WATSON FA3628T
Manual de Servicio

3 TUNER Either a PLL or a VST tuner is used as a tuner. UV1316 (VHF/UHF) is used as a PLL tuner. For only PALM/N, NTSC M applications UV 1336 is used as the PLL tuner. UV 1 3 1 5 (VHF/UHF) is used as a VST Tuner. Channel coverage of UV1316: OFF-AIR CHANNELS CABLE CHANNELS CHANNELS S01to S08 S09 to S38 S39 to S41 FREQUENCY RANGE (MHz) 69.25to154.25 161.25to439.25 447.25 to 463.25

BAND
Low Band Mid Band High Band

CHANNELS E2toC E5 to E12 E21 to E69

FREQUENCY RANGE (MHz) 48.25 to 82.25(1) 175.25to224.25 471.25 to 855.25 (2)

(1). Enough margin is available to tune down to 45.25 MHz. (2). Enough margin is available to tune up to 863.25 MHz. Noise Low band Mid band High band Typical 5dB 5dB 6dB Max. 9dB 9dB 9dB Gain All channels Gain Taper (of-air channels) Min. Typical Max. :38dB 44dB 52dB : 8dB

Channel Coverage UV1336:

BAND
Low Band Mid Band

CHANNELS 2toD E toPP QQQ to 69

FREQUENCY RANGE (MHz) 55.25to139.25 145.25to391.25 397.25to801.25

High Band

Noise is typically 6dB for all channels. Gain is minimum 38dB and maximum 50dB for all channels. Channel Coverage of UV1315: OFF-AIR CHANNELS CABLE CHANNELS CHANNELS S01to S08 S11 to S39 S40 to S41 FREQUENCY RANGE (MHz) 69.25 to 168.25 231.25to447.25 455.25 to 463.25

BAND Low Band Mid Band High Band

CHANNELS E2toC E5 to E12 E21 to E69

FREQUENCY RANGE (MHz) 48.25 to 82.25(1) 175.25to224.25 471.25 to 855.25 (2)

(1). Enough margin is available to tune down to 45.25 MHz. (2). Enough margin is available to tune up to 863.25 MHz. Noise Low band Mid band High band Typ. 6dB 6dB 6dB Max. 9dB 10dB 11dB Gain All Channels Gain Taper (off-air channels) Min. 38dB Typ. 44dB Max. 50dB 8dB

4 SOUND OUTPUT STAGE TDA2822 TDA2822 is used as the AF output amplifier. It is supplied by +12VDC coming from a separate winding in the SMPS transformer. An output power of 3W(THD=10%) can be delivered into an 16 ohm load. 5 VERTICAL OUTPUT STAGE WITH TDA8174A TheTDA8174Aisa power amplifier circuit for use in 90° and 1 1 0 ° colour deflection systems for 25 to 200 Hz field frequencies, and for 4 : 3 and 1 6 : 9 picture tubes. 6 POWER SUPPLY (SMPS) The DC voltages required at various parts of the chassis are provided by an SMPS transformer controlled by the 1C UC3842/ 3 which is designed for driving, controlling and protecting switching transistor of SMPS. The transformer produces 1 1 5 V for FBT input, ±12V for audio output 1C, S+5V and 8V for ST92195. 7 DISCRETE VIDEO AMPLIFIER Three high voltage, high frequency transistor is used for RGB amplifier. This application works on fixed AC and DC gains.