Table 4-8. Power Control Dc Voltage Chart - Motorola ASTRO Digital Spectra Plus Service Manual
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Troubleshooting Procedures: Power Amplifier Procedures
If it is verified that both power set and current limit are not related to the power problem, then the
synthesizer output must be checked. A milliwatt meter connected to the TX injection cable should
indicate at least 10 mW of injection power during key-up. If this is not the case, refer to the RF board
and VCO sections of this manual for troubleshooting procedures.
RX MODE
LOCATION
LOW
J1
1
2
3
10.8
13.6
4
0
5
10.8
13.6
6
7
-
8
9
10.8
13.6
10
9.4
11
10.8
13.6
12
-
U500
1
0
2
3
0
4
5
6
1.5
7
8
9
10
11
12
6881076C25-D
Table 4-8. Power Control DC Voltage Chart
TX MODE
TYP
HI
LOW
TYP
0
0
2.0
0
2.0
7.0
16.5
10.0
13.0
0
0
9.2
9.4
16.5
10.0
13.0
0
1.2
-
-
-
0
13.0
9.3
16.5
10.0
13.0
9.6
9.9
9.4
9.6
16.5
9.8
12.8
-
-
-
0
0
0
0
3.2
0
0
0
0
0
9
3.0
4.5
1.5
3.0
0
1.5
3.0
0
1.3
3.5
0
1.3
3.5
0
0
1.3
3.5
0
0
1.2
HI
3.2
Control Voltage Limit
10.0
Drive Voltage
16.0
Current Sense +
9.8
Keyed 9.4
16.0
A+ to Command Board
Temp Sense (cutback begins at 3.3-V)
-
-
Key (no pin)
5.0
Forward Detect Voltage
16.0
A+ to Command Board
9.9
9.6-V Supply from Command Board
Current Sense - (voltage delta 150 mV)
15.8
-
-
Key (no pin or wire)
0
0
Ground
Control AMP Input
0
0
Control AMP Input (not used)
2
3.2
Control Voltage Limit (cutback at 3.3 V)
0
N.C.
4.5
Power Set from D-A (max power at 1.5 V)
4.5
Power Set Buffer Out
6.0
Coupler Buffer Out
6.0
Forward Detect Volt
Reflected Power Detect (not used)
0
6.0
Same as pin 8 (not used)
6.0
Thermister Buffer out (increases as PA gets hot)
COMMENTS
October 28, 2002
4-23
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Troubleshooting
