Service Manual E1 CHASSIS CONTENTS o o o o o o o o o o o o Safety Instructions Technical Specifications Remote Control Preperations Operating Your TV Block Diagram IC Specs Pin Voltages of IC's OSCILLOSGRAPHS OF SOME IC PINS Electrical Adjustments Channel Frequency Tables Spare Part List PAGE 2 3 4 5 6 10 11 18 19 22 25 27 1 1. 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 on the components marked with 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 returned to the customer. HOT CHECK CIRCUIT AC-Voltmeter TO INSTRUMENTS EXPOSED METALLIC PARTS Water pipe (earth) 2 K Ohm 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 2 AND MULTIMETER (SELECT VDC) AND THEN SHORT 2. TECHNICAL SPECIFICATIONS Power source: Power consumption (nom.) : Standby power consumption : Aerial impedance : Receiving system 1: 220-240V AC, 50-60Hz 40 W 50 W 4W 75Ohm, coaxial type PAL BG PAL SECAM BG PAL SECAM BG DK PAL I VHF BAND I VHF BAND III CABLE TV UHF BAND CH2-4 CH5-12 S1-41 CH21-69 CIRCUIT DIRECTLY TO DISCHARGE COMPLETELY . 14" 20", 21" Receiving channels: Audio outputs : High Voltage : Focus voltage : Grid 2 voltage : Heater voltage : Video/Audio Terminals : 2.0W RMS at %10 THD 2.5W RMS at %10 THD 23 ± 0.5 KV 25 ± 0.5 KV %25.6 ± %38 of EHT 0-1400 V 6.2 ± 0.2 Vrms AV1 IN AV1OUT AV2 IN (RCA, optional) 14" 20", 21" 14" 20", 21" Video : 1 Vpp,75 Ohm Audio : 0.5 Vrms, >10 Kohm RGB Video : 1 Vpp, 75 Ohm Audio : 0.5 Vrms, <1 Kohm Video : 1 Vpp, 75 Ohm Audio : 0.5 Vrms, >10 Kohm Operating temperature : Safety : X-Ray radiation : 1 0-45 Degrees IEC 65 /BS P2N ACC. IEC 65/BS P2N : TV set is produced to receive "one" of these colour and sound systems. 3 3. REMOTE CONTROL 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. . MUTE button Ten key program button Two digit program button (-/--) MENU button Program up button Volume decrease button Return to selected programme button (SWAP) Information button (i) STAND-BY button AV-TV selection button OK button Volume increase button Program down button 16:9 picture format button Sleep timer button Normalization button For Teletext Function (Opt.) Yellow fastext button Blue fastext button Teletext/TV select button Enlarge button UPDATE button MIX button Green fastext button Red fastext button STOP button SUB-PAGE button REVEAL button Special features · · · · · · · Automatic Programming 100 Programme Memory Available for Cable Channels (A decoder may be required) Manual Fine Tuning Skipping back to the last channel you have started to zapp via only one button(SWAP). 16:9 picture format Scart Socket: Video cassette recorder, satellite receiver, video disc player, DVD, TV games or a home computer can be connected to this AV socket with an appropriate connecting cable. Normalization system to recall the setting in memory after the colour, contrast, brightness setting have been changed. Automatic Volume Limiting. Infrared Remote Control. Your TV will automatically switch off if it's been programmed from 15 to 120 minutes. · · · · · · · · · · · · · · Automatically switch to Stand by five minutes after a channel ceases to transmit. Multi language menu system Naming the channels (Automatic with ATS). NTSC playback. S-VHS via Scart. ATS: Automatic Tuning System with country selection (*). Audio/Video RCA sockets (*). Headphone socket (*). Teletext reception (*). Zapping (*). I.P.S.: Intelligent Programme Switch: You can set your TV to skip to a specific Channel at a specific time. It works also as an alarm function (*). Childlock (*). Please Note: Zapping, I.P.S., Childlock are optional if ATS exists. · · · · (*): These features are not available in all models. 4 4. PREPARATIONS . MAIN SUPPLY CONNECTIONS Connect the TV mains plug into your domestic mains socket outlet (230 V 50Hz AC). Press the Program up, Program down button or Numeric Buttons on the remote handset to switch the TV on. AERIAL CONNECTION Using a 75 aerial lead connect your TV to the aerial outlet in your home. BATTERY FITTING Insert the 2 AAA Batteries supplied into the compartment on the rear of the remote control, ensure you follow the polarity diagram inside the compartment. 4 4 PIN CONNECTIONS FOR SCART SOCKET 11- RGB input, Green 2- Audio input Right 123- Audio output Left(Mono)13- Red ground 4- Audio ground 14- Ground 5- Blue ground 15- RGB input, Red 6- Audio input Left(Mono) 16- Blanking Signal 7- RGB input, Blue 17- Video output ground 8- Switching voltage 18- Video input ground 9- Green ground 19- Video output 1020- Video input 21- Screening CONNECTING TV WITH VIDEO AND SATELLITE/DIGITALRECEIVER 1- Audio output Right 5 5. OPERATING YOUR TV . D. TUNING THE TELEVISION There are two ways of tuning your television: · Manual, where you control the tuning process or Autoprogram where the television does it all automatically. · The TV sets equipped with ATS (Automatic Tuning System) sorts the channels regarding the