using icom internal power supply as an external ps?
 

Hi,
I have been given an ic745 internal power supply.
I was wondering if i can use it as a stand alone external one.
it has the standard 6 way power connector with 2x positive and 2x negative
outputs.
but it also has 2 other wires to the plug. (i presume these are a switch on
sensor?)
If i apply mains to the unit there is no output so I will need some way of
imitating the power on switch on the rig it is from.
Any help gratefully accepted. Bob.

Bob,

If you hunt about the Internet, you may even be able to find a pdf service
manual for this rig.

I agree you can probably use it for a general power supply. There's a caveat
of two, however. 50% duty cycle, so says the service manual. Also, there
may be an issue of minimum loading for any switching power supply; you may
want to add say a resistor or 12 V light bulb for say a 1 Amp load, though
there's nothing in the manual that mentions min load. A quick look of
the rig specs didn't reveal a current draw of the IC745 on receive.

Bob G0KYF wrote:

Hi,
I have been given an ic745 internal power supply.
I was wondering if i can use it as a stand alone external one.

According to the hard copy service manual I have for my IC745,

Input Voltage: 110/220 AC 50/60 Hz +/- 10%
Input Capacity: 550VA @ 20A
Max Load 20A: 10 mins ON/10 mins off

Fuse 10 A, 110 and 5 A for 220.

it has the standard 6 way power connector with 2x positive and 2x negative
outputs.
but it also has 2 other wires to the plug. (i presume these are a switch on
sensor?)

Yes, the schematic shows this going to a simple switch. Short pins 3 & 6 to
turn on.

Pin out
1 4 13.8 Volts
2 5 GND
3 6 "AC 1 & AC 2"

If i apply mains to the unit there is no output so I will need some way of
imitating the power on switch on the rig it is from.
Any help gratefully accepted. Bob.

The manual also mentions automatic 25 A current limit, turn off to reset.

Good Luck, Steve

Steve wrote:
I agree you can probably use it for a general power supply.

I have done this. (OK, I think the supply came out of a IC-271H) If I
recall properly the load was a TS-130 and it worked fine.

Unfortunately that was 20 years ago and I don't remember the wiring.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com