TM 10-6640-238-13 3-4 Table 3-2.  Troubleshooting MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. NO ELECTRICAL POWER TO LABORATORY, PURGE SYSTEM DOES NOT OPERATE. Step 1.    Check generator set circuit breaker switch is in close position. Place generator power output switch in close position. Step 2.    Check generator set voltmeter for correct setting. Adjust voltage to 208-220 VAC. WARNING Do  not  come  in  contact  with  main  power  cable  connection  on  generator  set  with power applied to laboratory.  Death or serious injury may result. Step 3.    Check that main power cable is properly connected to generator set. a.    Turn generator set circuit breaker switch to open. b.   Shut off generator set. c.    Properly secure main power cable to connectors. Step 4.    Check that main power cable is properly connected to laboratory electrical power receptacle. WARNING Do not attempt to disconnect or connect main power cable to laboratory electrical receptacle with generator set applying power to the cable.  Death or serious injury may result. a. Place generator set circuit breaker switch to open. b. Shut off generator set. c. Make proper power cable connection. d. Start generator set. e. If purge system still fails to operate, notify unit maintenance. WARNING IF purge cycle has not taken place, do not enter Petroleum Laboratory without first allowing laboratory to vent to atmosphere via two laboratory doors for a minimum of 20 minutes.  Death or serious injury could result. 2. ALL CEILING LIGHTS FAIL TO ILLUMINATE. Check and reset circuit breaker A1CB1. If lights still fail to operate, notify unit maintenance.