Maxon SP-300 Series Service Manual
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Maxon SP-300 Series Service Manual

Midland radio service manual sp-300 radio receiver
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SERVICE
MANUAL
Maxon America, Inc. 10828 N.W. Airworld Dr. Kansas City, MO 64153 Tel: 816-891-6320 Fax: 816-891-8815
Part Number: 680-100-0155
April 2001

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  • Page 1 SERVICE MANUAL Maxon America, Inc. 10828 N.W. Airworld Dr. Kansas City, MO 64153 Tel: 816-891-6320 Fax: 816-891-8815 Part Number: 680-100-0155 April 2001...

  • Page 2: Table Of Contents

    SP-300 SERIES UHF & VHF DIGITAL SECTION PARTS LIST ..29 SP-300 SERIES VHF RF SECTION PARTS LIST ..... . 31 SP-300 SERIES UHF RF SECTION PARTS LIST .
  • Page 3 MAXON SP-300 HAND HELD Board Layout ........... 48 Exploded View.

  • Page 4: Temperature Range

    1350 mAh ..........9 Hrs @ 5 W SP-300 HAND HELD...

  • Page 5: Frequency Bands

    Radio ........
  • Page 6 12.5 kHz ..........< 40 dB SP-300 HAND HELD and suitable antenna VHF: <...
  • Page 7 MAXON SP-300 HAND HELD RX TONE DEMODULATION CHARACTERISTICS SUBAUDIO TONES - CTCSS Tone Range ......... . . 67 Hz to 250.3 Hz Non-Standard Tones .

  • Page 8: Introduction

    INTRODUCTION SP-300 The SP-300 Series of portable radios from Maxon, utilizes the latest technology in its design and manufacturing. Both the VHF and UHF models are PLL (Phase Lock Loop Syn- thesizer) / microprocessor controlled, and offer 1 or 5 watts of power with 4 &...

  • Page 9: Busy Channel Lockout

    The radio will beep 4 times when the TOT time expires. After the TX inhibit time passes, the radio will beep one final time. Page -6- May 2001...

  • Page 10: Low Battery Indication

    Memory Protect The software is such that if the radio is inadvertently put into program mode it will not lose the contents of the EEPROM memory. Data will only move in and out of the memory when the programmer is attached.

  • Page 11: Description Of Controls

    The controls, indicators and antenna connections on the VHF and UHF Scanning Handheld Series radios are all located on the top panel. The accessories socket is located on the radio chassis right hand side. The monitor and PTT buttons are located on the radio chassis left hand side.

  • Page 12: Theory Of Operation

    Pin 14 (IC411). The filtered encode signal is fed to IC406B and RV403 (sub-audible gain control), the output of IC406B is then fed to the audio mixer circuit. SP-300 HAND HELD External Mic/PTT Control Circuit The external microphone is connected via the CON701 con- nector on the right side of the handheld.

  • Page 13: Rf Circuits

    MAXON SP-300 HAND HELD Mute (squelch) Circuit The mute circuit which is controlled by the output of IC409 (micro) Pin 77 (386EN) is connected to Q34 via R122 which mutes the LM386IC on the RF circuits. Pin 77 also controls IC402B which mutes the audio path to the RF circuits.

  • Page 14: Rf Circuits Pll Synthesizer

    (2-11v). L203/L303 are resonant coil, which changes the control voltage by the tuning core. D202 modu- lation diode, modulates the audio signal. C204 compensate SP-300 HAND HELD for the non-linearity of the vco due to modulation diode, and maintain a constant modulation regardless of frequency.

  • Page 15: Noise Detector

    MAXON SP-300 HAND HELD filters provide the adjacent channel selectivity of 25 kHz or 12.5 kHz bandwidth. Squelch (mute) Circuit The squelch circuit switches off the power amplifier when no audio signal is present. The squelch circuit consists of a 16 kHz band pass filter and a noise detector circuit.

