Hameg 205-3 Service Manual
Hi there I scored a Hameg HM1507-3 analog/digital scope from the trash bin (see photos of that model here: ). However, it seems as if it is not working. The screen remains black (more precisely: green), no activity whatsoever. Following things I noticed: - User interface seems to work well. All the buttons, the beeper and LEDs react as expected. So the 'logic' side of things seems to be ok. The filament of the tube does glow Because I cannot see anything on the screen I suspect that the acceleration voltage of the tube has a problem, at least that's what I would like to check first.
My question is: How? How to check the high voltage without damaging the device and, more importantly, without damaging me? Oh and by the way, does someone have the schematics for this model? Best regards, para. Your hunch was quite close.
The (protection?) diode right next to the transistor was faulty. By soldering the diode from the working channel to the faulty one I could revive the bad channel.
So I'm quite lucky that the diode is the only part that suffered from that 'incident' I couldn't quite figure out the number of the diode, that's why I've marked it in your last attachment. If you could give me the exact part number I'll order a replacement part and will have (thanks to your help) saved a fine bit of gear from the landfill. For completeness: The faulty diode D2001 is of type BAQ34. Hameg was very helpful, they sent me the service manual by Email at no cost containing all the schematics. A little word on the repairability of this device: I was not really amused.
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No silk-screen on the boards, lots of inter-board connections with cables soldered to the boards instead of connectors, heavy shieldings that are soldered to the boards and even worse, soldered to the chassis. But all in all the repair was an exiting exercise!
As I told you, Hameg after-sales is very helpful and very nice. They still have all the spare parts. For this reason, it is often better to buy a HAMEG used cro than an used cro of another brand. I have worked with a HM1507 for testing and maintenance of no breaks. I was not satisfied with it because it often crashed in digital mode when doing a load transfer Inverter / mains. I have an HM1505. It looks like the HM1507 but analog only.
But I prefer the older HAMEG cro's. The hm605 is very good, maybe the best. The HM1005 is also very good, but it has no component tester, which is a serious shortcoming.
In my opinion, it would be the best if he had a component tester. And now, enjoy your HM1507.
NB: The BAQ34 could be replaced by a LL4148 without any problem. Hello, I recently got one of these Hameg 1507-3.
I got it for free and I'm not expert in oscilloscopes, I will rarely use it. But looks like mine doesn't work properly, I don't know if the settings causing this problem or it's something faulty. The thing is, when I turn on the device, it doesn't show any logo or anything(software, hardware verison). All the LEDs light up perfectly, everything starts up normally but the screen. I can even use normally i plugged in some switch and tried it running and shows everything perfectly. But non of the stuff in black boxes doesn't show.
Anyone experienced trouble like this or know the solution? Sorry for posting here.
Hameg Hm6042
Maybe it has never been made in English, since it's not at Hameg's website.What did Hameg say when you contated them?I suppose you have contated them before you ask for help here.You can also try to ask in Hameg's own forum: h.p://www.hameg.de/en/support/forum/index.phpthey said that the english pdv version is not available.even the german version was uploaded on their site a month ago.strange firm.very good products but a lack of otions for them:(but there is an english hard copy.and hopefuly someoane had scan it.i hope:(. What is so hard to understand?they didnt have the scaned version and they will not scan it for me,for you or for other person.why in the last 3 post i have to give you explination about why i cn`t have it?i have tried all methods.the help from someone from electroda remain the last option.so please, if someone has a hard copy and is willing to scan it or has already a scaned version contact me or upload it here.thank you for your timeand please.do not post here asking me question about why i can`t get it post only a solution for this problem:(.