Checking a transformer?

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Check _all_ of the secondary windings, and check the resistance of
the primary.  If any of them are infinite, that winding\'s open and
you have a bad transformer.

I have often found a FUSE or Thermal Link buried in the first layer or winding, check for an Open winding on the primary side due to an open link or fuse before replacing the transformer . Check for a shorted diode or filter Capacitor as the cause of the open link.

Yukio YANO

did you check the input of the transformer? many have thermo protection wrapped up inside that just dont reset some times, give it a wack! it may help.

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Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

"Jamie"

** Thermal protection *fuses* fitted inside transformers are almost never the self re-setting kind.

Like other fuses, they offer one time operation only.

........ Phil

well i have an amp sitting here in the shop that does have a reset able thermo breaker in the xformer and it now does not reset properly any more due to client not keeping the cabinets clean out and causing lots of heat build up. the unit also has fuses. this is one of a few in a rack at a bowling alley stuck back where they clean the shoe's, they get dust bunnies piles in the back of the rack once a week. those units were not designed to be tripped that often

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Real Programmers Do things like this.
http://webpages.charter.net/jamie_5