TX-SR402/8240/HT-R420
ADJUSTMENT PROCEDURES
IDLING CURRENT ADJUSTMENT
P6903
J6011
J6008
JL6803A
JL6804A
J6014
J6016
J6153J6136J6110J6073
J6052
J6053
J6106
J6107
J6129
J6130
J6150
J6151
P6011
D6903
D6904
J6081
J6080
J6064
J6065
RL6901
RL6901
RL6902
RL6902
P6931
P931
J
L
6
9
5
2
A
JL6951A
J6060
J6061
J6076
J6077
J6058
J6023
J6022
J6079
J6082
J6063
J6062
Q6603
R6603
Q6602
D6906
Q6901
C6920
J6004
R6902
D6706
D6705
C6708
D6901
C6903
D6902
C6904C6905
R6904
R6905
C6906
C6907
R6706
C6704
D6703
R6704
Q6703
R6702
C6703
J6085
R6513
R6851
R6523
J6164
C6513
C6523
R6701
AGND
+24V
MPUGND
MPUGND
VOLH
SE1H
+13VS
SPB
SPCS
SPF
POWER
PRO
J6101
J6099
J6100
J6026
J6042
J6102
J6103
J6056
R6850
F6901A F6901B
F6902B
F6902A
J6040
J6059
J6025
J6024
+13VS
+13VS
MPUGND
MPUGND
POWER
P6907
+B1
-B1
-B1
+B1
J6086
P6909
F6901
F6902
8A 125V
R6521R6511
C6511
C6512
R6512 R6522
C6522
J6138
J6143
J6031
J6033
J6034
J6029 J6087
J6092
J6091
J6089 J6119
J6121
J6116
J6114
J6160
J6161
J6168
HPL
HPR
J6167
C6510
C6520
R6510
R6520
RLGND
J6084
J6140
J6030
J6074 J6118
J6137
J6159
J6155
J6125
J6133
J6112
J6097J6038
J6057
C6521
J6015 J6075 J6113 J6139
J6152
J6149
J6148
J6131
J6126
J6127
J6134
J6105
J6104
J6109
J6108J6054
J6055
J6049
J6050
J6071J6027
J6010
J6009
J6013
J6012
J6093
J6094
J6095
J6122
J6123
J6124
J6144
J6145
J6146
J6035
J6036
J6037
J6163
J6165
J6166
E
E
B
E
B
R6708
NCAF-7875
25137875A
J6170
1
J6002
J6001
J6018
J6019
J6017
J6039
J010
R6100
Q6050 Q6060
J6032 J6051
R6101
Q6051 Q6061
J6090 J6096
R6102
Q6052 Q6062
J6120 J6128
R6103
Q6053 Q6063
J6142 J6147
R6104
Q6054 Q6064
J6162
J6169
J6045
J6047
R6605
J6005
J6006
P6922
P6923
J6067
J6066
J6044
J6046
J6007
R6230
R6231
R6234
R6232
R6233
C6230
C6231
C6232
C6233
C6234
J6043
+24V
CSRLD
FRLD
BRLD
Q6601
R6601
J011
J011AJ010A
J6111 J6132 J6154
J6083
J6020
J6041
J6003
J6021
P6072A
J6068
C6706
D6704
R6710
R6709
C6701
JL6805A
Q6701
D6702
Q6702
D6701
Q6303
D6307
D6306
R6306
R6307
R6308
P6301
J6069
J6070
JL6402A
COM
TH1
+24V
+24V
TH1
LSP
RSP
CSP
LSSP
RSSP
LSPE
RSPE
CSPE
LSSPE
RSSPE
R6604
R6602
B
B
B
E
E
P6802
E
E
E
B
B
B
J6098
J6078
L
R C LS RS
P995A
P997A
P996A
P6906
P6801
C6902
C6902
C6901
C6901
P995B
J6156
B-
B+
+B1
-B1
NF
P6004
B-
B+
+B1
-B1
NF
P6003
B-
B+
+B1
-B1
NF
P6002
B-
B+
+B1
-B1
NF
P6001
B-
B+
+B1
-B1
NF
P6000
P6073A
BE
Q6010
R6080
ID-
R6140
BE
Q6070
R6150
C6050
J6048
B
B
ID+
Q6040
Q6030
R6070
C6040
R6030
R6050
Q6020
P6080
D6000
R6160
R6180
R6170
R6020
E
E
E
BIAS
R6090
B
R6000
R6010
J6028
BE
Q6013
R6083
ID-
R6143
BE
Q6073
R6153
C6053
J6141
B
B
ID+
Q6043
Q6033
R6073
C6043
R6033
R6043
R6053
Q6023
P6083
D6003
R6163
R6183
R6173
R6023
E
E
E
BIAS
R6093
B
R6003
R6013
J6135
BE
Q6012
R6082
ID-
R6142
BE
Q6072
R6152
C6052
J6117
B
B
ID+
Q6042
Q6032
R6072
C6042
R6032
R6042
R6052
