6881076C25-E
September 5, 2008
Troubleshooting Procedures
: Power Amplifier Procedures
4-23
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.
Table 4-8. Power Control DC Voltage Chart
LOCATION
RX MODE
TX MODE
COMMENTS
LOW
TYP
HI
LOW
TYP
HI
J1
1
0
0
2.0
3.2
Control Voltage Limit
2
0
2.0
7.0
10.0
Drive Voltage
3
10.8
13.6
16.5
10.0
13.0
16.0
Current Sense +
4
0
0
0
9.2
9.4
9.8
Keyed 9.4
5
10.8
13.6
16.5
10.0
13.0
16.0
A+ to Command Board
6
0
1.2
Temp Sense (cutback begins at 3.3-V)
7
–
–
–
–
–
–
Key (no pin)
8
0
13.0
9.3
5.0
Forward Detect Voltage
9
10.8
13.6
16.5
10.0
13.0
16.0
A+ to Command Board
10
11
9.4
10.8
9.6
13.6
9.9
16.5
9.4
9.8
9.6
12.8
9.9
15.8
9.6-V Supply from Command Board
Current Sense
–
(voltage delta 150 mV)
12
–
–
–
–
–
–
Key (no pin or wire)
U500
1
0
0
0
0
0
0
Ground
2
0
3.2
Control AMP Input
3
0
0
0
0
0
0
Control AMP Input (not used)
4
0
0
2
3.2
Control Voltage Limit (cutback at 3.3 V)
5
9
0
N.C.
6
1.5
3.0
4.5
1.5
3.0
4.5
Power Set from D-A (max power at 1.5 V)
7
0
1.5
3.0
4.5
Power Set Buffer Out
8
0
1.3
3.5
6.0
Coupler Buffer Out
9
0
1.3
3.5
6.0
Forward Detect Volt
10
0
0
Reflected Power Detect (not used)
11
0
1.3
3.5
6.0
Same as pin 8 (not used)
12
0
0
1.2
6.0
Thermister Buffer out (increases as PA gets hot)
Содержание ASTRO Digital Spectra
Страница 1: ...ASTRO Digital Spectra and Digital Spectra Plus UHF VHF 800 MHz Mobile Radios Detailed Service Manual ...
Страница 2: ......
Страница 6: ...September 5 2008 6881076C25 E iv Document History Notes ...
Страница 20: ...xviii List of Tables September 5 2008 6881076C25 E Notes ...
Страница 24: ...September 5 2008 6881076C25 E xxii CommercialWarranty Notes ...
Страница 48: ...September 5 2008 6881076C25 E xlvi Model Numbering Charts and Specifications Notes ...
Страница 142: ...September 5 2008 6881076C25 E 3 82 Theory of Operation Power Amplifiers Notes ...
Страница 218: ...September 5 2008 6881076C25 E 4 76 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Страница 258: ...September 5 2008 6881076C25 E 6 14 Troubleshooting Waveforms ASTRO Digital Spectra Plus VOCON Board Waveforms Notes ...
Страница 434: ...September 5 2008 6881076C25 E Glossary 10 Notes ...
Страница 440: ...Index 6 September 5 2008 6881076C25 E Notes ...
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