broadcasting system of your country (optionally). Please Note If the TV is set to a channel with no signal the TV will return to standby after 5 minutes. The time remaining is displayed on the screen. Manual Tuning Tuning the TV is accessed through the SETUP menu. To access the SETUP menu: Press the MENU button twice. SETUP Menu will appear. A. ZAPP FUNCTON (OPTONAL) Select the programme you would like to recall by pressing SWAP button. Selected programme number will appear on the upper left side of the screen. Watching any programme, you can recall the selected one by pressing SWAP button again. If you press SWAP button again, you can recall the last programme you watched. You can cancel ZAPP function by pressing INFO button. B. SWAP FUNCTION Allows you to swap between the program you are watching and the last selected program. i.e. If you were watching Program 1 and change to Program 11, press the SWAP button to go back to Program 1. Press it again to return to Program 11. Note: If Zapping function is available SWAP function will not work. C. INFO By pressing the "WHITE (i)" button the programme number and programme name (if it is exist) will appear on the screen. This will disappear automatically after a few seconds. a) If you don't know the channel number (Tuning with SEARCH function). Enter the SETUP menu by pressing MENU button twice. In the SETUP Menu select PROGRAM NO and change to P1 using the Program down button to select it and the Volume up or Volume down button to change it. 6 Starting with Program P1, tune in the first channel as follows: Use the Program up button to select SEARCH.Press the Volume up or Volume down button to start the tuning search. The search arrow will appear. When the search finds a strong searching. The picture will appear, channel signal it will stop. Identify which channel you are watching (BBC 1, ITV 1 etc.) and decide which program number you want it to be. Use the Program down button to select PROGRAM NO. Use the Volume up/down buttons to select the program number. Use the Program down button to select STORE. Press the OK button and STORED will appear on the STORE line. You have now stored the first channel. Use the Program up button to select again SEARCH and continue the tuning procedure until you have tuned in all the programmes you want or the television can receive. b) If you know the channel number. (Tuning with channel numbers) Press the OK button to select "S" for cable channels and "C" for terrestrial broadcast. Use Volume up/down button to select the channel number or enter the channel number using the Numeric buttons. Use the Program down button to select PROGRAM NO. Enter the desired program number by using the Ten key program buttons Use the Volume up/down buttons to select the program number. Use the Program down button to select STORE. Press the OK button and STORED will appear on the STORE line. The channel will be stored with the program number you desired. You have now stored the first channel. Use the Program up button to select again CHANNEL and continue the tuning procedure until you have tuned in all the programmes you want or the television can receive. To exit the SETUP menu press the TXT button. Please note The system will displayed automatically on SYSTEM row i.e.BG, L, I, DK depending the receiving broadcasting system of the country. In some countries the broadcasting system can be both in BG/DK or BG/LL´.Only the TV sets produced with Pal Secam BG/DK or Pal Secam BG/LL´ systems can receive both BG/DK or BG/LL´ broadcasts. Please note If you do not press any buttons for 15 seconds the TV will exit the menu system. Automatic Tuning (Autoprogram) Enter the SETUP menu as before. 7 Use the Program down button to select AUTOPROGRAM and press the OK button. Please Note: a) On the TV sets equipped with ATS a COUNTRY SELECTION menu will appear. Select the desired country using Program and Volume buttons. Press the OK button to select the country and press the OK button again the Automatic Tuning System regarding the broadcasting system in the desired country. b) On the TV sets without ATS pressing the OK button starts AUTOPROGRAM. When you are sure the aerial is connected properly press the OK button and to confirm it press OK button again. To cancel Autoprogram whilst it is working press the Menu button. As Autoprogram stores a channel it will appear briefly on the screen. Your TV is now tuned and ready to use E. TV SET UP The TV set up is accessed through a menu system. Once you have stored your set up, this is the set up the TV will default to when you switch it on. Please note If you do not press any buttons for 18-19 seconds the TV will exit the menu system. There are three menus; · Picture Menu · Setup Menu · Features Menu · Picture Menu To reach the picture menu press one time to MENU button. BRIGHTNESS CONTRAST COLOUR SHARPNESS To change, for ex ...