Avtron Model T477W Bonding Meter
with B14703 Battery Pack Replacement Instructions
Part Number T477WC15292
Troubleshooting
Subject to the EAR, ECCN [9E610.a].
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5-1
5
TROUBLESHOOTING
5.1
Battery Problems
Problems with the battery pack are relatively easy to diagnose and correct.
Access to the T477W battery pack is achieved by removing two screws located on the back of the meter case and separating
the front panel from the case. The battery is the large blue/black panel labeled B14703, located in the middle of the bottom
circuit board. The battery connections are the four terminals labeled 1, 2, 3, and 4 on the sides of the pack.
Unless a battery is known to be bad, it is recommended that the battery be charge/discharge tested as described in the
Appendix, Section 7. This test requires time to perform, but it is the only good means of identifying battery condition. The
simple measurement of battery voltage is
not
an accurate indication of battery condition.
Following battery testing, a defective battery pack may be removed and replaced by following the B14703 battery pack
supplemental installation instructions at the end of this manual. If the replacement battery is not fully charged, it is
recommended that it be charged and re-tested per the Appendix battery testing procedures.
TROUBLESHOOTING WHEN BATTERY DOES NOT CHARGE
PROBABLE CAUSES
1.
Charger not plugged in
2.
Broken charger connection wire
3.
Defective charger
4.
Charger input voltage switch set to wrong position
5.
Open or shorted battery
