Tweco 3000 Merlin - Manual (Page 50)

SERVICE 5-6 Manual 0-2532
3. Remove the side panels from the Power Supply.
4. Reinstall the panels by reversing the above steps.
B. Fuse Replacement
There are three fuses located on the Power Supply as
follows:
• Two fuses are located in the torch leads connection
area under the hinged cover at the Front Panel.
These fuses are in a typical fuse holder that re-
quires removal of the fuse holder cap to replace
the fuse.
• One fuse is located inside the Power Supply be-
hind the Right Side Panel. The fuse is located
above the Bias PC Board and to the right of the line
filter.
Replace the fuse inside the Power Supply as follows:
1. Remove the Right Side Panel as described in
paragraph “A” above.
2 Locate the internal fuse mounted above the Bias
PC Board and to the right of the line filter near
the center edge of the unit.
3. Remove the damaged Fuse for the snap type fuse
holder.
4. Reinstall the replacement Fuse by reversing the
above steps.
B. Coolant Filter Assembly Replacement
The Coolant Filter Assembly is located on a bracket on
the Rear Panel Assembly of the unit.
1. Remove the two Coolant Hose connections to the
Coolant Filter Assembly.
2. Remove the two elbow fitting on each side of the
Coolant Filter Assembly and remove the dam-
aged assembly from the bracket.
3. Clean the old thread sealer from the threads of
the elbow fittings.
4. Apply a thin coating of liquid teflon thread sealer
to the threads of the elbow fittings.
5. Place the replacement Coolant Filter Assembly
in the bracket with the arrow pointing to the left
and reinstall the two elbow fittings.
6. Reconnect the two Coolant Hoses to the Coolant
Filter Assembly making sure that the hose to the
Pump Assembly is on the output of the Coolant
Filter Assembly (left side as viewed from the
back).
C. In-Line Filter Assembly Replacement
The In-Line Filter Assembly is located inside behind the
Left Side Panel (viewed from the front of the unit). The
filter is attached to the radiator inside of the Lower Front
Panel.
1. Remove the Left Side Panel from the Power Sup-
ply per paragraph 'A' above.
2. Locate the In-Line Coolant Filter near the front of
the unit.
3. Remove the two Coolant Hose connections to the
In-Line Filter Assembly.
4. Clean the old thread sealer from the threads of
the hoses and the fittings.
5. Apply a thin coating of liquid teflon thread sealer
to the threads of the fittings.
6. Reconnect the two Coolant Hoses to the In-Line
Filter Assembly making sure that the top hose
goes to the Flow Switch Assembly. The bottom
hose comes from the Radiator Assembly.