Help to repair oscilloscope Philips PM3207 (Algemeen)

door edison , Aveiro - Portugal, 07-11-2020, 17:59 (1269 dagen geleden) @ Onno-I

Hi Onno,
i know i can't test these diodes with the DVM, because that i put news. Not the BY409A but the equivalent BY713.
I did the test that Maurice said but I didn't get any HT signal.
these are the photos of the waveforms.

After that, i removed the transformer and made the circuit on a test board and
did not get any HT signal.

When I put the 30kHz signal the light bulb turns on.

--
From PORTUGAL, with regards
Carlos