Power Supply Removal And Replacement; Power Supply Removal - Toshiba Strata DK24 Installation And Maintenance Manual

4) Using a multimeter (set to the appropriate range),
measure the voltages at the pins of the DC OUT
connector for DK56/DK96 or the P1 backplane
connector for DK24 as shown in Figures 5-3, 5-
4, or 5-5. Ensure that the voltages fall within the
ranges specified. If a measured voltage falls
outside of the acceptable range, remove the
DC power plug from the power supply DC OUT
connector (DK56/96) or P1 backplane connec-
tor (DK24) and measure again. If a measured
voltage is still unacceptable, replace the power
supply. (Refer to Paragraph 4.)
DC Voltage Range Specifications
-24V:
-5V:
+5V:
3.01 To test the power supply voltages with all
circuit boards installed, install the circuit boards
and use the procedure in Paragraph 3.00 for the
PPSU56/96. Use the following procedure to test
the PPSU24.
CABLE FROM REAR
OF POWER SUPPLY
FG -24V -5V
2
-24V +5V
1
CONNECTOR
P1
BACKPLANE
KSU (FRONT VIEW)
FIGURE 5-3
PPSU24 FRONT PANEL AND DC OUT TEST POINTS
-26.3 ~ -27.8
-4.5 ~ -5.5
+4.5 ~ +5.5
BATTERY
CONNECTOR
DG
VOLTAGE
LED's
TEST POINTS
1) Loosen the four screws holding the panel on
the back of the KSU.
2) Lift the panel up and pull it off of the KSU.
3) On the lower left side of the backplane PCB
(PMB-824), the test points for the various volt-
ages are marked. Refer to Figure 5-6.
4) Using the multimeter (set to the appropriate
range), measure the voltages at the desig-
nated test points.
NOTE:
The multimeter test probes must have sharp
tips to penetrate solder mask on backplane
PCB.
4 POWER SUPPLY REMOVAL AND
REPLACEMENT
4.00 The following paragraphs provide procedures
necessary to remove and replace faulty power
supplies.
PPSU 24
-24V 1 -24V 2
FG
LG
CAUTION
FG
BEFORE CONNECTING THE AC PLUG
WITH PLUG SOCKET, BE SURE TO
FIT THE POWER UNIT TO THE
CABINET. IF AC PLUG IS INSERTED
LG TO THE PLUG SOCKET AT POWER
UNIT AND ANY INTERNAL PART
IS TOUCHED, AN ELECTRIC SHOCK
ACCIDENT MIGHT DEVELOP.
WHEN THE POWER SOURCE IS
DISCONNECTED WITH THE
CABINET FOR EXCHANGING OF
POWER UNITS, BE SURE TO
TURN OFF THE POWER SWITCH
AND PULL OUT THE AC PLUG
+
FROM THE PLUG SOCKET BEFORE
DOING SO.
BATT
_
POWER
-24V
AC LINE
OUT
+5V
-5V
5-3
INSTALLATION-KSU
SECTION 400-096-205
SEPTEMBER 1992
POWER
ON
SWITCH
OFF
CIRCUIT
BREAKER
MOUNTING
SCREWS ON
RIGHT SIDE
FG
AC POWER
CORD