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Motorola Commercial Series Service Information

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Commercial Series
CP040 Radios
Power Distribution and Controller
Service Information
Issue: October 2004

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Summary of Contents for Motorola Commercial Series

  • Page 1 Commercial Series CP040 Radios Power Distribution and Controller Service Information Issue: October 2004...
  • Page 2 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...

  • Page 3: Table Of Contents

    Table of Contents Chapter 1 THEORY OF OPERATION 1.0 Overview......................1-1 2.0 Radio Power Distribution ..................1-1 3.0 Controller Circuits ....................1-3 3.1 General ......................1-3 3.2 Microprocessor Circuitry ................1-4 3.3 Audio Circuitry....................1-8 Chapter 2 TROUBLESHOOTING CHARTS 1.0 Troubleshooting Flow Chart for Board and IC Signals (includes Controller, DC Regulation and Audio) ..........

  • Page 5: Overview

    Chapter 1 THEORY OF OPERATION Overview This Chapter provides a detailed theory of operation for the controller circuits in the radio. The components of these circuits are contained on the Main Board. Refer to the RF sections of this manual for the component location details and the parts lists of the Controller Circuits. Radio Power Distribution Accessories 20 pin Connector...
  • Page 6 THEORY OF OPERATION When the radio is turned on, SWB+ is present and is applied to: transistor switch Q494 (pins 1 and 6) which turns on Q493 RX audio power amplifier U490 voltage divider R420/R421 and port PE0, a microprocessor A/D input which measures battery voltage and radio on/off status The output of FET switch Q493 is applied to the control pins of regulators U310, U320 and U330, turning them on.

  • Page 7: Controller Circuits

    Controller Circuits Controller Circuits General The controller board is the central interface between the various subsystems of the radio. It provides the following functions: interface with controls and indicators serial bus control of major radio circuit blocks encoding and/or decoding of selective signaling formats such as PL, DPL, MDC1200 and QuikCall II interface to CPS programming via the microphone connector storage of customer-specific information such as channel frequencies, scan lists, and...

  • Page 8: Microprocessor Circuitry

    THEORY OF OPERATION Microprocessor Circuitry The microprocessor circuitry includes microprocessor (U401) and associated EEPROM and Flash ROM memories. The following memory IC's are used: Table 1-2 Radio Memory Requirements Reference No. Description Type Size U402 Serial EEPROM AT25128 16K x 8 U403 Static RAM (not used)
  • Page 9 Controller Circuits 3.2.3 Serial Bus Control of Circuit Blocks The microprocessor communicates with other circuit blocks via a SPI (serial peripheral interface) bus using ports PD2 (data into uP), PD3 (data out of uP) and PD4 (clock). The signal names and microprocessor ports are defined in Table 1-3.
  • Page 10 THEORY OF OPERATION 3.2.6 Sensing of Externally-Connected Accessories Port PJ1 is used to detect the presence of externally connected accessories. Port PJ1 (U401 pin 72) is normally low, unless accessories (lapel speaker microphone, lightweight headset, etc.) are used with the radio. This port is used to detect an accessory PTT or auto sensing of a VOX accessory.
  • Page 11 Controller Circuits 3.2.9 Microprocessor 7.3975 MHz Clock The 7.3975 MHz clock signal (uP_CLK) is provided from the ASFIC_CMP (U451 pin 28). Upon startup the 16.8MHz crystal provides the signal to the ASFIC_CMP, which sends out the uP_CLK at 3.8MHz until a steady-state condition is reached and the clock is increased to 7.3975MHz for the microprocessor.

