Kenwood TH-K2AT, K2E, K2ET manual 56

U V W X Y

TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM

TX-RX UNIT (X57-674X-XX)(A/3) 1

5T

+B

RF SW

D8

HSC277

D9

HSC277

RF SW

R45 3.3k R46

5R

5T

	5.6k
	R47
10k	1000p
	C61

				T:4.23V
				R:0V
TX PATH
	RF AMP				330
	Q9
R347	2SC5488
					R49
100
2.00V	R346	68	C325	1000p	C64	1000p
							33
							R50
4.90V

C65	18p
82n	100
L10	R42
470	1k
R51	R52

T:4.85V

R:0V

						C68
			100	82n		18p
		DRIVE
1.40V
		AMP	R53	L11
		Q10
		2SC4926YD		1000pR34	C70
	C324	1000p	C67			1u
			C66	3.3k
R33	22	Q15		1u
		2SC4617(R)
	Q10 OPERATION SW
				5T

R41 270

R271

12	270
	R39

12.46V

L55

C75

C326

1.30V

10n

1000p

1000p

L12

Q11

L14

47n

C74

33p

L56

4p

10n

2SK2596

56n

100

DRIVE

C69

R54

AMP

L54

R55 470

R56 1k

C327

0.1u

C71

1000p

C73

1000p

L13

C72

0.1u

VOLTAGE

D73

MA2S111

DROP

VGG

VDD

C329

56p

22n C76

L15

6.8n 39p

2

L28	L29	22n	C137
27n			5p	1000p
	12p		C138
	C136
		10p	L66	120n
	C135

12.29V

Q12

POWER

2SK3476

AMP

T:0V

56p

100p

R:0V

CN10

C85

C366

R58

10

R59

12k

R60

56k

C78

1000p

C328

1u

R64

0

Q12 GATE

VOLTAGE SW

Q58

2SK1830

2.29V

C323

1000p

(HIGH POWER)

100p
C503	1u	0.1u	0.01u
	C357	C84	C83

C82 1000p L16

L17		C89
18.5n	1000p
	C88	56p
		220n
		L18
	R61	220
	R62	220
C91	1000p	C90

1000p

ANTENNA SW

D10

XB15A709

L19

C93 8p

C94

1000p

C95 9T 12p

D12

L20		L21			L22
7T		9T			9T
C96	12p C98		8p	C100		7p
(G)		(B)			(B)
(G)	12p	(G)	13p	(G)		24p
HVC131	C97	HVC131	C99			C101
	D13		C92	1000p	D17
D12,13				HSM88AS

(G)

L23 9T

OVER INPUT PROTECTION

ANT

3

FINAL

+B
APC CIRCUIT	Q13
OPERATION SW
	2SK1830

		C510
		*						R74
							100k
						C105	1000p	(D)
R70	0.39	R71	0.39	R72	0.39
						C106	1000p	R75
								100k
								(D)

	R76 150k	(D)
	C108	APC
150k		DIFFERENTIAL
	100p	AMP
		IC2 NJM2904V
R77	(D)
		1	8
		AOUT	V+
		2	7
C109	1000p	A-IN	BOUT
		3	6
		A+IN	B-IN
		4	5
150k		GND	B+IN
	(D)
	R79

5T

10k
R80
C111	1000p

			APC OUTPUT SW
			DC SW	R85
R81	390k
C112	1000p
			Q14
R83	56k	APC	RN4902

ANTENNA SW

560

C116 10u4 D15

VGG

MA8039

C117 1000p

	R86
C118	1000p

TH1 5.6k

TEMP COMPENSATION

- t10k

KAPC

TEMP

5T
C107	1000p

R78		C110	1000p
	150k (D)	C356	0.01u

R82 27k

C113 1000p R84 100k D14 MA2S111 C114 1000p C115 1000p

KAPC

APC OUTPUT VOLTAGE LIMITTER

D14

38.85MHz

1st IF

2.68V

R95 100k

REVERSE CURRENT PREVENTION

R90	XF1
	L71-0619-05
330	C128	R88

L27	R91	1k
680n

4.71V	1st MIXER
	Q16

D18,19

RX BPF TUNING

					0.01u	330
R351	220	C125	1.5p	C126	10p	L26

470n R92 3.3k C129

3SK318

11p

2.42V				C501
R341	C142			1.5p
0	1000p	C145	22p	(B)

C500

1.5p

(B)

R102

0

4.66V

0.27V

R345

D20,21

RX BPF TUNING

C159 C502

2p 3p

47

R93

X57-674X-XX

0-11 TH-K2AT K,K2

2-71 TH-K2E E

C130	1000p	C131	0.01u
	C132	0.01u
	D44
B30-2205-05
	NO

R94 330	C133	0.01u	C134	1000p	R96 82k	R98 82k
					C141	1000p
	D47				D60
B30-2205-05					NO
	NO			MA2S111

R97	82k				(G)
	L32	82n	D18	1SV305	R99	1.0M
					C147	1000p

D62	D63	Q59
MA2S111	MA2S111	2SK1830
MA2S111	NO	NO

R100 1.0M

C320

8200p

NO

D19	1SV305	47 L35
		R101
	5R
	C321
	8200p
	NO

R103	2.7k
C152	1000p

C153

C350 C510

0.1u NO

NO 100p

	Q17		0
2SK1215(E)
RX 1st AMP
			82n
1000p	R104	56	L38
C511		C512
NO			NO
470p			470p

C158	22p
D20	1SV305

C514

NO

470p

(B) (G)

R110 1.0M

C515

NO

470p

(B)

	C160
1.0M	D21
R111
C163	1000p
C516
	NO
470p

(G)	(B)
27p	2p
1SV305	C504

C517

NO

470p

L41 L40

18n 68n

C162 R291 R290

47p 0 0

(G)

4

5

6

5R

2-72 TH-K2ET E3

B30-2205-05 B30-2205-05 NO MA2S111 NO NO NO NO

NO 100p

470p 470p

470p

470p

470p

470p

0-21 TH-K2AT

M,M2

B30-2205-05

B30-2205-05

NO

NO

MA2S111

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

X57-674X-XX

R230

R257

R258

R259

R261

R264

R344

CN17

0-11

TH-K2AT

K,K2

220

56k

680

680k

47k

NO

100k

NO

2-71

TH-K2E

E

NO

NO

0

0

NO

0

NO

E23-1081-05

2-72

TH-K2ET

E3

220

NO

0

0

NO

0

NO

E23-1081-05

0-21

TH-K2AT

M,M2

220

NO

0

0

NO

0

NO

NO

Note : The components marked with a
dot ( ● ) are parts of layer1.	7

BPF/APC

Reference voltage value are measured when the power supply voltage is 13.8V(DC IN).

X57-674 5/5