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Well, I resisted the hammer-urge and went looking for info on the EX730, and hopefully a schematic, but alas, it was not to be. What I did find was **broken link removed** site, which contains lots of info on multimeters, including quite a few schematics. Also linked to is a list of...
I've just fried my Extech EX730 clamp meter while developing something that used a 230V-12V transformer in reverse, and 18V on its secondary. Given that the meter is rated to 600V, I figured there would be no problem! Now I have a meter on which only the temperature and frequency functions...
Hi sdumas. I don't believe it, a proper schematic, board-layout and all - I had long since given up any hope of finding this!!!:shock: Thank you ever so much! :grin: :grin: :grin:
Regarding the UB1202AM, pin-out wise, the schematic seems identical to the actual circuit-board layout, I think...
Just a little update which may be of interest to some. The genesis of the fault appears to have been a 100nF decoupling capacitor that 'kinda' went short. 'Kinda' 'cos although I removed it from circuit, checked the resistance across it, which was about 100 Ohms, and a capacitance test showed...
Wow, I've been thrown a bone, thanks for that!!! Now at least I've got something to go on and I should be able to check if these op-amps are the problem. I can also order them if necessary, which is great too! :)
Things are looking up a bit as well. I spent and hour or so on it again today...
Well, things aren't going according to plan - I just killed my one working channel, junked the scope basically!
Working almost completely in the dark, I figured from voltages reading etc. that the little 8-pin I.C. pictured below was a voltage regulator of some kind - again, another part number...
This is the User Guide & Service Manual I mentioned I had already found. Repair-tips along the lines of "if the power supply isn't working, replace the power supply..." makes this 'repair information' essentially worthless...
A circuit diagram of some kind - even a block-diagram - is needed...
Hi. Channel 1 inexplicably stopped working on this 'scope - in use for hours, working perfectly, turned off & switched on the following day, no channel 1!
Channel 2 still work fine in all respects when connected to the test-waveform, whereas channel 1 displays either a flat trace, or a blank...
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