Power Amplifier Section - Onkyo TX-SR876 Service Manual

A B
SCHEMATIC DIAGRAMS-3 (SD-3)

POWER AMPLIFIER SECTION-1

NACLA-9064
1
U19
+62.8V
POWER AMP
PC BOARD
+52.7V
C5011
R5001 R5021
+
1K 47/50 330
3
-0.6V
C5021
2
1 221K
1.8K -0.9V
R5091
-11.0V
-59.3V
FRONT R
2
NACLA-9069
U24
+62.8V
POWER AMP
PC BOARD
+52.7V
C5016
R5006 R5026
+
1K 47/50 330
3
-0.6V
2 C5026
1 221K
-0.9V
1.8K
R5096
-11.0V
-59.3V
SURROUND
3
BACK R
NACLA-9067
U22
+62.8V
POWER AMP
PC BOARD
+52.7V
R5004 C5014 R5024
+
1K 47/50 330
3
-0.6V
2 C5024
1 221K
-0.9V
R5094
1.8K
-11.0V
-59.3V
4
SURROUND
R
NACLA-9065
U20
+62.8V
POWER AMP
PC BOARD
+52.7V
R5002 C5012 R5022
+
1K 47/50 330
3
-0.6V
C5022
2
1 221K
R5092 -0.9V
1.8K
-11.0V
5 -59.3V
CENTER
C
+64.8V 15 (1/4W)
+B2R +B1R
R5231 +65V
+1.1V
+BR
R5181
+62.8V +63.4V
10
(1/4W) (1/4W)
33
R6311
1
0.0V
2
3
56K
4
R5251
NFR
6
+0.6V
R5261 5
R6111 270K -0.6V
4
3
10K C6001
102J
2
1
IDLING
ADJ.
-63.3V
-BR
-1.1V
-64.8V R5241 15 (1/4W) -B1R -65V
-B2R
15 (1/4W)
+64.8V
+B2SBR +B1SBR
R5236 +65V
+1.1V
+BSBR
33 (1/4W)
+62.8V +63.4V
R5186 10
(1/4W)
R6316
1
0.0V
2
3
56K
4
R5256
NFSBR
6
+0.6V
R5266 5
R6116 270K -0.6V
4
10K C6006 3
102J
2
1
IDLING
-1.1V
ADJ.
-63.3V
-BSBR
-1.1V
-64.8V
(1/4W) -65V
-B2SBR R5246 15 -B1SBR
+64.8V 15 (1/4W)
+B2SR +B1SR
R5234 +65V
+1.1V
+BSR
R5184
+62.8V +63.4V
(1/4W) 10
33
(1/4W)
R6314
1
0.0V
2
3
56K
4
R5254
NFSR
6
+0.6V
5
R5264
R6114 270K -0.6V
4
10K C6004 3
102J
2
1
IDLING
ADJ.
-63.3V
-BSR
-1.1V
-64.8V (1/4W) -65V
-B2SR R5244 15 -B1SR
+64.8V 15 (1/4W)
+B2C +B1C
R5232
+65V
+1.1V
+BC
R5182
+62.8V +63.4V
10
33 (1/4W)
(1/4W)
R6312
1
0.0V
2
3
56K
4
R5252
6
+0.6V
5
R5262
R6112 270K -0.6V
4
C6002 3
10K
102J
2
1
IDLING
ADJ.
-63.3V
-BC
-1.1V
-64.8V 15 (1/4W) -65V
-B2C -B1C
R5242
NACLA-9064,65,67,69
are fully compatible with each other.
D E
NACLA-9063
U18
POWER AMP
PC BOARD
R5000 C5010 R5020
+
1K 47/50 330
1
C5020
2
221K
3
1.8K
R5090
FRONT L
NACLA-9068
U23
POWER AMP
PC BOARD
C5015
R5005 R5025
+
1K 47/50 330
1
C5025
2
3 221K
1.8K
R5095
SURROUND
BACK L
NACLA-9066
U21
POWER AMP
PC BOARD
R5003 C5013 R5023
+
1K 47/50 330
1
C5023
2
3 221K
1.8K
R5093
SURROUND
L
<Note>
SD-x:XY is short for Shcematic Diagram-x and
each socket's location, X=A to H, Y=1 to 5.
NOTE
THE COMPONENTS IDENTIFIED BY MARK
REPLACE ONLY WITH PART NUMBER SPECIFIED.
VOLTAGE (MEASURED WITH VOLTMETER)
ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
ELECTROLYTIC CAPACITORS (
ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030- 3pF, 330- 33pF, 331- 330pF, 333- 0.033uF
ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.
THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.
EX) PRINTING SIDE
CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.
F G
(1/4W)
+64.8V +B2L 15 +B1L
R5230 +65V
+1.1V
+62.8V R5180 +BL
+62.8V +63.4V
10
33 (1/4W)
(1/4W)
R6310
+52.7V
0.0V
56K
-0.6V
R5250
+0.6V
R5260
-0.9V -0.6V
R6110 270K
10K C6000
102J
IDLING
ADJ.
-11.0V
-59.3V
-63.3V
-BL
-1.1V
(1/4W)
-64.8V -65V
-B2L R5240 15 -B1L
(1/4W)
+64.8V 15
+B2SBL +B1SBL
R5235 +65V
+1.1V
+62.8V +BSBL
33 (1/4W)
+62.8V +63.4V
R5185 10
(1/4W)
R6315
+52.7V
0.0V
56K
-0.6V
R5255
+0.6V
R5265
-0.9V -0.6V
R6115 270K
C6005
10K
102J
IDLING
ADJ.
-11.0V
-59.3V
-63.3V
-BSBL
-1.1V
-64.8V -65V
R5245 15 (1/4W)
-B2SBL
-B1SBL
15 (1/4W)
+64.8V
+B2SL +B1SL
R5233 +65V
+1.1V
+62.8V +BSL
R5183
+62.8V +63.4V
(1/4W)
(1/4W)
33
10
R6313
+52.7V
0.0V
56K
-0.6V
R5253
+0.6V
R5263
-0.9V
R6113 270K -0.6V
10K C6003
102J
IDLING
ADJ.
-11.0V
-59.3V
-63.3V
-BSL
-1.1V
-64.8V -65V
R5243 15 (1/4W)
-B2SL -B1SL
NACLA-9063,66,68
are fully compatible with each other.
!
ARE CRITICAL FOR SAFETY.
IS DC VOLTAGE.(NO INPUT SIGNAL).
) ARE IN uF/WV.
TX-SR876/SA876
H
4
3
2
1
1
2
3
4
5
6
4
3
2
1
1
2
3
4
5
6
4
3
2
1
1
2
3
4
5
6