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Maintenance
THS710A, THS720A, THS730A & THS720P Service Manual
6–39
Battery and External Power. Verify the battery and external power with the
following procedure:
NOTE. If the instrument runs normally under battery power but only for a short
time, the battery may have lost its capacity to hold a charge. You may be able to
recover some of its capacity by repeatedly charging and then completely
discharging the battery several times. If several charge/discharge cycles do not
improve the battery life, it should be replaced.
1. Install a fully charged battery and connect the AC adapter to the instrument.
2. Turn the instrument on.
3. Disconnect the AC adapter plug from the instrument. If the instrument turns
off, then battery power is not working. Go back to step 5 on page 6–29 to
troubleshoot the problem.
4. While the instrument is running, reconnect the AC adapter and then remove
the battery. If the instrument turns off then external power is not working.
Disconnect the AC power adapter from the instrument and use a DMM to
measure its DC output voltage. Follow the instructions in the table below.
AC Adapter Voltage Measurement Instructions
Less than 12 V
DC
The AC adapter is probably defective.
Replace it.
Greater than 12 V
DC
The main board is probably defective.
Replace it.