Sony TA-V925NE User manual

SERVICEMANUAL
This set is the Stereo
amplifiersection in
LBT-V925CD
AEP Model
UK Model
SPECIFICATIONS
Poweramplifler
Poweroutput 85W + 85Wat5 %distortion
Power
consumption 150W
ACoutlets
Dimensions
Weight
2 unswitched.
200
W max.
355x 132
X 335 mm
(w/h/d)
(14
X 5rl5X 13rlcinches)
Approx.6.7
kg
(14lb13oz)
General
Power
requirements240
VAC,50
Hz
Designand
specifications
subject
tochange
without
notice.
STEREO
POtllER
AMPLITIER
SONY.

Title Page
I. GENERAL
1-1.Functionof Controls......i.........'.......'.".."."'.."
3
4. DIAGRAMS
4-1.
Circuit Boards Location ....".."..".5
4-2.
Semiconductors
Lead Layout...........'......'.....'..'
6
4-3.Printed
'ffiring Boards ......'...'....'.7
44. Schematic
Diagram....... ......'....... 1l
MODELIDENTIFICATION
- Specification Labet -
AEP,ltalian Model
: AC:22OY-50,/60H2 150W
UK Model:
AC: 240V-50,/60H2 150W
TABLEOF CONTENTS
Description
o
M0DELN0.
TA-V925NE
STEREO
AMPLIFIER
SAFETY.RELATEDCOMPONENTWARNINGII
coMPoNENTS
|DÊNTTFTEDBY MARK 2[ On OOrreO
L|NE W|THMARK l\ ONTHESCHEMATTC
DTAGRAMS
AND IN THE PARTS LIST ARE CR]TICALTO SAFE
OPERATION. REPLACETHESECOMPONENTS WITH
SONY PARTS WHOSE PART NUMBERSAPPEAR AS
SHOWN
IN THISMANUAL OR IN SUPPLEMENTS PUB.
LISHEDBY SONY.
-2-

sEcTtoN
I
GENERAL
Parts ldentification
Power amplifier
iUl powER
swtrch
El peax
powEn
METER
EJ ueren RANGE
setecror
[S'lopenlnoN Indtcaror
lEl speerenssetector
lEl XeaopXONESlack
(srereo
phone
jack)

Note : Follow the disassemblY
order given.
TFRONT
PANEL]
(DC Bias Adjustment)
Perform this adjustment when
or ICs of the Power amPlifier.
Setup
:
. No signal (No load)
. Minimum volume
Procedure
:
1. Connect DC volt meter to
2. Turn on the Power and wait
RT101 (L-CH) and RTlSl
voltage becomes
7mV.
Adjusument Location :
VTVM
(DC
range)
(MA1N
boardl
m
sEcTloN
2
DISASSEMBLY
proceduroin the numerical
o BVTP3XS
eKNoB--*âà
e)KNoB
sEcrloN 3
ELECTRICAL
ADJUSTMENTS
replacing
the transistors
the TP.
for 3 minutes,then adjust
(R-CH) so that the bias
/ u*,
@À
Kt l,
F1 \ÈLJ I
\ZJ RT1o1
rpi
I

SECTION
4
DIAGRAMS
.Ll. CIRCUIT
BOARDS
LOCATION
SPEAKER
TEAMINAL(B) BOARD
PT
PT TRANSLATION
BOARO
HEADPHONE
JACK
SPSW BOARD
METER
BOARD
POWER
BOARD
SPEAKER
TERMINAL(A) BOARO
SURROUND
JACKEOARO
PINJACKBOARO
TRANSISTOR
R BOARO
TRANSISTOR
L BOARD
MAINBOARD
RELAY
BOARD
METER
SW BOARD METER
SWTRANSLATION
BOARD

LEAD LAYOUT
2SC1
841-PA
/h
lN
/t\
+2. SEMICONDUCTORS
I
1
SS1
585
1OEzN
_,::,-:"
N
':#"",
u
PC1
237H4
V*-
e
V
l-*
30DL4-FC
ï*
l-
m
u
PC1
298V
,'m,a
2SA1
348
25C3402
DTAl
14ES
n:r
ffi[
altl
SLR-34UW5
fr
1SS1
20
lz-ta
g
I
I
F--
SEL241OE-C
n
'""''ft'"^
a6& cthode
25A1232
2SC301
2
t\
,'ry'.
2S01585-K
N
,[{.

