Thermal Dynamics PakMaster 50 XL Plus, Service Manual

Page: 37 / 74

Manual 0-2745 31 SECTION 5: REPLACEMENT PROCEDURES
5.05 Access Panel Parts
Replacement
NOTE
Refer to Section 6.04 for parts list and overall detail draw-
ing.
A. CURRENT Knob Replacement
1. Turn the CURRENT adjustment fully counter clock-
wise and note the location of the pointer on the
knob.
2. Loosen the screw securing the Current Knob to the
potentiometer shaft.
3. Remove the old knob.
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/LATCH Switch Replacement
1. Unlatch the Access Panel to gain access to the rear
of the RUN/SET/LATCH Switch.
2. Disconnect all the wiring to the RUN/SET /LATCH
Switch.
3. Squeeze the top and bottom of the switch while
pulling it out of the Access Panel
4. Install the replacement RUN/SET/LATCH Switch
by reversing the above procedure.
D. Pot/LED PC Board Assembly Replacement
1. Turn the CURRENT adjustment fully counter clock-
wise and note the location of the pointer on the
knob.
2. Loosen the screw securing the Current Knob to the
potentiometer shaft.
3. Remove the Current Knob.
4. Unlatch the Access Panel to gain access to the Pot/
LED PC Board.
5. Remove the Pot/LED PC Board from the four stand-
offs.
6. Disconnect the connector at J14 of the Pot/LED PC
Board.
7. Install the replacement Pot/LED PC Board by re-
versing the above procedure.
E. Access Panel Replacement
1. Remove the Right Side Panel per Section 5.04-C.
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 Switch per paragraph 'C' above.
• Pot/LED PC Board per paragraph 'D' above.
• Ground Wire
3. Remove the two nuts and washers securing the
Access Panel to the Right Side Panel.
4. Install the replacement Access Panel by reversing
the above procedure.
5.06 Front Panel Parts Replacement
NOTE
Refer to Section 6.05 for parts list and overall de-
tail drawing.
A. Work Cable Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Remove the Right Side Panel per Section 5.04-C.
3. Loosen the Work Cable end at the terminal on the
Output PC Board.
4. Remove the Work Cable end from the Output PC
Board terminal.
5. Remove the tie-wrap holding the Work Cable to
the CD Coil Lead.
6. Carefully pull the Work Cable out through the Bush-
ing in the Center Chassis.
7. Continue pulling the Work Cable down through
the current sensor mounted on the Logic/Gate PC
Board.
8. Remove the Work Cable strain relief from the Front
Panel.