  • Page 16: Maintenance And Repair

    1. With the slides of the belt clip positioned in line with the belt clip guide rails, slide the belt clip into posi- tion until a click is heard. SP-300 HAND HELD Figure 1-Belt Clip Removal Figure 2-Belt Clip Installation...

  • Page 17: Removing & Replacing The Battery

    To replace the battery: 1. Position the battery on the battery guide rail at the bottom of the radio. 2. Move the top of the battery toward the radio until a click is heard. REMOVING & REPLACING PTT ASSY. To remove the PTT assembly: 1.

  • Page 18: Removing & Replacing The Accessory Connector

    To replace the Control Knobs: 1. Reverse the steps taken to remove the Control Knobs. SP-300 HAND HELD Figure 5-PTT Installation Figure 6-A/C Removal & Installation Figure 7-Control Knob Removal & Installation...

  • Page 19: Removing & Replacing The

    MAXON SP-300 HAND HELD REMOVING & REPLACING THE BACK COVER To remove the Back Cover: 1. Remove battery. (Refer to Removing &Replacing the Battery) 2. Unscrew the four Back Cover mounting screws located on the Back Cover of the radio.

  • Page 20: Removing & Replacing The Main Board

    Note: It is not necessary to remove the stud mount antenna jack from the radio. 11. Remove the Speaker wire connector from the Main Board connector. SP-300 HAND HELD Figure 9-Main Board Removal & Installation Figure 9A-Main Board Removal & Installation Figure 9B-Main Board Removal & Installation...
  • Page 21 MAXON SP-300 HAND HELD To replace the Main Board 1. Reverse the steps taken to remove the Main Board. 2. When installing the Main Board into the chassis insure that the LED light guide is aligned properly. 3. When installing the Main Board into the chassis,...

  • Page 22: Removing & Replacing The Daughter Boards

    3. When the solder on all terminals is liquefied, gently remove the component. Excessive force may cause the PCB pads to separate from the board if all sol- der is not completely liquefied. Page -19- May 2001 MAXON SP-300 HAND HELD...

  • Page 23: Surface Mount Component Replacement

    MAXON SP-300 HAND HELD 4. It may be necessary to remove excess solder using a vacuum de-soldering tool or Solder wick . Again, use great care when de-soldering or soldering on the printed circuit boards. It may also be necessary...

  • Page 24: Programming

    8. For cloning other radios, repeat steps 3 through 7. SP-300 HAND HELD ALIGNMENT PROCEDURE The SP-300 U/V Receiver is by design, broad band, cover- ing UHF(440 to 470 MHz) and VHF(148-174MHz) and should require no special alignment, unless repairs are per- formed on the receiver portion.
  • Page 25 MAXON SP-300 HAND HELD 15. Disconnect the test equipment. Should repairs be required, the following procedures should be applied: RX VCO 1. Set the unit to the highest receive frequency, 470 MHz(UHF), 174MHz(VHF) and adjust the VCO L303 to 10 volts.

  • Page 26: Test Equipment Setup

    TEST EQUIPMENT SETUP AUDIO GENERATOR RADIO DC POWER SUPPLY RADIO DC POWER SUPPLY 1. S.S.G. : @ 1kHz Audio: SP-300 HAND HELD WATT METER 20dB AUDIO MODULATION- METER OSCILLOSCOPE SPECTRUM ANALYZER 154.625445681125661 FREQUENCY COUNTER VOLT METER 3K Dev @ 1K (25 kHz Channel Spacing) 1.5K Dev @ 1K (12.5 kHz Channel Spacing)

  • Page 27: Alignment Points Diagram

    MAXON SP-300 HAND HELD ALIGNMENT POINTS DIAGRAM TC701 L203 RV401 RV402 ALIGNMENT POINTS VHF & UHF WITH TCXO MODULE TCXO1 L303 RV403 ALIGNMENT POINTS UHF WITH Page -24- May 2001 L203 L303 RV401 RV403 RV402 OUT TCXO MODULE...

