Motorola PM400 Service Manual Page 205
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- TROUBLESHOOTING
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4-14 UHF 25-40 W Band 2 PCB 8486577Z01 / Schematics
57R01
L120
120.p
C1113
39.p
C1097
39.p
C1088
1
1
IF502
IF503
C1114
39.p
C1098
120.p
COMP_B+
FILT_B+
1019447
L500
10.u
C5004
220.p
C5094
22.n
C5086
120.p
C5084
100.n
C5061
C5000
1n
28.0
VR500
C5085
22.n
C5083
120.p
C5060
100.n
C5001
10.u
C5067
1n
33.K
R5038
TEST_POINT
TP500
1
U514
FILT_SW_B+
TP555
On/Off for ATE
Spacer for T0-220
TEST_POINT
1
D502
R5028
100.K
C5092
220.p
100.n
C5063
C5062
100.n
VR504
3.3
R5050
13.K
62.K
R5031
39.p
C1132
C1096
39.p
C1085
39.p
R5000
0.
BATT_SENSE
EMERGENCY_ACCES_CONN
IF504
1
C1128
39.p
FILT_SW_B+
B+
TP556
TEST_POINT
1
FILT_B+
47.K
R5036
3.3
VR503
D511
DC_POWER_ON
Come from Pin GCB2 of ASFIC
C5037
100.n
R5062
10.K
15.K
R5030
R5049
33.K
Q506
D3_3V
150.K
R5020
EMERGENCY_SENSE
100.K
R5029
Q502
47K
10K
M6
1%
1%
GND
3
ON_OFF
2
VIN
4
VOUT
5
U501
LM2941T
ADJ
1
C5005
100.u
9.3V
9.3V
SOURCE
R5081
6.34K
R5001
1.K
C1124
39.p
39.p
C1123
39.p
C1122
39.p
C1087
39.p
C1034
C5096
220.p
220.p
C5095
C5074
120.p
9V
C5015
100n
IF505
1
C1127
100.u
C1125
39.p
9V
5V
100n
C5118
C5117
16.p
R5097
0.
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
R5099
100.K
C5115
6.8p
R5094
R5093
220.K
1
8
LM2904
U500
2
3
4
R5100
1.M
0.
R5098
220.p
C5116
1.M
5
7
8
4
LM2904
U500
6
5V
1.u
C5114
220.p
C5113
R5096
100.K
R5095
200.K
R5092
100.K
10.M
R5002
100.n
C5039
5V_CH
C5040
100.n
C5006
10.0u
C5068
120.p
100n
C5016
5V
DNP
DNP DNP
For mid_band
5V
SOURCE
SOURCE
SOURCE
5V TO LVFRACN
1u
C5042
OUTPUT
2
SENSE
3
SHUTDOWN
6
5V_TAP
5
ERROR
7
FEEDBACK
4
GND
8
INPUT
1
LP2951C
U503
5V RF Regulator
3.3V RF Regulator
3.3V to IFIC, ASFIC
3.3V Digital REGULATOR
3.3V Digital
120.p
C5064
Q505
RESET
3V
10.0u
C5008
C5070
120.p
C5018
100n
3V
MC33269D
1
GND
3
IN
2
OUT
U508
1u
C5043
C5066
120.p
D3_3V
47u
C5007
120.p
C5069
C5017
D3_3V
100n
47u
VSTBY
C5120
D501
DNP
DNP
DNP
DNP
FILT_B+
VR502
3.9
R5103
24.K
GND2
9
4
INPUT
5
OUTPUT
6
SENSE
8
SHUTDOWN
TAP
3
LP2986ILDX
U510
ERROR
7
2
FEEDBACK
1
GND1
2.2u
C5041
C5065
120.p
100n
Place near uP
C5035
VOL_INDIRECT
D3_3V
100.
