2-4
TROUBLESHOOTING CHARTS
4.0
Troubleshooting Flow Chart for Receiver (Models with PCB
8486686Z02) (Sheet 2 of 2)
IF Signal at
L311?
No
RF Signal
at T301?
RF Signal
at C310?
No
RF Signal
at C307?
No
RF Signal
at C301?
No or
Check harmonic filters L101 & L102 and
ant. switches CR101, CR102, L104
Check filter between
C301 & C307; program
filter to schematic test
freq and check varactor
voltages.
Inject RF into J101
Are varactor
voltages OK?
No
Yes
Check RF amp (Q301)
Stage.
Check filter between
C310 & T301.
Yes
Check T301, T302,
CR306, R308, R309
Yes
1st LO O/P
OK?
Locked?
Yes
Check FGU
Yes
Trace IF signal
from L311 to
Q302. Check for
bad XTAL filter.
No
Yes
Q302 collec-
tor OK?
IF signal
present?
Before replacing
U301, check
U301 voltages;
trace IF signal
path.
Yes
Check for 3.0
VDC
Is R5
present?
Check Q210, U201
(pin 48) voltages and
U247
No
No
No
Check U404 voltage.
U404 can be selected by
MCU before replacing
U404.
Check varactor filter.
No
Yes
Yes
Yes
A
A
B
weak RF
Содержание GP series
Страница 1: ...Professional Portable Radio Detailed Service Manual 6866558D03 P ...
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Страница 5: ...Professional Radio GP Series Service Maintainability Issue July 2007 ...
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Страница 32: ...4 2 Error Codes Notes ...
Страница 33: ...Professional Radio GP Series Keypad and Flex Service Information Issue July 2007 ...
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Страница 59: ...Professional Radio GP Series Power Distribution and Controller Service Information Issue July 2007 ...
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Страница 98: ...3 30 Controller Set 4 PCB 8416256H02 UHF Controller Audio Power Amplifier Schematic Diagram ...
Страница 100: ...3 32 Controller Set 5 PCB 8486743Z02 UHF Intentionally left blank Controller ASFIC ON_OFF Schematic Diagram ...
Страница 101: ...Controller Set 5 PCB 8486743Z02 UHF 3 33 Controller Micro Processor Schematic Diagram ...
Страница 102: ...3 34 Controller Set 5 PCB 8486743Z02 UHF Controller Interface Schematic Diagram ...
Страница 103: ...Controller Set 5 PCB 8486743Z02 UHF 3 35 Controller Audio Power Amplifier Schematic Diagram ...
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Страница 108: ...3 40 Controller Schematics Set 6 PCB 8415234H05 Narrow Band THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 109: ...Professional Radio GP Series UHF 403 470MHz Narrow Band 450 470MHz Service Information Issue July 2007 ...
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Страница 260: ...3 116 Circuit Board Schematic Diagrams and Parts List PCB No 8415234H05 THIS PAGE INTENTIONALLY LEFT BLANK ...
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Страница 293: ...UHF PCB 8486743Z02 Schematics 3 149 UHF 403 470 MHz Receiver Front End Schematic Diagram ...
Страница 294: ...3 150 UHF PCB 8486743Z02 Schematics UHF 403 470 MHz Receiver Back End Schematic Diagram ...
Страница 295: ...UHF PCB 8486743Z02 Schematics 3 151 UHF 403 470 MHz Synthesizer Schematic Diagram ...
Страница 296: ...3 152 UHF PCB 8486743Z02 Schematics UHF 403 470 MHz Voltage Controlled Oscillator Schematic Diagram ...
Страница 297: ...UHF PCB 8486743Z02 Schematics 3 153 UHF 403 470 MHz Transmitter Schematic Diagram ...
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Страница 325: ...Professional Radio GP Series UHF2 450 527MHz Service Information Issue July 2007 ...
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Страница 441: ...Professional Radio GP Series 800 MHz 806 870MHz Service Information Issue July 2007 ...
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