GE Datex-Ohmeda Aisys Carestation Reference Manual page 40

Aisys
2-8
The remaining LEDs are status indicators:
• Battery Connected: is turned on and off by a time-delay circuit on the POWER
CONTROLLER BOARD. Evidence of this is to disconnect AC Mains and place the unit
in the Standby position. The fans will run for several seconds (on battery) until the
battery is disconnected.
• CPU: The CPU Led should flash at a 2 Hz rate when application is running in the Power
Controller Board. It will be dimly lit (or fast flashing) when Boot Code is running. If the
CPU LED is not lit, then either NO power (28 VDC from U-Frame and Battery) or No
Boot Code in the board. In the event of absence of Boot Code, the board needs to be
replaced.
• Note: The CPU Led flashing at the 2 Hz rate indicates the watchdog circuit is
functioning.
• XMIT: Flashing of the XMIT LED indicates communication is being sent to the Display
Unit (DU). The Power Controller Board only communicates to the Display Unit when
asked to by the Display OR the Power Controller has encountered an error or alarm. It
will mostly remain off.
• RCV: The RCV LED flashes when the Display Unit communicates with the Power
Controller Board. RCV LED will be on solid if not connected to or not communicating
with the Display Unit.
There are four field replaceable fuses on the Power Controller Board. They are
automotive type fuses and can be purchased locally.
• FH1: 15 A (32 VDC) –
Battery Backup for the AM Monitor
(Smart Switch for S/5 Monitor).
• FH2: 15 A (32 VDC) –
Machine Battery charging circuit.
• FH3: 15 A (32 VDC) –
Machine Battery.
• FH4: 5 A (32 VDC) –
Display Power
(Note: Silk screening indicates "15A")
RCV
XMIT
CPU
FH1
15A
BATT
CONN
FH4
5A
FH3
15A
FH2
15A
04/08 M1046983