Sony Trinitron KV-27SXR10 User manual

ou,
73
US
Model
Chassis
No.
SCC-5951-A
Canadian
Model
Chassis
No.
SCC-607H-A
4s
B
CHASSIS
Note: The service manual for RM-755 has |
MODELS
OF
THE
SAME
SERIES
been issued separately. |
KV-27SXR10
|
fe
SPECIFICATIONS
American TV standard
VHF: 2-13
UHF: 14-69
Cable TV: 1-125
Microblack Trinitron tube
27-inch picture measured diagonally
28-inch picture tube measured
diagonally
VIDEO INPUT 1, 2 and 3 (phono
jacks)
Video: 1 Vp-p, 75-ohms
unbalanced, sync negative
Audio: 500 m¥rms (100%
modulation)
impedance: 47 kilohms
S VIDEO INPUT (4-pin mini DIN)
Y: 1 Vp-p, 7o0hms unbalanced,
sync negative
C: 0.286 Vp-p (Burst signal)
75-ohms
Television system
Channel coverage
Picture tube
tnput
Output
Power requirements
Power consumption
Accessories supplied
Optional accessories
MONITOR
OUTPUT
(phono
jacks)
Video:
1
Vp-p,
75-ohms
unbalanced,
sync
negative
Audio:
500
mVrms
(100%
modulation)
impedance:
10
kilohms
AUDIO
OUTPUT
(VARIABLE)
(phono
jacks)
More
than
408
mvVrms
at
the
maximum
volume
setting
(variable)
(100%
modulation)
impedance:
10
kilohms
170W (max.}
1W
(in
standby
condition)
Remote
Commander
RM-755
with
2
size
AA
batteries
Antenna connector
U/V mixer EAC-66
Connecting
cord
VMC-810S/8208
RK-74A
Design
and
specifications
subject
to
change
without
notice.
ee
a |
MICROFILM
TRINITRON
COLOR

AN ISOLATION TRANSFORMER SHOULD BE USED
DURING ANY SERVICE TO AVOID POSSIBLE SHOCK
HAZARD, BECAUSE OF LIVE CHASSIS.
THE CHASSIS OF THIS RECEIVER IS DIRECTLY CON.
NECTED TO THE AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY SHADING AND MARK
A ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL TO
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS
THAT ARE CRITICAL TO SAFE OPERATION ARE
IDENTIFIED IN THIS MANUAL. FOLLOW THESE PRO-
CEDURES WHENEVER CRITICAL COMPONENTS ARE
REPLACED OR IMPROPER OPERATION !S SUSPECTED.
AFIN
D’EVITER
TOUT
RISQUE
D’ELECTROCUTION
PROVENANT
D’UN
CHASSIS
SOUS
TENSION,
UN
TRANSFORMATEUR
D'ISOLEMENT
DOIT
ETRE
UTILISE
LORS
DE
TOUT
DEPANNAGE.
LE
CHASSIS
DE
CE
RECEPTEUR
EST
DIRECTEMENT
RACCORDE
A
L’ALIMENTATION
SECTEUR.
ATTENTION
AUX
COMPOSANTS
RELATIFS
ALA
SECURITE!
LES
COMPOSANTS
IDENTIFIES
PAR
UNE
TRAME
ET
PAR
UNE
MARQUE
/\
SUR
LES
SCHEMAS
DE
PRINCIPE,
LES
VUES
EXPLOSEES
ET
LES
LISTES
DE
PIECES
SONT
D'UNE
IMPORTANCE
CRITIQUE
POUR
LA
SECURITE
DU
FONCTIONNEMENT.
NE
LES
REM-
PLACER
QUE
PAR
DES
COMPOSANTS
SONY
DONT
LE
NUMERO
DE
PIECE
EST
INDIQUE
DANS
LE
PRESENT
MANUEL
OU
DANS
DES
SUPPLEMENTS
PUBLIES
PAR
SONY.
LES
REGLAGES
DE
CIRCUIT
DONT
L’IMPOR-
TANCE
EST
CRITIQUE
POUR
LA
SECURITE
DU
FONCTIONNEMENT
SONT
IDENTIFIES
ANS
LE
PRESENT
MANUEL.
SUIVRE
CES
PROCEDURES
LORS
DE
CHAQUE
REMPLACEMENT
DE
COMPOSANTS
CRITIQUES,
OU
LORSQU’UN
MAUVAIS
FONCTIONNE-
MENT
EST
SUSPECTE.
|
i
KV-27SXR10 |
RM-755 i
TABLE OF CONTENTS
Section
Title
Page
Section
Title
Page
1.
GENERAL
4,
SAFETY
RELATED
ADJUSTMENTS
.....
16
1-1. Location and Function of Controls ........ 4
TD
(Operations.
aud
4
tas
Bay
Ee
eo
6
5.
CIRCUIT
ADJUSTMENTS
1-3.
Presetting
Channels.........-......2--
7
5-1.
A
Board
Adjustments
..........0+025003
19
1-4.
Applications
with
Optional
Equipment
......
8
5-2.
D
Board
Adjustments
..........---00055
21
1-5. Troubleshooting .. 64.0.4 e ee eee lat 9
6. DIAGRAMS
2.
DISASSEMBLY
6-1.
Printed
Wiring
Boards
....
0.2.0.0
00
re
23
2-1,
Rear
Cover
Removal
...............0.0-.
10
6-2.
Circuit
Boards
Location
...........++505
27
2-2.
Main
Chassis
Removal
..............05.
10
6-3.
Schematic
Diagrams
..........-00
250058
27
2-3.
Service
Position
..........2
2.2005
ce
eee
10
6-4.
“Semiconductors:
xcs
vir
ets
ag
eee
ss
PAS
41
2-4. Picture Tube Removal ..............004. 11
7. EXPLODED VIEWS
3.
SET-UP
ADJUSTMENTS
721
Rear:
Cover
=
4...
ak
eed
GE
AE
GES
eS
42
3.7
“Beam
Wanding'2.0.2¢
kia
Mia
se
os
Sy
Aes
12
7220
Pictire
Vube
eh
ee
oe
PP
43
3-2), “Gorivergente: jek Sih fe eee aS EY A 13
3-3.
Focus
Adjustment
.............0.000.
15
8.
ELECTRICAL
PARTS
LIST........---.
44
3-4. White Balance ...........0- 00000 ca ee 15
WARNING 1! ATTENTION!

