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Motorola Commercial Series Service Information

Motorola Commercial Series Service Information

Vhf1 136-162mhz
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Commercial Series
CP040 Radios
VHF1 (136-162MHz)
Service Information
Issue: October 2004

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Summary of Contents for Motorola Commercial Series

  • Page 1 Commercial Series CP040 Radios VHF1 (136-162MHz) 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 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CP040 Model Chart .....................1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 VHF (136-162MHz) Receiver................2-1 2.1 Receiver Front-End ..................2-2 2.2 Receiver Back-End..................2-3 3.0 VHF (136-162MHz) Transmitter................2-4 3.1 Transmitter Power Amplifier ................2-4 3.2 Antenna Switch....................2-4 3.3 Harmonic Filter ....................2-5...

  • Page 5: Model Chart And Technical Specifications

    Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS CP040 Model Chart CP040 VHF1 136-162 MHz Model Description MDH50JDC9AA1_N CP040 136-162 MHz 5W 4-Ch MDH50JDC9AA2_N CP040 136-162 MHz 5W 16-Ch Item Description PMUD1981_ CP040 136-162 MHz 5W 4-Ch Tanapa PMUD1982_ CP040 136-162 MHz 5W 16-Ch Tanapa PMLD4239_ CP040, Back Cover Kit 136-162 MHz 4-Ch PMLD4240_...

  • Page 6: Technical Specifications

    MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General VHF1 Frequency: 136-162 MHz Channel Capacity: 4 or 16 Channels 7.5 Volts ±20% Power Supply: Dimensions: with High Capacity Li-Ion Battery and with Standard NiMH Battery: 128.7mm H x 61.7mm W x 44.1mm D with Slim Li-Ion Battery: 128.7mm H x 61.7mm W x 41.3mm D...
  • Page 7 Technical Specifications Transmitter Specifications VHF1 RF Output High NiMH @ 7.5V: Frequency: 136-162 MHz Channel Spacing: 12.5/20/25 kHz Freq. Stability: 0.00025% (-30°C to +60°C) Spurs/Harmonics: -36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: +1, -3 dB (from 6 dB/oct.
  • Page 8 MODEL CHART AND TECHNICAL SPECIFICATIONS...

  • Page 9: Theory Of Operation

    Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the VHF circuits in the radio. Schematic diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual. VHF (136-162MHz) Receiver The VHF receiver covers the range of 136-162 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 10: Receiver Front-End

    THEORY OF OPERATION Receiver Front End Incoming RF signals from the antenna are first routed through the harmonic filter and antenna switch, part of the transmitter circuitry, before being applied to the receiver front end. The receiver front end consists of a preselector filter, RF amplifier, an interstage filter, and a double-balanced first mixer.

  • Page 11: Receiver Back-End

    VHF (136-162MHz) Receiver Receiver Back End The receiver back end is a dual conversion design. High IF selectivity is provided by FL51, a 4-pole fundamental mode 44.85 MHz crystal filter with a minimum 3 dB bandwidth of + 6.7 kHz, a maximum 20 dB bandwidth of ±12.5 kHz, and a maximum insertion loss of 3.5 dB.

  • Page 12: Vhf (136-162Mhz) Transmitter

    THEORY OF OPERATION VHF Transmitter The VHF transmitter covers the range of 136-162 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (5 watts) and low power (1 watt), or is factory preset to 2 watts. The transmitter is divided into four major blocks as shown in Figure 2-2.

  • Page 13: Harmonic Filter

    VHF Transmitter Harmonic Filter The harmonic filter consists of components C130-C136 and L130-L132. The harmonic filter is a seven-pole elliptical low-pass configuration, optimized for low insertion loss, with a 3 dB frequency of approximately 180 MHz and typically less than 0.8 dB insertion loss in the passband. Antenna Matching Network The harmonic filter presents a 50Ω...

  • Page 14: Vhf (136-162Mhz) Frequency Generation Circuitry

    THEORY OF OPERATION VHF Frequency Generation Circuitry The frequency generation system, shown in Figure 2-3, is composed of two circuit blocks, the Fractional-N synthesizer IC U201, the VCO/Buffer IC U251, and associated circuitry. Figure 2-4 shows the peripheral interconnect and support circuitry used in the synthesizer block, and Figure 2-5 details the internal circuitry of the VCOBIC and its interconnections to the surrounding components.

  • Page 15: Fractional-N Synthesizer

    VHF Frequency Generation Circuitry Fractional-N Synthesizer The Fractional-N synthesizer, shown in Figure 2-4, uses a 16.8 MHz crystal (Y201) to provide the reference frequency for the system. External components C201-C203, R202 and D201 are also part of the temperature-compensated oscillator circuit. The dc voltage applied to varactor D201 from U201 pin 25 is determined by a temperature-compensation algorithm within U201, and is specific to each crystal Y201, based on a unique code assigned to the crystal that identifies its temperature characteristics.

