As it takes a few minutes for the fault to appear, it may be as something
heats up. If so, you might be able to find it using freezer spray. Cool
the faulty part and it should put out the LED.


Gareth.



"Cauley Felps" wrote in message
...
Hi All,

I mailed this to Alesis support, but evidently, they don't give out
such info. If anyone here is familiar with such problems and can help,
I'd appreciate it.

-pasted question-

I have an AI-3 converter which has a very minor problem with the LEDs.
The clip light for the third channel will glow continuously, as if
something is leaking a slight voltage to it. It usually takes a few
minutes after the unit powers up to reach a visible intensity, and
stays there from that point on. The rest of the unit (as well as the
other lights) functions properly.

This unit is well beyond warranty and I am considering carefully
replacing some parts to see if it fixes the light. I notice a group of
four 14 pin, surface mount LM339 chips right near the front panel
connector (marked from U53-U56). Are these a likely culprit for a
problem with the clip LED's? If not, what other parts would you
suspect?

----------------
There are 8 clip lights as well as 8 signal present lights on the
panel.

Please reply in the group (and Thanks!)

PS- I realize I'm getting into some small stuff here. I've got a
magnifier/light on a boom and a rework station which I could use some
practice with. - I'll be real careful

In article ,
Cauley Felps wrote:

Hi All,

I mailed this to Alesis support, but evidently, they don't give out
such info. If anyone here is familiar with such problems and can help,
I'd appreciate it.

-pasted question-

I have an AI-3 converter which has a very minor problem with the LEDs.
The clip light for the third channel will glow continuously, as if
something is leaking a slight voltage to it. It usually takes a few
minutes after the unit powers up to reach a visible intensity, and
stays there from that point on. The rest of the unit (as well as the
other lights) functions properly.

This unit is well beyond warranty and I am considering carefully
replacing some parts to see if it fixes the light. I notice a group of
four 14 pin, surface mount LM339 chips right near the front panel
connector (marked from U53-U56). Are these a likely culprit for a
problem with the clip LED's? If not, what other parts would you
suspect?

----------------
There are 8 clip lights as well as 8 signal present lights on the
panel.

Please reply in the group (and Thanks!)

PS- I realize I'm getting into some small stuff here. I've got a
magnifier/light on a boom and a rework station which I could use some
practice with. - I'll be real careful

It might be a faulty capacitor or faulty chip. A faulty chip would be
very sensitive to heat but a faulty capacitor would be more sensitive to
how long it has been powered. Also check for acid flux that has oozed
off a soldered heatsink - it conducts a little.