KPA500 No Amp Power Out

[KM4VX]

My KPA500 working with my K3 correctly changes bands when band is changed from KPA500 or the K3,  but when put into "OPERATE" it only transmits at "STANDBY" power level, not the level set to transmit in "OPERATE."  I have no amp output power beyond K3. The HV  reading is 74.5 while the current level is a constant 0, never changes when sending CW or idle. I am operating on 220 and it has worked fine to date. I wonder if I have inadvertently changed some parameter. Any help would be appreciated. I reset the KPA500 to default values. Thanks Ron KM4VX

[KM4VX]

I think the problem was a loose connector cable via the KAT500  It is working now so that must have been my error. I find most problems almost always "operator error." Sometime finding the solution takes hours even days!