BEKO BEKO chassis-E1 free download

File name BEKO chassis-E1.pdf

CONTENTS PAGE o Safety Instructions 2 o Technical Specifications 3 o Remote Control 4 o Preperations 5 o Operating Your TV 6 o Block Diagram 10 o IC Specs 11 o Pin Voltages of IC's 18 o OSCILLOSGRAPHS OF SOME IC PINS 19 o Electrical Adjustments 22 o Channel Frequency Tables 25 o Spare Part List 27 1 1. SAFETY INSTRUCTIONS . GENERAL GUIDELINES the receiver, such as screw heads, aerials, 1. It is advised to insert an isolation transformer connectors, control shafts etc. When the in the AC supply before servicing a hot exposed metallic part a return path to the chassis. chassis the reading should be between 4Mohm and the 20Mohm. When the exposed 2. Potentials as high as 33KV are present when metal does not have a return path to the this receiver is in operation. Operation of the chassis, the reading must be infinite. receiver without the rear cover involves the danger of a shock hazard from the receiver LEAKAGE CURRENT HOT CHECK power supply. Servicing should not be 1. Plug the AC cord directly in to the AC outlet. attempted by any one who is not competent Do not use an isolation transformer for this with the precautions necessary when working check. on the high voltage equipment. Always 2. Connect a 2Kohm 10W resistor in series with discharge the anode of the tube. an exposed metallic part on the receiver and an earth, such as a water pipe. 3. When servicing observe the original lead 3. Use an AC voltmeter with high impedance to dress in the high voltage circuits. If a short measure the potential across the resistor. circuit is found, replace all the parts which 4. Check each exposed metallic part and have been overheated or damaged by the check the voltage at the each point. short circuit. 5. Reverse the AC plug at the outlet and repeat each of the above measurements. 4. Always use the manufacturer's replacement 6. T