[ICOM] IC-207H blown UHF module--Questions

Bill NY9H ny9h at arrl.net
Mon Mar 3 09:00:54 EST 2008


just a thought ,

i have had several VHF modules that the ceramic substrate cracks, 
opening up one or two circuit board traces,,, AND  by solder flowing 
across the lans brought the module back. Years later it  failed 
again, this time i put a small wire across the "bridge" and it's been 
working for years...  worth checking...you need a jeweler's loupe or 
strong magnifying glass...to search for the crack...
but then again maybe it is blown...

gud luck

bill


At 09:12 PM 3/2/2008, you wrote:
>I have an IC-207H with a blown UHF power module. Been using the radio for A
>few years on 2 meters but finally got around to opening the radio up. Trying
>to figure out what happened.
>
>On 2 meters, the radio, if running into a bad antenna would sometimes lock
>up on transmit. Wonder if this happened on UHF and cooked the module.
>
>On removing the UHF module, the module heat sink surface is discolored
>around the output pin for 1/4 inch. Also, there was no thermal grease on the
>modules--is this normal?
>
>On to checking the PIN diodes--first check indicates they have to be checked
>out of circuit--either that or they are bad.
>
>Of course its one of the more expensive modules--about $100.
>
>If anyone has gone through this, any hints or experience would be
>appreciated. Thanks in advance. --Mike, WV2ZOW
>
>----
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