[Icom] re defective PS-35 switching ps

Wed, 05 Mar 2003 14:12:55 -0700

Hi,
That 0.1 Ohm resistor(bar) can loose good solder joint due to heat.
Capacitors are always troublesome. I replaced all in mine as a prevention of
possible trouble.
73,
Tony, VE6CGX

Larry wrote:

> My IC-765 started acting somewhat as you describe but it was doing it 
> constantly. The Icom web-site directed me to resolder he current sense 
> resistor - it's actually a bar. It took quite a bit of work to get to 
> it but after all the effort, the problem was fixed.
>
> 73 - Larry W�NFU
> [email protected]
>
> At 05:05 AM 3/5/2003 -0500, you wrote:
>
>> "usually"is vague, but many times the series-pass regulator transistors
>> go bad from excessive load cirrent. These are probably two large
>> BJT's mounted on a heat sink. They are in series with the load current.
>> A schematic would help you a lot. Sounds like one is good and one
>> is bad from you description of trouble.
>>
>> Larry,  K4WLS
>>
>>
>> ----- Original Message -----
>> From: "Fern Rivard" <[email protected]>
>> To: <[email protected]>
>> Sent: Wednesday, March 05, 2003 1:34 AM
>> Subject: [Icom] re defective PS-35 switching ps
>>
>>
>> I have a friends IC-745 which has a bad PS-35 power supply in it as it
>> crashes under load when loading to more than say 30 or 40 watts!  What
>> normally goes bad in these switching type of power supplies?  73 from 
>> Fern
>>
>> PS The radio works fb on my external power supply.
>>
>> ----
>> Your Moderator: Dick Flanagan W6OLD, [email protected]
>> Icom Users Net: Sundays, 1700Z, 14.315 MHz
>> Icom FAQ: http://www.qsl.net/icom/
>>
>> ----
>> Your Moderator: Dick Flanagan W6OLD, [email protected]
>> Icom Users Net: Sundays, 1700Z, 14.315 MHz
>> Icom FAQ: http://www.qsl.net/icom/
>
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
> Icom FAQ: http://www.qsl.net/icom/
>