TM 5-6115-434-12 Table 3-3.  Troubleshooting-Continued Malfunction Probable cause Corrective action 2 No response when master d.  Circuit breaker (CB1) tripped d.  Reset (press) circuit breaker. switch (S1) placed in or failed. Replace failed circuit break- START position. er (para 3-55j). -Continued. e.  Master switch (S1) failed e.  Replace failed master switch (S1) (para 3-55d). f.  Air intake door switch (S4) f.  Check for sticking actuator. failed. Replace failed air intake door switch (S4). g.  Improper electrical connec- g.  Tighten or replace electrical tions to start motor. connections as indicated. h.  Starter cables failed h.  Replace failed starter cables. i.  Start relay (K1) failed i.  Replace failed start relay (K1) (para 3-62a). j.  400 Hz main contactor switch j.  Place switch in open posi- (S2) not in open position tion.  Replace failed 400 Hz or failed. main contactor switch (S2) (para 3-56d). k.  60 Hz output contactor switch k.  Place switch in open posi- not in open position or tion.  Replace failed 60 Hz failed. output contactor switch (S3) (para 3-55d). l.  Centrifugal multispeed switch l.  Replace failed centrifugal assembly overspeed (110 multi-speed switch assem- percent) switch or 35 per- bly (para 3-45). cent switch open. m.  Start motor failed m.  Replace failed start motor (para 3-44). n.  Time delay relay (K4) failed n.  Replace failed relay assem- bly (para 3-61c). o.  Other causes o.  Refer other causes to direct and general support main- tenance personnel. 3 Start motor runs but a.  Start motor assembly failed a.  Replace failed start motor does not rotate engine. assembly (para 3-44). b.  Other causes b.  Refer other causes to direct and general support main- tenance personnel. 4 Engine stops motoring a.  Master switch (S1) failed a.  Replace failed master switch when master switch (S1) (para 3--55d). is released from start b.  Start relay (K1) failed b.  Replace failed start relay position. (K1) (para 3-62a). c.  Turbine holding relay (K3) c.  Replace failed relay assem- failed. bly (para 3-61c). d.  Time delay relay (K4) failed d.  Replace failed time delay relay (K4) (para 3-61c). e.  Other causes e.  Refer other causes to direct and general support person- nel. 6 Start motor fails to shut a.  Start relay (K1) failed a.  Replace failed start relay off when engine (K1) (para 3-62a). reaches 35 percent b.  Centrifugal multispeed switch b.  Replace failed centrifugal governed speed. assembly 35 percent switch multi-speed switch assem- closed. bly (para 3-45). c.  Other causes c.  Refer other causes to direct and general support main- tenance personnel. 3-7