REPLACING FUSE
The Model 3451 contains an internal 3/4 A, 2AG, slow-blow fuse
(PN 016233). If the gauge will not power up, this fuse may be
blown. To replace the fuse:
✓ Turn the gauge off.
✓ Using a 9/64-inch Allen wrench, remove the six screws that
hold the top shell to the gauge base.
✓ Clean the screws and set them aside.
✓ Carefully remove the gauge top shell and slide it up, out of the
way. To keep it out of the way, tie the top shell to the handle.
✓ Locate the fuse, which is located on the top circuit board (see
Figure C–10).
✓ Remove the old fuse, and replace it with a new one.
✓ Re-assemble the gauge top shell.
Appendix C–26
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