  • Page 12: Audio Circuitry

    THEORY OF OPERATION Audio Circuitry 3.3.1 Transmit and Receive Low-Level Audio Circuitry The majority of RX and TX audio processing is performed by U451, the Audio Filter IC (ASFIC_CMP), which provides the following functions: Tone PL/Digital PL encoding and decode filtering Tone PL/Digital PL rejection filter in RX audio path TX pre-emphasis amplifier TX audio modulation limiter...
  • Page 13 The Motorola RLN4460 Portable Test Set and PMKN4004 Programming Test Cable provide the proper interface between the radio's ungrounded audio output and ground-referenced test equipment.
  • Page 14 1-10 THEORY OF OPERATION 3.3.6 Battery Charging Through Microphone Jack A wall-type charging power supply may be connected to the 2.5 mm microphone jack (part of accessory connector J451). The voltage present at the tip contact (pin 4) is applied to the center charging contact of the battery via diode D470.
  • Page 15 Chapter 2 TROUBLESHOOTING TABLES Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) This section contains detailed troubleshooting tables. These tables should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques.
  • Page 16 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PD4_SCK serial clock input Microprocessor PD5_SS 3.23 ASFIC chip select PD6_VLIN 3.23 EEPROM chip select PG7_R_W 3.21 PG6_AS 3.23 PG0_XA13 3.23 PB7_ADDR15 0.026 PB6_ADDR14 0.028 PB3_ADDR11 3.06 PB1_ADDR9 3.05 PB2_ADDR10 0.16 3.23...
  • Page 17 Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) IC Designator Pin Function DC Voltage Comments (Condition) U401 PH7_CSPROG 3.05 Microprocessor VDDL 3.23 VSSL PH6_CSGP2 3.23 PH5_CSGP1 3.23 PH4_CSIO PH3_PW4 3.21 On/off control output PH2_PW3 PH1_PW2 3.00 PH0_PW1 3.23...
  • Page 18 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 3.23 Microprocessor 3.23 Bottom option button 3.23 Top option button PA0_IC3 PA1_IC2 1.57 PA2_IC1 3.00 PA3_IC4_OC5_OC1 3.00 PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR VDDR 3.23 ECLK (NU) 1.60...
  • Page 19 Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) IC Designator Pin Function DC Voltage Comments (Condition) U404 3.06 Flash ROM 3.08 3.05 0.13 0.31 3.17 EN_WE 3.21 From U401-4 3.23 RESET 3.20 U404 3.17 Flash ROM 0.30 0.22 3.03...
  • Page 20 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 VDD for analog circuits 3.00 ASFIC_CMP DISC audio input 1.34 From U510 Ground for analog circuits DACU output DACR output DACG output 2.38 (typ) Power set (TX mode) VOX peak detector output 2.91 PLCAP for DC integrator 0.40...
  • Page 21 Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB5 general purpose output ASFIC_CMP RX audio send to option 1.48 Modulation output 1.50 To U201-10 RX audio out to power amp 1.51 Flat TX audio return from option 0.20...
  • Page 22 TROUBLESHOOTING TABLES...
  • Page 23 Chapter 3 CONTROLLER SCHEMATICS Allocation of PCBs and Schematic Diagrams The Controller circuits are contained on the printed circuit board (PCB) containing the RF circuits. This Chapter shows the schematics for the Controller circuits only, refer to the relevant RF section for details of the related RF circuits, the PCB component layouts and the complete radio parts lists.
  • Page 24 CONTROLLER SCHEMATICS...
  • Page 25 Controller Schematics Controller Schematics SW_B+ OPT_MIC OPT_TX_AUD_FLAT_RETURN OPT_TX_AUD_RETURN PWR_SET PWR_SET OPT_TX_AUD_SEND CNTL_PWR_SET DEMOD OPT_RX_AUD_SEND_DETECTOR DEMOD CNTL_DEMOD OPT_RX_AUD_SEND_UNMUTED AUDIO BW_SEL BW_SEL OPT_RX_AUD_RETURN CNTL_BW_SEL MOD_OUT MOD_OUT CNTL_MOD_OUT VS_AUDIO_SEL 16_8_MHZ 16_8_MHZ VS_GAIN_SEL CNTL_16_8_MHZ E500 BK1005HM471 C500 C501 1000pF D3_3V SW_B+ SPI_CLK CNTL_SPI_CLK SPI_DATA_OUT CNTL_SPI_DATA_OUT R502 SYNTH_CS...
  • Page 26 Controller Schematics D3_3V R410 R416 R417 C418 0.1uF D3_3V D3_3V TP405 D3_3V R411 R406 R401 Q425 220K 300K D3_3V R419 D3_3V D3_3V 4.7K C425 TP402 C419 D3_3V Q426 1000pF 100K Q410 R407 D3_3V R412 R402 R408 C411 C413 C410 C412 100K 100K 0.1uF...
  • Page 27 Controller Schematics 150 mV RMS (25 kHz) (Rx) R523 75 mv RMS (12.5 kHz) (Rx) R516 R522 100K C512 C514 6.8pF 16pF R512 R514 Q520-2 150K 100K IMX1 5V_A R511 100K Q520-1 DEMOD R513 R515 IMX1 C518 0.1uF OPT_RX_AUD_SEND_DETECTOR 5V_A C460 0.1uF R470...
  • Page 28 Controller Schematics R516 R523 Audio C512 C514 R522 Q520 6.8pF 16pF IMX1 100K R512 150K R514 5V_A 100K U510-1 LM2904 Q520 IMX1 R511 C518 R513 DEMOD C460 VR471 100K R515 0.1uF OPT_RX_AUD_SEND_DETECTO R R470 5V_A U510-2 0.1uF C511 C513 2.2K LM2904 OPT_RX_AUD_RETURN 220pF...
  • Page 29 Controller Schematics USWB+ U310 TK71750S 7.5 V VOUT CTRL F301 DATA BYPASS J301 C301 C313 C304 C310 C311 C303 C312 390pF D301 .01uF .01uF .018uF VR301 33uF .01uF 10uF MMBZ5250B D3_3V BATT_CHARGE 5 V (Rx) Q311 0 V (Tx) C314 R310 100K 1200pF...
  • Page 30 Controller Schematics DC Regulation USWB+ U310 TK71750S F301 VR301 J301 MMBZ5250B 1 VIN VOUT 4 CTRL D301 C301 C303 C304 C312 BYPASS C311 C313 DATA 47pF .01uF .018uF .01uF 33uF 10uF Q311 C310 .01uF D3_3V BATT_CHARGE VR302 C314 R310 MMBZ5250B 100K C302 1200pF...

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