PYE Beaver M254 Service Manual Download

Page: 78 / 99

Summary of Contents for Beaver M254

Page 1: ...Service Manual Pye Telecommunications Ltd Beaver VHF FM Mobile Radiotelephone Types M254 M256 Publication Ref No TP271 ...

Page 2: ... domestic waste This service manual is for the maintenance of Pye Telecommunications equipment The performance figures quoted are typical and are subject to normal manufacturing and service tolerances The right is reserved to alter the equipment described in this manual in the light of future technical development BEAVER VHF FM MOBILE RADIOTELEPHONE TYPES M254 AND M256 SERVICE MANUAL ISSUE 1 MARCH...

Page 3: ...ment number 4 Should it be necessary to raise the issue of a publication the amendment numbering will recommence with No 1 Amend t No Date Initials Remarks 1 October 1978 Incorporated on Reprint ERRORS OMISSIONS The usefulness of this publication depends upon its accuracy Whilst every endeavour has been made to minimise errors some may exist It is therefore requested that any errors or omissions n...

Page 4: ...N 3 TECHNICAL DESCRIPTION Receiver Circuit Summary 3 1 Transmitter Circuit Summary 3 2 Power Distribution and Switching 3 3 12 5V Restrictor and 10V Regulator 3 4 Control Panel Front Mount 3 4 Control Unit Remote Mount 3 4 RF Front End 3 6 Oscillator Modules 12 channel Oscillator 3 7 Single Channel Oscillator 3 8 6 channel Oscillator 3 9 PA Module 3 10 Antenna Filter and Changeover Relay 3 10 Rece...

Page 5: ... ACCESS 4 5 Tools Required 4 5 Procedure 4 5 Module Replacement 4 6 TEST EQUIPMENT 4 8 CRYSTAL INFORMATION 4 9 ALIGNMENT PROCEDURE AND PERFORMANCE CHECKS Test Points TPs 4 9 Measuring Points MPs 4 9 Identification of Modules and Components 4 10 Signal Generator Levels 4 10 Intermediate Frequencies 4 10 Multiple Channel Equipments 4 10 Multi meter 4 10 General Preliminary Checks and Adjustments 4 1...

Page 6: ... Remote Mount Radiotelephone Type M256 Complete 5 7 Remote Mount Transceiver Type M256 5 10 RF Front End Module 1 5 11 IF Amplifier and Squelch Module 2 5 13 Squelch A Sub module 2A 5 14 Receiver and Transmitter Oscillator Module 3 5 15 Receiver Oscillator Multiplier Module 4 5 16 12 5V Restrictor and 10V Regulator Module 6 5 18 Transceiver Audio Module 7 5 19 Transmitter Exciter Module 8 5 22 Tra...

Page 7: ...cility Socket Interconnections 4 7 Fig 4 4 Diode Probe Circuit Diagram 4 8 Fig 4 5 Connection of AF Output Meter 4 8 Fig 5 1 Eploded Diagram 5 23 Fig 6 1 Complete Mother Board Layout Fig 6 2 Receiver Circuit Diagram Fig 6 3 Transmitter Circuit Diagram Fig 6 4 Receiver Earlier Modules and Component Layout Diagram Fig 6 5 Transmitter Earlier Modules and Component Layout Diagram Fig 6 6 Transceiver O...

Page 8: ...negative or floating ground 24V operation available by separate regulator unit Receive standby M254 360mA approx M256 440mA approx Transmit 4 25A On Off switch Squelch Volume Channel selector Reset Lock Defeat Switch Power on also illuminates channel selector and volume control Transmit Call Lamp Main Unit 198mm wide x 93mm high includes M254 mounting plate x 241mm deep 7 8 x 3 6 x 9 5 in Main Uni...

Page 9: ...5052 20 db quieting for 0 35W PD signal input 12 db SINAD for 0 250V PD signal input M254 3 0W with less than 5 distortion at 1 kHz M256 2 5W with less than 5 distortion at 1 kHz 1 db to 3 db of a 6 db per octave de emphasis characteristic from 300 Hz to 3 kHz 70 db 85 db 6 db quieting at threshold Sensitivity adjustable Transmitter Output Impedance 50Ct Power Output 15W minimum at 13 8V DC input ...

Page 10: ...rystal controlled frequencies in the range 68 to 174 MHz using either single or two frequency simplex working 4 Single and multiple channel versions are available in multiple channel equipments provision is made for up to 12 communication channels spaced at 12 5 kHz 20 kHz or 25 kHz within 0 5 of the centre frequency The channel spacing can be changed by replacing the IF Amplifier and Squelch Modu...

Page 11: ... on the Frequency Label attached to the rear of the transceiver frame assembly Should the equipment be supplied less crystals it should be checked on the recommended Test Frequencies as detailed under Test Frequency Crystal Information in Section 2 Installation Items The equipment can be supplied by agreement as follows Less Installation Items With Installation Items including Bulkhead Loudspeaker...

Page 12: ... be nqted that these prefix numbers are applicable ONLY TO THE BEAVER TYPES M254 AND M256 Receiver Modules 1 RF Front End 2 IF Amplifier and Squelch 4 Receiver Oscillator Multiplier Transmitter Modules 8 Transmitter Exciter 9 Power Amplifier Common Modules 3 Receiver Transmitter Oscillator Single and Multiple Channel 7 Transceiver Audio 6 12 5V Restrictor and 10V Regulator 10 Antenna Filter and Ch...

Page 13: ... supply for 13 8V output 3 Using Signal Generator AF Output Meter and RF Output Meter see Test Equipment on page 4 8 for suitable types check equipment serviceability as follows a Connect AF Output Meter set to 30 impedance as shown in fig 4 5 across the brown and blue loudspeaker leads connect Signal Generator to Antenna Socket NOTE Crystals are normally fitted before shipment and the Frequency L...

Page 14: ...Multiplication Test Freq MHz Rx Injection Freq MHz A Tx 13 2175 X12 158 61 Rx 13 9583 X12 10 7 MHz 156 8 167 50 B Tx 12 250 X12 147 00 Rx 13 5708 X12 10 7 MHz 152 15 162 85 E Tx 6 500 X12 78 00 Rx 7 950 X12 10 7 MHz 84 70 95 40 CONTENTS LIST INSTALLATION ITEMS FOR FRONT AND REMOTE MOUNTS PART Nos DESCRIPTION Qty REMARKS AT05225 Transceiver M254 or 1 Front Mount only AT05226 Transceiver M256 1 Remo...

