开云体育

If you want to kill your liver, soak your hands in MEK. Acetone and lacquer thinner are just as bad. All can be very destructive on components. A considerable time ago when I was frequently reverse

I would second all of the suggestions to obtain a new supply... But, for forensic purposes, and because it has not yet been mentioned, I have heard of Methylene Chloride being used in de-potting.

Jim Mcvein, do you have any news for me in relation to 52.5 MHz crystal? I am in Italy, if you give me your bank details and the amount I have to pay for the crystal and the shipping costs, I will

On Thu, Dec 31, 2020 at 03:12 PM, Larry McDavid wrote: > > Anyone interested in buying sets of boards to share? > > Larry > Show quoted text ( #quoted-178120155 ) > > On 12/31/2020 11:27 AM, Jared

I was mistaken to say Media Rate mail does not have tracking numbers. I just looked at the 84 inch (2.13m) long receipt I received and discovered that each of the 72 packages I mailed does have a

Wouldn't my idea of bringing the connections separately to the front panel solve this? Continuity between each end of each 25 VAC winding could be tested without the mainframe being powered up. Colin.

During the early days of satellite video descrambler hacking (Videocypher module) a friend of mine was quite active doing this work and it entailed replacing a chip that I think was a 27xx ROM. At

Does that include checking that the floating AC windings are really floating ? I have had a TM503 with one end of one of the windings in one compartment shorted to ground. Voltages looked OK but the

Tha me to all, I have not had the opportunity to review any of the literature or watch the video. I appreciate everyone filling in the blanks for me! -- Michael Lynch Dardanelle, AR

I should perhaps point out that since there are 12 connections on each of two sides of the backplane connectors that someone might want to gain access to, it is very easy to run out of space on the

If anyone else needs some more info on what the tester was intended to do when Tektronix came up with the idea, it is useful to check out Tekwiki (https://w140.com/tekwiki/wiki/067-1201-99), as indeed

Some time ago I had similar thoughts on accessing the connections to the pass transistors, as well as accessing the 25 VAC connections. I had a problem on one of my TM50X mainframes with one of these

Yep, the mainframe tester tests for short/leakage and beta, along with the DC and AC voltages, and phasing of the two floating AC windings.

Hi Larry, I might well be interested in a board set, so long as the cost and shipping to London, UK aren't too crazy. I have been intending to build one of these testers for a while and have a few of

Yes, These will cause a cascade of failures with certain modules. I always try to at least diode check those pass transistors before inserting any module or powering up. So your Mainframe tester

The trick is a bad pass transistor can quickly kill a module, which can then go on to kill another slot in the mainframe, etc etc. Using a module (that isn't the purpose built tester) to test the

I just used a prototype board and brought the pins out. I am sure that the traces on a dead plug in could be isolated and used as well. I find that many of the transistors read lower gain than

Ok, Thanks Chuck.

Hi all Quite a lot of years ago there was a topic posted here that went on for some time but never reached any conclusion as to the cause of the problem...unfortunately the exact problem I think I'm

It is a cute little scope, but very low bandwidth, something like 10MHz. Its HV transformer suffers from the epoxy disease that affects 547 scopes. They are quiet, not having a fan, and the plugins