53SL ES Series Mobile Radio Operating Manual April 2009
3-7
External Speaker
Section 3 - Dual Controls & External Speaker
3.2
External Speaker
An optional 4 ohm, 15 watt external speaker is available from EFJohnson (Part No. 250-
0151-006). This can be used to enhance radio audio or to provide primary audio for a
remote-mount radio. Refer to the 53SL ES Series Mobile Radio Installation guides for
additional installation information.
Figure 3.5
EFJohnson External Speaker
3.2.1
Internal / External Speaker Programming
All 53SL ES mobiles ship from the factory with the internal speaker in the control head
enabled, and audio is also routed to the 8-pin accessory connector at the rear of the radio.
If you connect an external speaker to the 8-pin accessory connector (as described in the
installation manual), the internal speaker will not be automatically disabled, and both
speakers will be active.
To disable the internal speaker, proceed as follows:
1
Power up the mobile radio
2
Press buttons F2 and F5 at the same time, and release (see Figure 3.4).
3
Rotate the Select knob, until display reads "SPKR DSABL"
4
After a short time-out period, display will read "CYCLE PWR"
5
Power the radio off and back on, and the internal speaker will be disabled.
