Onkyo HTR-550 Service Manual page 11

A
SCHEMATIC DIAGRAMS-2
POWER AMPLIFIER SECTION
NOTE
THE COMPONENTS IDENTIFIED BY MARK
REPLACE ONLY WITH PART NUMBER SPECIFIED.
1
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.
<Note>
NC = No mount of parts.
SD-Z : XY
Location of connected terminal in schematic diagrams.
SD-Z = Schematic diagrams-Z. X = A to H, Y = 1 to 5.
2
Refer to following table about the parts displayed by mark "LIST".
Q6050 - 6052 Q6053- 6056 Q6060- 6062
2SC5242 2SC5242 2SA1962
To NAAF-8779(1/2)
(SD-1 : H1)
3
4
NAPS-8780
U02
TRANS. SEC. TERMINAL
PC BOARD
P6903B(YEW)
P6900B(BLK)
5
P6904B(GRN)
B
! ARE CRITICAL FOR SAFETY
IS DC VOLTAGE.(NO INPUT SIGNAL).
) ARE IN uF/WV.
FRONT Lch
FRONT Rch
Q6063 - 6066
2SA1962
VOLH
SEC1H
GNDS1
+22V
PROTECT
R6701
22K
Q6703
2SA1163-BL Q6702
2SC2712-GR
2SC2712-GR
P6903B
S1H+
P6904B
S1H-
4
1
3
2
F6901
2 !
3
10A 125V
1
4
F6902
!
10A 125V
NAAF-8779(2/2)
C
R5000
1K
L
R5001
1K
R
R5002
1K
R6902
1K
Q6707
GND
D6901
D10XB60H
4 1
!
3 2
RL6901
1
3 2 4
!
RL6902
4 1
D6903
D10XB60H
S1L+
2
1
4
3
S1L-
From Audio I/O
(PART 3)
HT-R550
C
U01 AMPLIFIER PC BOARD
R5180
10 (1/4W)
+50.5V
R5030
120K
C5010
R5020
0V
+
47/50 330 R5230
120K
-46.5V
Q5040
2SC2229-Y
R5190
10 (1/4W)
R5181
(1/4W)
10
+50.5V
R5031
120K
C5011
R5021
+ 0V
47/50 330 R5231
120K
-46.5V
Q5041
2SC2229-Y
R5191
10
(1/4W)
R5182
10 (1/4W)
+50.5V
R5032
120K
C5012 R5022
0V
+
47/50 330
R5232
120K
-46.5V
Q5042
2SC2229-Y
R5192
(1/4W)
10
To P6901B
P6901A
+65V
C6901
10000u/69V
P6911B
C6902
10000u/69V
-65V
P6902A
To P6902B
To NAVD-9178(2/2)
(SD-6 : E1)
D
+B1C
R6020
+1.1V
+BC Q6030
2SC5171
2.2
(1/4W) R6080
+1.0V 0.22
(1/4W)
+0.6V
-0.3V
NFC
P6080
ID+
ID-
IDLING
ADJUST
R6090
0.22
R6040
(1/4W)
2K
-0.6V
-0.4V
-BC
-1.1V
Q6040
2SA1930
-B1C
+B1L
R6021
+1.1V
+BL Q6031
2SC5171
2.2
R6081
(1/4W)
1.0V
0.22
(1/4W)
+0.6V
-0.3V
NFL
P6081
ID+
ID-
IDLING
ADJUST
R6091
0.22
R6041
(1/4W)
2K
-0.6V
-0.4V
-BL
-1.1V
Q6041
2SA1930
-B1L
+B1R
R6022
+ 1.1V +BR
Q6032
2SC5171
2.2
(1/4W) R6082
0.22
+1.0V
(1/4W)
+0.6V
-0.3V
NFR
P6082
ID+
ID-
IDLING
ADJUST
R6092
0.22
R6042
(1/4W)
2K
-0.6V
-0.4V
-BR
-1.1V
Q6042
2SA1930
-B1R
To NA
(S
JL6603A