Page 15: ... for mounting screws Soldering iron Drill Sizes Drill for No 6 Self Tapping Screws Drill for No 10A Self Tapping Screws Drill for No 8 Self Tapping Screws Allen Key M2 5 and M3 2 35 mm or No 42 3 40 mm or No 29 2 9 mm or No 33 NOTES The item to be fitted can be used as a drilling template Detail of the screws required to secure the installation items is shown in the Contents List If possible the c...

Page 16: ...embly location ensure that it allows adequate clearance at the rear 100 mm at the left hand side 50 mm for the power and the antenna plugs of the transceiver and that the front panel projects beyond mounting surface to give access to controls 3 Install Cradle Assembly release lever to front Loudspeaker Control Unit Remote Mount only and Microphone Rest See Contents List for Fixing Screws NOTE The ...

Page 17: ...E PLUG INSULATOR PLAIN GASKET TRIM BRAID OFF HERE 6 7mm PLUG Fig 2 1 Typical Installation Front Mount 4 Mount the Antenna See Antenna Fixing Instructions for fitting details Connect the Feeder Plug as shown For best all round performance of the radiotelephone the antenna should be mounted on the centre of the vehicle roof 2 5 ...

Page 18: ...lack Negative Yellow Green Switching lead for A200 or VR200 White Ignition switching Brown LS Blue LS Secure fuse box 5 close to battery 6 ii Wire from battery 6 to connector block 4 live lead via fuse box if floating ground fuse both leads iii Connect transceiver power leads to connector block 4 Ensure that red positive end white ignition leads are connected to common terminal iv Plug in fist mic...

Page 19: ...ut Connector a Regulator VR200 for 24V DC Supply NOTE The VR200 casing is weather proof but for optimum reliability it should be mounted in an area free from constant wetting or immersion i Secure fuse box 15 close to battery 6 ii Wire from battery 6 to 24V input via fuse box 15 fusing both leads 5A iii Connect VR200 12V 3 core cable to 3 way connector block 18 iv Link connector blocks 4 and 18 so...

Page 20: ...o provide switching for the amplifier 2 The A200 should be mounted in a clean dry location on the route of the antenna feeder A200 FLOATING GROUND M254 INSTALLATION a Fit mounting plate b Locate 12A fusebox 15 close to the battery and 3 way connector block 18 within 1 m of A200 front panel c Wire from battery to 3 way connector block 18 2 5 mm or 70 0070 cable live lead via fusebox 15 fuse both le...

Page 21: ... A200 top cover cut links from mother board pins 4 5 and 2 3 b Connect the two connector blocks 13 and 14 so that the yellow green cores are linked CHANGE OF FREQUENCY PROCEDURE FM ONLY a Remove A200 cover b Disconnect antenna from A200 output socket Connect Po Aer Output Meter in its place c Key radiotelephone and tune as follov s AB and M Band Tune C8 and C17 for maximum output E Band Tune C8 C1...

Page 22: ...ver 7 Microphone Lead Assy 2 Antenna Feeder Cable 8 Microphone rest 3 Loudspeaker Assy 9 Cradle Assy 4 3 Way Connector Block 10 Release Lever 5 Fuse Holder 11 Carrier Plate and Cover 6 Vehicle Battery 12 Loudspeaker Lead 13 Remote Control Unit 14 Control Cable Fig 2 2 Basic Installation Front Remote Mount ...

Page 23: ...ll drawings shown in this Installation Procedure 1 Transceiver M254 7 Microphone Lead Assy 2 Antenna 9 Cradle Assy 3 Loudspeaker Assy 12 Loudspeaker Lead 5 Inline Fuses NOTE Numbers 4 6 8 10 and 11 are not used Fig 2 3 Basic Installation Motorcycle ...

Page 24: ...transceiver Tools Required Slot and Pozidriv Screwdrivers Allen Key M2 5 Spanner Open ended M6 Package Check Check package against Contents List for shortages and transit damage Note Pye Telecomnunications Ltd or our authorised agents must be advised by letter of any shortage or damage within 10 days of receipt Installation Procedure Note 1 Connecting Lead lengths are as follows Power 1 728m 5ft 8...

Page 25: ...r of the clamp 3 Interconnection a Mate Power and Loudspeaker lead with socket on the rear of Transceiver b Connect antenna feeder to antenna socket Secure feeder to edge of cradle with the 3 clips provided c Route and connect power lead to the battery See Note 3 and Schematic Diagram below d Route both sections of the loudspeaker lead and connect See Note 3 e Secure cable with rubber cleats f Con...

Page 26: ...he make up of the antennas The suffixes are read from the top of the antenna downwards e g GX100TS is a tapered rod with a spring The follovNing suffix letters are used S spring H hinge IS hinge and spring T tapered TS tapered with spring The various combinations available in the series are detailed in the table below Type Rod Rod Assembly Ref No Base Assembly Ref No Max Height Inc Base Standard M...

Page 27: ...00T II 5 41 92 RE c 1 4 2 151 160 1 0 18 21 2 06 9 51 60 0 85 30 00 110 1213 1313 1 15U 60 50 TRANSMITTER FREQUENCY TRANSMITTER FREQUENCY 5 25 30 52 2 IS II NMI W LHL 45 ANTENNA TYPE GX100S HS 10 91 JTL 101 40 MOEN 91 _ 5 H 81 111111 81 6 5 31111111 bi 444 61 z 5 20 51 15 11 31 v 68 G0 0 50 34 101 Ill 1 3 1 if 1 2 IR 19C 2 11515 TRANSMITTER FREQUENCY IIN I 7 J 1 4 1 I I 131 If 156 2 4iilillItillfi...

Page 28: ...through the hole in the structure the contact plate the earthing bracket the nut and the lock nut and feedthrough until the anchor bush enters the hole Secure the assembly with the nut and lock nut Place the sealing washer in position screw on the cover nut and attach the antenna rod assembly using the coin slot or Allen grub screw Run the cable over the best route to the radiotelephone avoiding s...

