Midland Radio SP-300 Removing & Replacing the Battery, Removing & Replacing PTT Assy

Page 17

MAXON

SP-300 HAND HELD

REMOVING & REPLACING THE BATTERY

To remove the battery:

1.Holding the radio chassis in one hand, press and hold the battery release catch on the upper back of the radio with the other hand.

2.Pull the battery back and away from the radio.

3.Remove the battery from the radio.

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.Remove the 2 screws located at the top and bottom of the PTT switch holder housing. This will allow removal of the PTT holder (A) and PTT pad (B).

1

VOL

1 2 3

ANT

 

 

VOL

 

1

 

 

 

3

 

 

 

 

2

 

 

1

CH

4

 

 

2

 

 

4

3

 

ANT

CH

 

ANT

 

 

 

 

 

 

 

T

 

 

2

Figure 3-Battery Removal

B

A

1

Figure 4-PTT Removal

Page -14- May 2001

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Contents Service Manual Table of Contents Board Layout Exploded View Temperature Range SpecificationsGeneral Current ConsumptionWeight DimensionsAdjacent Channel Power Frequency BandsPeak Deviation @ 1 kHz Nom. Dev +20dB ReceiverRX Tone Demodulation Characteristics SP-300INTRODUCTION FeaturesBusy Channel Lockout VCO Lock Time Description Description of ControlsDigital Circuits Theory of OperationRF Circuits RF Circuits PLL Synthesizer KHz Band Pass Filter Squelch mute CircuitNoise Detector Speaker Audio AmplifierRemoving & Replacing the Belt Clip Maintenance and RepairRemoving the belt clip To replace the belt clipTo remove the battery Removing & Replacing the BatteryTo replace the battery To remove the PTT assemblyRemoving & Replacing the Antenna & Control Knobs Removing & Replacing the ACCES- Sory ConnectorTo replace the Back Cover Removing & Replacing the Back CoverTo remove the Back Cover To remove the Main Board Removing & Replacing the Main BoardTo replace the Main Board Removing & Replacing the Speaker Component ReplacementRemoving & Replacing the DAUGH- TER Boards Surface Mounted Integrated Circuit Replacement Surface Mount Component ReplacementCloning Alignment ProcedureProgramming RX VCO S.G. @ 1kHz Audio Test Equipment SetupTP1 Alignment Points DiagramSymptoms Causes Counter Measures Troubleshooting GuideMain Circuit Voltage ChartsReceive State Transmit State REF# Description PART# SP-300 Series UHF & VHF Digital Section Parts List-30- May REF # Description Replacement Modules SP-300 Series VHF RF Section Parts List-32- May -33- May SP-300 Series UHF RF Section Parts List -35- May -36- May -37- May KTA1504SY Component Pinout-39- May Base Diagram PIN Description UHF Power AMP VHF Power AMPVHF FRONT-END UHF FRONT-ENDUHF V.C.O VHF V.C.OFuse ACC-200 BatteryTcxo SP-300 Series VHF RF Schematic UHF RF Schematic -47- May Board Layout Top Main Board Assembly 416121B -49- May