Onkyo TX-8255 Schematic
TX-8255
http://receiverfaq.ru/
A
BLOCK DIAGRAM
1
AUDIO IN / OUT
2
PHONO
OUT
TAPE 1
LINE 1
/DVD IN
LINE 2 IN
OUT
TAPE 2
CD
IN
IN
PHONO EQULIZER
Q301
TUNL
BCDEFGH
SELECTOR
Q302
TC9273CNG
PHONO
CD
REC1
PLAY1
V1
V2REC
V2PLAY
TUNER
REC2
PLAY2
VOLUME
R641
MOTOR DRIVE
Q481
TA7291S
UP
DOWN
+5.6V
+12V
TO SELECTOR & PHONO EQ.
STB
DATA
CL
-12V
BALANCE
R393
Q401
NJM2068
TREBLE
R415
BASS
R409
Q402
NJM2068
MUT
MUTING
Q491
RDSCLK
RDSDAT
TMUT
FM/AM(RDS) TUNER UNIT
3
4
RI
IR IN
IR OUT
STANDBY
5
TU-L
SD
STEREO
PLLSDO
PLLCLK
IRIN
IROUT
LEDSTBY
Q706
+5.6V
MAIN MICROPROCESSOR
RI
REMIN
REMOTE SENSOR
U851
FLDRST
FLDCS
FLDCLK
FLDSDO
K0
K1
K2
K3
KEYINT0
KETINT1
KEYINT2
KEYINT3
Q601
M30622MWP
DISPLAY CONTROL
FL DISPLAY
Q852
FL DRIVER
Q851
M66005
+5V_CPU
POW
BACKUP
C704
FLAC1
FLAC2
CONTROL KEYS
+5V_CPU
+5V_MPU
-VP
Q701
C709
TX-8255
VOLTAGE REGURATOR
Q921
+12V
-12V
Q922
D920
+B3
-B3
D920
D915 - 918
PROTECT
Q525, 526
Q581, 582
PRO
POWER AMP.
TO POWER AMP
E
+B1
C916
C915
D911
SP. A RELAY
RL591
SPEAKERS
SP. B RELAY
RL592
RELAY
RELAY
DRIVE
DRIVE
Q591
Q592
SPB
SPA
THERM
-B1
P501
A
SPEAKERS
B
THERMAL
SENSOR
Q855
MAIN TRANS.
T901
P503
PHONES
F901 ---> MDC type only
F902 ---> MPP type only
F902
F901
S901
NC
240V
PRI. RELAY
RL901
PRIMARY
AC IN
P901
Q701
FLAC1
FLAC2
THERMAL FUSE
120V
SUB TRANS.
T902
Q912
F903
OUTLET
P910
TX-8255
A
BLOCK DIAGRAM
1
AUDIO IN / OUT
2
PHONO
OUT
TAPE 1
LINE 1
/DVD IN
LINE 2 IN
OUT
TAPE 2
CD
IN
IN
PHONO EQULIZER
Q301
TUNL
BCDEFGH
SELECTOR
Q302
TC9273CNG
PHONO
CD
REC1
PLAY1
V1
V2REC
V2PLAY
TUNER
REC2
PLAY2
VOLUME
R641
MOTOR DRIVE
Q481
TA7291S
UP
DOWN
+5.6V
+12V
TO SELECTOR & PHONO EQ.
STB
DATA
CL
-12V
BALANCE
R393
Q401
NJM2068
TREBLE
R415
BASS
R409
Q402
NJM2068
MUT
MUTING
Q491
VOLTAGE REGURATOR
Q921
+12V
-12V
Q922
D920
+B3
-B3
D920
D915 - 918
PROTECT
Q525, 526
Q581, 582
PRO
POWER AMP.
TO POWER AMP
E
+B1
C916
C915
D911
SP. A RELAY
RL591
SPEAKERS
SP. B RELAY
RL592
RELAY
RELAY
DRIVE
DRIVE
Q591
Q592
SPB
SPA
THERM
-B1
P501
A
SPEAKERS
B
THERMAL
SENSOR
Q855
P503
PHONES
F901 ---> MDC type only
RDSCLK
RDSDAT
TMUT
FM/AM(RDS) TUNER UNIT
3
4
RI
IR IN
IR OUT
STANDBY
5
TU-L
SD
STEREO
PLLSDO
PLLCLK
IRIN
IROUT
LEDSTBY
Q706
+5.6V
FLAC1
FLAC2
MAIN MICROPROCESSOR
RI
REMIN
REMOTE SENSOR
U851
FLDRST
FLDCS
FLDCLK
FLDSDO
K0
K1
K2
K3
KEYINT0
KETINT1
KEYINT2
KEYINT3
Q601
M30622MWP
DISPLAY CONTROL
FL DISPLAY
Q852
FL DRIVER
Q851
M66005
+5V_CPU
POW
BACKUP
C704
FLAC1
FLAC2
CONTROL KEYS
+5V_CPU
+5V_MPU
-VP
Q701
C709
MAIN TRANS.
T901
THERMAL FUSE
F902 ---> MPP type only
F902
F901
S901
NC
240V
120V
PRI. RELAY
RL901
SUB TRANS.
