Sony TRINITRON KV-8AD12 User manual

KV-BAD
RM-793
SERVICE MANUAL
This service manual is only for a kitchen holder of KV-8AD12.
In case of repair of a TV set itself, Please use the service
manual for KV-8AD11/8AD14.
Television system
Channel coverage
Picture tube
Antenna
Speaker
Inputs
Output
MICROFILM
SPECIFICATIONS
American TV standard, NTSC color
VHF channels 2 — 13
UHF channels 14 — 69
CATV channels 1 — 125
(181 total receivable channels)
Trinitron tube
8-inch picture measured diagonally
9-inch picture tube measured diagonally
70-degree deflection
VHF/UHF telescopic antenna
77mm round (3% inches)
VIDEO IN jacks
VIDEO: RCA phono-type 1 Vp-p, 75 ohms
AUDIO: RCA phono-type monaural
EXT ANT (Combined CATV/VHF/UHF 75-ohm, F-type)
Earphone jack
ViDEO OUT jacks
VIDEO: RCA phono-type
AUDIO: RGA pnono-type monaural
Power requirements
Power consumption
Dimensions
Weight
Supplied accessories
Optional accessories
MODELS OF THE SAME SERIES
US Model
Chassis No. SCC-E73C-A
120 V AC, 60 Hz
12/24 V DC
AC IN: 41 W max.
DC IN: 32 W max.
Approx. 239 x 197 x 310 mm (w/h/d)
(9'/2 x 77/a x 12% inches)
Approx. 5.0 kg (11 Ib)
Remote Commander RM-793 (1)
with 2 size AA (R6) batteries
AC power cord (1)
Telescopic antenna (1)
Car battery cord DCC-17AW (1)
Brackets for shelf installation (2)
M6 x 35 bolts (4)
M6 nuts (4)
Connecting cord VMC-920MS
Design and specifications are subject to change without notice.
TRINITRON- COLOR TV
ONY.

RM-793
KV-8AD12
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KV-8AD12
RM-793
2. EXPLODED VIEW AND PARTS LIST ©
REF.NO. PART NO. DESCRIPTION
1 9-902-252-01 HOLDER-KITCHEN-U
2 9-902-253-01 HOLDER-KITCHEN-B
3 9-902-254-01 HOLDER-ANTENNA
4 9-902-255-01 SHEET-STEAM
9-964-771-01
ACCESSORIES AND PACKING MATERIALS
HKEREELEEEKE RE EKER E LEER LAKES EET EE
REMARK PART NQ.
1-465-959-01
3-754-700-21
9-901-585-01
9-901-608-01
9-902-256-01
9-902-257-01
9-902-258-01
*9-90)2-259-01
*9-902-260-01
*9-902-265-01
Sony Corporation
TV Group
—4—
DESCRIPTION
REMOTE COMMANDER (RM-793)
MANUAL, INSTRUCTION
CUSHION
ROD ANTENNA
PAPER-PATTERN
BOLT, HEXAGON
NUT, HEXAGON
PACKING-CASE (SET)
PACKING-CASE (BRACKET)
PACKING-BAG-B
REMARK
English
91LU0542-1
Printed in Japan
© 1991. 12

