Motorola ASTRO XTSTM 4000, Detailed Service Manual

Page: 49 / 210

6871620L01-C May 28, 2008
Theory of Operation: VOCON Section 3-23
3.2.4.3.1 Radio CE Connector and Option Selects
The CE connector is located on the bottom side of the radio. It is the external port or interface to the
outside and is used for programming and interfacing to external accessories. The CE connector
connects to the VOCON section at connector J2 via a flex circuit (UCM-CE-Audio Jack Flex) that is
routed inside the external housing. Pin assignments on the CE connector are shown in
Figure 3-8 .
Figure 3-8. CE Connector
Most of the signals are extensions of circuits described in other areas of this manual. However, there
are two option select pins (see
Table 3-4 ) used to configure special modes: Option Select 1 and
Option Select 2. These pins are controlled by accessories connected to the universal connector.
Table 3-4 outlines their functions as defined at the universal connector.
3.2.4.4 Dual Display Module
The XTS4000 radio has a dual display module within the front-flip assembly of the radio. The dual
display consists of a main display and a caller identification CID display. The main display is a 130 x
130 dot matrix liquid crystal display (LCD) whereas the CID display is a 112 x 32 dot matrix LCD. The
display module uses chip on film technology and is not field repairable.
3.2.4.5 Keypad
The keypad on the XTS4000 radio is a 3 x 3 Menu Keypad (with 4-way navigation button) and a 3 x
4 alphanumeric keypad. This keypad is realized through a flex circuit design which is housed within
the front-flip assembly of the radio. The keypad is connected to the VOCON section through
connector J1.
Table 3-4. Option-Select Functions
Function
Option
Select 1
Option
Select 2
External PTT 0 0
No Function (Normal) 1 1
External Speaker 0 1
1
3
4
17
CE_GND
CE_NC1
_VPP
CE_RS232
CE_RS232_RX_USB
CE_RTS
CE_CTS
CE_LH_DATA_KEYFAIL
CE_EXT_MIC
CE_NC3
CE_NC4
CE_OPT_SEL1
CE_OPT_SEL2
CE_EXTSPKR
CE_SPKRCOM
CE_NC5
CE_NC2