Specifications

SQ: 6-23
RS3: Service Quick Reference Guide
ControlFiles
Controller Processor LEDs and Test Points
LED
Meaning and Response
5VFuseBlown
(DS3)
Replace Fuse F4 (Supplies 5 VDC to the Contact Processor).
Card Fault
(DS2)
A fault has been detected on the Contact Processor, or the
ENABLE/DISABLE Switch is in the DISABLE position.
If the switch is enabled and this LED is on, replace the Contact
Processor.
Card Enable
(DS1)
The ENABLE/DISABLE Switch is enabled and no hardware
faults are detected on the Contact P rocessor.
Block Evaluation
(DS8)
The microprocessor is evaluating an input or output block. With
redundant Contact Processors, this LED indicates the active
card.
CP Access
(DS7)
The Coordinator Processor is accessing the Contact Processor’s
RAM memory and transferring configuration and dynamic data to
the NV Memory. If the Contact Processor loses memory, current
data is quickly reloaded from NV Memory.
Interrupt
(DS6)
The Contact Processor is resetting its watchdog timer to prevent
timing out or to acknowledge the synchronizing clock pulse.
Test Point Function
Yellow +5 V (± 0.1 V)
Brown Ground Return