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SERVICE MANUAL
EC Chassis
Modification reserved
Eco Eco Chassis Service Manual
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Eco Eco Chassis Service Manual
Table Of Contents
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Component description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Service Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Adjustment procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Troubleshooting guide for main chassis . . . . . . . . . . . . . . . . . . . . . . . . .24
Scart specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Description of the circuit
*STV2110B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
*STV8224A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
*STV8225 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
*TDA8174 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
*STV8223 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
*TDA2822M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
*TEA5101B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
*BUH515D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
*CF70095ANW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
*CF70200NW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
*CF72306 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
**Spare Part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Exploded view
layout of the pcb's and circuit diagrams
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Eco Eco Chassis Service Manual
TECHNICAL DATA
F.TXT CRT PANEL Ultra Ultra S.TXT Ultra
Visible Picture 37cm 37cm 37cm
Deflection Angle 90 90 90
Vertical Frequency 50Hz 50Hz 50Hz
Horizontal Frequency 15.625Hz 15.625Hz 15.625Hz
ELECTRONIC
Program Number 64+1 AV 64+1 AV 64+1 AV
Teletext - Simple Text Fast Text
Tuner VST VST VST
Including Hyper Band Including Hyper Band Including Hyper Band
TV Standards Pal-Secam Pal-Secam Pal-Secam
B/G-L/L'-I-DK B/G-L/L'-I-DK B/G-L/L'-I-DK
Music Power 1W 1W 1W
CONNECTIONS
Euro AV Socket Including Including Including
MAIN STAGE
Mains Voltage 175-250VAC 175-250VAC 175-250VAC
Mains Frequency 50Hz 50Hz 50Hz
Power Consumption 60W 60W 60W
Power Consumption
In Stby Mode 10W 10W 10W
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Eco Eco Chassis Service Manual
RECOMMENDATION FOR SERVICE REPAIRS
1- Use only original spare parts. Only use components volve a shock hazard from the receiver.
with the same specifications for replacement. Servicing should not be attempted by anyone who
2- Original fuse value only should be used. is not thoroughly familiar with the precautions
3- Main leads and connecting leads should be chec- necessary when working on high voltage equip-
ked for external damage before connection. ment.
Check the insulation. Perfectly discharge the high potential of the pictu-
4- Parts contributing to the safety of the product must re tube before handling the tube. The picture tube
not be damaged or obviously unsuitable. is highly evacuated and if broken.
This is valid especially for insulators and insulating Glass fragments will be violently expelled.
parts. Always discharge the picture tube anode to the re-
5- Thermally loaded solder pads are to be sucked off ceiver chassis to keep of the shock hazard before
and re-soldered. removing the anode cap.
6- Ensure that the ventilation slots are not obstructed. 8- Keep wire away from the high voltage or high tem-
7- Potentials as high as 25 KV are present when this re- perature components.
ceiver is operating. Operation of the receiver 9- When replacing a wattage resistor in circuit board,
outside the cabinet or with back cover removed in- keep the resistor 10 mm away from circuit board.
HANDLING OF MOS
CHIP COMPONENTS
MOS circuit requires special attention with regard to til they are used. Most components must never be
static charges. Static charges may occur with any stored in styropor materials or plastic magazines.
highly insulating plastics and can be transferred to 2- Persons have to rid themselves of electrostatic char-
persons wearing clothes and shoes made of synthetic ges by touching MOS components.
materials. Protective circuits on the inputs and outputs 3- Hold the component by the body touching the ter-
of mos circuits give protection to a limited extend only minals.
due to time of reaction.
4- Use only grounded instruments for testing and pro-
Please observe the following instructions to protect the cessing purposes.
components against damage from static charges. 5- Remove or connect MOS ICs when operating volta-
1- Keep mos components in conductive package un- ge is disconnected.
X-RAY RADIATION
PRECAUTION
1- Excessive high voltage can be produce potentially voltage be recorded as a part of the service re-
hazardous X-RAY radiation. To avoid such hazard, cord. It is important to use an accurate and reliab-
the high voltage must not be above the specified li- le high voltage meter.
mit. The nominal value of the high voltage of this re- 2- The primary source of X-RAY radiation in this TV re-
ceiver is 25KV at zero beam current (minimum ceiver is the picture tube. For continued X-RAY radi-
brightness) under 220V AC power source. The high ation protection, the replacement tube must be
voltage must not under any circumstance, exceed exactly the same type tube as specified in the part
30KV. It is recommended the reading of the high list.
