Icom HM-133 Schematic, hope this helps!

http://www.mods.dk/downloadmanual.ph..._Schematic.zip

http://www.icomamerica.com/support/d...icrophones.asp

73's

"Paul" wrote in message
...
Hello,

I picked up an HM-133S MIC on eBay and the vendor stated that it works
with
my IC-2100H. Although the LED on the MIC comes on I can not command the
radio. I tried unlocking the MIC (FN+16) but no dice -- any
suggestions/thoughts?

Thanks!

-Paul, KN6PH