Motorola ASTRO XTS 5000 Detailed Service Manual page 105

Troubleshooting Charts: RX RF
RX RF—Page 5
6
Measure prselector filter
tuning voltage dac1 and dac2.
VHF & UHF2: None, TP29
UHF R1: TP401, TP405
700-800: TP401, TP405
Is unit
Yes
VHF or UHF2?
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-D
8
No
Replace
PCIC
No
Replace
PCIC
7
Remove IF filter shield. Check IF
filter and LC matching networks.
VHF & UHF2: SH451
UHF R1: SH403
700-800: SH403
Visual
inspection
OK?
Yes
Replace IF filter.
VHF & UHF2: FL451
UHF R1: FL490
700-800: FL403
Band F (MHz) dac2 (Vdc)
136
VHF
174
UHF R1 380
470
UHF R2 450
520
770
700-800
869
5-27
No Repair
defects
1.3
2.4
0.5
2.9
1.2
3.6
1.5
3.5
MAEPF-27474-C
July 21, 2004