6815854H01-A
June 15, 2005
Troubleshooting Charts:
Flowcharts
5-35
5.6.24 TX or RX VCO Unlock (Fail 001) (380–470 MHz and 450–520 MHz)—Part 1 of 2
Figure 5-26. TX or RX VCO Unlock (Fail 001) (380–470 MHz and 450–520 MHz)—Part 1 of 2
Frequency
Detected?
"Sniff" Frequency
near TX or RX
VCO or
infection string
TX or RX VCO
Unlock (Fail 001)
No
Yes
Check VCO
Control Voltage
at TP5796
8.2VDC
at Collector of only
one of Q5706,
Q5707, Q5708,
or Q5709
Q5710?
No
Yes
3.0VDC
on pins 5, 36,
and 13 of
U5752?
Check 9.3 Volt
supply path from
regulator U0950 in
Controller section
<.6VDC or
>11.5VDC or
drifting?
No
No
Yes
Check if VCO
is locked using
spectrum analyzer
13.5VDC
at Charge Pump
Capacitor
C5788?
No
Yes
Check Voltage
Multiplier
Circuitry
Go to
Controller
troubleshooting
charts
Go to Transmitter
or receiver
Injection string
troubleshooting
charts
Place an Inductive field probe
connected to a spectrum analyzer
near area to be sniffed.
Locked?
Yes
3VDC
at pin 4 of
U5752?
No
No
Yes
Check for short
on pin 4 to
controller or
replace U5752
Go to Transmitter
or receiver
Injection string
troubleshooting
charts
A
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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