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Troubleshooting Charts: RX RF
RX RF–Page 5
6
Measure preselector filter
tuning voltage dac2 at
VHF: C413
UHF: C420
Tune the radio across several
channels. Measure dac2,
proportional to frequency.
Dac
voltages
OK?
Yes
Check discrete
preselector filters.
6871620L01-C
8
Replace
No
PCIC
7
Check IF filter and
LC matching networks.
Visual
No
inspection
OK?
Yes
Replace IF filter.
VHF/ UHF: FL490
Band
F (MHz) dac2 (Vdc)
VHF
136
0.9
174
2.1
UHF
380
0.9
470
3.1
5-25
Repair
defects
May 28, 2008
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Table of Contents
Troubleshooting
