[Icom] Need Help with IC-451A

[daveg]

Mike -

I have a 251A, the 2-meter version of that rig.  There needs to be a 
jumper plug in that 4-pin jack for it to run on the internal 110V 
supply, or you can run it from 13.8 V from that jack.   Last I knew, 
Radio Shack stocked the 4-pin 'molex' plugs.   The 110V supply in mine 
failed a few years ago, and this isn't the most reliable part of the 
radio.   And no jumpers are needed on that large multi-pin connector.

To run it from external 13.8 VDC,  + is the pin on the triangle-shaped 
end (right side, looking at the rear panel of the rig), and - is the pin 
on the left side, and the two center pins are not connected.   To run 
from the internal supply, there is a jumper from the pin at the 
triangle-shaped (right) end to the one next to it.
                            ______
                          | 4 3 2 1 >
                           --------

In my crude attempt at drawing the connector,  jumper 1 and 2 together 
for internal supply operation.
For external 13.8 VDC, 1 is positive and 4 is negative.

The internal supply uses a 2-amp fuse in the internal fuse holder.  The 
external DC cord had 5-amp fuses in it.

73's
Dave, N2EPV

Mike Baker K7DD wrote:

>Hello there,
>	I just picked up a used (little did I know how used) IC-451A off E-Bay.
>Looks ok on the outside, but when I hooked up AC power, NADA.  The DC
>connector is one I don't have in my box of tricks yet so I opened it up to
>look around.  Some of the coil slugs look like they have been adjusted (PLL
>readjust perhaps) but I'll cut to the chase.  Is there a jumper used on the
>DC connector when you use the AC supply?  I ask because there are 4 wire
>connected to the 4 pins so I was wondering if there was a jumper between the
>middle two when on AC?  That would account for the AC supply not working at
>this point.  ALso, there is an UGLY large multipin molex connector for
>accessories.  Is there supposed to be a jumper plugged into it during normal
>opperation?
>

>  
>