R5079
2
50.K
Indirect
Audio
Volume
3
LOW
1
HIGH
6
5
4
SWITCH
S5010
2.2K
R5071
10.u
C5104
47.K
47K
47K
DNP
R5035
Q504
ONOFF_SENSE
D500
10.u
C5119
R5069
10.K
R5037
10.K
R5089
1.M
R5082
51.K
1.n
C5110
R5074
1.K
D513
VR501
5.1
C5038
100.n
R5039
100.K
Q500
IGNITION
Smart Fuse Circuit
1.M
R5085
R5083
270.K
1.n
C5111
R5073
1.K
FILT_B+
R5048
24.K
Q503
DNP
DNP
DEMOD
DNP
SOURCE
POWER SUPPLY
AUDIO
DNP
TO SHEET 1
UHF2 (438-470 MHz) 25-40 W DC and Audio Circuits (Sht 1 of 2)
- Foreword 3
- Document Copyrights 3
- Disclaimer 3
- SAFETY INFORMATION 10
- Chapter 1 12
- INTRODUCTION 12
- 3.2 Motorola Online 13
- 3.3 Mail Orders 13
- 3.4 Telephone Orders 13
- 3.5 Fax Orders 13
- 4.0 Radio Model Information 14
- 1-4 INTRODUCTION 15
- Chapter 2 16
- MAINTENANCE 16
- 2-2 MAINTENANCE 17
- 2-4 MAINTENANCE 19
- 2-6 MAINTENANCE 21
- 2-8 MAINTENANCE 23
- SERVICE AIDS 24
- 2.0 Test Equipment 25
- OVERVIEW 30
- 1-2 OVERVIEW 31
- 2.3 Keypad Keys 33
- 2.6 Speaker 34
- 3.1 Power Supplies 35
- 3.2 SPI Interface 35
- 3.3 Keypad Keys 36
- 3.4 LCD Driver 36
- 3.7 Speaker 37
- (see table on next page) 39
- Key_Row Voltage TP402 40
- 2.1 Control Head Failure 41
- SHOWN FROM SIDE 1 46
- Control Head CM200 Schematic 47
- Bottom Side 49
- Top Side 49
- UHF2, 1-25 W, 438-470 MHz 58
- mP U403 90
- OL 79B02969C76-O 97
- OL 79B02969C78-O 97
- SHOWN FROM SIDE 2 98
- OL 79B02969C77-O 98
- OL 79B02969C79-O 98
- DC & AUDIO 100
- SHEET 2 OF 8 102
- 73D02968C74-O 102
- FRACN_63A27 103
- SHEE 5 OF 8 104
- TO SHEET 1 105
- SHEET 6 OF 8 106
- SHEET 7 OF 8 108
- SHEET 8 OF 8 110
- SHEET 3 OF 8 111
- List 1-25 W 112
- COMPARTMENT 123
- Option Board 126
- Keypad/Display 126
- CM200/CM300/PM400 150
- Computer Software Copyrights 151
- Table of Contents 152
- UHF2, 25-40 W, 438-470 MHz 156
- 2.0 Technical Specifications 157
- Transmitter 158
- Receiver 158
- THEORY OF OPERATION 160
- 2.2 Receiver Back End 161
- 3.3 Final Stage 162
- 3.4 Directional Coupler 162
- 3.5 Antenna Switch 162
- 3.6 Harmonic Filter 163
- 3.7 Power Control 163
- 4.1 Reference Oscillator 163
- 4.2 Fractional-N Synthesizer 164
- 4.4 Synthesizer Operation 166
- 5.1 Radio Power Distribution 167
- 5.2 Protection Devices 169
- 5.3 Automatic On/Off 169
- 5.6 SBEP Serial Interface 171
- 2-14 THEORY OF OPERATION 173
- 7.0 Transmit Audio Circuits 174
- 2-16 THEORY OF OPERATION 175
- 8.1 Sub-Audio Data (PL/DPL) 176
- 8.2 High Speed Data 177
- 9.1 Squelch Detect 178
- 2-20 THEORY OF OPERATION 179
- 9.4 Handset Audio 180
- 10.2 Alert Tone Circuits 181
- Chapter 3 182
- TROUBLESHOOTING CHARTS 182
- uP U403 188
- 3-8 TROUBLESHOOTING CHARTS 189
- Chapter 4 192
- Internal SPKR+ Jumper 197
- MRF1513’s Thermal pad 199
- LVFRACN Shield 201
- VCOBIC Shield 202
- FRONT-END SHIELD 203
- MIXER SHIELD 203
- IFAMP_DEC1 204
- IFAMP_DEC2 204
- AUDIOOUT 204
- AUDIO_FEED 204
- POWER SUPPLY 205
- TO SHEET 2 208
- UHF3, 25-40 W, 465-495 MHz 256
- VCOBIC Shield 330
- VCO Shield 330
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