(3) Preset controls. Presetting the intercom component controls is critical and must be
performed accurately to obtain a valid evaluation.
(a) AM-1780. See Figure 18. Open the POWER lamp lens cover (A) (turn
counterclockwise [CCW] to stop), and turn the INSTALLATION SWITCH (B) to INT ONLY.
Figure 18. AM-1780.
(b) Control box C-2298. See Figure 19. Turn the VOLUME control (A) fully clockwise
(CW)(maximum), and turn the MONITOR switch (B) to ALL.