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No.51900
Sep. 2001
AV-G2171
1
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
Sept. 2001
AV-G2171/EG
CONTENTS
! SPECIFICATIONS
2
! SAFETY PRECAUTIONS
3
! FEATURES
4
! FUNCTIONS
5
! SPECIFIC SERVICE INSTRUCTIONS
6
! SERVICE ADJUSTMENTS
11
! PARTS LIST
27
OPERATING INSTRUCTIONS
STANDARD CIRCUIT DIAGRAM
2-1
SERVICE MANUAL
COLOUR TELEVISION
BASIC CHASSIS
CL


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No. 51900
AV-G2171
2
SPECIFICATIONS
Item
Content
Dimensions(W×H×D)
60.3cm×45.5cm×47.4cm
Mass
21.6kg
TV RF System
B / G, D / K, K1, M
TV Mode
PAL / SECAM / NTSC3.58 / NTSC4.43
Colour System
VIDEO Mode
PAL / SECAM / NTSC3.58 / NTSC4.43
VHF (VL)
46.25MHz168.25MHz
VHF (VH)
175.25MHz463.25MHz
UHF
471.25MHz863.25MHz
CATV
" Cable TVs of Mid (XZ+2, S1S10)
Receiving
Frequency
Super (S11S20) & Hyper (S21S41) bands receivable
VIF Carrier
38.0MHz
Intermediate
Frequency
SIF Carrier
32.5MHz (5.5MHz) / 31.5MHz (6.5MHz) / 33.5MHz (4.5MHz)
Colour Sub Carrier Frequency
PAL : 4.43MHz
SECAM : 4.40625MHz / 4.25MHz
NTSC : 3.58MHz / 4.43MHz
Aerial Input Terminal
75 Unbalanced
Rated
AC120240V, 50 / 60Hz
Power Input
Voltage
Operation
AC90260V, 50 / 60Hz
Power Consumption
97W (Max.) / 67W (Avg.)
Picture Tube
Visible size : 51cm measured diagonally
High Voltage
26.5kV±1kV(at zero beam current)
Speaker
5cm×9 cm
Oval type×2
Audio Output
3W (monaural)
Video
1Vp-p, 75
Input
Audio
500mVrms (-4dBs), High impedance
Video
1Vp-p, 75
Output
Audio
500mVrms (-4dBs), Low impedance
Remote Control Unit
RM-C565 (Battery size : AA / R06 / UM-3×2)
Design & specifications are subject to change without notice.


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No.51900
AV-G2171
3
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 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 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.
5.
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).
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, screwheads, earphone jack, control shafts, etc.)
to be sure the product is safe to operate without danger of
electrical shock.
(1) 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.
(2) 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 1500
! 10W resistor paralleled by a 0.15"F
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.).
0.15F AC-TYPE
1500 ! 10W
GOOD EARTH GROUND
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
AC VOLTMETER
(HAVING 1000 !/V,
OR MORE SENSITIVITY)


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No. 51900
AV-G2171
4
FEATURES
" New chassis design enables use of an interactive on-screen control.
" Wide range voltage (90V260V) AC power input.
" With AUDIO / VIDEO INPUT & OUTPUT terminal.
" MUTING button can reduce the audio level to zero instantly.
" Functional remote control to operate TV set (for channel select, volume control, power ON/OFF, etc.) from a distance.
" I2C bus control utilizes single chip ICs for IF, V/C and VSM.
" By means of AUTO CH PRESET, the TV stations can be selected automatically and the TV channels can also be rearranged automatically.
!SYSTEM BLOCK DIAGRAM
TU/IF
KEY
REMOTE CONTROL
MEMORY
V/C
CLOCK
8MHz
ENA
DAT
CLK
LOCK
SCL
SDA
CPU
DATA 21
CLOCK 20
ENABLE 22
LOCK 17
SDA2 36
I2C SCL2 38
SDA1 37
TONE, IF, V/C
I2C SCL1 39
EEP ROM
TUNER
EXT I2C
CONTROL
CONNECTOR
SDA
SCL


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No. 51900
AV-G2171
5
FUNCTIONS
Front control
Rear terminal
Remote control unit (RM-C565)
VIDEO INPUT Terminal
AUDIO (L/R) INPUT Terminal
CHANNEL PRESET Button
CHANNEL / Button
VOLUME / Button
OFF TIMER IND.
POWER IND.
MAIN POWER SW Button
ANT Terminal
VIDEO-INPUT Terminal
VIDEO-OUTPUT Terminal
AUDIO INPUT Terminal
AUDIO OUTPUT Terminal
POWER SW key
SOUND SYSTEM key
COLOUR SYSTEM key
PICTURE MODE key
TV/VIDEO key
DISPLAY key
OFF TIMER key
CHANNEL / key
VOLUME / key
NUMBER(CH.) key
MENU(/ & /) key
-/-- key
CHANNEL SCAN key
MUTING key
1
2
3
4
5
6
7
8
1
2
3
5
4
2
3
10
12
11
14
9
1
4
5
6
7
8
13