Johnson Controls CK721-A - Page 198

Maintenance CK721-A Installation and Operation
5-4 24-10349-8 Rev. B
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PIN Code function not
operating
 PIN is not programmed as part of the access
condition
 Broken wire or incorrect wiring from the keypad
to PCBA
 Defective keypad
Card or data loss from
database
 Noise on power line
 Improper grounding
 Defective CK721-A
System restarts
continuously
 System improperly grounded
 Severe power variations
 Defective CK721-A
Red or Green lamp does
not illuminate, but access is
denied or granted if card is
used.
 Open wire at lamp connection
 Burned out lamp bulb
 Defective reader terminal
Holiday time zones not fol-
lowed
 Improperly programmed Holiday time zones or
Holiday dates.
Table 5-2: Troubleshooting Guidelines
Problem Possible Causes