Motorola Portable Radio Ep450 Detailled Hkln4216c Manual

							*H
KLN42
16C
*
HKLN421
6C
EP4
50
™
Po
rtab
le
 R
ad
io
Detailed  Service Manual
MOTOROLA and the St
ylized M Lo
go are re
gistered in the U.S. Patent and Trademark Office
.
All other product or service names are the propert
y of their respective owners
.
© Motorola, Inc. 2005© 
						

							EP450 Portable Radio
Detailed Service Manual
 VHF 136-162 MHz
VHF 146-174 MHz
UHF 403-440 MHz
UHF 438-470 MHz
UHF 465-495 MHz
UHF 490-527 MHz
Motorola, Inc.
1301 E. Algonquin Road
Schaumburg, IL 60196
HKLN4216C 
						

							ii
Foreword
This manual is intended for use by service technicians familiar with portable two-way radios. It contains 
service information required for the equipment described and is current as of the printing date. Changes which 
occur after the printing date may be incorporated by a complete Manual revision or alternatively as additions
Product Safety and RF Exposure Compliance  
AT T E N T I O N !
This radio is restricted to occupational use only to satisfy FCC RF energy exposure requirements. 
Before using this product, read the RF energy awareness information and operating instructions in the 
Product Safety and RF Exposure booklet enclosed with your radio (Motorola Publication part number 
6881095C98) to ensure compliance with RF energy exposure limits.
For a list of Motorola-approved antennas, batteries, and other accessories, visit the following web site which 
lists approved accessories: http://www.motorola.com/cgiss/index.shtml.
Computer Software Copyrights
The Motorola products described in this manual may include copyrighted Motorola computer programs stored 
in semiconductor memories or other media. Laws in the United States and other countries preserve for  
Motorola certain exclusive rights for copyrighted computer programs, including, but not limited to, the  
exclusive right to copy or reproduce in any form the copyrighted computer program. Accordingly, any  
copyrighted Motorola computer programs contained in the Motorola products described in this manual may  
not be copied, reproduced, modified, reverse-engineered, or distributed in any manner without the express  
written permission of Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant  
either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent  
applications of Motorola, except for the normal non-exclusive license to use that arises by operation of law in  
the sale of a product.
Document Copyrights
No duplication or distribution of this document or any portion thereof shall take place without the express  
written permission of Motorola. No part of this manual may be reproduced, distributed, or transmitted in any  
form or by any means, electronic or mechanical, for any purpose without the express written permission of  
Motorola.
Disclaimer
The information in this document is carefully examined, and is believed to be entirely reliable. However, no  
responsibility is assumed for inaccuracies. Furthermore, Motorola reserves the right to make changes to any  
products herein to improve readability, function, or design. Motorola does not assume any liability arising out 
of the applications or use of any product or circuit described herein; nor does it cover any license under its  
patent rights nor the rights of others.
MOTOROLA and The Stylized M logo are trademarks of Motorola, Inc.
All other product or service names are the property of their respective owners.
© 2005 Motorola, Inc. All rights reserved. Printed in U.S.A. Note:
Before using this product, read the operating instructions for safe usage contained in the 
Product Safety and RF Exposure booklet enclosed with your radio.
!
