SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.52105B
2003/6
REAR PROJECTION TELEVISION
52105B
2003
6
AV-48WP74/AHA,
AV-56WP74/AHA
The following items for the AV-48WP74/AHA and AV-56WP74/AHA model were changed partly from AV-
48WP74/HA and AV-56WP74/HA model.
Therefore, this service manual describes only the items which differ from those of the AV-48WP74/HA and
AV-56WP74/HA model service manual.
For details other than those described in this manual, please refer to the AV-48WP74/HA and AV-56WP74/
HA model service manual (No.52105, 2003/04).
OUTLINE
HOW TO IDENTIFY MODELS
Since the mirror was changed, we have issued the SERVICE MANUAL for AV-48WP74/AHA and AV-56WP74/
AHA.
MODEL
A suffix "AHA" is added to the serial No. after at the rating label.
Indicated
SERIAL No.
"AHA"
AV-48WP74
AV-56WP74
BASIC CHASSIS
SB3
Supplementary
(No.52105B)
AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan
VICTOR COMPANY OF JAPAN, LIMITED
Printed in Japan
WPC
DIFFERENCE LIST
EXPLODED VIEW PARTS LIST -1 (Page 3-2)
EXPLODED VIEW -1
Ref. No.
PARTS No.
PARTS NAME
DESCRIPTION
AV-48WP74/HA
AV-48WP74/AHA
4
QYSBSF4012Z
------------
TAP SCREW (X2)
Delete
5
LC31752-001A-A
------------
MIRROR BRACKET (X2)
Delete
23
LC31733-001A-A
LC32173-003A-A
MIRROR
Glass
70
------------
QYSBSF4012Z
TAP SCREW (X13)
Addition
71
------------
LC21316-001A-A
MIRROR HOLDER TOP
Addition
72
------------
LC21317-001A-A
MIRROR HOLDER BOTTOM Addition
73
------------
LC21311-001B-A
MIRROR HOLDERLEFT
Addition
74
------------
LC21311-002B-A
MIRROR HOLDER RIGHT
Addition
Ref. No.
PARTS No.
PARTS NAME
DESCRIPTION
AV-56WP74/HA
AV-56WP74/AHA
4
QYSBSF4012Z
------------
TAP SCREW (X2)
Delete
5
LC41419-001A-A
------------
MIRROR BRACKET (X2)
Delete
6
QYSBSF4012Z
------------
TAP SCREW (X2)
Delete
23
LC31954-001A-A
LC32173-002A-A
MIRROR
Glass
70
------------
QYSBSF4012Z
TAP SCREW (X13)
Addition
71
------------
LC21316-001A-A
MIRROR HOLDER TOP
Addition
72
------------
LC21317-001A-A
MIRROR HOLDER BOTTOM Addition
73
------------
LC21311-001B-A
MIRROR HOLDERLEFT
Addition
74
------------
LC21311-002B-A
MIRROR HOLDER RIGHT
Addition
23
71
70
70
73
74
72
70
SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.52105
2003/4
AV-48WP74
AV-56WP74
REAR PROJECTION TELEVISION
52105
2003
4
AV-48WP74/HA,
AV-56WP74/HA
TABLE OF CONTENTS
1
PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
4
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64
BASIC CHASSIS
SB3
AV-48WP74
AV-56WP74
1-2 (No.52105)
SPECIFICATION
Design & specifications are subject to change without notice.
