Motorola Cm Radio Basic Manual

Warranty and Service Support1-3
2.5 Technical Support
Motorola Product Services is available to assist the dealer/distributors in resolving any malfunctions 
which may be encountered.
UK/Ireland - Richard Russell
Telephone:  +44 (0) 1256 488 082
Fax:  +44 01256 488 080
Email:  [email protected]
Central/East Europe- Siggy Punzenberger
Telephone:  +49 (0) 6128 70 2342
Fax:  +49 (0) 6128 95 1096
Email:  [email protected]
Scandinavia
Telephone:  +46 8 735 9282
Fax:  +46 8 735 9280
Email:...

1-4INTRODUCTION
3.0 Radio Model Information
The model number and serial number are located on a label attached to the back of your radio. You 
can determine the RF output power, frequency band, protocols, and physical packages. The 
example below shows one mobile radio model number and its specific characteristics.
Ta b l e 1 - 1Radio Model Number (Example: MDM50FNC9AN2_N)
Type of
UnitModel
SeriesFreq.
BandPower
LevelPhysical
PackagesChannel
SpacingProtocolFeature
LevelModel
RevisionModel
Package
MD M 50...

Chapter 2
MAINTENANCE
1.0 Introduction
This chapter provides details about the following:
❑Preventive maintenance (inspection and cleaning).
❑Safe handling of CMOS and LDMOS devices.
❑Disassembly and reassembly of the radio.
❑Repair procedures and techniques.
❑Installation of Option Boards.
2.0 Preventive Maintenance
The radios do not require a scheduled preventive maintenance program; however, periodic visual 
inspection and cleaning is recommended.
2.1 Inspection
Check that the external surfaces of the...

2-2MAINTENANCE
Cleaning Internal Circuit Boards and Components
Isopropyl alcohol (100%) may be applied with a stiff, non-metallic, short-bristled brush to dislodge 
embedded or caked materials located in hard-to-reach areas. The brush stroke should direct the 
dislodged material out and away from the inside of the radio. Make sure that controls are not soaked 
with alcohol. Do not use high-pressure air to hasten the drying process since this could cause the 
liquid to collect in unwanted places. After...

Repair Procedures and Techniques — General 2-3
4.0 Repair Procedures and Techniques — General
Parts Replacement and Substitution
When damaged parts are replaced, identical parts should be used. If the identical replacement part 
is not locally available, check the parts list for the proper Motorola part number and order the part 
from the nearest Motorola Parts centre listed in the “Piece Parts” section in Chapter 1 of this manual.
Rigid Circuit Boards
This family of radios uses bonded, multi-layer,...

2-4MAINTENANCE
6.0 Radio Disassembly - Detailed
The procedure to remove and replace a Control Head, Top Cover or Transceiver Board is similar for 
all models of radio. A typical procedure is therefore shown followed by specific disassembly 
procedures for Control Heads on radio models without a display and radio models fitted with a 
display.
6.1 Control Head Removal
Volume Knob Removal
1. Insert the flat screwdriver between the control head plastic and the volume knob and push the 
volume knob upwards....

Radio Disassembly - Detailed2-5
Figure 2-2Control Head Removal
3. To free the head, disconnect the flat cable from the chassis assembly See Figure 2-3.
Figure 2-3Flat Cable Removal 

2-6MAINTENANCE
6.2 Top Cover Removal
1. Place the radio in a vertical position as shown in Figure 2-4..
Figure 2-4Top Cover Removal (Chassis Vertical).
2. Insert the flat screw driver near the ‘T’ and push the plastic cover up until it pops over the ‘T’ 
mount boss. Perform the same function on the ‘T’ location on the other side of the chassis.
3. Next place the radio in a horizontal position as shown in Figure 2-5 and insert the flat screw 
driver into the slot to release the upper cover.
Figure 2-5Top...

Radio Disassembly - Detailed2-7
6.3 Main Shield Removal
1. Insert the screw driver in the gap between the main shield and chassis (speaker cutout area) 
and push the shield up. See Figure 2-6.
2. Lift the cover from the chassis.
Figure 2-6Main Shield Removal
6.4 PA Shield and DC Cable Removal
1. Remove the three screws that attach the PA shield to PCB, and remove the PA shield.
2. Remove the accessory Connector cap.
3. Remove the two screws that attach the DC power cable to the PCB and pull it out from...

2-8MAINTENANCE
6.5 PAClipandMainPCBRemoval
1. Remove the screw that attaches the PA clip to the chassis. See Figure 2-8.
2. Remove the PA clip.
3. Remove all the screws that fix the PCB to the chassis.
4. Loosen the M1.6 screw (about 3 to 4 turns) on the RF connector.
5. Loosening this screw, enables you to unscrew the RF connector from outside.
6. Carefully remove the main PCB in a diagonal manner.
Figure 2-8PA Clip and Main PCB Removal
NOTEIt is recommended to grip the volume potentiometer and remove...