C a u t i o n 
						

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HKLN4216CJune, 2005
Table of Contents
Foreword ..................................................................................................................................................... ii
Product Safety and RF Exposure Compliance ............................................................................................ ii
Computer Software Copyrights ................................................................................................................... ii
Document Copyrights .................................................................................................................................. ii
Disclaimer .................................................................................................................................................... ii
List of Figures ..............................................................................................................................................x
List of Tables ............................................................................................................................................ xiv
Related Publications ................................................................................................................................. xiv
Chapter 1 Test Equipment, Service Aids, and  Service Tools .......... 1-1
1.1 Test Equipment.............................................................................................................................. 1-1
1.2 Service Aids ................................................................................................................................... 1-2
Chapter 2 DC Power Distribution ........................................................ 2-1
2.1 DC Regulation and Distribution ..................................................................................................... 2-1
Chapter 3 Controller Theory of Operation.......................................... 3-1
3.1 Controller ....................................................................................................................................... 3-1
3.1.1 Microprocessor Circuitry ...................................................................................................3-1
3.1.1.1 Memory Usage ........................................................................................................ 3-2
3.1.1.2 Control and Indicator Interface ................................................................................ 3-2
3.1.1.3 Serial Bus Control of Circuit Blocks ......................................................................... 3-2
3.1.1.4 Interface to RSS Programming ................................................................................ 3-3
3.1.1.5 Storage of Customer-Specific Information ............................................................... 3-3
3.1.1.6 Sensing of Externally-Connected Accessories ........................................................ 3-3
3.1.1.7 Microprocessor Power-Up, Power-Down and Reset Routine .................................. 3-3
3.1.1.8 Boot Mode Control ................................................................................................... 3-4
3.1.1.9 Microprocessor 7.3975 MHz Clock .......................................................................... 3-4
3.1.1.10 Battery Gauge..........................................................................................................3-4
3.1.2 Audio Circuitry .................................................................................................................. 3-4
3.1.2.1 Transmit and Receive Low-Level Audio Circuitry .................................................... 3-4
3.1.2.2 Audio Power Amplifier ............................................................................................. 3-5
3.1.2.3 Internal Microphone Audio Voice Path .................................................................... 3-5
3.1.2.4 PTT Circuits .............................................................................................................3-5
3.1.2.5 VOX Operation ........................................................................................................ 3-6
3.1.2.6 Programming and Flashing Through Microphone Jack ........................................... 3-6
Chapter 4 136-162 MHz VHF Theory Of Operation............................ 4-1
4.1 Introduction .................................................................................................................................... 4-1
4.2 VHF Receiver ................................................................................................................................ 4-1
4.2.1 Receiver Front-End........................................................................................................... 4-1
4.2.2 Receiver Back-End ........................................................................................................... 4-2
4.3 VHF Transmitter ............................................................................................................................ 4-3
4.3.1 Transmit Power Amplifier..................................................................................................4-3 
						

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4.3.2 Antenna Switch ................................................................................................................. 4-3
4.3.3 Harmonic Filter.................................................................................................................. 4-3
4.3.4 Antenna Matching Network ............................................................................................... 4-4
4.3.5 Power Control ................................................................................................................... 4-4
4.4 VHF Frequency Generation Circuitry ............................................................................................. 4-4
4.4.1 Fractional-N Synthesizer...................................................................................................4-5
4.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 4-6
