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K1
Schematic
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Service Manual
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BEKO K-1 Service Manual

Service Manual K1 CHASSIS
CONTENTS PAGE
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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
components marked with
on the schematics diagrams should not be replaced by other substitutes. Other substitute may create the electrical shock, fire or other
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.
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
HOT CHECK CIRCUIT
TO INSTRUMENTS
EXPOSED
METALLIC PARTS
AC-Voltmeter
Water pipe (earth)
devices such as insulation barriers, insulation papers, shields and isolation R-C
2 K Ohm
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,
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
connectors, control shafts etc. When the
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2. TECHNICAL SPECIFICATIONS .
Power source: 220-240V AC, 50-60Hz
Power consumption (nom.) : 55W 20”, 21”
Standby power consumption : 2 W
Aerial impedance : 75Ohm, coaxial type
Receiving system
PAL SECAM BG PAL SECAM BG DK PAL I
Receiving channels: VHF BAND I CH2-4 VHF BAND III CH5-12 CABLE TV S1-41 UHF BAND CH21-69
Audio outputs : 7W RMS at %10 THD 20”, 21”
High Voltage : 25 ± 0.5 KV 20”, 21”
Focus voltage : %25.6 ± %38 of EHT
Grid 2 voltage : 0-1400 V
Heater voltage : 6.2 ± 0.2 Vrms
Video/Audio Terminals : AV1 IN Video : 1 Vpp,75 Ohm
Audio : 0.5 Vrms, >10 Kohm RGB AV1OUT Video : 1 Vpp, 75 Ohm Audio : 0.5 Vrms, <1 Kohm AV2 IN (RCA, optional) Video : 1 Vpp, 75 Ohm Audio : 0.5 Vrms, >10 Kohm
Operating temperature : 0-45 Degrees
Safety : IEC 65 /BS P2N
X-Ray radiation : ACC. IEC 65/BS P2N
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: TV set is produced to receive “one” of these colour and sound systems.
1
: PAL BG
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3. REMOTE CONTROL .
Special features
• Your TV can receive stereo channels directly(NICAM optional).
• Automatic tuning system with country selection.
• 100 Programme Memory
• Available for Cable Channels (A decoder maybe required)
• Manual Fine Tuning
• Child Lock
• Return to the last channel viewed (SWAP)
• Spatial Sound effect
• 16:9 picture format
• S-Video connection (optional)
• Audio/Video RCA sockets (optional).
• Normalisation system to recall the setting in memory after the colour,contrast, brightness setting have been changed.
• Picture adjustment using one button (Smart control).
• Sound adjustment using one button (Smart control).
• Equalizer Sound Setup
• Automatic Volume Limiting
• Your TV set is equipped with an On-Screen Display system. This system enables the user to see the function on-screen and to control them efficiently.
• Infrared Remote Control
• Virtual Dolby Surround (optional)
• Dynamic Bass (optional)
• Multi language menu system
• On Timer
• Off Timer
• Stereo headphone socket (optional)
• 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.
• Second scart socket (optional)
• Naming the channels
• Teletext reception
• Auto recognition of the broadcasting format (4:3, 16-9) via WSS feature.
• Digital Colour Transition Improvement (DCTI) (Optional).
• Digital Comb Filter (DCF) (Optional).
• Digital Luminance Transition Improvement (DLTI) (Optional)
• Dynamic Noise Reduction (Optional)
• Picture and Text (optional)
• Blueback (Optional)
• Component input via Scart (optional)
• Program Naming, Editing
• Quick Program Display
• Games (Optional)
• Now&Next (TV Guide), (Optional)
• Alarm function (Optional)
(*): These features are not available in all models.
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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 75Ω 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.
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4
PIN CONNECTIONS FOR SCART SOCKET
1-
Audio output Right 11- RGB input, Green 2- Audio input Right 12- 3- 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 10- 20- Video input 21- Screening
CONNECTING TV WITH VIDEO AND SATELLITE/DIGITALRECEIVER
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5. OPERATING YOUR TV .
A. 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.
C. 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
B. AV
Press theAV button to select your For use when you are connecting an
external source to your TV (Video recorder, DVD player etc.) via the SCART sockets or RCA sockets.
See ‘Connecting external equipment’.
Press the AV button to select your input as follows:
2 Scart models:
1 AV1 when using SCART socket 1.
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. There are two ways to access the SETUP
menu:
Press the blue Setup button or Press the Menu button and use the Program down button to select SETUP. Press the OK button to enter the SETUP menu.
2 AV2 when using SCART socket 2. 3 AV2-S for S-Video equipment. (Optional) 4 AV3 when using the RCA sockets of the TV. (Optional) 5 AV3-S when using the S-video socket and RCA audio sockets of the TV. (Optional)
1 Scart models:
1 AV1 when using SCART socket 1. 2 AV2 when using the RCA sockets of the TV. (Optional) 3 AV2-S when using the S-video socket and RCA audio sockets of the TV. (Optional)
Press the AVbutton again to return
toTV
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. In this case the user can select the required SYSTEM using Volume up/down buttons.
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Please note
If you do not press any buttons for 15
seconds the TV will exit the menu
system.
In the Setup menu select PROG NO
and change to P1 using the Program
down button to select it and the
Volume up button to change it.
Starting with Program 1, tune in the
first channel as follows:
Use the Program down button to
select SEARCH.
Press the Volume up or Volume
down button to start the tuning
search.
