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Old 8th July 2006, 04:21 PM   #1051
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After these helpful revelations about the SCH5502
still having the 67.7376MHz like the 1002s (True?)
I became interested in looking inside my
trusty old CD32 CBM box that predates the
release of the Playstation my at least a year
or two. I took it down to the Motherboard
and looked at the components and the build quality.
It was hard to get off the shielding and not as easy
to work on compared to the Sony hardware. The CD32
CD display metaphor is so much more creative than
the Sony one. Also the Power supply is not SMPS
but more traditional. You have 12v @ 500ma plus
5v @ 2.2 amps. Total around 17watts. Now I wonder
if the PS1 at 9 watts (5502)and SCPH1002 at 12watts
could work with the CD32 power block using
LM317 plus LM350 regulators or would we need more power
for the 7.6volt supply? Its a neat 4 Din pin
based block far away from the player. The Regulators
and extra caps could live in the PS1 box and cool
running would prevail? (:-))

Since CD32s are not flavour of the decade maybe
two CD32 power packs giving you 4.4amps at 5v and
1amp at 12v.

I enclose a picture of a CD32 and power block
for reference.



PS. The Playstation WIKI has a list (it looks like) all Playstaion
models regardless of their distribution areas.
Attached Images
File Type: jpg cd32pwr&player.jpg (13.2 KB, 1115 views)
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Old 8th July 2006, 04:39 PM   #1052
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After these helpful revelations about the SCH5502 still having the 67.7376MHz like the 1002s (True?)
Who told this?
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Old 8th July 2006, 04:53 PM   #1053
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Somewhere way back in the thread someone said:
"The older types, i.e. SCPH 1002 and SCPH5502 have got a separate oscillator of 67.7376MHz in order to clock the RISC CPU CXD 8806 whereas this clock frequency will be halved before it is send to the CPU itself. This divider seem to be inside the chip.
To me it seems, that the clock for the CD is generated by dividing the 67Mhz by four in order to get 16.9344 MHz. Doing this is very favourable in terms of signal quality, i.e. accuracy and jitter."

Sorry I am about to fall asleep its 12.50 am and I will look for the location later in the day if I can !

Anyway I assumed that the 5502 had the set up like the 1002
and only when the 7502 came out did the audio section go down
hill in the jitter department !


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Old 8th July 2006, 05:04 PM   #1054
phn is offline phn  Sweden
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"Sound Scope," whatever it is, was introduced on the 7*** model. Probably not bad for gaming, but most likely is for music.
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Old 8th July 2006, 05:04 PM   #1055
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It was back at POST#165 of this tread similar statements were made and not contradicted .
"mick i have a 5502 and it is exactly the same with with 1001-1002.

the only difference between them is the opamp and the rca output.

from the AV/OUT they are the same and the dac`s are the same
and the 67MHZ oscillator is the same but the 7xxx 9xxx and
ps one are different."
So I assume the 5502 has much in common with the 1002!

I am really of to bed now!

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Old 8th July 2006, 05:42 PM   #1056
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Maybe they're the same.

Layout, PSU, DAC & shielding are different, as well as no RCA on the 550x, but they sound about the same. (7000 vs. 1001)

BTW, the 700x looks like it's the same as 550x on the hardware side. I wonder if the ones after 700x are different from the older models.
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Old 9th July 2006, 02:54 AM   #1057
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Have a look at this URL and scroll
down to view PS1 model history.The
page also has a nice Graphic of the
Playstation logo.

Perhaps one could make a transfer and
use ithe logo on a remote power supply box!

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Old 10th July 2006, 08:13 AM   #1058
razz is offline razz  United States
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Hi, I have been using ps1 for cd players for many months as a result of this thread and others, thank you. 5501's have been very easy to find here on ebay, I have around 8 of them + a couple of 1001's that I save for future mods. Even 5501's have a tendency to overheat, I was having dropouts on mine last night, I need to get the power supply separated. I don't have a lot to add to this discussion but I will say that there are expensive shielded cables for the ps2 made by monster and pscyclone (sp?) that will work with the ps1. These cables are connected to the a/v multi-out, which is the best "tap" to connect to in unmodded ps1's as I understand. They retail for around $50-60 but a savvy ebayer can get them from $10-25. Hint: think Trader's Circuit (ie Circuit City Liquidators). I apologize if this has already been mentioned by others, I'm not about to read the thread to find out. Not everybody believes in cables but $10 for a nice thick cd player cable with gold connectors is worth investigating, Cheers
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Old 10th July 2006, 09:58 PM   #1059
johnm is offline johnm  United Kingdom
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Well I finally managed to perform Mick_F's output stage mods to my model 1002 Playstation this evening. I took out those 6 caps, plus the SMT resistor by the back of the board, replaced with one 4.7uF 50v Black Gate N per channel (only 3.60 per cap which for this project is more than justifiable). As luck would have it also had some solid silver wire someone had sent me ages ago which I used to wire up to the phono sockets, with a 22k resistors between '+' and '-' per channel.

I have only fired it up for 5 minutes but already my jaw is hitting the ground. The sound is so clear, full of life and involvement, and yet neutral as well. I don't want to hex anything at this early stage but so far it sounds like a giant killer with these mods - I can see why people are spending alot of time on modding these games consoles!

Thanks again goes to those who got the 'modding ball' rolling on these consoles. I'm seriously impressed

- John

P.S. will post some pics once I've worked out how to do it
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Old 11th July 2006, 07:04 AM   #1060
Mick_F is offline Mick_F  Germany
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Another satisfied customer

Please show us some pics!!

No statement here.
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