Motorola Radius Cm200 Cm300 Pm400 Detailed 6881098c00 A Manual
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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, 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. P2P1P3P4 PM400 PERS4 P2P1P3P4 CM300 PERS4
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 information. 2.1 Power Supplies The power supply to the head is taken from the host radio’s 9.3V via connector J803-9, The 9.3V is used for the LEDs and back light, the 5V is used for the LCD driver and level shifter. The stabilized 3V is used for the other parts. 2.2 SPI Interface The host radio (master) communicates with the head through its SPI bus. Three lines are connected to the shift register (U801):SPI clock (J803-17), SPI MOSI (J803-16) and shift register chip select (J803-15). Shift RegisterBCD To 7-segment Mux. Control Keypads DTMF ResistorsPTT circuit 2 pin speaker connector 7-segment display9.3V Keypad Backlight 9.3V Row/ColumnControl line Boot_res / SCI DTMF Row/Column Boot_res (DTMF- Column)/ SCI (DTMF-Row) Shift RegisterBCD To 7-segment Mux. Control Keypads DTMF ResistorsPTT circuit 2 pin speaker connector 7-segment display9.3V Keypad Backlight 9.3V Row/ColumnControl line Boot_res / SCI DTMF Row/Column Boot_res (DTMF- Column)/ SCI (DTMF-Row) 4
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 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 will connect one specific resistor of each divider line to ground level and thereby reduce the voltages on the analog lines. The voltages of the lines are A/D converted inside the µP (ports PE 6 - 7) and specify the pressed button. To determine which key is pressed, the voltage of both lines must be considered. The same analog lines also support a keypad microphone. A microphone key press is processed in the same manner like a head key press. 2.4 Status LED’s and Back Light Circuit All indicator LEDs (red, yellow, and green) are driven by current sources. To change the LED status the host radio sends a data message to the head shift register via the SPI bus. The head shift register determines the LED status from the received data and switches the LEDs on or off via Q5- Q7. The back light for the keypad is always on. The back light current for the keypad is drawn from the 9.3 V source and led by two current sources. The LED current is determined by the resistor at the emitter of the respective current source transistor. 2.5 Microphone Connector Signals The MIC_PTT line (J802-3) is grounded when the PTT button on the microphone is pressed. When released, this line is pulled to 9.3V by R805. Two transistor stages (Q802, Q801 and associated parts) are used to level shift between 9.3V and 3.3V required for the uP while keeping the same sense (active low for PTT pressed). Two of the mic socket lines (J802-2,7) have dual functions depending on the type of microphone or SCI lead connected. An electronic switch (U803) is used to switch these two lines between mic keypad operation or SCI operation. The switch (mux) is led by the uP through J803-20 with level shifting (and inversion) provided by transistor Q812. When MUX_CTRL (J803-20) is low the electronic switch is in the mic keypad mode. The mic socket (J802) pin 2 is connected to the keypad row line that goes to J803-13 and pin 7 is connected to the keypad column line that goes to J803-12. When MUX_CTRL (J803-20) is high the electronic switch is in the SCI mode. The mic socket (J802 pin 2) is connected to the SCI line that goes to J803-4 and pin 7 is connected to the BOOT_RES line that goes to J803-11. The HOOK line (J802-6) 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 (U803) 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 SCI operation. This mode is also used to select low cost mic operation where the gain of the microphone path is increased (on the main board) to compensate for not having a pre-amp in the low cost mic.
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. The speaker is connected to the speaker connector P801. The control head speaker must be disconnected if an external speaker, connected on the accessory connector, is used. 2.7 Electrostatic Transient Protection Electrostatic transient protection is provided for the sensitive components in the control head by diodes VR801, VR802, VR803 and VR804. The diodes limit any transient voltages to tolerable levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.
