Midland Radio SP-300 service manual Vhf Front-End, Uhf Front-End, VHF Power AMP, UHF Power AMP

Page 44

6

5

 

 

4

3

 

 

C605

 

 

 

0.001

 

 

 

 

R601

 

 

 

180

C601

L601

C603

 

680pF

 

56pF

 

6T

 

 

 

 

 

 

 

 

L602

L603

 

 

6T

6T

C602

C604

C606

C607

39pF

100pF

120pF

39pF

C608

33pF

R602

6.8K

Q601

 

R603

C611

L604

C613

 

C616

 

820

39pF

 

9pF

MMBR951

 

100pF

6T

 

 

 

R604

 

 

 

 

 

L605

L606

 

C612

 

 

 

6T

6T

2.2

 

 

D601

 

R605

47pF

 

C614

C615

 

 

 

KDS226

 

 

3.3K

 

 

120pF

N/F

 

 

 

 

 

 

C617

47P

C621

100pF

C618

N/F

 

 

 

 

 

 

 

 

RX 5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R601

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

56K

 

 

 

 

 

 

 

 

 

C621

C619

C618

C616

C615

C613

 

C610

C608

C606

C605

C603

C602

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

33P

6P

7P

6P

7P

5.6P

R602

33P

24P

9P

7P

9P

11P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

IN

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUT

 

 

 

 

 

 

L604

 

Q601

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4T

 

2SC5084

 

 

 

 

 

 

L607

 

 

C622

 

 

 

 

 

 

 

C609

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6T

C622

 

18P

 

 

 

 

 

 

 

18P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.01uF

 

 

 

 

 

 

 

 

D601

 

 

 

 

 

 

 

 

 

 

 

L606

 

C614

C624

C612

KDS226

L603

C607

L602

C604

 

 

 

 

 

 

 

 

 

 

4P

 

 

 

 

 

 

 

1

 

 

 

4T

 

3.3P

470P

 

4T

16P

4T

20P

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C617

 

 

 

 

 

 

 

 

 

 

2

C623

GND

C623

L607

C620

L605

 

 

 

 

 

 

 

L601

C601

 

22P

4T

N/F

4P

4T

 

 

 

 

 

 

 

4T

10P

 

 

 

 

 

 

 

 

 

 

39pF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

Notes:

1.ALL VALUES ARE IN OHMS, MICROHENRIES OR MICROFAR- ADS UNLESS OTHERWISE SPECI- FIED.

2.ALL RESISTORS ARE 1/10W 5%

UNLESS OTHERWISE SPECIFIED.

VHF FRONT-END

(148-174MHz Band Shown)

Schematic P/N: 770-110-0012 Rev. C

PCB Assy. P/N: 650-110-0012 Rev C

Notes:

1.

2.

ALL VALUES ARE IN OHMS, MICROHENRIES OR MICROFAR- ADS UNLESS OTHERWISE SPECI- FIED.

ALL RESISTORS ARE 1/10W 5%

UNLESS OTHERWISE SPECIFIED.

UHF FRONT-END

(440-470MHz Band Shown)

Schematic P/N: 770-110-0013 Rev. D

PCB Assy. P/N: 650-110-0013 Rev. D

R501

 

C509

 

 

 

R505

 

 

 

 

2.7K

 

 

 

L506

33

 

 

 

 

 

12P

 

 

 

 

 

 

Q501

 

Q502

 

2.2uH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MMBR951

C502

L502

BLT50

C505

L505

 

 

 

 

C515

C501

 

 

39P

 

 

 

 

 

39P

27NH

 

 

 

 

L507

L508

0.01

 

 

4T

 

 

3P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

L509

8T

4T

5T

 

 

 

L503

 

 

 

 

 

 

 

 

R509

 

Q503

 

 

 

 

 

 

 

150NH

 

BLT52

 

 

 

 

 

 

 

56

 

 

R508

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C504

 

 

 

 

 

 

82

 

 

 

18P

 

 

 

 

 

 

 

 

 

R502

 

 

 

L504

C507

C508

 

 

C513

C514

8.2K

L501

 

 

8T

 

 

 

R503

 

 

 

 

 

 

 

56NH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C517

82P

24P

 

 

 

200

 

47P

N/F

 

 

 

 

 

 

 

R507

 

22P

 

 

 

 

 

 

 

 

82

 

 

 

 

C503

 

 

 

 

 

 

 

 

 

 

R510

C506

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

0.01

 

 

0.01

 

 

 

 

 

 

R501

 

 

 

 

2.7K

 

 

 

 

Q501

 

 

 

 

MMBR951

C502

 

 

C501

8P

 

 

22P

 

 

 

 

1

 

 

 

L502

 

 

 

 

6

 

 

 

1.2UH

R502

L501

C504

 

 

8.2K

R506

 

4T

 

 

 

7P

22

 

 

 

 

C500

 

 

 

 

 

 

 

 

220P

 

C503

 

 

 

220P

 

 

2

 

 

 

 

 

 

 

D501

Q502

BLT50

L503

7T

R504

L504

1.2UH

C505

20P

C507 C508

22P11P

C506

220P

R505

33

Q503

BLT52

C509

N/F

L505

7T

C513

4P

C512

220P

C515

43P

C514 L506

N/F

15P

6

7

2

 

 

 

 

C512

 

 

0.01

 

R506

 

 

22

 

3

4

5

Notes:

VHF POWER AMP

 

 

 

7

KDS181

 

 

R503

 

6.8

 

3

 

Notes:

2.2K

C511

0.001

4 5

UHF POWER AMP

1.ALL VALUES ARE IN OHMS, MICROHENRIES OR MICROFAR- ADS UNLESS OTHERWISE SPECI- FIED.

2.ALL RESISTORS ARE 1/10W 5%

UNLESS OTHERWISE SPECIFIED.

(148-174MHz Band Shown)

Schematic P/N: 770-230-0012 Rev. A

PCB Assy. P/N: 650-230-0012 Rev. A

1. ALL VALUES ARE IN OHMS, MICROHENRIES OR MICROFAR- ADS UNLESS OTHERWISE SPECI- FIED.

2. ALL RESISTORS ARE 1/10W 5%

UNLESS OTHERWISE SPECIFIED.

zNote: Schematics are for reference only. Based on band selection, reference designators and part val- ues may differ from schematics shown.

(440-470MHz Band Shown)

Schematic P/N: 770-230-0013 Rev. B

PCB Assy. P/N: 650-230-0013 Rev. B

PAGE -41- May 2001

Page 43 Page 45
Image 44
Page 43 Page 45
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 replace the Back Cover Removing & Replacing the Back CoverTo remove the Back Cover Removing & Replacing the Main Board To remove the Main BoardTo replace the Main Board Removing & Replacing the Speaker Component ReplacementRemoving & Replacing the DAUGH- TER Boards Surface Mount Component Replacement Surface Mounted Integrated Circuit ReplacementCloning Alignment ProcedureProgramming 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.OFuse ACC-200 BatteryTcxo SP-300 Series VHF RF Schematic UHF RF Schematic -47- May Board Layout Top Main Board Assembly 416121B -49- May
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