Akai AM-37 problems - distorted sound

dovilis · 20th August 2010, 08:40 PM

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?

20th August 2010, 08:40 PM	#1
dovilis diyAudio Member Join Date: Aug 2006	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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20th August 2010, 11:46 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 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.

21st August 2010, 06:58 AM	#3
dovilis diyAudio Member 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?

21st August 2010, 04:34 PM	#4
dovilis diyAudio Member 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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