4.5 Keypad ........................................................................................................................................... 4-7
Chapter 5 146-174 MHz VHF Theory Of Operation ............................ 5-1
5.1 Introduction .................................................................................................................................... 5-1
5.2 VHF Receiver................................................................................................................................. 5-1
5.2.1 Receiver Front-End ........................................................................................................... 5-1
5.2.2 Receiver Back-End ........................................................................................................... 5-2
5.3 VHF Transmitter............................................................................................................................. 5-3
5.3.1 Transmit Power Amplifier ..................................................................................................5-3
5.3.2 Antenna Switch ................................................................................................................. 5-3
5.3.3 Harmonic Filter.................................................................................................................. 5-3
5.3.4 Antenna Matching Network ............................................................................................... 5-4
5.3.5 Power Control ................................................................................................................... 5-4
5.4 VHF Frequency Generation Circuitry ............................................................................................. 5-4
5.4.1 Fractional-N Synthesizer...................................................................................................5-5
5.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 5-6
5.5 Keypad ........................................................................................................................................... 5-7
Chapter 6 VHF Troubleshooting Tables ............................................. 6-1
6.1 Troubleshooting Table for Receiver ............................................................................................... 6-1
6.2 Troubleshooting Table for Synthesizer .......................................................................................... 6-3
6.3 Troubleshooting Table for Transmitter ........................................................................................... 6-4
6.4 Troubleshooting Table for Board and IC Signals ........................................................................... 6-7
Chapter 7 VHF Schematic Diagrams, Overlays, and Parts Lists...... 7-1
7.1 Introduction .................................................................................................................................... 7-1
7.1.1 Notes For All Schematics and Circuit Boards................................................................... 7-1
7.1.2 Six Layer Circuit Board ..................................................................................................... 7-3
7.2 Speaker and Microphone Schematic .............................................................................................7-3
7.2.1 Speaker and Microphone Parts List .................................................................................. 7-3
Chapter 7 VHF 136-162 MHz (8486769Z02-A) Schematic Diagrams,
 Overlays, and Parts Lists .................................................. 7-5
Figure 7-3. VHF (136-162 MHz) Radio Circuit Block Interconnect Diagram (8486769Z02-A) ........... 7-5
Figure 7-4. VHF (136-162 MHz) Receiver Front End Schematic Diagram (8486769Z02-A) .............. 7-6
Figure 7-5. VHF (136-162 MHz) Receiver Back End Schematic Diagram (8486769Z02-A) .............. 7-7
Figure 7-6. VHF (136-162 MHz) Synthesizer Schematic Diagram (8486769Z02-A) .......................... 7-8
Figure 7-7. VHF (136-162 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486769Z02-A)................................................................................................. 7-9
Figure 7-8. VHF (136-162 MHz) Transmitter and Power Control Schematic 
Diagram (8486769Z02-A) ............................................................................................... 7-10 
						

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HKLN4216CJune, 2005
Figure 7-9. VHF (136-162 MHz) Controller Interconnect Schematic Diagram (8486769Z02-A) ...... 7-11
Figure 7-10. VHF (136-162 MHz) Microprocessor  Circuitry Schematic Diagram (8486769Z02-A) ... 7-12
Figure 7-11. VHF (136-162 MHz) Audio Circuitry Schematic Diagram (8486769Z02-A) ................... 7-13
Figure 7-12.  VHF (136-162 MHz) DC Regulation Schematic Diagram (8486769Z02-A) .................. 7-14
Figure 7-13. VHF (136-162 MHz) Keypad Board Schematic Diagram (8466565A03-B).................... 7-15
Figure 7-14. VHF (136-162 MHz) Board Top Side View (8486769Z02-A) ......................................... 7-16
Figure 7-15. VHF (136-162 MHz) Board Bottom Side View (8486769Z02-A) .................................... 7-17
Figure 7-16. VHF (136-162 MHz) Keypad Board (8466565A03-B) .................................................... 7-18
VHF (136-162 MHz) Radio Parts List (8486769Z02-A) ......................................................................... 7-19
VHF (136-162 MHz) Keypad Board Parts List  (8466565A03-B) .......................................................... 7-22
Chapter 7 VHF 136-162 MHz Schematic Diagrams, Overlays, 
and Parts Lists (8486769Z04-C) ....................................... 7-23
Figure 7-17. VHF (136-162 MHz) Radio Circuit Block Interconnect Diagram (8486769Z04-C) ......... 7-23
Figure 7-18. VHF (136-162 MHz) Receiver Front End Schematic Diagram (8486769Z04-C) ........... 7-24
Figure 7-19. VHF (136-162 MHz) Receiver Back End Schematic Diagram (8486769Z04-C) ............ 7-25
Figure 7-20. VHF (136-162 MHz) Synthesizer Schematic Diagram (8486769Z04-C)........................ 7-26
Figure 7-21. VHF (136-162 MHz) Voltage Controlled Oscillator Schematic
Diagram (8486769Z04-C) .............................................................................................. 7-27
