Motorola Radio Mcs2000 Vol 1 68p81083c20 A Manual

							 
MCS 2000 Mobile Radio 
Service Instructions
Volume 1
Non-Frequency Range SpeciÞc 
68P81083C20-A,  Issued: 02.97. 
						

							 
ii 
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 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 or 
reproduced 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 royalty free license to use that arises by 
operation of law in the sale of a product. 
Notes, Cautions, Warnings, Danger 
Throughout this guide, you will notice the use of 
NOTES, CAUTIONS, WARNINGS, and DANGERS. Their 
use is explained below.  
NOTE: A clarifying statement that 
expands on the text that follows.
CAUTION indicates a potentially 
hazardous situation which, if not 
avoided, may result in equipment 
damage.
WARNING indicates a potentially 
hazardous situation which, if not 
avoided, could result in death or injury.  
DANGER indicates an imminently 
hazardous situation which, if not avoided, 
will result in death or serious injury. 
Safety Information 
Every radio, when transmitting, radiates 
energy into the atmosphere which may, 
under certain conditions, cause the 
generation of a spark. All users of vehicles 
Þtted with radios should be aware of the 
following warnings (see also ÒImportant 
Electromagnetic Emission InformationÓ 
below).  
¥  
Do not   
operate radio near ßammable liquids or in 
the vicinity of explosive devices.
During normal use, the radio will subject you to radio 
energy substantially below the level where any kind of 
harm is reported. To ensure personal safety, please 
observe the following simple rules:
¥  
Do not   
transmit when the antenna is very close to, 
or touching, exposed parts of the body, especially the 
face and eyes.
¥  
Do not   
hold the transmit (PTT) key in when not 
desiring to transmit.
¥  
Check  
 the laws and regulations on the use of two-
way mobile radios in the areas where you drive. 
Always obey them. Also, when using your phone 
while driving, please:
-give full attention to driving,
-use hands-free operation, if available, and
-pull off the road and park before making or 
answering a call if driving conditions so require. 
Airbag Warning 
An air bag inßates with great force.   
Do not   
place objects, including 
communication equipment, in the area 
over the air bag or in the air bag 
deployment area. If the communication 
equipment is improperly installed and 
the air bag inßates, this could cause 
serious injury.  
Installation of vehicle communication equipment 
should be performed by a professional installer/
technician qualiÞed in the requirements for such 
installations. 
An air bagÕs size, shape and deployment area can vary by 
vehicle make, model and front compartment 
conÞguration (e.g., bench seat vs. bucket seats). Contact 
the vehicle manufacturerÕs corporate headquarters, if 
necessary, for speciÞc air bag information for the vehicle 
make, model and front compartment conÞguration 
involved in your communication equipment 
installation.
Note
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iii 
Operational Safety Warnings 
For vehicles equipped with Electronic 
Ignition Systems, check the vehicle 
service manual for warnings about the 
use of two-way radio equipment in the 
vehicle.  
The radio may switch into transmit mode, immediately 
upon being connected to power, if an open circuit exists 
between pins 4 and 9 of the Accessory Connector. To 
avoid personal injury and/or damage to the radio, 
ensure that a jumper wire or an emergency switch that 
has normally closed contacts is connected between pins 
4 and 9 of the accessory connector before the radio is 
connected to vehicle battery power or any other power 
supply. 
Radio Care / Handling Cautions 
¥Avoid physical abuse; do not pound, drop, or throw 
the radio. It may damage exposed parts such as 
controls and connectors.
¥Do not connect accessories other than Motorola 
compatible equipment, as it may damage the radio. 
For a list of available compatible accessories consult 
the Mobius Accessories Guide part number 
68P02058U52, or the MCS 2000 Accessories Guide 
part number 68P81080C47, or check with your local 
Motorola representative.
¥The use of a Mini UHF Adaptor can damage the RF 
Antenna Connector and lead to radio failure, and is 
grounds for voiding warranty.
¥Operating the radio without an antenna cable 
attached may lead to radio failure and is grounds for 
voiding warranty. 
Important Electromagnetic 
Emission Information 
In August, 1996, The Federal Communications 
Commission (FCC) adopted an updated safety standard 
for human exposure to radio frequency electromagnetic 
energy emitted by FCC regulated equipment. Motorola 
subscribes to this same updated safety standard for the 
use of its products.
In keeping with sound installation practice and to 
maximize radiation efÞciency, a one-quarter (1/4) wave 
length antenna should be installed at the center of the 
vehicle roof. If it is necessary to mount the antenna on 
the vehicles trunk lid, an appropriate 3db gain antenna 
should be used. This installation procedure will assure 
that  vehicle occupants will be exposed to radio 
frequency energy levels lower than the limits speciÞed in 
the standard adopted by the FCC in General Docket 
79144.
To assure that radio frequency (RF) energy exposure to 
bystanders external to a vehicle is lower than that 
recommended by FCC adopted standard, transmit with 
any mobile radio only when bystanders are at least two 
(2) feet/60 cm away from a properly installed externally 
mounted antenna for radios with less than 50 watts of 
output power, or three (3) feet/90 cm away for radios 
with 50 watts or greater power. 
Control Station Operation 
In the event of Control Station operation, to assure 
operators and bystanders are exposed to radio frequency 
(RF) energy levels lower than the limits speciÞed in the 
FCC adopted standard, the antenna should be installed 
outside of any building, but in no instance shall the 
antenna be within two feet/60 cm (less than 50 watts 
power output) or within three feet/90 cm (50 watts or 
higher power output) of station operators or bystanders. 
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iv 
LP Gas Warning 
It is mandatory that radios installed in 
vehicles fuelled by liqueÞed petroleum 
gas conform to the National Fire 
Protection Association standard NFPA 58, 
which applies to vehicles with a liquid 
propane (LP) gas container in the trunk or 
other sealed off space within the interior 
of the vehicle. The NFPA58 requires the 
following: 
¥Any space containing radio equipment shall be 
