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.
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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
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1. In control RRC
Solder a short wire in place of missing zero ohm surface mount resistor, marked R40 in the picture below.
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2. In Radio RRC
Solder a short wire in place of missing zero ohm surface mount resistor, marked R18 in the picture below.
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To conclude
– 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