SHARP AK-44 CHASSIS
Manual de Servicio

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

Channel Coverage UV1336
BAND Low Band Mid Band High Band CHANNELS 2 to D E to PP QQ to 69 FREQUENCY RANGE (MHz) 55.25 to 139.25 145.25 to 391.25 397.25 to 801.25

Noise is typically 6 dB for all channels. Gain is minimum 38 dB and maximum 50 dB for all channels.

Channel Coverage of UV1315
BAND Low Band Mid Band High Band OFF-AIR CHANNELS FREQUENCY CHANNELS RANGE (MHz) E2 to C 48.25 to 82.25 (1) E5 to E12 175.25 to 224.25 E21 to E69 471.25 to 855.25 (2) CABLE CHANNELS FREQUENCY CHANNELS RANGE (MHz) S01 to S10 69.25 to 168.25 S11 to S39 231.25 to 447.25 S40 to S41 455.25 to 463.25

(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. Max. 6 dB 9 dB 6 dB 10 dB 6 dB 11 dB Gain Min. All Channels 38 dB Gain Taper (off-air channels) Typ. 44 dB Max. 50 dB 8 dB

4. DIGITAL TV SOUND PROCESSOR MSP34X0
The MSP 34x0G is designed to perform demodulation of FM or AM-Mono TV sound. Alternatively, two-carrier FM systems according to the German or Korean terrestrial specs or the satellite specs can be processed with the MSP 34x0G. Only the MSP 3410 does digital demodulation and decoding of NICAM-coded TV stereo sound. The MSP 34x0G offers a powerful feature to calculate the carrier field strength which can be used for automatic standard detection (terrestrial) and search algorithms (satellite).

5. SOUND OUTPUT STAGE TDA7266L/TDA7266
TDA7266L is used as the AF output amplifier for mono applications. It is supplied by +12 VDC coming from a separate winding in the SMPS transformer. An output power of 4 W (THD = 0.5 %) can be delivered into an 16 ohm load. TDA7266 is used as the AF output amplifier for stereo applications. It is supplied by +12 VDC coming from a separate winding in the SMPS transformer. An output power of 2*4W (THD = 0.5 %) can be delivered into an 16 ohm load.

6. VERTICAL OUTPUT STAGE WITH TDA8174A
The TDA8174A is a power amplifier circuit for use in 90° and 110° color deflection systems for 25 to 200 Hz field frequencies, and for 4 : 3 and 16 : 9 picture tubes. IC403 generates a vertical pulse signal VER_OUT and V_AMP that are fed to IC600 (the vertical stage IC). IC600 is supplied by a 26V DC via diode D610. It generates its own ramp signal and based on the V_AMP & VER_OUT signals it produces the vertical deflection signals that are fed to connector PL601. Vertical linearity adjustment is controlled by Q604, which is driven by the PWM output of IC501 at pin 49. Vertical position adjustment is conducted by Q606 derived by the VER_OUT signal. Switching Q606 will change the DC voltage on VOUT_2 pin, which will either lower or higher the picture. A DC level is supplied at VOUT_2 via D614 to stabilise the picture and make its position changeable.

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