Durabrand HPS-2971 Manuale utente
Service Manual
Model HPS-2971
Customer: Wal Mart
CODE: 1.01.72420.57
___________________________
Approved Signature
HPS-2971
INDEX
1. PRODUCT SPECIFICATION
2. PACKAGING BOX
3. TECHNICAL SPECIFICATION
4. CALIBRATION SCRIPT
5. MATERIAL LIST
6. ELECTRICAL SCHEME
6.1 MAIN AND REMOTE CONTROL PCB
7. SILKTOP AND SOLDERS
7.1 MAIN PCB
7.3 REMOTE CONTROL PCB
8. EXPLODED VIEW
9. BLOCK DIAGRAM
HPS-2971
Esc. 1/4
Fl. 2/4
GABINETE FRONTAL
mec. 1.57.72420.08
inj. 1.57.72420.09
acab. 1.57.72420.07
TECLA POWER
mec. 1.67.72420.02
inj. 1.67.72420.07
acab. 1.67.72420.08
TECLADO DE FUNÇÕES
mec. 1.77.72420.02
inj. 1.67.72420.09
acab. 1.67.72420.10
LENTE LED/SENSOR
mec. 1.67.72420.01
STEREO
SAPSAP
impressão
PRETO
1.87.33670.00
impressão
PRETO
1.87.33670.00
pintura
PRATA 3D TEXTURIZADO
1.87.33801.11
pintura
PRATA 3D TEXTURIZADO
1.87.33801.11
tecla power
teclado de funções
ABS ALTA FLUIDEZ CZ CLARO
gabinete frontal=
1.86.90200.90 (ABS R PR)
1.86.02063.99 (HI PS 478 DOW)
1.86.96123.08 (PIG CZ MÉDIO)
alternativo
POWER - CANAL + - VOLUME +
STANDBY
REMOTE
VIDEO
IN 2 L
AUDIOR
(MONO)
IN 2
ON•OFF
MENU
logotipo Durabrand
1.67.72342.01
Esc. 1/4
Fl. 3/4
ETQ. DE IDENTIFICAÇÃO
acab. 1.06.72420.12
GABINETE TRASEIRO
mec. 1.57.72466.01
inj. 1.57.72466.02
gabinete traseiro=
1.86.90216.00
(PS Hi V0 PRETO)
CONHEÇA A AMAZÔNIACONHEÇA A AMAZÔNIA
ATENCIÓNATENCIÓN
CAUTIONCAUTION
NO ABRA, RIESGO DE CHOQUE ELÉCTRICO.NO ABRA, RIESGO DE CHOQUE ELÉCTRICO.
RISK OF ELECTRIC SHOCK. DO NOT OPEN.RISK OF ELECTRIC SHOCK. DO NOT OPEN.
AV 1SUB
S-VIDEO
IN AV 1
OUT IN
V
A
R
UHF/VHF
ANT
75 (MONO)
L
V
Pb
Pr
(OUT)
Y
COMPONENT
VIDEO IN R
L
ETIQUETA IDENTIFICAÇÃO
HPS-2971
P.SKIPP.SKIP
P.CHANNELP.CHANNEL
MENUMENU
AVAV
DSCDSC
CCCC
AUTO IMAGEAUTO IMAGE
ON/OFFON/OFF
MUTEMUTE
SLEEPSLEEP
11
44
77
22
55
88
00
33
66
99
CH+CH+
VOL+VOL+VOL-VOL-
CH-CH-
RC-201RC-201
OSD/OUTOSD/OUT
ST/SAPST/SAP
RC-201
Esc. 1/1
gabinete superior,
gabinete inferior e
tampa p/ pilhas =
1.86.90011.08 (ABS a.f. CZ)
1.86.90020.08 (ABS a.f. CZ PH) opcional
Impressão preto
1.87.33670.00
TECLADO BORRACHA
acab. 1.77.72357.02 (import.)
GABINETE SUP. CR
mec. 1.57.72254.05
inj. 1.57.72357.05
acab. 1.57.72357.06
GABINETE INF. CR
mec. 1.57.52181.04
acab. 1.57.72254.08
TAMPA PORTA PILHAS
mec. 1.57.52181.05
acab. 1.57.72254.09
(1.02.72357.90)
HPS-2971
3. TECHINICAL SPECIFICATION
Procedure to check up color TV electrical parameters
3.1 Audio
3.1.1 Output power at 10% THD
Connection through external video and audio input
a) TV setup in “PP” condition.
b)Connect a color bar generator (PAL-M system) to video input.
c) Connect an audio generator with 500mVAC level and 400Hz sinusoidal
frequency to audio input.
d)Connect to the power amplifier output a resistive load with equivalent Ohm
value of speaker used on the tested TV.
e) Connect a AC Voltmeter/Distortion Meter to the resistive load and increase
volume control until Distortion Meter reading be 10%. Measure voltage on
the resistive load and calculate power through next equation:
P=(V²/R)
Where “V” is voltage in VOLTS, “R” is resistive load in OHMS and “P” is
power in WATTS.
Mínimum Nominal Maximum Unit
4,50 5,00 -W
3.1.2 Residual Audio
a) TV setup in “PP” condition.
b)Apply 60dBµV signal (frequency and channel factory defined) to antenna
input modulated with white pattern at 87,5% and audio signal with 400Hz
frequency modulated in FM with 25kHz deviation.
c) Connect an oscilloscope to power amplifier output (connect for the
speaker).
d)Adjust volume to minimum.
e) Use the oscilloscope to measure peak-to-peak voltage, in Volt peak-to-peak
(Vpp).
