Hi,
Fix it and tell us about it.
How large is the ripple? Everyone seems to recommend changing the caps in the power supply. You say after warmup, then the problem starts. CAPS??
The manual is online. 2445 and 2465 are very similar. On EEVBlog, another fella is working na 2465.
Larry
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On Aug 14, 2019, at 3:04 PM, Paul Gallimore <paulmk22@...> wrote:
Hi,
I acquired a 2445A a few years back and never switched it on until now. I am now starting to look at it for the first time and there are a couple of issues, but I have no scope fixing experience. Plus it's been a while since I did any fault finding on anything truly electronic.
So, I am trying to assess whether I should sell this on Ebay (UK) as a broken item, or whether I should take a shot at fixing it up.
I have powered it up and there are no reported faults, plus the scope traces appear as they should, as well as on screen characters. However, after a warm-up period (5-10 mins) the sweep stops and I am left with just a vertical trace. Using the J119 test points I can see that the supplies all look good with a DVM, but using Pico scope (laptop based scope) I can see some ripple on the supplies. I have yet to determine whether the ripple is in spec. (Though, I know where the info for that is in the manual)
Where do you think I should start with this? Should I just do a bulk capacitor swap out an ask questions later, or are there a few particular ones I should go for?
I should also say that some of the on-screen characters seem to get corrupted after a while as well.
Any opinions on where I should go with this would be appreciated.
Thanks
Paul
