Products > Test Equipment
Another Hameg HM605: has anybody dug up full service manual in English?
MK14:
--- Quote from: stj on August 24, 2016, 05:47:14 am ---
--- Quote from: MK14 on August 24, 2016, 04:10:24 am ---
It could be failed electrolytic capacitors, which just about work when cold, but when hot, lose too much ability to work, enough when hot.
--- End quote ---
electrolytics dont work like that, they run better as they warm up.
this sounds like a solder joint or a semiconductor.
--- End quote ---
I've very little experience with repairing scopes. So I'm reasonably happy to stand corrected, as to the most likely faults.
What I should have said is that older electrolytic capacitors, sometimes fail/deteriorate, so the OP may want to check their condition. But I should not have claimed that it was a likely explanation for the x-axis fault.
Shock:
The symptom of working when tapping, then not (based on heat) is commonly dry/intermittent solder joints, dirty controls/pots is also a possibility.
madires:
Please see https://cdn.rohde-schwarz.com/hameg-archive/HM605_english.pdf ;)
MK14:
--- Quote from: madires on August 24, 2016, 02:42:40 pm ---Please see https://cdn.rohde-schwarz.com/hameg-archive/HM605_english.pdf ;)
--- End quote ---
That's nice, but the OP really wants the service manual to help repair it, rather than the user manual. We/OP have found them in German, but not the complete service manual in English. I guess the thread title is confusing, as it is really the service manual he needs/wants.
tronde:
Gentle tapping points towards a weak solder joint. The scope is about 30 years old, so nothing strange there and not uncommon in older Hameg scopes.
I would start with the time base board, page D9, and tap. Use a rather small screwdriver with a plastic handle, and tap lightly on the PCB with the handle while holding in the shank. Work systematically from one end of the board towards the other end as you observe the line on the CRT. It can be time consuming to track weak solder joints. They will most likely look like this. You can see the circular "trace" around the pin.
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