http://www.eserviceinfo.com/
Search SCPH,
there's the SCPH-7500 manual for free. (just found it BTW)
If you want the 1000 series one it's here:
http://www.user-service-manuals.com/Sony/SCPH.shtml
Edit: This one has the DAC in the DSP.
And they DO have the good laser tracking adjustments.
It seems you need a special disc.
The voltage is 8v and 3.3v finally.
There's a 5v regulator on the mainboard.
Re: PS-Power Booster
Hi peter,
very nice ! Can you give more detail of the speakers ?
pieroh said:
Hi peter,
very nice ! Can you give more detail of the speakers ?
Re: Re: PS-Power Booster
Hi jives,
the speakers are original ESS-bookshelf from the seventies with the legendary ESS air motion transformers (a patented design by Oskar Heil) and a 30cm bass woofer. The speakers have a efficiency of around 93dB/1W, so 2,5W are prettty loud.
I refurbished the speakers some years ago and I will post a photo tomorrow.
The tube amplifier works without any silicon, tube rectification EZ80, ECC85 driver stage, EL95 output and without global feedback.
Sound is very nice not like a soundblaster with a tiny stereo IC-amp!! ;-)
Peter
jives11 said:
Hi jives,
the speakers are original ESS-bookshelf from the seventies with the legendary ESS air motion transformers (a patented design by Oskar Heil) and a 30cm bass woofer. The speakers have a efficiency of around 93dB/1W, so 2,5W are prettty loud.
I refurbished the speakers some years ago and I will post a photo tomorrow.
The tube amplifier works without any silicon, tube rectification EZ80, ECC85 driver stage, EL95 output and without global feedback.
Sound is very nice not like a soundblaster with a tiny stereo IC-amp!! ;-)
Peter
For sure! It's a tube design.
When my Soundblaster was my amp, it could shake things in my room(10'x10'), and I was able to hear the bass downstairs.
Most of you know this schematic already but I am cleaning up things at the moment....
I have just added my proposal for a linear regulated PSU replacing the stock SMPS on my website. I have posted this already in this thread in December 05.
All the best,
Mick
I have just added my proposal for a linear regulated PSU replacing the stock SMPS on my website. I have posted this already in this thread in December 05.
All the best,
Mick
Mick, I just found in the SCPH-750x service manual that the voltages should be 8v and 3.5v. The 8v is regulated on the board by a 7805 afterwards.
http://www.diyaudio.com/forums/showthread.php?postid=894618#post894618
And for those who wanted a SPDIF or I2S output, all the I2S signals are on the parallel port.
http://www.diyaudio.com/forums/showthread.php?postid=894618#post894618
And for those who wanted a SPDIF or I2S output, all the I2S signals are on the parallel port.
Antoine, I have seen your post. It is easy to change the resistors to the corresponding values of course. I will add a note referring to your findings.
Mick
PS. do you understand why we consistently measure 7.6 and 3.6 V on our units?
Mick
PS. do you understand why we consistently measure 7.6 and 3.6 V on our units?
DragonMaster said:
DM,
I was a bit confused at first, but after re-reading your comments and edit, it sounds like the edit refers to the SCPH-7500. Correct?
I just want to be sure before I plop down some bux for the SCPH-1001 manual.
Greg in Minneapolis
Hum.......
Hey guy's, I'm just about to dive into my 1002 now that my amp is finished and have a quick question.
I've noticed that there is a hum on both channels, has anyone else noted this? Also, would the output bypass mod cure it?
I wondered if it was some kind of ground loop, are the signal grounds tied together in the Playstation?
Any help would be much appreciated,
Cheers
Lee
Hey guy's, I'm just about to dive into my 1002 now that my amp is finished and have a quick question.
I've noticed that there is a hum on both channels, has anyone else noted this? Also, would the output bypass mod cure it?
I wondered if it was some kind of ground loop, are the signal grounds tied together in the Playstation?
Any help would be much appreciated,
Cheers
Lee
Re: Hum.......
Hi,
my PS is dead quite even when connected to a valve amp with rather high input impedance, which is ideal as the output of the PS is not loaded so hard.
Are you sure the hum is from the PS and not from your amp. Check your amps grounding, did you starwire everthing?
Is there only one connection to chassis ground?
As Mick mentioned before, the input impedance of the amplifier following the PS should not be lower than 47k.
My suggestion is to get hum free before you start to modify the PS.
Peter
Lostcause said:
Hi,
my PS is dead quite even when connected to a valve amp with rather high input impedance, which is ideal as the output of the PS is not loaded so hard.
Are you sure the hum is from the PS and not from your amp. Check your amps grounding, did you starwire everthing?
Is there only one connection to chassis ground?
As Mick mentioned before, the input impedance of the amplifier following the PS should not be lower than 47k.
My suggestion is to get hum free before you start to modify the PS.
Peter
Re: Re: Hum.......
Thanks for the reply Peter, I don't have a ground to the chassis as this has a safety earth for the PSU. All the input wires are shielded to the pot (100K) and to the board.
The thing is, if I connect my old CD player it has only a very, very faint buzz and my MP3 player has none what so ever?
Thanks anyway
Lee
pieroh said:
Thanks for the reply Peter, I don't have a ground to the chassis as this has a safety earth for the PSU. All the input wires are shielded to the pot (100K) and to the board.
The thing is, if I connect my old CD player it has only a very, very faint buzz and my MP3 player has none what so ever?
Thanks anyway
Lee
Re: Re: Re: Hum.......
PS not also connected to anything else i.e a TV ? Just a thought.
Lostcause said:
PS not also connected to anything else i.e a TV ? Just a thought.
Re: Re: Re: Re: Hum.......
Nope! Just the amp.....????
I did notice this with my old amplifier but that was before I conected it to my highly efficient MLTL's and now I realy notice it!
This impeadance thing has always baffled me, what if I do the bypass mod with 100K resistors?
Lee
jives11 said:
Nope! Just the amp.....????
I did notice this with my old amplifier but that was before I conected it to my highly efficient MLTL's and now I realy notice it!
This impeadance thing has always baffled me, what if I do the bypass mod with 100K resistors?
Lee
I currently only have a tube amp, about 40 years old. But I used to play the PSX on a more recent ss amp as well. No hum. No nothing. Well, there's very low hum from the tube amp if you put your ear to the speaker. (Do normal people press their ears to their speakers?)
I assume the impedance differs, and they do sound different. But I wouldn't know if the difference is related to the impedance or the amps themselves. The tube amp does sound "fuller," which is the thing I like about tubes and vinyl as well as the PSX.
I'm currently scouting for a new amp, either chip or class D. I don't expect any impedance-related problems.
I assume the impedance differs, and they do sound different. But I wouldn't know if the difference is related to the impedance or the amps themselves. The tube amp does sound "fuller," which is the thing I like about tubes and vinyl as well as the PSX.
I'm currently scouting for a new amp, either chip or class D. I don't expect any impedance-related problems.
Well, I know that with my unmodified PS1 I can hear some noise (no hum) when I put my ears very close to my speaker (90 db/Wm). I don't recall if it is the same with the modified output stage.
Mick
Mick
[y/n]? Y
If you want to take the time to find the topic where I compared the A/V multi out(No opamp) and RCA outputs(an opamp), you will find the answer. I'll tell you. It's the buffer stage(With all the hum probably caused by the PSU or something like this). So, yes, the bypass mod solves this.
Maybe you have a different kind of hum, but bypassing solved my problem.
Note that I found that hum by putting my -120dB S/N amp at max volume while on pause.