Midland Radio SP-300 manuals
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When we buy new device such as Midland Radio SP-300 we often through away most of the documentation but the warranty.
Very often issues with Midland Radio SP-300 begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Radio Midland Radio SP-300 is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Radio on our side using links below.
Midland Radio SP-300 Service Manual
52 pages 3.44 Mb
2 TABLE OF CONTENTS4 SPECIFICATIONSGENERAL TEMPERATURE RANGE CURRENT CONSUMPTION 6 RECEIVER8 SP-300 Series HAND HELDINTRODUCTION FEATURESMain Features Wideband Scan Mode Scan Channel Delete 9 Scan Delay TimeBusy Channel Lockout Marked Idle Enable Normal/Inverted DCS Standard/Non-Standard CTCSS Transmit Time-Out-Timer (TOT)/TX Inhibit 10 SP-300 Series HAND HELDVCO Lock Time Low Battery Indication Memory Protect External Option Detect 11 maxonDESCRIPTION OF CONTROLS 12 THEORY OF OPERATION16 MAINTENANCE AND REPAIR22 COMPONENT REPLACEMENT24 PROGRAMMINGALIGNMENT PROCEDURE 26 TEST EQUIPMENT SETUP1. S.S.G. : @ 1kHz Audio: 27 ALIGNMENT POINTS DIAGRAMALIGNMENT POINTS VHF & UHF WITH TCXO MODULE ALIGNMENT POINTS UHF WITH OUT TCXO MODULE 28 TROUBLESHOOTING GUIDE29 VOLTAGE CHARTSCONTROL CIRCUIT MAIN CIRCUITRX TXREF # B C E B C E Page -27- 30 SP-300 HAND HELDRECEIVE STATE 31 TRANSMIT STATE32 SP-300 SERIES UHF & VHF DIGITAL SECTION PARTS LIST34 SP-300 SERIES VHF RF SECTION PARTS LIST37 SP-300 SERIES UHF RF SECTION PARTS LIST41 COMPONENT PINOUTMMBR951 Q16,17,501,601 KRA104S (PD) Q5,410,412 KRA102S (PB) Q1 D405, 406, 407 KDS226 (C3) D601,901,902 42 Page -39-REFERENCE NO. SCHEMATIC D15 D201,202,301 43 Page -40-PIN DESCRIPTION 1 12 15 RX/TX VCO Out 5 GND BASE DIAGRAM Input 2 Vcc (Final) No Description 2 1 Modulation RF Power Amp PAGE -41- 44 SCHEMATICS & BLOCK DIAGRAMues may differ from schematics shown. VHF FRONT-ENDSchematic P/N: 770-110-0012 Rev. C PCB Assy. P/N: 650-110-0012 Rev C VHF POWER AMPSchematic P/N: 770-230-0012 Rev. A PCB Assy. P/N: 650-230-0012 Rev. A UHF POWER AMP(440-470MHz Band Shown) Schematic P/N: 770-230-0013 Rev. B PCB Assy. P/N: 650-230-0013 Rev. B UHF FRONT-END(440-470MHz Band Shown) Schematic P/N: 770-110-0013 Rev. D PCB Assy. P/N: 650-110-0013 Rev. D z N VHF V.C.O.Schematic P/N: 770-030-0021 Rev. B PCB Assy. P/N: 650-030-0021Rev. B UHF V.C.O.(440-470MHz Band Shown) Schematic P/N: 770-030-0018 Rev. D PCB Assy. P/N: 650-030-0020 Rev. A 45 VCO TXVCO R X97 10 8 13 11 14 15 3 VCO TX VCO RX97 12 10 11 13 14 16 3 15 17 PAGE -43- TCXO Schematic P/N: 770-100-0002 Rev. D PCB Assy. P/N: 650-100-0002 Rev. D ACC-200 BATTERYSchematic P/N: 770-210-0010 Shown for reference only FUSESchematic P/N: 770-200-0004 Rev. B PCB Assy. P/N: 650-200-0004 Rev. B P.T. T.Schematic P/N: 770-180-0017 Rev. A PCB Assy. P/N: 480-042-0028 46 -3 1 47K MMBR9426 R710 C705 R713 C703 D702 2 R709 R712 R715 BATT 7.5V +47 PAGE -44- May 2001 Digital SchematicPTT SCHEMATIC P/N:480-042-0028DESCRIPTIONDESCRIPTIONREVARELEASED TO MANUFACTURING DGC 5/01 SP-300 Series Digital Schematic Diagram PAGE -45- 48 VHF RF SchematicAUDIO AMP DESCRIPTIONDESCRIPTIONREV VCO RX SECTION FUSE SCHEMATIC P/N: 650-200-0004 NICAD BATTERY 7.5V P/N: 650-210-0010 ++ - SP-310, SP-330 VHF RF SCHEMATICVCO TX SECTION (VHF) P/N: 650-030-0021 P.A. MODULE(VHF) SCHEMATIC P/N: 650-030-0012 FRONT-END (VHF) SCHEMATIC P/N: 650-110-0012 49 PAGE -46- May 2001 UHF RF SchematicP.A. MODULE(UHF) SCHEMATIC P/N: 650-230-0013 VCO TX SECTION (UHF) P/N: 650-030-0020 VCO RX SECTION FRONT-END (UHF) SCHEMATIC P/N: 650-110-0013 FUSE SCHEMATIC P/N: 650-200-0004 NICAD BATTERY 7.5V P/N: 650-210-0010 ++ -DESCRIPTIONDESCRIPTION RELEASED TO MANUFACTURING REV A SP-320 / SP-340 UHF RF SCHEMATIC PAGE -47- 50 Block DiagramREVISIONS NADESCRIPTIONDESCRIPTION RELEASED TO MANUFACTURING REV A SP-300 Series SYSTEM ELECTRICAL BLOCK DIAGRAM 060-***-**** PAGE -48- 51 PCB LAYOUTSTCXO1 VR3 J3 Board Layout (Top) Main Board Assembly 416121B Board Layout (Bottom) Main Board Assembly 416121B Board LayoutCH404 FON1 FRONT END TCXO VCO PA PAGE -49- 52 Exploded ViewSEE NOTE 3 SEE NOTE 1 SEE NOTE 2
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