IBM System/36 Maintenance Information Manual page 16

Procedure 120
1. Display the Error History Table to see if a FRU is identified by any SRC'g that are shown ("360
Getting ERAP Reports" on page 3-24).
2. Power off the 5363.
3. Go to "305 Cover Removal" on page 3-2.
4. Ensure that the internal cables are in the correct position, and are kept away from external covers.
5. Reseat all cards and cables to give better contact points.
6. Power on the system.
7. Ensure that the sxstem frame is grounded to a service ground and that the AC input voltage is inside the
tolerance. (See the manual Setting up your Computer-5363, SA21-9926, for correct grounding and
voltage information.). Verify that the system's DC voltages are correct. See "435 DC Voltage
Distribution" on page 4-11.
8. Power off the 5363.
9. Reinstall the 5363 covers, go to "305 Cover Removal" on page 3-2.
10. Load the system from disk.
a. Select function 1 (IPL).
b. Enter 0000.
c. Press the Start Function key.
11. Run SYSTEST for 5 minutes, go to "328 Service Procedures under SSP" on page 3-10 .. Follow the
prompts to select the devices that you want to run during SYSTEST.
12. Analyze any errors that occur during SYSTEST. See "360 Getting ERAP Reports" on page 3-24.
If errors occur, use the SRC to isolate the problem.
If no errors occur, this procedure is complete.
Note: Intermittent power problems, which can be caused by excess ripple on the AC power line or by failures
of the base or feature power supplies, can cause the following system conditions:
• If the Security switch is in the Normal position, an IPL is performed and the IPL Sign On display
appears on the system console.
• If the Security switch is in the Locked position, the control panel has only the Power On and
Output Display lights on.
• If the Security switch is in the Service position, the control panel contains a 1 in the Function
display and 0000 in the 4-character display.
If these conditions have occurred and you have verified that the AC power is good, exchange the
following FRUs in the order shown:
• Feature power supply (if present)
• Base power supply
1-4
5363 Maintenance Information