SERVICEMANUAL
US Model
Chassis No.
Canadian Model
Chassis No.
BA-1 CHASSIS
MODELS OF THE SAME SERIES
Television
system
Channel
coverage
Picture tube
Antenna
Input
SPECIFICATIONS
American TV standards
VHF: 2-13
UHF:
14-69
CABLE TV: 1-125
Hi-Black
tube
20-inch picture measured diagonally
21-inch picture tube measured diagonally
75 ohm external antenna
terminal
for
VHF/UHF
VIDEO AND
VIDEO
S VIDEO IN (S terminal)
1 Vp-p,
unbalanced,
sync negative
C: 0.286 Vp-p (Burst signal)
Video (phono jacks) :
1 Vp-p,
unbalanced, sync negative
Audio (phono jacks) :
500
(100% modulation)
Impedance : 47 kilo-ohms
Speaker output
(4 ohms)
Speaker size
Full range 80 mm
units
Audio frequency
response
Power
requirements
120 V AC,
Power
consumption
120W
Standby mode
4w
Dimensions
(w/h/d)
550X464.7X471.3
mm
X
X 185/s inches)
Weight
24.0 kg (52 Ibs 15 oz)
Supplied accessories Remote Commander
RM-Y117 (1)
with
1 size AA (R6)
Recommended
accessories
EVEREADY batteries
U/V mixer EAC-66
Connecting cable
VMC-720M
RK-74A
Design and specifications are subject to change without notice.
TV
TABLE OF CONTENTS
Section
1.
GENERAL
l-l.
lntroducting the Sony
..........................
4
1-2.
Locating the Controls .........................................................
4
l-3.
Using the ON-SCREEN Menus .........................................
6
l-4.
Connecting
Equipment
............................................
7
l-5.
Watching
TV Programs ......................................................
8
l-6.
Using Convenient
Features ...............................................
9
l-7.
Using Closed Caption
........................................................
9
1-8.
Adjusting Picture and Sound Quality .................................
10
l-9.
Using the
Timer-Activated Functions .................................
13
l-1 0. Customizing
the Screen
Display ........................................
16
l-l 1. Using the Pre-Programmed Remote Commander ............
18
l-1 2. Troubleshooting
.................................................................
20
2.
2-1.
2-2.
2-3.
3.
3-l.
3-2.
3-3.
3-4.
3-5.
3-6.
DISASSEMBLY
Rear Cover Removal .........................................................
21
Service Position .................................................................
21
Picture Tube Removal .......................................................
22
SET-UP ADJUSTMENTS
Beam Landing ....................................................................
23
Convergence ......................................................................
24
Focus .................................................................................
26
Screen (G2) .......................................................................
26
Method of Setting the Service Adjustment Mode ..............
26
White Balance Adjustments ...............................................
26
WARNING!!
ATTENTION!!
AN ISOLATIONTRANSFORMER SHOULD BE USED DURING ANY
SERVICE TO AVOID POSSIBLE SHOCK HAZARD, -BECAUSE OF
LIVE CHASSIS.
THE CHASSIS OF THIS RECEIVER IS DIRECTLY CONNECTED TO
THE AC POWER LINE.
D'EVITER TOUT RISQUE D'ELECTROCUTION PROVENANT
D'UN CHASSIS
TENSION, UN TRANSFORMATEUR
D'ISOLEMENT
ETRE
LORS DETOUT
LE
DECE
A L'ALIMENTATION SECTEUR.
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
PROCEDURES
WHENEVER
CRITI-
CAL COMPONENTS ARE REPLACED OR IMPROPER OPERA-
TION IS SUSPECTED.
4.
SAFETY RELATED ADJUSTMENTS ..................... 27
5.
CIRCUITADJUSTMENTS
5-l.
Electrical
Adjustment
by
Remote
Commander ..................
29
5-2.
A Board Adjustments .........................................................
31
6.
6-i.
6-2.
6-3.
6-4.
DIAGRAMS
Block Diagram
....................................................................
35
Circuit Boards Location ......................................................
39
Printed Wiring Boards and Schematic Diagrams ..............
39
l
A Board ............................................................................
40
l
G Board.. ..........................................................................
47
l
UA Board .........................................................................
50
l
Board ............................................................................
51
l
C Board.. ..........................................................................
53
Semiconductors .................................................................
56
7.
EXPLODED VIEWS
7-1.
Chassis ..............................................................................
57
7-2.
Picture Tube .......................................................................
58
6.
ELECTRICAL PARTS LIST ....................................
ATTENTION
AUX
COMPOSANTS
RELATIFS
ALA
LES COMPOSANTS
PAR UNE TRAME ET PAR UNE
MAPQUE
A SUR LES
DE PRINCIPE, LES VUES
ET LES
DE PIECES CONT D'UNE
IMPORTANCE
CRITIQUE
POUR
LA
DU
FONCTIONNEMENT.
NE
LES
REMPLACER
QUE
PAR
DES
COMPOSANTSSONY DONT LE
DE
EST
DANS LE
MANUEL OU DANS DES
PAR
SONY.
LES
DE CIRCUIT DONT
L'IMPORTANCE EST CRITIQUE POUR LA
DU
FONCTIONNEMENT
SONT
IDENTIFIES
DANS
LE
MANUEL.
CES
LORS DE CHAQUE
REMPLACEMENT
DE
COMPOSANTS
CRITIQUES,
OU
LORSQU'UN
FONCTIONNEMENT EST
SAFETY CHECK-OUT
(US Model only)
Aftercorrectingtheoriginal
safety checks before releasing the set to the customer:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes
and bridges.
Check the interboard wiring to ensure that no wires are "pinched"
or
contact
high-wattage
resistors.
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.
Look
for
unauthorizedreplacement
parts,
particularly
transistors,
that were installed during a previous repair Point them out to the
customer
and
recommend
their
replacement.
Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend
their
replacement.
Check the line cord for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
Check the condition of the
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.
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.
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
= Earth Ground
LEAKAGE
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 0.5
(500
Leakage
current can be measured by any one of three methods.
1.
A commercial leakage tester, such as the Simpson 229 or RCA
Follow the manufacturers' instructions to use these
instruments.
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 voltmeter. 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 coldwater pipe
with an ohmmeter. The reading should be zero ohms. If a cold-water
pipe is not accessible, connect a
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
Cold-water Pipe
Fig. B. Checking for earth ground.
Fig. A. Using an AC voltmeter to check AC leakage.
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts from
the Operating Instruction Manual. The page numbers of the Operating
Instruction Manual remein as in the manual.
l-l.
THE SONY
TV
1-2.
LOCATING THE CONTROLS
,
display for volume,
or sound
CURRENT
TIME
For details, see
indicated by
numbered black circles
Channel number display
Main picture input mode
SLEEP, MUTING displays
CHANNEL
CAPTION
display
MTS mode (MAIN, SAP or
MONO)
AV input jack door
the same
also
on the Remote
Commander (pp. 9
cks
VIDEO IN jack
VIDEO 1 IN jacks
VIDEO 3 IN jacks
VHF/UHF
antenna terminal
AUDIO OUT jacks