CTI Products CCU Channel Control Unit - Manual (Page 22)

CCU Hardware Reference Troubleshooting
CTI Products, Inc.
68-11843-105
16
8. Troubleshooting
This table is a list of troubleshooting tips specific to the CCU module. For
additional troubleshooting tips, refer to the troubleshooting section found in the
Monitoring and Control Network System Manual, reference 1.
Due to the high percentage of surface-mount components, the CCU is treated as a
field replaceable unit. If any system problems are the result of a malfunctioning
CCU unit, the entire unit must be replaced and returned for repair.
PROBLEM CAUSE
Signals do not toggle Verify that the appropriate inputs are going to ground. If you are
using relay contacts to drive the Toggle inputs, be sure the
common side of the relay contacts are grounded and connected to
Pin 1 of the CCU.
TX ECS doesn't change when
TX ECS Toggle inputs are
changed You may have TX ECS slaved to RX ECS. Check Option
Switch 1.
Can't enable the Repeater
from the PC or with the Rpt
Toggle inputs. You may have Force Repeat enabled. (Switches 2 & 3). If so,
when the Rx ECS Select or the TX ECS Select is active, you will
not be able to turn the Repeat On until the RX and/or TX ECS is
turned off.
TSAM not switching audio
outputs Be sure that /TXS1, /TXS2, /Force Sel, and Ground are
connected to the TSAM and are acting properly..
Data from CCU changes,
when I/O lines are static You probably have multiple CCUs programmed for the same
Group/Module address. Reset the addresses and reset the
appropriate CCUs.
For instance, one CCU may have Comparator A selected and
another may have Comparator B selected. You will see the
indication change between Comp A & Comp B.
The ACT LED on the CCU is
off This is a normal condition if there is no PC accessing the CCU at
any given time.