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Old 26th November 2005, 04:45 PM   #91
back is offline back  Greece
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jives 11 why don`t you just bypass them with a piece of cable
to test the sound?
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Old 26th November 2005, 09:27 PM   #92
Mick_F is offline Mick_F  Germany
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I agree with the connector pinout shown. There is just one thing I should tell you, although I am not sure what went wrong...

I once tried to make a connector with five leads (since I had a 5 pole cable and DIN connectors). I combined the three ground connections to one (2, 4, and 6) and used separate leads for 1,3,5, and 7. In principle this should work but when I connected the PS1 like this and switched it on I fried it. The mechanical parts worked but there was no sound. Later I tested everything with another PSU etc, but it remained silent, so I am sure I have irreversibly fried it.

It may be that something else went wrong, but, besides the common ground connection, it was a standard operation, which I have done before without any problems.....

I dont know what the trimmer is for.

Mick
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Old 26th November 2005, 09:57 PM   #93
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Have you triple checked that the wiring was done right?

I really don't know what could have happened as the 3 grounds are connected together on the PSU PCB.

Maybe you reversed the pins of one of the connectors?


Did the other PSU you used had the factory short cable?

What do you mean by fried? It was smelling something or it's just that there was no sound?

Maybe the cable resistance is lowering the voltage?

If there was just no sound, try the stock cable with a PSU at it's normal location. You should try a couple of times to play a disc and to power it on and off it between each trials. My 1001 often starts the disc but no sound is going out. I have to play/pause a couple of times to get some sound.
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Old 26th November 2005, 10:02 PM   #94
Mick_F is offline Mick_F  Germany
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Quote:
Originally posted by jives11


Thanks Mick_F for the output stage schematic. I'm new to surface mount and trying to figure out which is which. In my travesty of a crop of your original beautiful photo, I believe C423 & C424 are the 2 silver Cans to the right of the AKM DAC chip, they appear to have traces to pins 15 & 16. Is that correct ?

Unfortunately I only have the datasheet of the AK4309B, which has only 20 pins. But counting the pins, it seems that indeed 15 and 16 are connected to the two caps seen on your cropped image.

Does anyone of you have the 4309AVM datasheet?

Mick
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Old 26th November 2005, 10:12 PM   #95
Mick_F is offline Mick_F  Germany
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Quote:
Originally posted by DragonMaster
Have you triple checked that the wiring was done right?



I normally do so, and I am quite sure that I did then too.

Quote:

I really don't know what could have happened as the 3 grounds are connected together on the PSU PCB.
I agree! It is a mystery to me too. But I am not going to try it once again....

Quote:

Did the other PSU you used had the factory short cable?
Yes.

Quote:

What do you mean by fried? It was smelling something or it's just that there was no sound?
Immediately after powering on I heard a grumbling noisy sound. I immediately switched off and checked the wiring. I could find no errors so I switched on again. This time I heard nothing, and this remained so even after I powered it up with another PSU and the short cable.
There was no smell.

Quote:

Maybe the cable resistance is lowering the voltage?
I used a cable of about 1 m length. The leads were stranded 0.75mm. The corresponding voltage drop should be negligible.

Quote:

If there was just no sound, try the stock cable with a PSU at it's normal location. You should try a couple of times to play a disc and to power it on and off it between each trials. My 1001 often starts the disc but no sound is going out. I have to play/pause a couple of times to get some sound.
Thats what I did, but it remained dead.

Mick
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Old 26th November 2005, 10:14 PM   #96
Mick_F is offline Mick_F  Germany
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Btw, did any of you ever check the PSU output with a scope? If so, how large a ripple did you measure?

Mick
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Old 26th November 2005, 10:20 PM   #97
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Well, I can't tell anything except maybe that two wires are soldered together but I doubt about that too. Have you chechek the resistance between each pins? Maybe two little bits of shield are missing somewhere?

I don't know what could have happened but maybe something happened in the way that the wires were twisted in the cable or something.
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Old 26th November 2005, 10:27 PM   #98
jives11 is offline jives11  Europe
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Quote:
Originally posted by back
jives 11 why don`t you just bypass them with a piece of cable
to test the sound?
Thanks Back,

yes - of course you are right, I could short out the caps.

The problem is the 2 caps are surface mounts and next to each other. The board is double sided with no ways to jumper underneath.

To short out the caps I would need :

1) A better fine point soldering iron

2) Beta blocker medication to stop my shaking hands.

I could desolder the out tags and bend the caps off the board, but I need a much finer iron and more skill. My current iron wouldn't fit in the gap between the caps.

I'm extermely grateful to Mick_F for providing all of the data, but I think, on balance that I'd better stick with an unmodded PSone that works.

However the PSU would be easy to work on .....
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Old 26th November 2005, 11:45 PM   #99
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Quote:
Does anyone of you have the 4309AVM datasheet?
I just made a request to AKM for it, we'll see in a couple of days!

The 4309B is supposed to be pin-compatible so I guess that we just have to find where are the 4 unused pins.
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Old 27th November 2005, 05:21 AM   #100
back is offline back  Greece
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Quote:
Originally posted by jives11


Thanks Back,

yes - of course you are right, I could short out the caps.

The problem is the 2 caps are surface mounts and next to each other. The board is double sided with no ways to jumper underneath.

To short out the caps I would need :

1) A better fine point soldering iron

2) Beta blocker medication to stop my shaking hands.

I could desolder the out tags and bend the caps off the board, but I need a much finer iron and more skill. My current iron wouldn't fit in the gap between the caps.

I'm extermely grateful to Mick_F for providing all of the data, but I think, on balance that I'd better stick with an unmodded PSone that works.

However the PSU would be easy to work on .....
outs i didn`t like that.

my hands aren`t shaking but my solering iron
will be to big too.

i will check it out tomorow.
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