. SEMICONDUCTOR
LOCATION +3. PRINTED
WIRINGBOARDS . Refer to page 6 Semiconductor
Lead Layouts.
(TRANSISTOR
L BOARDI (TRANSTS
Ref. No. Location
rc101
tc151
rc201
rc301
tc401
rc451
01
01
0102
0103
Ql04
o1
51
0152
o1
53
0154
o201
o401
0402
D1
01
D15l
D152
D201
D202
D204
D210
D301
0302
D303
D304
D305
D306
D402
D404
D405
D406
D407
D408
D409
D41
0
D411
D412
D413
D414
D41
5
D452
D454
D455
D456
D457
D458
D459
D460
D461
D462
ts-J
E-7
F-9
E-2
H-
17
H-20
B-3
B-4
é-z
D-2
B-8
B-6
B-9
r-é
H-18
G-
19
o-2
E-9
F-9
F-9
H-9
t-é
r-8
E-12
F
*12
I-b
t-7
r-6
t-7
G_
1B
H-18
H-18
H-18
H-
18
H-18
r-18
t- 18
r-
1B
t- 18
G-
18
G-
18
H-19
G-
19
H-19
H-19
H-
19
H-19
H-19
r-19
r-19
t-
19
t-
19
Note
:
. O-: parts exlracted
from the componenl
side'
Jueren
sw
I TRANSLATION
I BOARD
-7-

15 16 17 18 19 20 22
21
SPEAKER
TERMINAL
(B)
BOARD
-
q
x
__ -,_.d
q
IMETER
BOARDI
9

13 24 25 26 27 28 29 30
SPEAKERTERi,|INAL
(A) BOARD
lsuRRour{D
JAct(
BoARD
JACKBOARD
IPOWER
BOARDI
lIÂ
oFF 0ll
lïorrERl
- t0
-

.14. SCHEMATIC
DIAGRAM
1
BOARDI
PINJACK
BOARD i.*l
MAIN [-[rnfr
I oror
. 2SDl585
BIAS
I
RI
t.
m*#S'*
cl0l
50v
D102,404-406
sEL22
I
oW_D
D404 :10
|
1298Y
40.7
lt ^!t
R,
5
m
POWER
E
POWER
RI
I
D452,454-15,6
SEL22
IOW_D
^!t
ctSl
Rt52
RTrsl
-4s
tr-ffia -
R4tI
550
r0.
I
8102
2SC3402K
LED
DRIVE
)
crlo;
i!9.s
t0v
cr53
Rr55
I
O.-7 9.-4 S.'t
^ 5.J LED
DRIVE
L-CH
d :.4 10.7
.8.
t. s.4 to.7
'+qr.
I lclo2
,4,t..rJ_ +I1.7 D107-412
r6v1 150v sEL22tow_D
l2.l ^ ^ LED
DRtvE
R_CH
D r'r^ 0- ^8
,r.t,rrr, to.7 9.-t t,'t
tR2E/.1
9,t 10.7 g,I E.1 lo.7
C45f+ +1C152 D4s7
-
t62
sEL22
|ow-D
040|
2SAr
318K
LED
DRtvE D4l4
sEL22tow-D
|
oPERAT
|
0Nl
'Lol
* ,tpt
sov | 6,.tu
-il-

TOR
LBOARDI
0l
02
2SC301
2
POWER
ÀUP
11-aeuayeoARoj-
-l I,* BoARDil
lll aig
A
R109
l0
r-l"
T+
Rll3
1x
Rr21
47
( /2lll
A *,t,
-1 crse
AMP I
t6
cl57;
c,:oI
Rl65
3 Rl67
arH,i6b.q}æiFia,
li
RRBoARpl_
_ __ _lj
I2V REG
czpr.l * litl. lrr7
sôv I I 6'3v MAIN
BOARD(I/2)I a
-12-

TH-ElopHonef
I IJACK
BoARDI ItruRnouNî 'l
t-|-l-
lJ I
I
I lsCRouNDl
f- SPEAKER I
t-
l_tF
I
,ncreolnol
Xen
fenfrlrflAft
BOARD IlspeaxenTERMTNAL
I(A) BOARD
T301
POWER
IRANSFORMER
lpowEn
eonnol
' I l.
)- -J llE&ry'l
[Ér
rnnuslarnru
aonRol
[meren
sttt
BoARD
'F302
i'
13.!ê!l
- t3
-

