Power Supply Block Diagram - Agilent Technologies 8719ET Service Manual

POWER SUPPLY BLOCK DIAGRAM

8719/20/22ET/ES
A15 PREREGULATOR BLOCK DIAGRAM
LINE POWER
SWITCH
RECTIFIER
LINE
NEUTRAL
120V
GROUND
120V 120V
220V
220V 220V
+10V BIAS SHUTDOWN
+10V BIAS SUPPLY
CIRCUITRY
TEMPERATURE SENSE
GREEN LED
(NORMALLY ON)
SHUTDOWN SIGNALS:
l EXCESSIVE CURRENT
l OVER VOLTAGE (LINE)
l UNDER VOLTAGE (LINE)
l AMBIENT TEMPERATURE INSIDE
°
PREREGULATOR CASTING > 85 C
sb530e
GNDSENSE
+5VDSENSE
A15W1P2
RECTIFIER
90
93
3
3
0
+10V BIAS
0
CONTROL
1
CIRCUIT
1
0
0
RECTIFIER
RECTIFIER
OVER
CURRENT
SENSE
-
+
LSHDN
RECTIFIER
-
+
RECTIFIER
+5V
SHUTDOWN
RED LED
A15W1P2
(NORMALLY OFF)
LSHDN
6
A8 POST A15 PRE
A17 MOTHERBOARD
REGULATOR REGULATOR
A17J3
GNDDSENSE
2
A8P1
A17XA8J
5 +5VDSENSE
4 +5VD
+5VCPU
+5VCPU 18,19
6
48,49
GNDA
10
GNDA
9
RET CPU
1
RET CPU
22,23
GNDD
3
52,53
A8J2
A15W1P1
+25V
94 11
NC 12
+18V
92 3
92 4
-18V
5
97
6
97
NC
7
+8V
96 8
-8V
10
95
95 9
3 or 2 2
NC 1
A17
MOTHERBOARD
A8P1
A17J3
A17XA8J1
LSSHDN
3
A8 POST-REGULATOR BLOCK DIAGRAM
A8J2
P/O
11,12 FILTER
A15W1
+25V
+18V 3,4 FILTER
TO
FAN
DRIVE
+8V 7,8
FILTER
-8V
9,10
FILTER
-18V 5,6 FILTER
A17
TO
FAN
MOTHER-
DRIVE
BOARD
A8P1
A17J2
18,19
+5VD 3
48,49
1
22,23 FILTER
2
52,53
5
6
W37
SHUTDOWN CAUSES:
l EXCESSIVE CURRENT
l OVER VOLTAGE
A22
l UNDER VOLTAGE
DISPLAY
l OVER TEMP
INTERFACE
SHUTDOWN DISABLE: SDIS-AGND
POWER SUPPLY BLOCK DIAGRAM
8719/20/22ET/ES
TP10
+22V
REG
TP7
REG +15V
+15V p-p
+
+15VSRC
TP11
+6V
REG
+7.5V
TP8
+5VU
REG
+5VA
TP2
AGND
TP9
-5.2V
REG
TP5
-15V
REG
TP6
REG -12.6V p-p
TO STATUS
+5VDSP
TP3
+5VD
TP4
SDIS
SHUTDOWN
12.5V p-p
STATUS
TO A9
CPU
OVER TEMP
AIRFLOW
TEMP
+18V
TO
FAN
DRIVE FAN
-18V