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5 Maintenance
5.3
Fuse Replacement
The 2020 requires two 5 x 20 mm, 4 A, T type (Slow Blow) fuses.
The fuses are located inside the explosion proof housing on the Electrical
Connector Panel, as shown in Figure 5-1. To replace a fuse:
1. Disconnect the Unit from its power source.
2. Place a small screwdriver in the notch in the fuse holder cap,
push in, and rotate 1/4 turn. The cap will pop out a few
millimeters. Pull out the fuse holder cap and fuse, as shown in
Figure 5-1.
Figure 5-1: Removing Fuse Cap and Fuse from Holder
3. Replace fuse by reversing process in step 1.
Remove Power to the instrument before changing fuses.
5-2
2
Amplifier output doesn't match test input
3
Both Failed
>3
Open gain resistor
Cell
0
OK
1
Failed (open filament, short to ground, no
power.)
2
Unbalance (deterioration of filaments,
blocked tube)
Teledyne Analytical Instruments
Model 2020
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