Step 6; Step 7; Step 14; Step 15 - IBM 7208 Model 345 Service Manual

7. On the power supply connector J2 (see Figure 10), check that the +12V signal
Figure 10. Power Supply Connector J2
Are the voltages good, and does the power-on light come on and stay on?
NO
YES

Step 6

This step examines the cooling fan as the possible source of the problem.
1. Press the power switch to turn off the power.
2. Reconnect the power supply connector (J2) to the cooling fan.
3. Press the power switch to turn on the power.
Does the power-on light come on and stay on, and is there airflow from the fan?
NO
YES

Step 7

This step examines the drive as the possible source of the problem.
1. Press the power switch to turn off the power.
2. Reconnect the power supply connector (J2) to the drive.
3. Press the power switch to turn on the power.
Does the power-on light come on and stay on, and is there airflow from the fan?
NO
YES
falls between a minimum of +11.5 volts and a maximum of +12.6 volts.
Replace the power supply, and then return to Step 4. Refer to "Removing
and Replacing the Power Supply" on page 28.
Go to Step 6.
Replace the cooling fan, then return to Step 6. Refer to "Removing and
Replacing the Cooling Fan" on page 30.
Go to Step 7.
Replace the drive, then return to Step 7. Refer to "Removing and Replacing
the Drive" on page 27.
Go to Step 8.
Chapter 3. Maintenance Analysis Procedures
21