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 connector J103-9, The 9.3V is used for the LEDs and back light, the 5V is used for the LCD driver (U3) and level shifter (U4). The stabilized 3V is used for the other parts. 3.2 SPI Interface The host radio (master) communicates with the control head through its SPI bus. Three lines are connected to the shift register (U8):SPI clock (J103-17), SPI MOSI (J103-16), shift register chip select (J103-15) and LCD driver chip select (J103-18). 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. 8 pin JACK connector 9.3V LCD Shift RegisterBacklight Control Mux. Control Keypads Keypad ResistorsPTT circuit 2-pin speaker connector 9.3V LED Indicators Row/ColumnControl line Boot_Res / SCI DTMF Row/Column Boot_Res (DTMF- Column)/ SCI (DTMF-Row) Level ShifterLCD DriverLED Backlight 8 pin JACK connector 9.3V LCD Shift RegisterBacklight Control Mux. Control Keypads Keypad ResistorsPTT circuit 2-pin speaker connector 9.3V LED Indicators Row/ColumnControl line Boot_Res / SCI DTMF Row/Column Boot_Res (DTMF- Column)/ SCI (DTMF-Row) Level ShifterLCD DriverLED Backlight
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 will connect one specific resistor of each divider line to ground level and thereby reduce the voltages on the analog lines. The voltages of the lines are A/D converted inside the µP (ports PE 6 - 7) and specify the pressed button. To determine which key is pressed, the voltage of both lines must be considered. The same analog lines also support a keypad microphone. A microphone key press is processed in the same manner like a control head key press. 3.4 LCD Driver The LCD (36 x 4 segemnts) is controlled by U3. It has an on onboard clock controlled by R28 (typically 20kHz measured on pin 2). U3 is operated from the 5V supply and is controlled over the SPI bus (SPI_CLK J103-17, SPI_MOSI J103-16, LCD chip select J103-18). Chip select is active low. U2 is used to provide level shifting between the 3.3V logic from the uP and the 5V required by U3. 3.5 Status LED’s and Back Light Circuit All indicator LEDs (red, yellow, and green) are driven by current sources. To change the LED status the host radio sends a data message to the control head shift register via the SPI bus. The control head shift register determines the LED status from the received data and switches the LEDs on or off via Q8-Q10. Backlighting for the LCD and keys is provided by a matrix of 21 LEDs arranged in 7 columns of 3 rows. The LEDs are driven from a constant current circuit (Q12, U1 and associated parts). There are 4 levels of baclight: off, low, medium and high, which are controlled by two outputs (pins 15, 1) from the shift register (U8). The current is controlled by transistor Q12. The op amp U1 monitors the current by measuring the voltage drop across R26, R27 and adjusting the bias of Q12 to achieve the required level as set by the combined shift register o/ps. When in the off state, Q11 is also turned on to clamp the base of Q12 so as to force it off. This ensures that the LEDs are fully off. Q11 is controlled by pin 3 of the shift register U8. 3.6 Microphone Connector Signals The MIC_PTT line (J102-3) is grounded when the PTT button on the microphone is pressed. When released, this line is pulled to 9.3V by R33. Two transistor stages (Q14, Q13 and associated parts) are used to level shift between 9.3V and 3.3V required for the uP while keeping the same sense (active low for PTT pressed). Two of the mic socket lines (J102-2, 7) have dual functions depending on which type of microphone or SCI lead that is connected. An electronic switch (U41) is used to switch these two lines between mic keypad operation or SCI operation. The switch (mux) is controlled by the uP through J103-20 with level shifting (and inversion) provided by transistor Q41. When MUX_CTRL (103-20) is low the electronic switch is in the mic keypad mode. The mic socket (J102) pin 2 is connected to the keypad row line that goes to J103-13 and pin 7 is connected to the keypad column line that goes to 103-12. When MUX_CTRL (103-20) is high the electronic switch is in the SCI mode. The mic socket (J102 pin 2) is connected to the SCI line that goes to J103-4 and pin 7 is connected to the BOOT_RES line that goes to J103-11.
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 SCI operation. This mode is also used to select low cost mic operation where the gain of the microphone path is increased (on the main board) to compensate for not having a pre-amp in the low cost mic. If the BOOT_RES (J102-7) line is connected to >5V (e.g. 9.3V) at turn-on then 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). 3.7 Speaker The control 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 controller is fed via connector J103-1, 2 to the speaker connector P101 pin 1 and pin 2. The speaker is connected to the speaker connector P101. The control head speaker must be disconnected if an external speaker, connected on the accessory connector, is used. 3.8 Electrostatic Transient Protection Electrostatic transient protection is provided for the sensitive components in the control head by diodes VR1 - VR4. The diodes limit any transient voltages to tolerable levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.
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, R814 on Control Head ? A YES No YES No