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Old 28th April 2015, 02:40 AM   #1
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Join Date: Nov 2014
Default Troubleshooting a blown fuse

Hi all,

I recently replaced the belts on a previously working Akai GXC-730D cassette player. Unfortunately it seems the belts were a bit stiff to start, and after I turned the player on, it took a few seconds for the belts&wheels to start spinning... and during this time i see a tiny plume of smoke coming from the "power supply board" and smell a fine burning smell!


Inspecting the damage, I had a burnt out transistor on the power supply board, and a blown fuse going from the power supply board to the power transformer. I have already replaced the transistor, but each time i power & turn on the player, I quickly blow the fuse (1.5A) on the power transformer.


Can anyone suggest a good route to troubleshoot the problem? I opened up the power transformer to look for visual clues, but its just a giant inductor sealed up with a dozen or so wires sticking out, so i can't easily tell if anything is damaged. I have the schematic of the circuits, but it is far more complicated than any electronic circuits I've dealt with in the past. However I went to university for electrical/computer engineering so I feel like I can safely attempt it. Plus I figure any repair cost would be higher than the value of the tape deck in the first place!


Thanks!

Thomas
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Old 1st May 2015, 08:32 AM   #2
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Join Date: Jul 2003
Location: Dona paula, Goa
Download the service manual

AKAI GXC-730D SM Service Manual free download, schematics, eeprom, repair info for electronics

Gajanan Phadte
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