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
IGN_X* Mako_IGN_X ON/OFF Switch. Radio on when GND GND
UNSW_B+ F_UNSW_B+ Radio Battery Voltage 6–9V
SW_B+ C6593 Radio Supply Voltage 6–9V
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 2.775V
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_1.85 R6570 LDO Output 1.85V
V_SW_1.4 C6570 Switcher Output 1.4V
V_SW_3.60 C6561 Switcher Output 3.6V
V_2.23 C6573 LDO Output 2.23V
ON_OFF_SWITCH MECH_SW ON/OFF Switch. Radio on when GND GND
Note:
* = Not applicable to APX 2000/ APX 4000 (Two Knobs).
** = Applicable to APX 2000/ APX 4000 (Two Knobs) only.
Table 4-3. Standard Operating Bias – Clock Sources
Clock
Source
Reference Description Frequency
Y6501 R6533 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
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