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Maintenance
THS710A, THS720A, THS730A & THS720P Service Manual
6–11
You will need a torque-limiting Torx T-15 screwdriver, needle-nose pliers, and
sharp knife to remove the front cover and other immediately accessible modules.
CAUTION. Attempting to remove the display shield from the front cover will likely
destroy both pieces. If one or the other are defective, both must be replaced.
Removal. Use this procedure to remove the front cover and access the handle,
switch mat, battery door, and gasket.
1. Disconnect all probes, cables, or meter leads from the instrument.
2. Disconnect the AC adapter, open the battery door, and remove the battery.
3. Place the TekScope instrument face down on a soft surface (such as an
anti-static mat).
4. Use the Torx T-15 screwdriver to remove the four screws that hold the case
together.
5. Holding the case together, pick it up and place it back side down on a soft
surface.
6. As you lift the front cover off the instrument, press the buttons as necessary
to prevent the switch mat from coming off with the front cover.
7. To remove the handle, slip it off its guides.
8. To remove the switch mat, lift it off the switch flex-circuit assembly. Place it
button-side down on a clean surface.
CAUTION. To avoid contamination of switch contacts, do not touch the carbon
contacts on the switch flex-circuit assembly or on the back side of the switch
mat.
9. To remove the battery door, use the needle-nose pliers to slip the retaining
tether off of the post inside the instrument case as shown in Figure 6–4.
Front Cover