Regulator Problem Isolation
Note: Read the Danger and Caution notices under “Safety Notices” on page xiii before
continuing with this procedure.
Attention: The ac power cable must be disconnected from the system rack before
removing or installing regulators R04, R05, and R06.
1. Power off the system.
2. Disconnect all cards in the system rack except the SPCN card, regulator
assemblies, and the clock card.
Attention: To prevent overheating problems, do not remove any card completely
from the card enclosure unless you install an airflow card in its place.
Note: Disconnect the cards by pulling them out about one inch.
3. Power on the system.
Does a regulator SRC occur?
No Go to step 8 on page 111.
Yes Go to step 4.
4. Perform the following:
a. Power off the system.
b. If the SRC identifies the failing regulator, start with that regulator.
c. Remove one of the regulators and install a new regulator.
d. Power on the system.
Does a regulator SRC occur?
No The regulator assembly that was removed in this step is failing, replace
the regulator assembly.
This ends the procedure. Go to ″Map 0410: Repair Checkout″ in the
Diagnostic Information for Multiple Bus Systems.
Yes Go to step 5.
5. Perform the following:
a. Power off the system.
b. Remove the new regulator assembly that you just installed and install the
original regulator assembly.
c. Remove a different regulator (not previously removed) and install a new
regulator.
d. Power on the system.
Does a regulator SRC occur?
No The regulator assembly that was removed in this step is failing, replace
the regulator assembly.
This ends the procedure. Go to ″Map 0410: Repair Checkout″ in the
Diagnostic Information for Multiple Bus Systems.
110 Service Guide
To Next Page
Loading...
Need help?
General