Figure 19: Input Connectors And Fuses - Tektronix ADA400A Instruction Manual

Maintenance
Replacing the Input Fuses
Accessing Internal
Components
Replacing the
Potentiometers
54
To remove and replace an input fuse, insert a flat-blade screwdriver into the slot
on the fuse cap, press in and turn counter clockwise to remove the fuse.
CAUTION. To properly protect the inputs of the ADA400A Differential Preamplifi-
er, replace fuses with the type specified in the Replaceable Parts section.
Insert the replacement fuse into the cap on the fuse holder, insert, and use the
flat-blade screwdriver to press in and lock the fuse cap counterclockwise.
+ Input Fuse

Figure 19: Input Connectors and Fuses

To access internal components of the ADA400A Differential Preamplifier, refer
to the exploded view, Figure 22, on page 63 and perform the following proce-
dure:
1. Using a 1/16-inch Allen wrench, loosen the set screws on the COARSE and
FINE controls and remove the knobs.
2. Remove the four screws that hold the top housing, separate the top housing
from the bottom housing and set the top housing to one side.
NOTE. If you intend to electrically adjust the ADA400A or move a jumper, do not
proceed further. The adjustments and jumpers are accessible through holes in the
circuit board shield. Proceed further only if you intend to replace parts under the
shield.
3. Following the static precautions presented at the beginning of this section,
remove the screws on the top of the shield and carefully lay the shield over
to the side without straining the wires of the potentiometers.
After performing the procedure to access the internal components of the
ADA400A Differential Preamplifier, replace one of the potentiometers as
follows:
1. Unsolder the wires from the potentiometer.
- - Input Fuse
ADA400A Differential Preamplifier