ADJUSTMENT PROCEDURES
IDLING CURRENT ADJUSTMENT
TX-SR502/E/8250/HT-R520
R6183
R6182
C6901
C6901
C6902
C6902
J6008
JL6803D
JL6804A
P6011
R6706
C6704
D6703
R6704
Q6703
R6702
C6703
R6701
THPRO
AGND
RLGND
VOLH
SE1H
+13VS
SPB
SPCS
SPF
POWER
PRO
J6108
J6110
J6111
+B1
-B1
HPL
HPR
MPUGND
R6708
NCAF-8245
25138245A
1
J010
J6071
P6922
P6923
R6235
R6230
R6233
R6232
R6231
C6234
C6233
C6232
C6231
C6230
J011
P6073A
C6706
D6704
R6710
R6709
C6701
Q6701
D6702
Q6702
D6701
Q6303
D6307
D6306
R6306
R6307
R6308
P6301
J6067
JL6402A
COM
TH1
TH2
TH1
+24V
LSP
RSP
CSP
LSSP
RSSP
LSPE
RSPE
CSPE
LSSPE
RSSPE
SL
SR
C6235
R6234
P6072A
SBSPE
SB
SBSP
+24V
ID-ID+
NF
-B1
+B1
B+
B-
ID-ID+
NF
-B1
+B1
B+
B-
ID-ID+
NF
-B1
+B1
B+
B-
ID-ID+
NF
-B1
+B1
B+
B-
ID-ID+
NF
-B1
+B1
B+
B-
NF
-B1
+B1
B+
B-
J6066
J010A
J011A
P6931
R6981
R6980
J6175 J6178
J6179
J6031
J6032
J6053
J6054
J6092
J6093
J6094
J6095
J6128
J6129
J6130
J6131
J6150
J6151
J6159
J6160 J6176
J6185
J6184
J6183
J6181
J6182
J6189
J6188
J6190
J6186
J6187
R6145
R6035
R6005
R6015
R6165
R6175
R6185
R6155
R6055
Q6075
Q6045
Q6035
Q6025
Q6015
J6165
J6166
J6172J6161
J6171
J6170
J6162
J6163
J6152
J6158
J6174
J6168
J6169
R6014
R6004
R6034
R6144
R6054
R6184
R6164
R6174
R6154
Q6014
Q6024
Q6074
Q6044
Q6034
R6143
R6013
R6003
R6033
R6153
R6173
R6163
R6053
J6141
J6132
J6145
J6148
J6147
J6140
J6143
J6144
J6136
J6139
J6137
J6133
J6134
J6146
Q6033
Q6043
Q6013
Q6073
Q6023
R6103
R6193
D6003
D6013
R6093
R6083
R6073
C6043
C6044
C6045
C6042C6041C6040
P6083
P6084
P6085
P6082
P6081
P6080
P6003
P6004
P6005
P6002
P6001
P6000
R6043
R6044
R6045
R6041
R6085
R6095
R6075
R6105R6104R6102R6101R6100
R6195
D6005
D6004
D6002
D6001
D6000
D6015
R6084
R6094
R6080
R6090
R6091
R6074
R6072
R6071
R6070
R6194
D6014
J6099
J6122 J6123
J6119
J6120
J6112
J6127J6117
J6097 J6121
J6125
J6115J6113
J6114
R6192
R6092
R6082
R6012
R6002
R6032
R6142J6116
R6172
R6162
R6152
R6052
Q6012
Q6022
Q6072
J6126
Q6042
Q6032
J6074
J6059
J6060
J6075
J6055
J6080
J6089
J6073
J6079
J6078
J6076
J6058
R6191
R6141
R6031
R6001
R6011
Q6011
Q6031
R6081
J6090
D6011
Q6071
Q6021
R6171
R6161
R6181 R6151
R6051
Q6041
D6010
Q6040
Q6010
J6025
J6022
J6033
J6009 J6028
J6027
J6013 J6030
J6024
J6014
R6030
R6000
R6010
R6140
R6150
R6190
J6048
Q6020
Q6070
Q6030
R6170
R6160
R6180
R6050
J6026
D6012
J6180
J6153 J6177
J6138 J6149 J6164 J6173
J6135
J6098
J6118
J6096
J6091
J6077
J6072
J6050
J6057
J6052
J6051
J6056
J6049
J6029
J6023
J6010
J6011
J6012
J6005
J6006
J6007
MPUGND
R6317
J6124
Q6313
J6109
J6020
J6088
R6318
D6714
C6716
R6719
J6157
J6156
J6154
J6142
J6155
J6103
J6102
J6064
J6065
RL6901
RL6901
RL6902
RL6902
P931
JL6952A
J
L
6
9
5
1
A
J6083
J6084
J6085
J6086
J6081
J6063
J6062
Q6603
R6603
Q6602
D6906
Q6901
C6920
J6019
R6902
D6706
D6705
C6708
D6901
C6903
D6902
C6904
C6905
R6904 R6905
C6906
C6907
