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SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.YA063
2004/3
COLOUR TELEVISION
YA063
2004
3
AV-28H4BU, AV-28H4SU,
AV-28H40SU, AV-28H77SK,
AV-32H4BU, AV-32H4SU,
AV-32H40SU, AV-32H47SU,
AV-32H77SK
TABLE OF CONTENTS
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5
TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
BASIC CHASSIS
ML2
1
2
3
4
5
6
7
8
9
0
P
AV
TV
OK
MENU
P
TV
AV-28H4SU, AV-28H4BU
AV-32H4SU, AV-32H4BU
AV-28H40SU, AV-28H77SK
AV-32H40SU, AV-32H77SK
AV-32H47SU


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1-2 (No.YA063)
SPECIFICATION
Design & specifications are subject to change without notice.
Item
Content
AV-28H4BU
AV-28H4SU
AV-28H40SU
AV-28H77SK
Dimensions ( W
× H × D )
76.2cm
× 52.8cm × 49.3cm
85.4cm
× 50.8cm × 49.0cm
Mass
39.0kg
TV RF System
CCIR (B/G, D/K, I, L)
CCIR (I)
Colour System
PAL
SECAM
NTSC 3.58 / NTSC 4.43 (Only in EXT mode)
PAL
NTSC 3.58 / NTSC 4.43
(Only in EXT mode)
Stereo System
A2 (B/G, D/K)
NICAM (B/G, I, D/K, L)
NICAM (I)
Teletext System
FLOF (Fastext)
TOP (German system)
WST (World standard system)
FLOF (Fastext)
WST(World standard system)
Receiving
Frequency
VHF 47MHz ~ 470MHz
---
UHF 470MHz ~ 862MHz
French CATV 116MHz ~ 172MHz
220MHz ~ 469MHz
---
Intermediate
Frequency
VIF 38.9MHz (B/G, D/K, I, L)
38.9MHz (I)
SIF 33.4MHz (5.5MHz:B/G)
32.9MHz (6.0MHz:I)
32.4MHz (6.5MHz:L, D/K)
32.9MHz (6.0MHz:I)
Colour Sub
Carrier Frequency
PAL 4.43MHz
SECAM 4.40625MHz / 4.25MHz
---
NTSC 3.58MHz / 4.43MHz
Power Input
AC220V ~ AC240V, 50Hz
Power Consumption
120W, standby : 2.5W
Aerial Input Terminal
75
unbalanced, coaxial
Picture Tube
Visible size : 66cm, Measured diagonally H : 58.3cm
× V : 33.0cm
High Voltage
31.0kV (+1kV / -1.5kV) (at zero beam current)
Speaker
13cm
× 6.5cm oval type × 2
Audio Power Output
10W + 10W
EXT-1 / EXT-2 / EXT-3
(Input / Output)
21-pin Euro connector, SCART socket
× 3
EXT-4 (Input)
S-Video
Video
Audio (L/R)
Mini-DIN 4 pin
× 1
Y : 1V(p-p) positive (negative sync, 75
)
C : 0.3V(p-p) (Burst signal, 75
)
1V(p-p) 75ohm, RCA pin jack
× 1
500mV(rms) (-4dBs), High impedance, RCA pin jack
× 2
AUDIO OUT (Variable)
0~1000mV(rms), Low impedance, RCA pin jack
× 2
Headphone Jack
3.5mm Stereo mini jack
× 1
Remote Control Unit
RM-C64H (AAA/R03 dry battery
× 2)


