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File name 12.8 circuit diagram CRT with transistors.pdf

155V CRT MODUL (VERSION 02) 155V R710 15k T701 BF422 R702 220R C701 47p R711 390R crt 8V_ R713 2.7k C702 10u/250V D701 1N4007 crt R709 220R D702 1N4148 R725 C705 R712 100R crt 1k 470p T702 BF421 G2 R714 1.5K GREEN n.c. 5 G1 10 6 9 7 8 HT RED HT 4 12 11 BLUE X703 GND GND CRT SOKET * C703 Table R707 220R X701 RGB 1 2 3 4 5 6 crt R706 220R R703 220R C706 R715 15k 155V D703 1N4148 R726 1.5K R719 1k T704 BF421 AQUA R717 100R crt SMPS C712 2.2n G2 8V_ T703 BF422 R718 2.7k C708 470p 8V_ 47p R716 390R * C707 Table crt 155V R720 15k R704 220R T705 C709 47p R721 390R BF422 C710 Table R722 100R crt R701 100R crt 8V_ R723 2.7k D704 1N4148 R727 1.5K R724 1k 155V T706 BF421 R728 100K 1/2W crt C713 100n/250V 3 1 2 X702 CRT C711 470p * crt

File name 12.8 Service Manual.pdf

CONTENTS PAGE Safety Instructions 1 Technical Specifications 2 Pin Voltages of IC's 3 Waveforms 7 Electrical and Service Adjustments 11 Spare Parts List 14 Circuit Diagrams Attached SAFETY INSTRUCTIONS GENERAL GUIDELINES 1. It is advised to insert an isolation transformer in the AC supply before servicing a hot chassis. 2. Potentials as high as 33KV are present when this receiver is in operation. Operation of the receiver without the rear cover involves the danger of a shock hazard from the receiver power supply. Servicing should not be attempted by any one who is not competent with the precautions necessary when working on the high voltage equipment. Always discharge the anode of the tube. 3. When servicing observe the original lead dress in the high voltage circuits. If a short circuit is found, replace all the parts which have been overheated or damaged by the short circuit. 4. Always use the manufacturer's replacement safety components. The critical safety components marked with on the schematics diagrams should not be replaced by other substitutes. Other substitute may create the electrical shock, fire or other hazards. Take attention to replace the spacers with the originals. Furthermore where a short circuit has occurred, replace those components that indicate evidence of overheating. 5. After servicing, see that all the protective devices such as insulation barriers, insulation papers, shields and isolation R-C combinations are correctly installed. 6. When the receiver is not being used for a long time of period of time, unplug the power cord from the AC outlet. 7. After servicing make the following leakage current checks to prevent the customer from being exposed to shock hazard. LEAKAGE CURRENT COLD CHECK 1. Unplug the AC cord and connect a jumper between the two prongs of the plug. 2. Turn the receiver's power switch on. 3. Measure the resistance value with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on the receiver, such as screw heads, aerials, connectors, control shafts etc. When the exposed metallic part a return path to the chassis the reading should be between 4Mohm and the 20Mohm. When the exposed metal does not have a return path to the chassis, the reading must be infinite. LEAKAGE CURRENT HOT CHECK 1. Plug the AC cord directly in to the AC outlet. Do not use an isolation transformer for this check. 2. Connect a 2Kohm 10W resistor in series with an exposed metallic part on the receiver and an earth, such as a water pipe. 3. Use an AC voltmeter with high impedance to measure the potential across the resistor. 4. Check each exposed metallic part and check the voltage at the each point. 5. Reverse the AC plug at the outlet and repeat each of the above measurements. 6. The potential at the any point should not exceed 1.4 Vrms. In case a measurement is outside the limits specified, there is the possibility of a shock hazard, and the receiver should be repaired and rechecked before it is retur

File name 12.8.txt

SDA5552 24C04 STV2246 AUDIO TDA2822 CRT DRIVE TDA6107 H.O.STX112 BU808DFI V.O.TDA8174AW POWER TDA16846 K2545

File name BEKO 12.8.pdf