Sony TA-N77ES User manual

SERUICE
MANUAL US
Canadian
.AEP
UK
E
Model
Model
Model
Model
Model
SPECIFICATIONS
POWER
OUTPUT
AND
TOTAL
HARMONIC
DISTORSION:
With
4ohm
loads,
both
channels
driven,
from
20
- 20,000
Hz;
rated
270
watts
per
channel
minimum
RMS
Power,
with
no
rote than
0.006%
total
harmonic
distortion
from
250
milliwatts
to rated
output'
With
I ohm
loads,
both
channels
driven,
from
20
- 20,000
Hz;
rated
200
watts
per
channel
minimum
RMS
Power,
with
no
more
than
0.004%
total
harmonic
distortion
from
250
milliwatts
torated
output'
0
dB
=
0.775V
STEREO
POTïER
AMPTITIER
Dynamic
power
10
Hz
- 100
kHz
8 ohms,
THD
0.02%
Total
harmonic
distortion
- Continued on Page 2 -
Item Condition Deta
Continuous
RMS
power
oulPut
(both
channels
driven
simultaneouslY)
4ohms
20Hz- 20kHz
THD
0.006%
270W
+ 270W
6ohms
20Hz-20 kH.z
THD
0.005%
230W
+ 230W
8 ohms
2O
Hz-20 kHz
THD
O.OO4%'
'2OO
W.+ 2OO
W
SONY.

TA.N77ES
Int€rmodulatlon
(lM)
dlstortion
60
Hz:7
kHz=
4:1
MODEL
IDENTIFICATION
- Specification
Label
-
e
General
System
Power requirements
US,
Canadian
model: l20 AC. 60 Hz
AEp, c-AEp, UK, E modet: 12O,22O,Or
24Ov AC
adjustabte,
50/6O Hz
Power consumption
US model: 3gO
W
Canadianmodel: 9S0 VA
UK model:490 W
AEp. G-AEP,
E modet:
510 W
Dimensions Approx. 4lO x 1gS
x 440
mm (w/h/d)
(lgllax 7t
h x 17% inches)
including projecting parts and controts
Weight Approx.25 kg (55
tb2 oz),
net
Super
legato
linear,
purecomptementary
SEpp
power
amplifier,
powertul
power
supply US
model:
AC:
Canadian
model:
AC:
AEP,
G-AEP,
Emodet:
AC:
UK
model:
AC:
120
V 60Hz 380
W
120
V 60Hz 9b0
VA
120/220/240
V-50/60 Hz StO
W
12O/22O/24O
V- sO/60
Hz 490
W
SAFETY.RE
LATED
COMPONENT
WARNINGI
!
COMPONENTS
IDENTIFIED
BY SHADING
AND MARK
7\ oru rxe scHEMATtc DIAGRAMs AND tN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE
THESE
COMPONENTS
WITH SONY PARTS
WHOSE
PARTNUMBERS
APPEAR
AS SHOWN
IN THIS
MANUAL OR IN SUPPLEMENTS
PUBLISHED
BY SONY.
ATTENTION
AUCOMPOSANT
AYANTRAPPORT
À LAsÊcuRITÉ!
LESCOMPOSANTS
IDENTIFIÉS
PAR UNE TRATVIE
ET
UNE MAROUE I sun LEs DTAGRAMMES
ScHÉ-
MATIOUES
ETLA LISTE
DESPIÈCESSONTCRITIOUES
POUR
LA SÉCURITÉ
DE FONCTIONNEMENT.
NË REM.
PLACER CES COMPOSANTS
OUE PAR OES PIÈCES
SONY OONT LES
NUMÉROS
SONT
DONNÉS
DANS
CE
MANUEL OU DANS LES
SUPPLÉMENTS
PUBLIÉS
PAR
SONY.
MODEL
NO.TA.N77ES
SERlAL
NO.
MADE ]N JAPAN
STEREO
POWER
AMPLIFIER
-2-

