June 15, 2005
6815854H01-A
5-28
Troubleshooting Charts:
Flowcharts
5.6.17 RX IF—Poor SINAD or No Audio (380–470 MHz and 450–520 MHz)—Part 2 of 2
Figure 5-19. RX IF—Poor SINAD or No Audio (380–470 MHz and 450–520 MHz)—Part 2 of 2
Level
is -3dB
referenced to
C5403?
No
No
Yes
Measure the IF
signal level
(109.65MHz)
at C5403
Measure the IF
signal level
at U5400-3
Check Y5401
No
Yes
U5400-4 > 3V
and U5400-5 < 0.2V
(Without pre-amp)
U5400-4 < 0.2V
and U5400-5 > 3V
(With pre-amp)?
Same as level
at U5400-3
(Without pre-amp)
or -10 dB referenced
to level at U5400-3
(With pre-amp)?
Yes
Refer to
troubleshooting
flow digram for
Receiver Back End
Measure the DC
voltage level
at U5400-4
and U5400-5
Replace
U5400
Troubleshoot
Q5402 and
associated
circuitry
1
Содержание XTL 1500
Страница 1: ......
Страница 5: ...iv June 15 2005 6815854H01 A This page is intentionally left blank ...
Страница 19: ...xviii List of Figures June 15 2005 6815854H01 A This page is intentionally left blank ...
Страница 25: ...June 15 2005 6815854H01 A xxiv CommercialWarranty Notes ...
Страница 35: ...June 15 2005 6815854H01 A xxxiv Model Numbering Charts and Specifications Notes ...
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 ...
Страница 451: ...Index x June 15 2005 6815854H01 A This page is intentionally left blank ...