isolated by a seal from the space in which the LP gas 
container and its Þttings are located.
¥Removable (outside) Þlling connections shall be 
used.
¥The container space shall be vented to the outside. 
Anti-Lock Braking System (ABS) 
and Anti-Skid Braking System 
Precautions 
Disruption of the anti-skid/anti-lock 
braking system by the radio transmitter 
may result in unexpected vehicle motion. 
Motorola recommends the following radio installation 
precautions and vehicle braking system test procedures 
to ensure that the radio, when transmitting, does not 
interfere with operation of the vehicle braking system. 
Installation Precautions 
Always provide as much distance as possible between 
braking modulator unit and radio, and between braking 
modulator unit and radio antenna and associated 
antenna transmission line. Before installing radio, 
determine location of braking modulator unit in vehicle. 
Depending on make and model of vehicle, braking 
modulator unit may be located in trunk, under 
dashboard, in engine compartment, or in some other 
cargo area. If you cannot determine location of braking 
modulator unit, refer to vehicle service manual or 
contact a dealer for the particular make of vehicle.
If braking modulator unit is located on left side of the 
vehicle, install radio on right side of vehicle, and 
conversely. 
Route all radio wiring including antenna transmission 
line as far away as possible from braking modulator unit 
and associated braking system wiring.
Never activate radio transmitter while vehicle is in 
motion and vehicle trunk lid is open. 
Braking System Tests 
The following procedure checks for the most common 
types of interference that may be caused to vehicle 
braking system by a radio transmitter.
1.Run vehicle engine at idle speed and set vehicle 
transmission selector to PARK. Release brake pedal 
completely and key radio transmitter. Verify that 
there are no unusual effects (visual or audible) to 
vehicle lights or other electrical equipment and 
accessories while microphone is NOT being 
spoken into.
2.Repeat Step 1. except do so while microphone IS 
being spoken into.
3.Press vehicle brake pedal slightly just enough to 
light vehicle brake light(s). Then repeat Step 1. 
and Step 2.
4.Press the vehicle brake pedal Þrmly and repeat 
Step 1. and Step 2.
5.Ensure that there is a minimum of two vehicle 
lengths between front of vehicle and any object in 
vehicleÕs forward path. Then, set vehicle 
transmission selector to DRIVE. Press brake pedal 
just far enough to stop vehicle motion completely. 
Key radio transmitter. Verify that vehicle does not 
start to move while microphone is NOT being 
spoken into.
6.Repeat Step 5. except do so while microphone IS 
being spoken into.
7.Release brake pedal completely and accelerate 
vehicle to a speed between 15 and 25 miles/25 and 
40 kilometers per hour. Ensure that a minimum of 
two vehicle lengths is maintained between front of 
vehicle and any object in vehicleÕs forward path. 
Have another person key radio transmitter and 
verify that vehicle can be braked normally to a 
moderate stop while microphone is NOT being 
spoken into.
8.Repeat Step 7. except do so while microphone IS 
being spoken into.
9.Release brake pedal completely and accelerate 
vehicle to a speed of 20 miles/30 kilometers per 
hour. Ensure that a minimum of two vehicle 
lengths is maintained between front of vehicle and 
any object in vehicleÕs forward path. Have another 
person key radio transmitter and verify that 
vehicle can be braked properly to a sudden (panic) 
stop while microphone is NOT being spoken into.
10.Repeat Step 9. except do so while microphone IS 
being spoken into.
11.Repeat Step 9. and Step 10. except use a vehicle 
speed of 30 miles/50 kilometers per hour. 
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v 
Table of Contents 
1 - Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
Scope of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Related Publications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Manual Revisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Model Numbering System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
List of Models  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Kit-To-Model Structure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6  
2 - Basic Maintenance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Preventive Maintenance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Inspection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Safe Handling of CMOS Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Parts Replacement and Substitution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Rigid Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Specific . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Audio PA Component Replacement Procedure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
For High Power Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Antenna/Power Connector Replacement Procedure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
For Low, Mid, and High Power Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5  
3 - Test Equipment, Service Aids, and Tools  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1  
Recommended Test Equipment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Service Aids and Recommended Tools  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Field Programming  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Connection of Control Head Extender Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Mid Power Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
High Power Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
4 - Test Mode and Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1  
Test Mode  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Test Mode Features  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Test Mode Entry and Exit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Error Code Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Power-up Display Codes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Operational Display Codes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4  
5 - Disassembly & Reassembly and Replacement Procedures  . . . . . . . . . . . . . . . . . . . . . . . 5-1  
General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Disassembly to Transceiver Board Level Low and Mid Power Models . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Remove the Control Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Remove Front Housing  
   
