Unit Not Detected - Fujitsu Airstage J-II Service Manual

7. System Controller (UTY-APGX) / Service Tool (UTY-ASGX) / Web Monitoring Tool (UTY-AMGX)
(Referred to as "Service Tool" hereafter)
Trouble shooting 84
Error Contents :

Unit Not Detected

Details :
Condition of occurrence:
Unit address is not set correctly.
Network cable is not connected correctly.
System design is mistaken.
Unit transmission board is defective.
Cause 1 : Unit address is not set correctly.
Check the unit address setting of the undetected unit and correct it if mistaken.
OK
Cause 2 : Network cable is not connected as designed.
Check that the network cables are connected according to the site design drawing.
Check specifically the network segment where the undetected unit exists.
Check and fix the loose cable connection to the terminal of the undetected unit.
Using Service Tool, perform scan changing the network segment where the Service Tool is connected and localize
the mistaken network segment. Start from the network segment where the undetected unit exists.
Specify priority scan when possible.
OK
Cause 3 : System design work is mistaken.
Check the following items and fix appropriately if mistaken.
(1) 1 (and only 1) Terminal Resistor is connected for each network segment.
(2) Cable length is within 500m for each network segment.
(3) Number of units connected within a network segment does not exceed 64.
(1 connected port of Signal Amplifier is counted as 1).
(4) Network cable specification is as specified in the Design & Technical Document.
(5) Total number of Signal Amplifiers does not exceed 8 per system.
(6) Network cable is not connected in loop.
(7) Both ends of the network cable are grounded.
(8) Network cables are not bundled together with power cables to prevent noise induction.
OK
Cause 4 : Unit transmission board is defective.
Replace transmission board of the undetected unit if none of the above cause applies.
Symptom :
1 or more units (but not all) are not detected after Scan.
1 or more units (but not all) are not listed in the system list after Scan.
Recovery condition:
Unit address is set correctly.
Network cable is connected as designed.
System design and work is corrected.
Unit transmission board is normal.
Note :
A Network Segment is a portion of the network
connected directly by network cables and is
separated by Signal Amplifiers. If no Signal
Amplifier exits, there is only 1 network segment.
04-82