HP 9020 - Page 31

AC
IN
FF
WITCH
~EAKER
ACMODULE
CESSOR
I/O DOOR OR PRO
STACK DOOR 0
PEN
I I
I
PROCESSOR
TEMPERA
STACK'
TURE
/
+lbV
BIAS
SUPPLY
@
I
I
PRIMARY BOARD
MAIN POWER
I
RECTIFIER AND
SWITCHING
TRANSF~
~r-?+5V
CAPACITORS
REGULATOR
I~
+5V
SWITCHING
SAFETY
I~
SUPPLY
1
DISCHARGE
~
~
6
9
:.;
n
I~ T
1)-
I
t
W
H0
n
PEAK
LOW LINE
POWER
MONITOR
DETECTOR
e-
BASE
DRIVE
1
e-
PULSE WIDTH
FEEDBACK
MODULATOR
PWM ENABLE
-
1
I
I
I
LOW LINE
I
LEVEL COMPARE
START UP PULSE
+5V
GENERATOR REGULATOR
30KHz CLK
~
r-L-/
LOW LINE
TEMPERATURE
L,
MONITOR
OVER TEMP
.
SECONDARY BOARD I
-1
+12V
,
SUPPLY
'1
+19V
"
-19V
~
FULL-BRIDGE
'1
RECTIFIER
H .,~
SWITCHING
~
SUPPLY
'I
H .'V
SWiTCHING
~
SUPPLY
'I
Y
+3V
SWITCHING
,
SUPPLY
'I
H'2V
,
SWITCHING
/
SUPPLY
I
CB; ~
-2V
POWER
LINEAR
~
TEMSp!f:NuRE
SUPPLY
--.J
.-
OVER/UNDER
FAULT
VOLTAGE MONITOR
0?
t
V
R
+10V
VR'
REFERENCE
SUPPLY V
R2
I
START UP/SHUTDOWN
SEQUENCE CONTROL
1
FAN CONTROL
,
:
~
/
SUPERVISOR BOARD
+12VMM
+ 19VUNREG
-19VUNREG
+12V
+6V
+3V
-12V
-2V
NPV
PPON
NSYSPU
NPI
FANP
FANF
FANI
NFANHI
NPFW
-l
:::r
ro
0
""'I
'<:
0
--.
0
'0
ro
""'I
OJ
::t
0
::l
~
I
CJ1