Motorola ASTRO Digital Spectra Plus Detailed Service Manual page 175
Uhf & vhf 800 mhz mobile radios
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- Service manual (426 pages) ,
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Troubleshooting Procedures: Power Amplifier Procedures
RX MODE
LOCATION
LOW
29
–
30
–
31
0
32
10.8
13.6
33
4.0
34
35
36
37
10.8
13.6
38
10.8
13.6
39
40
1.5
41
0
42
43
44
Q0500E
13.0
Q0501C
12.3
Q0501E
Q0503E
Q0503C
13.6
Q0504B
13.6
NOTE: For antenna switch transmit bias conditions, RF drive must be removed from PA.
6881076C25-E
Table 4-11. Power Control DC Voltage Chart (Continued)
TX MODE
TYP
HI
LOW
TYP
–
–
–
–
–
–
0
0
0
16.5
10.0
13.0
5.0
0
1.3
0
0
0.8
16.3
10.0
13.0
16.3
10.0
13.0
0
9.2
9.4
3.0
4.5
1.5
3.0
0
0
0
0
2.2
1.3
7.0
2.1
3.2
13.0
12.3
0.2
0.2
0
1.5
9.0
12.9
HI
–
–
9.6-V Programming (N.C.)
–
–
9.6-V Programming (N.C.)
0
0
Ground
16.0
Decoupled A+
0
0.2
TX PA Enable (from U520-25)
Control AMP one-shot
0
Lock (5-V of Synth Out of Lock)
Control AMP one-shot
16.0
A+ (Current Sense +)
16.0
Current Sense - Voltage Delta 150 mV (30 Watt
only)
9.8
Keyed 9.4-V in
4.5
Current Limit D-A (max current at 4.5 V)
0
0
Ground
9.6
Control AMP Output (Approx 1/2-V Control)
Loop Integrator Capacitor
Control AMP Reference
–
A+
CR0500 Drop
-
VQ0500E
-
V pin 23
B/E Drop
-
V pin 42
B/E Drop (TX)
-
A+
B/E Drop (TX)
COMMENTS
B/E Drop
September 5, 2008
4-33
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Table of Contents
Troubleshooting
