[ICOM] IC-207H Fan Always On???

[Stephen Budensiek]

Hello,
   It's been a few years since I had a 207 (I now have 2 IC2720).   My
memory is weak on the 207, but it may have a common wideband driver
and power output device.   The first thing I'd do is check the keydown
current pull on 2m and 70cm.   If you have about the same current draw
(slightly more on 70 cm), but no RF output on 2m, take a hard look at
the switching PIN diodes.   I had the same thing, and one of the PIN
diodes on the 2m side was gone.   Have seen this situation in several
Icom mobiles across the last 15 years.   I use a desk power supply
with current and voltage meters, makes it easy to troubleshoot this
problem.

73's de Stephen, K0SD in FL

******************************

On Wed, Apr 9, 2008 at 4:04 AM, Michael Crestohl <W1RC at verizon.net> wrote:
> I picked up an IC-207H at a swap meet last weekend.  The former owner told
> me that the "finals were blown" and was priced accordingly.
>
> Cursory examination shows that it seems to work fine on UHF but there is no
> RF output on 2m.  The RF output indicator indicates the radio is
> transmitting but my Bird 43 shows otherwise.
>
> I'll dig into it when I have time but I noticed that the cooling fan is
> always on.............even when the radio is switched OFF.  Too say the
> least I find this annoying and am wondering if this was a mod performed by
> someone other than the factory.  I cannot see this as a malfunction but want
> to reverse it.
>
> Does anyone on this List have any knowledge of this mod?  Anyone replaced
> the VHF RF amp transistor and possibly know the OEM part number?  Please
> copy me on any replies as I do not always read the digests as I receive
> them.
>
> 73,
>
> Michael, W1RC
>
> w1rc*at*verizon*dot*net
>
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