  • Page 16: Voltage Controlled Oscillator (Vco)

    THEORY OF OPERATION Voltage Controlled Oscillator (VCO) The VCOBIC (U251), shown in Figure 2-5, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U251 pin 19) determines which oscillator and buffer are enabled. A sample of the RF signal from the enabled oscillator is routed from U251 pin 12 through a low pass filter, to the prescaler input of the synthesizer IC (U201 pin 32).

  • Page 17: Troubleshooting Tables

    Chapter 3 TROUBLESHOOTING TABLES 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. It is advisable to refer to the related detailed circuit descriptions in the theory of operation sections prior to troubleshooting a radio.
  • Page 18 TROUBLESHOOTING TABLES Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8. Check Q70, Y70, U51. 3. RX audio buffer fault Verify audio is present at U451-2.

  • Page 19: Troubleshooting Table For Synthesizer

    Troubleshooting Table for Synthesizer Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic. connected to U251-5 and 6. only) Check dc voltages at U251 pin 2 Check for shorts/opens, replace...

  • Page 20: Troubleshooting Table For Transmitter

    TROUBLESHOOTING TABLES Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. TX LED indication) is pressed. 2. EXT MIC PTT fault Verify U401-72 goes low when J471- Check/replace Q470, L471 etc.
  • Page 21 Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action Poor TX range, 1. RF test jack defective Verify continuity of J140 pins 3 and 4 Replace J140. conducted power in RX mode only . 2. Antenna matching net- Visually inspect components C140- Repair/replace if necessary.

  • Page 22: Troubleshooting Table For Board And Ic Signals

    TROUBLESHOOTING TABLES Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling 1.20 2nd LO osc output 4.02 2nd LO osc input 4.60 RSSI output 0.74 (no received signal) 4.70 Audio feedback...
  • Page 23 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 4.25V (typ) (TX mode) 6.59 (TX mode) RF output Do not measure Ground U150 Unit 1 output 5.8V (typ) (TX mode)
  • Page 24 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU) 3.76 Superfilter output 4.52 Superfilter input 4.96 Prescaler input 1.97 Prescaler ground Prescaler Vdd 2.99 Prescaler Vref (NU) 1.97...
  • Page 25 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00 TX VCO emitter (RX mode) TX VCO base (RX mode) GND_LOGIC Vcc_LOGIC 3.00 TRB input...
  • Page 26 3-10 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17 3.17 PG5_XA18 PG3_XA16 3.21 PG2_XA15 0.30 PB4_ADDR12 0.22 PF7_ADDR7 3.03 PF6_ADDR6 3.08 PF5_ADDR5 3.06 PF4_ADDR4 0.16 PF3_ADDR3 0.26...
  • Page 27 Troubleshooting Table for Board and IC Signals 3-11 IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01 TX enable 3.23 Green LED enable Red LED enable 2.98 Lock detect from U201-4 MODB_VSTBY...
  • Page 28 3-12 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor 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 EXTAL 1.70 Clock from U451-28 XTAL 1.40 Not used VDDSYN XFC (NU) RESET...
  • Page 29 Troubleshooting Table for Board and IC Signals 3-13 IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69 0.94 1.08 0.78 0.59 0.66 0.67 0.75 EN_CE 3.01 From U401-38 0.16 EN_OE From U401-86...
  • Page 30 3-14 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84 Squelch detect digital output To U401-83 PL/low speed data I/O 1.50 High speed data I/O 3.00...
  • Page 31 Troubleshooting Table for Board and IC Signals 3-15 IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46 Ground Unit 2 (+) input 0.28 Unit 2 (-) input 0.29 Unit 2 output 4.96...
  • Page 32 3-16 TROUBLESHOOTING TABLES...
  • Page 33 Chapter 4 VHF PCB/SCHEMATICS/PARTS LISTS Allocation of Schematics and Circuit Boards VHF (136-162MHz) The VHF circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the VHF circuits, the Controller circuits are contained in Section 2 of this manual.

  • Page 34: Speaker And Microphone Schematic

    VHF PCB/SCHEMATICS/PARTS LISTS Speaker and Microphone Schematic MATES WITH J470 ON RADIO BOARD MATES WITH J491 ON RADIO BOARD 1.3.1 Speaker and Microphone Parts List Reference Motorola Part Description Designator 5080258E16 Microphone, electret 5005679X04 Speaker assembly with connector...