  • Page 28: Troubleshooting Guide

    2. Check Q501,502,503 3. Check Q22,D4 1. Check mic 2. Check IC411, 410, 405, 401,404 1. Check IC406,407,411 2. Re-adjust RV403 1. Check 6v on Q412, 413 2. Defective programming lead Page -25- May 2001 MAXON SP-300 HAND HELD COUNTER MEASURES...

  • Page 29: Control Circuit

    MAXON SP-300 HAND HELD CONTROL CIRCUIT REF # Q401 Q403 Q404 Q405 Q406 Q407 Q408 Q410 Q411 Q412 Q413 NOTE: Q402 and Q409 are not fitted on this model series. MAIN CIRCUIT REF # 18.0 18.0 ~3.0 NOISE NOTE: Q9, 10, 15, 19, 20, 23 and 28 - 32 are not fitted on this model series.

  • Page 30: Receive State

    NOTE: IC4, 403 and 405 are not fitted on this model series. IC401 AUDIO AUDIO IC407 IC408 IC410 IC411 AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO Page -27- May 2001 MAXON SP-300 HAND HELD IC402 AUDIO...

  • Page 31: Transmit State

    MAXON SP-300 HAND HELD TRANSMIT STATE PIN # 1.6M PIN # IC404 IC406 AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO IC401 IC407 IC408 IC410 IC411 AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO...

  • Page 32: Sp-300 Series Uhf & Vhf Digital Section Parts List

    SP-300 SERIES UHF & VHF DIGITAL SECTION PARTS LIST REF# DESCRIPTION DIGITAL SECTION VHF& UHF (COMMON PARTS) PTT SWITCH BOARD (SEE NOTE1) FUSE BOARD ASSY C136 CAP,TA,100UF 293D107X0006E2T6V C400 CAP,CER,0.0068UF,50V,5%,X7R,1/16W,0603 C404 CAP,CER,.047UF,0603, C405 CAP,CER,0.001UF,10%,50V,X7R,0603 C406 CAP,CER,0.1UF,+80-20%,25V,Y5V,0603 C413 CAP,CER,470PF,10%,50V,X7R,0603 C414 CAP,CER,470PF,10%,50V,X7R,0603...
  • Page 33 MAXON SP-300 HAND HELD REF# DESCRIPTION Q413 TRANS,BRT,NPN,KRC104S,SOT-23,SW,ND Q416 TRANS,BRT,PNP,KRA110SPK,SOT-23,SW,PK Q417 TRANS,PNP,KTA1504(Y),SOT-23,SW Q701 FET, 2SK 1579-TMOS Q702 TRANS,,NPN,KTC3875S(BL) RES,TF,68,5%,1/10W,TC250,0805 RES,TF,68,5%,1/10W,TC250,0805 R100 RES,TF,470,5%,1/16W,TC250,0603 R200 RES,1.2K 1/16W5%T1608 R400 RES, 9.1K 1/16W 5% T 1608 R401 RES,TF,680K, 5%, 1/16W, +/-200, 0603 R402 RES,8.2K,1/16W,5%,T 1608 R403 RES,8.2K,1/16W,5%,T 1608...

