Motorola L304 Manuel de service

DetailedService ManualcontactcontrolProfessional RadioCA, Motorola, Professional Radio, PRO Series and PRO Modelnumbers and HT Series and HT Model num

viii2.9 VHF Transmitter... 2-12Figure 2-10:VHF

3-38 900 MHz Troubleshooting ChartsRF Signal atthe input ofFL300?IF Signal atL353?NoRF Signal atpin 8 of U301?RF Signal atCR300?NoNo orCheck harmonic

900 MHz Troubleshooting Charts 3-39Check C163,C127, andC142 for opencircuit.Is the fuseF501 OK?Is there ashort circuitafter C113?Is overall radiocurre

3-40 900 MHz Troubleshooting Charts5Vat pin 6 ofD201.Is informationfromµP U409correct?Is U201 Pin 28at 4.6 VDC?Is U201 Pin 47AT = 13 VDCStartVisualche

4-1Chapter 4Schematic Diagrams, Overlays, and Parts Lists4.1 IntroductionThis chapter provides schematic diagrams, overlays, and parts lists for the r

4-24.2 Flex LayoutFigure 4-1: Keypad-Controller Interconnect FlexLAYER 1 (L1)LAYER 2 (L2)LAYER 3 (L3)LAYER 4 (L4)LAYER 5 (L5)LAYER 6 (L6)INNER LAYERSS

4-34.2.1 Keypad-Controller Interconnect Flex SchematicFigure 4-2: Keypad-Controller Interconnect Flex Schematic Diagram4.2.2 Keypad-Controller Interco

4-44.2.3 Universal Flex Connector Figure 4-3:Universal Flex ConnectorFront MetalView From Top Side20J403J404J405J406J407J408J409J410J411J412J413J414J4

4-54.2.4 Universal Connector Flex SchematicFigure 4-4: Universal Flex Connector Schematic Diagram4.2.5 Universal Flex Connector Parts ListReference Sy

4-64.2.6 Keypad Top and Bottom OverlaysFigure 4-5: Keypad Top and Bottom Board OverlaysTop ViewBottom ViewD601 D602D603D604 D605D606M604 M605 M606M607

MANUAL REVISION4-2-02®© 2002 by Motorola, Inc.Commercial, Government and Industrial Solutions Sector8000 W. Sunrise Blvd., Ft. Lauderdale, FL 33322Pri

ix2.18.3 Automatic Gain Control Circuit ... 2-282.18.4 Frequenc

x3.5 VHF Troubleshooting Charts ... 3-15Troubleshooting Flow Chart f

xiFigure 4-9:VHF/UHF Complete Controller Schematic Diagram... 4-13Figure 4-10:VHF/UHF Controller ASFIC/ON_OFF Schem

xiiFigure 4-51:UHF (450-527MHz) Voltage Controlled Oscillator Schematic Diagram ... 4-75Figure 4-52:UHF (450-527MHz) Transmitter Schematic Diagram.

xiiiFigure 4-90:Low Band (29.7-42/35-50MHz) Frequency GenerationUnit Synthesizer ...

xiv

1-1Chapter 1Introduction1.1 Scope of ManualThis manual is intended for use by service technicians familiar with similar types of equipment. Itcontains

1-2 Related Documents1.3 Related DocumentsThe following documents are directly related to the use and maintainability of this product.1.4 Technical Su

Radio Model Chart and Specifications 1-31.5 Radio Model Chart and SpecificationsThe radio model charts and specifications are located in the Basic Ser

1-4 Radio Model Information.Table 1-2 Radio Model NumberExample: AAH25KC9AA2 and LAH25KDC9AA3Type of UnitModel SeriesFreq. BandPower LevelPhysical P

2-1Chapter 2Theory of Operation2.1 IntroductionThis chapter provides a detailed theory of operation for the radio components. Schematic diagramsfor th

2-2R = Regulator Jumper2.3 KeypadThe keypad block diagram is shown in Figure 2-2. The comparator compares the voltage when anyone of the keypad row or

2-32.4 Controller BoardThe controller board is the central interface between the various radio functions. It is separated intoMCU digital and audio/si

2-42.4.1 Real Time ClockRadios with displays support a real time clock (RTC) module for purposes of message time stampingand time keeping. The RTC mod

2-52.4.1 Audio/Signaling The audio/signalling/filter/companding IC (ASFIC) and the audio power amplifier (Figure 2-3) form themain components of the a

2-62.5.2 Antenna SwitchThe antenna switch circuit consists of two pin diodes (CR101 and CR102), a pi network (C107, L104and C106), and two current lim

2-7Figure 2-6: UHF Receiver Block Diagram2.6.1 Receiver Front-EndThe RF signal received by the antenna is applied to a low-pass filter. For UHF, the f