TA.N77ES
TABLE OF CONTENTS
Section Title
Specifications . .
Model Identification
Features
Safety Check-out .
SystemConnections
Function of Controls
1. DISASSEMBLY
CircuitBoardsLocation
2. ELECTRICAL
ADJUSTMENÏS.
3. DIAGRAMS
3-1. Semiconductor
LeadLayouts
3-2. Mounting
Diagram
3-3. Schematic
Diagram
4. EXPLODED
VIEWSAND
PARTS LIST .
Super
legalolinear
system
Thisunitemployssuper
legatolinear
system
which
drives
lowimpedancespeakersandassures
powerful
reproduction
withoutlowcrossover
distortionandswitchingdistortion
over
thewiderange.
Spontaneoustwindrive
power
supplyclrcuit
Condensers
having
large
capacity
areusedforthevoltage
amplification
drivestageofclassAandpower outputstage
ofclassB.
Thus,
astable
outputandhigh
quality
soundare
obtained,
resultinginexclusionof power
interferences.The
classAstage
realizesastableoperation
freefrom
interferenceofthepower stageeven
whenan
instantaneousorstrongoutputisreceived.
Gchassls
Aonepiece,
hard
chassis,
named
"Gibraltar",
reduces
distortion
caused
by
vibrations.
Thisreducesairvibrationsfromthefloor
andspeakers
and
also
reduces
vibrations
causedbythepower
translormer
andpower transistors.
Pege
I
2
5
4
5
9
ll
t2
l7
2l
5. ELECTRICAL
PARTSLIST. . 25
Troubleshooting Guide 30
SAFETY
CHECK.OUT
After correcting the original service problem,
perform the following safety check before releasing
the setto the customer:
Check the antenna terminals, metal trim, "metallized"
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakageas
describedbelow.
LEAKAGE TEST
The AC leakagefrom any exposed
metal part to
earth ground and from all exposedmetal parts
to any
exposed metal part having a return to chassis,
must
not exceed 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
I . A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers'
instructions to usetheseinstru-
ments.
2. A battery-operated
AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3. Measuring the voltage drop across a resistor by
meansof a VOM or battery-operatedAC volt-
meter. The "limit" indication is 0.75V. so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive
VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Exposed Metel
Partson Set
0.1
5 ttF
Fig.A. tJsing
anAC voltmeter to checkAC leakage.
-3-

TA,N77ES
The
unit
provides
twokinds ofinput
jacks,
FIXED
and
VARIABLE,whichcanbeswitchedby
means
otthe
INPUT
selector
located
onthefrontpanel.
FIXED
input
jacks:
Normallyconnectapreamplifier to
these
jacks.
When
these
jacks
areused,thesound
levelis
controlledby
theattenuator
on
the
connected
preamplifier.
VARIABLEinput
jacks:
ACD
player,
etc.,canbedirectly
connectedtothese
jacks
toenjoy thedigital
sound.
In
thiscase,theLEFTandRIGHTATTENUATORS
onthefront
panel
controlthesound
level.
RK.C3O5ES
to
Routput
Stereocontrolamolif
ier
Right
speaker
to Loutputs RK-CæsES
o(DoOO'()O(}.
/^
v
oQ
Leftsoeaker
-4-

TA-N77ES
o
E I-ett
andrightmeters
When
aspeaker
systemhaving
anominal
impedance
of
4ohmsisused,
the
needles
ofthemeters
oscillate
twice
aswhen
Sohmspeakers
areused.
El POWER
switch
E SPEAKERS
setector
Selects
speakersystemAor B,
orboth.
For
headphonemonitoring
onthe
connected
preamplifier,
settoOFF.
El METER
switch
Switches
meter
deflection
onoroff.
E PROTECTIONindicator
Lightsupfor
approx.I seconds
immediately
after
turning
onthe
unit.
This
indicates
that
the
built-inmuting
circuitis
activated.
In
normal
operatingconditions,
this
doesnotlight.
lfit
lights
up
(speaker
sound
isnotheard)
while
operating,
an
abnormalityhas
occurred.Inthiscase,
disconnect
the
ACpower
cordand
checktheconneçted
components
andspeakersystems.
E STEREO
indicator
Lights
upwhen
OPERATTON
is
settoSTEREO
and
a
stereo
program
isplayed.
El MONO
indicator
Lights
upwhen
OPERATION
is
settoMONO
anda
monaural
program
isplayed.
El INPUT
selector
Selects
input
source
connected
totheinput
jacks
onthe
rear
panel;
FIXED
orVARIABLE.
E ATTENUATORs
andindicator
Controlinput
signal
soundlevelfrom
thepreamplifier
connected
totheVARIABLE
input
jacks.
Theindicator
lights
upto indicate
thattheATTENUATORs
are
activated.
-5-

