September 5, 2008
6881076C25-E
4-60
Troubleshooting Procedures
: Power Amplifier Procedures
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.)
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)
Table 4-20. 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: ......