Yaesu ft2500m bulb failure..

Yaesu ft2500m bulb failure..

Post by Dusti » Thu, 26 Feb 2004 04:05:37

Hello, I have a Yaesu ft2500m radio. The bulbs for the display have burned
out. I have read that other people with the same radio have had the same
problem and was wondering if anyone has replaced the bulbs with anything
different then the factory bulbs? if so what did they replace them with. any
part numbers would be great.. also if anyone can give me a part number of a
bulb through radio shack or an electronics store like that would be great. I
would like to replace them. Thank you very much.

                                                    Dustin

 
 
 

Yaesu ft2500m bulb failure..

Post by Mark Kei » Fri, 27 Feb 2004 07:53:17



> Hello, I have a Yaesu ft2500m radio. The bulbs for the display have burned
> out. I have read that other people with the same radio have had the same
> problem and was wondering if anyone has replaced the bulbs with anything
> different then the factory bulbs? if so what did they replace them with. any
> part numbers would be great.. also if anyone can give me a part number of a
> bulb through radio shack or an electronics store like that would be great. I
> would like to replace them. Thank you very much.

>                                                     Dustin

They sell a small "grain of wheat" type bulb that could be made to
work. Look for the one that draws 25 ma.  One problem is the original
bulbs don't use wire leads per say. The short leads from the original
bulbs are soldered directly to the board. So you might have to
slightly modify the mounting.  There are 4 bulbs total. Overall, it
might be better to order the yaesu bulbs, if you want it to look
original. The original bulbs have an orange shell. To extend bulb
life, don't turn the display brightness all the way up on the new
bulbs. MK
 
 
 

Yaesu ft2500m bulb failure..

Post by Phil Kan » Fri, 27 Feb 2004 09:30:18


Quote:>They sell a small "grain of wheat" type bulb that could be made to
>work. Look for the one that draws 25 ma.  One problem is the original
>bulbs don't use wire leads per say. The short leads from the original
>bulbs are soldered directly to the board. So you might have to
>slightly modify the mounting.  There are 4 bulbs total. Overall, it
>might be better to order the yaesu bulbs, if you want it to look
>original. The original bulbs have an orange shell. To extend bulb
>life, don't turn the display brightness all the way up on the new
>bulbs. MK

  After 8-10 years of 24/7 use even at the "dim" setting, I've had
  meter bulb burnout in my Kenwood R-5000 and ICOM IC-7000 receivers
  and LCD backlight bulb burnout in the ICOM and Alinco mobile
  transceivers used at the base station.  At least the two "base"
  receivers use seven-segment fluorescent numeric readouts for
  frequency indication and LEDs for other things.

  Replacing them is a JOB, especially since I am partially blind and
  the local repair place will keep the equipment for a month or two
  before they even get around to looking at it.  They replaced the
  bulbs in the Alinco transceiver and the Kenwood receiver with
  "who-knows-what" bulbs that lasted less than 2 years.

  A small penlight shined on the LCD display from the outside shows
  the readout anyhow.

--
   73 de K2ASP - Phil Kane

   From a Clearing in the Silicon Forest
   Beaverton (Washington County)  Oregon

 
 
 

Yaesu ft2500m bulb failure..

Post by Carl R. Stevenso » Fri, 27 Feb 2004 22:55:43


Quote:> Hello, I have a Yaesu ft2500m radio. The bulbs for the display have burned
> out. I have read that other people with the same radio have had the same
> problem and was wondering if anyone has replaced the bulbs with anything
> different then the factory bulbs? if so what did they replace them with.
any
> part numbers would be great.. also if anyone can give me a part number of
a
> bulb through radio shack or an electronics store like that would be great.
I
> would like to replace them. Thank you very much.

>                                                     Dustin

Dustin,

I had several of the panel bulbs burn out on my FT-4700RH - the FT2500M
may/may not use the same configuration.

They were small "grain of wheat" bulbs with wire leads that were enclosed in
orange "***y" covers (a bit hard to get off, but doable), were inserted
into
holes in the pcb facing the front of the radio, and had the leads trimmed
short
and soldered to pads on the pcb (not soldered through holes, just bent over
and soldered to pads).

