Understanding circuit diagrams
Look at R1 it has a value of \$\color{red}{\text{330/1W}}\$

Compare with R39 - it has a value of \$\color{red}{\text{[100/5W]*}}\$ - why the square brackets and asterisk you might ask?

In fact all the component values associated with the 5 volt rail are enclosed in square brackets followed by an asterisk.

In my book this means "not fitted".