Akai M-10 - UK Vintage Radio Repair and Restoration Discussion Forum

john116 · 3rd Mar 2012, 4:33 am

Trying to track down a fault with an Akai M-10 reel to reel tape deck.

Seems both preamps aren't working. No needle deflection on playing a recorded tape, or trying to record a tape.

Some hiss from speakers when volume turned to full.

Service manual suggests checking B+ voltage, but the schematic is very light on with voltage details out of the power supply, so am a little stumped.

Any help greatly appreciated. I am assuming it's a power supply issue, as guess it's unlikely that both channels would have died (although not impossible).

Thanks,
John

mrmagnetophon · 3rd Mar 2012, 5:27 am

B+ voltage, its solid state, are you talking the transistor voltage?

-Chris

Michael Maurice · 3rd Mar 2012, 9:47 am

John, Can you post the schematic on here, I would think +B would be around 20V - 30V.

john116 · 3rd Mar 2012, 9:55 pm

I have a printed copy, but also available online here:

http://www.obsoletemedia.com/tapedec...l/schem2-1.htm

http://www.obsoletemedia.com/tapedec...l/schem2-2.htm

mrmagnetophon · 3rd Mar 2012, 10:18 pm

Yes the machine is solid state, B+, you mean transistor voltage.
You need to check the power supply unit and make sure that its outputting voltage.
Look at the capacitors and make sure one hasnt gone leaky.

-Chris

3rd Mar 2012, 4:33 am	#1
john116 Pentode Join Date: May 2008 Location: Sydney, Australia Posts: 156	Akai M-10 Trying to track down a fault with an Akai M-10 reel to reel tape deck. Seems both preamps aren't working. No needle deflection on playing a recorded tape, or trying to record a tape. Some hiss from speakers when volume turned to full. Service manual suggests checking B+ voltage, but the schematic is very light on with voltage details out of the power supply, so am a little stumped. Any help greatly appreciated. I am assuming it's a power supply issue, as guess it's unlikely that both channels would have died (although not impossible). Thanks, John

3rd Mar 2012, 5:27 am	#2
mrmagnetophon Retired Dormant Member Join Date: Sep 2010 Location: Ohio, USA. Posts: 757	Re: Akai M-10 B+ voltage, its solid state, are you talking the transistor voltage? -Chris

3rd Mar 2012, 9:47 am	#3
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,225	Re: Akai M-10 John, Can you post the schematic on here, I would think +B would be around 20V - 30V.

3rd Mar 2012, 9:55 pm	#4
john116 Pentode Join Date: May 2008 Location: Sydney, Australia Posts: 156	Re: Akai M-10 I have a printed copy, but also available online here: http://www.obsoletemedia.com/tapedec...l/schem2-1.htm http://www.obsoletemedia.com/tapedec...l/schem2-2.htm

3rd Mar 2012, 10:18 pm	#5
mrmagnetophon Retired Dormant Member Join Date: Sep 2010 Location: Ohio, USA. Posts: 757	Re: Akai M-10 Yes the machine is solid state, B+, you mean transistor voltage. You need to check the power supply unit and make sure that its outputting voltage. Look at the capacitors and make sure one hasnt gone leaky. -Chris