POWER TO THE AMP.POWER FROM THE TRANSFORMER BUT APM DOES NOT WORK?INTERNAL FUSE OK?

All microwaves has both internal thermal cut out and internal fuse, Yours problem sounds like an open 9 volts transformer that power up the front panel

If you cannot do a reset of the internal fuse system and get it operational, then check the internal battery for continuity. If they all fail, then the AC/DC transformer has blowen.

Check power supply transformer, that could be last thing before deciding to throw it away.

-SS.

NAD M15

Problem : Dead


Possible solution : Check for Power Supply

How to Test a Transformer: 7 steps - wikiHow


If these has been done,


• Check amp power supply and low voltage regulators

These includes fuses ( many of them )



Tech Center tells you how to use a multimeter .

• There could be other electronic components but try on them first.


If the torroidal transformer is OK , then it could be a problem on the

Circuit boards.

There could be a shorted components somewhere.

There's only one way to check the transformer and that's with a voltmeter. If there is mains going in but nothing coming out of the secondary, then that fuse has gone. They are not designed to be replaced and Transformers are what the trade call 'Safety Parts'. So they have to be replaced with the same thing. I would contact Teac and find out if they still do make them or where you can get one from.

It wont be fixed by friday It appears a number of components have failed in the amp If it's not the main transformer , you're looking at $200-300 for a fix

The transformer on these units contains an internal fuse that may have blown. With the unit unplugged, measure across the primary winding of the transformer. It should read low ohms. If you get infinity, the primary is open and will require replacement.

Dan

Hello sjday62

It sounds as if you have a component that has changed value enough in value to cause a high current draw, but has not completely shorted out. this phrase from you "so I did a stupid thing and bypassed the internal fuse and it turned on and worked" Not as stupid as you would think because it confirms what I said above, the 6.3 amp fuse tells me that the current draw normally is about 3 amperes since the normal rule of thumb is to double the value of the current to select the type of fuse. a five amp fuse should as well as a 4 amp fuse (it's best and recommended to use the exact fuse type). Now back to your issue. I would suspect that a transformer in the power chain has developed a shorted winding, or a capacitor begun to develop a short or excessive absorption.

I would suggest that you have the set looked at by a qualified TV technician.

I hope this helps,

Thank you,

Shuttle83

the transformer has an internal thermal fuse. If you study the terminations coming out from the internals of the transformer you may notice either a pair of tinned thicker wires or insulated. This may be open circuit. I have often bypassed this internal fuse(they are notoriously common failures) to get a transformer going. You can get a replacement one from a parts supplier if you felt the need. I would just bypass it anyway.:)This may make the amp somewhat "illegal" in the US. We use the MEN (multiple earth neutral) mains power distribution in Australia and the transformer(if melting) would short out to earth and blow the mains primary fuse, the internal thermal is a US requirement.

power down the amp totally to reset processor, then try again. If still no go, may have blown internal fuses- replace and try again
.... or failed thermal fuse in mains transformer. this is a workshop repair as it involves mains voltage that can kill :)