Re: Tektronix 492BP
It's not a question of them being set incorrectly, it's a question of whether their contacts actually match their settings.toggle quoted messageShow quoted text
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