Almost all of my Model 100s (around 8 or so) need to have all of the
electrolytics replaced. For some reason, they started leaking and
causing a problem with desoldering the bad parts. Upon close
examination, the leaking caps can be detected relatively easily. Some
information I saw somewhere indicated that the Chinese caps are the
worst offenders... they stole the formula but apparently "modified" it
slightly ending up with future problems.
Some of this information falls into the "I don't know what I don't know"
catagory. Nice having the tremendous volume of knowledge here to help out!
Marvin
On 8/28/2019 6:59 AM, Peter Cetinski wrote:
On Aug 28, 2019, at 9:34 AM, Marvin Johnston via cctalk <cctalk@classiccmp.org>
wrote:
Thanks everyone for the feedback... I had no idea. I'll be putting in an order
today with Digi-key (P/N 399-7483-ND) for probably around 25+ caps or so since
I have at least that many TRS-80 2s, 3s, 4s.
I guess my only question is are there other similar caps that also need to be
replaced? I'm well aware of the electrolytics and have that project on the back
burner right now (about 10 Model 100s to repair.) It is nice that they are
pretty trivial to replace!
Marvin
I’ve had very few problems with electrolytics in the many TRS-80s I’ve worked
on. It seems to be one of the places where Tandy did not cheap out. There are
some tantalum capacitors to be found in TRS-80s. These have a tendency to fail
to short so I am wary of them but still, I would probably not replace any
unless they failed.
