Service Manual - E1 Chassis - Safety Instructions - Technical Specifications - Remote Control

Oct 12, 2026

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Service manual for the E1 chassis, providing safety instructions, technical specifications, and remote control operation. Includes guidance for servicing a hot chassis, high-voltage precautions up to 33KV, X-ray radiation warning, and leakage current cold/hot checks with resistor/ohmmeter measurement procedures. Lists power supply, standby power, receiving systems and channels, audio and high-voltage audio parameters, focus/grid/heater voltages, video/audio terminal types, operating temperature, and applicable safety standards. Also details remote button functions and teletext features such as fastext, update, mix, and sub-page.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages34

Reading Time1 h 26 min

AccessFree to download

Contents Page

Safety Instructions

Technical Specifications

Remote Control

Preperations

Operating Your TV

Block Diagram

IC Specs

Pin Voltages of IC’s

OSCILLOGRAPHS OF SOME IC PINS

Electrical Adjustments

Channel Frequency Tables

Spare Part List

Service Manual E1 CHASSIS 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. SAFETY INSTRUCTIONS . GENERAL GUIDELINES 1. It is advised to insert an isolation transformerin 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 leaddress 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 thespacers 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 along 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 returned to the customer. Figure 1 X-RAY RADIATION WARNING The primary source of X-ray radiation in this receiver is the picture tube. The chassis is specially constructed to limit X-ray radiation. For continued Xray radiation protection, replace the tube with the same type of the original one. CAUTION AFTER REMOVAL OF THE ANODE CAP, DISCHARGE THE ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR THE CARBON PAINTED ON THE CRT WITH A HIGH VOLTAGE PROBE AND MULTIMETER (SELECT VDC) AND THEN SHORT CIRCUIT DIRECTLY TO DISCHARGE COMPLETELY 2. TECHNICAL SPECIFICATIONS . Power source: 220-240V AC, 50-60Hz Power consumption (nom.) : 40 W 14” 50 W 20”, 21” Standby power consumption : 4 W Aerial impedance : 75Ohm, coaxial type

FAQs

What precautions are required before servicing the E1 chassis?

Insert an isolation transformer for servicing a hot chassis and discharge the anode of the tube. Observe original lead dress in high-voltage circuits and only attempt service if competent with high-voltage precautions.

How is leakage current measured during the cold check?

Unplug the AC cord, jumper the plug prongs, power on, then measure resistance between the jumpered plug and each exposed metallic cabinet part. Readings should be between 4 Mohm and 20 Mohm when a return path exists, and infinite when no return path exists.

What are the key remote control functions and special features listed?

The remote includes buttons for mute, ten key program entry, menu, program up/down, volume control, standby, AV/TV selection, OK, picture format (16:9), sleep timer, and teletext functions. Special features include automatic programming, 100 programme memory, cable channel availability, manual fine tuning, SWAP channel return, and a 16:9 picture format.

Oct 12, 2026

Upload by Terk