Internal Fuse Replacement - Microwave Data Systems MDS TransNET 900 Installation & Operation Manual

7.5 Internal Fuse Replacement

The radio is protected by an internal fuse. Most likely the fuse will be blown
by an over-voltage transient or an internal failure. Follow the procedure
below to remove and replace the fuse:
1. Disconnect the primary power cable and all other connections to the unit.
2. Place the radio on its back and remove the four Phillips screws at the
corners of the bottom cover.
3. Carefully separate the top and bottom covers. There is a flat ribbon cable
between the top cover's LED panel and the motherboard. You do not need
to disconnect the ribbon cable.
4. Locate the fuse holder assembly behind the power connector.
(See Figure 17).
5. Loosen the fuse from the holder using a very small screwdriver, then use
a small pair of needle-nose pliers to pull the fuse straight up and out of
the holder.
6. Use an ohmmeter or other continuity tester to verify that the fuse is
blown.
7. Install a new fuse by reversing the process. Replacement fuse
information: Littelfuse #0454002; 452 Series, 2 Amp SMF Slo-Blo fuse
(MDS Part No. 29-1784A03).
8. Re-install the covers, interface cables and check the radio for proper
operation.
44 MDS TransNET 900 I&O Guide
Invisible place holder
Figure 17.
Internal Fuse and Holder
Assembly Location
MDS 05-2708A01, Rev. B