Minimum Nominal Maximum Unit
- - 500 mVpp
HPS-2971
3.1.3 Audio frequency response in TV’s without tone control
a) TV adjustment condition:
üBalance center
üBass center
üTreble center
b)Connect a color bar generator (PAL-M system) to video-in.
c) Connect to the audio input TV - an audio generator adjust to 500 mVac
level, and sine wave 1kHz.
d)Connect to the output power amplifier a resistive load with the same value
of the impedance speaker.
e) Connect na AC voltmeter over the resistive load and adjust volume control
until obtain 1 Vac ).
f) Realign the audio generator to 100 Hz sine wave at the same level ( 500
mVac).
g)Read the new voltage in the resistive load and calculate the change in dB
through next equation:
A(100Hz)=20 log (VL/VREF)
The result is defined in“Decibel units “
h)Readjust the audio generator frequency to 10 kHz at the same level.
i) Read the new voltage Vh at the resistive load and calculate the change in
dB through the next equation:
A(10kHz)=20logVH/VREF
Condition Minimum Nominal Maximum Unit
100Hz -4,00 0,00 +2,00 dB
10kHz -5,00 -1,00 +3,00 dB
3.1.4 Áudio frequency response for the stereo television set with tonality
control
a) Repeat the above procedures (item 3) for the following additional
conditions:
Condition Minimum Nominal Maximum Unit
Bass control in max. position 100Hz +6,00 +10,00 +15,00 dB
Treble control in the meddle. 10kHz -5,00 +1,00 +3,00 dB
Bass control in the min position. 100Hz -15,00 -10,00 -7,00 dB
Treble control in the meddle. 10kHz -5,00 +1,00 +3,00 dB
Bass contr. in the meddle post.. 100Hz -4,00 0,00 +2,00 dB
Treble control int the min pos.. 10kHz -15,00 -10,00 -7,00 dB
Bass contr. in the meddle pos. 100Hz -4,00 0,00 +2,00 dB
Treble contr in the max. pos.. 10kHz +5,00 +10,00 +15,00 dB
HPS-2971
3.1.5 Channel separation in Stereo reception for the stereo television set
a) TV setup in PP condition.
b)Apply a 60dBmV signal (frequency and channel factory defined) with 88%
video modulation and audio stereo carrier modulation within the standard
“MTS” (BTSC).
c) Connect an AC double voltmeter at the audio output L-R.
d)Adjust the volume control to max. and the tremble, bass and balance to
middle position.
Note:
üDisconnect the speakers for more comfortable work.
e) Adjust the stereo generator for left channel only – with 30% modulation of
300 Hz sine wave and 7.5 kHz deviation.
f) Read the Double Voltammeter value Vac corresponding of Left and Right
channel and calculate the stereo separation trough the equate:
Sep (300Hz) L→R=20 log (VL/VR)
g)Adjust the stereo generator for left channel only – with 30% modulation of
3kHz sine wave and 7.5 kHz deviation.
Sep (3kHz) L→R=20 log (VL/VR)
i) Repeat the procedures e, f and g, and now select Right channel only, at the
same conditions above mentioned.
Sep(300Hz) R→L=20 log (VR/VL)
Sep(3kHz) R→L=20 log (VR/VL)
Condition Minimum Nominal Maximum Unit
Sep(300Hz) L →R12,00 - - dB
Sep(3kHz) L→R12,00 - - dB
Sep(300Hz) R→L12,00 - - dB
Sep(3kHz) R→L12,00 - - dB
3.1.6 Output and distortion level of S.A.P. signal
a) TV setup in PP condition.
b)Apply a 60dBµV signal ( Frequency and channel factory defined ) with 88%
video modulation, and Stereo / S.A.P audio signal carrier in accordance of
standard “MTS” (BTSC).
c) Connect na AC volt-distortion-meter at the Left channel.
d)Adjust the volume control to max. and the tremble, bass and balance to
middle position.
Note:
üDisconnect the speakers for more comfortable work.
e) Adjust the Stereo/SAP generator for 400 Hz sine wave and 100%
modulation.
HPS-2971
f) Active the SAP function in the Test Television.
g)Read Vac at the AC volt-distortion-meter.
h)Repeat all above procedures, connecting the volt-distortion-meter at the
Right channel
Minimum Nominal Maximum Unit
Output Level 450,00 500,00 550,00 mVAC
Distortion (THD) 0,20 1,00 1,50 %
3.1.7 AM Rejection
a) Connect at the IF sound input a FM generator adjust to 4.5 MHz modulated
with 400 Hz sine wave and +/- 25 kHz deviation and 90 dBuV level.
b)Connect na AC voltmeter in the audio detector output (after the emphasis
circuit) and read the VFM tension.
c) Connect at the IF sound input a AM generator pre-adjust to 4.5 MHz 30%
modulated with 400 Hz sine wave, and 90 dBuV level.
d)Read the Vam value in the voltmeter.
AMrejection will now be calculated by the equation:
RejAM = 20 log(VFM/VAM)
Note:
üBecause this parameter is designed to define only the
one circuit TV perform, the startup conditions adjust and
what’s circuits will be supplied, it will be defined
separately for each one model.
Minimum Nominal Maximum Unit
30,00 40,00 60,00 dB
3.2 POWER SUPPLY
3.2.1 Consumption
Consume
a) Connect the TV under test through a electronic wattmeter at the
220Vac/60Hz line.
b)Turn-on the TV set and apply a 60dBµV ( the preferred channel must to be
defined by the production unit), modulated with a 88% video signal white
pattern, and a±25 kHz deviation FM carrier with a 400Hz sine wave audio
signal.
c) Adjust for max. the bright, contrast and volume controls, and read the Sink
Power show at the wattmeter.
d) Active Standby mode and read again the Sink power.
e) Repeat all below procedures, connecting now the television under test to a
110Vac/60 Hz line.
Condition Minimum Nominal Maximum Unit
Indice
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