. IC BLOCKDIAGRAM
NotE
:
. All capacitorsarE in u F unless otherwiso noted. pF : u u F
50WV or less arE not indicatedexc€pt for elsctrolytics
and lanlalums,
. Afl rEsistorsare in o and ltW or less unless otherwiso
specified.
. Gomponents
for right channel havg same values as for left
channel.
ReferEncEnumbers are codEd from
. Æl- : nonflammable
râsistor.
. @l : fusible resistor.
' fFl :B+ Lins
. fB-:l :B_ Line
. Voltagg and waveforms are dc with respect to ground
under no-signal
conditions.
.. Voltages are taken with a VOM (input impedancg
10M o)'
VoltagEvariationsmay be notod duE to normal produc-
tion tolerancEs,
. Signalpath.
c) : LINE

NOTE:
o The mechanical parts with no reference
number in the exploded views are not
supplied.
The construction parts of an assembled
part are indicated with a collation num'
ber in the remark column.
Items marked "*" aîenot slocked since
they are seldom required for routine
service. Some delay should be antici'
pated when ordering theseitems.
sEcTloN
5
EXPLODED
VIEW
UK MODEL-.1
Due to standardization, paris with part
number suffix -XX and -X may be dif-
ferent from the parts specified in the
componenls usedon the set.
Color Indication of Appearance Parts
Example:
(REO)
... KNOB,BALANCE {WHITE}
AA
t,
Cabinet'sColor Parts Color
UK MODEL
The components identified by
mprk l\ or dotted linewilh mark
^\ are-criticâlfor safety.
HCptace only with pan number
specified.
(1) cNJ3oz
I
wlltr
(
I
I
tl
I
I
|
('
ll
1l
t\ Q*-æ 909
re;\/
lEg-tN\
iffiiIF
i-qio-into
902
,rnot suoolted) )
âi
5
,.-/'u
AEP.ltalian
MODEL
suppliedwitÀ
cNJl02 ^'r'frffi
suppliedwith
s401
12
ttY
6
I
I

No. Part No.
*4-928-442-01
*3-309-l
44-21
4-931
-l 69-01
*4-924-52V21
7-685-648-79
7-685-646-7
9
7
-682-547-04
7-682-548-04
7-682-560-04
Descri
pti
on
KNOB
(DIA.2I
)(METER
RANGE)
KNOB
(SPEAKTRS)
PLATE,
SHIELD
RETNFoRCEMENT
(CHASSIS)
SCREI,J,
TAPPING
PANTLASSY,IRONT
PLATE
(LEG)
ASSY,ORNAMENTAL
FELT
BUTTON
(P)
JOINT
HOLDER
(S), LED
HOLDER
(L), LED
HOLDER,
PC
BOARD
scREt,l
(cAsE)(M3x8)
CAST
SHEET,
INSULATING
EUSHING
(2.l04),
C0RD
(AEP).......PANE1,
BACK
(uK)........PANE1,
EACK
(lta1
ian)...PANEL,BACK
HEATSrNK
(S)
HEAT
SINK
FOOT
CHASS
I
S
SCREW
+BVTP
3X12
TYPEzIT-3
SCREW
+BVTP
3X8 TYPTz
N-S
SCREW
+BVTT
3X6 (5)
sCREli
+BvTT
3X8 (s)
SCREW
+BVTT
4x6 (S)
Remarks No. Part No. Descri
pt
ion
c0vtR
(DiA.
20), CAPACTToR
CUSHION
(uK)....LABtL,
CAuTt0N
(BACK)
Rena
rks
PC
BOARD,H.PJACK
PCBOARD,POWER
PC
BOARD,
I'IETER
MOUNTED
PCB,
MAIN
PC
BOARO,SPEAKERTERMIAL
POS
ISTOR
PC
BOARD,SURROUNDJACK
PCBOARD,PINJACK
(AEP,
Italian)...C0RD,P0WER
(uK)... .CORD,
Por.lER
HOLDER,FUSE
(AEP,
Italian.)...TERMINAL
JACK
(HEAoPHoNES)
(uK)... ..0UTLET,
AC
(AEP,
Italian)...0UTLET,AC
FUSE,
TI}.,IE-LAG
(T2.5A)
(AEP,ltalian)...FUSE,
TIME-LAG
(T2.5A)
IC UPCI
298V
ICUPCl298V
ICM5F78l
2
S}/ITCH,ROTARYSLIDE
(SPEAKERS)
st,llrTcH,
R0TARY
(METER
RANGE)
(uK)... .TRANSFORMER,
PoWER
(AËP,
Italian)...ïRANSFORMER,P0|rlER
I 4-916-745-01
2 4-908-097-21
3 *4-930-81 9-01
4 *4-928-458-01
5 7-621
-849-00
6 X-4917-273-1
7 X-4917-252-1
I 4-928-401-01
9 4-921
-91
9-01
I
0 *4-928-448-01
I1 *4-928-444-01
l2 *4-928-450-01
I3 *4-924-098-21
'l
4 3-704-366-01
|
5 4-91 9-379-1
1
I
6 4-91l-232-01
t7 *3-703-244-00
I
I *4-930-81
5-l I
*4-930-81
5-2
1
*4-930-8,l
5-31
28
29
30
901
902
903
904
905
906
907
908
909
*4-87
5-455-3
1
9-91
I
-81
5-01
5-tuJ-uI9-ll
*l-628-791-l
I
*l
-631
-l 24-l
I
*l-628-788-l
I
*A-4388-805-A
*1-628-794-l
I
I
-800-427*00
*1
-6?8-7
9?-1'l
*1
-628-793-l
I
la.
|
-f))-/ )u-uu
A.I
-556-o3s-oo
l9
20
?1
zz
23
24
25
26
27
9l0 *l-533-21
3-31
9lI l-535-476-lI
cNJl
02 1-50i-796-7',l
cNJ30aÂ]-526-751-l
i
cNJ30ai-526-794-1
I
F30l
&l-532-286-00
F302
A,l-532-286-00
ICI0l 8-759-l09-06
ICl
sl 8-759-l09-06
IC30l 8-759-604-33
st0t t-570-366-tI
s40l 1-571-801-lI
T30l
À.1-449-731-l
I
T30l
A.l-449-732-lI