Page 29: ...e receiver noise just disappears NOTE This is the most sensitive setting of the Squelch control turning it further anti clockwise will supress weak interfering signals For Transmission a To avoid interfering with other users of the operating channel listen first to ensure that no transmissions are being made b Holding the microphone one or two inches from the lips press the press to talk switch an...

Page 30: ... out to ensure that channel is not in use Make your call using normal procedure and return the switch to LOCK at the end of your conversation Facility Cancellation and Re activation Set RST LOCK DFT switch to DFT to cancel any facility Set RST LOCK DFT switch to RST to re activate MD1 or MD1A identity Encoder type ME2 This module automatically transmits your identity code each time you operate you...

Page 31: ...e output from the Oscillator Module 3 which is frequency multiplied x12 by the 3 stage Oscillator Multiplier Module 4 before application to the mixer gate in Module 1 Amplified RF is applied to the source of the mixer and the resultant 10 7 MHz IF signal is coupled to the IF Amplifier and Squelch Module 2 at pin 1 FL1 a 10 7 MHz Crystal Filter determines the receiver sleectivity The filtered IF si...

Page 32: ...igh frequency band of noise After amplification the noise output is connected to pin 8 of Module 7 where the signal is processed to provide the gating voltage which mutes the audio The level at which this muting occurs is set by the Squelch Control TRANSMITTER CIRCUIT SUMMARY Fig 3 2 Transmitter Block Diagram Audio signals from the microphone are applied to the Transceiver Audio Module 7 at pin 2 ...

Page 33: ...t 5A the negative lead is switched by the ON OFF switch Protection against polarity reversal is provided by D1 of the 30 Way Interconnection Board A Restrictor and Regulator Module 6 provides 12 5V 10V and via press to talk switch the switched 10V 10V sw supplies to the appropriate modules as shown in fig 3 3 the Power Distribution and Switching block schematic diagram NOTE Input power supply swit...

Page 34: ...duce the quiescent current The regulated 12 5V output is bled off to various points around the equipment and to the 10V section of the Module 10V Supply AT27637 Transistor TR5 is a series regulator The voltage regulation circuitry is contained in the thick film sub module TF1 which generates the control voltage at TR5 base AT27883 Transistor TR7 is a series regulator controlled by TR8 which sample...

Page 35: ...TIP 34 R4 1111012 C3 1 22 T D4 loy D5 I111012 11 9 o T R7 D8 TIP30 11110121 R3 9 0 2 5 RI 0 1 330 220 55 D3 12 55 ADJ r RVI 1K TR6 2N5447 D6 ITT TR8 e9 4 09 ITT 220 T T R3 108 4K7 PBC 1 9 1V 0 R7 all R9 1012 PBC108 10 1012 C2 180 WilF 1 R13 1K 72 6 152 R6 I 4n7 511 1 1 R14 TIP 31 0 7 1K5 TR5 1 3 D2 390 0 6 I 1K 390 L 6 52 PBC108 10 CI 100n _5 _ TR4 PBC108 C4 4n7 I R8 _ _ 50 4157 C5 I 512 1K RIO 3K...

Page 36: ... the resonant circuit L7 C23 to the gate of TR3 The resultant mixer output of 10 7 MHz is developed across TR3 drain load consisting of L8 C25 C26 and coupled by C28 to the IF Amplifier and Squelch Module 2 via pin 2 of module 1 C II LI L2 1 3 QS TR1 12 L3 100 C1 3 2 15p 2 15p 01001 402 TR2 L4 0 5 L5 RI 1C0 18 3 I C2 1 1C01C F 2 1 4 2 15p 2_15p 2p2T C6 C1 1 _ C17 OP 3 2 72 15P 2 4 T _T I C23 T 1 1...

Page 37: ...2 Channel Selection The Channel switch SB of the Control Panel Front Mount or Control Unit Remote Mount completes the negative line to the transistor emitter contained in TF1 of the selected oscillator on both the receiver and the transmitter oscillator modules Switching In the receive condition the 12 5V supply is connected to the receive oscillator module at pin 15 via the un energised relay con...

Page 38: ...T27887 01 When fitted a link is required to override the channel switch AT27652 A channel oscillator comprises a thick film sub module TF1 a crystal XL1 operating in its fundamental mode capacitor C2 a trimmer C3 fo fine frequency adjustment and a decoupling capacitor C4 These components are repeated for each channel fitted One set of loading components C5 C6 R1 and R2 is fitted to each module AT2...

Page 39: ...he receiver oscillator b pin 15 of the Oscillator Module to activate the transmitter oscillator 6 Channel Oscillator Module 3 AT27652 03 or AT27887 02 Switching of this module is identical in all respects to the 12 channel version AT27652 3 Apart from the number of channels provided this module is identical in all respects to the 12 channel version AT27887 02 Individual oscillators are provided fo...

Page 40: ...is passed via a co axial feeder and a resistive matching network R1 R2 R3 to the input of the wideband power amplifier sub module TF 1 The output of the PA Module 18W nominal is fed to the Antenna Filter and Changeover Relay Module 10 ANTENNA FILTER AND CHANGEOVER RELAY 10 The RF output from PA Module 9 is passed via co axial feeder to a three section low pass filter which minimises the harmonic c...

Page 41: ... FILTER C O RELAY J L3 c n UNDERSIDE A BAND A127888 nUNDERSIDE B BAND AT27889 EiUNDERSIDE D BAND A127890 Al D1 MGD 25 RLA 2 16 L1 L2 L3 A2 C2 C4 C6 C1 C3 C5 i 10 13 14 2 L3 L2 LI RLA CS C8 0 az0 irludiadmau fro I11 U12 113 uRc rsu u16i17 TP271 1 3 11 ...

Page 42: ...hich selects the third harmonic This is applied to the base of doubler stage TR3 the second harmonic is selected by the resonant circuit L9 C27 and the resultant injection frequency signal is coupled by C29 to pin 6 and thence to the mixer stage in the RF Front End Module 1 Test points TP1 TP2 are provided in the emitters of TR2 and TR3 for alignment purposes CZ 2 2 RI1 I _2 10 2 2 C20 2n2 _ye C21...

