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Table 3-1. Power Supply Test Voltages
Test Conn.
Test Point
Nominal Voltage
Pin No.
1
+5
+5.1 V ±0.10 V
2
+12
+ 12.0 V + 0.72 V, -0.36 V
3
-12
-12.0 V ±0.72 V
4
+5M
+5.1 V ±2%
5
paN + (Power ON)
+3.7V ±1.3 V
6
PFW - (Power Fail Warning)
+3.7V ±1.3 V
7
MLT - (Memory Lost)
+3.7V ± 1.3 V if battery backup is installed
0.4 V ± 0.4 V if battery backup is not installed
8,9
<t>1, <t>2
19.5 Vrms + 1.95, -2.3 Vrms (at 0 to .02 Amps)
19.5 Vrms ± 1.6 Vrms (at .02 to 1.5 Amps)
12
Common
If
any of the voltages are out of tolerance, perform the following steps to identify the malfunction:
1.
Set the ac Power Switch (LINE switch) to OFF, the Battery Enable switch to DISABLE (if
battery backup is installed), and disconnect the ac power cord. Wait 90 seconds before
proceeding to the following steps.
2.
Remove the, front panel and fan panel to uncover the power supply. Refer to the removal
and replacement sections later in this chapter for instructions.
3.
Verify that the ac line configuration/fan power plug is plugged into the correct connector on
the power supply. Refer to Figure
2-2.
a.
For 115 Vac power sources, plug the configuration/fan power plug into connector P8.
b.
For 230 Vac power sources, plug the configuration/fan power plug into connector P7.
4.
Reconnect the ac power cord and set the LINE switch on the rear panel to ON. If battery
backup is installed, set the Battery switch on the power panel to ENABLE.
5.
Using a voltmeter, verify that the signal values at the rear panel test connector are the same
as those listed in Table 3-1.
a.
If a charged battery pack is installed and the MLOST- (memory lost) signal is not
within tolerance, turn the power supply OFF for 90 seconds, then ON again. If the fault
recurs, replace the power supply.
b.
If a charged battery pack will not sustain one memory array card for 60 minutes, or four
memory array cards for 15 minutes, replace the power supply. Note that the battery
pack must have been charged for 24 hours in order to sustain memory for the specified
amounts of time.
c.
If the
25
kHz sine wave
<t>
1 and
<t>2
signals are not within tolerance, turn the power OFF
for 90 seconds, then back ON. If the fault recurs, replace the power supply.
Service
3-3
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