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Gould Delta 9500A Oscilloscope Manual, other info
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Tomek_mal:
Hello, I also bought not working Gould delta 9500a. Person who sold me this scope said that battery was replaced and some traces damaged by leaking battery were fixed. Scope didnt react on power button but replacing dryed caps did the job. Now after pressing power button screen gest light up and thast it. Scope does not boot. EPROM's are ok, checksums are correct. There is one trasciever heating immediately to 115 celsius without any short to gnd or vcc. Replacing it has no effect. I checked all voltages etc. and there are no other strange things except that trasciever. Any ideas what to do next?
andrejr:

--- Quote from: Tomek_mal on October 08, 2023, 06:35:11 am ---Now after pressing power button screen gest light up and thast it. Scope does not boot. EPROM's are ok, checksums are correct. There is one trasciever heating immediately to 115 celsius without any short to gnd or vcc. Replacing it has no effect. I checked all voltages etc. and there are no other strange things except that trasciever. Any ideas what to do next?

--- End quote ---

Have you tried the following:

Holding the "Hold All" button on the scope while turning it on, then releasing and re-pressing it when it beeps, clears the memory and puts the scope into calibration mode.

Btw, which transciever?
Tomek_mal:
Yes, I tried it right after I read your post. After turing on just one led (trigger) lights up on maybe half a second and nothing more. When I hold this button on starting scope nothing happens.


Transciever U519, its between MC68340FT25E and NEC processor.
andrejr:
Well, this component doesn't get very hot on my scope. I don't have a thermometer (except a multimeter thermal probe, which I can't find), it's lukewarm to the touch.
Tomek_mal:
Could you check for me voltages on power supply connector? I am not sure about two voltages. Maybe the problem is basic.
Looks like only the logic part of scope has a problem.
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