Showing posts with label HM203-7. Show all posts
Showing posts with label HM203-7. Show all posts

Sunday, 6 September 2015

Hameg M203-6 Repair: Jobsa Good'un - VB#5

So I finally fixed it! MINT!

So the opto had gone bad! its very strange how one day its ok and the next its just not working and all because that opto thought: "nah, not today chief, I'm retired!"

I do burble on a bit about high voltage supplies and my experience with them in this vid so, feel free to spool through, but I'm not implying that you should let your guard down when probing high voltage.

Any way I haven't really got anything else to video coming up, so this may be it for a while.

I think in October I might see if I can go mud plugging, pay and play, so I may post a video just showing some off-road footage. See who's open and fancies a play.

In the mean time, I will post up what I did to convert that torch to LED from filament, it isn't neat, it isn't cutting edge, but it will make your charge go further, which is a blessing when your stuck under a vehicle on dark winter nights.

Stay safe, observe care, and keep your peepers on m'blog!

Cheers!

Monday, 17 August 2015

Busted HM203-6 - VB#2

So this would probably be my second video blog, hooray!
So I hooked up my scope a few days ago and it worked, nice trace appeared. Next day I plugged in some probes I got donated to me, and nothing, sweet FA!

I my haste, I admit, I didn't note down the scope model number. I thought it was a HM203-7 from pictures I searched for, but then realised it was a HM203-6 - DOH!

I noticed after some of the connector numbers did not match those on the schematics!

With the correct schematics in hand, I set about looking at a few high voltage lines - why the high voltage lines? Well I was getting no display yet I was getting the trigger LED to light when I put in the test signal on channel 1, which lead me to suspect the tube was not displaying the signal yet the triggering system was seeing the signal.

I LIKE TO MAKE CLEAR, THERE ARES SOME PRETTY NASTY VOLTAGES THAT WILL BELT YOU IF YOU ARE NOT CAREFUL OR ARE INEXPERIENCED - TAKE CARE OR DO NOT UNDERTAKE IF YOU DON'T FEEL CONFIDENT!

Here are links to relevant things:
Hameg HM203-7 service manual
Hameg HM203-6 service manual
EEVblog forum post