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GM300 reverse polarity - no fuse.

Posted: Tue Dec 10, 2013 3:47 am
by sasabcp
Need some help. I am trying to repair a GM300 that someone has connected to a battery the wrong way around with no fuse.

This is the logic board, I can not locate the fuse that is soldered to the board. Last repairman stole TDA !
http://my.opera.com/sasabcp/albums/show ... =203014902

Printed ties are blown between the plus and diodes. I have to change the blue capacitor next to the diodes that is damaged. Which value?
http://my.opera.com/sasabcp/albums/show ... =203014912

On the other side of the same panel had some damage to the lines, I guess it's part highlighted in red burnt, it should be connected. There lacks a some resistor or capacitor that is burnt.
http://files.myopera.com/sasabcp/albums ... zadnja.jpg

Thanks in advance for any advice
Best regards and 73 de 9a7bcp.

Re: GM300 reverse polarity - no fuse.

Posted: Tue Dec 10, 2013 1:01 pm
by Will
Start here: http://www.repeater-builder.com/motorol ... part-a.pdf

There are five parts to the manual on that link.

Re: GM300 reverse polarity - no fuse.

Posted: Wed Dec 11, 2013 4:55 am
by sasabcp
TNX Will.