Motorola ASTRO Digital Spectra Plus - Page 175

6881076C25-E September 5, 2008
Troubleshooting Procedures: Power Amplifier Procedures 4-33
NOTE: For antenna switch transmit bias conditions, RF drive must be removed from PA.
29 ––––––
9.6-V Programming (N.C.)
30 ––––––
9.6-V Programming (N.C.)
31 0 0 0 0 0 0
Ground
32 10.8 13.6 16.5 10.0 13.0 16.0
Decoupled A+
33 4.0 5.0 0 0.2
TX PA Enable (from U520-25)
34 0 1.3
Control AMP one-shot
35 0 0
Lock (5-V of Synth Out of Lock)
36 0 0.8
Control AMP one-shot
37 10.8 13.6 16.3 10.0 13.0 16.0
A+ (Current Sense +)
38 10.8 13.6 16.3 10.0 13.0 16.0
Current Sense - Voltage Delta 150 mV (30 Watt
only)
39 0 9.2 9.4 9.8
Keyed 9.4-V in
40 1.5 3.0 4.5 1.5 3.0 4.5
Current Limit D-A (max current at 4.5 V)
41 0 0 0 0 0 0
Ground
42 0 2.2 9.6
Control AMP Output (Approx 1/2-V Control)
43 1.3 7.0
Loop Integrator Capacitor
44 2.1 3.2
Control AMP Reference
Q0500E 13.0 13.0
A+ – CR0500 Drop
Q0501C 12.3 12.3
VQ0500E - B/E Drop
Q0501E 0.2 0.2
V pin 23 - B/E Drop
Q0503E 0 1.5
V pin 42 - B/E Drop (TX)
Q0503C 13.6 9.0
Q0504B 13.6 12.9
A+ - B/E Drop (TX)
Table 4-11. Power Control DC Voltage Chart (Continued)
LOCATION
RX MODE TX MODE
COMMENTS
LOW TYP HI LOW TYP HI