Akai AM-37 problems - distorted sound - diyAudio
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Old 20th August 2010, 09:40 PM   #1
dovilis is offline dovilis  Lithuania
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Join Date: Aug 2006
Default 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
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Old 21st August 2010, 12:46 AM   #2
jaycee is offline jaycee  United Kingdom
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Location: Norwich, UK
Service manual here: AKAI AM-37 47 audio.pdf - 4shared.com - document sharing - download

First check, DC offset at the speaker terminals.
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Old 21st August 2010, 07:58 AM   #3
dovilis is offline dovilis  Lithuania
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Join Date: Aug 2006
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?
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Old 21st August 2010, 05:34 PM   #4
dovilis is offline dovilis  Lithuania
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Join Date: Aug 2006
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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