Most people get stuck straight away on the intensity and trace position controls. I add a photo of the schematic and the green are the parts i replaced.įirst pay close attention of what you see in the beam finder and where the position of the dot is, along with its length and constancy. The question is can i connect the rods with voltages like that? Especialy the last which is little too high at the beggining? I dont want to do further damages to the scope. +100v is +92.7v +37v is +35,3v +8,6v is +8,7v -8,7v is -8,8v +5,2v is when i power it it was about +14v but dropping and after few seconds it fall to about +8 and maybe it will fall more but i disconnect scope from the power because scope is so bright that i am afraid i can damage it and brightness potentiometer is not working - maybe because i disconnected the rods from the power supply. I also found that two little philips capacitors 47uf 10v have only 65pf so i replace them too? The scope without supplying the rest (by disconnecting rods) when i power it on nothing blow up and after a while i see dot on the scope and it was soo bright I measure the voltages and it is much better but not perfect.
I found three transistors faulty so i replace them to the same parts that should be like in the service manual. I found that one of the TL594 was fault but i replace two of them. I would be verry happy if someone can help me.Īfter some while i check what i can and i found a few fault parts. Must i check somethink else before powering it after replacing the parts. I ordered the parts and want to replace it. Do someone know what it is? Because it is shorted between all 3 legs. It has 476-02 Numbers on it and sign of Motorola. Am i thinking right? And i also check transistors on the heatsink and 3 of them are TIP30C and one of them is shortet between emiter and colector so there is also problem. I found out on the YouTube the video about similar scope and i found that the problem could be on the TL594CN pwm driver and i think the problem is there because i measure voltages on the Vcc input and on the first it was 65,4v and on the second 30V and the reference voltages on the first it was 0V and on the second 5,9V so i think the one is damaged. What can i do now to find what is wrong? I disconnect power supply from the rest by desolidering jumpers and there was no change in the voltages. When i pluged it and power on nothing is working, no any sign of powering. Hello, i buy Tektronix scope and it supposed to work but it isnt.
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