TM 9-4120-402-14
4-30. MODE SELECTOR ROTARY SWITCH (S1). - continued
a. Inspect.
(1) Remove four sets of screws (1), lock washers (2), and flat washers (3) securing control panel (4) to control
box (5).
(2) Carefully pull control panel (4) awa from control box (5) as far as harness will allow.
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(3) Check MODE selector rotary switch (6) for general condition and loose, broken, or missing terminals.
Replace MODE selector rotary switch if damaged.
b. Test.
(1) Using stator contact detail diagram, check continuity across MODE selector rotary switch (6) terminals.
(a) In OFF/RESET position continuity should be indicated between input terminal (m) and output terminal(b).
(b) In VENT position continuity should be indicated between inut terminal (m) and output terminal (c).
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(c) In COOL position continuity should be indicated between input terminal (m) and output terminal (d).
(d) In HEAT position continuity should be indicated between input terminal (m) and output terminal (a).
(2) Replace MODE selector rotary switch (6) if it tests defective.
c.
Replace.
(1) Loosen two setscrews holding knob (7) to MODE selector rotary switch (6). Remove knob.
(2) Remove nut (8) and lock washer (9) from MODE selector rotary switc (6) and pull out of control panel (4).
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(3) Tag and unsolder leads from MODE selector rotary switch (6) terminals. (See paragraph 4-26.) Remove
MODE selector rotary switch.
(4) Cut heat shrink tubing to approximately three-quarter inch (1.9 cm) long.
(5) Slip heat shrinkable tubing over leads.
(6) Solder leads in place on MODE selector rotary switch (6) terminals using tags and wiring diagram figure 4-
(7) Slip heat shrinkable tubing over solder connection and srhnk in place.
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(8) Remove tags.
(9) Install MODE selector rotary switch (6) into control panel (4) and secure with lock washer (9) and nut (8).
(10) Adjust MODE selector rotary switch (6) shaft to fully clockwise position and install knob (7) pointing toward
HEAT. Secure knob to shaft with setscrews.
(11) Secure control panel (4) to box (5) using four sets of screws (1), lock washers (2), and flat washers (3).
d. Adjust.
Adjust MODE selector rotary switch to desired setting.
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