Items
Contents
AV-48WP74
AV-56WP74
Dimensions (W x H x D)
120.0cm x 124.4cm x 60.9cm
( 47 1/4" x 49" x 24" )
136.8cm x 138.6cm x 66.7cm
( 53 7/8" x 54 5/8" x 26 3/8" )
Mass
81kg (179 Ibs)
95kg (209 Ibs)
TV RF System
Color System
Sound System
CCIR (M)
NTSC
BTSC System (Multi Channel Sound)
TV Receiving Channels and
Frequency
VL Band
VH Band
UHF Band
(02~06) 54MHz~88MHz
(07~13) 174MHz~216MHz
(14~69) 470MHz~806MHz
CATV Receiving Channels and
Frequency
Low Band
High Band
Mid Band
Super Band
Hyper Band
Ultra Band
Sub Mid Band
54MHz~804MHz
(02~06, A-8) by (02~06 & 01)
(07~13) by (07~13)
(A~1) by (14~22)
(J~W) by (23~36)
(W+1~W+28) by (37~64)
(W+29~W+84) by (65~125)
(A8, A4~A1) by (01, 96~99)
TV/CATV Total Channel
180 Channels
Antenna Terminal (VHF/UHF)
75ohm unbalanced F-type connector
Intermediate Frequency
Video IF Carrier
Sound IF Carrier
45.75MHz
41.25MHz (4.5MHz)
Color Sub Carrier
3.58MHz
Power Input
Power Consumption
120V AC, 60Hz
248W (Max)
Screen
Transparent screen (unitized fresnel lens/double lenticular lens)
Screen Size
48" (122cm) Measured diagonally, 16:9 ratio
(W:106.3 cm x H:59.8 cm)
56" (142cm) Measured diagonally, 16:9 ratio
(W:124 cm x H:69.8 cm)
Projection Tube
High Voltage
17cm (6.7") tube x 3 ( R/G/B )
31kV±1.0kV (at zero beam current)
Speaker
Audio Power Output
16cm round x 2 (Woofer), 5.5cm round x 2 (Tweeter)
10W+10W
External Input
Video Input
Audio Input
S-Video
Component Input
1V (p-p), 75ohm (RCA pin jack x 4)
500mV(rms) ( -4dBs), high impedance (RCA pin jack x 8)
Y: 1V (p-p) positive, 75ohm negative sync provided
C: 0.286V(p-p) (burst signal)
Mini-DIN 4pin connector x 2
Y: 1V (p-p), 75ohm (RCA pin jack x 2)
Pb: ±0.35V(p-p), 75ohm (RCA pin jack x 2)
Pr: ±0.35V(p-p), 75ohm (RCA pin jack x 2)
1080i DTV (digital broadcast) ready
Digital Input
Audio Input
DVI-D signal link 19pin connector
(Digital-input terminal is not compatible with computer signal)
500mV(rms) ( -4dBs), high impedance (RCA pin jack x 2)
Subwoofer Output
More than 0 to 1000mV (rms) (+2.2dBs) (RCA pin jack x1)
Audio Output (VARI/FIX)
VARI : More than 0 to 1000mV (rms) (+2.2dBs)
FIX : 500mV(rms) (-4dBs), low impedance (1kHz when modulated 100%)
(RCA pin jack x 2)
Speaker Input
45W 16ohm (maximum input)
AV Compulink lll
Ø3.5mm mini jack
Remote Control Unit
RM-C1200G (AA/R6/UM-3 battery x 2)
AV-48WP74
AV-56WP74
(No.52105)1-3
SECTION 1
PRECAUTIONS
1.1 SAFETY PRECAUTIONS
(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 that 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) Use isolation transformer when hot chassis.
The chassis and any sub-chassis contained in some products are
connected to one side of the AC power line. An isolation transformer
of adequate capacity should be inserted between the product and the
AC power supply point while performing any service on some
products when the HOT chassis is exposed.
(5) 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 with a measuring
apparatus
(oscilloscope
etc.)
the
LIVE
side
GND
and
ISOLATED(NEUTRAL) side GND or EARTH side GND at the same
time.
If above note will not be kept, a fuse or any parts will be broken.
(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) If any repair has been made to the chassis, it is recommended that
the B1 setting should be checked or adjusted (See ADJUSTMENT
OF B1 POWER SUPPLY).
(8) 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.
(9) 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.
(10) 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, screwheads, 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 1100V 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 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 ohms per volt or more sensitivity in
the following manner. Connect a 1500ohm 10W resistor
paralleled by a 0.15µF 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.).
(11) High voltage hold down circuit check.
After repair of the high voltage hold down circuit, this circuit shall be
checked to operate correctly.
See item "How to check the high voltage hold down circuit".
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
PWB
White line side
WHT
PW
POWER CORD
REPLACEMENT WARNING.
Connecting the white line side of power
cord to "WHT" character side.
A
V
This mark shows a fast
operating fuse, the
letters indicated below
show the rating.