Sharp LC-32D12E Service Manual ▷ View online
1.1.
General Block Diagram
1.2.
MB61 Placement of Blocks
1. 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.
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.
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
high.
microcontroller. If ANT_CTRL is low, ANT_PWR will be low. If ANT_CTRL is high, ANT_PWR will be
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.
ANT_CTRL will be low, so ANT_PWR will be low. Finally, short circuit protection is done by circuits
and microcontroller.
1.1. General description of Samsung DTOS403LH121B:
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.
CCIR CH). Band selection and Tuning are performed digitally via the I2C bus.
1.2. Features of DTOS403LH121B:
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
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 )
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 )
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
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
1.3. Pinning:
Pin no.
Terminal
Name
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 BroadBand
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