T902
Q912
F903
PRIMARY
OUTLET
P910
AC IN
P901
TX-8255
A
SCHEMATIC DIAGRAMS-1
AMPLIFIER SECTION
1
NC
P917B
P301
L
PHONO
R
R315
2
CD
L
R
L
OUT
R
TAPE 1
P302
L
IN
R
L
OUT
VIDEO
IN
NC
R
L
IN
R
P303
L
R
L
R
L
R
TAPE 2
3
LINE 1/DVD IN
LINE-2 IN
R316
R319
2.2K
R320
2.2K
R323
R324
R327
2.2K
R328
2.2K
R331
R332
R335
R336
R339
330
R340
330
R343
R344
C317
330
LIST
C318
LIST
330
C319
NC
C320
NC
C321
330
LIST
C322
LIST
330
C323
NC
C324
NC
C325
330
LIST
C326
LIST
330
C327
330
LIST
C328
LIST
330
C329
LIST
C330
LIST
C331
330
C332
330
R317
R318
R321
R322
C341
223Z
R325
R326
R329
R330
R333
R334
C342
223Z
R337
R338
R341
R342
R345
1M
R346
1M
BCDEFGH
NAAF-8886
C307
C308
R307
820
R308
820
NJM4565D-X
Q301:B
5
C305
152J
6
C309
682J
R309
470K
PHONO
EQUALIZER
R310
470K
C310
682J
8
2
C306
152J
3
4
TC9273CNG-010
1
PHONO
2
CD
3
T1 REC
4
T1 PLAY
5
DVD
6
V REC
7
V PLAY
8
TUNER
9
10
T2 REC
11
T2 PLAY
SEL
12
13
GND
14 15
CLK
C303
47/25
C301
471K
C302
471K
1K
J594
NC
J596
R305
220K
100/10
R303
56K
R304
56K
100/10
R306
220K
C304
47/25
NC
R301
1K
R302
1M
1M
1M
1M
1M
1M
1M
1M
1M
1M
J595
NC
1M
1M
1M
1M
C343
223Z
U08
AMPLIFIER PC BOARD
C313
7
10/50
C311
182J
R311
39K
R313
C345
100K
223Z
R314
100K
R312
39K
C312
182J
Q301:A
1
NJM4565D-X
SELECTOR
Q302
VSS VDD
R349
22K
C314
10/50
DATACL
28
27
26
25
24
23
22
21
20
19
18
17
16
STB
DATA
+12V
-12V
-12V
+12V
STB
R350
22K
C315
220/16
C316
220/16
C354
22/50
C353
22/50
R354
R353
C461
47/25
C462
47/25
C401
47/25
R404
220K
C402
47/25
JL613A
101K#
10
Q403 : NJM2068L-D
R451
3.3K
3
C457
2
101K#
R459
3.3K
R460
3.3K
6
C458
57
R452
3.3K
R401
1K
3
C409
2
LIST
R403
220K
C405
101K
3.3K
R419
C417
47/25
D401-D404 :
1SS133 or 1SS270
Q401-Q402 : NJM2068L-D
C418
47/25
3.3K
R420
6
C410
LIST
5
R402
1K
JL613B
MTRMTR+
MTRG
L3
E
L2
E
R2
E
R3
4
Q403:A
8
Q403:B
C429
4
Q401:A
8
47/25
C403
C404
47/25
C406
101K
C648
223Z
1
C453
101K
R455
22K
R456
22K
C454
101K
NC
1
R405
R406
7
Q401:B
C455
47/25
R457
3.3K
R461
100K
R462
100K
R458
3.3K
C456
47/25
C428
NC
C407
47/25
R407
3.3K
R415
100K
1
2
R417
C421
223J
C422
223J
R418
1K
1K
R408
3.3K
C408
47/25
3
7
6
5
TREBLE
22K
22K
U10
VOLUME PC BOARD
R641
47152
R643
8.2K
8
4
9
3
R409
100K
1
2
3
BASS
8
4
9
7
6
5
R644
8.2K
C411
47/25
C412
47/25
NAAF-8888
6
NC
C451
47/25
R453
220K
R454
220K
C452
47/25
-12V
+12V
R351
10
R352
10
10
10
NC
C426NCC425
R391
R442 10
R441
1K
C391
101K
R393
250K
3
8
4
9
2
1
BALANCE
C392
101K
1K
R392
R904
R905
NC
4
5
Refer to following table about the parts displayed by mark "LIST".
C317, 318
C321,322,
C325-330
C409, 410
MDC MPPTYPE --->
None 101K
NOTE
THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY
REPLACE ONLY WITH PART NUMBER SPECIFIED.
VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE.(NO INPUT SIGNAL).
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 ( ) ARE IN uF/WV.
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.
1
2
34
P705B
1
2
34
P704B
JL261B
V_GND
+12VA
1
2
NC
MON-B
MON-A
3
4
5.6V
19
P701B
+10S
RLGND
CLK
MPUGND
DATA
MON-A
+12VS
MON-B
15
To NADG-8876
STB
VOL_DN
VOL_UP
AMUT
+12VR
5
10
MICROPROCESSOR PCB
-12VA
23456
1
P702B
+12VA
PROTECT
SP_A
+12V
-12V
SP_B
SE1H
7
DIRECT
POFF2
8910
TU_L
TS_GND
11
TU_GND
TU_R
13
12
SD-2 : G3
2
Q921
78M12
3
O
G
C922
33/50
C923
1
10/50
3
G
O
Q922
79M12
Q921A
HEATSINK
4
R932
330K
223Z
C931
Q924
2SA965-Y
R934
100(1/2W)
-VP
FLAC2
FLAC1
123
JL716B
DISPLAY PCB
TO_NADIS-8887
SD-3 : C2
NC
R901NCR900
C920
223Z
C921
223Z
31
D922
MTZJ33D
R931
3.3K
(1/4W)
R933
22(1/2W)
J902
NC
R903
NC
J901
C928
100/50
RL1N4003
GP104003E
J900
D921
2
C930
223Z
1
I
2
I
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