Re: LED Tuning light
Hi Brian and Kevin,toggle quoted messageShow quoted text
An LED that it not lighting (when it should) usually has two possible
causes-- either the LED itself is burned out, or the active device
(diode or transistor) driving the LED circuit has failed. Usually a
technican would use a voltmeter to determine whether or not the LED
input circuit has a positive voltage (to ground) when the LED should be
lighting. If there is the normal positive voltage, the LED itself is
probably bad. If the voltage on the input circuit is missing at all
times, most likely the diode or transistor (or sometimes IC) driving
the circuit has probably failed. You will need to locate these
components on your schematic diagram, Brian, then check for that LED
input voltage (either on the circuit board, or LED input pin).
From: dhsatyadhana <dhsatyadhana@...>
To: ultralightdx <ultralightdx@...>
Sent: Sun, Mar 27, 2011 5:48 pm
Subject: [ultralightdx] Re: LED Tuning light
Alas, all I can give is qualitative suggestions - I am probably about
as handy with true tech work as you are, so wouldn't feel comfortable
going any further. Anyone else???
--- In ultralightdx@..., "Jerry"
the "trace" is. The wires coming from the pcb to the led?
out how exactly to route the tuning dial string. I was amazed I was
able to actually do it after a few tries.
indicator light out from looking at the schematic, but again, I am far
from a technician.
the general concept behind what causes the indicator to light, where it
usually would connect to.....
> Thanks again
allow you to test if there is voltage coming to the LED as well?
<brianalexmiller@> wrote:Kevin S
most active DX message board I know of so maybe someone can answer me> I know this is the ultralight DX board, but it is the
even though this is not about ULR's.
portable Sony analog AM/FM radio - TFM-7250W.
bucks and I took it apart to clean it and to retro-fit it with an 18">I got the thing at a garage sale last year for five
outboard ferrite antenna.
little red tuning led to light anymore.
> >missing something.All of the connections look good to me but obviously I'm
of a connection would be made generally.