[amsat-bb] Maintenance depot or individual to repair an ICOM IC-821
Edson W. R. Pereira
ewpereira at gmail.com
Mon Feb 12 13:38:57 UTC 2018
Ask the person realizing the repair to check Q42 and Q43 (RN2425) in the
main unit. Many IC-821H presented a problem with low power, including mine.
The problem is normally due to a partial damage of Q42 and/or Q43
transistors in the power control circuits (for both VHF and UHF). It is
advisable to replace both transistors by a part that can tolerate higher
power levels. A p-channel switching mosfet can do the job.
73, Edson PY2SDR
On Sat, Feb 10, 2018 at 10:28 PM, Mac A. Cody <maccody at att.net> wrote:
> A fellow ham in my radio club has an ICOM IC-821 that has developed
> a problem. The transmit power on 2M has dropped from its nominal 45 Watts
> to 18 Watts. He has already attempted to obtain service through ICOM and
> some other repair services without success. Is anyone aware of a repair
> outlet or an individual that is knowledgeable of the IC-821 in order to
> perform repairs?
> Mac Cody / AE5PH
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