May 25, 2005 6881096C74-B
5-44 Troubleshooting Charts: Flowcharts
5.6.30 RF Power Amplifier (RFPA)—No or Low TX Power Output (380–470 MHz and
450–520 MHz)—Part 5 of 5
Table 5-6. RFPA DC Voltages
Description Location
Voltage (Vdc)
(380–470 MHz)
Voltage (Vdc)
(450–520 MHz)
A+ = 13.6 Vdc
U5501, VD1 U5501 pin 14 9.0–9.3 9.0–9.3
U5501, RFOUT U5501 pins 6 and 7 9.0–9.3 9.0–9.3
Q5502 Gate Bias R5516/C5525
node
1.8–2.0 1.8–2.1
Q5502 Drain Bias L5508/R5517
Node
9.0–9.3 9.0–9.3
Q5503 Gate Bias 1 R5520/C5539
node
2.0–2.2 1.4–1.9
Q5503 Gate Bias 2 R5521/C5540
node
2.0–2.2 1.4–1.9
Q5503 Drain Bias L5510/R5523
Node
13.0–13.6 13.0–13.6
Antenna Switch Bias
Voltage 1
L5701/C5702
node
~4.7 ~5.95
Antenna Switch Bias
Voltage 2
D5701/D5702
node
~4.0 ~5.0
Antenna Switch Bias
Voltage 3
D5703/R5701
node
~3.3 ~3.3
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