Motorola Radius Cm200 Cm300 Pm400 Detailed 6881098c00 A Manual

Chapter 1
OVERVIEW
1.0 CM200 Model
The control head contains the internal speaker, the on/off/volume knob, the microphone connector, 
several buttons to operate the radio, three indicator Light Emitting Diodes (LED) to inform the user 
about the radio status, and a single character 7-segment display for numeric information e.g. 
channel number.
2.0 CM300/PM400 Models 
The control head contains the internal speaker, the on/off/volume knob, the microphone connector, 
several buttons to operate the radio,...

1-2OVERVIEW
Notes 

Chapter 2
THEORY OF OPERATION
1.0 Introduction
This Chapter provides a detailed theory of operation for the Control head circuits. For details of the 
trouble shooting refer to the related chapter in this section.
2.0 Control Head Model for CM200
The head contains the internal speaker, the on/off/volume knob, the microphone connector, several 
buttons to operate the radio and three indicator Light Emitting Diodes (LED) to inform the user about 
the radio status and a 7-segment display for numeric...

2-2THEORY OF OPERATION
When the host radio needs to send date to the shift register, the radio asserts the shift register chip 
select and the data is loaded to the shift register. For example, the host radio sends data to change 
display channel or change LED status.
2.3 Keypad Keys
The  head keypad is a four-key design. All keys are configured as two analog lines read by µP. The 
voltage on the analog lines varies between 0V and 3.3 V depending on which key is pressed. If no 
key is pressed, the...

Control Head Model for CM2002-3
If the BOOT_RES (J802-7) line is connected to >5V (e.g. 9.3V) at turn-on, the uP will start in boot 
mode instead of normal operation. This mode is used to programme new firmware into the FLASH 
memory (U404 mainboard). 
2.6 Speaker
The head contains a speaker for the receiver audio. The receiver audio signal from the differential 
audio output of the audio amplifier located on the radio’s ler is fed via connector J803-1, 2 to the 
speaker connector P801 pin 1 and pin 2....

2-4THEORY OF OPERATION
3.0 Control Head Model for CM300/PM400
The control head contains the internal speaker, the on/off/volume knob, the microphone connector, 
several buttons to operate the radio, three indicator Light Emitting Diodes (LED) to inform the user 
about the radio status, and an 8 character Liquid Crystal Display (LCD) for alpha - numerical 
information e.g. channel number or call address name. 
3.1 Power Supplies
The power supply to the control head is taken from the host radio’s 9.3V via...

Control Head Model for CM300/PM4002-5
3.3 Keypad Keys
The control head keypad is a four-key design. All keys are configured as two analog lines read by 
µP. The voltage on the analog lines varies between 0V and 3.3 V depending on which key is 
pressed. If no key is pressed, the voltage at both lines is 3.3V. The key configuration can be thought 
of as a matrix where the two lines represent one row and one column. Each line is connected to a 
resistive divider powered by 3.3V. If a button is pressed, it...

2-6THEORY OF OPERATION
The HOOK line (J102-6) is used to inform the uP which type of microphone or SCI lead is connected 
to the microphone socket. The voltage of the HOOK line is monitored by the uP (port PE0, 
MIC_SENSE) through a resistor divider on the main board. When the HOOK line is grounded (on 
hook condition) or floating (2.8V nominal), the uP sets the mux (U8) for keypad operation to allow the 
use of microphones with a keypad. When the HOOK line is connected to 9.3V, the uP sets the mux 
for...

Chapter 3
TROUBLESHOOTING CHARTS
1.0 Control Head CM200 Troubleshooting Chart
1.1 Control Head Failure
Back light
OK ?Check 9.3V on 
R808, R809No
Control Head Check
Power-up
Alert Tone
OK ?Check Speaker
ConnectionNo
Power-up
Red LED
Flash?Check 
D801, Q806, U801No
Channel
Display
OK?Check
DS801, U801, U802No
Up/Down
P1 and P2
Alert Tone
Buttons OK?
Check R845, R846
R810, R811No
EXT
PTT
OK ?
Check Q801, Q802No
Communication OkCheck Q803, Q812
Control Head is OK
YES
YES
YES
YES
YES
YES
No 

3-2TROUBLESHOOTING CHARTS
1.2 Button/Tones Select Error (Page 1 of 2)
No
Check Voltage Levels on
TP401 (Keypad Col)
and TP402 (Keypad Row)
(see table on next page)
Right
Voltage
Up Key
No
Check R846, R811
on Control Head
Right
Voltage
on Down Key
?
Check Control Head
connectivity continuity 
and R429, R430, D401
(main board)
Connect DTMF Mic
to TELCO Connector
YES
Button/Tones Check
Check R845, R810
on Control Head
Right
Voltage
on P1/P2
Keys ?
Is there
0.75 Vdc on
MIC_SENSE
R429, on radio
Check R813,...