
121
1.98
99
178
1.08
53
235
0.54
2A
8
3.23
FA
65
2.86
DD
122
1.96
98
179
1.06
52
236
0.54
29
9
3.23
FA
66
2.84
DC
123
1.95
97
180
1.05
51
237
0.53
29
10
3.23
FA
67
2.83
DB
124
1.93
95
181
1.04
50
238
0.53
28
11
3.22
F9
68
2.82
DA
125
1.91
94
182
1.03
4F
239
0.52
28
12
3.22
F9
69
2.81
D9
126
1.89
92
183
1.01
4E
240
0.51
27
13
3.22
F9
70
2.80
D8
127
1.88
91
184
1.00
4D
241
0.51
27
14
3.21
F9
71
2.78
D7
128
1.86
90
185
0.99
4C
242
0.50
26
15
3.21
F8
72
2.77
D6
129
1.84
8E
186
0.98
4B
243
0.50
26
16
3.21
F8
73
2.76
D5
130
1.82
8D
187
0.97
4A
244
0.49
25
17
3.20
F8
74
2.75
D4
131
1.80
8B
188
0.95
4A
245
0.48
25
18
3.20
F8
75
2.73
D3
132
1.79
8A
189
0.94
49
246
0.48
25
19
3.19
F7
76
2.72
D2
133
1.77
89
190
0.93
48
247
0.47
24
20
3.19
F7
77
2.70
D1
134
1.75
87
191
0.92
47
248
0.47
24
21
3.19
F7
78
2.69
D0
135
1.73
86
192
0.91
46
249
0.46
23
22
3.18
F6
79
2.68
CF
136
1.72
85
193
0.90
45
250
0.46
23
23
3.18
F6
80
2.66
CE
137
1.70
83
194
0.89
44
24
3.17
F6
81
2.65
CD
138
1.68
82
195
0.88
44
25
3.17
F5
82
2.63
CC
139
1.67
81
196
0.87
43
26
3.16
F5
83
2.62
CB
140
1.65
7F
197
0.86
42
104
DP-MB545/537/536 series
4. The correspondence between room temperature/humidity and HEX reading on LCD
You can read the AD value of room temperature.
Press the keys [MENU][#][9][0][0][0][*][8][1][5].
Press the keys [MENU][#][9][0][0][0][*][8][1][5].
HEX and Room Temperature table
You can read the AD value of room humidity.
Press the keys [MENU][#][9][0][0][0][*][8][2][3].
Press the keys [MENU][#][9][0][0][0][*][8][2][3].
Hex and Room Humidity table
Temp.
(°C)
HEX
reading
Temp.
(°C)
HEX
reading
-20
EC
15
0F
-19
ED
16
10
-18
EE
17
11
-17
EF
18
12
-16
F0
19
13
-15
F1
20
14
-14
F2
21
15
-13
F3
22
16
-12
F4
23
17
-11
F5
24
18
-10
F6
25
19
-9
F7
26
1A
-8
F8
27
1B
-7
F9
28
1C
-6
FA
29
1D
-5
FB
30
1E
-4
FC
31
1F
-3
FD
32
20
-2
FE
33
21
-1
FF
34
22
0
00
35
23
1
01
36
24
2
02
37
25
3
03
38
26
4
04
39
27
5
05
40
28
6
06
41
29
7
07
42
2A
8
08
43
2B
9
09
44
2C
10
0A
45
2D
11
0B
46
2E
12
0C
47
2F
13
0D
48
30
14
0E
49
31
Humidity
(%)
HEX
reading
Humidity
(%)
HEX
reading
Humidity
(%)
HEX
reading
0
00
34
22
68
44
1
01
35
23
69
45
2
02
36
24
70
46
3
03
37
25
71
47
4
04
38
26
72
48
5
05
39
27
73
49
6
06
40
28
74
4A
7
07
41
29
75
4B
8
08
42
2A
76
4C
9
09
43
2B
77
4D
10
0A
44
2C
78
4E
11
0B
45
2D
79
4F
12
0C
46
2E
80
50
13
0D
47
2F
81
51
14
0E
48
30
82
52
15
0F
49
31
83
53
16
10
50
32
84
54
17
11
51
33
85
55
18
12
52
34
86
56
19
13
53
35
87
57
20
14
54
36
88
58
21
15
55
37
89
59
22
16
56
38
90
5A
23
17
57
39
91
5B
24
18
58
3A
92
5C
25
19
59
3B
93
5D
26
1A
60
3C
94
5E
27
1B
61
3D
95
5F
28
1C
62
3E
96
60
29
1D
63
3F
97
61
30
1E
64
40
98
62
31
1F
65
41
99
63
32
20
66
42
100
64
33
21
67
43
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