Won't power up at all

Hi I just checked the primary winding on two transformers for u one was 13 ohm the other 21 ohm for 240 volt power supply Sounds like u have a shorted turn on the primary winding. Hope this helps

You have a bad transformer. It may be the capacitor, but i,m thinking the transformer.

The main fuse has blown, or the power transformer has a open primary, one or too audio outputs semiconductors have shorted. To narrow it down the top needs to be removed and unplugged, set digital meter to ohms and check fuses, next! the too wires going into the transformer should have a low reading, but if it reads infinity or open the primary side of the transformer is open.

This is fairly straight forward---if it got the fuse, input filter (big cap!) and the fuseable 7 watt-----

Understand (I do not know how savy you are) the power supply uses two grounds----on the primary side of the transformer (in power supply) it is from earth ground and on the secondary side from hot ground--when checking voltages= these are the key! you have to be on the correct ground to get correct readings.

Follow the money---the primary raw should be on that cap---follow it to see when it stops downstream.

220 can pop a lot of things---the set should also have a regulator IC in the power supply (could also be a big transistor) and if a chip--raw from that cap goes into it---and regulated comes out another pin---see if you have the raw and then see if at horizontal output collector and from there to flyback( with set off what is resistance reading from the collector of the output transistor to earth ground?

what kind of experience do you have with troubleshooting?

you could just have dead cell in the battery which isn't getting enough amps to the starter,, have the battery LOAD checked,, that will tell you if the battery is actually good, just because it registers 12 volts isn't necessarily an indication that the required amps are present.

This is NOT a forum for college problem solutions. How would you have a 20 KVA transformer and an Atlas Sound AF140... these are different animals... Autotransformer is a more efficient connection when it is possible... the transformer will step the 220 up to 2200+220 volts ignoring the copper loss voltage. For proper designed transformers the primary and secondary copper losses should be close to equal... but in autotransformer connection the efficiency is improved as the added voltage of the supply going to the high voltage winding power does NOT suffer and add to the current required in the primary of this connection. The purpose of this problem is for you to discover that the efficiency of autoformer connection is higher than of a simple step up connection. Now with this carefully work the problem... The ratio I have all but given you... It is unclear what is considered full load here so I would base it on regular connection at 20 KVA at 2200 volts to calculate what the currents would be primary and secondary.in normal connection... calculate resistance of primary and secondary ASSUMING equal losses primary and secondary. What isn't clear is if the loss figures are for the autoformer connection OR just the specs for normal connection. The power factor kink adds to the misery. Approach this problem by making an equivalent circuit of the transformer showing the primary and secondary resistances... again the question is are the loss figures the specs of the transformer or the actual running values for the system....

Turn the thermostat to off and check for 24vac between R and C or R and Y. If you don't have it then locate the transformer and check for power on the transformer primary side (120vac). If you don't have power on the primary side, check for a tripped breaker or blown fuse. If you do have it then the transformer is bad. You can confirm that by measuring the resistance of the secondary side of the transformer.

tell nintendo

Hi radek

If it is a toroidal,they have a nasty habit of going shorted turns on the primary. Is it blowing fuses? Let me know

robotek
ex In'gill ;)

Make shure with an ohm meter that the primary and secondary windings have very little resistance on the main trasformer,then check voltage in trasformer and out from transformer...BIGRED