Figure 7-22. VHF (136-162 MHz) Transmitter and Power Control Schematic
Diagram (8486769Z04-C).............................................................................................. 7-28
Figure 7-23. VHF (136-162 MHz) Controller Interconnect Schematic Diagram (8486769Z04-C) ...... 7-29
Figure 7-24. VHF (136-162 MHz) Microprocessor  Circuitry Schematic Diagram (8486769Z04-C)... 7-30
Figure 7-25. VHF (136-162 MHz) Audio Circuitry Schematic Diagram (8486769Z04-C) ................... 7-31
Figure 7-26.  VHF (136-162 MHz) DC Regulation Schematic Diagram (8486769Z04-C) .................. 7-32
Figure 7-27. VHF (136-162 MHz) Keypad Board Schematic Diagram (8466565A03-B).................... 7-33
Figure 7-28. VHF (136-162 MHz) Board Component Side View (8486769Z04-C)............................. 7-34
Figure 7-29. VHF (136-162 MHz) Board Solder Side View (8486769Z04-C) ..................................... 7-35
Figure 7-30. VHF (136-162 MHz) Keypad Board (8466565A03-B) .................................................... 7-36
VHF (136-162 MHz) Radio Parts List (8486769Z04-C)......................................................................... 7-37
VHF (136-162 MHz) Keypad Board Parts List (8466565A03-B) ........................................................... 7-40
Chapter 7 VHF 146-174 MHz (8486342Z13-C) Schematic Diagrams,
Overlays, and Parts Lists ................................................. 7-41
Figure 7-31. VHF (146-174 MHz) Radio Circuit Block Interconnect Diagram (8486342Z13-C) ......... 7-41
Figure 7-32. VHF (146-174 MHz) 8486342Z13-C Receiver Front End Schematic Diagram .............. 7-42
Figure 7-33. VHF (146-174 MHz) 8486342Z13-C Receiver Back End Schematic Diagram .............. 7-43
Figure 7-34. VHF (146-174 MHz) 8486342Z13-C Synthesizer Schematic Diagram .......................... 7-44
Figure 7-35. VHF (146-174 MHz) 8486342Z13-C Voltage Controlled Oscillator Schematic 
Diagram .......................................................................................................................... 7-45
Figure 7-36. VHF (146-174 MHz) 8486342Z13-C Transmitter and Power Control Schematic Diagram 7-
46
Figure 7-37. VHF (146-174 MHz) 8486342Z13-C Controller Interconnect Schematic Diagram ........ 7-47
Figure 7-38. VHF (146-174 MHz) 8486342Z13-C Microprocessor Circuitry Schematic Diagram ...... 7-48
Figure 7-39. VHF (146-174 MHz) 8486342Z13-C Audio Circuitry Schematic Diagram ..................... 7-49
Figure 7-40. VHF (146-174 MHz) 8486342Z13-C DC Regulation Schematic Diagram ..................... 7-50
Figure 7-41. VHF (146-174 MHz) Keypad Board Schematic Diagram (8466565A03-B).................... 7-51
Figure 7-42. VHF (146-174 MHz) 8486342Z13-C Board Component Side ........................................ 7-52
Figure 7-43. VHF (146-174 MHz) 8486342Z13-C Board Solder Side View ....................................... 7-53
Figure 7-44. VHF (146-174 MHz) (8466565A03-B) Keypad Board .................................................... 7-54 
						

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VHF (146-174 MHz) 8486342Z13-C Radio Parts List ........................................................................... 7-55
VHF (146-174 MHz) Keypad Board Parts List  (8466565A03-B) .......................................................... 7-58
Chapter 7 VHF 146-174 MHz Schematic Diagrams, Overlays, 
and Parts Lists (8486769Z04-C) ....................................... 7-59
Figure 7-45. VHF (146-174 MHz) Radio Circuit Block Interconnect Diagram (8486769Z04-C) ......... 7-59
Figure 7-46. VHF (146-174 MHz) Receiver Front End Schematic Diagram (8486769Z04-C)............ 7-60
Figure 7-47. VHF (146-174 MHz) Receiver Back End Schematic Diagram (8486769Z04-C) ............ 7-61
Figure 7-48. VHF (146-174 MHz) Synthesizer Schematic Diagram (8486769Z04-C) ........................ 7-62
Figure 7-49. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486769Z04-C)............................................................................................... 7-63
Figure 7-50. VHF (146-174 MHz) Transmitter and Power Control Schematic 
Diagram (8486769Z04-C)............................................................................................... 7-64
Figure 7-51. VHF (146-174 MHz) Controller Interconnect Schematic Diagram (8486769Z04-C) ...... 7-65
Figure 7-52. VHF (146-174 MHz) Microprocessor  Circuitry Schematic Diagram (8486769Z04-C) ... 7-66
Figure 7-53. VHF (146-174 MHz) Audio Circuitry Schematic Diagram (8486769Z04-C) ................... 7-67
Figure 7-54. VHF (146-174 MHz) DC Regulation Schematic Diagram (8486769Z04-C) ................... 7-68
Figure 7-55. VHF (146-174 MHz) Keypad Board Schematic Diagram (8466565A03-B) .................... 7-69
Figure 7-56. VHF (146-174 MHz) Board Component Side View (8486769Z04-C) ............................. 7-70
Figure 7-57. VHF (146-174 MHz) Board Solder Side View (8486769Z04-C) ..................................... 7-71
Figure 7-58. VHF (146-174 MHz) Keypad Board (8466565A03-B) .................................................... 7-72
VHF (146-174 MHz) Radio Parts List (8486769Z04-C) ......................................................................... 7-73
VHF (146-174 MHz) Keypad Board Parts List (8466565A03-B) ........................................................... 7-76
Chapter 8 403-440 MHz UHF Theory Of Operation............................ 8-1
8.1 Introduction .................................................................................................................................... 8-1
8.2 UHF Receiver ................................................................................................................................ 8-1
8.2.1 Receiver Front End ........................................................................................................... 8-1
8.2.2 Receiver Back End ........................................................................................................... 8-2
8.3 UHF Transmitter ............................................................................................................................ 8-3
8.3.1 Transmitter Power Amplifier.............................................................................................. 8-3
