[ICOM] IC-765 on 220 VAC

[Mike Thornton]

Gary, you seem to know the IC-765 PS pretty well. 
Maybe you can answer a question for me.  When I got
into my PS last weekend to re-solder the copper strip,
I took the four screws out of the solid state devices
that were screwed down to the chassis so that I could
lift up the circuit board.  Two of the screws were
metal and two were plastic.  I noticed that there was
a grey plastic sheet between the four devices and the
chassis.  This struck me as odd.  I would have thought
that these would have been screwed down directly to
the chassis with heat-sink grease between them and the
chassis.  I am just trying to figure out if my PS is
normal or if it has been "messed with" prior to my
ownership.  Any help is appreciated.

Thanks,
Mike, WC0L

--- Gary Fiber <gfiber at comcast.net> wrote:

> Hi Tim,
> 
> Going from memory.......
> Get the electric screwdriver warmed up.
> 
> Remove the power supply from the 765.
> Remove the bottom cover, about 20 screws.
> Take note of the transistors and insulators, remove
> the mounting 
> screws from them and circuit board from the power
> supply case.
> Look and you will see two jumpers that are marked
> 110 / 220. Move 
> each jumper to 220 Volts, Requires soldering.
> Under the Full Wave bridge there is a jumper that
> connects the AC 
> inputs together, cut it. Try to leave enough so you
> can revert back 
> to 110 Volts if desired.
> While you have the board out inspect the current
> shunt resistor, 
> about 1.5 inches long by 1/4 inch wide flat bar on
> the bottom of the 
> circuit board.
> If the solder joints are cracked or look bad, de
> solder, clean up 
> area and reinstall the current shunt resistor. Do
> not solder past the 
> holes in the resistor.
> Reassemble the power supply, maybe using some new
> grease under the transistors.
> Reinstall it into the rig
> Change the plug on the end to a proper 220 Volt
> plug.
> 
> Praise the good job the electric screwdriver did :)
> 
> Enjoy.
> 
> I think mods.dk has this on it
> 
> Gary K8IZ
> 
> At 01:40 PM 6/28/2006, you wrote:
> >Has anyone ever done this?
> >I see some schematic notes in the service manual,
> but no step by 
> >step procedure.
> >Any help would be appreciated.
> >Thanks and 73,
> >Tim K3LR
> 
> Gary Fiber K8IZ
> GROL PG-19-6691
> Washington State Resident
> 
> 
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