Roland Phase Five Problem

[danhera]

Hello,
          I have a phase five that passes signal but it does not process the signal.  There is a low frequency pulsing that happens but no effect.  Any help would be appreciated and if anyone has a schematic that would be great.  This is my first post so sorry if this is posted in the wrong forum.

thanks,

Jarrod

[Sir H C]

Mine initially had bad switches so it would never go into the phase mode.  That could be the issue, or the biasing for the FETs (I think it uses FETs for the phasing) could be off and killing the effect.

[petemoore]

  Welcome to the right forum Danhera !!!
 I have a phase five that passes signal but it does not process the signal.
 There is a low frequency pulsing that happens but no effect.
 Does the LF pulsing rate change when you adjust the 'speed' or rate pot? if it does then it is an indication the LFO is controlling an...LFO.
Any help would be appreciated and if anyone has a schematic that would be great.
 Schematic is a huge help, but I haven't seen the 5 schem. I'm guessing this is an analog phaser, and probably shares 'some' topology with 'a' phaser schematic that is available. It may be possible to reverse engineer and draw a schematic, we like that[?]. Knowing the chips used may provide enough to get a start on debugging, possibly voltage measurements on the chip pins can partially isolate a 'malfunct'.
 

[puretube]

Yes: you`re in the right forum.

Welcome!



Mr. Huge had the schem - but now he`s gone...
but it is here, too:
http://www.godiksennet.com/images/sch/Roland_AP5_phaser.pdf

err, at least, IF that`s the one 

[danhera]

it's good to be here!  yep, the LFO pulsing changes as I turn the pots.   I will check and see what chips and transistors it uses and report back.

-Jarrod