Motorola ASTRO XTS 5000 - Page 125

November 16, 2006 6881094C31-E
5-34 Troubleshooting Charts: RX RF
RX RF—Page 4
Ye s
Fbit
< 1.2 MHz?
Measure
tuning voltage
(Vt) at R512
No
No
No
Ye s
Ye s
Vt= 3 Vdc?
Repair
defects
Replace
Varactor D501
Replace
Abacus
U500
Repair
defects
Visual
examination
OK?
4
Visual
examination
OK?
Remove SH501,
inspect
components
No
Ye s
5
5
No
Ye s
Remove SH501,
inspect clock
oscillator circuit at
U500-19, 20
Vt = 0 Vdc?
5
Clock
synthesizer
MAEPF-27473-O