6881094C31-E
November 16, 2006
Troubleshooting Charts:
RX RF
5-35
RX RF—Page 5
dac1 = dac2?
Measure prselector filter
tuning voltage dac1 and dac2.
VHF & UHF2: None, TP29
UHF R1: TP401, TP405
700-800: TP401, TP405
No
Yes
Is unit
VHF or UHF2?
No
Yes
Replace IF filter.
VHF & UHF2: FL451
UHF R1: FL490
700-800: FL403
Repair
defects
6
8
Visual
inspection
OK?
Remove IF filter shield. Check IF
filter and LC matching networks.
VHF & UHF2: SH451
UHF R1: SH403
700-800: SH403
No
Yes
VHF/UHF: Check discrete
preselector filters.
700-800: Replace FL401
or FL402.
Replace
PCIC
Dac
voltages
OK?
Tune the radio across several
channels. Measure dac2,
proportional to frequency.
No
Yes
7
Replace
PCIC
MAEPF-27474-C
VHF
UHF R1
UHF R2
700-800
136
174
380
470
450
520
770
869
1.3
2.4
0.5
2.9
1.2
3.6
1.5
3.5
Band F (MHz) dac2 (Vdc)
Summary of Contents for ASTRO XTS-5000
Page 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Page 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Page 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Page 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Page 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Page 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Page 373: ...Index 6 November 16 2006 6881094C31 E Notes ...