When the search finds a strong
channel signal it will stop searching.
The picture will appear.
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 theOK button and STORED will appear on the STORE line.
Tuning with channel numbers
Enter the SETUP menu by pressing the blue button. Press the OK button to enter the CHANNEL row.
Use the OK button to select “S” for cable channels and “C” for terrestrial broadcast.
Use Volume up button to select the channel number buttons.
Enter the channel number using the Numeric buttons.
Press the Program down/up buttons to exit the channel row.
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. To exit the SETUP menu press the TV/TX button.
Automatic tuning (Autoprogram)
Enter the SETUP menu as before.
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.
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Use the Program down button to select AUTOPROGRAM and the OK button. A list of Press countries will appear. Select the desired country using Program and Volume buttons.
When you are sure the aerial is connected properly press the OK button. Autoprogam will start.
To cancel Autoprogram while it isworking press the Menu button.
Your TV is now tuned and ready to use.
Please note:
If auto sort fails to arrange the programmes in the required sequence please refer to programme table.
Fine tuning
Although the search and Autoprogram will automatically try and tune to the best reception, in areas of poor reception a bit of fine tuning may be required.
In the SETUP menu use the Program up/down buttons to select FINE TUNE. Use the Volume up and Volume down buttons to fine tune.
When you have finished use the Program down button to select STORE and press the OK button.
D. FEATURES
1-) TV GUIDE(Optional)
You can see the TV Guide information on the screen by pressing "DOUB" button while a provider channel or a supported channel by provider is selected. The information of the current and next programmes which is sent by provider is displayed on the screen.
Note: TV Guide information may not have for all programmes. It depends on the broadcasting and determined by broadcasting company.
Note: TV Guide is not displayed on the screen, if there is not a provider in the saved channels.
DATE: Date information is given by provider channel. You can use the numeric buttons to change the date.
PROVIDER: Provider is the channel which send the TV Guide information. You can select the provider via this function. Press Volume up/down buttons to select the provider and then press "OK".
.
STATION MATCH: The supported channels by provider may not be defined automatically. You can open this menu and define the provider for these channels. Adjusting the provider just one time is enough for these channels.
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DISPLAY INFO: If you want to see the TV Guide information automatically while changing the channels, this option should be open. In this case, if you open the provider channel Mini Guide occurs on the screen.
2-) PAT (Picture and Text) (OPTIONAL)
In the double window function, you can also display the teletext screen in the second window.
3-) PIP Picture Position Change
Press the POS button repeatedly until desired position is achieved. The PIP picture moves clockwise.
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6. K1-K5 ŞASİ BLOK DİAGRAMI .
FBT
TR 502
SCART 1
115 V / 122
SCART 2
2 T U
O V
1 T U
O V
POWER AMP.
IC 301 AN 5277
AOUT1R
AOUT1L
MUTE
B
R
G
IC 201
SWITCH
MC14052B
T703
RGB IN
54
CVBS OUT
40
30/31/32
Video-Controller-
16
T701, T702,
CRT MODÜLÜ
7
6
71/72/73
47
50
49
FRONT AV
DVD/SCART
CVBS OUT
H-OUT
11
41
10
Family
IC 101
Text-IFAudio IC
14
58
57
17
SAPTIRMA
HORIZONTAL
60
2SD2586
H-SYNC
61
8584 59
VPROT
VDR Q
VDR T
IC 501
SAPTIRMA
TDA 8357
VERTICAL
EHT 45 V 33 V 12 V
KEYBOARD & IR
LED
IR
TUNER
SCL SDA IF1 IF2
AGC
SDA
SCL
EEPROM
WR. PRO.
IC 401
24C16
SDA
SCL
220V AC in
IC 602
ICE1QS01
SMPS CONT.
SMPS
TR601
6.5 V 5 V 3.3 V 1.8 V
115/122 V24 V 12 V 8 V
7. IC DATASHEETS&SPECS .
7.1)VCT 49XYI GENERAL DECRIPTION
The VCT 49xyI is an IC family of high-quality singlechip TV processors. Modular design and deep­submicron technology allow the economic integration of features in all classes of single-scan TV sets. The VCT 49xyI family is based on functional blocks contained and approved in existing products like DRX 396xA, MSP 34x5G, VSP 94x7B, DDP 3315C, and SDA 55xx. Each member of the family contains the entire IF, audio, video, display, and deflection processing for 4:3 and 16:9 50/60-Hz mono and stereo TV sets. The integrated microcontroller is supported by a powerful OSD generator with integrated Teletext & CC acquisition including on-chip page memory.
Features
The VCT 49xyI family offers a rich feature set, overing the whole range of state-of-the-art 50/60-Hz TV applications. – PSSDIP88-1/-2 package – PMQFP144-2 package – Submicron CMOS technology – Low-power standby mode
– Single 20.25 MHz reference crystal – 8-bit 8051 instruction set compatible CPU – Up to 256 kB on-chip program ROM – WST, PDC, VPS, and WSS acquisition – Closed Caption and V-chip acquisition – Up to 10 pages on-chip teletext memory – Multi-standard QSS IF processing with single SAW – FM Radio and RDS with standard TV tuner – TV-sound demodulation:
• all A2 standards
• all NICAM standards
• BTSC/SAP with MNR (DBX optional)
• EIA-J – Baseband sound processing for loudspeaker channel:
• volume and balance
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