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+ C6592 Radio Supply Voltage 9-6V
V_SAVE C6538 LDO Output Present When Battery is Attached 2.5V
V_1.875 C6581 LDO Output 1.875V
V_1.55 R6561 LDO Output 1.55V
V_2.775D R6563 LDO Output 2775V
V_2.775_EXP R6562 LDO Output 2.775V
V_2.8_RF R6564 LDO Output 2.8V
V_5.0A R6565 LDO Output 5.0V
V_3.3 R6566 LDO Output 3.3V
V_3.0A R6567 LDO Output 3.0V
V_EXT_1.8 R2302 LDO Output 1.85V
V_SW_1.4 E6502 Switcher Output 1.4V
V_SW_3.60 C6561 Switcher Output 3.6V
V_2.23 C6573 LDO Output 2.23V
Table 4-3. Standard Operating Bias – Clock Sources
Clock
Source
Reference Description Frequency
Y6501 R6578 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 R6114 MACE Clock 4MHz
U6101 R6115 GPS RTC clock 32.768KHz
Y701
(RF board)
R6218 RF Freq synth IC (Abacus) TCXO 16.8MHz
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