Integra DTR-7.7 Service Manual page 13

A
SCHEMATIC DIAGRAM-3 (SD-3)
POWER AMP SECTION-2
1
2
3
4
<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.
5
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.
B
NAAF-9003
U20
!
ARE CRITICAL FOR SAFETY
IS DC VOLTAGE.(NO INPUT SIGNAL).
) ARE IN uF/WV.
DRIVER AMPLIFIER PC BOARD
Front L ch
R5000 C5010
+
1K 47/50
R5040
2.2K
Front R ch
C5011
R5001
+
1K 47/50
R5041
2.2K
Center ch
R5002 C5012
+
1K 47/50
R5042
2.2K
C
+55.3V
2SC1845-E
2SC1845-E
Q5000 Q5010 +1.1V
R5020 0V
0V
330
-51.2V Q5050
2SC1845-E
-51.8V
-1.0V
-55.5V
+55.3V
2SC1845-E
2SC1845-E
Q5001 Q5011
+1.1V
0V
R5021 0V
330
-51.2V Q5051
2SC1845-E
-51.8V
-1.0V
-55.5V
+55.3V
2SC1845-E
2SC1845-E
+1.1V
Q5002
Q5012
R5022 0V
0V
330
Q5052
-51.2V
2SC1845-E
-51.8V
-1.0V
-55.5V
DTR-7.7
D
+56.5V
Q5030
2SA949Y
120K
R5030
NFL 1
-B1L 2
R5230
120K +B1L 3
4
B+L
5
B-L
Q5040
2SC2229-Y
-56.5V
+56.5V
Q5031
2SA949Y
120K
R5031
1
NFR
-B1R 2
R5231
120K
+B1R 3
B+R 4
B-R 5
Q5041
2SC2229-Y
-56.5V
+56.5V
Q5032
2SA949Y
120K
R5032
NFC 1
-B1C 2
R5232
120K
+B1C 3
B+C 4
5
B-C
Q5042
2SC2229-Y
-56.5V