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Removal and Replacement
WFM 90 and WFM 91 Service Manual
6–23
To replace the C-size alkaline batteries, perform the following procedure:
1. Press the batteries into place according to the polarity label on the bottom of
the battery compartment. See Figure 6–10.
NOTE. The polarity of the alkaline batteries must be correct for the instrument to
operate. Always replace all of the alkaline batteries at the same time when
replacing discharged batteries.
Figure 6–10: Installed polarity of alkaline batteries
2. Install the battery cover. Refer to Battery Cover on page 6–18.
The bottom cover assembly contains replaceable subparts. Procedures for
removing and installing the subparts are included below.
Bottom Cover. To remove the bottom cover, perform the following procedure:
1. Remove any installed batteries. Refer to Batteries on page 6–21.
2. Remove the six Torx screws from the bottom cover.
3. Carefully remove the bottom cover and place it beside the top cover.
CAUTION. To prevent damage to the battery-power wires soldered to the bottom
cover, carefully remove the bottom cover
Bottom Cover Assembly