[ICOM] IC-765 question

[Gary Fiber]

We always used Icom parts. You might check with Scott Malcom of Malcom Technical Support. He does a lot of service on the older Icom radios. I am not sure Icom still has parts, but I would give them a call. I think the N-110 was Neon type of opto isolator or similar circuit, it is in the power supply start up circuit. Scott may have another source for them, if Icom does not have the actual part. He may also some idea as to the slow start up of the power supply. I don't have Scott's number or email handy but a Google search or look on eham.net will turn up his information.

Gary P. Fiber K8IZ



> On Apr 25, 2015, at 9:32 AM, Marc & Tricia Niebergall <mtniebs at gmail.com> wrote:
> 
> Gary,
> 
> IC-1 is listed as a photo interrupter n110.  In case that is the guilty
> component, is there any way I could get an equivalent part from Mouser? I
> don't know much about solid state electronics, so this is a bit confusing
> to me. R-5 checked out exactly at 3 ohms, so that appears to be good. I
> have made the adjustments listed for the 13.8 voltage (R-14), but the R-19
> adjustment does nothing (at least on my digital voltmeter).  I made the
> adjustments with the power supply connected to the radio instead of
> isolated with the 300w rheostat connected.  Don't know if that has any
> bearing on the testing or not.
> 
> Marc
> 
>> On Sat, Apr 25, 2015 at 8:31 AM, Gary Fiber <gfiber at comcast.net> wrote:
>> 
>> Look here http://www.ab4oj.com/icom/ps35/main.html
>> 
>> Grab the PS-35 user manual  PDF. IC1 and R5 used to be problematic in those
>> supplies too. R5 might have changed value, it is a current limiting
>> resistor. IC1 would not fire off all the time as I remember. If you look
>> through this manual and see the voltage change on the PCB layout, that is
>> my
>> hand writing hahaha. Funny to me to see my hand writing all over the net.
>> 
>> Others here are more familiar with this supply than I am anymore, left Icom
>> in 2001 so daily tech support is history.  When I was there 80 telephone
>> support calls a day on all of their products combined was normal. My ear
>> was
>> tired at the days end ;)
>> 
>> Gary K8IZ
>> 
>> 
>> 
>> 
>> -----Original Message-----
>> From: Icom [mailto:icom-bounces at mailman.qth.net] On Behalf Of Marc &
>> Tricia
>> Niebergall