  • Page 35: Vhf Pcb 8486769Z02-A Schematic Diagrams

    VHF PCB 8486769Z02-A Schematic Diagrams VHF PCB 8486769Z02-A Schematic Diagrams D301 R406 R480 C488 C465 C458 C454 U425 Q425 R408 R405 D425 Q426 C480 S444 R401 C513 R403 J471 R473 R470 R409 U451 FL54 R496 C470 L265 L255 C257 D262 C473 R481 R472...
  • Page 36 VHF PCB 8486769Z02-A Schematic Diagrams C140 R206 L120 C206 C220 SH200 R416 U151 R411 L132 L130 C417 C222 R121 R434 C135 C131 R502 R433 L140 R432 C221 FL51 R150 R501 C223 C224 C157 R151 R120 D121 R154 C123 C124 C152 R227 C228 C227...
  • Page 37 VHF PCB 8486769Z02-A Schematic Diagrams USWB+ USWB+ TX_ENA TX_ENA PWR_SET TX_VHF_R1 PWR_SET DEMOD DEMOD RX_BE RX_FE_VHF_R1 BW_SEL BW_SEL IF_IN IF_OUT RX_IN RX_OUT RSSI RSSI CONTROLLER MOD_OUT MOD_IN PRESC PRESC 16_8_MHZ 16_8_MHZ RX_INJ V_STEER V_STEER SYNTH_CS SYNTH_CS SYNTH_VHF_R1 VCO_VHF_R1 V_SF V_SF SPI_CLK SPI_CLK VCO_MOD...
  • Page 38 VHF PCB 8486769Z02-A Schematic Diagrams 5.0V (Rx) 0V (Tx) FE_5R 6.8K 1000pF 3.95V (Rx) UMT1 500mV (RF) 3.95V (Rx) IF_OUT FE_IF_OUT 560nH 3.38V (Rx) 1000pF 100nH 2.0V (Rx) 1000pF 0.1uF 6.8K 150nH 82pF 3.9V (Rx) 700mV (RF) 68nH 10pF 36pF 68nH 27pF 33pF...
  • Page 39 VHF PCB 8486769Z02-A Schematic Diagrams RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K SH50 SH52 TC7W04F SHIELD SHIELD U52-4 2.4K...
  • Page 40 VHF PCB 8486769Z02-A Schematic Diagrams V_SF FN_V_SF 4.5V C231 C232 C233 1000pF 0.1uF 4.7uF R230 R247 110K 160K LOCK FN_LOCK LOCK: 3V UNLOCK: 0V WARP C204 470pF INDMULT SFOUT ADAPTSW CCOMP LOCK C241 REFSEL IADAPT 1200pF IOUT V_STEER PRESC PREIN R245 FN_V_STEER 3.0V to 8.0V...
  • Page 41 VHF PCB 8486769Z02-A Schematic Diagrams V_SF V_SF L270 4.5V VCO_VSF R273 560nH C292 1200pF C270 C274 C285 1200pF R270 0.1uF 0.1uF VCO_3V C272 0.1uF L282 R284 L292 47nH R272 68nH 9.1K C273 R271 8.2K .01uF 1200 mV (RF) R274 L271 C271 TX_INJ TX_IADJ...
  • Page 42 VHF PCB 8486769Z02-A Schematic Diagrams 4-10 7.5 V USWB+ PA_USWB+ C170 0.1uF 0 V (Rx) 7.4 V (Rx) R171 0.15 V (Tx) Q171 TX_ENA MMBT3904 Q170 PA_TX_ENA 6.8K EMB10 1.8V (Tx) R524 0 V (Rx) 7.25 V (Tx) C172 1500pF 0 V (Rx) C157 0.1uF...

  • Page 43: Vhf Pcb 8486769Z02-A Parts List

    VHF PCB 8486769Z02-A Parts List 4-11 VHF PCB 8486769Z02-A Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Part No. Part No. Part No. Circuit Motorola 2109445U41 CAP, 22pF C101 2113743L21 CAP, 1500pF C141 2113740F35 CAP, 22pF Description Part No.
  • Page 44 VHF PCB 8486769Z02-A Parts List 4-12 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C218 2113743F18 CAP, 2.2uF C268 2109445U13 CAP, 2.7pF C315 2113743L19 CAP, 1200pF C422 2113743L41 CAP, .01uF...
  • Page 45 VHF PCB 8486769Z02-A Parts List 4-13 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C467 2113743L19 CAP, 1200pF C505 2113743L17 CAP, 1000pF E451 2480640Z01 bead, BK1005HM471 2113743N52 CAP, 120pF...
  • Page 46 VHF PCB 8486769Z02-A Parts List 4-14 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. L292 2413926N22 IDCTR, 68nH Q494 4802245J54 dual digital NPN, UMG5 0662057M91 RES, 5.1K R212...
  • Page 47 VHF PCB 8486769Z02-A Parts List 4-15 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. R286 0662057M01 RES, 0 R423 0662057N23 RES, 100K R481 Not_Placed RES, 100K R513 Not_Placed...
  • Page 48 3 V voltage regulator, Y201* 4880114R06 crystal, 16.8 MHz, 14R06 TK71730S Y202 Not_Placed 45J68 U403 Not_Placed SRM2B256 * Motorola Depot Servicing only U425 5162852A09 LOW PWR OP AMP W/RAIL TO RAIL U451 5185130C53 audio filter (ASFIC.cmp), 30C53 U480 Not_Placed LM2904...

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