Akai 4000DS MkII repair

df_genius · 23rd May 2006, 01:32 PM

Hello,

I am trying to ressurrect one of these. It is in excellent mechanical order and plays back very well, the heads are in good order.

Recording was poor and sounded very unstable at high frequencies - not flutter but it seems like the bias is not right.

However, after re-aligning the heads and adjusting playback, record level and record bias current, it still wouldn't come up to spec, only managing to record 5K to -5db on R ang -7db on L with a 0db input. Next day I thought I would continue my testing and the two 400mA fuses for the main boards have blown.

I have downloaded the service manual for the MkII but the bias and rec/play boards in the manual have different part numbers to my deck.

Any ideas someone please?

David

EC8010 · 24th May 2006, 11:37 AM

Bin it. If you want to use 1/4" there are any number of professional machines available for peanuts that will eat a 4000D for dinner. Ask a local broadcaster and they may even give you a Studer. Perhaps offer a donation to a charity of their choice (they're not usually geared up for small sales).

anatech · 26th May 2006, 03:05 AM

I agree with EC8010.

It uses glass heads, they just don't look worn. The surface gets wavey and the gaps do tend to chip wider. They also overload very easily. So even with new heads, do not expect it to sound good.

A Revox A-77 with a "butter" head will kill your Akai for sound. So will a Teac A3300 or anything else they make.

Sorry for the bad news. It sounds like you've already spent some time on it.

-Chris

23rd May 2006, 01:32 PM	#1
df_genius diyAudio Member Join Date: Mar 2006 Location: Sheffield, England	Akai 4000DS MkII repair Hello, I am trying to ressurrect one of these. It is in excellent mechanical order and plays back very well, the heads are in good order. Recording was poor and sounded very unstable at high frequencies - not flutter but it seems like the bias is not right. However, after re-aligning the heads and adjusting playback, record level and record bias current, it still wouldn't come up to spec, only managing to record 5K to -5db on R ang -7db on L with a 0db input. Next day I thought I would continue my testing and the two 400mA fuses for the main boards have blown. I have downloaded the service manual for the MkII but the bias and rec/play boards in the manual have different part numbers to my deck. Any ideas someone please? David

24th May 2006, 11:37 AM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Bin it. If you want to use 1/4" there are any number of professional machines available for peanuts that will eat a 4000D for dinner. Ask a local broadcaster and they may even give you a Studer. Perhaps offer a donation to a charity of their choice (they're not usually geared up for small sales). __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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26th May 2006, 03:05 AM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	I agree with EC8010. It uses glass heads, they just don't look worn. The surface gets wavey and the gaps do tend to chip wider. They also overload very easily. So even with new heads, do not expect it to sound good. A Revox A-77 with a "butter" head will kill your Akai for sound. So will a Teac A3300 or anything else they make. Sorry for the bad news. It sounds like you've already spent some time on it. -Chris

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