Maintenance
Access Procedures
5
5-9
4. Reverse the HI and LO (positive and negative) leads on the UUT and certified 732B.
5. Average 8506A readings over a period of at least one minute.
6. Subtract the reading in step 5 from the reading in step 3 and divide this difference by
2.
7. To determine the 10V value of the 732B UUT, add the value in step 6 to the 10V
value of the reference.
8. If the IN CAL led is illuminated, proceed to step 9. If it is not, depress the switch
inside the RESET hole located on the rear panel.
9. Calibration of the 10V output is complete. Record all test results. Disconnect all test
equipment. Place the top cover on the UUT, securing it with the six screws. Cover
the RESET hole and one of the six screws with tamper-proof calibration seals.
Access Procedures 5-10.
Procedures to access the battery, the oven assembly, the A5 Battery Charger/Power
Supply, and the power transformer follow. No access procedure is provided for
components and assemblies inside the oven assembly. The oven assembly contains no
user-serviceable parts, and must be replaced as a unit in case of failure. This unit is the
small box inside the foam insulation, and it includes the attached flex circuit.
Initial Access Procedure 5-11.
Refer to Figure 5-3 and proceed as follows to remove the 732B cover and prepare to
access internal components:
Warning
To avoid explosion or fire, be careful not to short the battery
terminals.
1. Remove the ac line cord from the rear panel.
2. Remove the six screws that fasten the top cover to the chassis. Three screws are
located on each side of the instrument cover near the bottom.
3. Lift off the top cover.
Replacing the Battery 5-12.
For preventive maintenance, replace the battery every 18 to 24 months if the 72 hour
battery backup time is important. If the battery fails to switch from high-current charging
mode to trickle voltage mode, either the charger is defective or the battery needs
replacement. Troubleshooting procedures for the A5 Battery Charger are presented
further on in this section.
The correct battery is available from Fluke by ordering Fluke P/N 887042. Refer to
Figure 5-4 and proceed as follows to replace the battery:
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