Q6022
P6082
D6002
R6162
R6182
R6172
R6022
E
E
E
BIAS
R6092
B
R6002
R6012
J6115
BE
Q6011
R6081
ID-
R6141
BE
Q6071
R6151
C6051
J6088
B
B
ID+
Q6041
Q6031
R6071
C6041
R6031
R6041
R6051
Q6021
P6081
D6001
R6161
R6181
R6171
R6021
E
E
E
BIAS
R6091
B
R6001
R6011
J6072
BE
Q6014
R6084
ID-
R6144
BE
Q6074
R6154
C6054
J6158
B
B
ID+
Q6044
Q6034
R6074
C6044
R6034
R6054
Q6024
P6084
D6004
R6164
R6184
R6174
R6024
E
E
E
BIAS
R6094
B
R6004
R6014
J6157
P6908
P6910
R6190 R6191 R6192 R6193 R6194
D6014
D6013D6012D6011D6010
C6908
C6909
BCEBCEBCEBCEBCEBCEBCEBCEBCEBCE
25 25 25 25 25
1717
12
12
25252525
12
12
12
12
12
12
12
12
30
27
30
30
7
7
15
15
7
20
20
15
15
25
25
30
7
12
7
7
7
7
25
27
17
20
17
30
30
17
30
30
17
30
30
17
30
30
17
30
30
17
20
17
20
20
2020
20
20
1717
20
20
30
15
17
7
7
20
20 25 25 25 25
20 20 20 12121212
22
15
12
22
22
1230 12
22
22
22 22
22
22
1230 30 12
22
22
22
17
17
20
30
30
15
25
27
22
7
77 7 7
30
25
12
27
22
12
20
22
12
7
R6040 R6044
R6040 P6080
ID+ ID-
Trimming
resistor
Test
point
L
BIAS
R6041 P6081
ID+ ID-
Trimming
resistor
Test
point
R
BIAS
R6042 P6082
ID+ ID-
Trimming
resistor
Test
point
C
BIAS
R6043 P6083
ID+ ID-
Trimming
resistor
Test
point
LS
BIAS
R6044 P6084
ID+ ID-
Trimming
resistor
Test
point
RS
BIAS
U17
POWER AMPLIFIER PCB ASSY
(NAAF-7875)
Front side
Fig-1
[Note] No load and No signal
Refer to Fig-1 about test points and adjustment points.
1. Before Idling adjustment, turn the trimming resistors R6040, R6041, R6042, R6043 and R6044 to counter clockwise.
2. Connect the DC voltmeter to test point P6080,P6081, P6082, P6083 and P6084.
Connect 100-ohm resistance near the terminal of the two poles of a Jig terminal.
6. Wait for 4 - 5 minutes. (Heat raining)
7. Re-adjust the trimming resistors as following procedure.
Trimming resistor
(Adjustment point)
R6040
R6041
R6042
R6043
R6044
Adjustment value
2.5 mV
2.5 mV
2.5 mV
1.5 mV
1.5 mV
Test point
(Measuring point)
P6080
P6081
P6082
P6083
P6084
Adjustment point
R6040, R6041, R6042
R6043, R6044
Adjustment value
7 mV
Leave it as it is
9 mV
4 mV
Leave it as it is
6 mV
Measured value
In case below 7 mV
In case 7 - 9 mV
In case over 9 mV
In case below 4 mV
In case 4 - 6 mV
In case over 6 mV
3. Connect the AC power supply cord to wall outlet.
4. Press the STANDBY/ON button into the power ON state.
5. Adjust the trimming resistors as following procedure immediately after a power ON.
Channel
L
R
C
SL
SR
Channel
L, R, C
SL, SR
ID+
ID-
Test point
DC voltmeter
Jig terminal
Resistor
100 ohms
1/4watts
8. Disconnect the DC voltmeter.
9. Press the STANDBY/ON button into the power OFF state.
10. Disconnect the AC power supply cord.
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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