Receiver won't power up!

[buckscrape]

I have a Onkyo tx-sv515 proII, that does not power up it is an older but very good unit, is there a place I can start to look at I am somewhat knowledgable!

[buckscrape]

The problem is that when I plug the unit in, the standby light lites and when I push the power button nothing happens, any ideas?

[HayZee518]

the standby light comes off the line side of the connection wire and goes to the toggle-over switch. use a meter and verify that power is coming out of the switch in the "ON" position. Next would be to check the transformer primary.

[Cooper Day]

Most of the older audio/video units are fused internally via small buss fuses. Unplug the unit and remove the cover. You may find a single fuse, which may be blown or/and an individual fuse for each channel. I'd check these before getting more involved in other possibilities. Sometimes It's the simple things that drive you nuts! Good Luck!

[HayZee518]

trace out your circuit with a good analog meter. digitals work good with low current ICs. start at your input power to the switch to the transformer primary. look for a glass type fuse in one or both sides of the line. the line may have a thermistor across the line input for surge protection. check your output according to the unit's specs. the power supply could be a bridge rectifier or a full wave power supply with a center tap secondary. there would be two diodes connected for the positive voltage. negative would be ground. check filter capacitors next. the filter network could be a pi filter or an L filter.