GE Datex-Ohmeda S/5 - Page 228

Datex-Ohmeda S/5 Anesthesia and Critical Care Monitors
6
Document no. M1125635-05
Service reset button
Service reset button is for service purpose. Press this button with an appropriate tool for at
least five seconds before you remove any PC board or the Power supply unit from the rear of
the Central Unit.
Before connecting the power cord back and start monitoring, be sure that at least one minute
has passed after the service reset button was pressed. Too short time may lead to memory
flaw.
Audible alarm for power fail
Inside the Power supply unit there are two dip switches. By turning the switches up the audio
alarm is activated. When mains power fails the audio alarm is powered from the lead-acid
battery.
+32 VD switch
This short circuit protected circuit connects the dirty +32 Vd voltage.
Figure 5 Power supply board block diagram (F-CU8, rev. 12)
Battery switch
connector 2,
control
Power Logic Board
F1
F2
32 Vd
+5,1 V
+5 Vcpu
-15 V
ON/STBY
Audio Out
Fan
Mains Transformer
connectors
Battery
switch
connector 1,
power
+15 Vd
32 V
32 V
32 V
X1
X4
X6
X4
X7
X5
6
X3E 2, 4
X3A 2, 4
X3C 8
X3A 6, 8
X3A 32
+15 V
X3C 10
X3A 14
X3E 32
32 V
RESET_CPU
X3A 10
POWER_FAIL
X3A 12
REFRESH_WD
X3C 12
RESET
X3C 14
1
3
1
2
1
2
3
4
3 N/C
Fan +
Fan -
T10A
F2A
Power Supply Board
X5
5
X5
4
X5
24
X5
3
X5
8
X5
23
X1
X5
7
AUDIO_IN
X3E 12
Audio Out +
Audio Out -
X5
9
Preregulator
(Described in
the Power Logic
Board Section
fcu8_power_supplybrd_diag_rev_10.vsd
2
4
1
2
3
4
5
6
1, 2
3, 4
+15 V
converter
+5 V
converter
+5 Vcpu
& -15 V
converter
X2
CPU battery
Service reset