Motorola Cleartone CM5000 Basic Service Manual page 38

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Display
The display is 2.8 inch STN type 240RGB x 160 dots matrix color LCD module (DD001).
The control signal from the Panel CPU is connected to the LCD unit via the LCD interface connector
(J102).
The LCD is back lighted by the internal back light white LED in the LCD module. Intensity of the LCD
back light is controlled by the output voltage of the back light power supply (IC106) by the output
voltage of the DAC of the CPU.
Back light signal is connected to the LCD unit via the back light connector (J101).
Indicator LED
2 colors LED indicator (CD102) indicates the status of the radio. The panel CPU controls the LED as
red, green or amber via the transistor (TR101 and TR102)
Connector
Microphone is connected to the Key/Display unit via the RJ-45 type connector (J005).
Microphone signal, hook signal, receive signal and function key signal for handset are connected to
the microphone connector.
Audio Circuit
The microphone signal fed to the connector (J005) is amplified by the microphone amplifier (IC107)
and fed to the main unit via interface connector (J006).
Receive signal for the handset is amplified by the audio amplifier (IC107) and fed to the microphone
connector.
Power Supply Circuit
The power supply for the Key/Display unit converts the DC 9 V from the main unit to generates each
voltage power for the Key/Display unit.
The 9 V voltage is fed to the audio circuit, indicator LED and back light LED.
The 5 V voltage is generated by the voltage regulator IC (IC102) and fed to the back light of the LCD.
The 3.3 V voltage is generated by the voltage regulator IC (IC103) and fed to the CPU, LCD module
and other digital circuit.
The 1.5 V voltage is generated by the voltage regulator IC (IC105) and fed to the CPU core.
1.5 V power will be turn on after turn ON the 3.3 V regulator.
The reset IC (IC108) generates the reset signal at power on the radio and reset the CPU.
CM5000 Mobile Repeater/Gateway - Basic Service Manual OVERVIEW