Memphis ca150

mike49504 · 11th September 2010, 09:29 PM

I replaced the power supply in this amp.

New fets,and drivers. Gate resistors all checked good.

When i power it up it idles fine.

As soon as i try plugging the rca jacks into the amp it will draw excessive current.

Any ideas on what to check?

Perry Babin · 11th September 2010, 11:27 PM

How much DC is on the RCA shield?

Place the black meter probe on the amplifier's ground terminal.

mike49504 · 11th September 2010, 11:41 PM

There is 13.84 volts on the rca jacks

Perry Babin · 12th September 2010, 01:41 AM

It appears that the transformer is shorted. You'll need to use the current limiting resistor to find the short (like you did last time).

mike49504 · 12th September 2010, 02:08 AM

Thanks Perry,

Just before u posted thats what i checked and found the short in the transformer and fixed the problem .

Amp works great now.

glen65 · 12th September 2010, 02:25 AM

Quote:

Originally Posted by mike49504

Thanks Perry,

Just before u posted thats what i checked and found the short in the transformer and fixed the problem .

Amp works great now.

How did you fix the transformer?

11th September 2010, 09:29 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Memphis ca150 I replaced the power supply in this amp. New fets,and drivers. Gate resistors all checked good. When i power it up it idles fine. As soon as i try plugging the rca jacks into the amp it will draw excessive current. Any ideas on what to check?

11th September 2010, 11:27 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	How much DC is on the RCA shield? Place the black meter probe on the amplifier's ground terminal. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th September 2010, 01:41 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It appears that the transformer is shorted. You'll need to use the current limiting resistor to find the short (like you did last time). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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11th September 2010, 11:41 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	There is 13.84 volts on the rca jacks

12th September 2010, 02:08 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	Thanks Perry, Just before u posted thats what i checked and found the short in the transformer and fixed the problem . Amp works great now.

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