Motorola Cm Radio Maintainability Manual

Warranty and Service Support1-3
2.6 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 of the manual describes:

preventive maintenance

safe handling of CMOS devices

repair procedures and techniques
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 radio are clean, and that all external controls and switches 
are functional. It is not recommended to inspect the interior...

2-2MAINTENANCE
3.0 Safe Handling of CMOS and LDMOS
Complementary metal-oxide semiconductor (CMOS) devices are used in this family of radios. 
CMOS characteristics make them susceptible to damage by electrostatic or high voltage 
charges. Damage can be latent, resulting in failures occurring weeks or months later. Therefore, 
special precautions must be taken to prevent device damage during disassembly, 
troubleshooting, and repair. 
Handling precautions are mandatory for CMOS circuits and are especially...

General Repair Procedures and Techniques2-3
Chip Components
Use either the RLN4062 Hot-Air Repair Station or the Motorola 0180381B45 Repair Station for 
chip component replacement. When using the 0180381B45 Repair Station, select the TJ-65 mini-
thermojet hand piece. On either unit, adjust the temperature control to 370 °C (700 °F), and 
adjust the airflow to a minimum setting. Airflow can vary due to component density.

To remove a chip component: 
1.Use a hot-air hand piece and position the nozzle of...

2-4MAINTENANCE
Shields
Removing and replacing shields will be done with the R1070 station with the temperature control 
set to approximately 215°C (415°F) [230°C (445°F) maximum].

To r e m o v e t h e s h i e l d: 
1.Place the circuit board in the R1070 circuit board holder. 
2.Select the proper heat focus head and attach it to the heater chimney. 
3.Add solder paste flux around the base of the shield. 
4.Position the shield under the heat-focus head. 
5.Lower the vacuum tip and attach it to the shield...

Notes For All Schematics and Circuit Boards2-5
5.0 Notes For All Schematics and Circuit Boards
* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.
1.Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads 
(pF) or microfarads (µF).
2.DC voltages are measured from point indicated to chassis ground using a Motorola DC 
multimeter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in 
series with the...

2-6MAINTENANCE
MIC_PTT_CH Microphone PTT Input
MOD_IN Modulation Signal from ASFIC
MOD_OUT Modulation Signal to the Synthesizer
ONOFF_SENSE On off sense switch
OPT_DATA_R_OPRD DATA/Ready Request from Option Board
OPT_EN_OPBD Option Board Chip Select
PA_BIAS PA Control bias voltage
PA_CURRENT Not used
POST_LIMITER_TX 
AUDIO_RETURN_OPT_BRDFlat TX Input from Option Board
PROG x IN ACC y General Purpose Input x accessory connector Pin y
PROG x INOUT ACC y General Purpose Input/Output x accessory connector...

Notes For All Schematics and Circuit Boards2-7
VS AUDIO_SEL Switch signal to Enable option board audio output signal
VS GAIN_SEL Voice Storage Gain Select line
VS_MIC Voice Storage Audio Signal to microphone path
VS_INT Voice Storage Interrupt line
VS_RAC Voice storage Row Address Clock Signal
VSTBY 3.3 V supply for µP when the radio is switched off 

2-8MAINTENANCE