5-22
Troubleshooting Charts:
Main Display Failure
5.5
Main Display Failure
No Display
End
Check DC on following
Signal
V_Ext_1.86
V_2.775D
Replace LCD
Check the following signals:
Signal
F_DISP_RW
F_DISP_DATA_CMD
F_DISP_RW_EN
OMAP_RESET
Is 6 < V < 9
Check U6504 circuitry.
Signals
Correct?
Check U6302 and U6101
display lines. Change faulty
part.
Verify connectors from J2302 to
front kit flex.
Problem still persist?
Connectors
Good?
Replace chassis subassembly
replace board or flex
with bad connector
Yes
No
Yes
No
Yes
No
Yes
No
Probe Point
TP2005 on keypad
TP2008 on keypad
Level
0V
1.85V. Hi = Data. Low = Command
1.85V. 4MHz Square
1.85V
Probe Point
R2135
R2147
R2142
OMAP_RESET_TP
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: ......