farfisa fast 2 oscillator

[alschnier]

hey all.
new to forum. looks great.

I have a fast 2 w. a few issues - the major one being that the Bb keys do not make any sound (other than a bit of a pop when contact is made). I've opened it up & poked around. did not find anything obvious (no cold solders/burned out caps etc.).

these do not have separate "cards" like the compacts, but there seems to be a dedicated circuit for ea. note near the tuning pot. I'm guessing I have to replace a transistor or capacitor, but this is where my knowledge ends. where do I begin? replace them all? is there a usual culprit? finding info on fast 2 has been a bit more challenging, appreciate any advice.

thx,
al

ps - 1 other minor issue - bottom 4 notes of the treble section are an octave higher than they should be (not sure where to locate divider circuit).

[karl]

Hi Alschnier,

On a combo organ of this vintage: If all of the Bb keys are not sounding, That points to a master oscillator problem. There should be 12 individual oscillator circuits (one for each note in the octave). Each of these are fed into a divide down circuit to get each octave's set of notes. Look for a label or numbering system to tell you which circuit corresponds to which note.

Try re-flowing the solder around the master osc that is not working.
A capacitor may be bad - but it is more likely that one of the transistors is bad.

Good Luck
Karl

[citadin]

Wow Al, is your Fast2 orange? That is the most beautiful organ ever made....