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I've had the same experience as John, and not only with Tek's instruments. HP gear of that period also seems to suffer from the same affliction. That likely implies that you'd find this in the products of other manufacturers as well.
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford, CA 94305-4070http://www-smirc.stanford.edu
On 1/14/2021 11:27, John Miles wrote:
It's not a question of them being set incorrectly, it's a question of whether their contacts actually match their settings.
The DIP switches used by Tek in this era are extremely failure-prone due to aging. But normally they are OK until they're toggled on or off for the first time in 20+ years. You can rule out the switches by checking them with an ohmmeter to see if the ones that are in the 'OPEN' position are actually open (i.e., med/high resistance across the contacts.) Likewise for the others, with ~0 ohms expected across the contacts for the switches that are closed.
-- john, KE5FX
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Sent: Thursday, January 14, 2021 8:54 AM
Subject: Re: [TekScopes] Tektronix 492BP
The only boards with dip switches are the memory board and the vertical
digital storage board. I have no idea which ones supposed to be on or off.