Page 43: ... 100 100 100n 4n7 4n7 1K C6 I 4n7 V TR2 BF256LB _LC34 1407 C24 1 025 R6 47K _C32 CIO C12 C17 4n7 Ve C18 R13 2K2 15 TR3 4n7 4n7 22 T 33 Ve T4n7 TR6 TN3866 C26 C5 I 1p8 T184 R10 15 II ii L7 C29 C44 C47 4p7 R17 R22 TR1 BF256LB CI In I vs 12K 27K TR7 2N3866 ZTX310L Ve C11 Ve 1C3 C3 T180 R7 R8 R9 100K 100K R5 DI 4K7T MV MV 840 D2 840 TR4 ZTX310L TR5 ZTX310L 015 C21 1p8 C191C20 C231 T T 11 L1 1030 1n C4...

Page 44: ... 2 3 3 3 1 2 C13 6K8 C27 3 4 5 4n7 0 5 7 3 3 TH1 2 R3 6 0 1 5 2n2 T o o L4 R4 C R7 R8 I r 2n2 08 08 f C20 R13 4 5 47 R10 1 1mH 3K3 3K3 L C18 1 rt _ _2 _ A H C17 R2 R4 105 T100n C6 177 T C10104n 3K3 1n2T R 47 1 1P 3K3 C21 C23 C24 C31 C3 C30 1K2 470 T 47 P 2K 7 100n 4n7 4n7 RVI 3 4A T1OnT 10n T lOn 1 100nT 100n CI I 8 9 IF AMPLIFIER SQUELCH AT27880 AT27886 R3 R6 R8 150K 122K 5K6 TR1 PBC 108 6 p 8 R7...

Page 45: ...er and discriminator External components L3 C18 C20 comprise the discrete phase shift network for the quadrature detector Audio is fed out from IC2 pin 16 and any residual 225 kHz content is blocked by the filter L4 C23 C24 The filtered output is routed to the Transceiver Audio Module 7 and also to the input stage of the sub module via C28 In the absence of an acceptable signal the input to the su...

Page 46: ...22 470n R25 7 0 1 1 106 2 7 1R17 R20 467 668 2n2 186 R47 T R15 226 PBC108B MGD25 0 C27 47n 21 R21 2K2 1C4 RII 33 668 C22 C22 2p2 470n 100 C13 C16 33 560p C24 025_ 33 is R32 R35 636 R37 R39 P41 R4 3 R52 R59 R30 C9 6130p R3 R5 R9 5K6 363 1006 C3 336 OK 336 270 3K 262 10K 363 22K 156 820 In 5 10 13 TRANSCEIVER AUDIO AT278821 E COMPONENT SIDE 3 643204 4 52 27 U IUM1 1011 UUU 6 7 8 9 10 11 12 13 14 15 ...

Page 47: ...lter TF1 in Module 2 enters Module 7 at pin 8 and is processed by the thick film circuit T F2 SQUELCH B a thick film circuit which incorporates a noise operated squelch gate The audio signal derived in the IF Amplifier and Squelch Module 2 enters Module 7 at pin 13 and is de emphasised by R27 C13 filtered by the low pass active filter R14 C17 R15 TR 2 and amplified by TR3 The amplified audio is ap...

Page 48: ...otrusion Cut component free from its wire end and remove wire with pliers Should the wire end be too short to grasp with pliers it can be tapped out from the component side with a very find drift Servicing Compounds Module pins are gold plated and are not subject to oxidation Contamination from grease or dust should be removed by the application of contact cleaning fluid only such as R S Component...

Page 49: ...V Regulator Control Interface M256 It should be noted that Test Extensions are not required for the remaining modules as they can be analysed either in situ PA Module or when removed from the equipment Control Panel NOTE a Before using the RF Front End or IF Amplifier and Squelch Module Test Extensions remove the spring clips located on the sides of the module compartments of the equipment frame b...

Page 50: ... out Performance Checks and Alignment Procedures on remote mount transceivers In most installations it will be found relatively easy to remove the control unit but removing the control cable from an installation may be difficult and inconvenient In such instances it is recommended that a spare control cable Part No AT36384 01 is held for servicing ...

Page 51: ... the carrier plate cover can be either the top or bottom cover according to the mounting requirements Each cover is secured with four socket head screws In order to make the frame moisture proof sealing gaskets are provided on the flanged surfaces which mate with the covers The controls and outlets of the control panel Front Mount are fitted with seals and the mating surfaces of panel and frame ar...

Page 52: ...iter Module and carefully unsorder coaxial link connected to track side Power Amplifier Release two M2 5 x 15 mm socket head screws using M2 5 Allen Key Remove screws nuts and washers securing module to the frame Lift module and carefully unsolder the co axial on the component side Remove insulating wafer between frame and module CAUTION The casing is proofed against the ingress of moisture as als...

Page 53: ...emove pin connectors from Mother Board pins 1 2 3 4 5 and 6 on Front Mount equipment or pins 1 2 3 and 4 only on Remote Mount equipments Unsolder leads between PLH G and relay RLS and PLH J and relay RLS at the relay ends Remove the two M3 x 6 mm screws securing Relay Bracket through the Mother Board to the frame Remove Relay Bracket Remove the remaining eight screws securing the Mother Board to t...

Page 54: ...ink pins 8 and 12 of Options Interconnecting Board c Selective Call Module fitted no link required NOTE When aligning an equipment which normally employs a Selective Call Unit remove the Selective Call Unit and link pins Band 12 of Options Interconnecting Board For equipments not provided with an Options Interconnecting Board pins 3 and 11 of the 14 way lnterconnectingBoard must be linked at all t...

Page 55: ...Output Meter AF Output Meter Diode Probe Not required if TM1A is available Set of Trimming Tools Distortion Factor Meter Frequency Counter Control Cable Remote Equipments only Kit of Module Test Extension Assemblies FM NOTE If an Avo 8 Multimeter is used it is recommended that a probe set such as those shown below be employed Meter Probes Radio spares Type 1 423 431 Red Black or Meter Probes Radio...

Page 56: ... Crystal Crystal Freq fc Freq fx Range Spec fc A 148 to 174 MHz fx 12 33 to 14 50 MHz T54J0 12 fc B 132 to 156 MHz fx i2 11 00 to 13 00 MHz T54J0 2 fc E 68 to 88 MHz fx T 5 67 to 7 33 MHz T54J0 This specification applicable to UK only Specification for other areas available on application ALIGNMENT PROCEDURES AND PERFORMANCE CHECKS Test Points TP s Test points take the form of flat gold plated pin...