NOTE:
o Due to standardization,replacementsin the parts
llst may be different from the parts specifiÊd in
the diagramsor the components usedon the s€t.
. fÎêms marked "t" are not slocked since they
are seldom required for routine service. Some
delay should be anticipeted when ordering these
items.
. lf there are two or more same circuits in a sel
such as a stereophonic machine, only lypical
circuit parts may be indicated and capacitorsand
resistors in other same circuits may be omitted.
Ref.No. Part No. Description
*l-628-791-ll PC
BOARD,H.PJACK
*l-631-l 24-l
I PCB0AR0,PoWER
*l-628-788-ll PC
BoARD,METER
*A-4388-805-A
MOUNTED
PCB,
MAIN
*I-628-794-'II PC
BOARD,SPIAKERTERMIAL
l-800-427-00 P0srsT0R
*1-628-792-1'I
PC
BOARD,SURROUND
JACK
*1-628-793-II PCBOARD,PINJACK
Àl-5ss-750-00
(AEP,tralian)...c0RD,
por{ER
Âl-556-035-00
(UK) .....CORD,
P0IER
910 *l-533-213-31
H0LDER,FUSE
9lI l-535-476-l1
(AEP,Italian)...TERMINAL
BP30l
*l-535-141-00
BASE
poST
22MM
(loMM
prTCH)
4p
cl
0l l-124-927-11 ELECT 4.7MF
cl03 l-l26-335-l l ELECT 220Mt
cl04 l-102-951-00 CERAMIc l5PF
sEcrloN
6
ELECTRICALPARTS LIST
CAPACITORS:
MF:
pF,
PF:
p1tF.
RESISTORS
. All resistorsareinohms.
o F: nonflammable
cotLs
. MMH: mH, UH: pH
SEMICONDUCTORS
ln each case,
U: p, for example:
UA...:
pA...,
UPA...:
,tPA...,
UPC...:
pPC,
UPD...:
pPD...
The cgmponents ldentif ied by
mark A or dotted linewith mark
1[ are-criticat for safety.
Replace only with part numbor
specified.
50v
50v
50v
63V
63V
50v
l0%
101
r0x
20r
20',
Êq
20?,
201
201
201
20r
201
20%
201
1ofl
90.|
902
903
904
905
906
907
908
909
c303
c304
c305
c306
c307
c308
Ref.No. Part No.
c3r
0 I
-l 6l
-744-00
c40l 1-l
24-589-l
I
c402 l-l 26-163-l
I
c403 l-l 24-589-l
I
c404 l-l 24-925-l
I
c45l l-l 24-589-1
I
c452 l-r 26-163-l
I
c453 l-l 24-589-l
I
c454 l-l 24-92s-l
I
cN00l
*l-562-370-00
cN002
*l-564-346-00
cNJl
0l l-565-31 9-31
cNJl
02l-s07-796-71
cNJl
03 l-565-319-31
cNJ30zal-526-794-l
I
cNJ
3o2al
-526-7
5l
-l I
cNP20l
A*l-564-505-l
I
cNP20l
B*l
-564-507-l
I
cNP2l0*l
-564-505-l
I
cNP70l
*l-564-505-l
I
cNP702*l
-564-507-l
I
cNP703'l
-564-507-l
I
cNP803*l
-564-339-00
Dl0l 8-719-815-85
Dlsl 8-719-815-85
Dl
52 8-7'l9-815-85
D20l 8-719-912-20
0202 8-71
9-912-20
0204 8-719-200-77
Dzl0 8-719-200-77
D30l 8-719-200-77
0302 8-719-ZOO-77
D303 8-719-230-34
0304 8-719-230-34
0305 8-7
I
9-230-34
0306 8-719-230-34
0402 8-719-900-19
0404 8-71
9-900-19
0405 8-719-900-1
