November 16, 2006
6881094C31-E
5-40
Troubleshooting Charts:
TX RF (UHF R1/700-800 MHz)
TX RF (UHF R1/700-800 MHz)—Page 2
MAEPF-27420-B
RAWB+
about
7.2 Vdc?
Measure
RAWB+
at Q107-drain
No
No
No
Yes
Yes
Yes
Check
continuity
V.gate
about 2 to
3 Vdc?
Check
continuity
DC bias is OK,
control is OK,
RFIN is OK,
PA has low gain
Replace
Q107
No
Yes
Measure RF
level at
pin 6 of Q107
Is
unit
VHF?
No
Yes
Remove SH101
and check for
parts off pad
Level
about
+35 dBm?
Replace U102.
For VHF, check under
SH101. if all parts soldered,
replace U102.
Measure
gate bias
at L108
RAWB+
about
7.2 Vdc?
Measure
RAWB+
at U102-6
No
No
Yes
Yes
TX7V
about
7.2 Vdc?
Check
continuity
Measure
Vgate at TP111,
normally 4 to
5.5 Vdc
Measure
TX7V at
U102-14
DC bias is OK,
control is OK,
RFIN is OK, driver
has low gain
Vgate
> 4 Vdc?
2
1
3
4
Содержание ASTRO XTS-5000
Страница 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Страница 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Страница 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Страница 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Страница 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Страница 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Страница 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Страница 355: ...8 180 Schematics Board Overlays and Parts Lists VOCON Boards November 16 2006 6881094C31 E Notes ...
Страница 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Страница 373: ...Index 6 November 16 2006 6881094C31 E Notes ...