Models 840/Sb3 (Fc 9079) - Time Of Day (Tod) Battery - IBM iSeries 270 Service Manual

CAUTION:
The weight of this part or unit is between 18 and 32 kilograms (39.7 and 70.5 pounds). It
takes two persons to safely lift this part or unit. (RSFTC204)
k. Unplug the cables attached to the lower left and right corners of the front cage/backplane
assembly.
7. Refer to "Final assembly, front - Models 840 and SB3 Processor Tower" on page 411 and perform the
following steps from the front of the system:
a. Remove the lower mounting screws from the front cage/backplane assembly.
Attention: The front cage/backplane assembly is heavier on the rear than it is on the front. The
front cage/backplane assembly may tip to the rear if it is not properly handled.
b. Use two people to remove front cage/backplane assembly from the front of the system.
CAUTION:
The weight of this part or unit is between 18 and 32 kilograms (39.7 and 70.5 pounds). It
takes two persons to safely lift this part or unit. (RSFTC204)
c. Place the front cage/backplane assembly on the floor in the upright position.
d. Disconnect the control panel cable from backplane.
e. There are hex head screws inside the front cage/backplane assembly that mount the backplane to
the cage. From inside the front cage, remove all but one of the hex head screws.
f. To prevent the backplane from falling, hold the backplane to the cage and then remove the last
screw.
g. Lay the front cage face down on the floor so the back plane is on top.
h. Remove the backplane from front cage.
i. Close all of the connector latches on the new Backplane. The latches need to be closed so they do
not interfere with the rear cage when it is installed.
8. To complete the replacement, reverse the previous steps beginning with step 7b (See page 91).
9. After exchanging an item, go to "Verify the repair" on page 558.
This ends the procedure.

Models 840/SB3 (FC 9079) - Time of day (TOD) battery

For use by authorized service providers.
Use this procedure to remove or replace the time of day (TOD) battery in the Models 840/SB3. The TOD
battery is located in the FC 9079 Base I/O Tower.
CAUTION:
This product contains a lithium battery. To avoid possible explosion, do no burn, exchange, or
charge the battery. Discard the battery as instructed by local regulations for lithium batteries.
(RSFTC232)
To remove or replace the time of day battery:
1. Power off the expansion tower. See Power on/off the system and logical partitions.
2. Remove the power cord from the base I/O tower.
3. Open the rear cover. See FC 5074, FC 5079, FC 5094, FC 5294, FC 9079, FC 9094 - Covers.
4. From the rear of the expansion tower perform the following:
a. Remove the EMC access plate that is located directly above the PCI card enclosure. Press the
surfaces of the two latching mechanisms together and tilt the top of the cover away from the frame
to remove it.
b. Disconnect the cables from the top of the PCI cards and note their locations.
Attention: All cards are sensitive to electrostatic discharge (see Work with electrostatic
discharge-sensitive parts).
Analyze hardware problems
91