F
RONT
-P
ANEL
O
PERATION
The LPS-APU front panel is shown below. Functional descriptions of its indicators and
controls are listed in
Yes
*Refer to the appropriate unit user manual for an
explanation of front-panel indications and Craft
interface screen content.
LPS-APU
Critical,
Major, or
Minor
alarm?
Access Craft interface
Shelf
Status screen or view unit
front panels to determine
which card failed.*
Reseat
LPS-APU.
Condition(s)
still exists?
Yes
Replace
LPS-APU.
Yes
Problem
resolved?
No
Call ADC (see Technical Assistance
information on back cover).
No
STOP!
Yes
STOP!
Access Craft interface
Display
Active Alarms screen to determine
unit and cause.
Access Craft interface
unit status screen for
detail of problem.*
OR
Cannot generate
any visual or
audible alarms?
No
No
STOP!
Refer to module
troubleshooting procedure
for additional information.
OR
S0278-A
LPS-SCU Troubleshooting Flowchart
CR
APU
MJ
MN
ACO
PWR
HSKP
RMT
ALM
LMPTST
DISP RMT
Critical alarm LED
Minor alarm LED
Major alarm LED
Alarm cutoff pushbutton
Power LED
Housekeeping LED
Remote alarm LED
Display remote pushbutton
Lamptest pushbutton
S0277-A
Table 1.
LPS-APU Front-Panel Operations
Indicator
Description
CR LED
Red
Critical alarm exists on the system.
MJ LED
Red
Major alarm exists on the system.
MN LED
Yellow
Minor alarm exists on the system.
ACO LED
Green
Some active audible alarm are being suppressed.
PWR LED
Red
One of the power feeds is out of operation.
Green
Normal operation.
Off
Power is off.
HSKP LED
Yellow
Housekeeping alarm is active at the near end.
RMT ALM LED
Yellow
Remote alarms exist on the system.
Control
ACO pushbutton
Active audible alarm indication is turned off when pressed.
DISP RMT pushbutton
Local line units display the state of the LEDs on the remote line units, if supported.
LMPTST pushbutton
Tests all LEDs in the chassis when pressed.