L&R ultrasonic cleaner schematic

[k clark]

Does anyone have a schematic for an L&R T14 transistor ultransonic cleaner?

Matt

[Mark Fraser]

Have never seen one, but they're pretty basic. What usually
happens is that one or more wafers become unbonded, often due
to items resting on the bottom of the tank, resulting in one
of several things: wire breaking away from wafer, wafer shattered,
little holes in tank adjacent wafers. Could also be, in some
circuits, that the loss in mechanical coupling of the wafers to t
the tank results in "detuning" of the resonant circuit, of which
the mechanical apparatus (wafers/tank) is a part. You may also
find a power transistor failed, but most often it seems the wafers
are the problem.

Lone Star in San Antonio or somewhere like that have served me
well with repairs etc. Mike Fritz is the person - just my opinion
as a customer. / mark

[Mark Ford]

Re UT's
FWIW They can actually be quite complicated, (and dangerous!) some UT's have
randomizer circuits that alter the cleaning frequency/pattern to maximize
the cleaning power, so remmember measuring the o/p frequency etc may be
misleading!.
I would go straight for the interal fuse and then ,the bridge rectifier and
capacitor's then diode check the power transistor, (thats if you have a 'no
operation' condition.), also check to see if the transformer is getting hot
that may also mean you have a duff rectifier/transducer/power transistor
down)

If the tank is working , but poorly, then you may well have a transducer
problem, remember if they are broken off they require special bonding to the
tank, for maximum effeciency.

Remember not to operate the tank without water or the transducers mayl
fail! - and never put your hands into a tank when its on, (the ultrasonics
can cause bubbles in your blood!!).

Regards,
Mark

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