Midland Radio SP-300 service manual 37- May

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MAXON

SP-300 HAND HELD

REF#	DESCRIPTION	PART#
TCXO	TCXO, KXN1343A,12.8M,2.0PPM	150-000-0003
TH1	THERM,33K,NTCCS32163SH333KC	700-050-0002
U3	IC, OP AMP,LM358M,SO-8,DUAL OP AMP	441-030-0006
U6	IC, AUDIO AMP,LM386M-1,0.33W,SO-8	441-040-0002
U8	IC, OP AMP,LM358M,SO-8,DUAL OP AMP	441-030-0006
VR3	POT, 20K,RK0971111 20KA	901-002-0203
X1	CRYSTAL, 44.645M -30 15PM,32P,RX 3RD,HC-45 168-044-6450
XF1	FILTER, CRYSTAL,KFN1045AA(45.1M) (BMO-U)	310-030-0015

Page -37- May 2001

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Contents Service Manual Table of Contents Board Layout Exploded View Specifications Temperature RangeGeneral Current ConsumptionDimensions WeightAdjacent Channel Power Frequency BandsReceiver Peak Deviation @ 1 kHz Nom. Dev +20dBRX Tone Demodulation Characteristics Features SP-300INTRODUCTIONBusy Channel Lockout VCO Lock Time Description of Controls DescriptionTheory of Operation Digital CircuitsRF Circuits RF Circuits PLL Synthesizer Squelch mute Circuit KHz Band Pass FilterNoise Detector Speaker Audio AmplifierMaintenance and Repair Removing & Replacing the Belt ClipRemoving the belt clip To replace the belt clipRemoving & Replacing the Battery To remove the batteryTo replace the battery To remove the PTT assemblyRemoving & Replacing the ACCES- Sory Connector Removing & Replacing the Antenna & Control KnobsTo remove the Back Cover Removing & Replacing the Back CoverTo replace the Back Cover Removing & Replacing the Main Board To remove the Main BoardTo replace the Main Board Removing & Replacing the DAUGH- TER Boards Component ReplacementRemoving & Replacing the Speaker Surface Mount Component Replacement Surface Mounted Integrated Circuit ReplacementProgramming Alignment ProcedureCloning RX VCO Test Equipment Setup S.G. @ 1kHz AudioAlignment Points Diagram TP1Troubleshooting Guide Symptoms Causes Counter MeasuresVoltage Charts Main CircuitReceive State Transmit State SP-300 Series UHF & VHF Digital Section Parts List REF# Description PART#-30- May SP-300 Series VHF RF Section Parts List REF # Description Replacement Modules-32- May -33- May SP-300 Series UHF RF Section Parts List -35- May -36- May -37- May Component Pinout KTA1504SY-39- May Base Diagram PIN Description VHF Power AMP UHF Power AMPVHF FRONT-END UHF FRONT-ENDVHF V.C.O UHF V.C.OTcxo ACC-200 BatteryFuse SP-300 Series VHF RF Schematic UHF RF Schematic -47- May Board Layout Top Main Board Assembly 416121B -49- May