R 
EMOTE 
 M 
OUNT 
 V 
ERSION 
 M 
ODELS 
 O 
NLY 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2  
Remove the Top Cover 
   
L 
OW 
 P 
OWER 
 M 
ODELS 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
M 
ID 
 P 
OWER 
 M 
ODELS 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2  
Remove the Cavity Shield 
   
L 
OW 
 P 
OWER 
 M 
ODELS 
 O 
NLY 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 
						

							 
vi 
Remove the PA Shield 
   
L 
OW 
  
AND 
 M 
ID 
 P 
OWER 
 M 
ODELS 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4  
Remove the Transceiver Board 
   
E 
XCEPT 
 800 MH 
Z 
  
AND 
 900 MH 
Z 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4  
Remove the Transceiver Board 
   
800 MH 
Z 
  
AND 
 900 MH 
Z 
 M 
ODELS 
 O 
NLY 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6  
Disassembly to Transceiver Board Level High Power Models  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Remove the Bottom Cover  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Remove the RF Shield  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Remove the PA Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Remove the PA Board  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Remove the RF Board  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Disassembly of the Control Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Remote Mount Versions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Model I  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Models II & III 
  
S 
TANDARD 
 K 
EYPAD 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11 
Models II & III 
  
K 
EYPAD 
  
WITH 
 R 
EPLACEABLE 
 P 
USH 
 B 
UTTONS 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11  
Reassembly of the Control Head  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Model I  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Models II and III  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Transceiver Reassembly Low and Mid Power Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Transceiver Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Assembly of Control Head to Transceiver 
  
D 
ASH 
 M 
OUNT 
 M 
ODELS 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
R 
EMOTE 
 M 
OUNT 
 M 
ODELS 
. . . . . . . . . . . . . . . . . . . . . . . . . . 5-15  
Transceiver Reassembly High Power Models  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Replaceable Pushbuttons Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
Models II & III 
  
