Panasonic KX-MC6020RU / KX-FAP317A / KX-FAB318A Service Manual ▷ View online
101
KX-MC6020RU
Note:
The value is displayed on LCD at Test Functions (P.149) [#815].
86
200
C8
144
111
6F
202
47
2F
87
199
C7
145
110
6E
203
47
2F
88
197
C5
146
108
6C
204
46
2E
89
196
C4
147
107
6B
205
45
2D
90
195
C3
148
105
69
206
45
2D
91
193
C1
149
104
68
207
44
2C
92
192
C0
150
102
66
208
43
2B
93
191
BF
151
101
65
209
43
2B
94
189
BD
152
100
64
210
42
2A
95
188
BC
153
98
62
211
41
29
96
186
BA
154
97
61
212
41
29
97
185
B9
155
96
60
213
40
28
98
183
B7
156
94
5E
214
39
27
99
182
B6
157
93
5D
215
39
27
100
180
B4
158
92
5C
216
38
26
101
179
B3
159
90
5A
217
38
26
102
177
B1
160
89
59
218
37
25
103
176
B0
161
88
58
219
37
25
104
174
AE
162
86
56
220
36
24
105
173
AD
163
85
55
221
35
23
106
171
AB
164
84
54
222
35
23
107
170
AA
165
83
53
223
34
22
108
168
A8
166
82
52
224
34
22
109
166
A6
167
80
50
225
33
21
110
165
A5
168
79
4F
226
33
21
111
163
A3
169
78
4E
227
32
20
112
162
A2
170
77
4D
228
32
20
113
160
A0
171
76
4C
229
31
1F
114
158
9E
172
75
4B
230
31
1F
115
157
9D
173
73
49
231
31
1F
116
155
9B
174
72
48
232
30
1E
117
154
9A
175
71
47
233
30
1E
118
152
98
176
70
46
234
29
1D
119
150
96
177
69
45
235
29
1D
120
149
95
178
68
44
236
28
1C
121
147
93
179
67
43
237
28
1C
122
146
92
180
66
42
238
28
1C
123
144
90
181
65
41
239
27
1B
124
142
8E
182
64
40
240
27
1B
125
141
8D
183
63
3F
241
26
1A
126
139
8B
184
62
3E
242
26
1A
127
137
89
185
61
3D
243
26
1A
128
136
88
186
60
3C
244
25
19
129
134
86
187
59
3B
245
25
19
130
133
85
188
59
3B
246
25
19
131
131
83
189
58
3A
247
24
18
132
130
82
190
57
39
248
24
18
133
128
80
191
56
38
249
24
18
134
126
7E
192
55
37
250
23
17
135
125
7D
193
54
36
136
123
7B
194
53
35
Temperature
(
°C
)
AD Value (DEC) HEX reading Temperature
(
°C
)
AD Value (DEC)
HEX reading
Temperature
(
°C
)
AD Value (DEC) HEX reading
102
KX-MC6020RU
6.17. HVU (High Voltage Power Supply Board) Section
6.17.1. High Voltage Circuit
This board outputs 12 high voltages used for electronic photographic process. The 12 voltages consists of 2 charge ( VCH/YMC,
VCH/K : -1001V ~ -1405V ) for color (YMC) OPC and black OPC, 4 development bias ( VB/Y, VB/M, VB/C, VB/K : DC -100V ~ -
300V + AC400V
VCH/K : -1001V ~ -1405V ) for color (YMC) OPC and black OPC, 4 development bias ( VB/Y, VB/M, VB/C, VB/K : DC -100V ~ -
300V + AC400V
p-p
) for each color, 4 supply bias ( VSR/Y, VSR/M, VSR/C, VSR/K : -200V ~ -400V), FTR bias ( FTR : 0V ~ 1800V
), STR bias ( STR : 0 ~ 5000V ). The Charge, Development bias, FTR Bias and STR Bias voltages are varied by the D/A converter
setting data from the main board. If the signal HVEN is a low, 2 Charge, 4 Development Bias, 4 Supply Bias, FTR Bias and STR
Bias voltages are generated. Each of the high voltages are specifically set depending on the print media, selected resolution, print-
ing mode, duplicate mode, and humidity/temperature range of the room. The humidity and temperature are detected by a humidity
sensor.
setting data from the main board. If the signal HVEN is a low, 2 Charge, 4 Development Bias, 4 Supply Bias, FTR Bias and STR
Bias voltages are generated. Each of the high voltages are specifically set depending on the print media, selected resolution, print-
ing mode, duplicate mode, and humidity/temperature range of the room. The humidity and temperature are detected by a humidity
sensor.
6.17.2. Charge Control Circuit
This circuit consists of a DC-DC converter, which boosts +24V to approximately -1001V ~ -1405V for the charge bias (maximum
current rating 50
current rating 50
µA for each color). This circuit has 2 boost circuits (VCH/YMC : Color, VCH/K : Black). The VCH/YMC and
VCH/K voltages are controlled individually by the D/A converter circuit on the high voltage board.
OUTPUT
VCH/K
VCH/YMC
VB (K.C.Y.M)
VB(+)
CONTROL METHOD
C.V.
C.V.
