Voltage Sensing Diagram - HP 9020 Service Manual

2-10
Theory of Operation
B
POWER SUPPLY
MODULE
ASSEMBLY
(")
(/)
(")
(")
I
(")
(")
(") (") (")
(")
(/)
(/) I\)
(") (")
' ! 1.
(/)
(/)
(/)
' ! 1.
I
J;)
(/) (/)
(/)
I -..j
(XI
w
w
U'1
OJ
I\) I\)
~
I\)
I
(j)
(j)
(j)
(j)
PROCESSOR
STACK
OPTIONAL
INPUT
DEVICE
+3
+5
+6
+12
-2
I\)
(j)
~
'~
V--
V
MOTHERBOARD
V
V
PRINTER
KEYBOARD
B
-12
MASS
STORAGE
#1
I/O
BACKPLANE
MASS
STORAGE
CONTROL
MASS
STORAGE
#2
NOTES
DISPLAY
CS5 + 5 VOLT CONTROL SENSE
CS-12G = - 12 VOLT GROUND CONTROL SENSE
~
=
CONNECTIONTOGROUNDPLANE
CS5
+ 5
=
CONNECTION OF + 5 VOLT CONTROL
SENSE OF + 5 POWER LINE.
Figure 2-5. Voltage Sensing Diagram