8.3.2 Antenna Switch ................................................................................................................. 8-3
8.3.3 Harmonic Filter.................................................................................................................. 8-3
8.3.4 Antenna Matching Network ............................................................................................... 8-4
8.3.5 Power Control ................................................................................................................... 8-4
8.4 UHF Frequency Generation Circuitry............................................................................................. 8-4
8.4.1 Fractional-N Synthesizer...................................................................................................8-5
8.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 8-6
8.5 Keypad ........................................................................................................................................... 8-7
Chapter 9 438-470 MHz UHF Theory Of Operation............................ 9-1
9.1 Introduction .................................................................................................................................... 9-1
9.2 UHF Receiver ................................................................................................................................ 9-1
9.2.1 Receiver Front End ........................................................................................................... 9-1
9.2.2 Receiver Back End ........................................................................................................... 9-2
9.3 UHF Transmitter ............................................................................................................................ 9-3
9.3.1 Transmitter Power Amplifier.............................................................................................. 9-3
9.3.2 Antenna Switch ................................................................................................................. 9-3
9.3.3 Harmonic Filter.................................................................................................................. 9-3 
						

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9.3.4 Antenna Matching Network............................................................................................... 9-4
9.3.5 Power Control ................................................................................................................... 9-4
9.4 UHF Frequency Generation Circuitry ............................................................................................ 9-4
9.4.1 Fractional-N Synthesizer ..................................................................................................9-5
9.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 9-6
9.5 Keypad........................................................................................................................................... 9-7
Chapter 10 465-495 MHz UHF Theory Of Operation.......................... 10-1
10.1 Introduction .................................................................................................................................. 10-1
10.2 UHF Receiver .............................................................................................................................. 10-1
10.2.1 Receiver Front End ......................................................................................................... 10-1
10.2.2 Receiver Back End .........................................................................................................10-2
10.3 UHF Transmitter .......................................................................................................................... 10-3
10.3.1 Transmitter Power Amplifier ........................................................................................... 10-3
10.3.2 Antenna Switch ............................................................................................................... 10-3
10.3.3 Harmonic Filter ............................................................................................................... 10-3
10.3.4 Antenna Matching Network............................................................................................. 10-4
10.3.5 Power Control ................................................................................................................. 10-4
10.4 UHF Frequency Generation Circuitry ..........................................................................................10-4
10.4.1 Fractional-N Synthesizer ................................................................................................ 10-5
10.4.2 Voltage Controlled Oscillator (VCO) ............................................................................... 10-6
10.5 Keypad......................................................................................................................................... 10-7
Chapter 11 490-527 MHz UHF Theory Of Operation.......................... 11-1
11.1 Introduction .................................................................................................................................. 11-1
11.2 UHF Receiver .............................................................................................................................. 11-1
11.2.1 Receiver Front End ......................................................................................................... 11-1
11.2.2 Receiver Back End .........................................................................................................11-2
11.3 UHF Transmitter .......................................................................................................................... 11-3
11.3.1 Transmitter Power Amplifier ........................................................................................... 11-3
11.3.2 Antenna Switch ............................................................................................................... 11-3
11.3.3 Harmonic Filter ............................................................................................................... 11-3
