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
F
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
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
U6101
R6115
GPS RTC clock
32.768KHz
Y701
(RF board)
R6218
RF Freq synth IC (Abacus) TCXO
16.8MHz
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......