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Expansion units are included in the tables below.

1. Is the SRC 1xxx-15xx?

v No: Continue with the next step.

v Yes: Perform the following:

a. If you are working on a Model 825 that is powered off, the 1510 and 1520 reference codes can

be caused by the cover on the processor enclosure not being installed (see Locations - Model

825 ), or a faulty interlock switch assembly (see the Model 825 - Interlock switch remove and

replace procedure, and the Type, model, and part number list for the part number).

b. Find the unit reference code in the following tables to determine the failing power supply.

c. If the SRC is 1xxx-1500, 1510, 1520, or 1530 and the failing unit has the dual line cord

feature, perform “Power PIP11” on page 175 before replacing parts.

d. Refer to Locations and addresses to determine the location and part number of the failing item.

e. Replace the failing power supply.

f. Perform the following if the new power supply does not fix the problem:

1) Reinstall the original power supply.

2) Try the new power supply in each of the other positions listed in the table.

3) If the problem still is not fixed, reinstall the original power supply and go to the next FRU in

the list.

4) For SRCs 1xxx-1500, 1510, 1520, or 1530, exchange the power distribution backplane if a

problem prevails after replacing the power supply.

Table 12. Models 800 and 810