TM 9-4120-401-14
MODE SELECTOR ROTARY SWITCH (S1) - continued
4-28.
(2) Carefully pull control panel (4) away from control box (5) as far as harness will allow.
(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 contaot 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 input terminal (m) and output terminal (c)
(c) In COOL position continuity should be indicated between input terminal (m) and output terminal (d).
(d) In HEAT position continuity shouid 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), lock washer (9), and MODE selector rotary switch (6).
(3) Tag and unsolder leads from MODE selector rotary switch (6) terminals. Remove MODE selector rotary
(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
(7) Slip heat shrinkable tubing over solder connection and shrink in place.
(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.
NOTE
FOLLOW-ON MAINTENANCE:
4-73