A very few sets of the first production batch from 2009 had this error, and all customers which had units with this error are informed individually by email.
We have found out that in one batch of the RRC-1258MkII there has been
an error in the SMD process (Surface Mount Devices).
The 0 ohm jumpers (R18 resp R40) which should connect COM-2 Pin 5
to electrical ground is exchanged between the Control and Radio, meaning that Pin5 is not
connected to electrical ground in either Control or Radio Box.
In most cases COM-2 is working anyway, it has to do with how the grounding is done in the
equipment connected to the RRC:s
Anyway the solution is very simple and I recommend everyone who use COM-2 to make the modification
1. In control RRC
Solder a short wire in place of missing zero ohm surface mount resistor, marked R40 in the picture below.
2. In Radio RRC
Solder a short wire in place of missing zero ohm surface mount resistor, marked R18 in the picture below.
– R18 should be mounted in Radio RRC
– R40 should be mounted in Control RRC
– Both can also be mounted without problem
R40 should be mounted in