Morris,
UGH that complicates things. There is a problem with R180 that is quite unique to the 284, the tunnel Diode is not much to worry about, It will lift out easy with a pair of tweesers. The main issue there is the lead from R180 friction fits in to the center pin of the GR connector. It is NOT soldered in to place on one side. Not a huge deal except that the diameter of the leads has shrunk and a modern equivalent will be loose in the socket. The top side is no big deal as it is soldered. Rebuilding the air line is not a huge deal just fiddly to get everything to match up. I needed to adjust the springs in mine as well as refresh the solder on the back terminator due to age and a slight touch of corrosion. The springs has fatigued a little. This important part is D180. I have found a place to buy them if you need a replacement but they are $250.00 EACH! At least that was the quote I got from the manufacturer a few years ago.
Zen
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-----Original Message-----
From:
[email protected] <
[email protected]> On Behalf Of Morris Odell
Sent: Sunday, January 16, 2022 3:08 AM
To:
[email protected]Subject: Re: [TekScopes] Type 284 pulse generator again
Hi Zen,
Thanks very much for this advice. R184B&C should total 660 and in my unit have drifted up by about 20 ohms. The biggest drift unfortunately is in R180 which should be 750 but is actually 802. That's the one that feeds the positive pulse to the TD so replacing it involves disturbing the TD in its mount.
After my initial post I tried shorting the two 39 ohm resistors on the board and that worked very well too but I'd like to restore the unit properly.
Regards,
Morris
