Re: Tektronix 2215, pulsing/chirping noise, no trace.

tekscopegroup@...
 

Good thing you where already able to isolate the fault to the pre-regulator, which should make for a much easier fix. This should always be one of the first steps to take with power supply problems in the 22xx series. Now you need to check every part on that pre-reg stage, specially all the semiconductors, but also look for possibly dried out elco caps before you do any further power up tests as you might burn up recently replaced components if there are still other faults that have not been fixed. I assume you already have the full service manual, otherwise definitively get one first before going in any deeper. Send in your updates with any additional findings, and good luck with the troubleshooting.

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