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-   -   Akai AM-37 problems - distorted sound (http://www.diyaudio.com/forums/solid-state/172241-akai-am-37-problems-distorted-sound.html)

dovilis 20th August 2010 08:40 PM

Akai AM-37 problems - distorted sound
 
Hi,

I've been using AKAI AM-37 for couple of years and recently started to notice that the sound becomes distorted more and more. Today I wanted to record some LPs to a reel and the sound became quite terrible. I can understand the music but it sounds now distorted. First thought it was a stylus but then changed to CD input and tried to play a CD - nothing changed.

Really do not know where to start looking. Can it be a power supply or transistors? Or maybe something else to look at?

Can someone show me the right path what to look for?

Cheers

jaycee 20th August 2010 11:46 PM

Service manual here: AKAI AM-37 47 audio.pdf - 4shared.com - document sharing - download

First check, DC offset at the speaker terminals.

dovilis 21st August 2010 06:58 AM

Thanks for the manual. Really appreciate it!

About DC offset... I have read on some page how to measure it.

Nothing connected to amp showes me jumping voltage from 100 to 400mV, if volume is turned out it sais about 2-3mV

Do I measure the right way?

dovilis 21st August 2010 04:34 PM

Hey again,

i did some mistake.... I didn't fastened contact from multimeter well and did bad readings.

Now, measuring right channel the readings without any input from 100 to 2000mv and sometimes more. Left is OK I think, it showes 4-5mV constantly, and tries to handle it even if i turning volume UP.

Can there be a problem on right channel capasitor of 6800uF?


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