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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 6-17
6.9 TVS and Fuse (Nonmetallic Aircraft Only)
This section applies to IFR nonmetallic aircraft only. VFR nonmetallic aircraft do not require the use of
TVSs or fuses.
Certain nonmetallic aircraft will require TVSs at the main power input of the GTN. Refer to the
GTN 6XX/7XX AML STC Installation Manual for TVS component part numbers.
6.9.1 Fuse
Removal
1. Open the fuse holder and remove the fuse.
Reinstallation or Replacement
1. If the fuse continuity checks good, reinstall fuse and close the fuse holder. If the fuse is open,
replace the fuse and close the fuse holder.
6.9.2 TVS
TVS1 Removal
1. Remove the shield block grounding screw and remove the ring terminal from the backshell of the
connector as shown in Figure 6-9.
2. Open the fuse holder and remove the fuse.
3. Carefully remove heat shrink from the TVS ensuring not to cut the insulation on the wire under the
heat shrink.
4. On the fuse end of the TVS, use a soldering iron to heat the solder joint to remove the TVS.
TVS1 Replacement
CAUTION
Be aware of the orientation of the TVS during replacement. Refer to Figure 6-9 for proper
alignment of the TVS.
1. Solder new TVS onto the exposed wire from the fuse holder.
2. Solder a small piece of wire to the opposite end of the TVS. The total wire length to the
environmental splice is not to exceed 6".
3. Install heat shrink over the exposed TVS and solder joints.
4. Attach the ring terminal to the new lead as shown in Figure 6-9.
5. Place the fuse back into the fuse holder and close the holder.
6. Reattach the ring terminal to the backshell of the connector.