UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Akai GX4000D

WreckTangle · 10th Mar 2018, 3:13 am

A common cause of problems in these Akai decks is failure of the 2sc458 transistors. Look carefully for telltale black oxidisation on their legs. Even better if you are able to reconcile ones that have this oxidisation with their position in the left input channel on your circuit diagram.

You may find all the transistors have evidence of black leg syndrome. They only fail when the black rust gets into the can.

I used 2SC2240 as a replacement when I got my Akai out of storage and both channels had failed. I found it was just about possible to replace them without removing the circuit board, which I think is quite involved.

10th Mar 2018, 3:13 am	#3
WreckTangle Tetrode Join Date: May 2014 Location: Gloucester, Glos. UK. Posts: 71	Re: Akai GX4000D - Left Channel Repair A common cause of problems in these Akai decks is failure of the 2sc458 transistors. Look carefully for telltale black oxidisation on their legs. Even better if you are able to reconcile ones that have this oxidisation with their position in the left input channel on your circuit diagram. You may find all the transistors have evidence of black leg syndrome. They only fail when the black rust gets into the can. I used 2SC2240 as a replacement when I got my Akai out of storage and both channels had failed. I found it was just about possible to replace them without removing the circuit board, which I think is quite involved.