LA76931 – Color TV Receiver

Part Number : LA76931

Function : Color TV Receiver

Manufactures : ETC

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Description :

SERVICE MANUAL Color Television Receiver Model: -SZ2(MONO) series 1 SPECIFICATION System TV AV PAL D/K , B/G , I NTSC 4.43/3.58MHz 49.75~85.25 MHz 168.25~216.25MHz 471.25~863.25 MHz 112.25~464.25MHz Channel VHF LOW VHF HIGH UHF CATV Scanning Line 625 Line Horizontal Frequency 15625Hz Vertical 50/60 Hz Video Sound Chroma 38MHz 31.5/32/32.5 MHz 33.57 MHz IF Frequency Sensitivity VHF LOW 43 dBμV VHF HIGH 45 dBμV UHF 45 dBμV CATV 45 dBμV 7% THD 75Ω 60W (14″ series) 75W (21″ series) AC 110/220/240V 50/60Hz 2W + 2W Audio Output Power Antenna Impedance Power Consumption Power Supply 2 IMPORTANT SERVICE SAFETY INFORMATION Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these models should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment. Exercise care when servicing this chassis with power applied. Many B plus and high voltage RF terminals are exposed which, if carelessly contacted, can cause serious shock or result in damage to the chassis. Maintain interconnecting ground lead connections between chassis, escutcheon, picture tube dag and tuner when operating chassis. These receivers have a “polarized” AC line cord. The AC plug is designed to fit into standard AC outlets in one direction only. The wide blade connects to the ‘ground side’ and the narrow blade connects to the ‘hot side’ of the AC line. This assures that the TV receiver is properly grounded to the house wiring. If an extension cord must be used, make sure it is of the ‘polarized’ type. Since the chassis of this receive is connected to one side of the AC supply during operation, service should not be attempted by anyone not familiar with the precautions necessary when working on these types of equipment. When it is necessary to make measurements or tests with AC power applied to the receiver chassis, an Isolation Transformer must be used as a safety precaution and to prevent possible damage to transistors. The Isolation Transformer should be connected between the TV line cord plug and the AC power outlet. Certain HV failures can increase X-ray radiation. Receivers should not be operated with HV levels exceeding the specified rating for their chassis type. The maximum operating HV specified for the chassis used in these receivers is 23.5kV±1.0kV at zero beam current with a liner voltage of 120V AC. Higher voltage may also increase the possibility of failure in the HV supply. It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the received that could cause a rise in high voltage, or operating supply voltages. No changes should be made to the original design of the receiver. Components shown in the shaded areas on the schematic diagram and/or identified by in the replacement parts list should be r […]

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LA76931 Datasheet


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