Spacelabs qube 91390, Service Manual, Page: 46 / 160

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9 1 3 9 0
Q U B E
T
H E O R Y
Battery Charger and Power Supply Subsection
(on CPU PCB)
Figure 3-4 Power Supply Subsystem
The Power Supply and Battery Charger subsystem (refer to
Figure 3-4 ) consists of several subsystems:
• Always On (AO) MCU that provides ON/OFF control
• Battery management / charging control
• Voltage monitoring
• PWM for backlight
• Power sequencing
• Unit shutdown warning (PFAIL)
• Internal temperature monitoring
• Control of +12V, +5V, +3.3V, -12V power supplies
To show and monitor the supply voltages, open the Biomed menu,
click the System Info tab, then select the Analog key. If out of range
conditions are presented, voltages are checked at power-on, and
during run time and events are logged.
P/O CPU
PCBA
670-1573-xx
BACKLIGHT
J40
J9
INPUT
SELECT
DC_IN
BATT A
BATT B
3.3VAO
“ALWAYS
ON”
BATTERY
CHARGER
CPU
“ALWAYS ON”
CPU
CONTROL
BAT1_CH_LED
MAINS_LED
PWR_ON_LED
SW_PWR
RKEY
FP LEDs & IR
J50
BAT2_CH_LED
+3.3VAO
FET
SWITCHES
CH_LED2
CH_LED1
+3.3V
DC_IN
+18V BOOST
+5V / +3.3V
BUCK
-12V INVERT
+12V/+12V_REC
BUCK-BOOST
+5V
EN_3V
EN_5V
EN_18V
EN_12V
VCOM
EN_INV
+18V
+3.3V
-12V
+12VREC
+12V
EN_18V
EN_5V
EN_3V
EN_INV
EN_12V
VCOM
FAN
VCOM
FAN_CTL
VCOM
VCOM
VCOM
VCOM
+12V
+3.3VAO
J8
FAN_CTL
BL_PWM
+12V
BL_PWM
+5V
TO LCD/ BEZZEL ASSY
TO FPGA PLD
TO
L
C
D
/ B
E
ZZ
E
L
A
S
S
Y
+3.3VAO
+3.3VAO
DC_IN
DC_IN
PWR_RX_TX
TO
MAIN
CPU
ANY_PWR_IN
TO SYSTEM
FAILURE ALARM
PFAIL
WD_PWR
TO SYSTEM
FAILURE ALARM
TO/FROM
MON-DOCK PCBA
BATTERY B BATTERY A
J9
P401 P402
BATTERY CONNECTOR PCBA
670-1555-xx
WD_PWR
WD_MAIN
SYSTEM FAILURE ALARM
ANY_PWR_IN
FROM MAIN CPU
FROM P.S. “ALWAYS ON” CPU
PIEZOELECTRIC
BUZZER
FET
+5v
REG
ONE-
SHOT
ONE-
SHOT
SUPERCAP
V_ALARM
DUAL-
FREQUENCY
OSCILLATOR
670-1573-
03
and later
CPU PCBA only