11.3.4 Antenna Matching Network............................................................................................. 11-4
11.3.5 Power Control ................................................................................................................. 11-4
11.4 UHF Frequency Generation Circuitry ..........................................................................................11-4
11.4.1 Fractional-N Synthesizer ................................................................................................ 11-5
11.4.2 Voltage Controlled Oscillator (VCO) ............................................................................... 11-6
11.5 Keypad......................................................................................................................................... 11-7
Chapter 12 UHF Troubleshooting Tables ........................................... 12-1
12.1 Troubleshooting Table for Receiver............................................................................................. 12-1
12.2 Troubleshooting Table for Synthesizer ........................................................................................ 12-3
12.3 Troubleshooting Table for Transmitter......................................................................................... 12-4
12.4 Troubleshooting Table for Board and IC Signals ......................................................................... 12-6
Chapter 13 UHF Schematic Diagrams, Overlays, and Parts Lists ... 13-1
13.1 Introduction .................................................................................................................................. 13-1
13.1.1 Notes For All Schematics and Circuit Boards................................................................. 13-1 
						

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13.1.2 Six Layer Circuit Board ...................................................................................................13-3
13.2 Speaker and Microphone Schematic ...........................................................................................13-3
13.2.1 Speaker and Microphone Parts List ................................................................................ 13-3
Chapter 13 UHF 403-440 MHz 8486635Z03-O Schematic Diagrams,
Overlays, and Parts Lists ................................................. 13-5
Figure 13-3. UHF (403-440 MHz) 8486635Z03-O Radio Circuit Block Diagram ................................ 13-5
Figure 13-4. UHF (403-440 MHz) 8486635Z03-O Receiver Front End Schematic Diagram.............. 13-6
Figure 13-5. UHF (403-440 MHz) 8486635Z03-O Receiver Back End Schematic Diagram .............. 13-7
Figure 13-6. UHF (403-440 MHz) 8486635Z03-O Synthesizer Schematic Diagram .......................... 13-8
Figure 13-7. UHF (403-440 MHz) 8486635Z03-O Voltage Controlled Oscillator Schematic Diagram13-9
Figure 13-8. UHF (403-440 MHz) 8486635Z03-O Transmitter and Power Control 
Schematic Diagram ...................................................................................................... 13-10
Figure 13-9. UHF (403-440 MHz) 8486635Z03-O Controller Interconnect Schematic Diagram ...... 13-11
Figure 13-10. UHF (403-440 MHz) 8486635Z03-O Microprocessor Circuitry Schematic Diagram .... 13-12
Figure 13-11. UHF (403-440MHz) 8486635Z03-O Audio Circuitry Schematic Diagram .................... 13-13
Figure 13-12. UHF (403-440 MHz) 8486635Z03-O DC Regulation Schematic Diagram ................... 13-14
Figure 13-13. UHF (403-440 MHz) Keypad Board Schematic Diagram (8466565A03-B).................. 13-15
Figure 13-14. UHF (403-440 MHz) 8486635Z03-O Board Component Side View ............................. 13-16
Figure 13-15. UHF (403-440 MHz) 8486635Z03-O Board Solder Side View ..................................... 13-17
Figure 13-16. UHF (403-440 MHz) (8466565A03-B) Keypad Board .................................................. 13-18
UHF (403-440 MHz) 8486635Z03-O Radio Parts List ......................................................................... 13-19
UHF (403-440 MHz) Keypad Board Parts List  (8466565A03-B) ........................................................ 13-22
Chapter 13 UHF 438-470 MHz 84863848Z13-C Schematic Diagrams,
Overlays, and Parts Lists ............................................... 13-23
Figure 13-17. UHF (438-470 MHz) 8486348Z13-C Radio Circuit Block Diagram .............................. 13-23
Figure 13-18. UHF (438-470 MHz) 8486348Z13-C Receiver Front End Schematic Diagram ............ 13-24
Figure 13-19. UHF (438-470 MHz) 8486348Z13-C Receiver Back End Schematic Diagram ............ 13-25
Figure 13-20. UHF (438-470 MHz) 8486348Z13-C Synthesizer Schematic Diagram ........................ 13-26
Figure 13-21. UHF (438-470 MHz) 8486348Z13-C Voltage Controlled Oscillator Schematic 
Diagram ........................................................................................................................13-27
Figure 13-22. UHF (438-470 MHz) 8486348Z13-C Transmitter and Power Control Schematic 
Diagram ........................................................................................................................13-28
Figure 13-23. UHF (438-470 MHz) 8486348Z13-C Controller Interconnect Schematic Diagram ...... 13-29
Figure 13-24. UHF (438-470 MHz) 8486348Z13-C Microprocessor  Circuitry Schematic Diagram ... 13-30
Figure 13-25. UHF (438-470 MHz) 8486348Z13-C Audio Circuitry Schematic Diagram ................... 13-31
Figure 13-26. UHF (438-470 MHz) 8486348Z13-C DC Regulation Schematic Diagram ................... 13-32
Figure 13-27. UHF (438-470 MHz) Keypad Option Schematic Diagram (8466565A03-B)................. 13-33
Figure 13-28. UHF (438-470 MHz) 8486348Z13-C Board Component Side View ............................. 13-34
Figure 13-29. UHF (438-470 MHz) 8486348Z13-C Board Solder Side View ..................................... 13-35
Figure 13-30. UHF (438-470 MHz) Keypad Board (8466565A03-B) .................................................. 13-36
UHF (438-470 MHz) PCB 8486348Z13-C Radio Parts List................................................................. 13-37
UHF (438-470 MHz) Keypad Board Parts List (8466565A03-B) ......................................................... 13-40