Maintenance
Access Procedures
5
5-11
Warning
Wear eye protection. Use extreme care not to short the battery
terminals. The battery may explode if shorted.
1. Leave the ac power on to maintain calibration. Remove any cables connected to the
MONITOR/EXT BAT IN connector.
2. Set the rear panel BAT switch to .
3. Remove the six screws that fasten the top cover and remove the cover.
4. Disconnect the 4-pin, 2-wire connector from the battery where it connects to the A5
assembly.
5. Free the ribbon cable that comes from the front panel from its hold-down guides,
leaving it connected to the A5 assembly.
The “IN CAL” indicator on the front panel will no longer be illuminated. This does not
effect the reference if you do not remove the Mains Power from the instrument.
6. Pull off the red battery terminal lead.
7. Remove the four screws that fasten the battery hold-down bracket (which supports
the A5) to the chassis.
8. Wiggle the battery hold-down bracket until it breaks loose from the foam backing.
9. Lift the front edge of the battery hold-down bracket as shown in view A of Figure 5-
4.
10. Pull the battery hold-down bracket forward until it clears the rear bezel, then rotate it
90° and position it in the keyholes as shown in view B of Figure 5-4.
11. Disconnect the black battery terminal lead and lift out the battery.
12. Put a new battery in place.
13. Connect the black battery terminal lead only.
14. Slide the battery hold-down bracket in at the rear first as it came out, drop it into
place, and check for pinched wires.
15. Install the four battery hold-down bracket screws loosely first, then tighten them.
16. Reconnect the red battery terminal lead.
17. Reconnect the 4-pin connector from the battery to the A5 assembly. (Verify correct
polarity.)
18. Hook the ribbon cable that comes from the front panel under its two guides.
19. Check all connections for tightness.
20. Reinstall the top cover.
21. Set the BAT switch to the l position.
22. Reset the CAL swithc by pressing the button accessible through the rear panel CAL
RESET hole with an insulated probe.
23. Verify that the IN CAL indicator remains lit.
24. Reconnect ac line power for normal operation.
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