Ericsson 344A3072P8, Maintenance Manual, Page: 16 / 26

This condition indicates that the battery is either
too hot (above 45
°
C) or too cold (below 0
°
C). If
the condition continues with battery at room
temperature, then check for continuity or shorts
between the charge control board output and the
sleeve contacts. If problem persists, replace the
charge control board.
FAULT CONDITION 3: CHARGE (red) LED flashes
slowly in standby (no battery
installed)
1. Verify charger control board output voltage at
CN102 pins 4 and 5 is approximately 5 volts.
If the voltage is zero volts, there is probably a
broken wiring pattern between R122 and D102
on the charger control board.
If the voltage is 12.6 volts, check IC103 pin 6.
If the voltage is correct (approximately 5 volts),
then the reset circuit is faulty.
Replace charger control board if found to be defec-
tive.
FAULT CONDITION 4: B o t h C H A R G E ( r e d ) a n d
READY (green) LEDs flash si-
multaneously.
1. The probable cause of this fault condition is shorted
components Q101 and D101, or defects in Q103 and
Q102.
This failure requires the replacing the charger
control board.
FAULT CONDITION 5: Irregular flashing of CHARGE
(red) LED after charge se-
quence has started.
1. This condition results when the voltage sense circuit
detects an excessively high battery voltage, normally
battery does not exceed 10.5 volts .
Replace battery with a known good battery. If
normal operation results, replace defective bat-
tery.
If the problem persists, replace the charge con-
trol board.
FAULT CONDITION 6: Battery overheats due to over
charging.
1. Verify voltage on charger control board IC103 pin 5.
Voltage should be 2.5 to 4.4 volts.
If voltage is out of range, replace charger control
board.
FAULT CONDITION 7: Charging stops before reaching
complete charge and READY
(green) LED flashes.
1. This condition results from attempting to charge a
battery with a limited capacity and is close to the end
of its life cycle.
Verify condition is not present when charging a
known good battery. Replace defective battery.
FAULT CONDITION 8: Extended charge time when
charging a "long battery", with-
out overheating.
1. When charging a long battery, the battery length
microswitch detects the battery length, switching the
charger to the correct rate of rapid charge (normal
charge current is 1.9 A
±
10%).
Check microswitch, replace if found defective.
Trace current paths back to power supply. Re-
place defective boards as required.
LBI-38708
16