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Old 27th November 2005, 12:59 PM   #101
Mick_F is offline Mick_F  Germany
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Difficult, yes. But not impossible.

Just to give you a scale: The diameter of the wire is 0.3mm, the diameter of the caps is 3mm.

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Old 27th November 2005, 01:15 PM   #102
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I look at your pics and the 4 pins on the right of the chip are unused.

Since AVM is compatible with B, it would mean that pins 1-10 are the good ones on the datasheet and that 11-20 are 15-24.

They also state that the pin 4 has a function with the AVM but not the B.

So here should be the pinout if I'm right:
1. TST1
2. DVDD
3. DVSS
4. /PB
5. /RST
6. MCLK
7. CKS
8. BICK
9. SDATA
10. LRCK
11. NC
12. NC
13. NC
14. NC
15. AOUTR
16. AOUTL
17. VCOM
18. AVDD
19. AVSS
20. NC
21. NC
22. VREFH
23. VREFL
24. DZF
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Old 27th November 2005, 01:43 PM   #103
jives11 is offline jives11  Europe
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Default Wow

Quote:
Originally posted by Mick_F
Difficult, yes. But not impossible.

Just to give you a scale: The diameter of the wire is 0.3mm, the diameter of the caps is 3mm.


WOW Mick. So apart from Photography, you build nanobots by hand as well ? As my dad used to say " it takes a steady hand to split the atom".

So .... is it worth it? Was there much improvement ? My experience with an old CD104 philips player was that these caps did make a big difference to the sound.
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Old 27th November 2005, 02:05 PM   #104
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But now that I look at it, there are connections to pins 11-14...

I also found a soldering joint between pins 8-9.

What's strange is that in the scheme part here:
http://www.diyaudio.com/forums/showt...749#post774749
There is no connection to a lot of them. So I guess my pinout is OK. Maybe the NC pins are grounded?

Quote:
Mick_F's photos are fantastic BUT larger than life
Just look at mine, my mobo has a lot of scratches. A capacitor on my pic is larger than the transformer alone.


Mick, your pics are fantastic! They look real! (Compared to mine)
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Old 27th November 2005, 03:29 PM   #105
jives11 is offline jives11  Europe
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I think I can see an X-wing fighter begining it's attack run
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Old 27th November 2005, 03:41 PM   #106
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Quote:
I think I can see an X-wing fighter begining it's attack run
Hehehe.


The solder joint between the two pins are I2S signals...
It works even if both are connected together. But maybe that's why I have to restart the PSX a couple of times to get sound.

Anyways, I have to get a new transport to make it work.

I don't want to modify it too much before other people do because I don't want to break it as I bought for 35$ /w shipping and I have to add an other 20$USD+ 20$ shipping for the transport.

Some people here get a working 100x + 2 controllers + memory card + remote for 25$!

I just have a 1001 /w one factory controller that will cost an other 50$ to make it work.
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Old 27th November 2005, 04:25 PM   #107
Mick_F is offline Mick_F  Germany
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Default Re: Wow

Quote:
Originally posted by jives11



WOW Mick. So apart from Photography, you build nanobots by hand as well ? As my dad used to say " it takes a steady hand to split the atom".

So .... is it worth it? Was there much improvement ? My experience with an old CD104 philips player was that these caps did make a big difference to the sound.

It was not that much work. I used a small solder tip and the whole job took about 15 minutes. It is fully reversible also.

I did this on a spare board (the one that I fried). I do not intend to run it like this, as I dont have input caps on my amp.

Mick
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Old 27th November 2005, 04:30 PM   #108
Mick_F is offline Mick_F  Germany
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I found a German site, where it is claimed that the second pair of caps in the line are C423 and 424.

Look at this image

I verified the connection between pins 15 and 16 and the solder points at the first set of caps. Hmmmmm.....

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Old 27th November 2005, 05:34 PM   #109
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The DAC output is connected to both. I checked with my dmm. You can see it too.

I'm currently checking while writing. What I can see is that there is a non-amplified circuit to the A/V jack and a circuit using an opamp to the RCA jacks. These all start by a cap and are connected in parallel from the DAC outputs.

I'm checking while writing and the first pair is going directly to the opamp. Also, the third pair of caps is connected thru some resistors to the RCA jacks.

The second pair is
cap output going to
100 ohm to ground in parallel to 1k ohm going to
100 ohm to A/V jack in parallel with transistor

The circuit of the second pair is the one from the scheme here:
http://www.diyaudio.com/forums/showt...749#post774749

The circuit is not pretty interesting for us with the 100x ones as we are using the opamp circuit. At the same time, there are muting transistors also there.


If anyone wants, I can compare the A/V out with the RCA output as I have the A/V cable.

So: mods to try, disconnect the second pair of caps as it's unused, and short the first and third pairs of caps.

I can try to come with a scheme if people want.
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Old 27th November 2005, 06:18 PM   #110
back is offline back  Greece
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i just finished bypassing the caps.
there is big improvement do your best guys.

it sounds more detailed and more musical
a lot more.

and check out one thing.

my ps1 is the scph 5502.
i may be just lucky but i bypassed them under the pcb.

only the akm is surface mounted on my not the caps.

it was hard to find the points under the pcb but i did.

look carefully and triple check with the multimeter.

maybe it`s because of the model but give it a try.
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