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K200B-2 Problem [message #15214]

Fri, 04 February 2011 18:56

cassent5150
Messages: 341
Registered: August 2009

Senior Member

Does anyone have a schematic they might e mail me for this PC-303 board. I've got a real weak tremolo circuit. Speed is functioning but you have to turn intensity full open to hear it. I took a quick run through with a ohms meter and there is no shorted caps or open transistors so I'm thinking a leaky cap or failing transistor. Any ideas or typical problems info is sure welcome. Thanks Steve C

cassent5150@hotmail.com

Steve C

[Updated on: Fri, 04 February 2011 18:57]

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Re: K200B-2 Problem [message #15218 is a reply to message #15214]

Sat, 05 February 2011 12:22

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

I have that schematic, but have no way to scan it so as to email to you.
If you fail to gather one from one of the other folks here, let me know and I can copy and mail you one.

More than likly the weak pulse is due to a cap or caps that have shifted value, and or have gone way high in their ESR ( effective serise resistance) value.

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Re: K200B-2 Problem [message #15221 is a reply to message #15218]

Sat, 05 February 2011 16:13

cassent5150
Messages: 341
Registered: August 2009

Senior Member

Thanks Stevem, thats kind of what I was thinking. If I cant find a shorted cap or open transistor on a board I'm working on, I usualy recap it and that usualy fixes it , but man, theres a lot to recap here. Thanks to Tom I got the schematic at
http://schematics.number26.org/index.php?dir=kustom/
so I'll look the schematic over and just recap the ones in that section and see if that remedies the problem. Steve C

Steve C

[Updated on: Sat, 05 February 2011 16:20]

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Re: K200B-2 Problem [message #15228 is a reply to message #15214]

Mon, 07 February 2011 12:23

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Don't forget that the effect is really vibrato (pitch shift) and not tremolo (volume change), so it may seem weaker than you might think.

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Re: K200B-2 Problem [message #15229 is a reply to message #15228]

Mon, 07 February 2011 23:14

cassent5150
Messages: 341
Registered: August 2009

Senior Member

WOW Thanks, I didn't even note that when reading the schematic. Yea, that would be why I thought after recaping and changing out transistors it still wasn't right. Now that puts what I hear in perspective. Thanks again. Steve C

Steve C

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