[Tex/LaTex] Changing \renewcommand{\familydefault}{…} back to default

fontskoma-script

I just have a quick question: how can I change this command back to the default?

\usepackage[scaled=0.92]{helvet}
\renewcommand\familydefault{phv}

Addendum – Here's the MWE:

\documentclass[12pt,a4paper,twoside,openright]{scrbook} 
\usepackage[scaled=0.92]{helvet} 
\renewcommand\familydefault{phv} 
\begin{document} 
\chapter{Test} 
\section{Test2} 
This is normal Text 
\end{document}

Best Answer

The scrbook class uses a sans serif font for the section titles (which is Computer Modern Sans Serif and not Helvetica); to get roman section titles use

\addtokomafont{sectioning}{\rmfamily}

The string sectioning can also be disposition (with the same effect).