MTD 464 Betriebsanleitung PDF herunterladen (Seite 187)

100

101

ARMY TM 9-6115-464-34

AIR FORCE TO 35C2-3-445-2

NAVY NAVFAC P-8-624-34

(d) Remove nut (5), Iockwasher (6), flatwasher (7), screw (8), relay (9) k6, and spacer.

(e) Remove relay (11) k1.

(f) Remove rectifier (CR1).

(g) Remove resistor (R10).

(h) Remove printed circuit board (14).

(3) Cleaning, Inspection, and Repair.

(a) Clean relay assembly with filtered compressed air and a soft bristled brush.

(b) Visually inspect terminal boards for cracks, burns, and corroded or damaged terminals.

(d) Inspect resistor (R10) for burns, damaged leads and insecure mounting.

(e) Inspect silicone rectifier (CR1) for cracks, burns, and evidence of shorting.

(f) Inspect printed circuit for cold solder joints, evidence of component overheating, and damage to

the polyurethane coating.

NOTE

Prior to coating, deaerate resin by evacuating at room temperature to 5 to 10 Hg

absolute to remove air bubbles.

(g) Check all components for illegible markings.

(h) If any circuit board component must be replaced or encapsulating coating repaired or replaced,

refer to Appendix A references for detailed procedures. Repair/replace encapsulation by applying a

0.007 inch (minimum) coating of polyurethane resin (Scotchcoat 221, Minnesota Mining and Mfg.

Co. or equal).

CAUTION

Solder joints and components leads shall not protrude more than 0.094 inch beyond

surface of printed circuit board. Failure to observe this caution could result in damage

to the equipment.

WARNING

Avoid breathing fumes generated by soldering. Eye protection is required. Failure to

observe this warning could result in servere personal injury or death.

(i) Solder in accordance with requirement 5, MIL-STD-454.

(4) Assembly.

(a) Install printed circuit board (14).

(b) Install resistor (13) (CR1).

(d) Install relay (11) K1.

(e) Install spacte (10), relaly (9) K6, screw (8), flatwasher (7), lockwasher (6) and nut(5).

(f) Install terminal board (4), screw (3), nut and captive washer assembly (2 and 1).

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MTD 464 Betriebsanleitung Seite 187

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MTD 464 Betriebsanleitung Seite 187

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