Speaker (J3)
An external speaker mounted inside the case can be interfaced to the
system board through the J3 connector. Pin 1 is located at the top when
viewing the board as shown in the Quick Reference at the end of this
chapter.
J3-
Description
1
Speaker Signal
2
Ground
3
Ground
4
+5Vdc
External Battery (J4)
The J4 connector may be used for an external 4.5V to 6V battery to back
up or replace the on-board battery. When connecting the external battery,
it is very important that the connecting wire be oriented correctly. Pin 1
(positive) is located on the left side when viewing the board as shown in
the Quick Reference at the end of this chapter.
J4-
Description
1
Battery Positive
2
No connection
3
Battery Negative (ground)
4
Battery Negative (ground)
2-8
Manual No. 771924-D03, Mar. 1995
MGI486 System Board User's Guide
