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 PH-2 schematic/repair notes??		  New Topic  Reply to Topic
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Laurie
Double Platinum Member

Canada
4854 Posts
Posted - 05/04/2008 :  17:28:43  Show Profile  Visit Laurie's Homepage  Reply with Quote
G'day! I have a PH-2 that I'm starting to suspect has had the trim-pots twiddled sometime in the past. Just doesn't sound "right" - not a component failure, just not right.

Does anyone know where I can get the workshop notes (preferably the ones with waveforms)? A schematic would be great too!!

Thanks in advance,
laurie.

PS: I've looked in all the usual places on the WWW and the PH-2 (and PH-3) schematics seem to be missing in action
Edited by - Laurie on 05/04/2008 17:34:54

Dr. Bob
Moderator

Australia
6593 Posts
Posted - 05/04/2008 :  17:39:48  Show Profile  Visit Dr. Bob's Homepage  Reply with Quote
Hi Laurie

Check your PM.
Sch. only, please let me know if you get the actual service notes.

Perhaps Ssanyee or Christo might have them.

Regards Dr. Bob
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ChristoMephisto
Platinum Member

Canada
1288 Posts
Posted - 05/04/2008 :  17:43:16  Show Profile  Reply with Quote
Sent you a copy of the schems, can't remember where i found them...
no service notes i'm afraid
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Laurie
Double Platinum Member

Canada
4854 Posts
Posted - 05/04/2008 :  18:21:16  Show Profile  Visit Laurie's Homepage  Reply with Quote
Hmmm... just pulled it apart. There is only one trim-pot and it has a drop of paint/wax holding it in the factory position. Guess it's just my ears

Thank you both for the schematic! It always makes more sense when you can see the signal path!
Edited by - Laurie on 05/04/2008 18:22:10
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ssanyee
Silver Member

Hungary
288 Posts
Posted - 05/05/2008 :  08:47:19  Show Profile  Reply with Quote
Hi Laurie, Bob, Christo, Guys,

The reason of the trimpot can be same as in case of chorus pedals: to adjust minimum distortion at the output of the IR3109 IC (normally I guess should be adjusted to half supplied voltage).
Hope the schem you have got from Dr. Bob and from Christo are okay for you!
I have PH-3 schem, inform me if it is needed to you!

cheers
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