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Troubleshooting Procedures
6-40
WFM90D and WFM91D Service Manual
Battery-Fault Analysis
NOTE. If the instrument functions properly when powered by the AC adapter, but
there are battery or battery charging problems, use the following procedure. If
there are no battery problems or if the instrument does not function properly
with the AC adapter, proceed to Low-Voltage Power Supply on page 6--42.
Use the following procedure to determine if the battery charger circuit is
operating properly:
1. Remove the AC adapter from the WFM90D or WFM91D.
2. Remove the battery cover and any installed batteries from the instrument.
See Batteries on page 6--28.
3. Use three jumper wires to connect a 30 Ω, 3 W resistor to the battery
connector pins, as shown in Figure 6--19.
Jumper wires (3)
Battery connector
+
--
Test resistor
Figure 6- 19: Testing the battery charging circuit
NOTE. If the jumper w ires will not stay securely attached to the battery connector
pins, remove the instrument bottom case to obtain access to the battery
connector pins on the Bottom board. Refer to Bottom Cover on page 6--31.
4. Attach the voltmeter across the test resistor shown in Figure 6--19.
5. Connect the AC adapter to the WFM90D or WFM91D.