K 
EYPAD 
  
WITH 
 R 
EPLACEABLE 
 P 
USHBUTTONS 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20 
6 - Radio Tuning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6-1  
General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Tuning Procedure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Reference Oscillator Alignment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Transmitter Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Transmit Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Transmit Deviation Balance (Compensation)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Transmit Deviation Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Transmit Deviation Limit Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Signaling Deviation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Squelch  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Rated Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Front-End Pre-Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10  
7 - Controller Section Theory of Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-1 
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Theory Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Voltage Regulation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Voltage Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Electronic On/Off  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Emergency 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3  
Mechanical On/Off 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4  
Ignition 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4  
Power Control 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6  
Protection features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Interfacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Microprocessor Clock Synthesizer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Serial Peripheral Interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
SB9600 Serial Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
General Purpose Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Microprocessor Operation 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12  
Normal (=Expanded) Microprocessor Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13 
						

							 
vii Bootstrap Microprocessor Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-16
Audio and Signalling Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Audio Signalling Filter IC (ASFIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Audio Ground 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17  
Transmit Audio Circuits 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17  
Transmit Signalling Circuits  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19
Receive Audio Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
Receive Signalling Circuits  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-25  
8 - Control Heads  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1  
Model I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Audio configuration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Volume Control/On-Off  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Micro-controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Xtal Oscillator  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
LCD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Mode Select  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Multiplexer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Models II and III  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Audio Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Volume Control/On-Off  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Micro-controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Xtal Oscillator  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
LCD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Rotary Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
Mode Select  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5  
9 - Troubleshooting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1  
Troubleshooting Chart 1-1, Overall Radio  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Troubleshooting Chart 1-2 (1 of 3), Failure Codes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-3
Troubleshooting Chart 1-2 (2 of 3), Failure Codes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4
Troubleshooting Chart 1-2 (3 of 3), Failure Codes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-5
Troubleshooting Chart 1-3, On/Off Circuit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6
Troubleshooting Chart 1-4, TX Audio   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7
TX Audio Routing, Simplified Schematic for Chart 1-4  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7
Troubleshooting Chart 1-5, RX Audio   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8
RX Audio Routing, Simplified Schematic for Chart 1-5  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Troubleshooting Chart 1-6, Signalling  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
Troubleshooting Chart 1-7, DC Distribution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11
Radio Voltage, Simplified Schematic For Chart 1-7  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12
Troubleshooting Chart 1-8A, Control Head Model I  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
Numbers in brackets refer to accompanying troubleshooting procedure overleaf.   . . . . . . . . . . 9-13
Control Head I Troubleshooting Procedure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-14
Troubleshooting Chart 1-8B, Control Head Models II & III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-18
Numbers in brackets refer to accompanying troubleshooting procedure overleaf  . . . . . . . . . . . 9-18
Control Heads II and III Troubleshooting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19
Troubleshooting Chart 1-9, Clock Distribution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-24
Troubleshooting Chart 1-10, SB9600 BUS RX   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-25
Troubleshooting Chart 1-11, SB9600 BUS RX   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-26
SB9600 Voltage Table for Charts 1-10 & 1-11   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-26
SB9600 BUSY, Simplified Schematic for Charts 1-10 & 1-11  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-27 
						

