I wrote a nice email to Hameg support as you suggested. Don't know why I didn't think of that in the first place. So now I'm waiting patiently :- Kind regards Jesper. As far as I am concerned, they gave me a link to a repair-shop, which wasn't helpful at all.
Best wishes! I find only the Hameg service manual on the internet space but this model have quite a different schematics. And without the schematic I don't want to risk with measurement in HV part. I tried to change Optocoupler CNY which is on the power supply board, but nothing changes, Checked all transistors in the power supply and CRT board.
No burned components, "cold soldering" problems, or any other obvious defects. Anyway I need service manual or schematic for Hameg HM model. Guys if you have idea where can I get service manual for HM please share I will appreciate that.
Posts: I have only documents about the base time board, I don't know if it could help The following users thanked this post: sangokaz. An old topic. I too searched in vain for the HM service manual. The timebase board looks the same too. Hello, guys! Here you have all the schematics from the service manual for Hameg HM I don't have a service manual of this scoop and i hope someone can give me some directions how to solve this problem. This could be a symptom of a PSU issue. However a word of caution: The PSU board has some very high and potentially lethal voltages present on the output side!
For example, test points MPT14 v , MPT15 v should not under any circumstances be probed without a suitable DMM equipped with an appropriate high voltage probe. I would like to think that there is adequate shielding to protect these areas but there seems to be no indication of this by just looking at the service manual. Also please take note of the safety information at the top left of the circuit diagram. If you have no experience then I would not advise probing around the board without some assistance from an experienced person.
Armadillo Super Contributor Posts: Country:. Certainly cleaning the contacts is worth a try. If this settles the jumpy lines problem, then if you have not already done so, follow this up with compensating the probes after your oscilloscope has had time to warm up.
Lets hope it is a simple as that! Going just by the 2 photos, I can see 3 possible clues that the calibration square wave is set on 1MHz, with the scope probe on X1, which would make the square's edges a bit rounded. Make sure it's on 1kHz for now. That took much longer than I thought it would.
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