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Motorola PM400 Service Manual Page 23
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TROUBLESHOOTING
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2-8
MAINTENANCE
Notes
1
2
...
18
19
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21
22
23
24
25
26
27
28
...
349
350
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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