							 
viii 
SB9600, Simplified Schematic for Charts 1-10 & 1-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-27
Troubleshooting Chart 1-12, GPIO   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-28
Troubleshooting Chart 1-13 (1 of 2), Power Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-29
Troubleshooting Chart 1-13 (2 of 2), Power Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-30 
10 - Diagrams and Parts Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10-1  
Notes on Sheet Port Connections, Circuit Block Port Connections and Physical Connectors . . . . 10-2
Schematic Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Low Power Radios Exploded View Diagram and Parts List  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
Mid Power Radios Exploded View Diagram and Parts List   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5
High Power Radios Exploded View Diagram and Parts List   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
Control Head Model I Exploded View Diagram and Parts List  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
Control Head Model II Exploded View Diagram and Parts List   . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
Control Head Model III Exploded View Diagram and Parts List  . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
Control Head Model I Component Locations and Parts List   . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
Control Head Model I Schematic Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
Control Head Model II Component Locations and Parts List  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
Control Head Model II Schematic Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
Control Head Model III Component Locations and Parts List  . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
Control Head Model III Schematic Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
Main Controller and Audio Power Amplifier and Voltage Regulators Component Locations   . . 10-16
Controller Hierarchy Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
Main Controller Blocks Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
Controller, Microprocessor Schematic Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
Controller, Power Control Schematic Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
Controller, Audio Blocks Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21
Controller, Hear Clear Schematic Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22
Controller, ASFIC Schematic Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-23
Controller, Interface Blocks Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
Controller, IO RSSI Buffers Schematic Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25
Controller, Emergency Ignition Schematic Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-26
Controller, SCI Drivers Schematic Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-27
Controller, IO Buffers Schematic Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-28
Controller, Audio Power Amplifier and Voltage Regulators, Low and Mid Power Schematic Diagram  . 10-29
Controller, Audio Power Amplifier and Voltage Regulators, High Power Schematic Diagram   . . 10-30
Controller Parts List, Common Parts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-31
Controller Parts List, Common Parts, Continued  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-33
Controller Parts List, 800 MHz 15W Unique  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-34
Controller Parts List, 800 MHz 35W Unique  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-35
Controller Parts List, 900 MHz 12W Unique  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-36
Controller Parts List, VHF 110W Unique   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-37
Controller Parts List, UHF1 110 W Unique  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-38
Controller Parts List, Non-Common Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-39
Over Molded Pad Array Carriers (OMPACs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-40
Integrated Circuits with Pin-Out Names  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-40  
A - Glossary of Terms  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  A-1 
						

							 
ix 
List of Figures 
RF and Power Connector Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-5
Install Connector Retaining Clip  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-5
Replace PA Board   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-5
Dedicated Test Mode Keys on Models I, II and III  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4-2
Removing the Control Head   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-1
Removing the Top Cover - Low Power Models   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-2
Removing the Top Cover - Mid Power Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-3
Removing the Cavity Shield   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-3
Removing the PA Shield (Low and Mid Power Models)   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-4
Removing the Transceiver Board - Low Power Models (except 800 MHz and 900 MHz)   . . . . . .  5-4
Removing the Transceiver Board - Mid Power Models (except 800 MHz and 900 MHz)  . . . . . . .  5-5
Removing the Transceiver Board (800 MHz and 900 MHz only)   . . . . . . . . . . . . . . . . . . . . . . . . .  5-6
Direction Conventions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-7
Removing the Accessory Connector  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-7
Removing the Bottom Cover  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-8
Removing the RF Shield   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-8
Removing the PA Shield  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-9
Removing the PA Board   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-9
Removing the RF Board   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-10
Reassembly   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-14
Wakefield / Thermal Compound Application Area  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-16
Inserting Transceiver Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-16
Reassembly Screw Down Sequence   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-17
Inserting Audio PA Clip   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-18
Installing Cover Gasket  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-19
Model I Replaceable Pushbuttons  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-20
Model II Replaceable Pushbuttons   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-20
Model III Replaceable Pushbuttons  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-20
Grasping Pushbutton with Flat End Pliers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
Pulling Pushbutton Away from Control Head  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5-22
Radio Alignment Test Setup   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6-1
Service Menu Structure for RVN4113   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Softpot Concept  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6-3
Clock Distribution Block Diagram   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-10
Transmit Audio Paths   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-18
Transmit Signalling Paths   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-20
Receive Audio Paths   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-22
Receive Signalling Paths  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-25
Troubleshooting Charts Overview  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9-1
Schematic Diagram Hierarchy  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10-2
Example of Transceiver Board Block Connection Diagram (110 Watt Radio)   . . . . . . . . . . . . . .  10-3 
						

							 
x 
List of Tables 
Kit-to-Model Structure for VHF and UHF Radios  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Kit-to-Model Structure for 800 and 900 MHz Radios   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Recommended Test Equipment   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Service Aids   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Recommended Service Tools   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Control Head Connector Pin Signals   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Power Up Display Codes   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Operational Display Codes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Replaceable Pushbutton Graphics and Part Numbers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
Reference Oscillator Alignment   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Transmit Power Setting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Current Limit Step Adjustment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Signaling Deviation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Conventional/MDC/SmartNet/SmartZone Ignition Sense Function - 
 . . . . . . . . . . .  Operator Action vs Resultant Radio States  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Secondary I/O Functions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Hear Clear Enable Lines Configuration   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-26