TM 55-1930-209-14&P-9-1 Table C-1.  Preventive Maintenance Checks and Services for Electrical Power Systems (Continued) B - Before D - Daily Q - Quarterly D - During W - Weekly S - Semiannually A - After M - Monthly A - Annually Interval Procedures: Equipment Is Item Item to be Check for and have repaired Not Ready/ No. B   D A D   W  M   Q   S    A Inspected or adjusted as necessary Available If: CAUTION DO NOT use solvents to clean electrical components.  Solvents may leave a greasy film that reduces electrical conductivity. 3 • • • Panel Covers, c.   Check components such as panel cov- Housings and ers, housing, and metal surfaces for rust Metal Surfaces corrosion, and worn or chipped paint. Use a wire brush to remove rust and cor- rosion and paint with zinc chromate primer and finish to match surrounding area in accordance with TB 43-0144.  Do rot paint threads or labels. 4 • Failure Lights d.   Check engine failure lights by using PRESS-TO-TEST button.  H lamps do not light, change bulbs when generator being operated is off-line. 5 • All Components e.   Cleaning NOTE Avoid using solvents for cleaning Internal portions of electrical system.  Solvents often leave a greasy film on components that may reduce electrical conductivity. • 1)   Clean electrical equipment.  Avoid damaging insulation, mounting sys- tem, and hardware, or impairing elec- trical properties of item being cleaned. • 2)   Vacuum internal portions of switch- board, power panels, electrical con- trollers, inverters, battery chargers, and receptacles.  Vacuum grit, iron dust, and copper particles from enclosed areas. • 3)    Wipe dirt from external surfaces of electrical equipment with dry cheese- cloth or, if necessary, with a damp soapy cloth.  Wipe dry. • 4)   Clean circuit breakers, contacts and relays with fine sandpaper to remove black discoloration.  Do NOT use emery cloth. • 5)   Clean arc chutes on circuit breakers with a fine file.  Vacuum to remove residue. C-5