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-   -   Planet Audio ZR300.4 (http://www.diyaudio.com/forums/car-audio/167261-planet-audio-zr300-4-a.html)

o. l. t. 21st May 2010 07:52 PM

Planet Audio ZR300.4
 
Amp is not getting remote power. This amp was playing just fine and suddenly cut off. It does nothing, dead as a doornail. No amp draw, nothing. I get power all the way up to the chip on the remote input side and no further.

Ideas welcome.

http://i32.photobucket.com/albums/d5...1/94fa47c3.jpg

http://i32.photobucket.com/albums/d5...1/5fe46fe9.jpg

Perry Babin 21st May 2010 08:33 PM

It may simply be a broken connection on a component or jumper. The layout is shown on the top of the board. Follow the voltage from the remote terminal towards the 494 to see where you lose voltage.

o. l. t. 21st May 2010 08:51 PM

Quote:

Originally Posted by o. l. t. (Post 2194655)
I get power all the way up to the chip on the remote input side and no further.

Right there. Input pin 1 I suppose of the chip is where the remote power stops. It was once suggested a capacitor may be to blame since these chips rarely fail, but the idea went no further.

Perry Babin 21st May 2010 08:58 PM

Post the voltage on all 16 pins.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:

o. l. t. 22nd May 2010 10:58 PM

Hilarious, all I have is paint on this computer. Pathetic looking ain't it?

The one pin that shows 1 volt rises from zero to 1 volt over the first 30 seconds the amp is on, the others are dead except where it is marked 12 volts.


http://i32.photobucket.com/albums/d5...f/Untitled.png

Perry Babin 22nd May 2010 11:46 PM

1 Attachment(s)
I posted the list so you could copy and paste and fill in the blanks. If you don't know the pin numbering scheme, see attached.

It appears that the IC is defective or something is dragging the 5v regulated output to ground. Pin 14 is the regulated output and should have 5v on it.

As a side note... If you need a better program for drawing, download Open Office (free) and use the 'Draw' application. It's not great but it's MUCH better than paint.

o. l. t. 23rd May 2010 12:15 AM

Pin 3 has 1 volt on it, but must rise from zero over 30 seconds to get there.

Pins 8, 12, 11 all have 12 volts on them.

What part number readily available would replace that chip? That one is a booger to find.

Brain Fried 23rd May 2010 12:32 AM

Quote:

Originally Posted by o. l. t. (Post 2195697)
Pin 3 has 1 volt on it, but must rise from zero over 30 seconds to get there.

Pins 8, 12, 11 all have 12 volts on them.

What part number readily available would replace that chip? That one is a booger to find.

The TL494? i am not 100% ask perry to make sure.

Perry Babin 23rd May 2010 01:42 AM

Yes. A TL494. Mouser doesn't have the 494 but they have the 594 which is essentially identical. Click HERE.

o. l. t. 23rd May 2010 01:42 AM

TL494

If one of those will work just point to it :) I don't know all the different designations of each chip.


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