June 15, 2005
6815854H01-A
5-30
Troubleshooting Charts:
Flowcharts
5.6.19 RX Back-End—Poor SINAD or No Audio (380–470 MHz and 450–520 MHz)—
Part 2 of 3
Figure 5-21. RX Back-End—Poor SINAD or No Audio (380–470 MHz and 450–520 MHz)—Part 2 of 3
No
3
3
1
R5013
= 5.0V?
No
Yes
Yes
R5013 = 0.0V?
No
Yes
Freq 2nd LO
VCO <107.4
MHz?
No
Yes
Measure
control voltage
at R5013
Inspect 2nd LO VCO
for missing parts or
solder defect
Yes
No
Visual
inspection
OK?
Repair defects
and/or replace
suspect parts
Replace
varactor diode
D6051
R5013
VOLTS DC
NOMINAL
FREQ (MHz)
0.0
1.6
4.0
5.0
68.0
71.1
75.6
77.0
Freq 2nd LO
VCO <107.4
MHz?
Содержание XTL 1500
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Страница 49: ...June 15 2005 6815854H01 A 2 12 Product Overview Controller Section Notes ...
Страница 161: ...June 15 2005 6815854H01 A 4 36 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Страница 225: ...June 15 2005 6815854H01 A 5 64 Troubleshooting Charts Flowcharts Notes ...
Страница 429: ...8 2 Flex Cable Pin Out Lists Flex Cables June 15 2005 6815854H01 A Notes ...
Страница 441: ...June 15 2005 6815854H01 A Glossary 10 Notes ...
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