power supply has to many volts coming out

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cobra974life

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where the power from the transformer is high coming out of the secondary, to board can i add a resistor to the one wire too ruduce the 48 volts its producing to mabe bring down the dc volts thats messed up
 

You used the wrong word "to". You said it has to many volts which is meaningless. You should say that it has too many volts.

Adding a resistor in series with a resistive load will waste the extra volts by heating the resistor.
But adding a resistor in series with a motor or electronic circuit will cause the motor or electronics to malfunction.
 

ok maybe you can help me to know why its putting out 48 volts when its a 30v 5a supply the fuse blue one day so i replaced it and it went straight to 48v and the knobs to control the volts dont work it burrys the gauge past what its suppost to
 

A typical 30V Power Supply Unit uses a transformer and rectifier to produce more then 30V, in your case it looks like 48V. The PSU then either has some form of electronic stabiliser to accurately reduce the 48V to 30V or it relies on the fact that as you draw current, the voltage will fall and at the rated current the output volts will be 30V. As you say that the unit does not work use a multimeter and trace where the 48V goes to, because it looks as though there is a break in the circuit.
Frank
 

Audioguru said:
We can help you fix the power supply if you post its schematic and parts list.
Click to expand...

i would but dont know how theres no schematis book on this thing its old as dirt lol
i can take pic an send it thats all i know what to do
 

Open loop or close loop application? Is there a control IC used? If it's closed loop, there must have malfunction, and please firstly check the feedback point voltage.
 

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