TROUBLESHOOTING CHARTS
2-5
IF Signal
at L3200?
No
RF
Signal at
T3301?
RF
Signal at
R3313?
No
RF
Signal at
C3302?
No or
Check harmonic filter L3531 & L3532,
C3532 and ant. switches D3521, D3551,
L3551, R3551, C3551, C3552, L3552
Check filter between
C3302 & C3306; pro-
gram filter to schematic
test freq and check
varactor voltages.
Inject RF into J3501
Are varactor
voltages OK?
No
Yes
Check RF amp (Q3302)
Stage.
Check filter between
C3313 & T3301.
Yes
Check T3301, T3302,
CR3301, R3321, R3322,
R3323
Yes
1st LO O/P
OK?
Locked?
Yes
Check FGU
Yes
Trace IF signal
from L3200 to
Q3200. Check for
bad XTAL filter.
No
Yes
Q3200
collector OK?
IF signal
present?
Before replacing
U3220, check
U3220 volt-
ages; trace IF
signal path.
Yes
Check for 2.9
VDC
Is R5
present?
Check Q3721,
U3701 (pin 48)
voltages and U247
No
No
No
Check U404 voltage and if
U404 can be selected by
MCU before replacing
U404.
Check varactor filter.
No
Yes
Yes
Yes
A
A
B
weak RF
RF
Signal at
C3306?
Figure 2-4
Troubleshooting Chart for Receiver (PCB 8415533H02) (Sheet 2 of 2)
Содержание GP-688
Страница 5: ...Compact Professional Portable Radios Service Maintainability Issue July 2007 ...
Страница 14: ...x THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 24: ...2 6 MAINTENANCE THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 32: ...3 8 SERVICE AIDS THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 34: ...4 2 POWER UP SELF TEST THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 38: ...iv THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 52: ...2 10 TROUBLESHOOTING CHARTS THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 64: ...3 12 CONTROLLER KEYPAD SCHEMATICS ...
Страница 88: ...3 36 PCB and Scematic Diagrams Radios with Keypad and Display EPP THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 92: ...3 40 PCB and Scematic Diagrams Radios with Keypad and Display EPP THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 96: ...3 44 PCB and Scematic Diagrams Radios with Keypad and Display EPP THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 112: ...3 60 PCB and Schematic Drawings IP67 THIS PAGE INTENTIONALLY LEFT BLANK ...
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Страница 130: ...3 78 PCB and Schematic Diagrams Radios without Keypad and Display THIS PAGE INTENTIONALLY LEFT BLANK ...
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Страница 134: ...3 82 PCB and Schematic Diagrams Radios without Keypad and Display THIS PAGE INTENTIONALLY LEFT BLANK ...
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 ...
Страница 142: ...3 90 PCB and Schematic Diagrams Radios without Keypad and Display EPP THIS PAGE INTENTIONALLY LEFT BLANK ...
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 258: ...2 8 TROUBLESHOOTING CHARTS THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 284: ...3 26 UHF1 PCB and Scematics Diagrams THIS PAGE INTENTIONALLY LEFT BLANK ...
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Страница 318: ...3 60 UHF1 PCB and Schematic Diagrams THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 328: ...3 70 UHF Narrow Band PCB Schematic Diagrams and Radio Parts List RF Board THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 334: ...3 76 UHF Narrow Band PCB Schematic Diagrams and Radio Parts List RF Board THIS PAGE INTENTIONALLY LEFT BLANK ...
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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Страница 360: ...3 4 UHF2 PCB SCHEMATICS PARTS LISTS THIS PAGE INTENTIONALLY LEFT BLANK ...
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