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ups.com...
The customer said he smelled something burning a number of times when
trying to power the set on. He says he never saw any smoke. We tried it
when it came in but there was only the sound of a relay energizing and
then dropping out about one second later. I could not locate visually
or (with my nose) where anything seemed to have burned from. I checked
the HOT and the SCR and three diodes nearby it and found them all to be
good. I repaired the troublesome coil also. I can hear the little chirp
from the power supply when you first plug the set in which leads me to
suspect that the SMPS may be good. I have seen flybacks go bad in some
of these but I don't own a ringer so I can't be certain of that. Can
anyone offer a rule out or troubleshooting procedure or perhaps an
opinion based on the symptoms I've described? Thanks for any
assistance. Lenny Stein, Barlen Electronics