dead phase 90

Started by chokeyou, February 03, 2004, 09:43:48 PM

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ahermida

you never said if you have an older Phase 90 or the reissue.

Alf

chokeyou

its the reissue, sorry

Fret Wire

Well, at least no wires to worry about on that one, only the battery connect, which hopefully you didn't reverse. Does it have any caps or reisitors removed. Somebody could have done the script mod to it, and instead of pulling the resistors and caps, they might have clipped one end, and accidently shorted it out on another component.
Fret Wire
(Keyser Soze)

chokeyou

nah there wasnt any evidence that it had been modded or anything. but about that battery thing, when it wasnt working one of the things i tried was reversing the battery jumper....thinking maybe it was backwards when i got it. that didnt screw anything up did it?

ahermida

There are 2 diodes near the battery clip socket in the circuit board.  The diode nearest to the clip is the Zener...you need that one.  The next one is the diode used to prevent reverse polarity from damaging the pedal (...whatever...).  That one must be dead in your pedal...if you test continuity on it it might display a short....take it out.

Check this pic...in the lower left corner you'll see a silver-like diode (that's the Zener):

http://acapella.harmony-central.com/forums/attachment.php?s=&postid=6750568


Once you put a new zener (assuming that's the one you broke), the pedal should work.  If you get a clean sound without the phasing it means that the LFO is not working (the dual opamp may be dead) OR the Jfets are dead (this happened to the one I have in my hands rignt now).  Just replace the Jfets and you're ready to go.

That's all I have for now.

ahermida

There are 2 diodes near the battery clip socket in the circuit board.  The diode nearest to the clip is the Zener...you need that one.  The next one is the diode used to prevent reverse polarity from damaging the pedal (...whatever...).  That one must be dead in your pedal...if you test continuity on it it might display a short....take it out.

Check this pic...in the lower left corner you'll see a silver-like diode (that's the Zener) and the one on top of it is the regular diode:

http://acapella.harmony-central.com/forums/attachment.php?s=&postid=6750568


Once you put a new zener (assuming that's the one you broke), the pedal should work.  If you get a clean sound without the phasing it means that the LFO is not working (the dual opamp may be dead) OR the Jfets are dead (this happened to the one I have in my hands rignt now).  Just replace the Jfets and you're ready to go.

That's all I have for now.