Specifications

Troubleshooting & Maintenance
151018 7-7
7.2.2 Replacing the Mother Board/Power Supply
Assembly
1. Remove the front plate by unscrewing the front plate retaining screws. (See Figure 3-1 for
locations of front plate retaining screws.)
2. From the front side of the receiver slide the replacement mother board/power supply
assembly back into the receiver chassis.
3. On the back of the receiver replace the four screws that hold the mother board/power sup-
ply assembly in place. (See Figure 7-1.)
4. Remove power by disconnecting the AC power cable (see Section 3.9 and 3.10) and
backup battery (if used).
5. Reconnect the AC power cable.
Note: Make sure to plug the AC power cable into a grounded outlet. (See Section 3.9.2 for procedure on how to
verify earth ground.)
6. Reconnect the back-up battery. (See Figure 3-13.)
7. Replace the front plate by screwing in the front plate retaining screws. (See Figure 3-1.)
7.3 Replacing the 9800 Fuse
If the AC Power light is off or flashing and the 9800 has 120 VAC of power, check the 9800
fuse. If the fuse needs to be replaced, follow the steps below.
1. Remove power from the 9800.
2. Locate the fuse cap on the back of the 9800 as shown in Figure 7-2.
Figure 7-2 Replacing the Power Supply Fuse
3. Using a flathead screw driver, gently turn the fuse holder counterclockwise to remove.
4. Remove the existing fuse from the fuse cap and replace with a 2.5A slow blow fuse.
5. Reinsert the fuse cap in the 9800 and gently turn clockwise until it is seated.