[ICOM] IC2100H

[Henry Pfizenmayer]

Hi Jim -- I have a weird situation with my Grandson's IC2100 which I can 
compare with my IC2100.

1. His "Bad IC2100"  - the HM98 mic it came with will not key the 
transmitter anymore. The HM133 mic that came with with my IC2100 keys it 
fine and modulates fine.

2. The HM98 mic which will not key the "bad IC2100" will key my IC2100 fine 
and modulates fine.

 3. Both rigs key fine if you short the normal PTT line to ground.

4. I made up a cable so I could measure the open circuit voltage from the 
mic plug on both rigs .Both rigs measure the same open circuit voltage on 
every line within a tenth of a volt.

 5. Like yours , the buttons appear to work , just won't key - I did not do 
an intensive check of every function.

 Have not found anyone who has any idea what is going on here - but see 
little point in taking it to a ICOM service place because the answer will be 
obvious I suspect - Bad Mic . But how come it works ok on another 2100 ????

Oh Well -- Rgds-- Hank - K7HP





> While on way to work today, the 2100 mobile stopped transmitting. NO 
> indication of radio going into transmit at all instead of no output. 
> Thinking perhaps it is a mic problem but at work unable to try another 
> mic. Guess the mic from a 207 will at least key it up. Just wondering if 
> anyone would have experienced this before.