Midland Radio service manual SP-300 Series

PWR H/L

REVISIONS

REV

DESCRIPTION

BY

386 EN

CHG

DATE

N/S SW

A

RELEASED TO MANUFACTURING

DGC

5/01

P/S 5V

VOLUME

RX EN

AUDIO

CHARGE

TX EN

ALERT

SPK

R435

BUSY

LOCK D/T

PLL EN

LK6

6.8K

D407

C485

CLOCK

MIC1

DATA

R426

R482

R489

C413 C430

C483

5.6V

470P

TCXO

C422

C-MIC

MOD

IC402D

1.2K

4.7K

470P

0.1

470P

N/F

C136

R425

0.01

MC14066BD

R428

100/6V

R481

+

5V

R490

5V

220K

10K

N/F

LK7

Q701

CON406

SP1

IC401A

2.2K

1

IC405A

10

11

CLOCK

2SK1579

+

MC14066BD

R457

4

LM358

ST

ST

RV401

R459

1

IC402C

C701

1

2

3

8

22K

C484

47KB

*10K

2

+

1

2 MC14066BD

LK15

LK14

SWB+

R456

100/6V

470P

2 OHM/1W

1

-

4

6

R701

C421

R703

1

1.DATA

22

220P

12K

2

2.2K

Q412

2.CLOCK

3

8

9

DATA

3

TX 5V

KRA104S

4

4.+7.5V

R401

R702

R704

5

(PD)

D701

6

680K

7

7.5V

12K

100K

Q702

7

7.GND

5.6V

KTC3875

8

Q413

8.MIC+

R408

9

R486

KRC104S

10

22K

R9

68

10.INT_SPK_MIC_DSBL

*

18K

R493

LK2 LK5

R483

2.2K

(ND)

11

11.SPKR+

22K

12

ST

R469

R9A

68

6 -

2.2K

CON701

7

5 +

ST

12 HEADER

R471

C436

5V

C405

IC405B

R427

C418

C419

5V

0.001

R470

30K

0.022(K)

D406

D405

IC402B

LM358

220P

220P

100K

30K

4

2

5.6V

5.6V

14 MC14066BD

-

1

R414

10K

C435

R472

3 +

4

3

C420

IC406B

0.1(K)

36K

IC406A

220P

+ 5

5

4

3

7

KIA324F

KIA324F

C400

R400

R422

RV403

- 6

5

47K

R429

IC411

0.0068

11K

47KB

R424

IC401B

27K

12

X0

X

14

13

10K

MC14066BD

X1

15

C462

R439

R423

Y

Q416

2

Y0

1.2K

1

4

KRA110S

Y1

Z

(PK)

5

Z0

0.047U(K)

3K

IC410B

R441

3

16

KIA324F

3.9K

Z1

4

Q401

+

6

INH

IC401C

6

C464

C465

2 -

1

KRA110S

11

7

5V

A

MC14066BD

6

-

7

3

C478

(PK)

10

C477

D401

B

5 +

+

IC410A

9

8

10/4

470P

C

9

8

C472

+ C431

KDS181

C463

0.033U(K)

KIA324F

14053

R432

R442

0.001

4.7/10

(A3)

7

0.047U(K)

R440

0.033U(K)

27K

4.7K

4.7K

4

C442

IC404B

C44

1

- 2

0.022(K)

KIA324F

-

6

0.01

C466

IC404A

+ 3

7

5

R404

R406

C476

0.033U

R402

R403

+

0.1

(K)

IC410D

IC410C

KIA324F

R476

C456

R446

8.2K

8.2K

C441

8.2K

8.2K

R443

KIA324F

KIA324F

360KR

120P

9

820

0.0018

-

8

2.4K

9 -

C448

R430

C443

C404

R487

10 +

13 -

C469

8

0.0047

0.047(K)

7

6

5

4

3

2

1

C454

1

IC406C

14

10 +

47P

220K

120K

R477

12

C446

V

V

A

V

F

V

N

0.68U

C455

1

KIA324F

+

C468

0.047U

1

R451

47P

O

C

G

O

O

O .

120K

1

S

C

N

I

0.082U

C467

0.033U

(K)

10K

R411

D

1

U

2

N

R444

R409

R407

A

T

V

0.033U

(K)

R412

N/F

D

2

R474

5V

IC406D

R485

(K)

82K

R447

270K

J

C453

C447

RV402

MF6-100

KIA324F

220K

R410

220K

43KR

R475

220K

22K

0.0033(K)

13 -

0.015

22KB

IC407

3.3K

47K

R450

C471

14

9

-

13 -

C427

C474

12

8

F

C

L

I

I

33K

14

0.1(K)

R452

C449

+

IC404D

10

Q402

L

R473

12

0.001

1UF

C

G

K .

