Manual 0-2569 45 REPLACEMENT PROCEDURES
4. Place the replacement Current Knob on to the po-
tentiometer shaft with the location of the pointer
the same as noted in step 1.
5. Tighten the screw to secure the knob to the poten-
tiometer shaft.
B. ON/OFF Switch Replacement
1. Unlatch the Access Panel to gain access to the rear
of the ON/OFF Switch.
2. Disconnect all the wiring to the ON/OFF Switch.
3. Squeeze the top and bottom of the switch while
pulling it out of the Access Panel
4. Install the replacement ON/OFF Switch by revers-
ing the above procedure.
C. RUN/SET/PURGE Switch Replacement
1. Open the Access Panel to gain access to the rear of
the RUN/SET/PURGE Switch.
2. Disconnect all the wiring to the RUN/SET/PURGE
Switch.
3. Squeeze the top and bottom of the switch while
pulling it out of the Access Panel
4. Install the replacement RUN/SET/PURGE Switch
by reversing the above procedure.
D. LED/Current Control PC Board Assembly
Replacement
1. Remove the Current Knob per paragraph 'A' above.
2. Unlatch the Access Panel to gain access to the LED/
Current Control PC Board.
3. Remove the four screws and washers securing the
LED/Current Control PC Board to the Access
Panel.
4. Disconnect the connector at J5 of the LED/Current
Control PC Board.
5. Install the replacement LED/Current Control PC
Board by reversing the above procedure.
E. Access Panel Replacement
1. Remove the Right Side Panel per Section 5.04-A.
2. Remove the following components from the Ac-
cess Panel:
• Current Knob per paragraph 'A' above.
• ON/OFF Switch per paragraph 'B' above.
• RUN/SET/PURGE Switch per paragraph 'C'
above.
• LED/Current Control PC Board per paragraph
'D' above.
3. Remove the four screws securing the Access Panel
to the LED/Current Control PC Board standoffs.
4. Install the replacement Access Panel by reversing
the above procedure.
5.06 Front Panel/Chassis Parts
Replacement
NOTE
Refer to Section 6.05, Front Panel/Chassis Replace-
ment Parts, for parts list and overall detail draw-
ing.
A. Internal Coolant Filter Replacement
The Internal Coolant 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 Section 5.04-A.
2. Locate the Internal Coolant Filter near the front of
the unit.
3. Remove the Coolant Hose from the Internal Cool-
ant Filter Assembly.
4. Remove the Internal Coolant Filter from the fitting
on the Radiator.
5. Install the replacement Internal Coolant Filter As-
sembly by reversing the above procedure and not-
ing the following:
• Clean the old thread sealer from the threads of
the hose and the fitting.
• Apply a thin coating of liquid teflon thread
sealer to the threads of the fitting.
B. Radiator Replacement
1. Remove the Left and Right Side Panels per Section
5.04-A.
2. On the right side of the radiator locate the Hose
Assembly connected to the input of the Radiator
at the top.
3. Remove the Hose Assembly from the Radiator in-
put connection.
4. Remove the Internal Coolant Filter per paragraph
'A' above.
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