Telestar ch.PT92 serw.man

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SERVICE MANUAL
PT92 CHASSIS
Modification reserved
 PT-92 Chassis Service Manual
CONTENTS
PAGE
1.Technical Data
4
2. Recommendation for service repairs
5
3. Handling of MOS chip components
5
4. X-Ray radiation precaution
5
5. Service Menu
6
6. Specification of the connector (Euroscart)
9
7. Component descriptions
10
8. Exploded view
11
9. Block Diagrams
14
10. Fault tracing diagram-power supply
17
11. Power Supply circuit diagram
18
12. Troubleshooting guide for main PCB
19
13. Descriptions of the integrated circuits
- TDA16846 SMPS IC
20
- TDA935X UOC IC
24
- TDA9875A TV SOUND IC (STEREO)
31
- TDA9870A TV SOUND IC (G. STEREO)
38
- TDA24C16 EEPROM
48
- TDA8351 VERTICAL IC (110
O
)
50
- TDA8356 VERTICAL IC (90
O
)
54
- TDA2616 STEREO AUDIO AMPLIFIER (110
O
)
58
- TDA2615 STEREO AUDIO AMPLIFIER (90
O
)
60
- TDA7056 MONO AUDIO AMPLIFIER (90
O
)
63
- TDA7057AQ HP AMPLIFIER
65
- TDA7050 HP AMPLIFIER
67
- TDA6107Q VIDEO OUTPUT AMPLIFIER
70
- TCDT1100 OPTO COUPLER
72
- TDA9830 TV SOUND AM DEMODULATOR
74
- TDA7710 DOLBY PRO LOGIC SURROUND
78
- BU2508AF HORIZONTAL TRANSISTOR (110
O
)
83
- BU508DF HORIZONTAL TRANSISTOR (90
O
)
86
- SPP03N60S5 SMPS MOSFET (90
O
)
89
- SPP04N60S5 SMPS MOSFET (110
O
)
91
14. Dolby and secam L mono board and circuits diagrams 93
15. Oscilloscope shapes
96
16. Chassis replacement part list
97
17. Main Circuit
113
3
PT-92 Chassis Service Manual
TECHNICAL DATA
CRT PANEL
Visible Picture
47 cm / 50 cm / 66 cm
Deflection Angle
90
o
/ 110
o
Vertical Frequency
50Hz
Horizontal Frequency
15.625Hz
ELECTRONIC
Program Number
100+AV
Teletext
Flof text
Tuner
Cable tuner - 8 MHz spacing for Hyper Band
TV System
European CCIR system
Music Power
110
o
2x8 Watt Rms 10% distortion
90
o
2x4 Watt Rms 10% distortion
CONNECTIONS
Euro AV Socket
Include
MAIN STAGE
Mains Voltage
165-260VAC
Mains Frequency
50Hz
Power Consumption
110
o
126W; 90
o
75W;
In Stby Mode
110
o
8 Watt 90
o
5 Watt
4
PT-92 Chassis Service Manual
RECOMMENDATION FOR SERVICE REPAIRS
1- Use only original spare parts. Only use components
with the same specifications for replacement.
2- Original fuse value only should be used.
3- Main leads and connecting leads should be checked
for external damage before connection.
Check the insulation.
4- Parts contributing to the safety of the product must
not be damaged or obviously unsuitable.
This is valid especially for insulators and insulating
parts.
5- Thermally loaded solder pads are to be sucked off
and re-soldered.
6- Ensure that the ventilation slots are not obstructed.
7- Potentials as high as 25 KV are present when this re-
ceiver is operating. Operation of the receiver
outside the cabinet or with back cover removed invol-
ve a shock hazard from the receiver.
Servicing should not be attempted by anyone who is
not thoroughly familiar with the precautions
necessary when working on high voltage equipment.
Perfectly discharge the high potential of the picture
tube before handling the tube. The picture tube is
highly evacuated and if broken.
Glass fragments will be violently expelled.
Always discharge the picture tube anode to the rece-
iver chassis to keep of the shock hazard before re-
moving the anode cap.
8- Keep wire away from the high voltage or high tempe-
rature components.
9- When replacing a wattage resistor in circuit board,
keep the resistor 10 mm away from circuit board.
HANDLING OF MOS CHIP COMPONENTS
MOS circuit requires special attention with regard to
static charges. Static charges may occur with any high-
ly insulating plastics and can be transferred to persons
wearing clothes and shoes made of synthetic materi-
als. Protective circuits on the inputs and outputs of mos
circuits give protection to a limited extend only due to
time of reaction.
Please observe the following instructions to protect the
components against damage from static charges.
1- Keep mos components in conductive package until
they are used. Most components must never be sto-
red in styropor materials or plastic magazines.
2- Persons have to rid themselves of electrostatic char-
ges by touching MOS components.
3- Hold the component by the body touching the termi-
nals.
4- Use only grounded instruments for testing and pro-
cessing purposes.
5- Remove or connect MOS ICs when operating volta-
ge is disconnected.
X-RAY RADIATION PRECAUTION
1- Excessive high voltage can be produce potentially
hazardous X-RAY radiation. To avoid such hazard,
the high voltage must not be above the specified li-
mit. The nominal value of the high voltage of this re-
ceiver is 25KV at zero beam current (minimum
brightness) under 220V AC power source. The high
voltage must not under any circumstance, exceed
30KV. It is recommended the reading of the high vol-
tage be recorded as a part of the service record. It is
important to use an accurate and reliable high volta-
ge meter.
2- The primary source of X-RAY radiation in this TV re-
ceiver is the picture tube. For continued X-RAY radi-
ation protection, the replacement tube must be
exactly the same type tube as specified in the part
list.
5
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