daver2
10k Member
I keep thinking of Clint Eastwood in the Dirty Harry films saying "You've got to ask yourself one question: 'Do I feel lucky?' Well, do you, punk?"
Dave
Dave
On the oscilloscope front - @Hugo Holden has recommended a Hitachi V-509 oscilloscope - and I will tell you how good that is when I open my parcel from the post man presently !
Dave
I think most would agree the way to go is the scope. Otherwise you would find yourself removing a lot of good/normal vintage IC's for no reason. Also there is a risk to the pcb unless your de-soldering tools and soldering equipment is excellent and sometimes this can introduce new faults. Also it is better to keep as many of the IC's as original as possible with their date codes etc matching the computer.Hello, friendly ping on this thread. in your opinion, is it better to buy an oscilloscope to test for bad chips or buy a chip tester and start removing them (replacing with sockets)?
For example, I bought a 4116 DRAM chip tester and it reported that twenty NOS 4116-15nl IC's were defective, when they are not and work perfectly in the computer.
I generally recommend the small Hitachi analog scopes as starters, V209 or V509 because they are super compact and don't occupy much bench space at all. The 509 has a delay time-base and is 50Mhz, the 209 is 20 MHz, both would work to help fault find a PET. The 209 is often cheaper and plentiful and at least close to $100 and infinitely better than any new digital scope at that price area. One feature is they have a very high final anode voltage for the small sized CRT at 10kv and they have a super bright trace.Wow, great info @Hugo Holden !! Thank you.
I'd like to buy an oscilloscope in advance of the article you spoke of. Can you recommend a low-cost (<$100), beginner-friendly scope? It only needs the ability to diagnose problems in the PET, nothing new or sophisticated (I'll upgrade later if needed).
I don't think it is an Arduino, I will check.It wasn't one of those ones based on an Arduino Nano, is it?
Luckily I collected a very large amount of spares for the 2465B, but still, it is upsetting when a TEk scope breaks down)