2-8The IF signal coming out of the mixer is transferred to the crystal filter (FL301) through a resistor padand a diplexer (C322 and L310). Matching t

2-9compared to normal operation at room temperature. Resistor R300 and Capacitor C397 form an R-Cnetwork used to dampen any transient instability whil

Safety-iSAFETY AND GENERAL INFORMATIONIMPORTANT INFORMATION ON SAFE AND EFFICIENT OPERATIONREAD THIS INFORMATION BEFORE USING YOUR TWO-WAY RADIOThe in

2-10To achieve fast locking for the synthesizer, an internal adapt charge pump provides higher current atU201 (pin 45) to put the synthesizer within l

2-11transmit mode, the audio signal to be frequency modulated onto the carrier is received through U201(pin 41).When a high impedance is applied to U2

2-122.9 VHF TransmitterThe VHF transmitter consists of the following basic circuits as shown in Figure 2-10.• Power amplifier• Antenna switch/harmonic

2-132.9.3 Harmonic FilterThe harmonic filter consists of components C3532 to C3536, L3531, and L3532. This network forms alow-pass filter to attenuate

2-14Figure 2-11: VHF Receiver Block Diagram2.10.1 Receiver Front-EndThe RF signal is received by the antenna and applied to a low-pass filter consisti

2-15The IF signal coming out of the mixer is transferred to the crystal filter (Y3200) through a resistor pad(R3321 - R3323) and a diplexer (C3320 and

2-16pin is limited by resistors R3316, R3313, R3306, and R3324. Feedback capacitor C3326 providessome stability to this high gain stage.An additional

2-17The loop filter, which consist of C3721, C3722, R3721, R3722, and R3723, provides the necessary dcsteering voltage for the VCO and determines the

2-18During the transmit condition, when PTT is pressed, 3.2 volts is applied to U3801, pin 19. Thisactivates the transmit VCO by enabling the transmit

2-192.13 Low Band TransmitterThe low band transmitter consists of the following basic circuits as shown in Figure 2-15.• Power amplifier (PA).• Antenn

Safety-iiBody-Worn OperationTo maintain compliance with FCC RF exposure guidelines, if you wear a radio on your body whentransmitting, always place th

2-20disconnecting the transmitter from the antenna while L103 and C147 form a series resonant circuiteffectively connect the receiver to the antenna.2

2-21Figure 2-16: Low Band Receiver Block Diagram2.14.1 Receiver Front-EndThe RF signal received by the antenna is routed through the transmitter lowpa

2-222.14.2 Receiver Back-End The output of crystal filter FL301 is connected to the input of IF amplifier transistor U301. ComponentsL303 and C348 and

2-235V signal goes to pins 13 and 30 while the 3.3V signal goes to pins 5, 20, 34 and 36 of U201. Thesynthesizer in turn generates a superfiltered 4.3

2-24Figure 2-18: Low Band Synthesizer Block Diagram2.16 Voltage Control Oscillators (VCO)2.16.1 Receive VCOThe receive VCO is a Colpitts type design a

2-25rejecting the receive LO injection signals at 139 - 160 MHz. This filter is comprised of L204, L211,L212, C230 and C231.The other filter is a high

2-26This RF driver IC is capable of supplying an output power of 0.3W (pin 13 and 14) with an input signalof 2.5mW (4dBm) (pin16). The current drain w

2-272.18 800 MHz ReceiverThe receiver functions are shown in Figure 2-20 and are described in the paragraphs that follow.Figure 2-20: 800MHz Receiver

2-282.18.2 Receiver Back-EndThe output of crystal filter FL350 is matched to the input of the dual gate MOSFET IF amplifiertransistor U352 by componen

2-29• the slope of the voltage at the output of U302 vs. the strength of the incoming RF at the antenna.As the RF into the antenna increases the follo

Safety-iiiSAFETY AND GENERAL• Use While DrivingCheck the laws and regulations on the use of radios in the area where you drive. Always obey themWhen u

2-30Transmit modulation from the ASFIC is supplied to pin10 of U201. Internally the audio is digitized bythe Fractional-N and applied to the loop divi

2-312.19.1 Voltage Control Oscillator (VCO)The voltage controlled oscillator block diagram is shown in Figure 2-23.Figure 2-23: 800 MHz VCO Block Diag

2-32The operation logic is shown in Table 2-7.In the receive mode, U250 pin 19 is low or grounded. This activates the receive VCO by enabling therecei

2-33for customization for special requirements, and provision made to further standardized features to beadded to the protocol in the future. The stan

2-342.20.4.5 BackLight Driver and LED'sThe logic level signal from the radio microcontroller is translated via Q611 and applied to Q610 whichuses

