Sharp LC-24DV510K (serv.man2) Service Manual ▷ View online
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CIRCUIT DESCRIPTIONS
2. TUNER(TU102)
A horizontal mounted and Digital Half-NIM tuner is used in the product, which covers 3 Bands(From 48MHz
to 862MHz for COFDM, from 45.25MHz to 863.25MHz for CCIR CH). The tuning is available through the
digitally controlled I2C bus (PLL). Below you will find info about the tuner.
to 862MHz for COFDM, from 45.25MHz to 863.25MHz for CCIR CH). The tuning is available through the
digitally controlled I2C bus (PLL). Below you will find info about the tuner.
In active antenna option, the following circuit are used. ANT_CTRL pin is controlled by microcontroller. If
ANT_CTRL is low, ANT_PWR will be low. If ANT_CTRL is high, ANT_PWR will be logic high.
ANT_CTRL is low, ANT_PWR will be low. If ANT_CTRL is high, ANT_PWR will be logic high.
OVER_CUR_DETECT pin is a monitor for short circuit in antenna. OVER_CUR_DETECT is low,
ANT_CTRL will be low, so ANT_PWR will be low. Finally, short circuit protection is done by circuits and
microcontroller.
microcontroller.
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2.1.General description of Samsung DTOS403LH122X:
The Tuner covers 3 Bands(from 48MHz to 862MHz for COFDM, from 45.25MHz to 863.25MHz for CCIR
CH). Band selection and Tuning are performed digitally via the I2C bus.
2.2.Features of DTOS403LH122X:
Receiving System: This TUNER is designed to cover the air channels in VHF and UHF, compliant
with DVB-T standard. and It covers all Analog channels from 48.25MHz to 863.25MHz
Receiving Channel (Digital, Center frequency):
VHF Low CH. E2 ~ S10 ( 50.5MHz ~ 170.5MHz )
VHF High CH. E5 ~ S41 ( 177.5MHz ~ 466 MHz )
UHF CH. E21 ~ E69 ( 474 MHz ~ 858 MHz )
Receiving Channel (PAL, Picture carrier frequency):
VHF Low CH. E2 ~ S10 ( 48.25MHz ~ 168.25MHz )
VHF High CH. E5 ~ S41 ( 175.25MHz ~ 463.25MHz )
UHF CH. E21 ~ E70 ( 471.25MHz ~ 863.25MHz )
Intermediate Frequency:
Digital(center) DVB-T (36.167 MHz)
Digital(center) DVB-C (36.125 MHz)
Analog(picture) 38.9 MHz
Input Impedance
: 75Ω, Unbalanced
Band Change-Over System
: PLL Control System
Tuning System
: Electronic Tuning System With PLL
Internal(or External) RF AGC function :Built in wideband AGC detector with 6 programmable take-
over points
over points
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2.3.Pinning:
Pin no.
Terminal Name
Pin Description
1
Ant Power
Active Antenna Power
2
B+
+5V, Supply Voltage (Preamplifier, DC/DC)
3
RF AGC
RF AGC (internal or external mode)
4
CL
I2C Serial Clock
5
DA
I2C Serial Clock
6
BP
+5V, Supply Voltage (RF Amp, PLL, IF Amp)
7
BT(T.P)
+33V, within DC/DC circuit
8
AS
I2C Address Selection of the PLL
9
IF AGC
Control voltage for the IF AGC
10
IF OUT +
Output 2 of the IF Amplifier
11
IF OUT -
Output 1 of the IF Amplifier
12
AIF Output
IF output of the Analog Broad-Band
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3. SAW FILTER – Audio – Epcos K9656M(Z101)
3.1.Standard
B/G
D/K
I
L/L’
3.2.Features
TV IF audio filter with two channels
Channel 1 (L’) with one pass band for sound carriers at 40,40 MHz (L’) and 39,75 MHz (L’-
NICAM)
Channel 2 (B/G,D/K,L,I) with one pass band for sound carriers between 32,35 MHz and
33,40 MHz
3.3.Pin configuration
1 Input
2 Switching input
3 Chip carrier - ground
4 Output
5 Output
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