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gambit
Copper Member
United Kingdom
4 Posts |
 Posted - 02/05/2010 : 12:23:21
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does anyone know what the trimpot in the PS-2 does? just got one and the delays are really noisy.. equal part repeat/white noise.. 
this site mentions "The earliest PS-2s suffered from high frequency noise. This was alleviated from serial number 845800 but earlier units can be modified to the later specification by changing 3 capacitors."
who does this mod? or where can i find details of it? |
Edited by - gambit on 02/05/2010 12:29:41 |
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Dr. Bob
Moderator
Australia
7194 Posts |
Posted - 02/06/2010 : 02:54:55
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Hi gambit
There are actually 2 pots VR-4 & VR-5
They are the Clock frequency adjustment.
You will need a Frequency counter, or a "really accurate" tuner to set these up properly.
Don't fiddle with them unless you know what you are doing.
I posted instructions to set-reset these pots previously,
sometime mid to late last year.
Regards Dr. Bob  |
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gambit
Copper Member
United Kingdom
4 Posts |
Posted - 02/06/2010 : 11:30:18
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quote:
Originally posted by Dr. Bob
Hi gambit
There are actually 2 pots VR-4 & VR-5
They are the Clock frequency adjustment.
You will need a Frequency counter, or a "really accurate" tuner to set these up properly.
Don't fiddle with them unless you know what you are doing.
I posted instructions to set-reset these pots previously,
sometime mid to late last year.
Regards Dr. Bob
thanks Dr Bob. will have a look for it.. but the pots relate to the pitch only? do they have any effect on the delay and white noise that comes with each repeat?
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ChristoMephisto
Platinum Member
Canada
1315 Posts |
Posted - 02/06/2010 : 16:52:24
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For the earlier PS2s, you'll need to add a .0047uf cap in parallel to both C3 and C21 on the analog board, the top one, and swap out C6 on the lower board from a 47uf/6.3V to a 470uf/10V cap.
Both trimpots are connected to the Fine/Manual pot and are for the pitch aspect only.
Altho I've heard you can do the Hi-Cut mod on these, but its such a dark delay, don't know if it'd be worth it.
good luck |
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nightraven
Copper Member
Netherlands
4 Posts |
Posted - 02/08/2010 : 13:16:14
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| so the trimpot is to fine tune the pitch? would it be worth me messing with it because the octave up mode is ever so slightly flat and it's kind of annoying. i cover it up by winding up the feedback haha. |
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ChristoMephisto
Platinum Member
Canada
1315 Posts |
Posted - 02/09/2010 : 22:13:23
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quote:
Originally posted by nightraven
so the trimpot is to fine tune the pitch? would it be worth me messing with it because the octave up mode is ever so slightly flat and it's kind of annoying. i cover it up by winding up the feedback haha.
Welcome to the forum!!
Might be worth the time to fine tune it.
If you need the service notes, shoot me a PM |
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nightraven
Copper Member
Netherlands
4 Posts |
Posted - 02/11/2010 : 19:31:06
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quote:
Originally posted by ChristoMephisto
Welcome to the forum!!
Might be worth the time to fine tune it.
If you need the service notes, shoot me a PM
thanks 
i'll find myself a chromatic tuner and play around the trimmers inside then ;) |
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Dr. Bob
Moderator
Australia
7194 Posts |
Posted - 02/12/2010 : 13:56:16
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Hi gambit, nightraven & Guys
Here is the link to the official factory setup for the trimpots in the PS-2
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=8342
Here is another link showing pictures of the HF cap mods.
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=8231
BTW, I used the search method I posted earlier for Altavista.com
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=9017
I located these older posts in less than 1.5 mins.
=== PS-2 trimpot settings extracted from above link ===
The official factory setup procedure for VR-4 & VR-5
(The service guys said I'll have to kill you after you read this) - Just Joking...
Use a good quality regulated 9VDC power supply. (NOT a Battery).
1/ Connect a good quality tuner like the (TU-12, TU-100)
it's better to use a frequency counter, connect either to the TUNER OUT jack.
You will also need a lead plugged into the input socket to turn it on
2/ Turn MODE to [4].
3/ Turn FINE/MANUAL fully clockwise and adjust VR5 for C# (277.18Hz).
4/ Turn FINE/MANUAL fully counterclockwise & adjust VR4 for B (61.735Hz).
5/ Non-Official step.
If none of this makes any sense don't attempt to adjust the trim pots.
You will not be able to just guess their settings.
Good Luck - enjoy.
If it breaks - we know nothing - you didn't read this here...
Regards Dr. Bob
PS - It's always a good idea to place a mark, using a fine-tip marker pen,
on the trim pots before you attempt to adjust them.
That way, at least you'll have some idea as to where they were originally set.
(whether they were set correctly or not).
=== End Extract ===
Regards Dr. Bob |
Edited by - Dr. Bob on 02/12/2010 13:59:41 |
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Topic |
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Boss PS-2 - What does the trimpot do? Any mods?