Page 57: ... i negative input line and frame ii positive input line and frame is greater than 1 megohm in each instance Set OFF ON switch to OFF b Connect AF Output Meter set to 3S1 impedance and connect 27Q in series with the loudspeaker see Fig 4 5 c Connect the Power Supply Unit to the power lead and adjust it for 13 8V output d Switch on the equipment and check that the ON lamp lights With the VOLUME cont...

Page 58: ...output level to give about 20 db quieting f Hold 10 7 MHz marker close to Module 2 input and tune signal generator to zero beat NOTE During steps g to I the signal generator output level should be reduced as the tuning proceeds to maintain about 20 db quieting Tune for maximum quieting h quieting Tune in sequence for maximum quieting Tune for maximum quieting Tune for maximum quieting b g 1 C9 C17...

Page 59: ...Key the transmitter and check that the TX lamp LP2 lights iii On the underside of the Mother Board locate the pin which mates with pin 3 on the sock of the TX Exciter Module 8 Connect diode probe see Fig 4 5 to it and check that al operational channels are oscillating iv Connect multimeter set to appropriate voltage range negative lead to 11C10 negative am connect positive lead to test point indic...

Page 60: ...Re tune for minimum L7 Tune for maximum 8V U Li d 8 L8 L7 8TP4 Tune in sequence for minimum L9 Tune for maximum 12V Connect multimeter 10A range in power supply live lead f 8 L9 Multimeter Re tune for maximum supply current g 8 L10 Multimeter Tune for maximum supply current h RF Output Check output is greater than 15W for Meter standard equipments not greater than 8 4W for West Germany If the Powe...

Page 61: ...scope check that the waveform is free from distortion Bandwidth i Select channel tuned to highest frequency ii Check 12 db Sinad is achieved with a signal generator output modulated at 1 kHz with 2 3 of peak deviation at a level of about 0 5 tiV PD iii Select channel tuned to lowest frequency and repeat ii Squelch i Sensitivity Check the squelch control range from threshold to maximum setting with...

Page 62: ...eviation ii Connect Distortion Meter across the audio output Notch out the fundamental of 1 kHz and reduce signal generator level until a distortion factor of 25 is measured This represents a ratio of signal noise distortion to noise distortion i e SINAD of 12 db iii The output of the signal generator should not exceed 0 5A PD to obtain a SINAD figure of 12 db TRANSMITTER PERFORMANCE CHECKS Note K...

Page 63: ...st lead input iv Adjust the AF Oscillator for an output of 7 mV RMS at 1 kHz Note deviation is at least 50 peak v Adjust the AF Oscillator level to obtain 50 of peak deviation Increase level by 20 db and adjust RV1 of Transceiver Audio Module 7 for peak deviation vi Using an oscilloscope check the waveform at the audio terminals of the deviation meter This should be a good sine wave The limited wa...

Page 64: ...ator Modules AT27652 07 Locate and remove link which is fitted in the oscillator multiplier compartment Fit multichannel boards a Receiver Oscillator inboard position AT27652 03 6 channel marked 2 on Mother Board or AT27652 04 12 channel b Transmitter outboard position AT27652 03 6 channel marked 1 on Mother Board AT27652 04 12 channel 4 17 ...

Page 65: ...shown thus 2 ohms 2 2 2 ohms 2k2 2 2 kilohms 22 x 102 2M2 2 2 Megohms 22 x 105 ABBREVIATIONS cadmium cad printed wire board PWB carbon c polyester poly ceramic cer steel st composition comp resin dipped r d countersunk csk tantalum tant electrolytic elec tubular tub parts per million ppm wire wound w w ORDERING OF SPARE PARTS When ordering spares please quote the description and Part No of the ite...

Page 66: ...t and Remote Mounts Installation Instruction and Contents List Motorcycle INSTALLATION ITEMS STANDARD Part No AT05225 AT29690 AT29689 AT12502 01 AT12502 02 BJ30657 BT08289 FS40860 FS40861 QJ11945 B AT13032 BT36502 BT17410 BT36928 BT18988 AT26335 Remarks Code Band Item 5 Item 2 includes Carrier Bracket Item 3 Item 14 Secure Items 2 5 14 10 off Power Plug Microphone Socket 2 Crystal Retainers 2 Osci...

Page 67: ...Large M5 Bulkhead Loudspeaker Bracket Loudspeaker Housing 2 way Socket Identification Sleeve AT26336 01 AT26336 02 Part No FT08070 BT17168 BT30081 F F99006 FH02837 FP13742 QW41212 A QY41214 A QJ13032 A QJ13051 A QA11609 A QA11610 A QA15009 A QA15010 A F H00642 F H 00629 AT26293 01 AJ13053 A QA1510 A QA11610 A QJ11916 X AT12740 01 AT10848 01 AT10850 AT26584 02 FA00823 BT24757 BT24758 FG02219 FP1374...

Page 68: ...90 Plug 7 way FP10847 Fist Microphone Assembly FH00638 02 Which includes Microphone Insert FM99004 Lead Assembly 240595 2 S G BROWN Part No Identification Sleeve FS20126 20 Resistor 68052 5 0 25W PM01434 Telephone Handset AT29689 Plug 7 way FP10847 Handset and Lead FH00643 01 Which includes Microphone Insert FM99004 Earpiece Insert FM03640 Identification Sleeve FS20126 19 Resistor 68052 5 0 25W PM...

Page 69: ...b Assembly Knob Assembly Knob Assembly Knob Assembly Knob Assembly Lens Red Lens Green Lens Amber Protection Plug Black Protection Plug Yellow Switch 1 pole 12 way Switch 2 pole 3 way Switch 1 pole 1 way Socket 7 way Potentiometer 250 linear Potentiometer 5k log Lamp 14V 6 mm Tub Screw Pan Taptite M3 x 12 mm Used on Single Channel Used on Non Facility Equipment links pins 3 and 11 of SKF Item 23 A...

Page 70: ...130 consisting of D1 R1 Item 16 Power 4 off Various colours Various colours 4 for Item 16 Not included in AT13057 Required only when facility Module is fitted 14 Way Interconnection Assembly which includes Printed Wire Board Guide Stand off Button PWB Interconnection Assembly which includes Printed Wire Board Assy Bracket Bracket Modular Connector Capacitor 1nF cer plate Lead Assembly Clip 48 0 5 ...