9
0406 8-719-900-19
D407 8-719-900-19
0408 8-719-900-1
9
0409 8-719-900-l
9
D4l
0 8-71 9-900-19
Descri
pti
on
CERAMIC
ELECT
ELECÏ
ELECT
ELECT
ELECT
ELECT
ELECT
ELECÏ
400v
20I I6V
?ot 50v
20I l6V
201 50v
?o% I 6v
0.01MF
47MF
4.7t4F
47Nt
2.2t'4F
4714F
a4.7MF 20X 50V
4tqt 201" I6v
z.zMF 20r 50V
20I 50V
?0% I
0v
5T sOV
CONNECTOR,
BOARDTOBOARD
IBP
CONNTCTOR,BOARD10BOARD
I8P
JACK,
PIN
2P
(LINE
IN)
JACK
(HTADPHoNES)
JACK,
PIN2P
(SURR0UND
SPEAKER)
(AEP,
Italian)...0UTLET,AC
(uK)... ..0UTLET,
AC
PLUG,
CONNECTOR
2P
PLUG,
CONNECTOR
4P
PLUG,
CONNECTOR
2P
PLUG,CONNECTOR2P
PLUG,
CONNTCÏOR
4P
PLUG,
CONNECTOR
4P
PIN,
CONNECTOR
5P
DIoDE
I
SSI
585
DIODE
I
SSI585
DIODE
I
SSl
585
DIODT
I
SSI
20
DIODE
I
SSI2O
DIODE"
1OE2N
DIODE
I
OE2N
DIODE
I
OE2N
DIODE
I
OE2N
DIODE3ODL4+C
DIODE
3ODL4-FC
DIODE3ODL4-FC
DIODE30014-FC
DIODE
SLR-34UW5
DIODE
SLR-34ut.l5
DIODESLR-34UW5
DIODESLR-34U!|5
DIODE
SLR-34UW5
DIODESLR-34UW5
DIODE
SLR-34U}I5
OIODESLR-34UW5
c
l
05 l
-l 36-163-00
cl06 l-136-159-00
cl07 l-l 36-163-00
cl08 1-12C-572-ll
cl09 1-124-57z-tl
cil 0 l-102-973-00
cl
5l l-l 24-927-l
I
cl
53 l-l 26-335-l
I
cl
54 I-l 02-951-00
cl55 I-l36-l63-00
cl56 l-l 36-159-00
cl
57 I
-l 36-163-00
cl58 1-l24-57?-11
cl
59 l-l 24-572-1
I
cl
60 l-l 02-9i3-00
c20l l-124-927-11
c20? I
-l 26-176-lI
c203 l-l 24-499-l
I
c204 l-l 24-443-00
c30l I
-l 02-394-l
I
c302 l-l 02-394-l
I
I
-l 24-557-l
I
l-l 26-l0l-l 1
I
-l 25-556-lI
I-l 25-556-1 1
1-l30-789-00
I
-1
64-159-t
I
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Ref.No. Part No.
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D4t? 8-719-900-1
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4 8-71 9-900-19
D4l5 8-719-912-20
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0455 8-71
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D456 8-7
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0457 8-7
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Nota: The c€mponenq identlfied by mark I or dotted
line with mark /\ are critical for safety.
Replaceonly wii6 part number specified.
St4ITCH,
ROTARY
SLIOE
(SPEAKERS)
sl,lrTcH,
PUSH
(AC
POllER)(l
KEY)
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TERMINAL
BOARD
(SP)(SPEAKTRA/B)
TTRMINAL
TERMI
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TERMINAL
English
89H0247-1
Printed in Japan
o 1989.8
Pubfished by A/Y Engineering Service Dept,
SonyCorporation
Audio Group