Tektronix ADA400A Instruction Manual page 61

Maintenance
2. Remove the nut on the shatt of the potentiometer and replace the potentiom-
eter with the new part. Replace and tighten the nut and washer on the shaft.
3. Resolder the wires as Figure 20 illustrates.
(Coarse)
311~2533-00 aa
—,
"a
Brown
Red
Figure 20: Potentiometer Connections
Replacing the Cable — After performing the procedure to access the internal components of the
Assembly = ADA400A Differential Preamplifier, replace the cable assembly as follows:
1. Remove the remaining two screws that hold the circuit board to the bottom
housing.
NOTE. To prevent contaminating sensitive areas of the circuit board, handle the
circuit board by the edges only.
2. Unsolder the four colored wires from the top of the circuit board and the
three ground prongs from the bottom of the circuit board.
3. Note the color-code information on the circuit board. Replace the cable
assembly and solder the new wires.
4. Place the circuit board and cable strain relief in the bottom housing and
reinstall hardware.
ADA4OOA Instruction Manual 49