6
Maintenance and Troubleshooting
Battery Replacement
6-1
Section 6
Maintenance and Troubleshooting
6.1 Battery Replacement
When the internal battery no longer provides sufficient voltage for proper operation, a LOW BAT indicator
will appear in the upper left corner of the display. When this indication appears replace the battery as
follows:
1. Turn the power OFF.
2. Open the battery compartment on the rear panel.
3. Remove and disconnect the old battery.
4. Insert and connect a fresh 9 V NEDA type 1604 (or equivalent) battery.
5. Snap the battery compartment door closed.
6.2 Accessing the Circuit Boards
Use the following procedure to gain access to the circuit board components and test points:
NOTE
Refer to Figure 5-1 (see Section 5, Calibration and
Adjustments) for adjustment and test point
locations.
1. Remove the two screws from the case bottom.
2. Carefully lift the top cover to expose the circuit board.
3. If necessary, remove the four screws which attach the slide filter to the circuit board to gain access
to the circuitry below the slider.
3. If required, remove the circuit board by removing the 4 nuts which hold it in the lower case.
To reassemble the unit:
1. Position the circuit board so that the mounting holes align with the screws in the lower case.
2. Position the standoff on the diode lead shield and attach the slide filter plate.
3. Carefully fit the top and bottom covers together.
4. Replace the two cover screws