September 5, 2008
6881076C25-E
4-58
Troubleshooting Procedures
: Power Amplifier Procedures
8. If no failure is located from the previous checks, troubleshoot the power control circuitry.
Figure 4-9. PA Test Adapter, 40 Watt Power Amplifier
Table 4-19. DC Voltages and Input Power Chart
Test
Keyed 9.4 V
9.6 V
CONTROL
VOLTAGE
DRIVE
POWER IN
(mW)
A+
(V)
Transmit
9.4
9.6
See note
a
a. Set initially to zero. Increase value until power equals 46 Watts or 10.0 V maximum.
Do NOT exceed 10.0 V.
30
13.0
Receive
0
9.6
0
0
13.0
A+ TO COMMAND BOARD
CURRENT SENSE +
A+ TO COMMAND BOARD
CURRENT SENSE -
CONTROL VOLTAGE LIMIT
CONTROL VOLTAGE DRIVE
K9.4
FEMALE RECEPTACLE
CONNECTOR W 100 MIL
SPACING MATES TO P853
REGULATED 9.6V
V DETECT
TEMP SENSE
8
6
4
2
10
12
7
5
3
1
9
11
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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