Northern Telecom Meridian SL-1 Reference Manual page 10

2-6 Fault detection and locating
2-Mb/s Remote Peripheral Equipment
Table 2-B (continued)
Fault indications and possible causes
Corresponding breaker on QUX20 unit must be set to OFF before
removing or inserting a QPC706 converter.
Fa ult in di cat io n
DC ON LED
extinguished
LED lit on Power
Fail Transfer Unit
(PFTU)
—co nt in ued —
CAUTION
Po ssib le cause
Check commercial ac power supply.
Check DC BRKR on QBL24 battery box (if equipped).
Check F1 and F2 fuses (if equipped) on -48 V rectifier.
If blown, replace rectifier.
At local end, load program 35 and enter command
CMAJ.
If fault does not clear, check the following.
1) Cable on faceplate of PFTU and ensure that it is
secure.
2) Check transfer switches on underside of all
consoles.
3) Check P10 cable connections at cross-connect
terminal.
4) Check wiring to all consoles.
5) If fault persists, replace PFTU.
Appendix 1 to 553-2741-500