General Operation - Motorola 38C V100 Service Manual

Level 3 Service Manual

General Operation

6881036B20
6881036B20
3
38C
The Product Family 38C Personal Communicator consists of a transceiver and a
microcomputer-controlled decoder, referred to as the controller (see Figure 1).
Messages and calls are received by way of an RF carrier that is frequency modulated
by a coded binary sequence. The circuits in the transceiver board section, through
a triple-conversion process, convert the RF signal to a low frequency signal that is
passed on to the controller. The controller processes the coded data using digital
techniques, and controls messages memory, Liquid Crystal Display (LCD), and alert
tones.
The controller processes coded messages, and forwards the messages to the trans-
mitter. The transmitter section generates a modulated RF carrier signal, amplifies
the signal, then radiates the signal through the antenna.
The following describes the general theory of operation for the Product Family 38C
Personal Communicator. See Figure 1 for a simplified, high-level functional block
diagram. Circuit descriptions are provided. Detailed functional block diagrams and
schematics for the transceiver board and controller are provided in the Supplements
listed in Related Publications.
Antenna
Board
3.6V Li Ion
Battery
Keyboard
Figure 1. Simplified Functional Block Diagram
MOTOROLA CONFIDENTIAL - PROPRIETARY
RX/TX
Switch
MAGIC
Transceiver
Whitecap
G CAP
Controller
November 20, 2000
General Operation
Vibrator
Motor
Display
Backlight
Alert
Transducer
Headset
000700-A
5