Ericsson 344A3072P8, Maintenance Manual, Page: 14 / 26

Fuse replacement
To replace the power supply fuse, F1, perform the follow-
ing steps:
1. Disassemble the charger (see Case disassembly
procedure).
2. Remove the Power Supply (see Power Supply
removal procedure).
3. Replace F1 with a 5A 250V UL/CSA fuse.
4. Reassemble charger.
TROUBLESHOOTING
PROCEDURES
STANDARD MULTI-UNIT CHARGER
The first step in troubleshooting the Standard Multi-unit
Charger is to make a careful visual inspection of the unit for
obvious signs of overheating components. Also check for
loose connections and cracked components. If there is no
evidence indicating the location of the failure, continue trou-
bleshooting by making voltage measurements or signal trac-
ing. Functional diagrams are provided to assist in
troubleshooting the units.
Quick Checks:
•
Check input power and AC plug
•
Ensure voltage selector switch is in the correct position
•
Ensure power switch is in the ON position
•
Check operation using a known good battery pack
•
Check battery sleeve charging contacts
•
Check inside connections between printed circuit boards
•
Check fuses on power supply assembly
•
Inspect for cold solder joints, solder bridges, or pattern
cuts.
CHECKING PROCEDURES
The following procedures will aid in isolating failures
to a field/shop replacable assembly. These procedures do not
attempt to isolate failures to the component level.
FAULT CONDITION 1: C h a rg e r d o e s n o t c h a rg e .
(CHARGE (red) indicator stays
off).
1. All six (6) slots are not charging;
Check power supply output voltage.
Measure voltage at CN3 between pins 1 and 2.
Voltage should be 15 Vdc
±
.2 volts. If voltage is
incorrect, check fuses F1 and F2 on power sup-
ply board. Replace fuses if bad, otherwise, re-
place power supply.
2. Only one slot is not charging;
Check charge control board output voltage.
Measure voltage at CN102 between pins 3 and
5. Voltage should be 15 Vdc
±
0.2 volts. If volt-
age is not present, verify input voltage at CN101
between pins 1 and 2. If no input voltage is
present replace the cable between power supply
and charge control board, if voltage is present
then the charger control board is defective.
FAULT CONDITION 2: Batteries do not charge to full
capacity.
1. Long batteries fail to charge to full capacity.
Check long battery microswitch for proper opera-
tion. Replace defective sleeve if necessary.
2. Clean sleeve battery terminals. Replace sleeve if de-
fective.
3. Battery has exceeded it’s useful life, replace battery.
LBI-38708
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