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Motorola CP140 Series Service Information
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Motorola CP140 Series Service Information

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Commercial Series
CP140/CP160/CP180
Portable Radios
UHF3 (465-495MHz)
Service Information
Issue: December 2003

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Summary of Contents for Motorola CP140 Series

  • Page 1 Commercial Series CP140/CP160/CP180 Portable Radios UHF3 (465-495MHz) Service Information Issue: December 2003...
  • 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 CP140/CP160/CP180 Model Chart ..............1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 UHF3 (465-495MHz) Receiver ................2-1 2.1 Receiver Front-End ..................2-2 2.2 Receiver Back-End..................2-3 3.0 UHF3 (465-495MHz) 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 CP140/CP160/CP180 Model Chart CP140/CP160/CP180 Series, UHF3, 465-495 MHz Model Description MDH65SDC9AA2AN CP140, 465-495 MHz, 4 W, 16 Ch. Non-Display Model MDH65SDF9AA3AN CP160, 465-495 MHz, 4 W, 32 Ch. Limited Keypad Model MDH65SDH9AA4AN CP180, 465-495 MHz, 4W, 64 Ch. Full Keypad Model Item Description PMUE1978_...

  • Page 6: Technical Specifications

    MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General UHF3 Frequency: 465-495 MHz Channel Capacity: 16, 32, or 64 Channels 7.5 Volts ±20% Power Supply: Dimensions with: High Capacity Li-Ion battery 130.5mm H x 62mm W x 45mm D NiMH FM, battery 130.5mm H x 62mm W x 45mm D NiMH Std battery...
  • Page 7 Technical Specifications Transmitter Specifications UHF3 RF Output High NiMH @ 7.5V: Frequency: 465-495 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 UHF circuits in the radio. Schematic diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual. UHF (465-495MHz) Receiver The UHF receiver covers the range of 465-495 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

    UHF (465-495MHz) 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: Transmitter Power Amplifier

    THEORY OF OPERATION UHF Transmitter The UHF transmitter covers the range of 465-495 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 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

    UHF Transmitter Harmonic Filter The harmonic filter consists of components C130-C136 and L130-L132. The harmonic filter is a seven-pole Chebychev low-pass configuration, optimized for low insertion loss, with a 3 dB frequency of approximately 655 MHz and typically less than 0.8 dB insertion loss in the passband. Antenna Matching Network The harmonic filter presents a 50Ω...
  • Page 14 THEORY OF OPERATION UHF 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

    UHF 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) 2.65 (typ) (TX mode) 6.59 (TX mode) RF output Do not measure Ground U150 Unit 1 output 4.20 (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 UHF3 PCB/SCHEMATICS/PARTS LISTS Allocation of Schematics and Circuit Boards UHF2 (465-495MHz) The UHF circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the UHF circuits, the Controller circuits are contained in Section 2 of this manual.
  • Page 34 UHF3 PCB/SCHEMATICS/PARTS LISTS...

  • Page 35: Uhf3 Pcb 8486634Z02-O Schematic Diagrams

    UHF3 PCB 8486634Z02-O Schematic Diagrams UHF3 PCB 8486634Z02-O Schematic Diagrams D301 C488 C465 R480 C458 C454 C513 S444 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L255 L265 C470 R253 C267 C473 R481 R472 C256 C257 C302 C489 C482 R522 L264 F301...
  • Page 36 UHF3 PCB 8486634Z02-O Schematic Diagrams C121 C124 R206 C206 C52 C53 R416 C220 D121 C417 C136 U151 R411 L121 C222 C134 R434 C123 R502 R433 C122 R432 C135 C141 C221 FL51 R150 R501 C223 C157 L132 L141 C131 C224 C158 C159 R151 SH200...
  • Page 37 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 USWB + USWB + USWB+ USWB TX_ENA TX_ENA PWR_SET TX_UHF_R3 PWR_SET DEMOD DEMOD RX_FE_UHF_R3 RX_BE CONTROLLER BW_SEL BW_SEL IF_IN IF_OUT RX_IN RX_OUT TX_INJ RSSI RSSI RX_INJ MOD_OUT MOD_IN PRESC PRESC 16_8_MHZ 16_8_MHZ RX_INJ VCO_UHF_R3 V_STEER V_STEER...
  • Page 38 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 Front End FE_5R 5.6K 390pF SH40 SHIELD SHIELD UMT1 390pF 390pF 22nH 0.1uF 5.6K C521 4.2V C523 3.7% 1.2K 390pF 2.7pF C522 0.5pF IF 1 0.5pF 0.79V RX_IN 1.1% 1.25% 1.3% 2.3% 1.6% 4.3pF 6.2pF 390pF...
  • Page 39 UHF3 PCB 8486634Z02-O 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 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 Synthesizer FN_V_SF 4.5V V_SF C231 C232 C233 R230 R247 1000pF 0.1uF 4.7uF SH201 SH200 SHIELD SHIELD FN_LOCK LOCK LOCK: 3V C204 31 NC3 UNLOCK: 0V WARP 470pF 29 NC2 INDMULT 17 NC1 SFOUT ADAPTSW 42 CCOMP LOCK...
  • Page 41 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 VCO V_SF VCO_VSF L270 R273 R277 4.5V V_S F 220nH C270 C274 VCO_3V C292 390pF 0.1uF 390pF L272 C285 C272 0.1uF 220nH SH253 SH250 SH251 0.1uF SHIELD SHIELD SHIELD L282 18nH L292 R284 C273 15nH R272...
  • Page 42 4-10 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 Tx PA_USWB+ USWB+ PA_TX_EN A TX_ENA C170 390pF Q171 Q170 EMB10 SH100 SHIELD C525 390pF C172 R120 C157 C154 390pF 0.1uF 390pF R152 100K 1% R121 C160 R158 C151 R153 U151 100K 390pF 1.5K C150...

  • Page 43: Uhf3 Pcb 8486634Z02-O Parts List

    UHF3 PCB 8486634Z02-O Parts List 4-11 UHF3 PCB 8486634Z02-O Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Parts List Part No. Part No. Part No. Circuit Motorola Not_Placed CAP, 10pF C107 Not_Placed CAP, 27pF C205 Not_Placed CAP, 2.7pF Description Part No.
  • Page 44 4-12 UHF3 PCB 8486634Z02-O Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C264 2109445U14 CAP, 3.0pF C400 Not_Placed CAP, .022uF C457 2113743E20 CAP, 0.1uF C505 2113743L17...
  • Page 45 UHF3 PCB 8486634Z02-O Parts List 4-13 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. FL53 9180469V05 CFWC455E L262 2413926N17 IDCTR, 27nH 0662057M92 RES, 5.6K R120 0662057C55 RES, 150...
  • Page 46 SH52 2686424Z01 SHIELD Y202 Not_Placed 45J68 R423 0662057N23 RES, 100K R491 0662057M01 RES, 0 SH100 2686418Z01 SHIELD * Motorola Depot Servicing only R424 0662057V35 RES, 200K R492 0662057N08 RES, 24K SH200 2686424Z01 SHIELD R425 0662057V27 RES, 100K R493 0662057N35 RES, 330K...

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