Removal of Pluck-Out Electron Tubes and Transistors on the Printed Circuit Board PCB Z101 (25)

TM 11-6665-209-40

f. Removal of Meter M101 (52). (Figure 3-2)

(1) Remove two screws (37), two Iockwashers (36), from rear of meter M101 (52)

and remove terminal board TB101 (28) from meter.

(2) Remove spring (43) from stud (27).

(3) Loosen two set screws (44), and remove sprocket wheel segment (45) from

meter.

(4) Unsolder and tag wires from rear of meter M101 (52).

(5) Remove screw (46), lock washer (47), flat washer (48), terminal board TB2 (49),

supporting post (50) and flat washer (51) from rear of meter and remove meter

from front panel assembly (1).

g. Replacement of Meter M101.

(1) Position meter M101 (52), on front panel assembly (1) and replace hardware

removed in subparagraph e (5) above.

(2) Place lock washer (47), flat washer (48), terminal board TB2 (49), supporting

post (50) removed in subparagraph f (5) above.

(3) Replace wires removed in subparagraph e (4) above,

(4) Position terminal board TB101 (28), on meter M101 (52) and secure with hard-

ware removed in subparagraph e (1) above.

(5) Replace sprocket wheel segment (45) on meter M101 shaft.

(6) Holding sprocket wheel segment (45) in position (chain tight), tighten set

screws (44) and reconnect spring (43) to stud (27).

(7) Align meter window scale with switch setting, and tighten set screws (44).

h. Removal of the Mechanical Portion of Selection Switch S102 in the 0.5 Position.

(Figure 3-1)

(1) Remove one set screw (13) from knob (12). Pull upwards on knob to remove.

(2) Remove two gaskets (11) from under knob (12).

(3) Remove retainer nut seal (10). Pull switch out from bottom of front panel

assembly (1).

(4) Remove two extension and support screws (18), two nuts (22), two lock

washers (21), two long space tubes (20), two flat washers (19) from mechanical

switch (30).

(5) Remove sprocket wheel (26) from switch shaft by removing one set screw (24).

i. Replacement of the Mechanical Portion of Selection Switch S102.

(1) Replace and secure extension support screws (18) through mechanical switch

S102 (30) with all hardware removed in subparagraph g (4) above.

(2) Replace mechanical switch (30) with location post into indentation of front

paneI assembly (1) and secure with retainer nut seal (10) and gaskets (11)

removed in subparagraphs h (2) and h (3) above.

j. Replacement of Printed Circuit Board (PCB) Z101. (Figure 3-1)

(1)

Replace the connector plug (23) to battery compartment.

(2)

Position the PCB on the five supporting studs (27).

(3)

Replace and secure all terminal lugs removed in subparagraph d (3) above.

(4)

Replace the pressure spring (35), pressure plate (34) and four plastic extension

shafts (33) and secure PCB (25) with hardware removed in subparagraph d (1)

above.

k. Replacement of Front Panel Assembly. Replace front panel assembly (1) and

secure with hardware removed in subparagraph a above.

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