TA.N77ES sEcTloN
1
DISA$SEMBLY
lrlota: Followthe
disassembly
procedure
in thenumerical
order
given.
TOP
PLATE
AND ORNAMENTAL
SIDE
PLATE
(R} REMOVAL
flat head *rew
M3x8
ornatnental
screw ê x 25)
FRONT PANEL REMOVAL
\ùN
-6-

TA.N77ES
MAIN {A} BOARD OPEN
@Bax8
(4pcs.)
@ ioint
\!
1> Qavsxo
J
main (A) bærd
@
evrrs
(6 pcs.)
ELECT CAPACITOR
ASSY (C501,503)
REMOVAL
Q Remove the top ptate (&e page 6.).
@ bonmt ptatc
6----BWP3x to
\"zPTPs ' eo
BVTHIx 10
@ tapping*rew (M3 x 20)

TA.N77ES
PROTECTOR
BOARD
REMOVAL
(l Remove
ûe ap Plate(Sae Page
6.).
prot€ctor
bærd
@naqove the nvlon rivet'
When assembling, setthe board
into groove of the PC board retainer'
r I PC board rctainer
{II{
CË/
CIRCUIT BOARDSLOCATION
-----: -.- ---.;--l
i aeP, G-AEP,
uK, Emodel
I AC board
main lB) \
board
main (A)
bærd
tnnsisar (R)
bærd
LED (8)
bærd transistor
(L)
bærd
meter (B)
bærd SW(input)
board LED (A)
b@rd

SECTION
2
E
LECTR
I
CA
L ADJUSTM
ENTS
Note: Adjustmentshould
beperformed
5 minutes
latel. aftel
thepowerswitchison.
Offset Adjustment
Setting:
OPERATION
switch:
Input signal:
Procedure:
STEREO
No signal
inpur
VOM
Adjustment Location: main (A) board
. (0.25 dc renge)
speaker
dttput F-r
terminals lf-;f I
Hl -l-t
Adjust RT40l (L{H) and
0 V reading on the VOM. RT-451 (R{H) for nT40'
(L-CH) BT45I
(R-CH)
Bias
Gurrent
Adjustment
Setting:
OPERATION
switch:
Input signal:
Procedure:
STEREO
No signal
input
Adjust RT302(L-CH)and RT352(R-CH)sothat
VOM readingsof Tp-A (L-CH), Tp-B (R_CH)
become
l5 mV.
Adjustment
Location:main
(A) board
and
protector
board
voM _ R-CH
_
(0.25 Vdc renge)
RT352
(R-CHl
main (A) board
Crl rroo
_-o o:
-9-

MeterAdjustment
Setting:
OPERATIONswitch:
INPUTswitch:
METERswitch:
Procedure:
af osc
STEREO
FIXED
ON
FIXED SPEAKER
l. Set FIXED input level
for 8.9V readingon the
VOM.
2. Adjust
RT70l (L-CH)
and
RT751
(R-CH)
sothat
the
POWER/WATTS
8O meterindicates
l0 W.
Adjustment Location: protector board
TA.N77ES
3-1.
2SA955
a
'ï[[[,,
r
).bc2
2SA
2SA1383
2SC3514
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SECTION
3
DIAGRAMS
LEADLAYOUTS
2SC184t-PA
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cTu-22R sEL221oS-D
r^l
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'onr-Xllf 'hofr
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SEL2213C.D
sEL2513E
H(
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H26C2L
HZ11B2L
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rq
Ï|[fil
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2sK244
N
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25K246cR2
fltl
m'
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cTU32S
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{-r-l
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ltryTlÏrt
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-11-

