It's hard to believe how hot some of these things run "normally". But you said it was smoking, which it should not.
The voltage at the zener will tell you. If you have 33V there, then the heat is the normal amount. If there is a fault, you will not have 33V at the zener, but some lower voltage. (this is assuming the other end of R1 has it's proper approx. 45V)
The voltage at the zener will tell you. If you have 33V there, then the heat is the normal amount. If there is a fault, you will not have 33V at the zener, but some lower voltage. (this is assuming the other end of R1 has it's proper approx. 45V)