Motorola APX 7000 - Advanced Features; Logging Out

Troubleshooting Procedures: Standard Bias Table 4-3
4.3 Standard Bias Table
Table 4-2 outlines some standard supply voltages and system clocks which should be present under
normal operation. These should be checked as a first step to any troubleshooting procedure.
Table 4-2. Standard Operating Bias – DC Voltages
Name Reference Description Level
MECH_SW F_MECH_SW ON/OFF Switch. Radio on when GND GND
UNSW_B+ F_UNSW_B+ Radio Battery Voltage 9-6V
SW_B+ R6505_6 Radio Supply Voltage 9-6V
V_SAVE C6538_6 LDO Output Present When Battery is Attached 2.5V
VCC_1.875 C4001_4 LDO Output 1.875V
VCC_1.55 R6561_6 LDO Output 1.55V
VCC_2.775D R4011_4 LDO Output 2.775V
VCC_2.775 R6563_6 LDO Output 2.775V
VCC_2.8 R6564_6 LDO Output 2.8V
VCC_5.0A R6565_6 LDO Output 5.0V
VCC_3.3 R6566_6 LDO Output 3.3V
VCC_3.0A R6567_6 LDO Output 3.0V
VCC_SW_1.8 R2302_2 Switcher Output 1.875V
VCC_SW_1.4 E6502_6 Switcher Output 1.4V
VCC_SW_3.6 C6561_6 Switcher Output 3.6V
Table 4-3. Standard Operating Bias – Clock Sources
Clock
Source
Reference Description Frequency
Y6501 R6578, R6572 MAKO 24MHz & tapped into CPLD 24.576MHz
Y6502 C6541 MAKO RTC 32.768KHz
Y6601 C6601 OMAP CPU Clock 12MHz
U6302 TP6307 and
TP6308
DDR Clocks (Complementary signals) 96MHz
U6101 R6113 MACE Clock 4MHz
U6101 R6115 GPS RTC clock 32.768KHz
Y701
(RF board)
R6218 RF Freq synth IC (Abacus) TCXO 16.8MHz