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ENGLISH
72
OPERATING PRINCIPLES OF THE CIRCUIT COMPONENTS
IC900 Analog-digital tuner inte-
grated circuit
(IC-SMD Si2151-A10-
GMR)
IC900 Analog-digital tuner IC has two different
blocks. It communicates with Main IC using I2C
protocol. Thus, it locks into two set channels.
Tuner 1 block in IC is used for analog broadcast
and CVBS mark is sent to Main IC by demodu-
lation. Both tuner blocks can be used for digital
broadcasts. IF signal of desired channel is sent
to demodulator IC. IC900 integrated circuit is
supplied by 3.3V_TUN.
IC902 Satellite tuner integrated
circuit
(IC-SMD AV2018-S85QFG)
IC902 satellite tuner IC obtains inter frequency
signal of digital broadcast, similar to the tuner
in our chassis; filters this carrier frequency from
other frequencies and sends video and audio
data on it to the demodulator after loading IF on
inter-frequency. This DVB-S2 compatible tuner
also enables viewing HD broadcast from the
satellite. It operates with 3.3 V supply. And its
outputs are directly sent to the demodulator.
IC903 LNB regulator
This integrated circuit adjusts LNB voltage ac-
cording to the data received from IC through
I2C line. High band-low band, vertical-horizon-
tal selection, DiSEqC selection are all done ac-
cording to the data this integrated circuit sends
to LNB. It is supplied 12 V power.
IC800, IC801 USB supply inte-
grated circuit
(IC-SMD TPS2530D-
BVR, IC-SMD TPS2065CDBVR-2)
It is the integrated circuit that switches USB volt-
age and limits USB current. Data lines in USB
socket are directly connected to main integrated
circuit.
Содержание COREMAX M1 PROJECT GM
Страница 1: ...COREMAX M1 PROJECT GM CHASSIS SERVICE MANUAL...
Страница 66: ...ENGLISH 66 GENERAL OPERATING PRINCIPLE OF THE TV Block Diagram...
Страница 81: ...ENGLISH 81 CHASSIS DIAGRAMMATIC IMAGES Chassis DC Socket DC voltages...
Страница 82: ...ENGLISH 82 CHASSIS DIAGRAMMATIC IMAGES...
Страница 83: ...ENGLISH 83 CHASSIS DIAGRAMMATIC IMAGES Terrestrial tuner Satellite tuner...
Страница 84: ...ENGLISH 84 CHASSIS DIAGRAMMATIC IMAGES USB...
Страница 86: ...ENGLISH 86 FAILURE ERROR ANALYSES...
Страница 88: ...ENGLISH 88 FAILURE ERROR ANALYSES...
Страница 90: ...ENGLISH 90 FAILURE ERROR ANALYSES...