  • Page 34: Sp-300 Series Vhf Rf Section Parts List

    SP-300 SERIES VHF RF SECTION PARTS LIST REF # DESCRIPTION REPLACEMENT MODULES FRONT ENDASSY, VHF(SEE NOTE 1) VCOTX/RX ASSY, VHF (SEE NOTE 1) POWERAMPASSY, VHF(SEE NOTE 1) TCXO ASSY, VHF(SEE NOTE 1) COMPONENTS CAP,CER,0.001UF,10%,50V,X7R,0603 CAP,TA,10UF,293D106X06R3A2T6.3V CAP,CER,0.001UF,10%,50V,X7R,0603 CAP,CER,0.001UF,10%,50V,X7R,0603 CAP,CER,470PF,10%,50V,X7R,0603 CAP,TA,4.7UF,20%,10V,3216 CAP,CER,0.001UF,10%,50V,X7R,0603 CAP,CER,470PF,10%,50V,X7R,0603 CAP,CER,0.001UF,10%,50V,X7R,0603...
  • Page 35 MAXON SP-300 HAND HELD REF # DESCRIPTION C128 CAP,TA,10UF,20%,16V,3216 C129 CAP,ELE,10UF,16V20%3X5 5.0PT C131 CAP,CER,0.01UF,5%,50V,X7R,0603 C132 CAP,TA,4.7UF,20V,3528:293D475X0020B2T20V C133 CAP,TA,1.0UF,20%,16V,3216 C134 CAP, CER,.047UF,0603, C135 CAP, TA,10UF, 293D106X0004A2T4V C136 CAP, TA, 100UF, 20%, 6.3V, D C137 CAP, CER,470PF,10%,50V,X7R,0603 C145 CAP, CER,470PF,10%,50V,X7R,0603 C146 CAP, CER,220PF,5%,50V,COG,0603 C901 CAP, CER, 0.01UF,5%,50V,X7R,0603...
  • Page 36 741-102-1101 TRANSFORMERSCHIP 617PT-1019 741-102-1220 TRANSFORMERSCHIP 617PT-1019 741-102-1471 THERM,33K,NTCCS32163SH333KC 741-102-1272 POT,20K,RK097111120KA 741-102-1000 CRYSTAL,44.645M-3015PM,32P,RX 3RD,HC-45 168-044-6450 741-102-1102 FILTER,CRYSTAL,KFN1045AA(45.1M) (BMO-U) Page -33- May 2001 MAXON SP-300 HAND HELD PART # 741-102-1823 741-102-1393 741-102-1100 741-102-1103 741-102-1104 741-102-1223 741-102-1103 741-102-1103 741-102-1303 741-102-1223 741-102-1563 740-521-0R10 741-102-1271...

  • Page 37: Sp-300 Series Uhf Rf Section Parts List

    MAXON SP-300 HAND HELD SP-300 SERIES UHF RF SECTION PARTS LIST REF # DESCRIPTION REPLACEMENT MODULES FRONT ENDASSY, UHF (SEE NOTE 1) VCOTX/RX ASSY, UHF (SEE NOTE 1) POWERAMPASSY, UHF (SEE NOTE 1) COMPONENTS CAP,CER,470PF,10%,50V,X7R,0603 CAP,TA,10UF,293D106X06R3A2T6.3V CAP,CER,470PF,10%,50V,X7R,0603 CAP,CER,470PF,10%,50V,X7R,0603 CAP,CER,470PF,10%,50V,X7R,0603 CAP,TA,4.7UF,20%,10V,3216...
  • Page 38 350-000-0103 RES,TF,100,5%,1/16W,TC250,0603 371-004-31R2 RES,910,1/10W,5%,T 2012 350-000-0103 RES,TF,12K,5%,1/16W, +/-200,0603 371-804-3R47 RES,TF,10K,5%,1/16W, +/-200,0603 RES,33,1/16W5%T 1608 RES,TF,4.7K,5%,1/16W,TC250,0603 RES,TF,100,5%,1/16W,TC250,0603 RES,5.6K,1/16W,5%,T 1608 Page -35- May 2001 MAXON SP-300 HAND HELD PART # 371-004-3R15 370-013-4102 370-013-4102 371-017-3102 371-005-3103 870-010-0007 870-010-0010 870-010-0010 870-010-0010 870-010-0005 870-200-0006 870-100-0004 870-100-0004...
  • Page 39 MAXON SP-300 HAND HELD REF # DESCRIPTION RES,TF,4.7K,5%,1/16W,TC250,0603 RES,TF,18,1/16W, 5%,T 1608 RES,TF,4.7K,5%,1/16W,TC250,0603 RES,TF,220,1/16W,5%,T 1608 RES,TF,300,1/16W,5%,T 1608 RES,TF,300,1/16W,5%,T 1608 RES,TF,6.8K,5%,1/16W,+/-200,0603 RES,TF,18,1/16W, 5%,T 1608 RES,5.6K,1/16W,5%,T 1608 RES,1.2K 1/16W5%T1608 RES,TF,22,1/16W,5%,T 1608 RES,TF,12K,5%,1/16W, +/-200,0603 RES,TF,10K,5%,1/16W, +/-200,0603 RES,TF,22K,5%,1/16W,TC250,0603 RES,TF,2.2,5%,1/10W,TC250,0805 RES,TF,2.2,5%,1/10W,TC250,0805 RES,TF,1M,5%,1/16W,+/-200,0603 RES,TF,2.2,5%,1/10W,TC250,0805 RES,TF,3.3K,5%,1/16W,TC250,0603 RES,TF,10K,5%,1/16W, +/-200,0603 RES,TF,1K,5%,1/16W,+/-200,0603 RES,1.2K 1/16W5%T1608...
  • Page 40 IC, OP AMP,LM358M,SO-8,DUAL OP AMP IC, AUDIO AMP,LM386M-1,0.33W,SO-8 IC, OP AMP,LM358M,SO-8,DUAL OP AMP POT, 20K,RK0971111 20KA CRYSTAL, 44.645M -30 15PM,32P,RX 3RD,HC-45 168-044-6450 FILTER, CRYSTAL,KFN1045AA(45.1M) (BMO-U) 310-030-0015 PART# 150-000-0003 700-050-0002 441-030-0006 441-040-0002 441-030-0006 901-002-0203 Page -37- May 2001 MAXON SP-300 HAND HELD...

