User Manual

CTI Products, Inc. NCB/IM User Guide
Appendix E. Troubleshooting 43
Table E5
If the ACT LED (on local
NCB) . . .
REASON
CORRECTIVE ACTION
Occasionally blinks on, then
off.
Normal operation indicating a message
packet has passed through the router
module of the NCB.
Go to next Table.
Does not illluminate when
“RSVC” button on remote
NCB is pressed.
1. LONWORKS Service Pin message from
remote NCB is not reaching the local
NCB.
2. LONWORKS Service Pin message from
remote NCB is not passing through the
local router module.
1a. Verify that “ACT” and “ERR” LED’s
on remote NCB flash once. If not,
return remote unit for
evaluation/repair.
b. Verify that “OH” and “CD” LED’s are
both illuminated on the local and
remote NCB’s. (See above)
2a. Place the remote router in Repeater
mode and verify that the local “ACT”
LED illuminates when “RSVC” button
on remote NCB is pressed.
b. If ‘2a’ is ok, re-commission the local
NCB router.
c. If ‘2a’ is not ok, swap either the local
or remote unit with a known-good-unit
to determine the faulty unit.
Does not illuminate when
local LONWORKS nodes
are transmitting messages.
1. LONWORKS message packets from
local nodes are not passing through the
local router module.
1a. Verify the connection between the
local LONWORKS nodes and the local
NCB.
b. Place the local router in Repeater mode
and verify that its “ACT” LED
illuminates when local LONWORKS
nodes are transmitting messages.
c. If ‘1b’ is ok, re-Commission the local
NCB.
d. If ‘1b’ is not ok, return the local NCB
unit for evaluation/repair.
Does not illuminate when
remote LONWORKS
nodes are transmitting
messages.
1. LONWORKS message packets from
remote nodes are not passing through the
remote router module.
2. LONWORKS message packets from
remote nodes are not reaching the local
NCB.
3. LONWORKS message packets from
remote nodes are not passing through the
local router module.
1a. Verify the connection between the
remote LONWORKS nodes and the
remote NCB.
b. Verify that “ACT” LED on remote
NCB illuminates when remote
LONWORKS nodes are transmitting
messages.
c. Place the remote router in Repeater
mode and verify that its “ACT” LED
illuminates when remote LONWORKS
nodes are transmitting messages.
d. If ‘1c’ is ok, re-comminssion the
remote router.
e. If ‘1c’ is not ok, return unit for
evaluation/repair.
2. See this Table above and verify that the
“ACT” LED “Does not illluminate
when “RSVC” button on remote NCB
is pressed”.
3. See this Table above and verify that the
“ACT” LED “Does not illluminate
when “RSVC” button on remote NCB
is pressed”.