[ICOM] WTB: UHF Power Amp Module SC-1054 or M57788

[Clif Holland]

Easy way to try and fix it. Locate the crack. Place the module on a small 
electric hot plate on the lowest setting. After about 10 minutes you can 
almost solder it with a match. Be careful about the heat though the 
substrate will come unsoldered and slide off the heatsink. Don't ask how I 
know. I guess in a pinch you could use an electric stove.

Clif Holland KA5IPF
www.avvid.com




----- Original Message ----- 
From: "Paul Playford" <paul at w8aef.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Cc: <k4idc at comcast.net>
Sent: Friday, September 29, 2006 12:35 PM
Subject: RE: [ICOM] WTB: UHF Power Amp Module SC-1054 or M57788


>I have had success repairing modules that have the components laminated to 
>a ceramic substrate.
>
> It appears the substrate expands (and contracts) at a different rate than 
> the circuitry and the circuit traces have a tendency to crack, creating an 
> open circuit.
>
> Found the crack(s) with an ohm meter.
>
> I used a 150 watt soldering gun to solder a small wire to bridge the 
> crack.
>
> It does take a lot of heat for the solder to flow due to the heat sink of 
> the module.
>
> de Paul, W8AEF
>
>
>> ----Original Message Follows----
>> From: Robin Midgett <K4IDC at Comcast.net>
>> Reply-To: ICOM Reflector <icom at mailman.qth.net>
>> To: icom at mailman.qth.net
>> Subject: [ICOM] WTB: UHF Power Amp Module SC-1054 or M57788
>> Date: Fri, 29 Sep 2006 08:43:24 -0500
>>
>> Hi,
>> I need an Icom SC-1054 UHF power amplifier module to repair an Icom 
>> IC-901. It is the same as a Mitsubishi M57788. I'm seeking a organ donor 
>> radio from which I can extract this part..new ones are a bit too 
>> expensive.
>>
>> Thanks,
>> Robin Midgett K4IDC
>
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