2-35The 900 MHz transmitter contains the following basic circuits:• power amplifier• antenna switch• harmonic filter• power control integrated circuit

2-362.22 900 MHz ReceiverFigure 2-25: 900 MHz Receiver Block Diagram2.22.1 Receiver Front-EndThe RF signal is received by the antenna and applied to a

2-372.22.2 Receiver Back-EndThe output of crystal filter FL350 is matched to the input of the dual gate MOSFET IF amplifiertransistor U352 by componen

2-38*RX1:receive voice with carrier squelch, PL or DPL (Flutter Fighter can be on or off).**RX2:refers to receive mode with all other data HST/MDC/DTM

2-39The output of inverter U350 is also used to control the receiver front end AGC.The receiver front end automatic gain control circuit provides and

Safety-ivIntrinsically Safe Radio InformationFMRC Approved EquipmentAnyone intending to use a radio in a location where hazardous concentrations of fl

2-40the microprocessor. A 3.3V dc signal from synthesizer lock detect line indicates to the microprocessorthat the synthesizer is locked.Transmit modu

2-412.25 900 MHz Voltage Control Oscillator (VCO)Figure 2-28: VCO Block DiagramThe VCOBIC (U250) in conjunction with the Fractional-N synthesizer (U20

2-42The operation logic is shown in Table 2-9.In the receive mode, U250 pin 19 is low or grounded. This activates the receive VCO by enabling therecei

3-1Chapter 3Maintenance3.1 IntroductionThis chapter of the manual describes:• Preventive maintenance• Safe handling of CMOS devices• Repair procedures

3-2 Safe Handling of CMOS and LDMOSisopropyl alcohol to the frame, front cover, or back cover.3.4 Safe Handling of CMOS and LDMOSComplementary metal-o

General Repair Procedures and Techniques 3-3• Chip ComponentsUse either the RLN-4062 Hot-Air Repair Station or the Motorola 0180381B45 Repair Station

3-4 Recommended Test Tools• Next, rub the soldering iron tip along the edge of the shield to smooth out any excess sol-der. Use solder wick and a sold

Replacing the Circuit Board Fuse 3-53.7 Replacing the Circuit Board FuseIn cases where the radio fails to turn on when power is applied, the circuit b

3-6 Replacing the Circuit Board FuseFigure 3-1:UHF/VHF/Low Band/800MHz/900MHz Circuit Board Fuse LocationsC108J101432J102R1012S501C8C4CR303L303SH302C3

Removing and Reinstalling the Circuit Board 3-73.2 Removing and Reinstalling the Circuit Board Both the UHF and VHF circuit boards are removed from th

Safety-vRepair of FMRC Approved ProductsREPAIRS FOR MOTOROLA FMRC APPROVED PRODUCTS ARE THE RESPONSIBILITY OF THE USER.You should not repair or relabe

3-8 Power Up Self-Test Error CodesFor LTR Models:No Display improperly connecteddisplay module ordamaged displaymodule.check connection between main b

UHF Troubleshooting Charts 3-93.4 UHF Troubleshooting ChartsMCU CheckPower UpAlert ToneOK?SpeakerOK?U409 EXTAL=7.3728 MHz?U201 Pin 1916.8 MHz5V at U24

3-10 UHF Troubleshooting ChartsBad SINADBad 20dB QuietingNo Recovered AudioSTARTAudio at pin27 of U301?Check ControllerYesNoInduce or inject 1st IF in

UHF Troubleshooting Charts 3-11IF Signalat L311?NoRF Signal atT301?RF Signal atC310?NoRF Signal atC307?NoRF Signal atC301?No orCheck harmonic filter L

3-12 UHF Troubleshooting ChartsSTARTNo PowerIs There B+Bias for AntswitchCheck Q111Is CurrentOK?Is Control Volt-age High or LowCheck PCIC1. Check Pin

UHF Troubleshooting Charts 3-135Vat pin 6 ofCR201Is informationfrommPU409correct?Is U201 Pin18Is U201 Pin47Is U241 Pin 19<0.7 VDC in RX &>4.

3-14 UHF Troubleshooting ChartsSTARTNo LO?Tx Carrier?VCO OKCheckR260TRB = 5V?Pin 10>1V?L253 O/C?ChangeL253ChangeU241AUX 3High?Check U201Pin 2 for 3

VHF Troubleshooting Charts 3-153.5 VHF Troubleshooting ChartsMCU CheckPower UpAlert ToneOK?SpeakerOK?U409 EXTAL=7.3728 MHz?U3701 Pin 1916.8 MHz5V at U

3-16 VHF Troubleshooting ChartsBad SINADBad 20dB QuietingNo Recovered AudioSTARTAudio at pin27 of U3220?Check ControllerYesNoInduce or inject 1st IF i

VHF Troubleshooting Charts 3-17IF Signal atC3200?NoRF Signal atT3301?RF Signal atR3313?NoRF Signal atC3306?NoRF Signal atC3302?No orCheck harmonic fil

Safety-viThis page intentionally left blank.

