Grundig ST 03, Руководство по обслуживанию

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GRUNDIG Service 1 - 2
General Section ST 03
Table of Contents
Page
General Section ..................................... 1-1... 1-8
Safety Advice ............................................................................... 1-2
Technical Data .............................................................................. 1-2
Remote Control TRC 1 ................................................................. 1-3
Remote Control TRC 2 ................................................................. 1-3
Brief Service Instuctions ............................................................... 1-4
Fasttext Operation ........................................................................ 1-4
Operating Hints ............................................................................. 1-5
Circuit Descriptions .............................. 2-1... 2-3
1. Power Supply ......................................................................... 2-1
2. Tuner and Demodulator Circuits ............................................ 2-1
3. Peritel Output ......................................................................... 2-1
4. Video Chroma Processing ..................................................... 2-1
5. Delay Line .............................................................................. 2-1
6. Time Base Generator ............................................................. 2-2
7. RGB Drivers ........................................................................... 2-2
8. System Microcontroller (IC500) .............................................. 2-2
9. Output Power Stages ............................................................. 2-3
10. Video Output Stages .............................................................. 2-3
11. Teletext Options ...................................................................... 2-3
12. Power Supply to MSP 3400/3410 .......................................... 2-3
13. Second Peritel and Mute Circuit ............................................. 2-3
14. Audio Amplifier ........................................................................ 2-3
Alignment ....................................................... 3-1
Layout of the PCBs
and Circuit Diagrams ......................... 4-1... 4-22
Chassis Board .............................................................................. 4-1
Oscillograms ................................................................................ 4-8
Deflection H+V ............................................................................ 4-10
Power Supply ............................................................................. 4-11
Signal Board .............................................................................. 4-13
Y/C Processing ........................................................................... 4-15
Audio Board Circuit Diagram ...................................................... 4-17
Audio Board PCB ........................................................................ 4-19
Text ............................................................................................ 4-21
CRT Panel ................................................................................. 4-21
Spare Parts List .................................... 5-1... 5-4
Safety Advice
The X-radiation developing in the sets conforms to the X-radiation
Regulations (January 8, 1987), issued by the Physikalisch-Techni-
sche Bundesanstalt (federal physiotechnical institution).
The high tension for the picture tube and thus the developing X-
radiation depends on the precise adjustment of the +A power
supply.
After every repair of the power supply unit or the horizontal deflection
stage it is imperative that the EHT for the picture tube is checked and
re-adjusted if necessary.
To avoid consequential damages to the chassis or the picture tube
the integrated protective circuits are allowed to be put out of
operation only for a short time.
When replacing the picture tube use only the types specified in the
spare parts lists.
Technical Data
TV Receivers .............................................. 20" / 21"
Mains voltage .............................................. 220…240V ~ 50/60Hz
Control range of the power supply .............. 190…264V
Screen diagonal .......................................... 51cm / 55cm
Picture diagonal .......................................... 48cm / 52cm
Power consumption ..................................... ca. 55W
Power consumption in Standby ................... ca. 8W
Aerial socket ............................................... 75
Ω
coaxial plug
Programmes ............................................... 99 + 2AV
Standard ..................................................... PAL/I
Output power .............................................. 2x5W RMS
Temperature range ...................................... 0 - 40
°
C
General Part
Test Equipment / Aids
Variable isolating transformer Test/Sweep Generator
Colour Generator Oscilloscope
DC Voltmeter AF Voltmeter
AF Generator Frequency counter
Please note the Grundig Catalog "Test and Measuring Equipment"
obtainable from:
Grundig electronics GmbH
Würzburger Str. 150
D-90766 Fürth/Bay.
Tel.0911/703-0
Telefax 0911/703-4479
The regulations and safety instructions shall be valid as provided by the "Safety" Service Manual, part
number 72010-800.00, as well as the respective national deviations.