Introduction
2-3
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
collector OK?
IF signal
present?
Before replacing
U301, check
U301 voltages;
trace IF signal
path.
Yes
Check for 2.6
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
Figure 3-2
Troubleshooting Chart - Receiver (Sheet 2 of 2)
Содержание GP-688
Страница 5: ...Compact Professional Portable Radios Service Maintainability Issue July 2007 ...
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Страница 34: ...4 2 POWER UP SELF TEST THIS PAGE INTENTIONALLY LEFT BLANK ...
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Страница 52: ...2 10 TROUBLESHOOTING CHARTS THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 64: ...3 12 CONTROLLER KEYPAD SCHEMATICS ...
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Страница 137: ...PCB and Schematic Diagrams Radios without Keypad and Display EPP 3 85 Complete Controller Schematic Diagram 8415885H01 ...
Страница 140: ...3 88 PCB and Schematic Diagrams Radios without Keypad and Display EPP Controller Memory Schematic Diagram 8415885H01 ...
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Страница 147: ...Compact Professional Portable Radios VHF 136 174MHz Service Information Issue July 2007 ...
Страница 150: ...iv ...
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Страница 192: ...3 20 VHF PCB Schematic Diagrams THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 195: ...VHF PCB and Schematic Diagrams EPP 3 23 VHF 136 174MHz Controls And Switches Schematic Diagram sht 1 of 2 8415533H02 ...
Страница 196: ...3 24 VHF PCB and Schematic Diagrams EPP VHF 136 174MHz Controls And Switches Schematic Diagram sheet 2 of 2 8415533H02 ...
Страница 197: ...VHF PCB and Schematic Diagrams EPP 3 25 VHF 136 174MHz Receiver Front End Schematic Diagram 8415533H02 ...
Страница 198: ...3 26 VHF PCB and Schematic Diagrams EPP VHF 136 174MHz Receiver Back End Schematic Diagram 8415533H02 ...
Страница 199: ...VHF PCB and Schematic Diagrams EPP 3 27 VHF 136 174MHz Synthesizer Schematic Diagram 8415533H02 ...
Страница 200: ...3 28 VHF PCB and Schematic Diagrams EPP VHF 136 174MHz Voltage Controlled Oscillator Schematic Diagram 8415533H02 ...
Страница 201: ...VHF PCB and Schematic Diagrams EPP 3 29 VHF 136 174MHz Transmitter Schematic Diagram 8415533H02 ...
Страница 202: ...3 30 VHF PCB Schematic Diagrams and Radio Parts List RF Radio EPP THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 208: ...3 36 VHF PCB Schematic Diagrams and Radio Parts List RF Radio EPP THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 218: ...3 46 VHF PCB Schematic Diagrams and Radio Parts List RF Board IP67 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 224: ...3 52 VHF PCB Schematic Diagrams and Radio Parts List RF Board IP67 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 237: ...Compact Professional Portable Radios UHF1 403 470MHz Narrow Band 450 470MHz Service Information Issue July 2007 ...
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Страница 328: ...3 70 UHF Narrow Band PCB Schematic Diagrams and Radio Parts List RF Board THIS PAGE INTENTIONALLY LEFT BLANK ...
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Страница 335: ...Compact Professional Portable Radios UHF2 450 527MHz Service Information Issue July 2007 ...
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Страница 348: ...1 10 THEORY OF OPERATION THIS PAGE INTENTIONALLY LEFT BLANK ...
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