05-07-2023, 10:58 PM
Tests carried out:
- the wiring diagram of the receiver differs slightly from reality
- separator circuit - correct
- vertical deflection - correct
- horizontal deflection - reduced oscillator frequency, outside the adjustment range - change in the value of the resistor R66 - correct result, but without affecting the image
- video sections - generally without significant irregularities, but I found an additional resistor with a capacitor soldered non-factory within the CRT socket, parallel to R28. After removing these two elements, the correct image appeared on the screen without horizontal stripes
- no sound - replacement of a new 6P25 with another new one solved the problem - poor emission. Fortunately, I originally bought two
- suddenly the image disappeared - subsequent tests showed a problem with the R27 at the V6 final vision amplifier. He looked good overall. When touched with a screwdriver, it broke in half and then turned to dust. After replacing the image came back
- tuning all sections of the TV according to the instructions - improving the picture and sound
- the picture deteriorated, slight tremors - the reason was the V9 in the audio system - 6LD20. After replacement, the image is stable. H-K short circuit
- From the very beginning I was intrigued by the vertical deflection transformer with vertical arms near the neck of the CRT. Their distance from the neck is quite large, about 25 mm. The transformer arms have a large adjustment range, at least a few centimeters horizontally. Changing their position by 2-3 cm does not affect the image at all. This system therefore has high energy and at the same time inertia/tolerance. I don't know what the blades on both ends of the transformer's arms mean - see photo
In the end, there was still the problem of collapsing the image on the left.
Baird T5 stimulates circulation. It is a pity that the owner of the TV Ambassador did not have two of these in the package.
- the wiring diagram of the receiver differs slightly from reality
- separator circuit - correct
- vertical deflection - correct
- horizontal deflection - reduced oscillator frequency, outside the adjustment range - change in the value of the resistor R66 - correct result, but without affecting the image
- video sections - generally without significant irregularities, but I found an additional resistor with a capacitor soldered non-factory within the CRT socket, parallel to R28. After removing these two elements, the correct image appeared on the screen without horizontal stripes
- no sound - replacement of a new 6P25 with another new one solved the problem - poor emission. Fortunately, I originally bought two
- suddenly the image disappeared - subsequent tests showed a problem with the R27 at the V6 final vision amplifier. He looked good overall. When touched with a screwdriver, it broke in half and then turned to dust. After replacing the image came back
- tuning all sections of the TV according to the instructions - improving the picture and sound
- the picture deteriorated, slight tremors - the reason was the V9 in the audio system - 6LD20. After replacement, the image is stable. H-K short circuit
- From the very beginning I was intrigued by the vertical deflection transformer with vertical arms near the neck of the CRT. Their distance from the neck is quite large, about 25 mm. The transformer arms have a large adjustment range, at least a few centimeters horizontally. Changing their position by 2-3 cm does not affect the image at all. This system therefore has high energy and at the same time inertia/tolerance. I don't know what the blades on both ends of the transformer's arms mean - see photo
In the end, there was still the problem of collapsing the image on the left.
Baird T5 stimulates circulation. It is a pity that the owner of the TV Ambassador did not have two of these in the package.
