Motorola ASTRO XTS 5000 Detailed Service Manual page 67

Troubleshooting Charts: RX RF
RX RF—Page 5
6
Measure prselector filter
tuning voltage dac1 and dac2.
VHF: None, TP29
UHF: TP401, TP405
700-800: TP401, TP405
Is
Yes
unit
VHF?
No
dac1 = dac2?
Yes
Tune the radio across several
channels. Measure dac2,
proportional to frequency.
Dac
voltages
OK?
Yes
VHF/UHF: Check discrete
preselector filters.
700-800: Replace FL401
or FL402.
6881094C31-C
8
No
Replace
PCIC
No Replace
PCIC
7
Remove IF filter shield. Check IF
filter and LC matching networks.
VHF: SH451
UHF: SH403
700-800: SH403
Visual
No
inspection
OK?
Yes
Replace IF filter.
VHF: FL451
UHF: FL490
700-800: FL403
Band F (MHz) dac2 (Vdc)
136 1.3
VHF
174 2.4
380 0.5
UHF
470 2.9
770 1.5
700-800
869 3.5
5-27
Repair
defects
MAEPF-27474-B
October 14, 2003