[time-nuts] Repair of 5370B input channels

[Jim Miller]

Hi,

I recently acquired two 5370B counters with bad input channels.  One  
has a bad start channel,
the other a bad stop channel.  I have traced the problem to the input  
board A3, which is the board directly behind the BNC connectors on  
the front panel.

Has anyone had any luck repairing the input circuitry in these  
units?  Is there a common failure mode that occurs when signal levels  
are exceeded?

Thanks in advance.

Jim Miller
N8ECI