September 5, 2008
6881076C25-E
4-32
Troubleshooting Procedures
: Power Amplifier Procedures
U0500
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
0
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
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 Voltage
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)
13
0
0
1.2
6.0
Thermister Buffer in
14
5.0
5.0
5-V Sense Input (follows pin 20 ±0.1 V)
15
4.9
5.0
5.7
4.9
5.0
5.7
5-V Current Limit (limits at 5.7 V)
16
5.0
5.7
6.4
5.0
5.7
6.4
5-V Series Pass Drive (6.4 at max current)
17
9.5
9.6
9.9
9.5
9.6
9.9
9.6-V Sense Input
18
7
7
5-V Reg. Compensation Capacitor
19
5.7
5.7
N.C.
20
4.9
5.0
5.1
4.9
5.0
5.1
5-V Reference Input (UNSW5-V)
21
1.2
1.2
9.6-V Reg. Compensation Capacitor
22
0
0
N.C.
23
0.9
9.6
1.2
9.6
9.6-V Series Pass Drive
24
2.9
3.3
Regulator Enable/Compensation
25
–
–
–
–
–
–
9.6-V Programming (N.C.)
26
0
0
N.C.
27
13.6
13.6
N.C.
28
–
–
–
–
–
–
9.6-V Programming (N.C.)
Table 4-11. Power Control DC Voltage Chart (Continued)
LOCATION
RX MODE
TX MODE
COMMENTS
LOW
TYP
HI
LOW
TYP
HI
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 ...
Страница 441: ......