Page 71: ...ng Instructions BT36928 TP940 Installation Instruction and Contents List BT19989 TP807 INSTALLATION ITEMS AT26335 07 08 09 10 11 12 tPower Lead Assy AT12732 03 1 1 1 1 1 1 Cradle Assy Item 4 AT12836 1 1 1 1 1 1 tBagged Items AT26336 01 1 1 1 tBagged Items AT26336 02 1 1 1 tBulkhead L S 275590 03 1 1 tHorn Loudspeaker AT12742 02 1 1 tControl Cable Assembly 5 metres AT36384 05 1 1 1 1 1 1 From the a...

Page 72: ...hone Insert Earpiece Insert Resistor 680 5 0 25W CONTROL UNIT tControl Panel Assembly t Loudspeaker Lead Assembly tCableform assembly Front Cover Printed Screw socket hd M3 x 12 mm Bracket Gasket tBreakdown under headed list AT26336 01 02 Part No FT08070 BT17168 BT30081 FF99006 FH02837 FP13742 QW41212 A QY41214 A QJ13032 A QJ13051 A QA11609 A QA11610 A QA 15009 A QA 15010 A FH00642 FH00629 275590 ...

Page 73: ... off 1 in 1 in Item 29 250 mm various colours various colours 10 off 475 mm Control Unit Cont Description Unit label Bung Casting rear cover Cable gland Lock nut Screw Pan Pozi Taptite M2 5 x 6 mm Screw Pan Pozi Taptite M3 x 6 mm Screw Pan Pozi Taptite M3 x 8 mm Screw Hex Hd st cad M6 x 10 mm Washer shakeproof M6 Washer st cad M6 large Control Panel Assembly Panel Sub Assembly Knob Assembly Knob A...

Page 74: ...mplete Frame Assembly Label Frequency Screw Pan Taptite Part No AT14171 AT12514 AT14131 BJ30656 AT12504 02 BT03295 BT08295 BT17424 QJ11580 X1 BT26991 BT26996 BT36783 FP10819 QA13330 BT36937 QJ11553 X1 BT36908 AT13056 F R03994 BT11192 BT24763 FC00830 AT14129 FS40581 FC00820 08 FC00820 12 FC00798 FC04527 FW05063 B FW05063 U QJ11580 X1 AT13057 FP10831 FC00833 QJ11580 X1 AT12504 02 AT13030 01 BT18983 ...

Page 75: ... MHz 148 174 MHz 132 156 MHz 68 88 MHz Part No AT27642 02 or AT27879 01 AT27642 05 or AT27879 11 AT27642 03 or AT27879 02 AT27642 01 or AT27879 05 CAPACITORS Description Part No Op33 10 400V cer tub PN00115 1p2 10 160V cer tub PN00114 1p8 0p25 63V cer plate PN99750 2p2 0p25 400V cer tub PN01049 2p2 0p25 63V DC cer plate PN99751 2p7 0p25 400V DC cer tub PN01119 8p2 PN99758 15p 2 63V DC cer plate PN...

Page 76: ...Assembly AT31297 01 B L4 Coil Assembly AT31297 02 B L1 6 Coil Assembly AT31297 03 B L2 Coil Assembly AT31874 01 A ABE L8 Coil Assembly AT32402 03 A A L7 Coil Assembly AT32402 06 B L7 Coil Assembly AT32408 01 E L7 Loop AT32924 Bead Ferrite FJ00111 A ABE L9 Bead Insulating FJ00007 Core FC36120 ABE Part of L7 SEMICONDUCTORS Transistor J310 FV40804 A ABE TR1 A AB TR2 Transistor T1S88A FV08241 E TR2 AB...

Page 77: ...9 23 24 10n 20 80 40V cer disc PN99823 C3 30 31 100n 20 80 12V cer disc PN62335 C1 5 6 7 8 14 21 26 1p 20 35V tant r d PS99502 C25 33p 20 10V tant r d PS99508 C16 22 RESISTORS 10 5 0 125W c film PL99750 R6 47 5 0 25W c film PM01420 R3 100 PL99757 R5 12 470 PL99765 R4 1k2 PL99770 R2 2k7 PL99774 R11 3k3 5 0 125W c film PL99775 R7 8 10 13 4k7 PL99777 R16 6k8 PL99779 R9 10k PL99780 R1 47k PL99788 R17 ...

Page 78: ...rystal Filter 25 kHz FC99002 FL1 AT27644 02 or AT27880 03 only CRYSTAL Second Oscillator 10 925 MHz FC03174 Specification E52J0 MECHANICAL ITEMS Printed Wire Board Assy AT13207 AT27880 only Printed Wire Board Assy AT12501 AT27644 only Can Screening FC00126 For L1 L3 Can Screening BT15606 For T1 Guide BT17558 2 off Stand off Button BT36480 PWB SQUELCH A SUB MODULE 2A AT27886 CAPACITORS 1n 10 100V c...

Page 79: ...ated according to the number of channels required MECHANICAL ITEMS Printed Wire Board AT12530 Guide BT17558 Support Plate BT20029 Mounting for C3 RECEIVER AND TRANSMITTER OSCILLATOR MODULE 3 AT27887 Single Channel AT27887 01 6 Channel AT27887 02 See Note CAPACITORS 27p L1 350V s mica PP99212 C4 27p L2 63V cer plate PN99764 C10 68p 1 350V s mica PP99217 C6 150p 2 350V s mica PP99221 C5 4n7 10 63V c...

Page 80: ...CELLANEOUS Crystal To specification XL1 Printed Wire Board Assy All 3203 Guide BT17558 2 off Plate Mounting BT20111 Label BT18919 17 RECEIVER OSCILLATOR MULTIPLIER MODULE 4 AT27651 or AT27877 Complete Assembly Part No Band Freq Part No A 148 174 MHz AT27651 02 or AT27877 01 B 132 156 MHz AT27651 03 or AT27877 02 E 68 88 MHz AT27651 01 or AT27877 05 Part No Remarks Code Band PN99532 AB C18 PN99533 ...

