[Heath] IT-28 Cap Checker Problem

[Gordon Gwillim]

Hi Lin. I had a similar thing going on last year with my IT-28 and I did quite a bit of trouble shooting but if I recall correctly (didn't take notes) the symptoms responded to a anti-oxide spray on the range switch. I used GC Nu-trol, but there are quite a number of similar products that do a fine job on old switches with oxidation on the metal elements.  There could indeed be other causes for your symptoms but the switch treatment worked for me. Keep us posted. 73
Gordon VE5UJ


________________________________
 From: "digital-conjurers at roadrunner.com" <digital-conjurers at roadrunner.com>
To: heath at puck.nether.net 
Sent: Thursday, March 29, 2012 9:52:02 AM
Subject: [Heath] IT-28 Cap Checker Problem
 
Had this thing for decades, never a problem.

Now the bridge section seems inoperable (can't get a shadow/dip on the eye tube on any type of cap), but the leakage test section still works fine.

The schematic is deceptively simple, but before I go mucking around in it, does anyone have one of these things, and has had the same problem/issue, and what was the result?

Barring this, anyone have any idea where in the circuit to start looking?

Thanks,

-Lin/KJ6EF

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