3-18 VHF Troubleshooting ChartsSTARTNo PowerIs There B+Bias for AntswitchCheckQ3561Is CurrentOK?Is Control Volt-ageHighorLowCheck PCIC1. Check Pin Dio

VHF Troubleshooting Charts 3-195Vat pin 6 ofD3701Is informationfrommPU409correct?Is U3701Pin18AT4.54 VDC?Is U3701 Pin 47AT = 13 VDCIs U3701 Pin 19<

3-20 VHF Troubleshooting ChartsSTARTNo LO?Tx Carrier?VCO OKCheckR3829TRB = 3.2V?Pin 10>1V?L3831,L3832,L3833 O/C?ChangeL3831, L3832ChangeU3801AUX 3H

Low Band Troubleshooting Charts 3-213.6 Low Band Troubleshooting ChartsMCU CheckPower UpAlert ToneOK?SpeakerOK?U409 EXTAL=7.3728 MHz?U205 Pin 1917.0MH

3-22 Low Band Troubleshooting ChartsActivity onU303 sel pin?Bad SINADBad 20dB QuietingNo Recovered AudioSTARTAudio at pin27 of U303?Check ControllerYe

Low Band Troubleshooting Charts 3-23IF Signal atL301?NoRF Signal atT501?RF Signalat collectorQ509?NoRF Signal atC504?NoRF Signal atC147?No orCheck tra

3-24 Low Band Troubleshooting ChartsSTARTNo PowerIs Current~2A?Is control voltageat U101 Pin 1 > 5Check PCIC1. Check Pin Diodes2. Check Harmonic Fi

Low Band Troubleshooting Charts 3-25Is U205, pin18 at 4.54VDC?Signalsat Pin 14 and15 of U205?Is informationfrommPU409correct?Is U205 Pin47 > 12VIn

3-26 Low Band Troubleshooting ChartsLevel >+2 dBmCheck signal atcollector of Q201NoYesCheck L204, L211, L212,L215, C221, C228, C229,C230,C231, C235

800 MHz Troubleshooting Charts 3-273.7 800 MHz Troubleshooting ChartsMCU CheckPower UpAlert ToneOK?SpeakerOK?U409 EXTAL=7.3728 MHz?U201 Pin 1916.8 MHz

viiTable of ContentsChapter 1 Introduction1.1 Scope of Manual ...

3-28 800 MHz Troubleshooting ChartsBad SINADBad 20dB QuietingNo Recovered AudioSTARTAudio atpin27ofU351?Check ControllerYesNoSpray or inject 1st IF in

800 MHz Troubleshooting Charts 3-29RF Signal atthe input ofFL300?IF Signal atL353?NoRF Signal atpin 8 of U301?RF Signal atCR300?NoNo orCheck harmonic

3-30 800 MHz Troubleshooting ChartsIs the fuseF501 OK?Is there ashort circuitafter C113?Is overall radiocurrent between0.8 and 1.3 Awhen transmit-ting

800 MHz Troubleshooting Charts 3-315Vat pin 6 ofD201Is informationfromµP U409correct?Is U201 Pin 28at 4.6 VDC?Is U201 Pin 47AT = 13 VDCStartVisualchec

3-32 800 MHz Troubleshooting ChartsIs the Tx RFlevel at C254about 0dBm?Are the biasvoltages ofQ251 as indi-cated?Is the 1.9Vpresent atR266 as indi-cat

PassPort Trunking Troubleshooting Chart 3-333.8 PassPort Trunking Troubleshooting ChartStartCheck Radio Operation on aNon PassPort Zone with aConventi

3-34 Keypad Troubleshooting Chart3.9 Keypad Troubleshooting ChartDisplayKeypadLEDEndDisconnect andreconnect 18-pinflexDisconnect andreconnect 40-pinfl

900 MHz Troubleshooting Charts 3-353.10 900 MHz Troubleshooting ChartsAudio atPin E4U851?Press PTT. RedLED does not lightup.PTT U409 Pin53low?Press PT

3-36 900 MHz Troubleshooting Charts7.5V atPin 3/5 U202?4/3.3V at Pin 1U203.5V at U202?3.3V at U203?MCU Check.Power UpAlert ToneOK?SpeakerOK?U409 EXTAL

900 MHz Troubleshooting Charts 3-37Bad SINAD.Bad 20dB Quieting.No Recovered Audio.STARTAudio atpin27ofU351?Check Controller.YesNoSpray or inject 1st I