Motorola PRO2150 Service Manual Page 90
- Page / 136
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
August 30, 2002 99R85452E01-O
8-12
UHF Band Information
: Troubleshooting Charts
8.5 Troubleshooting Charts
Figure 8-7.
Troubleshooting Flow Chart
for Receiver
Start
Very low or no 12
dB SINAD
Noise at spkr
when radio is
unsqu’d?
Is 1st LO at
C431 >2
dBm?
Inject on channel
signal at RF port,
C429
12 dB SINAD
-105 dBm?
Inject a 45.1
MHz signal at
R467
12 dB SINAD
1
Check IFIC
Q506 (see
below)
Noise at pin 9
of IFIC Q506?
Check
VCO/Synth
Inject on
channel signal
at C402
Check
harmonic
filter and
antenna path
Check external
components
connected to IFIC. If
OK, replace Q506
Check mixer,
Q407
Is 12 dB SINAD
dBm?
Check IFIC
I
s Q404 biased
properly?
RF Front & Rear
Check +5VRX and
Q404 bias circuitry
1
Is 2nd LO on
freq?
Check VDC of
all IFIC pins
Are VDC of pin
1(4.79V),2(4.17V) and
4(4.88V) of IFIC
OK?
Are voltages on
pins OK?
Check 2nd LO
XTAL and
components
Check IFIC
(see below)
Check external
components
connected to IFIC
NO
NO
YES
YES
NO
YES
YES
NO
YES
YES
NO
YES
NO
YES
YES
NO
YES
YES
NO
NO
NO
NO
2 pole filters
Check XTAL filter
F402, L411
-110 dBm?
-116
Is
12 dB SINAD
-115 dBm?
Is
Inject 45.1
MHz signal at
R413, L411
Is
- Portable Radio 1
- Table of Contents i 3
- Table of Contents iii 5
- ATTENTION! 7
- Chapter 1 Introduction 9
- 1.2.3 Piece Parts 10
- 1.2.4 Technical Support 10
- 1.2.5 Parts Identification 10
- 1.3 Radio Model Information 11
- 1.4 Radio Features 12
- CPS User 13
- Introduction 14
- : Radio Features 14
- Chapter 2 Maintenance 15
- 2.4.2 Rigid Circuit Boards 16
- 2.4.3 Flexible Circuits 17
- 2.4.4 Chip Components 17
- 2.4.5 Shields 18
- See Figure 2-1 19
- See Figure 2-2 19
- Figure 2-2 19
- See Figure 2-3 20
- See Figure 2-4 20
- 2.6.3 RF Board Disassembly 21
- 2.7.1 RF Board Reassembly 22
- See Figure 2-9 23
- See Figure 2-10 23
- See Figure 2-11 23
- Figure 2-12 24
- See Figure 24
- See Figure 2-15 24
- 12. Attach the battery 25
- Figure 2-15 25
- Figure 2-16 26
- Description 27
- 2.9 Service Aids 28
- 2.10 Test Equipment 29
- Figure 2-17 30
- Figure 2-18 30
- 2.12 IF Test Box (DSK001C702) 31
- Maintenance 32
- : IF Test Box (DSK001C702) 32
- Chapter 3 Radio Tuning 33
- Figure 3-3 34
- 3.4.1 Audio Modulation Tuning 35
- 3.4.3 Tuning Frequency 36
- Chapter 4 Radio Programming 37
- 4.3 CPS Programming 38
- 4.4 Programming 39
- 4.4.2 DPL Codes 40
- 4.4.3 Examples 40
- Radio Programming 41
- : Programming 4-5 41
- : Programming 42
- Chapter 5 Error Code Displays 43
- Error Code Displays 44
- : Error Codes 44
- Chapter 6 Accessories 45
- 6.7 Manuals 46
- 6.8 Software 46
- 7.1 Model Chart 47
- 7.2 Specifications 48
- 7.3 Theory of Operation 49
- 7.3.4 CPU / Control Section 50
- 7.3.6 Transmitter Section 51
- 7.3.7 Receiver Section 52
- 7.3.8 Battery Section 53
- 7.4 Block Diagrams 54
- 7.4.2 Controller 55
- 7.4.3 VCO 55
- 7.4.4 Transmitter 56
- 7.4.5 Receiver 56
- 7.5 Troubleshooting Charts 57
- Troubleshooting Flow Chart 58
- VHF Band Information 62
- : Troubleshooting Charts 62
- Top Side Bottom Side 64
- 8.1 Model Charts 79
- Model Description 80
- 8.2 Specifications 81
- 8.3 Theory of Operation 82
- 8.3.4 CPU / Control Section 83
- 8.3.6 Transmitter Section 84
- 8.3.7 Receiver Section 85
- 8.3.8 Battery Section 86
- 8.4 Block Diagrams 87
- 8.4.2 Controller 88
- 8.4.3 VCO 88
- 8.4.4 Transmitter 89
- 8.4.5 Receiver 89
- 8.5 Troubleshooting Charts 90
- August 30, 2002 99R85452E01-O 100
- 99R85452E01-O August 30, 2002 101
- Top Side 112
- Bottom Side 112
- 22p(R2) 56p(R1) 116
- 680K(R2) 1.5M(R1) 116
- 150K(R2)330k(R1) 116
- Glossary of Terms Glossary 127
- Glossary-2 128
- Original Codeplug 129
- Glossary-4 130
- Glossary-5 131
- Glossary-6 132
- Glossary-7 133
- Glossary-8 134
- *9985452E01* 136
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