Motorola ASTRO XTSTM 4000 Detailed Service Manual page 208

Index-4
Tx RF 5-26
voltage measurement 4-3
volume set error 5-13
troubleshooting waveforms
16.8 MHz buffer input and output 6-3
24.576 MHz clock 6-2
32.768 kHz clock outputs 6-4
list 6-1
receive baseband interface port (BBP) 6-6
RX serial audio port (SAP) 6-5
transmit baseband interface port (BBP) 6-7
U
UHF R2 2-2
universal asynchronous receiver/transmitter
(UART) 3-15
universal connector
option selects 3-23
universal serial bus (USB) 3-16
USB transceiver, MAKO IC 3-21
V
VCO (voltage-controlled oscillator) 3-7
VCO buffer IC (VCOBIC) U200, FGU 3-12
VOCON section
5-volt regulator U1101 3-20
audio
components 3-18
single-ended gain stage U9904 3-20
switch U20 3-20
buttons and controls 3-24
connector J1 (display and keypad) 3-14
connector J2 (encryption module, CE interface
connection and audio jack connection) 3-14
connector J3 (buttons and controls connections) 3-14
controller components 3-14
May 28, 2008
dual display
module 3-23
ESD protection circuitry 3-22
Flash memory IC U1410 3-17
interconnections 3-13
interface support components 3-20
keypad 3-23
MAKO IC U1304 3-19, 3-20
memory components 3-14
overview 3-13
Patriot IC U401 3-14
power components 3-18
power distribution 2-2
radio ce interface connector circuitry 3-22
receive audio path 3-27
static RAM (SRAM) IC U1409 3-17
system clocks 3-25
transmit audio path 3-26
VOCON section interface 3-3
voltage
measurement, troubleshooting 4-3
multiplier, PCIC 3-10
regulation, GCAP II IC U501 3-19
regulator, PCIC 3-10
regulators, transceiver 2-2
voltage-controlled oscillator (VCO) 3-7
voltages, standard supply 4-4
W
warning symbol meaning 1-2
watchdog timer, MAKO IC 3-21
waveforms, troubleshooting
16.8 MHz buffer input and output 6-3
24.576 MHz clock 6-2
32.768 kHz clock outputs 6-4
list 6-1
receive baseband interface port (BBP) 6-6
RX serial audio port (SAP) 6-5
transmit baseband interface port (BBP) 6-7
Index
6871620L01-C