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cmjones01 · 27th Dec 2015, 9:58 am

There are three versions of this scope - the 545, 545A and 545B. If you have no letters after the number as you say, then you may have the original 545. If my memory is correct, one way to tell is that the timebases on the 545 had two knobs, one for time per division (1-2-5 microseconds) and another for the multiplier (1-10-100). The 545A changed that to the conventional single knob with all the different time scales on.

I have a 535A, the 545A's lower bandwidth brother. As others have said, check the power supplies first. The manual describes all the test points. The -150V is the most important as it's the reference for all the others (+100V, +225V, +350V, +500V).

Also check for finger trouble. What have you got the trigger controls set to? Try cranking the stability control all the way clockwise, which should force the timebase to run. Does the scope have neon indicators above the screen showing the beam position? If so, can you get each of them to light by twiddling the horizontal and vertical position controls?

Chris

27th Dec 2015, 9:58 am	#10
cmjones01 Nonode Join Date: Oct 2008 Location: Warsaw, Poland and Cambridge, UK Posts: 2,681	Re: Tektronix 545 Oscilloscope fault There are three versions of this scope - the 545, 545A and 545B. If you have no letters after the number as you say, then you may have the original 545. If my memory is correct, one way to tell is that the timebases on the 545 had two knobs, one for time per division (1-2-5 microseconds) and another for the multiplier (1-10-100). The 545A changed that to the conventional single knob with all the different time scales on. I have a 535A, the 545A's lower bandwidth brother. As others have said, check the power supplies first. The manual describes all the test points. The -150V is the most important as it's the reference for all the others (+100V, +225V, +350V, +500V). Also check for finger trouble. What have you got the trigger controls set to? Try cranking the stability control all the way clockwise, which should force the timebase to run. Does the scope have neon indicators above the screen showing the beam position? If so, can you get each of them to light by twiddling the horizontal and vertical position controls? Chris __________________ What's going on in the workshop? http://martin-jones.com/