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
-