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SYSTEM RACK
4-8
4.2.5 VOLTAGE ADJUSTMENTS
See Figure 4-10 for location of components and
Table 4-2 for wire connections.
1. Connect a voltmeter to U1, pin 76 on an RVM (DO
NOT use an extender card).
2. Adjust the +5V pot on the power supply for a
reading of 5.1V.
3. If +5.1V cannot be obtained, change R84 to a 5.6k
ohm 1/4W resistor.
4.2.6 REDUNDANT SUPPLY ADJUSTMENTS
See Figure 4-10 for location of components and
Table 4-2 for wire connections.
1. Remove the AC voltage to one of the supplies.
2. Connect a voltmeter to U1, pin 76 on an RVM (DO
NOT use an extender card).
3. Adjust the +5V pot for a reading of 5.1V. (If +5.1V
cannot be obtained, change R84 to a 5.1k ohm 1/4W
resistor.)
4. Connect a voltmeter to output of CR3 and verify that
the -5V line is -4.8V to -5.2V. (If not, make R68
lower to raise voltage.)
5. Remove the AC voltage to the adjusted supply and
connect AC voltage to the other power supply.
6. Connect a voltmeter to U1, pin 76 on an RVM (DO
NOT use an extender card).
7. Adjust the +5V pot for a reading of 5.1V. (If +5.1V
cannot be obtained, change R84 to a 5.1k ohm 1/4W
resistor.)
8. Connect a voltmeter to output of CR3 and verify that
the -5V line is -4.8V to -5.2V. (If not, make R68
lower to raise voltage.)
4.2.7 VERIFY FAN AIR FLOW DIRECTION
1. Connect the power cables to a 110V AC source.
2. Connect the Plus lead of the Fan Cable to Bus Bar
D1-16.
3. Verify both power supplies are turned OFF.
(Power Supply "A", is located on the left side at the
bottom of the rack. Power Supply "B" is located on
the right side at the bottom of the rack.)
4. Install both power supplies.
5. Turn Power Supply "A" on.
6. Verify that the Power On indicator is "ON" for
Power Supply "A".
7. Verify that the air flow from the fan is to the outside.
4.2.8 VERIFY VOLTAGES ON POWER DISTRI-
BUTION CABLE
1. Verify voltages in Table 4-13 for the Power Termi-
nation Cables for Shelves 1-6.
2. Turn Power Supply “A” OFF
.
Table 4-7 POWER SUPPLY CONNECTIONS
TB1 Wire
No.
Color From
Term 1
Term 2
Term 3
W1
W1
W1
Blk
Wht
Grn
AC (Hot)
AC (Ntrl)
AC (Gnd)
Line
Line
Line
TB2
Term 1
Term 2
Term 3
Term 4
Term 5
Term 6
Term 7
Term 8
Term 9
W1
W2
W6
NC
W7
W4
W5
W3
W8
Red
Red
Blu
Blu
Blu
Wht
Grn
Blu
+5V
+5V
Gnd
Gnd
+12V
-12V
-5V
Gnd
F1
F1
Gnd
Gnd
F3
F4
F2
Gnd