Simplified assembly and automatic testing of components in electro-optical systems for reading coded indicia

An in-housing optical adjustment arrangement for use in a system for electro-optically reading indicia, comprising:

• a) a chassis having a body portion generally lying in a first plane;
• b) a printed circuit board supported by the chassis and generally lying in a second plane elevated above the first plane, said circuit board having holes extending therethrough;
• c) an optical assembly including a light emitter component for emitting a light beam, a light sensor component for detecting light from the indicia over a field of view, and a scanner including a light reflector component for scanning at least one of said light beam and said field of view;
• d) means extending through the holes for supportably mounting the emitter component, the sensor component and the reflector component on the chassis at accessible locations elevated above the first plane and the second plane with accessibility from above and below the board;
• and
• e) means for automatically adjusting at least one of the components.