MICROFILM
KV-8
~
SERVICE
MANUAL
Television system
Channel coverage
Picture tube
Antenna
Speaker
Inputs
Output
Power requirements
Power consumption
- Dimensions
US Model
KV-8AD11
Chassis No. SCC-E73A-A
KV-8AD14
Chassis No. SCC-E73B-A
Canadian
Model
KV-8ADI11
Chassis No. SCC-E74A-A
MODELS
OF
THE
SAME
SERIES
KV-8AD11/8AD14
SPECIFICATIONS
American TV standard, NTSC color
VHF channels 2 - 13
UHF channels 14 - 69
CATV channels 1 — 125
(181 total receivable channels)
Trinitron tube
8-inch picture measured diagonally
9-inch picture tube measured diagonally
70-degree deflection
VHF/UHF telescopic antenna
77mm round (3% inches)
VIDEO IN jacks
VIDEO: RCA phono-type 1 Vp-p, 75 ohms
AUDIO: RCA phono-type monaural
EXT
ANT
(Combined
CATV/VHF/UHF
75-ohm,
F-type)
Earphone jack
VIDEO OUT jacks
VIDEO: RCA phono-type
AUDIO: RCA pnono-type monaural
120 V AC, 60 Hz
12/24 V DC
AC IN: 41 W max.
DC IN: 32 W max.
Approx. 239 x 197 x 310 mm (w/h/d)
(9/2 x 77/s x 12% inches)
Weight
Cabinet color
Supplied accessories
Optional accessories
Approx. 5.0 kg (11 Ib)
KV-8AD11: gray
KV-8AD14: white
Remote
Commander
with
2
size
AA
(R6)
batteries
(1)
RM-792
(KV-8AD11)
RM-793
(KV-8AD14)
AC power cord (1)
Telescopic antenna (1)
Car battery cord DCC-17AW (1)
Connecting cord VCM-920MS
Design
and
specifications
are
subject
to
change
without
notice.
TRINITRONe
COLOR
TV
SONY.

KV-8AD11/8AD14
RM-792/793
TABLE OF CONTENTS
Section Title Page Section Title Page
1. GENERAL 4. SAFETY RELATED ADJUSTMENTS .-.:---:-- 21
L415 Identifying the Parts --ccccce cree er eee erence 5
1-2.
Preparing
for
Use
-++++seeeeettt
eet
e
eter
reese
6
5.
CIRCUIT
ADJUSTMENTS
1-3. Watching TV Programs -+++++++2+se0rett tees 9
1-4.
Adjusting
Picture
Quality
Abt
Neds
tere
tet
a
BARN
Set
eh
10
5-1.
A
Board
Adjustments
eae
ra
23
1-5. Using Other Convenient Features -----++++++++: 10 5-2. D Board Adjustments -++++++++ttttrrrrstesees 23
1-6. Connecting Video Equipment -++++-+-+++++++++> 11
6. DIAGRAMS
2.
DISASSEMBLY
6-1.
Block
Diagram
+++
+++ertee
teeter
errr
eee
eee
eens
25
91...
Cover
Removal’
ssi
set
artiiaee
te
eenatetet
13
6-2.
Circuit
Boards
Location
--++*++--
Sear
ne
si
28
2-2. Speaker and F Board Removal -+++--+++*+++++* 13 6-3. Printed Wiring Boards and Schematic Diagrams -- 29
5's
Beans
Reais
yal:
aoe
oon
eneee
14
6-4.
Semiconductors
«+--+:
ssecee
este
e
tent
eeneees
Al
9A: Service Position: ins ioe ena Ree ae eee we ea ee 14
LE.
yPilice
Tahe
Reiioualocaneeubeuesiebauaace
is
7
EXPLODED
VIEW
2006-2
¢cs0aeeseecdeesawnane
42
2
SELUP
AOAUS
MENTS
8.
ELECTRICAL
PARTS
LIST
---..-------.0---
43
3-1. Beam Landing --+++++rtersee eee e rere eeeees 17
3-2. Convergence <++srrrrrrrrr eset eeeee eens 18
B23." SRogus:. Bs etn Pasi teen tee eRe ee Ea babes 20
3-4. Screen (G2) and White Balance --++++++++++-++- 20
ra