Page 81: ...oil Assembly AT32402 05 B L9 Coil Assembly AT32407 03 A L6 E L9 Coil Assembly AT32407 04 A L7 Coil Assembly AT32408 02 B L6 Coil Assembly AT32408 05 B L7 Coil Assembly AT32410 02 A L3 E L6 Coil Assembly AT32410 06 A L4 Coil Assembly AT32410 08 E L7 Coil Assembly AT32417 01 B L4 Coil Assembly AT32417 02 B L3 Coil Assembly AT32428 01 E L3 4 Coil Assembly AT32428 01 E L3 4 Choke 007 FT99001 A L8 Chok...

Page 82: ...88 FV05814 D2 Diode Zener 10V FV05815 D5 Diode I N4001 F V05840 D1 Diode ITT1012 F V05842 D3 D4 Transistor PBC108A FV05801 TR3 4 Transistor TIP30 FV08231 TR5 Transistor TIP31 F V08232 TR2 Transistor TIP34 FV05701 TR1 THICK FILM CIRCUIT 10V Regulator FU00536 TF1 MECHANICAL ITEMS Printed Wire Board Assembly AT12494 Guide BT17558 Insulator Mica BT29211 for Heatsink I bats in k BT36646 Item 7 For TR1 ...

Page 83: ...eat sink BT36646 Item 7 1 TR1 TR2 Insulating Bead FJ00007 2 Resistors Hex Nut M3 QA11605 X 1 TR5 Screw Pozi Pan M3 x 6 mm QJ11901 X 1 TR1 1 TR2 1 TR5 TRANSCEIVER AUDIO MODULE 7 AT27780 04 CAPACITORS Description Part No Remarks Code Band 39p PN99766 C35 2 0 63V cer plate 180p PN99774 C18 470p 10 500V cer tube PN22129 C24 560p PN23360 C34 1n L10 100V cer plate PN99811 C2 17 2n2 PN99812 C33 4n7 PN998...

Page 84: ...2 FV05818 D1 2 4 Diode HSP1012 FV05842 D3 Transistor PBC108 FV05800 TR1 2 3 6 Transistor PBC108B FV05802 TR4 THICKFILM AND INTEGRATED CIRCUITS Microphone Amplifier Sub Module FU00534 TF1 Squelch B Sub Module FU00533 TF2 Audio Amplifier Sub Module FU99091 IC1 Choke Assembly AT31681 03 L1 MECHANICAL ITEMS Description Part No Remarks Code Band Printed Wire Board Assy AT13014 Spacer BT06513 1 off Guid...

Page 85: ...5 PM01454 R16 36 43 PL99173 R10 PM01456 R23 24 PM01460 R53 55 PL99178 R9 PM01465 R57 PM01469 R28 FV05800 TR1 to 12 16 17 FV05802 TR15 FV05828 TR 13 FV37832 TR14 CAPACITORS Description 180p 2 63V cer tub 470p 10 500V cer plate 560p 10 100V cer plate 680p 10 63V cer plate 1n 10 63V cer plate 1n8 10 100V cer plate 2n2 10 100V cer plate 3n3 10 63V cer plate 4n7 10 63V cer plate 10n 20 80 40V cer plate...

Page 86: ...of AT27882 TRANSMITTER EXCITER MODULE 8 AT27639 or AT27881 Complete Assy Part No CAPACITORS Band A E B Freq MHz 148 174 68 88 132 156 Part No AT27639 03 or AT27881 01 AT27639 02 or AT27881 05 AT27639 04 or AT27881 02 Description Part No Remarks Code Band 1p8 PN99750 AB C5 21 A C29 37 44 B C16 2p2 0p25 63V DC cer plate PN99751 BE C29 37 E C5 21 A C15 B C44 3p3 PN99753 E C15 4p7 PN99755 AB C47 10p P...

Page 87: ... R30 PM01426 E R20 PM01428 ABE R27 PM01432 E R1 2 PL99765 E R33 AT27881 only PM01434 AB R2 14 15 E R14 15 1k 5 0 125W c film PL99769 ABE 819 24 28 32 2k2 PM01440 AEB R13 23 3k9 PM01443 ABE R18 4k7 PM01444 ABE R4 5 10k 5 0 25W c film PM01448 AB R1 12k PM01449 ABE R22 27k PM01453 ABE R17 47k PM01456 ABE R6 100k PM01460 ABE R8 9 INDUCTORS Coil Assembly AT31873 01 E L1 2 Coil Assembly AT32402 02 AB L8...

Page 88: ...ACITORS Description Part No Remarks Code Band 2n2 10 100V cer plate PN99812 ABE C2 4 10µ 20 15 16V elect PS99505 ABE C1 3 RESISTORS Ohms 12 PM01413 AB R2 15 5 0 25W c film PM01414 E R2 330 PM01430 E R1 3 470 PM01432 AB R1 3 4k7 20 0 1W carbon PL03370 AE RV1 Linear Potentiometer THICK FILM CIRCUITS MS438BGY PA Sub Module FU00109 E TF1 Item 17 Contains MS438BGY PA Sub Module FU07518 A TF1 Beryllium ...

Page 89: ...APACITORS 2p2 10p 18p 5 33p 2n2 10 100V 10n 20 80 500V cer tub cer tub cer disc PN01074 C2 PN09047 C4 6 PN10137 C1 7 PN12111 C3 5 PN99812 C8 9 10 AT27750 only PN99612 C8 9 10 AT27889 only MISCELLANEOUS Antenna Changeover Relay FR21000 R LA Diode HG1012 FV05818 D1 MECHANICAL ITEMS Printed Wire Board Assembly AT13216 AT27889 only Printed Wire Board Assembly AT12896 AT27750 only Screen BT26212 Solder...

Page 90: ...20 15 16V tant r d PS99507 C1 5 15001 16V elec PS99527 C10 Not used C3 4 RESISTORS 100 5 PL99757 R4 330 PM01424 R1 330 5 0 25W c film PM01442 R2 3k3 PM01442 R3 INDUCTORS 0 J22 Choke FT99000 L3 1µ5 Choke FT99002 L1 2 MECHANICAL ITEMS Printed Wire Board Assembly AT13055 Screen BT26254 Spring Contact BT26997 Screen Screw Pan Taptite M3 x 8 mm QJ11551 X1 10 Fixing screws Not part of AT27796 CONTROL IN...

Page 91: ...Fig 5 1 Exploded Diagram ...

