Midland Radio SP-300 service manual 39- May

Page 42

MAXON

SP-300 HAND HELD

 

MANUFACTURER'S

REFERENCE NO.

SCHEMATIC

BASE DIAGRAM

PART NUMBER

 

 

 

 

 

5

4

5

 

6

3

8

 

ND433G

D9

7

2

4

 

 

 

 

1

 

8

1

 

1.BASE

 

 

C

 

 

 

 

 

2.COLLECTOR

KTA1663

Q22

B

1 2

3

 

 

 

3.EMITTER

 

 

E

4

 

1.EMITTER

 

C

 

 

 

 

 

2.BASE

 

 

 

 

BLT50

Q502

B

2

3

3.EMITTER

 

 

 

 

 

1

 

4.COLLECTOR

 

E

4 3

2 1

1,4,5,8:EMITTER

5 6 7 8

2,3:BASE

BLT52

Q503

 

6,7:COLLECTOR

 

 

 

 

A

 

 

 

 

 

1SV229

D201,202,301

 

K

 

 

 

 

 

 

SM4004

D15

 

41

40

 

 

 

60

21

 

 

 

 

 

 

 

61

20

HD4074818

IC409

CPU IC

 

 

 

80

1

 

 

 

Page -39- May 2001

Page 41 Page 43
Image 42
Page 41 Page 43
Contents Service Manual Table of Contents Board Layout Exploded View General SpecificationsTemperature Range Current ConsumptionAdjacent Channel Power DimensionsWeight 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 Noise Detector Squelch mute CircuitKHz Band Pass Filter Speaker Audio AmplifierRemoving the belt clip Maintenance and RepairRemoving & Replacing the Belt Clip To replace the belt clipTo replace the battery Removing & Replacing the BatteryTo remove the battery To remove the PTT assemblyRemoving & Replacing the ACCES- Sory Connector Removing & Replacing the Antenna & Control KnobsRemoving & Replacing the Back Cover To remove the Back CoverTo replace the Back Cover Removing & Replacing the Main Board To remove the Main BoardTo replace the Main Board Component Replacement Removing & Replacing the DAUGH- TER BoardsRemoving & Replacing the Speaker Surface Mount Component Replacement Surface Mounted Integrated Circuit ReplacementAlignment Procedure ProgrammingCloning 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 FRONT-END VHF Power AMPUHF Power AMP UHF FRONT-ENDVHF V.C.O UHF V.C.OACC-200 Battery TcxoFuse SP-300 Series VHF RF Schematic UHF RF Schematic -47- May Board Layout Top Main Board Assembly 416121B -49- May
Top Page Image Contents