Amplifier Section - Onkyo TX-8255 Service Manual

A
SCHEMATIC DIAGRAMS-1

AMPLIFIER SECTION

1
P301
L
PHONO
R
L
2
CD
R
L
OUT
R
TAPE 1
P302
L
IN
R
L
OUT
R
TAPE 2
L
IN
R
3
P303
L
LINE 1/DVD IN
R
L
LINE-2 IN
R
L
VIDEO
IN
R
NC
Refer to following table about the parts displayed by mark "LIST".
4
TYPE ---> MDC
C317, 318
C321,322,
None
C325-330
C409, 410
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.
5
<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.
B
NAAF-8886
C303
C305
47/25
152J
C309
682J
R305
R301
R309
220K
1K 470K
C307
100/10
C301
R303
471K
56K
R307
820
R308
820
C302 R304
471K 56K C308 R310
470K
100/10
C310
R306
220K
682J
C304 C306
47/25
R302 152J
1K
NC
P917B
R315
C317 R317
330
LIST
1M
R318
C318
R316
1M
LIST
330
R319 R321
C319 1M
2.2K
NC
C320
R320 R322
NC
1M
2.2K
C341
J594
223Z
NC
R323
C321 R325
330
LIST
1M
R326
C322
R324
1M
LIST
330
R327
C323
R329
2.2K
NC
1M
C324 R330
R328
NC 1M
2.2K
R331
C325 R333
330
LIST 1M
R334
C326
R332
LIST 1M
330
C342
223Z
J595
NC
R335
C327 R337
330
LIST 1M
R338
C328
R336
1M
LIST
330
R339
C329 R341
330
LIST
1M
C330 R342
R340
LIST 1M
330
R343
R345
C331 1M
330
C332
R344
R346
1M
330
C343
J596
223Z
NC
MPP
101K
!
ARE CRITICAL FOR SAFETY
IS DC VOLTAGE.(NO INPUT SIGNAL).
) ARE IN uF/WV.
1 2
3 4
P705B
U08
AMPLIFIER PC BOARD
NJM4565D-X
Q301:B
5
C313
7
6
10/50
C311
182J
R311
39K
PHONO
R313
EQUALIZER
100K C345
223Z
R314
100K
R312
39K
R351
C312
10
182J +12V
C315
220/16
2 Q301:A C314
10/50
1
C316
3 R352
220/16
NJM4565D-X 10
-12V
R354
10
-12V
C354
22/50
SELECTOR
C353
Q302 22/50
TC9273CNG-010
R353
10
1 28 +12V
VSS VDD
PHONO
2 27
CD
3 26
T1 REC
4 25
T1 PLAY
5 24
DVD
6 23
V REC
7 22
V PLAY
8 21
TUNER
9 20
10 19
T2 REC
11 18
T2 PLAY
12 SEL 17
13 16
GND STB
14 15
CL DATA
R349 R350
22K 22K
1 2
3 4
P704B
JL261B
P701B
NC
C
Q403 : NJM2068L-D
NC
C451
R451
47/25
3.3K
C457
101K#
R453
220K
R459
C461
3.3K
47/25
R460
C462
3.3K
47/25
R454
220K
C458
C452 101K#
R452
47/25
3.3K
-12V R442 10
+12V
R441 10
R401
R391 C401 1K
3
1K
C409
47/25
2
LIST
C391
101K
R403
220K
R393
250K
3
8
4
9
2
1
C417
47/25
D401-D404 :
1SS133 or 1SS270
Q401-Q402 : NJM2068L-D
C392 C418
101K 47/25
R404
220K
6
C410
C402
LIST
47/25
5
R402
1K
MTR-
MTR+
MTRG
L3
E
L2
E
R2
E
R3
+12V
-12V
P702B
MICROPROCESSOR PCB
To NADG-8876
SD-2 : G3
TX-8255
D
C455
3 Q403:A
47/25
R457
1
2 C453 3.3K
101K
R461
100K
R455
22K
R456
22K
R462
100K
6
C454
R458
101K
5 7
3.3K
C456
47/25
Q403:B
C429
C428
NC NC
C407
Q401:A
47/25
R407
1
C
3.3K
R415
4
R409
100K
100K
1 1
2 2
R405
C405
3
3
22K
101K
47/25
C403
R417
1K
8 8
C421
223J 4 4
9 9
C422
223J
R418
1K
C404
47/25
R406 7
7
6 6
22K
5
C406 5
101K
R408
C
3.3K
7 4
C408
Q401:B
47/25
N
U10
VOLUME P
C648
223Z
R641
3 6
4 2 7 5
1
R644
R643
8.2K
8.2K
R905 R904
NC NC
Q921
78M12
R901 R
NC
3 1
I
O
G
C922
2
C920
J902 J
33/50
223Z
NC
C921
C923
1 R903
223Z
10/50
NC
3 2
G
O I
Q922
79M12
J901
Q921A
HEATSINK
C930 D922
223Z MTZJ33D
R932
330K
R931
C928
100/50
3.3K
(1/4W)
R933 D921
Q924
22(1/2W)
2SA965-Y RL1N400
R934 GP10400
100(1/2W)
JL716B
DISPLAY PCB
TO_NADIS-8887
SD-3 : C2