Page 92: ... 6 7 B 9 10 II 12 13 14 15 16 1 R3 1 POWER 9 6 COMPONENT SIDE ON OFF SWITCH RESET LOCK 2 DEFEAT SWITCH 3 13 4 5 5 1 111 12 t 17_ 11 z IC 9 8 C1G 7 DE S 58 3 2 C17 LI 1 1C91 2 3 4 5 6 7 8 S 10 a_ 16 15 El 15 c C SKJ ANTENNA SOCKET CB MI ft C6 I I 6 5 2 I I 5 AT 27651 OSCILLATOR MULTIPLIER AT 27652 12 CHANNEL OSCILLATOR A127637 REGULA TO R 6 7 2 2 13 I2 Il IT IS 9 P2 7 21 t T 25 6 25 5 4 2 3 27 28 2...

Page 93: ...7 15 PIN 7 1113 262 R6 00 7 C40 Li C42 962 410 1006 COO 2 2 TRI6 PBC108 In 3 2 TRI3 2N5447 044 106 PLI PIN 4 PLL PIN 5 PLL PIN 10 TH1 PIN 6 a PBC108 6 TR14 15 R53 231 2N545I3 0 7006 I 88p R5 r1 1181 0 7 8 R57 7517 15K TRIO TR9 26 03 PBC IPBC GD25 46 1 0 8 08 R32 935 C20 C22 ER36 R37 R39 10K T I 3K3 12 2 _ 1 470r i 336 10K 262 R45 24 16 TR1 2 2706 PBC108 C32 I 15 22K PI MIMS 47n 1 226_ 056 R59 R47 ...

Page 94: ...L1 L2 L3 I A2 17 TR1 BF2 55LB CI L7 C29 C44 2p2 TR2 13F2S6LB 61L3 I 1 L9 ANT 1C3 276 PA MODULE T F I Ve Ve TR6 TR ZTX 310L 2N3866 TR5 ZTX310L C11 15 21 C37 I I T C3B C35 C36 1C39 LO T T T TN3 866 II In 104 RIO R7 cc C2 C6 I I 2p2 T1 8 I I 70 8 10 2 6 4 R8 R9 C45 c131 14 00 K 100K DI C4 r MV mon 840 L2 R14 FR15 D3 a R18 680 680 ITT 3103 1012 2 1R K 2 2 3 I 00 R25I C19 T T 1 4n7 20C23 L6 R27I 0 2 8 ...

Page 95: ...6 8 _ 9_ 0 I T5 9 d TR2s _I 11 12 1 9 13 14 TR1 R 1 C28 ti II 1 1 C16 72 Lt I C15 5 Lt v _ f ei z _ X6 C7 lcs 1 1 L6 c L5 Iu I L4 T 1 1 L3 0 1 1 L2 L 2 L8 cr T 1 I L _I 54L L7 MEI loll I C3 1 C26 C22 C29 I cn i li 1 705 1 s g 2 sc T 1 C21 s C17 I C13 C9 I Cl DiUNDERSIDE F21UNDERSIDE E COMPONENT SIDE NOTE WHEN ONE CONDUCTOR LAYER OF A DOUBLE SIDED BOARD IS USED AS A GROUND OR SCREEN IT IS OMITTED T...

Page 96: ... 1 L9 IN L 1 rJ 1 I I I C341 1 3 7 J L L_ R2 H 1 R I 3 1 2 C C4 f1i C3 C1 RI 2 3 4 II I 5 I VI L3 L2 LI CC I I XL1 I I R8 1 ir T 1 I R6 Rg R5 D2 1 4 R2 H CHANNELS 2 TO11 TF1 C39 T C2 F ffC31 1R30 C8 C26 C9 C8 01 1C45 z g 1Rib1 T2 T 44j C19 C27 T T 3 C D 1 211 El f CIO C40 I 2 4 6 7 8 9 6 7 8 1 2 5 3 4 5 10 11 12 13 14 15 16 17 C4 15 MP12 150mV r m s MP13 18W 6 C40 2 1 C3V1 C27 g re 1232L C31 7 7 8...

Page 97: ...AUDIO rt to L2 1 1 7 LI 2p2 I 58 1 MP5 C 150mV r rn s SKE 12 PIN 8 I C6 A 1 2 4n7 I RX OSCILLATOR MULTIPLIER AT 27651 MULTI CHANNEL RX OSCILLATOR AT27652 4 F C 3 12 B I CS IC6 c4 13 C OSC TF1 0 14 WAY INTERCON BOARD AT13099 rrit r r 4 5 8 9 11 13 7 10 3 6 12 2 1 T IS 5 E CI MP6 V r ms LK1 IN FOR SINGLE CHANNEL ONLY FU00537 0 1 Ve C21 C23 14 PINS 1 14 ON MAIN MOTHER BOARD G 1 22 1 H I 23 I C12 C13 ...

Page 98: ...01 11 1E IN 4001 PLOF9 K0 8 G IJ 11 N 9 V 7 R D 6 P ID 5 J I ID 4 19 0 3 M I ID 0 3 M 2 B INS 1 E I ID CI 02 CI Ti 100 Il 1 47 0 1o 1 1 0 1 1 74145 2 IC2 R 0 I 2 12 PL N I SON 8 7412A o I I T 6 1 5 I D 6 5 I ID 7 1 4 H L O 5 LI N D 6J L MOTHER 804R0 2 21 5NL TX EXCITER AT27639 OR AT27881 FIG 6 8 M254 M256 TRANSMITTER EXCITER A B BANDS C10 C12 1 4n7 4n7 11 T11 5 T TO R16 100 C17 C24 C25 R17 n L3 4n...

Page 99: ...L SWITCH DEFEAT LOCK RESET RV2 S 1W SK I VOLUME I LOG S31b ON OFF HANDSET CONTROL PANEL ASSEMBLY AT14126 1 DEFEAT SWITCH CALL LAMP AT14126 2 SI SKA PLA PRESS TO TALK A Di N I GI EAR PIECE LP1 ON LP2 CALL TX FRONT BACK 11 RN Ns r r 20 25 U 15 20 25 1 L L aU M _ FIG 6 9 FRONT MOUNT CONTROL PANEL ...

Search results

Summary of Contents for Beaver M254

Reviews:

Related manuals for Beaver M254

Brands by name

Popular brands

PYE Beaver M254, Service Manual

Search results

Summary of Contents for Beaver M254

Reviews:

Related manuals for Beaver M254

Brands by name

Popular brands