N

N

0.033(K)

KIA324F

+

1

IC404C

N/F

I

L

N

R

S

V

V

43KR

C452

+

2.2K

N

K

D

H

1

2

C437

C406

1 KIA324F

0.1U(K)

R449

R405

1UF

0.1

1

1

1

1

1

20K

C470

100K

8

9

0

1

2

3

4

1UF

SWB+

LK3

IC401D

5V

R453

10

11 MC14066BD

IC408

L410

1

8

Q410

KRA104S(PD)

R100

1M

CS

VCC

LK18

R488

470R

R200

C438

1

R431

TX5V

2

7

+

10UH

470P

0

SK

N.C

1.2K

2

47K

6

Q404

3

DI

ORG

C459

C423

KRC104S

R464

4

5

0.1

10/6.3

D404

(ND)

DO GND

4.7K

5V

C458

KDS184

93C56

D403

0.1U(K)

R484

LK16

Q417

Q405

KDS193

4.7K

R417

KRC104S

KTA1504S

(F3)

(ASY)

2.2K

SWB+

(ND)

C460

LED1

5V

R416

15P

GRN

RED

8 7 7 7 7 7 7 7 7 7 7 6 6 6 6 6 6 6 6 6

R461

10K

0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1

1M

C432

Q403

C461

470P

KRC104S

R415

CRG3 ROOVG

X401

15P

(ND)

L XR8 ESSCN

47K

KEN6 SCCCD

3.579545MHz

Q406

1

DATA N

E2 1

60

KRA101S

2

EEP EN

59

3

58

PLL EN

(PA)

4

57

ALART

5

56

DATA IN

6

IC409

55

RED LED

LK4

7

HD4074818P

54

BUSY

8

53

MONITOR

9

52

LOW BATT

10

51

EXT

Q407

5V

11

50

TEST

C439

12

49

KRC101S

D402

R421

47K

X1

C434

13

48

470P

(NA)

KDS181

14

X2(OPEN)

47

0.1

R478

200K*

GND

(A3)

15

46

16

ENCODE1

C

45

5V

17

ENCODE2

L

44

CON404

R479

100K*

PWR H/L

O

LK1

18

L

N C

43

14 PIN

C425

C426

C424

R480

51K*

19

ENCODE3O EMA

42

R460

47K

20

CH1

N C

F L

41

470P

470P

470P

CH2

/

KT S6 L

N/C AUDIO OUT

14

S

XW

F

R433

47K

CC PD

CDA

TX TONES

R454

HHST EEEL ES

13

LK19

4 8 WT T NNKT T

12

BUSY/SQ

R434

47K

22K

2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4

LK20

CALL

R495

1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0

11

LK8

N/F

MONITOR

10

9

PTT IN

8

RX AUDIO IN

LK9

7

ALERT TONE OUT

LK17

R418

CALL LED

CH404

6

LK21

Q411

560

MIC CONTROL

KRC104S

LK22

5

4

AUDIO MUTE

(ND)

3

TX ENABLE

C415

C414

GND

2

470P

470P

LK12

BCD ENCODE SW

1

VCC

C416

7.5V

4/16CH

470P

C433

C428

SWB+

LINK TABLE (0R)

VHF/UHF TABLE

C481

C482

C480

C479

470P

470P

CON401

470P

470P

470P

470P

TITLE

SP-300 Series

LK1

LK2

LK3

LK4

LK5

LK6

LK7

LK8

LK9

LK12 LK14 LK15 LK16 LK17 LK18 LK19 LK20 LK21 LK22

R486 R459 R493 R478 R479 R480

PTT SCHEMATIC

NORMAL

N/F

FIT

FIT

FIT

FIT

N/F

FIT

N/F

N/F

FIT

N/F

N/F

FIT

N/F

N/F

N/F

N/F

N/F

N/F

VHF

33K

1.2K

22K

39K

20K

10K

Digital Schematic Diagram

P/N:480-042-0028

UHF

18K

10K

22K 200K 100K

51K

DOCUMENT

SIZE

B

NUMBER

SCALE

NA

SHEET

1

OF

1

PAGE -44-

May 2001