CAUTION
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE
AND THE ANODE CAP TO THE METAL CHASSIS, CRT
SHIELD, OR CARBON PAINTED ON THE CRT, AFTER
REMOVING THE ANODE.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY SHADING AND MARK
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-
CEOURES WHENEVER CRITICAL COMPONENTS ARE
REPLACED OR IMPROPER OPERATION IS SUSPECTED.
ATTENTION
APRES AVOIR DECONNECTE LE CAP DE L’ANODE,
COURT-CIRCUITER L’ANODE DU TUBE CATHODIQUE
ET CELUI DE L’ANODE DU CAP AU CHASSIS
METALLIQUE DE L’APPAREIL, OU AU COUCHE DE
CARBONE PEINTE SUR LE TUBE CATHODIQUE OU AU
BLINDAGE DU TUBE CATHODIQUE.
ATTENTION AUX COMPOSANTS RELATIFS A LA
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 DANS LE
PRESENT MANUEL. SUIVRE CES PROCEDURES LORS
DE CHAQUE REMPLACEMENT DE COMPOSANTS
CRITIQUES, OU LORSQU’UN MAUVAIS FONCTIONNE-
MENT EST SUSPECTE.
KV-8AD11/8AD14
RM-792/793
i
{
|
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KV-8AD11/8AD14
RM-792/793
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.
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.
$5. 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
impalement on a broken antenna to the
customer, and recommend the antenna’s
replacement.
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 Metal |
Parts on Set
Ac
voltmeter
| (0.75 V)}
0.15 pF
= 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 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods. ;
1. A commercial leakage tester, such as. the
Simpson 229 or RCA WT-540A. Follow the
manufacturers’ instructions to use these instru-
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
means of a VOM or battery-operated AC volt-
meter. The “limit” indication is 0.75 V, 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)
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
normal brilliance if the screw is at ground potential.
(See Fig. B)
Trouble Light
“- Ohmmeter
= AC Outlet Box
Cold-water Pipe
Fig. B. Checking for earth ground.

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| KV-8AD11/8AD14
RM-792/793 _|
SECTION 2
DISASSEMBLY
2-1. COVER REMOVAL
NOTE:
Follow
the
disassembly procedure
in
the
numerical
over
given.
Jf @® Handle
ae @ Cover
@ Two screws
(BVTP4 X12)
@ Two screws
(BVTP4X 12)
2-2. SPEAKER AND F BOARD REMOVAL
@ F board
ee, oc oe

KV-8AD11/8AD14
RM-792/793
2-3. D BOARD REMOVAL
@ Remove the bottom assembly in the direction
of arrow ®) after leaning it in the direction of
@ C board arrow@).
x
Proceed
in
the
reverse
order
when
installing
it.
® D board
@ Anode cap
® Three claws
Cushion
©)
AC
inlet
Four claws
2-4. SERVICE POSITION

KV-8AD11/8AD14 |
RM-792/793
|
|
2-5.
PICTURE
TUBE
REMOVAL
|
|
|
@ Four screws
(BVTP4 Xx 12)
@) Picture tube shield
Before replacing the CRT, use the DGC
holder for the CRT as shown in the
illustration, and wind the DGC.
® Coil,demagnetization
@® Deflection yoke
® Picture tube
Cushion
Note
:
Short
circuit
the
anode
of
the
picture
tube
and
the
anode
cap
to
the
metal
chassis,CRT
shieldjor
carbon
painted
on
the
CRT
after
removing the anode.
‘** REMOVAL OF ANODE-CAP
« REMOVING PROCEDURES
| . : 3
a)
a
Anode
button
@
Turn
up
one
side
of
the
rubber
cap
in
@
Using
a
thumb
pull
up
the
rubber
cap
@
When
one
side
of
the
rubber
cap
is
the
direction
indicated
by
the
arrow
@.
firmly
in
the
direction
indicated
by
the
separated
from
the
anode
button,
the
arrow
©).
anode-cap
can
be
removed
by
turning
up
the
rubber
cap
and
pulling
up
it
in
the direction of the arrow ©.
-
HOW
TO
HANDLE
AN
ANODE-CAP
alee,
©
@ Don't hurt the surface of anode-caps with
sharp shaped material!
@ Don’t press the rubber hardly not to hurt
inside of anode-caps!
A material fitting called as shatter-hook
terminal is built in the rubber.
@ Don't turn the foot of rubber over hardly!
The shatter-hook terminal will stick out or
hurt the rubber.

KV-8AD11/8AD14 |
RM-792/793