KV-278
XRIO
RM-75
SAFETY
CHECK-OUT
(US
MODEL
ONLY)
After
correcting
the
original
service
problem,
perform
the
following
safety
checks
before
releasing
the
set
to
the
customer:
1.
Check
the
area
of
your
repair
for
unsoldered
or
poorly-soldered
connections.
Check
the
entire
board
surface
for
solder
splashes
and
bridges.
3
2.
Check
the
interboard
wiring
to
ensure
that
no
wires
are
‘pinched’?
or
contact
high-wattage
resistors.
3.
Check
that
all
control
knobs,
shields,
covers,
ground
straps,
and
mounting
hardware
have
been
replaced.
Be
absolutely
certain
that
you
have
replaced
all
the
insulators.
4.
Look
for
unauthorized
replacement
parts,
par-
ticularly
transistors,
that
were
installed
during
a
previous
repair.
Point
them
out
to
the
customer
and
recommend
their
replacement.
LA
Look
for
parts
which,
though
functioning,
show
obvious
signs
of
deterioration.
Point
them
out
to
the
customer
and
recommend
their
replace-
ment.
6.
Check
the
line
cord
for
cracks
and
abrasion.
Recommend
the
replacement
of
any
such
line
cord
to
the
customer.
7.
Check
the
condition
of
the
monopole
antenna
(if
any).
Make
sure
the
end
is
not
broken
off,
and
has
the
plastic
cap
on
it.
Point
out
the
danger
of
broken
the
recommend
ntenna’s
antenna to
the a
on a
and
replacement.
impalement
customer,
8
Check
the
B+
and
HV
to
see
they
are
at
the
values
specified.
Make
sure
your
instruments
are
accurate;
be
suspicious
of
your
HV
meter
if
sets
always
have
low
HV.
9.
Check
the
antenna
terminals,
metal
trim,
“metallized”
knobs,
screws,
and
all
other
exposed
metal
parts
for
AC
leakage.
Check
leakage as described below.
To Exposed Meta!
Parts on Set
|
AC i
voltmeter
(0.75 V} |
i
|
iu |
O15 pF + S1.540
y
1
om
Earth Ground
Fig.
A.
Using
an
AC
voltmeter
to
check
AC
leakage.
|
LEAKAGE TEST
The
AC
leakage
from
any
exposed
metal
part
to
earth
ground
and
from
all.exposed
metal
parts
to
any
exposed
metal
part
having
a
return
to
chassis,
must
not
exceed
0.SmA (S00
microampers).
current
can
be
measured
by
any
one
of
three
methods.
Leakage
1.
A
commercial
leakage
tester,
such
as
the
Simpson
229
or
RCA
WT-S40A.
Follow
the
manufacturers’
instructions
to
use
these
instru-
ments.
to
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
means
of
a
VOM
or
battery-operated
AC
volt-
meter.
The
“limit”
indication
is
0.75
V,
so
meters must have an
The Simpson 250 and Sanwa
SH-63Trd
are
examples
of
a
passive
VOM
that
is
suitable.
Nearly
all
battery
operated
digital
2V AC range are
analog
accurate
low-
voltage scale.
multimeters that have a
suitable. (See Fig. A)
HOW TO FIND A GOOD EARTH GROUND
A cold-water pipe is guaranteed earth ground, the
cover-plate retaining screw on most AC outlet boxes is
also
at
earth
ground.
If
the
retaining
screw
is
to
be
used
as
your
earth-ground,
verify
that
it
is
at
ground
by
measuring
the
resistance
between
it
and
a
cold-
water
pipe
with
an
ohmmeter.
The
reading
should
be
zero
ohms.
If
a
cold-water
pipe
is
not
accessible,
connect
a
60-100
watts
trouble
light
(not
a
neon
lamp)
between
the
hot
side
of
the
receptacle
and
the
retaining
screw.
Try
both
slots,
if
necessary,
to
locate
the
hot
side
of
the
line,
the
lamp
should
light
at
norma!
brilliance
if
the
screw
is
at
ground
potential.
(See Fig. B)
Trouble Light
Ohmmeter
Cold-water Pipe
Fig.
8.
Checking
for
earth
ground.
|

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KV-27SXR10
RM-755
SECTION 2
DISASSEMBLY
2-1. REAR COVER REMOVAL
(T>
~
four screws
ra
(3) two screws
(BVTP4 x 16)
a
(2) four screws
(BVTP4 x 16)
2-3, SERVICE POSITION
QD Insert A block assembly into
the two holes of main chassis.
2-2, MAIN CHASSIS REMOVAL
BY
@) Turn it 80° in the direction of arrow.
40s: