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Old 15th May 2008, 12:26 PM   #2041
Tolu is offline Tolu  Germany
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Quote:
Originally posted by despotic931
The distortion sounded the same on the pressed cds as it did on the cd-rs, it sounded like a scratchy form of clipping. Not soft clipping at all, but rather like a hard square wave, very harsh. I was assuming it was a problem with the gain setting. However having moved and not taken on any projects since moving, I've kept my multi-meter is packed away in storage. I do however have another psx in my possession (a 5501, not a 5502 as previously stated). Lacking a multi-meter at the moment I was thinking I was going to have to wait till I could get to my storage to dig mine out, but instead I had an idea (I know how dangerous those can be!)...

I plugged in the 5501 and tested it out, it played my cd-rs fine, although didn't sound as warm as my 1001 in my opinion. Knowing that the 5501 worked though meant that I knew it's laser unit was functioning properly. I opened them both up and proceeded to swap the laser units. First up was the laser unit from the 5501 connected to the 1001, hmmm worked fine. Then I fired up the laser unit from the 1001 connected to the 5501, it worked but still had a minimal amount of distortion. This meant the distortion traveled with the laser unit from my 1001. So there where two options, either the 1001 laser unit was bad, or the only adjustment on the actual unit itself (the intensity) was out of wack. I decided to hope that the problem had to do with the adjustment being out of wack and plugged the 1001 laser unit back into the 1001 ps. I then decided as well that I would just tweak that adjustment a little without a meter or anything, just to see if it improved the situation (I figured it couldn't get any worse, hehe). I turned it a little clockwise, hmmm, less distortion. I turned it a little more, hmmm even less distortion! One more little turn and the distortion was completely gone! Then one more turn for good measure, this last turn was a bad idea, as the distortion came back even worse! So, back a turn and now everything is working fine! I still plan on digging my meter out and checking values, but I'm just happy to be able to report it has played everything I've put on it since this little experiment! A few more test, and me digging my equipment out of storage, and the modifying and tweaking will commence!

-Justin
What value did you change? Bias or gain?

I had problem with one unit that didn't play any CDs so I adjsuted bias. The only value where every CD was read was at 1.47 V.

The only CD that makes problems starting at track 8 is "A fortnight in France" from Patricia Barber. It's a copy controlled CD which also makes trouble in my other PS1.
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Old 15th May 2008, 05:10 PM   #2042
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Quote:
Originally posted by Tolu


What value did you change? Bias or gain?

I had problem with one unit that didn't play any CDs so I adjsuted bias. The only value where every CD was read was at 1.47 V.

The only CD that makes problems starting at track 8 is "A fortnight in France" from Patricia Barber. It's a copy controlled CD which also makes trouble in my other PS1.
Hehe, I haven't touched either the bias or the gain. I simply tweaked the laser intensity adjustment. I did this while one of the distorted CDs was playing and just tweaked that adjustment until it played the CD fine. However I need to get my multi-meter out and do some actual measurements. And I also need to finish my turntable restoration project, repair my favorite amp, build the speakers I've had my eye on...geez this stuff gets addicting and piles up fast!

What is the exact problem you are having with track 8 on that cd?

-Justin
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Old 15th May 2008, 05:17 PM   #2043
Tolu is offline Tolu  Germany
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Quote:
Originally posted by despotic931



What is the exact problem you are having with track 8 on that cd?

-Justin

It stutters! The last 2 or 3 songs of the CD! Don't know why!

How much have you turned (intensity pot) in what direction. I have read somewhere that you should turn max. 90.

A measurement would help!
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Old 15th May 2008, 06:42 PM   #2044
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I found if I turned it max in either direction the CD would simply not play, i would say I only had to turn it about 20-30 degrees clockwise from its original location to get mine to play smoothly. Unfortunately I have yet to get the chance to go to my storage and get my tools, and the projects are piling up! I will get them this week and get you the measurements, hopefully we can get yours running to perfection!

-Justin
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Old 16th May 2008, 01:23 PM   #2045
Tolu is offline Tolu  Germany
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I will try to get a CD drive from the "newer" Playstation One (KCM440BAM) which shall be the best of the drives and can be used as a spare part for the SCPH-100x!
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Old 16th May 2008, 09:12 PM   #2046
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bought a 'Barely used" scph-1002 off ebay quite cheaply.
this is the first ps1 of 4 that i have that plays all my cd's and cdr's without any hitches. the transport performs equally well in the other ps1's. this is a little strange as i bought 2 NOS transports from the internet that didn't perform half as well.
ah well, who am i to question it? time to sit back with a glass of single malt, and let the notes wash over me.
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Old 27th May 2008, 11:34 PM   #2047
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Hi

I replaced at the output stage the cap from WIMA MKS 1 to Audyn Cap MKP QS 10 and the resistor from 47k to 1k and added a 1k resistor in series.

Volume and bass are higher than before but the spatiality has decreased and detail information in comparison to the unmodified PS via Multi-AV-out.

What's wrong? Caps are new and out of the box! One reason? Is Multi-AV-out the best option?
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Old 28th May 2008, 01:05 PM   #2048
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I wish I could help, I have yet to mod mine, but I hope it's figured out before I tear mine anymore apart...
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Old 28th May 2008, 08:16 PM   #2049
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Tolu, you're loading down the output of the DAC with 1k, which is very heavy... if you had a dedicated opamp stage, it possibly would take that without problems, but a DAC direct output... I don't like the idea at all...
You may use your 10uF cap very nicely with the same 47k to GND as you had before... this is a clean audio output, there's nothing wrong with setting a very low -3db point... I bet with the 47k and the same cap, you'll have again the good sound you had before!
Remember, for most "weak" (meaning "not-power") opamps (and that includes DAC outputs, sure), a 10k or greater load is very beneficial...

Another possible side effect (and reason for the bad sound) of using that low value resistor to gnd, might be that you're also reducing the input impedance of your power amplifier, as you have that resistor AFTER the cap... it gets probably parallel with your volume pot, reducing impedance greatly... so, it really is a bad idea...
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Old 28th May 2008, 09:02 PM   #2050
Tolu is offline Tolu  Germany
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joydivision, you're absolutely right. I just wanted to rebuild the A/V-output stage after the enclosed well known circuit but did a mistake. I had to use 100k instead of 1k. What I don't understand is the use of C5 and C6. Are they 120 pF or 120 nF? What is their function? (Sorry but I am a MBA and not an graduate engineer!)

I am currently heating my solder iron and will remove the 1k aginst a 100k! What should I do with C5/6?
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