I used RadioShack SKU# 272-1092  their "#7219 Micro Lamp" which is
rated at 12V 60 mA ... since the FT-4700RH runs the lamps from a series
pass transistor from a 9VDC, you don't get full brightness from the bulbs,
but it seems adequate in the brightest setting of the radio's control.  The
dim mode is dimmer, of course, but that's what you want in a situation where
you're trying not to ruin your night vision.

Again, these bulbs may/may not fit the FT2500M, but you can remove the dead
bulbs and take them to R/S for a comparison.

As I said, removing/replacing the orange *** "boots" is a bit tedious ...
I used
a small, almost needle-pointed set of tweezers to get under the edge at the
base of
the old bulb and worked it around the circumference to help relieve the
friction as
I gently pulled on the closed end of the boot.  Take care not to
puncture/tear the
boots.  Putting them back on was sort of ***-like - basically roll them
on.

Good luck.

73,
Carl - wk3c

 
 
 

Yaesu ft2500m bulb failure..

Post by Mark Kei » Sat, 28 Feb 2004 12:24:21




> > Hello, I have a Yaesu ft2500m radio. The bulbs for the display have burned
> > out. I have read that other people with the same radio have had the same
> > problem and was wondering if anyone has replaced the bulbs with anything
> > different then the factory bulbs? if so what did they replace them with.
>  any
> > part numbers would be great.. also if anyone can give me a part number of
>  a
> > bulb through radio shack or an electronics store like that would be great.
>  I
> > would like to replace them. Thank you very much.

> >                                                     Dustin

> Dustin,

> I had several of the panel bulbs burn out on my FT-4700RH - the FT2500M
> may/may not use the same configuration.

> They were small "grain of wheat" bulbs with wire leads that were enclosed in
> orange "***y" covers (a bit hard to get off, but doable), were inserted
> into
> holes in the pcb facing the front of the radio, and had the leads trimmed
> short
> and soldered to pads on the pcb (not soldered through holes, just bent over
> and soldered to pads).

> I used RadioShack SKU# 272-1092  their "#7219 Micro Lamp" which is
> rated at 12V 60 mA ... since the FT-4700RH runs the lamps from a series
> pass transistor from a 9VDC, you don't get full brightness from the bulbs,
> but it seems adequate in the brightest setting of the radio's control.  The
> dim mode is dimmer, of course, but that's what you want in a situation where
> you're trying not to ruin your night vision.

> Again, these bulbs may/may not fit the FT2500M, but you can remove the dead
> bulbs and take them to R/S for a comparison.

> As I said, removing/replacing the orange *** "boots" is a bit tedious ...
> I used
> a small, almost needle-pointed set of tweezers to get under the edge at the
> base of
> the old bulb and worked it around the circumference to help relieve the
> friction as
> I gently pulled on the closed end of the boot.  Take care not to
> puncture/tear the
> boots.  Putting them back on was sort of ***-like - basically roll them
> on.

> Good luck.

> 73,
> Carl - wk3c

One option I didn't think of at the time...White LED's. I think if I
ever have to do this again, I'm going to switch to the white leds.
They last nearly forever according to the hype. My 706mk2g uses white
led's. Or pretty sure anyway...MK
 
 
 

Yaesu ft2500m bulb failure..

Post by Carl R. Stevenso » Tue, 02 Mar 2004 04:56:31


Quote:> One option I didn't think of at the time...White LED's. I think if I
> ever have to do this again, I'm going to switch to the white leds.
> They last nearly forever according to the hype. My 706mk2g uses white
> led's. Or pretty sure anyway...MK

Mark,

You'd have to do two things ...
first find white LEDs that would fit in the orange *** "boots" (and the
holes in the PCB),
second, you'd probably have to change the (low resistance) series SMT
resistors on the PCB
for higher value ones (unless you found white LEDs that fit AND had
appropriate valued internal
current-limiting resistors ...

73,
Carl - wk3c