Low Or No Tx Injection Signal (380-470 Mhz And 450-520 Mhz); Figure 5-24. Low Or No Tx Injection Signal (380-470 Mhz And 450-520 Mhz) - Motorola ASTRO XTL 1500 Detailed Service Manual

Troubleshooting Charts: Flowcharts
5.6.22 Low or No TX Injection Signal (380–470 MHz and 450–520 MHz)
Figure 5-24. Low or No TX Injection Signal (380–470 MHz and 450–520 MHz)
6815854H01-A
START
Low or No TX
Injection Signal
Approx.
No
3.4 V on
Q5828-C?
Yes
Approx.
No
3.7 V on
Q5829-C?
Yes
Approx.
No
6.5 V on
Q5501-C?
Yes
Check RF path
from TX VCO
Check Q5828 and
DC Bias Circuitry;
replace if
necessary
Check Q5829 and
DC Bias Circuitry;
replace if
necessary
Check Q5501 and
DC Bias Circuitry;
replace if
necessary
5-33
June 15, 2005