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(No.YA063)1-3
Design & specifications are subject to change without notice.
Item
Content
AV-32H4BU
AV-32H4SU
AV-32H40SU
AV-32H47SU
AV-32H77SK
Dimensions ( W
× H × D ) 86.4cm × 58.7cm × 55.0cm 94.6cm × 56.1cm × 54.7cm 94.8cm × 56.2cm × 55.0cm 94.6cm × 56.1cm × 54.7cm
Mass
53.0kg
52.5kg
53.0kg
TV RF System
CCIR (B/G, D/K, I, L)
CCIR (I)
Colour System
PAL
SECAM
NTSC 3.58 / NTSC 4.43 (Only in EXT mode)
PAL
NTSC 3.58 / NTSC 4.43
(Only in EXT mode)
Stereo System
A2 (B/G, D/K)
NICAM (B/G, I, D/K, L)
NICAM (I)
Teletext System
FLOF (Fastext)
TOP (German system)
WST(World standard system)
FLOF (Fastext)
WST
(World standard system)
Receiving
Frequency
VHF 47MHz ~ 470MHz
---
UHF 470MHz ~ 862MHz
French
CATV
116MHz ~ 172MHz
220MHz ~ 469MHz
---
Intermediate
Frequency
VIF 38.9MHz (B/G, D/K, I, L)
38.9MHz (I)
SIF 33.4MHz (5.5MHz:B/G)
32.9MHz (6.0MHz:I)
32.4MHz (6.5MHz:L, D/K)
32.9MHz (6.0MHz:I)
Colour Sub
Carrier Fre-
quency
PAL 4.43MHz
SECAM 4.40625MHz / 4.25MHz
---
NTSC 3.58MHz / 4.43MHz
Power Input
AC220V ~ AC240V, 50Hz
Power Consumption
130W, standby : 2.5W
Aerial Input Terminal
75
unbalanced, coaxial
Picture Tube
Visible size : 76cm, Measured diagonally H : 67.4cm
× V : 38.4cm
High Voltage
31.0kV (+1kV / -1.5kV) (at zero beam current)
Speaker
13cm
× 6.5cm oval type × 2
Audio Power Output
10W + 10W
EXT-1 / EXT-2 / EXT-3
(Input / Output)
21-pin Euro connector, SCART socket
× 3
EXT-4 (Input)
S-Video
Video
Audio (L/R)
Mini-DIN 4 pin
× 1
Y : 1V(p-p) positive (negative sync, 75
)
C : 0.3V(p-p) (Burst signal, 75
)
1V(p-p) 75ohm, RCA pin jack
× 1
500mV(rms) (-4dBs), High impedance, RCA pin jack
× 2
AUDIO OUT (Variable)
0~1000mV(rms), Low impedance, RCA pin jack
× 2
Headphone Jack
3.5mm Stereo mini jack
× 1
Remote Control Unit
RM-C64H (AAA/R03 dry battery
× 2)


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1-4 (No.YA063)
SECTION 1
PRECAUTION
1.1
SAFETY PRECAUTIONS [EXCEPT FOR UK]
(1) The design of this product contains special hardware,
many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special
safety-related
characteristics.
These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by (
) on the parts list in Service
manual. The use of a substitute replacement which does
not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : (
) side
GND, the ISOLATED (NEUTRAL) : (
) side GND and
EARTH : (
) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.
(5) If any repair has been made to the chassis, it is
recommended that the B1 setting should be checked or
adjusted (See B1 POWER SUPPLY check).
(6) The high voltage applied to the picture tube must conform
with that specified in Service manual. Excessive high
voltage can cause an increase in X-Ray emission, arcing
and possible component damage, therefore operation
under excessive high voltage conditions should be kept to
a minimum, or should be prevented. If severe arcing
occurs, remove the AC power immediately and determine
the cause by visual inspection (incorrect installation,
cracked or melted high voltage harness, poor soldering,
etc.). To maintain the proper minimum level of soft X-Ray
emission, components in the high voltage circuitry
including the picture tube must be the exact replacements
or alternatives approved by the manufacturer of the
complete product.
(7) Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting the other end of the lead through a 10k
2W resistor to the anode button.
(8) When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
(9) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000
per volt or more
sensitivity in the following manner. Connect a 1500
10W resistor paralleled by a 0.15
µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to
0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND


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(No.YA063)1-5
1.2
SAFETY PRECAUTIONS [FOR UK]
(1) The design of this product contains special hardware and many circuits and components specially for safety purposes. For
continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer.
Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel
only.
(2) Alterations of the design or circuitry of the product should not be made. Any design alterations or additions will void the
manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage
resulting therefrom.
(3) Many electrical and mechanical parts in the product have special safety-related characteristics. These characteristics are often
not evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacement
components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are
identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the
schematics and by (
) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the
same safety characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock,
fire, or other hazards.
(4) The leads in the products are routed and dressed with ties, clamps, tubing's, barriers and the like to be separated from live parts,
high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is
required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to
normal, after re-assembling.
WARNING
(1) The equipment has been designed and manufactured to meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant safety standards.
(4) It is essential that safety critical components are replaced by approved parts.
(5) If mains voltage selector is provided, check setting for local voltage.