  • Page 41: Component Pinout

    MAXON SP-300 HAND HELD BASE DIAGRAM 2SC5084 MMBR951 BFR92A KTC3875S (BL) KTA1504SY KRC104S (ND) KRA104S (PD) KRA101S (PA) KRA110S (NK) KRA102S (PB) MMBZ5232B KDS181 (A3) KDS193 (F3) KDS226 (C3) KDS184 (B3) UPP9401 COMPONENT PINOUT MANUFACTURER'S REFERENCE NO. PART NUMBER Q202,203,302,303,601...
  • Page 42 MANUFACTURER'S BASE DIAGRAM PART NUMBER ND433G 1.BASE 2.COLLECTOR KTA1663 3.EMITTER 1.EMITTER 2.BASE BLT50 3.EMITTER 4.COLLECTOR 1,4,5,8:EMITTER BLT52 2,3:BASE 6,7:COLLECTOR 1SV229 SM4004 HD4074818 SP-300 HAND HELD REFERENCE NO. Q502 Q503 D201,202,301 IC409 Page -39- May 2001 MAXON SCHEMATIC CPU IC...
  • Page 43 MAXON SP-300 HAND HELD BASE DIAGRAM RF Power Amp RX Front-End (VHF) Front-End Assy. P/N: 650-110-0012 (UHF) Front-End Assy. P/N: 650-110-0013 RX/TX VCO TOP SIDE (VHF) V.C.O. Assy. P/N: 650-030-0021 (UHF) V.C.O. Assy. P/N: 650-030-0020 12.8 MHz TCXO (VHF ONLY) TCXO Assy. P/N: 650-100-0002...

  • Page 44: Schematics & Block Diagram

    C605 C608 0.001 33pF R602 R601 6.8K C601 C603 L601 680pF 56pF R603 Q601 C611 L602 L603 100pF MMBR951 C604 C602 C606 C607 R604 39pF 100pF 39pF C612 120pF R605 47pF 3.3K Notes: VHF FRONT-END VALUES OHMS, MICROHENRIES OR MICROFAR- (148-174MHz Band Shown) ADS UNLESS OTHERWISE SPECI- FIED.

