Removing A/D converters from obsolete machine

dda · 8th October 2005, 08:50 AM

I got a hold of a Magneto Optical Disk Recorder (AKAI DD1000). It seems to be a very obsolete format and the machine actually doesn't seem to work. Someone told me that the A/D converters are pretty good, though. So, I'm wondering if anyone would be able to tell me if it would be possible, or how difficult it would be for someone like myself, who doesn't have alot of experience with electronics, to remove the the A/D converters and make a sort of home made stand alone unit. Any suggestions? Has anyone ever done something similar? Or is what I'm asking impossible?

Thanks,

DDA

rfbrw · 8th October 2005, 10:39 AM

Quote:

Originally posted by dda
I got a hold of a Magneto Optical Disk Recorder (AKAI DD1000). It seems to be a very obsolete format and the machine actually doesn't seem to work. Someone told me that the A/D converters are pretty good, though. So, I'm wondering if anyone would be able to tell me if it would be possible, or how difficult it would be for someone like myself, who doesn't have alot of experience with electronics, to remove the the A/D converters and make a sort of home made stand alone unit. Any suggestions? Has anyone ever done something similar? Or is what I'm asking impossible?

Thanks,

DDA

1. Do you have the service manual or at least a schematic ?
2. Do you know the part number of the A/D chip(s)?

dda · 10th October 2005, 12:23 AM

I have a manual, but it isn't a service manual. Just an operators manual.

As far as the chip #, I tried opening it up to see if I could figure it out, but wasn't obvious to me where the A/D converter chip would be.

rfbrw · 10th October 2005, 02:15 AM

Perhaps you could post some pictures or else try following the circuit from the analogue inputs and see where that leads.

dda · 10th October 2005, 12:19 PM

Could this be it? I'm sorry, the picture is terrible. I only have my phone to take pictures with. This is what is marked on the chip pictures:

ASAHI KASEI
AK5326-VP
9003JHR

rfbrw · 10th October 2005, 01:53 PM

The AK5326 sounds about right. It's a fairly old dac but if you like its sound I suppose that does not matter.
What does matter is what you intend to record on. You may need to add a reference input or output. If the DD1000 does not already have a digital output things are going to get quite involved. Back to the AK5326. Connected to pin23 should be a clock signal. Look around and see if there is some kind of metal can with a frequency printed on it. It could be anything between 11 and 33 MHz.

rfbrw · 10th October 2005, 02:07 PM

Looking at the picture, it appears the AK5326 is in a socket. In that case it might well be easier to build a new ADC, salvaging as many parts as possible from the DD1000 rather than adding parts to the original case.

dda · 10th October 2005, 05:59 PM

Yeah. Actually I don't really know if the thing sounds good. The person who owned it before me said it did. I think it was a high end machine for it's time.

Anyhow,
It does have a digital out (AES/EBU). And you are right the AK5326 is in a socket and pulls out. How are the pins numbered? How do I find pin 23?

Didn't see any metal can with a frequency marked on it.

rfbrw · 10th October 2005, 06:46 PM

If it has a digital output then you have three choices, use it as is, using the digital output, add a reference input or salvage the parts and build an ADC from scratch.

Re the clock. You can identify pin one by either a dot or a dimple in one corner or a u-shaped notch on the ic package. Pin 1 will be to the left of the notch with pin28 to the right. Also look out for the AES/EBU chip as well.It may be a CS8402 or a CX or a TC something.

dda · 12th October 2005, 08:45 PM

Re: the three possibilities

1) Using it as is: Seeing as the machine doesn't work, would that be possible?

2) Adding a reference input: Not sure I know what you mean by that

3) Building from scratch

Re: the clock

I think I managed to find pin 23 and follow it's path. It seems to be connected to a component which I cannot identify (forgive my inexperience). It is marked FL10 on the circuit board. On the component itself, the only thing I can read is: 100V. It has three pins.
The other end of this comonent is connected to a chip marked:
HD74HC14P

I think the AES/EBU chip might be this: TDK CIT0723DIP-340B

Does that seem right?

By the way thanks for all your help. I appreciate it.

Didier

8th October 2005, 08:50 AM	#1
dda diyAudio Member Join Date: Oct 2005	Removing A/D converters from obsolete machine I got a hold of a Magneto Optical Disk Recorder (AKAI DD1000). It seems to be a very obsolete format and the machine actually doesn't seem to work. Someone told me that the A/D converters are pretty good, though. So, I'm wondering if anyone would be able to tell me if it would be possible, or how difficult it would be for someone like myself, who doesn't have alot of experience with electronics, to remove the the A/D converters and make a sort of home made stand alone unit. Any suggestions? Has anyone ever done something similar? Or is what I'm asking impossible? Thanks, DDA

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10th October 2005, 12:23 AM	#3
dda diyAudio Member Join Date: Oct 2005	I have a manual, but it isn't a service manual. Just an operators manual. As far as the chip #, I tried opening it up to see if I could figure it out, but wasn't obvious to me where the A/D converter chip would be.

10th October 2005, 02:15 AM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Perhaps you could post some pictures or else try following the circuit from the analogue inputs and see where that leads.

10th October 2005, 01:53 PM	#6
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	The AK5326 sounds about right. It's a fairly old dac but if you like its sound I suppose that does not matter. What does matter is what you intend to record on. You may need to add a reference input or output. If the DD1000 does not already have a digital output things are going to get quite involved. Back to the AK5326. Connected to pin23 should be a clock signal. Look around and see if there is some kind of metal can with a frequency printed on it. It could be anything between 11 and 33 MHz.

10th October 2005, 02:07 PM	#7
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Looking at the picture, it appears the AK5326 is in a socket. In that case it might well be easier to build a new ADC, salvaging as many parts as possible from the DD1000 rather than adding parts to the original case.

10th October 2005, 05:59 PM	#8
dda diyAudio Member Join Date: Oct 2005	Yeah. Actually I don't really know if the thing sounds good. The person who owned it before me said it did. I think it was a high end machine for it's time. Anyhow, It does have a digital out (AES/EBU). And you are right the AK5326 is in a socket and pulls out. How are the pins numbered? How do I find pin 23? Didn't see any metal can with a frequency marked on it.

10th October 2005, 06:46 PM	#9
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	If it has a digital output then you have three choices, use it as is, using the digital output, add a reference input or salvage the parts and build an ADC from scratch. Re the clock. You can identify pin one by either a dot or a dimple in one corner or a u-shaped notch on the ic package. Pin 1 will be to the left of the notch with pin28 to the right. Also look out for the AES/EBU chip as well.It may be a CS8402 or a CX or a TC something.

12th October 2005, 08:45 PM	#10
dda diyAudio Member Join Date: Oct 2005	Re: the three possibilities 1) Using it as is: Seeing as the machine doesn't work, would that be possible? 2) Adding a reference input: Not sure I know what you mean by that 3) Building from scratch Re: the clock I think I managed to find pin 23 and follow it's path. It seems to be connected to a component which I cannot identify (forgive my inexperience). It is marked FL10 on the circuit board. On the component itself, the only thing I can read is: 100V. It has three pins. The other end of this comonent is connected to a chip marked: HD74HC14P I think the AES/EBU chip might be this: TDK CIT0723DIP-340B Does that seem right? By the way thanks for all your help. I appreciate it. Didier

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