bush 1433 free download

File name Bush_1433.pdf

BUSH 1433 General Information Also Covers Bush 1434, 1435, 1473 T, 1474 T, 1435 GTV Alba CTV 3409, CTV 3459 Goodmans GTV 3409, GTV 3459 11 AK08 & 11AK20 Chassis Safety Notes DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCH OFF. The mains supply side of the switch mode power supply transformer is live. Use an isolating transformer. The receivers fulfill completely the sfety requirements. Safety precautions Servicing of this TV should only be carried out by a qualified person. · Components marked with the warning symbol on the circuit diagram are critical for safety and must only be replaced with an identical component. · Power resistor and fusable resistors must be mounted in an identical manner to the original component. · When servicing this TV, check that the EHT does not exceed 26 KV. TV set switched off: Make short-circuit between HV-CRT clip and CRT ground layer. Short 0808 (150µF) before changing IC801 or other components in primary side of SMPS. Measurements Voltage readings and oscilloscope traces are measured under following conditions. Antenna Signal 60 dBuV from colorbar generator. (100% white, 75% color saturation) Brightness, contrast, color set for a normal picture. Mains supply, 220V AC, 50 Hz. The adjustments should be carried out in the following order for convenience. SMPS SYSTEM VOLTAGE 1) Set the BCS (Brightness, Contrast, Saturation) and VOL (Volume) to minimum. 2) Check the voltage at the shorted pins of socket PL602 (TP1) 3) If necessary, adjust VR801 112 ± 0.5VDC (14" and 15 models) 4) Set the BCS and VOL to normal picture and sound VISION DEMODULATOR AND AFC 1) Set the pattern generator for 10mV, 38.9 MHz (B/G models) or 39.5 MHz (for I models) or 38.0 MHz (for 0/K models) RF output 2) Connect the RF output of the pattern generator to any one input of SAW filter and connect the other input of SAW filter to ground through 10 nF capacitor (No antenna input applied) 3) Check the voltage at the base of 0201 (TP2) 4) Adjust VL401 for 3.5 ± 0.1 Voc 2) PICTURE GEOMETRY AND FOCUS 1) Set the pattern generator for centre-cross, circle and cross-hatch composite pattern. 2) Adjust VR702 for vertical size, VR701 for vertical linearity, VR401 for horizontal centering and focus potentiometer (on EHT transformer) for optimum focusing. TUNER AGC 1) Check the voltage at pin lof TUNER (TP4) 2) Adjust VR402 for 1V less than maximum. SCREEN VOLTAGE 1) Set the pattern generator for grey scale. 2) Set the BCS (Brightness, Contrast, Saturation) to minumum. 3) Measure cathode voltages on the CRT base board by using a 1/1000 probe. 4) Adjust screen pot of FBT for 175 ± 2V reading on maximum cathode voltage. CRT BASEBOARD:CUT-OFF VOLTAGES AND WHITE BALANCE 1) Set the pattern generator for grey scale. 2) Set the BCS (Brightness, Contrast, Saturation) to minumum. SECAM L MODULE (L/L' AND B/G) OR (L/L' AND K1) (11SL02) 1) Set the pattern generator for the colour bar pattern at system PAL B/G and at frequency of 63.75MHz. 2) Tune the receiver for the