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Old 12th October 2007, 09:13 PM   #1641
jake111 is offline jake111  United States
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Old 13th October 2007, 06:30 AM   #1642
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Originally posted by jake111
which modes will improve the sound?
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Old 13th October 2007, 09:08 AM   #1643
Nanook is offline Nanook  Canada
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Default er..all of them:)

if not that handy w/soldering iron, then do as Mick suggests and use the AV cable out . Removing the player from it's enclosure does help with performance as well. I haven't built a Linear power supply for mine, but results are reportedly good.
stew -"A sane man in an insane world appears insane."
Let's help Dave and Ruth
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Old 13th October 2007, 09:24 AM   #1644
Mick_F is offline Mick_F  Germany
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The most important (audible) mods are:

- Replacement of the output stage
- Replace the SMPS by linear PSU
- Low-frequency damping

No statement here.
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Old 13th October 2007, 03:00 PM   #1645
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While I agree with Mike_F I would add that
that when I changed the output stage of
one of my 1002s I left the laser bias and gain
adjustments alone as the unit was behaving quite
well. After the output conversion I was never
really sure if I liked it as much as the Av out
until I decided to re-adjust the laser bias and
gain, The unit now sounds a lot better and seems
to be breaking in quicker and is more articulate.
Adding spiked feet and a jarrah wood base for me
was the best of all the mods and I am planning
to do the power supply sometime real soon.
I am currently adding gold RCA outputs to a
couple of 5502s and there seems a lot more
room for polypropolene caps in 5502s. I have come
to like the AV section on 5502s with 600/600 ohm
transformers but that may be just a combination
that works with the Denon receiver I have in my
bedroom. So much of the output tweaking depends on
where the signal goes next after the PS1!
I have been offered a rare SCPH5003 at a good price with a
110/240v power supply. I think it is NTSC but I hardly
ever have a display anyway. Good luck with your 1001 mods.
These early PS1 units are very rewarding.It is sad they
cheapened the later units. I hear the Wii is great for games
but has a poor audio section. Pity that skimping on sound quality
is a fact of life for Wii gamers at present.


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Old 14th October 2007, 07:51 AM   #1646
Mick_F is offline Mick_F  Germany
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I'd bet that the PS1 was not deliberately designed to have such a high quality of audio output. I think this occurred rather "by accident".
No statement here.
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Old 14th October 2007, 06:15 PM   #1647
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I agree that the good PS1 sound was likely an accident. I have another theory that appeals to me, even though it probably has little to do with reality. What if, in some obscure Japanese DAC design studio, a programmer was disgusted with the digital sound of DACs at the time and decided to make one that sounded more like analog, more like LPs, even if he had to give up some ultimate accuracy and neutrality? Thanks to whoever it was if he actually existed.
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Old 17th October 2007, 02:53 PM   #1648
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Hi guys!

Well, just when i thoguht it was all over, i moved to uni and plugged my PS1 in (earlier threads lists the mods / other pics)

And it started to smoke!

I've had a look inside and this appeared to be the damaged part;

Click the image to open in full size.

Now, it was tested for approximately 150 hours before I left and all was fine, I dont have a meter with me but the only thing i can think of is that being 150miles away from home, the power system is different and so the voltages I set up in the linear PSU changed?

It was well packed on the way here too!

Any offers to what happened welcome! I have a few more 1002's so can swap parts out (linear psu once checked, IR remote mod etc) , but obviosuly dont want this happeneing again! (I was really lucky not to set off the smoke alarm - wouldnt look good on my 1st day!)

In the mean time im stuck with the rather mediocre output from my soundcard!! Its not nice having something that sounds so good and having to make do!


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Old 17th October 2007, 04:33 PM   #1649
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Hi Dan

Looks terminal for that PU-8 board!
Is the chip on the otherside cooked?
What mod had you done as I do not see any
22k ground resistors on the RCA terminals in the picture
along the lines of the Mike_F mod.
Hope the power supply is still alive?? Any
possibility of a stray piece of wire rocking
around against the shielding during transit?
Something happened to your linear supply in transit
or vibration changed the values?
If you have another motherboard its back to Av
mode for a while. (:-(( Hope the laser assembly is alive!

Maybe the trace cuts and were marginal or
the removal of Cap on top near RH channel RCA. Hard to know
without seeing the rest of the board clearly.

Check out the voltages on the linear supply and maybe go back to the Old supply until you are sure of the linear one being 100%.

Good luck!


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Old 17th October 2007, 04:49 PM   #1650
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Hi Dan, I doubt it has anything to do with power supply. Your supply looks lovely.
Your output makes no sense though, why is the blue wire and what looks like the screen wire joined together and where are the other channel wires?
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