TM 55-1930-209-14&P-19 Table 9-3.  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 ITEM PROCEDURES EQUIPMENT ITEM TO BE CHECK FOR AND HAVE IS NOT READY/ NO. INSPECTED REPAIRED OR ADJUSTED AVAILABLE IF B   D   A   D  W  M   Q   S   A AS NECESSARY 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 acordance with TB 43-0144.  Do not paint threads or labels. 4 · Failure Lights d. Check engine failure lights by using PRESS-TO-TEST button. If 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. 9-5