  • Page 45: Vhf V.c.o

    VCO TX L205 C212 R205 180nH 0.001 2.2K Q203 2SC5084 C213 4.7P R204 2.2K R206 Q202 C208 C202 2SC5084 L201 4.7P 1.2uH C214 C205 R202 1.2P 100K L204 C203 D202 2.2UH 1.2P 1SV217 L203 R203 C201 C206 4.5t 4.7K 0.001 2.7P R207 C204...

  • Page 46: P.t.t

    R706 TH703 TH701 150K R710 R708 2.2K D702 MMBV109 D701 MMBV X701 R702 12.8MHz LK701 R704 R705 R707 R701 R703 C702 C703 100pF 91pF R709 R711 TH702 C701 4.7K TC701 100pF 20pF TCXO Schematic P/N: 770-100-0002 Rev. D PCB Assy. P/N: 650-100-0002 Rev. D CON401 4PIN(M) SW401...

  • Page 47: Digital Schematic

    BCD ENCODE SW 4/16CH C481 C482 C480 C479 470P 470P 470P 470P REVISIONS DESCRIPTION DESCRIPTION RELEASED TO MANUFACTURING 5/01 1.DATA 2.CLOCK 4.+7.5V 7.GND 8.MIC+ 10.INT_SPK_MIC_DSBL 11.SPKR+ CON701 12 HEADER TITLE SP-300 Series Digital Schematic Diagram DOCUMENT SIZE NUMBER SCALE SHEET...

  • Page 48: Vhf Rf Schematic

    TX 5V KTC3875S (ALL) 3.3K KDS160 VCO TX SECTION 0.001 8.2K (VHF) P/N: 650-030-0021 MMBC1321 4.7K 470P 470P PRE OUT KTC3875S (ALL) 3.3K KDS160 5.6K 1.2uH 4.7/10(T) VCO RX SECTION BFR92A (P2) 470P 4.7K 220P SWB+ C907 C903 C910 C911 R901 R904 R906...

  • Page 49: Uhf Rf Schematic

    KTC3875S(ALL) 1.2K VCO TX SECTION KDS160 5.6K (UHF) P/N: 650-030-0020 470P 4.7K 220P PRE OUT KTC3875S(ALL) 4.7K KDS160 4.7/10(T) STREENG VCO RX SECTION 220P 4.7K 220P C903 C911 C907 R906 R908 C910 R904 Q901 R901 0.01 0.01 D901 0.01 7.5K 2.2K 7.5K KTC4075...

  • Page 50: Block Diagram

    SQ IN INPUT MUTE AF OUT FIL IN FIL OUT FAST INTEGRATER NOISE AMP AF LEVEL LM386 AUDIO AMP REVISIONS DESCRIPTION DESCRIPTION 03/01 TITLE SP-300 Series SYSTEM ELECTRICAL BLOCK DIAGRAM DOCUMENT SIZE 060-***-**** NUMBER SCALE SHEET PAGE -47- May 2001...

  • Page 51: Pcb Layouts

    C132 CH404 FON1 FRONT END MODULE D407 MODULE C428 C426 C145 RV401 R459 C146 C433 C471 C463 R452 Q402 R451 C465 R453 C470 C464 R441 R407 IC410 IC409 IC407 C449 R412 Board Layout (Top) Main Board Assembly 416121B PAGE -48- May 2001 PCB LAYOUTS LED1...
  • Page 52 PROTECTION SHEET ANTENNA STUD KIT PA MODULE (VHF) PA MODULE (UHF) BRACKET INSULATION PLATE SPACER(CH SW MTG) P.C.B MAIN (SP-300) P.C.B MAIN (SP-310) P.C.B MAIN (SP-320) P.C.B MAIN (SP-330) VCO MODULE (VHF) VCO MODULE (UHF) TCXO MODULE FRONT END MODULE (VHF)

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