C.V. (AC+DC)
ZD
NOMINAL OUTPUT VOLTAGE
-1203V±24V
-1203V±24V
AC:400V[P-P]±50V[P-P]
(When 800Hz)
DC:-200V±10V
(When 800Hz)
DC:-200V±10V
200V±25V
NOMINAL LOAD
40M
Ω
13.3M
Ω
200
p
F//100M
Ω
10G
Ω
LOAD AREA
24M
Ω ~
10G
Ω
8M
Ω ~
10G
Ω
---
---
OUTPUT VOLTAGE RANGE
-1001V±20V~ -1405V±28V -1001V±20V~ -1405V±28V DC:-100V±10V~ -300±10V ---
OUTPUT CONTROL
DAC
DAC
AC: Fix
DC:DAC
DC:DAC
Fix
OUTPUT
VSR (K.C.Y.M)
VSR(+)
FTR
STR(+)
STR(-)
CONTROL METHOD
VB(-)+ZD
---
C.V.
CC/0V
ZD
NOMINAL OUTPUT VOLT-
AGE
AGE
-300V±20V
200V±25V
597V±30V
CC 10
µA±0.6µA
0V mode
0V±100V
(VCHK= min when
setting)
0V±100V
(VCHK= min when
setting)
-500V±50V
(VCHK= min when
setting)
(VCHK= min when
setting)
NOMINAL LOAD
100M
Ω
10G
Ω
10G
Ω
CC 150M
Ω
500M
Ω
LOAD AREA
---
---
---
500V ~ 5000V
---
OUTPUT VOLTAGE
RANGE
RANGE
-200V±20V~ -
400V±20V
400V±20V
---
0V±20V~
1800±50V
1800±50V
CC 1.5
µ A ~100µA ---
OUTPUT CONTROL
DAC
Fix
DAC
DAC
Fix
103
KX-MC6020RU
6.17.3. Development Bias Control Circuit
This circuits of a DC-DC converter and a DC-AC converter. The DC-DC converter boosts +24V to approximately -100 ~ -300V
for the development bias. The DC-AC converter adds the rectangular AC voltage to development bias. AC frequency value is
approximately 800/1000 Hz that is determined by the external clock signal SCLKHV from IC300 (ASIC) on the main board. The
development bias control circuit has 4 boost circuits (VB/Y : yellow development bias, VB/M : magenta development bias, VB/C
: cyan development bias, VB/K : black development bias). The VB/Y, VB/M, VB/C and VB/K development bias voltages are con-
trolled individually by the D/A converter circuit on the high voltage board.
for the development bias. The DC-AC converter adds the rectangular AC voltage to development bias. AC frequency value is
approximately 800/1000 Hz that is determined by the external clock signal SCLKHV from IC300 (ASIC) on the main board. The
development bias control circuit has 4 boost circuits (VB/Y : yellow development bias, VB/M : magenta development bias, VB/C
: cyan development bias, VB/K : black development bias). The VB/Y, VB/M, VB/C and VB/K development bias voltages are con-
trolled individually by the D/A converter circuit on the high voltage board.
6.17.4. Toner Supply Bias Control Circuit
This circuit is coupled with the development bias control circuit, which outputs 4 toner supply bias voltages (VSR/Y : yellow color, VSR/M :
magenta color, VSR/C : cyan color, VSR/K : black color ). The voltage value is approximately 100V (lower than the development DC bias value).
magenta color, VSR/C : cyan color, VSR/K : black color ). The voltage value is approximately 100V (lower than the development DC bias value).
6.17.5. First Transfer Control Circuit ( FTR )
This circuit consists of a DC-DC converter, which boosts +24V to approximately 0 ~ 1800V for the first transfer bias (maximum
current rating 90
current rating 90
µA). This voltage value is controlled by the D/A converter circuit on the high voltage board.
104
KX-MC6020RU
6.17.6. Second Transfer Control Circuit (STR)
This circuit consists of a DC-DC converter, which boosts +24V to approximately 0 ~ 5000V for the second transfer bias (maxi-
mum current rating 100
mum current rating 100
µA). This voltage value is controlled by the D/A converter circuit on the high voltage board.
6.17.7. Reverse Bias Control Circuit
The high voltage board has 3 reverse bias control circuits : Development Bias VB(+), Toner Supply Bias VSR(+), Second Trans-
fer Bias STR(-).
VB(+) [ approximately 50 ~ 220V ] is generated from the charge bias voltage VCH/YMC by the coupling Zener diode on the high
voltage board.
VSR(+) is coupled with the development reverse bias VB(+).
STR(-) [ approximately 0 ~ -700V ] is generated from the charge bias voltage VCH/K by the coupling Zener diode on the high
voltage board.
fer Bias STR(-).
VB(+) [ approximately 50 ~ 220V ] is generated from the charge bias voltage VCH/YMC by the coupling Zener diode on the high
voltage board.
VSR(+) is coupled with the development reverse bias VB(+).
STR(-) [ approximately 0 ~ -700V ] is generated from the charge bias voltage VCH/K by the coupling Zener diode on the high
voltage board.
6.17.8. Charger Error Detecting Circuit
If the current is over maximum current rating, the signal HVERR becomes a high. The error message “CALL SERVICE 6“ is dis-
played on the LCD display. (Refer to CALL SERVICE 6 (P.188)
played on the LCD display. (Refer to CALL SERVICE 6 (P.188)
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