TA.N77ES
3.2. MOUNTING DIAGRAM
- ConductorSide-
o See
page
8for Circuit
Boards
Location'
o See page
'l
1for Semiconductor
LeadLayouts'
. See
Page
20for notes'
Not6:
. Color
code
or sleeving
overthe endof the lacket.
a
a
G- : OârtS extracted from the component side.
O- : gârts extracted from the conductor side.
. SEMICONDUCTOR
LOCATION
Ref.
No. Location Ref.No. Location
D301
D302
D303
D304
D305
D306
D307
D308
D309
D310
D31
1
o312
D353
D354
D355
D356
D357
D358
D359
D360
D361
D362
D50l
D502
D503
D504
D505
D507
D601
D701
D702
D703
0704
D705
D706
0707
o754
D755
D756
D757
D801
D802
D803
D804
D805
D806
D807
D808
D901
D902
tc701
tc702
tc703
o301
o302
0303
0304
0305
o306
o307
o308
0309
o310
H-24
t-24
G-21
G-21
G-22
r-19
t-19
G-20
H-21
G-20
r-19
r-19
G-27
G-27
G-26
t-29
t-29
G-28
H-27
G-28
t-29
t-29
c-za
e-22
Ê.-24
E-28
E-21
E-21
D-31
D-9
D-9
H-10
c-3
c4
B-3
B4
c-l 1
c-10
B-1
1
B-10
H-3
K€
K-7
K-9
K-6
K€
J-14
K-t
0
B-17
c-17
B€
B-6
c-10
H-23
H-23
H-22
H-23
G-22
H-20
l-22
H-22
H-21
H-20
o31
1
o31
2
o31
3
o351
o352
o3s3
o354
03s5
o356
o357
o358
o359
o360
0361
o362
0363
o401
0.402
o403
o404
0405
o406
0.407
o408
o409
o410
o451
4452
o453
o454
o455
o456
0457
o458
0459
0460
o701
4702
0703
Q704
0705
0706
0707
0708
4752
0753
Q754
0755
o801
o802
0803
G-20
H-20
G-18
H-26
H-26
H-26
H-26
G-27
H-28
l-26
H-27
H-27
H-28
G-28
H-28
G-30
t-20
t-20
A-24
A-23
A-19
A-21
A-20
A-22
A-20
A-22
t-29
t-29
A-24
A-25
A-29
A-27
A-28
A-26
A-28
A-26
D-6
B-3
B-4
c-3
c4
D€
D€
c-9
B-11
B-9
c-l1
c-9
tl-12
H4
H-3
-12-

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0308
2SAt360
CLASS
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0309 Q3l0
2SAr383 2SK2460R2
CASCAOE CONSTANTCURRENT
R3r6
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(A$[HI,'",)
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Not€:
. All capacitors are in ,rF unless
otherwise noted' pF: pPF
50WV or lessare not indicated except for electrolytics
andtantalums.
. All resistors are in O and 7r
W or lessunless otherwise
specified'
. ÆX- : nonflammabte resistor.
. @l : fusible resistor.
o ' signal
Path.
. -: B+
bus.
a r-- : B- bus.
r f__-.l : adiustment for rePair'
. Voltage variations
may be noted due to normal procluc-
tion tolerances.
r Readings are taken under no-signal conditions with
a VOM (50
ko/V).
o Switch
Rs{.
No. Switch Porition
s1
s2
s101
s801
s802
s803
POWER
VOLTAGESELECTOR
(AEP,
G-AEP,
UK.
EMODEL)
OPERATION
METER
INPUT
SPEAKER
OFF
STEREO
OFF
FIXID
A+ B
-20-