Product Manual
2120
Output Fuse Replacement
This unit features output reverse polarity connection protection. If a load or battery is
connected to the output in reverse polarity, the output fuses will blow to protect the power
supply or battery charger.
The unit is inoperable until the fuses are replaced. See the specications section for rating
and make fuses. When replacing the fuses, ALL the fuses must be replaced as they operate in
parallel.
CAUTION: BEFORE REPLACING THE FUSES, DISCONNECT THE UNIT FROM THE
POWER SOURCE AND MAKE SURE THE POWER SWITCH IS OFF.
To prevent risk of high voltage electric shock, the unit must be fully disconnected from power
before attempting to replace the output fuses.
TO REPLACE THE FUSES:
1. Loosen and remove the ten screws holding the front panel to the chassis.
2. Gently pull the front panel free from the main circuit board. The output fuses are mounted
in fuse holders on the front panel circuit board. Their location is indicated below.
3. Replace the old fuses with new fuses. The new fuses must be the same type and rating
as the old ones. See Specications for more information regarding output fuses.
4. The main circuit board connects to the front panel, via the black square shaped
connectors above the fuses. Gently push the two together to seat them.
5. Make sure that any O-ring seals and gaskets are properly seated. This is very important
for the W/Y models in order to maintain a water-tight seal!
6. Re-insert all the front panel screws loosely, making sure none are cross-threaded. Once all
screws are started, tighten them in sequence. The screws are made from corrosion resistant
stainless steel which is softer that regular steel, so take care to not over-tighten.
7. Reconnect the unit to power and check that it turns ON. Turn the unit OFF and then,
making certain that the polarity is correct, reconnect the load or battery to the output.
Turning the unit ON, normal operation should resume immediately.
Pictured: Front panel circuit board. Output fuse location indicated by red circle.