This sounds like the power supply is not adequate, or has a failure, thus
causing too low a supply current.

If you put your volt meter across the power supply output while running the
scanner, and if you see a dip in the voltage, you will know for sure that
the power supply is not proper. You can also do a current test to see how
much the scanner is pulling. Refer to the service specs to see what the
maximum current pull is for your scanner, and then compare to know if there
is a fault.

--

JANA
_____


"Ramset" wrote in message
oups.com...
On Jun 13, 2:09 pm, UCLAN wrote:
Ramset wrote:
I fried a diode used for protection in a Bearcat scanner. It was fried
by connecting the wrong power cord (reverse polarity) into it.
The AC adapter puts out 13.8VDC and 700ma. I tried replacing it with a
IN4001 and it powered up the display and started scanning. However
when I plugged the speaker and display light back in it didn't seem to
have enough power to start it all up. The display flashes once and I
hear a pop in the speaker but that's it. The original diode had
markings printed which I think was RA above VB.
Any suggestions on another diode to try?

You might want to give us the model number of the scanner. Many Uniden
scanners use REGULATED power. It could be that when loaded by the
speaker and display light, the AC adapter no longer provides the needed
voltage.

My BCD396T uses a 6vdc 800mA REGULATED adapter. I don't think the use
of the 1N4001 is your problem. I think that a) the AC adapter was
damaged by the incident, or b) the scanner was damaged by the incident.

--
GO ALINGHI! Beat the Kiwis.

The scanner is a BC780XLT. Today ,after work, tried turning the
scanner on and got the same response, the backlight blinked and I
heard a pop in the speaker. I unplugged the speaker and the turned the
scanner on. The display and its backlight came on and it started
scanning. I plugged a remote speaker into the jack on the back panel
and got audio. I disconnected the remote speaker and plugged in the
chassis speaker and it produced audio. All the scanners functions are
now working normally. I figure the new diode is right and I know the
power supplies, both the 12V and the AC adapter, are good because they
work on an identical scanner. For now I'm going to leave it alone and
if I have more problems I'll check my soldering work. Thanks for all
the responses.