Motorola Cm Radio Controlheads Manual

Controlhead Model for CM160 and CM3602-5
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,...

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 Controlhead CM140/CM340 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,...

Controlhead CM140/CM340 Troubleshooting Chart 3-3
1.3 Button/Tones Select Error (Page 2 of 2)
Key_Col
Vo l t a g e
(TP401)Key_Column Voltage TP401
0.008 V0.675 V1.346 V1.997 V2.650 V3.300 V
0.008 VUp
0.675 V 1 2 3
1.346 V  4 5 6 7
1.997 V 8 9 0 *
2.650 V # C B A
3.300 V
DownLeft Key
P1Right Key
P2Idle
Key_Row Voltage TP402
NoRight
Voltage
on DTMF keys
?
Replace
Q812
YES
Button/Tones Keys
Okay
A
Does Q812
on Control Head
operates well
?
Replace U803
on Control Head
YESNo 

3-4TROUBLESHOOTING CHARTS
2.0 Controlhead CM160/CM360 Troubleshooting Chart
2.1 Control Head Failure
Back light
OK ?Check 9.3V on 
Q12, U1 and associated
parts and U8No
Control Head Check
Power-up
Alert Tone
OK ?Check Speaker
ConnectionNo
Indicator
LED’
S
OK ?
Check 
Q8-Q10, U8 and 9.3VNo
Display
OK?Check LCD
connections, U3 for 5V, 
Osc. pins 1 & 2 activity
SCI thru via U4 No
Up/Down
P1 and P2
Alert Tone
Buttons 
OK?
Check keypad resistorsNo
EXT
PTT
OK ?
Check Q13, Q802No
Communication OkCheck Q803, Q14...

Controlhead CM160/CM360 Troubleshooting Chart 3-5
2.2 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 R13, R45
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 R12, R49 
on Control Head
Right
Voltage
on P1-P4
Keys ?
Is there
0.75 Vdc on
MIC_SENSE
R429,...

3-6TROUBLESHOOTING CHARTS
2.3 Button/Tones Select Error (Page 2 of 2)
Key_Col
Vo l t a g e
(TP401)Key_Column Voltage TP401
0.008 V0.675 V1.346 V1.997 V2.650 V3.300 V
0.008 VUp
0.675 V 1 2 3
1.346 V  4 5 6 7
1.997 V 8 9 0 *
2.650 V # C B A
3.300 V
DownLeft Key
P1Right Key
P2P3 P4 Idle
Key_Row Voltage TP402
NoRight
Voltage
on DTMF keys
?
Replace
Q41
YES
Button/Tones Keys
Okay
A
Does Q41
on Control Head
operates well
?
Replace U8
on Control Head
YESNo 

Chapter 4
CONTROLHEAD PCB / SCHEMATICS / PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards
Ta b l e 4 - 1Controlhead Diagrams and Parts Lists
PCB :
Controlhead CM140/CM340
8488998U01Main Board Top Side
8488998U01Main Board Bottom SidePage 4-3
Page 4-3
SCHEMATICS
Sheet 1 of 1
Page 4-4
Parts List
8488998U01Page 4-5
Ta b l e 4 - 2Controlhead Diagrams and Parts Lists
PCB :
Controlhead CM160/CM360
8489714U01Main Board Top Side
8489714U01Main Board Bottom SidePage 4-6
Page 4-6
SCHEMATICS
Sheet 1 of...

4-2 CONTROLHEAD PCB / SCHEMATICS / PARTS LISTS
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