Step 15; Step 16 - IBM 7212 102 Service Manual

Step 6
This step checks the power supply voltage levels as the possible source of the
problem.
1. Press the power switch to turn off the power to the 7212 Storage Enclosure.
2. Unplug the 7212 Storage Enclosure from the electrical outlet.
3. Disconnect the power supply connector (J1) from the internal power
4. Connect the power cable to both the 7212 Storage Enclosure and to the
5. Press the power switch to turn on the power.
6. Ensure the fan is operating on the power supply.
7. On the power supply connector J1 (see Figure 5), check the following:
Figure 5. Power Supply Connector J1
Are the voltages good, and is the power supply fan operating?
NO
YES
Step 7
This step checks the LED cable as the possible source of the problem.
1. Press the power switch to turn off the power to the 7212 Storage Enclosure.
2. Unplug the 7212 Storage Enclosure from the electrical outlet.
3. Disconnect the LED cable from the status interface card.
4. Connect the power cable to both the 7212 Storage Enclosure and to the
5. Press the power switch to turn on the power to the enclosure.
6. Check the voltage on the status interface card J1 connector pins with the 7212
Note: The fans can be turned to an OFF state by disconnecting the fan cable from
16
7212 Storage Device Enclosure Service Guide
distribution cable.
electrical outlet.
v The +12V signal falls between a minimum of +11.5 volts and a maximum of
+12.6 volts
v The +5V signal falls between a minimum of +4.8 volts and a maximum of
+5.25 volts
Replace the power supply (see "Removing and Replacing the
Power Supply" on page 33), reassemble the enclosure, and then
return to Step 1.
Reconnect the power supply to the internal power distribution
cable and then go to Step 7.
electrical outlet.
cooling fans set to the states listed in Table 8 on page 17. This table lists the
front panel status light states that would occur if the LED cable is plugged into
the J1 connector.
the status interface board.