J6107
J6044
J6045
F6901A
F6901B
F6902B
F6902A
J6037
J6082
J6042
+13VS
+13VS
MPUGND
MPUGND
POWER
P6907
P6909
F6901
F6902
10A 125V
E
E
B
J6015
J6034
R6605
J6002
J6003
+24V
CSRLD
FRLD
BRLD
Q6601
R6601
JL6805A
R6604
R6602
B
B
B
E
E
J6101
J6100
P995CC
P995BB
P6906
P6910
J6004
P6983
P6981
C
R
L
TH2
EEEEEEBBBBBB
B
B
B
BE
E
E
E
E
E
E
EB
B
B
B
B
B
B
BE
E
E
E
E
E
E
E
B
B
B
B
B
B
B
B
B
B
B
B
E
E
E
E
E
E
E
E
EB
BE
E
EE
B
B
B
Q6065
Q6055
Q6062
Q6052
Q6061
Q6051
Q6060
Q6050
Q6064
Q6054
Q6063
Q6053
C6055
P6903
C6054
C6050
C6051
C6052
J6191
C6053
J6167
C6909
C6908
J6069
J6070
J6040
J6041
J6104
J6087
J6068
J6046
J6038
J6043
J6017
J6001 J6018
J6036J6016
J6105
R6020
R6021
R6022
R6023
R6024
R6025
J
L
6
8
0
3
A
LSP
RSP
CSP
LSSP
RSSP
SBSP
P6982
P
9
9
5
A
A
J6106
J6061
-B1
+B1
BLU
RED
BLK
J6192
J6035
J6047
D6904 D6903
BCEBCEBCEBCEBCEBCEBCEBCE BCEBCEBCEBCE
25
7
25
25
12 27
27
27
27
27
27
25
25
12
12
25
25 12
20
17
17
17
15
121720
17
17
12
12
22
25
15
17
17
17
15
17
15
15
12
12
20
17
17
25
2215
20 17
12
27
25
17
20
20
12
25
22
17
17
15
20
20 17
17
15 22
17
20 20
15 22 15 25
20
12
17
17
20
20
22
17
17
15
15
17
17
27
30
27
30
30
7
7
15
15
7
30
7
7
7
20
20
25
30
7
30
15
22
20
12
12
25
30
27
20
30
7
12
2217
12
12
12
12
15
15
7
15
25
25
20
25
ID-ID+
R6042
R6040
Front side
Fig-1
R6043
P6083
ID+ ID-
Trimming
resistor
Test
point
SL
Mark
R6044
P6084
ID+ ID-
Trimming
resistor
Test
point
SR
Mark
R6045
P6085
ID+ ID-
Trimming
resistor
Test
point
SB
Mark
R6042
P6082
ID+ ID-
Trimming
resistor
Test
point
C
Mark
R6041
P6081
ID+ ID-
Trimming
resistor
Test
point
R
Mark
R6040
P6080
ID+ ID-
Trimming
resistor
Test
point
L
Mark
[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, R6044 and R6045to counter clockwise.
2. Connect the DC voltmeter to test point P6080,P6081, P6082, P6083, P6084 and P6085.
Connect 100-ohm resistance near the terminal of the two poles of a Jig terminal.
6. Wait for 4 - 5 minutes. (Heat running)
7. Re-adjust the trimming resistors as following procedure.
Trimming resistor
(Adjustment point)
R6040
R6041
R6042
R6043
R6044
R6045
Adjustment value
2.5 mV
2.5 mV
2.5 mV
1.5 mV
1.5 mV
1.5 mV
Test point
(Measuring point)
P6080
P6081
P6082
P6083
P6084
P6085
Adjustment point
R6040, R6041, R6042
R6043, R6044, R6045
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
Left
Right
Center
Surround Left
Surround Right
Surround Back
Channel
Left, Right,
Center
Surround Left,
Surround Right,
Surround Back
ID+
ID-
Test point
DC voltmeter
Jig terminal
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.
U16
POWER AMPLIFIER
PC BOARD
(NAAF-8245)
Mark
L
R
C
SL
SR
SB
Specifications
( In a stable state)
10 +/- 3 mV
7 +/- 3 mV
Idling current are stabilized in about
10 minutes after a power supply ON.
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