Motorola SSETM 5000 - Manual (Page 128)

November 11, 2004 6881094C12-A
9-24 Troubleshooting Charts: RX RF
RX RF—Page 5
dac1 = dac2?
Measure preselector filter
tuning voltage dac1 and dac2.
UHF: TP401, TP405
No
Yes
Replace IF filter.
UHF: FL490
Repair
defects
6 8
Visual
inspection
OK?
Remove IF filter shield. Check IF
filter and LC matching networks.
UHF: SH403
No
Yes
Check discrete
preselector filters.
Replace
PCIC
Dac
voltages
OK?
Tune the radio across several
channels. Measure dac2,
proportional to frequency.
No
Yes
7
Replace
PCIC
MAEPF-27474-B
UHF
470 2.9
Band F (MHz) dac2 (Vdc)