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Eco Eco Chassis Service Manual
POWER CORD
SAW FILTER
IR SENSOR
VOLTAGE REGULATOR
ON/OFF SWITCH
LINE FILTER
PTC
NPN TRANSISTOR
PNP TRANSISTOR
CERAMIC FILTER
COIL
LINEARITY COIL
FUSIBLE RESISTOR
IW METAL OXIDE RESISTOR
1/2W METAL OXIDE RESISTOR
1/4 OR 1/6W CARBON FILM RESISTOR
CERAMIC CAPACITOR /POLYESTER CAPACITOR
ELECTROLYTIC CAPACITOR
DIODE
ZENER DIODE
SWITCH JUMPER
NET (INPUT)
NET (OUTPUT)
TACT SWITCH
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Eco Eco Chassis Service Manual
SERVICE
INSTRUCTION
VCR COMPUTER AND DECODER CONNECTIONS ...........8
- Video Cassette recorder (VCR) connection . . . . . . . . . . . . . . .
- Decoder Connection
- VCR Connection via Scart Socket
- Computer Connection via Scart Socket
- Decoder Connection via Scart Socket
OPERATION OF THE TELEVISION
- Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
- Stand by Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
- Programme Number Selection . . . . . . . . . . . . . . . . . . . . . . . . .9
- Mute Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
- AV Selection Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
- Analogue Level Selection Key . . . . . . . . . . . . . . . . . . . . . . . . .11
- Brightness Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
- Colour Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
- Contrast Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
- Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
- Status Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
PROGRAMMING THE TV CHANNELS
- Power Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
- Access to The Menu Program . . . . . . . . . . . . . . . . . . . . . . . . .14
- Selection of The Desired Function . . . . . . . . . . . . . . . . . . . . . .14
- Automatic Channel Searching . . . . . . . . . . . . . . . . . . . . . . . .14
- Band Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
- Memorisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
- Skipping unused Program Positions . . . . . . . . . . . . . . . . . . . . .16
- Stopping Automatic Searching . . . . . . . . . . . . . . . . . . . . . . . .16
- Fine Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
- Changing The Program Number . . . . . . . . . . . . . . . . . . . . . . .17
- Standard Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
- Memorisation of Analogue Levels . . . . . . . . . . . . . . . . . . . . . .18
SLEEP TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
TELETEXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
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ADJUSTMENT PROCEDURE
Due to the concept, all the following adjust- LF3 to get correct demodulation and 4,5 volts on
ments can be performed after a short warming pin 2 (AFC).
time (1 minute) 4.1.2 With a spectrum analyzer
Switch off the AFC by grounding the IDENT signal.
1. POWER SUPPLY The analyzer probe is connected at the output
Adjust with potentiometer PP1, 105 volts on DP 10 of the TUNER. Connect the RF generator with
cathode.
Tuner input (The choice of frequency doesn't
influence the adjustment result).
2. SCANNING ADJUSTMENTS Tuner until you find frequency at 38.9 on PT4.
2:1 Horizontal:
Adjust LF3 - see 4.1.1-.
Adjust R14 for correct Phase
4:2 AGC
2:2 Vertical
Connect RF generator with a signal of 2mV on
Adjust RD11 (Vertical amplitude) to get correct mid range VHF high.
picture height,
Adjust potentiometer RF 10 on the threshold of
voltage decreasing on pin 1 of the Tuner (PT6).
3. COLOUR DECODER ALIGNMENT
INSTRUCTION 5. ADJUSTMENTS DEPENDING ON THE
The procedure is recommended as follows:
PICTURE TUBE
BAR pattern generator in SECAM. First adjust Focus with special points pattern with
At first the SECAM bell filter has to be aligned medium contrast and correct brightness.
with L4. Use first a scope on pin 17 IC1 Cut off is performed automatically, G2 is
Color identification must be adjusted by L1 test adjusted to get black level at 150/160 volts on
point on PT3. readjust BELL filter test point PT3. green cathode, depending on the picture tube
Discriminator Blue and Red adjusted by L3 test specification.
point on pin 26. PT2, and I 2 test point on pin PV1 (blue gain) and PV2 (red gain) allow to
29.(Control by the eye on a grey colored adjust the white you need, with color analyzer or
pattern). compared with a reference.
Adjust R25 DL level for egalizing amplitude of Peak and mean beam current limited are
direct and delayed lines (PT3 or the eye) Switch adjusted by software.
to a PAL DEM pattern, and adjust phase of delay
line with L5 (using a scope or the eye).
6. UNITEXT
LT1 adjustment: Pin 2 of ICT1 adjust 64