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Old 26th November 2005, 01:07 AM   #81
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Thank you very much Dragon Master for that pinout ,
is 3,6 V and 7,6 V all ,no other voltages ?
This was the answer i needed , a normal PSU is much easier
that i thought !

Greetings from Germany

Jürgen
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Old 26th November 2005, 02:07 AM   #82
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Nope, nothing else.

Here's the text description:

1: 7.6v (Thru power switch)
2: Ground
3: 3.6v (Thru power switch)
4: Ground
5: 3.6v (Always on)
6: Ground
7: 3.6v (Reset sw / thru pwr switch, resets when switch disconnected)

The only thing I'm not sure about is that 2 pins of a 4-pin IC are connected between the reset switch and reset pin(7). Maybe it changes something when the switch is pressed or not.
Anyways, the voltage measured at the pin was 0 when reset is pushed and 3.6 if not.

I am not able to read the markings on the IC.

I guess a 12vAC transformer with two LM317 should work. I don't know if 1.5A is enough as the PSX with the current PSU uses 17w.

Maybe LM150 or LM138 would be safer in this case.


Mine measured 7.7v and 3.7v but a lot of sites with PlayStation info state that the voltages from the PSU are 3.6v and 7.6v.

Mick, do you know the use of the trimmer on the current PSU?
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Old 26th November 2005, 08:26 AM   #83
jives11 is offline jives11  Europe
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Quote:
Originally posted by Mick_F



I would also be interested in a display but I am afraid that this is a bigger job....

A description of how to include a RC unit in the PS1 case is given here. Look at the latest update on the bottom of the page.




Attached is a schematic of the output stage.

Mick
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 ?
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File Type: jpg output2.jpg (3.9 KB, 2804 views)
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Old 26th November 2005, 08:59 AM   #84
wrl is offline wrl  United States
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I used my ps2 as a cd player for awhile. The low output actually worked well with my homebuilt preamp and kept it from saturating. However, now that I've fixed the preamp gain prob, the PS2 fan is too noisy for my tastes.

-Wes
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Old 26th November 2005, 09:14 AM   #85
back is offline back  Greece
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hi i have a scph 5502 and the psu conector have only 5 cables.
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Old 26th November 2005, 01:55 PM   #86
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Quote:
the PS2 fan is too noisy for my tastes.
Crank up the sound!

Quote:
hi i have a scph 5502 and the psu conector have only 5 cables.
Yes, I found a site on the Internet with the pinout for the 5-pin version.

Here's the pinout:

1. 7.6v
2. GND
3. 3.6v
4. GND
5. Reset (3.6v when not pushed/ no more current when off)

They removed the pins 4/5 of the 7-pin version and pins 6/7 are replacing them.
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Old 26th November 2005, 02:16 PM   #87
back is offline back  Greece
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thanks dragonmaster.

i was thinking to use an ATX psu from an
old pc but i am not sure because it is switching.

do you guys think i should do it or
i should build a clasic one from scratch?
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Old 26th November 2005, 02:37 PM   #88
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The current PSU is switching so I don't think there's a problem here. Anyways, SMPS PSUs are noisy so I don't think an ATX would be much better. Build a classic one. It's cleaner, simpler, and doesn't whine like normal SMPSes.
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Old 26th November 2005, 05:14 PM   #89
jives11 is offline jives11  Europe
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Default Hmmm, like tiny ants ....

Well I stripped the PSone down, to clean it, check for hack-chips and genreally feel my way around. Mick_F's photos are fantastic BUT larger than life - those components are so small !. Removing the DC caps would definitely be a one-way street, I doub't I could get the caps back on having removed them.

Maybe I'll defer to the huge body of German knowledge on this subject, where they don't appear to modify the actual board
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Old 26th November 2005, 05:20 PM   #90
back is offline back  Greece
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thanks again i will build a new one
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