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Kenwood TH-K2AT, K2E, K2ET TH, K2AT/K2E/K2ET, TH-K2AT/K2E/K2ET, 0-11 :K,K2

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TH-

K2AT/K2E/K2ET

PC

BOARD

PC BOARD

TH-K2AT/K2E/K2ET

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

Foil side view (J72-0883-09 A/3)

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

Foil side view (J72-0883-09 A/3)

0-11 : K,K2

0-21 : M,M2

2-71 : E

2-72 : E3

0-11 : K,K2

0-21 : M,M2

2-71 : E

2-72 : E3

1

2

3

4

L23

C101

C99

C100

L22

	C97	C95
		C96
L21	C98	L20

CN15

D17

C92

C94

L19

C93	D12	D13
		R290

D10

L41

C162

R291

C504	D21	C163	D20
C160	R111			C158
				C158
L40		R110
L40			C502	C159
			C502	C159
			C89	L18

L38

R345
R61	R62
C91

R104

Q17

D

S

G

R102

C90

C153	C152	R101
	R103	L35

		D19	C147
		R100
	C148		R99
	C148	C500	C501
		C500	C501

C76

L15

C329

D18	L32
C145						C135	R46
C145
C142	C141	R95				L28		D9
C142	C141	R95				C136


				C137		L29		C19
	R96			C138			D8	C19
				C138			D8	R45

R98					L66
					L66			R47

R341		Q16
		Q16			C133	R94		R347

R97		4	1
		4	1
								C325
C134		3	2		R91			R346
	R93			R92				C64
								C64

C18

L9	R17
C61
	Q9

R49

C17

Q5

R15

R16

R348

R14

	R12
C15	L8	C14
	L8
Q2
Q2
R11
C13	L5
C13	R9
	R9	C9

R5	R4
R6	G	D
C11	G	S
C11		Q3
		Q3
R22	R10	C3
C8
		Q1

D5

C4

C6	C5
	L2
C10	R8
	R8
	R7
R13

D2
D6	L6
C7

	L1
D1	LV
L3	C2
L3

3

4

5

6

7

C235

	6
	IC12
R275	1
C316
	C330
IN VOL OUT VOL GND 1	ENCA 6 GND ENCB

CN1

3 4

C314

R310

R313

R318

R285	CP32	CP33	R253	R254	R256
R285			R253	R254	R256
	120
	1

IC8

R312	R235		L17
			L17
	R277	R326
	91
	90
			X3
			CN17

C293	C294	C295

C88					C132	C129
				C75	C132	C131
						C131

				L56		C130
C503				L55
C366				L55	C74	L26
C366
				C72
	R60			L14
	R60		R64
CN10		Q58	R64
CN10	R59	Q58	G	S D	D	S
				C73
				L13		Q11
				C323
				C84
L16	C83

L27
R88
	C69	R39
L12	C326
	C326
G	L54	R54
	C71
	C327
	R56

R50

	L10	C65
	2	3
	Q10
	1	4
R271		C67
R271	R53
	L11

C68

R41

R55

D73

R42	R52
R51
C324

B

R130

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9

C236

C303

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31
C332	C335		C336
C332
R191	R343	R283	R342	R282
R190	R343	R283	R342	R282
			C284

	R325	R286
	Q52
	61		D24
60	CP31		D24
60
		R185	C230
	C232	C512

C357

R353

TH4

			C82	R169
				R169
			R164				5
			C207	R273			5
C229C226	R162		C207	R273
C229C226	R181	Q30	C206	R163	C208		8
							8
			R161		R160
			R178		C205
	C228	R179			R175
	D27	R180		C225	R175
	D27			C225	C222	R177

		C224
		C224
		C223

C202

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IC16

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C209 C201

C210 R155 R156

L50

D32

B

D35

D33

C352	C276	C353

C282

D30

CD1

C178

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+

D36	C281		C286	1
D36	C281		C286
		C285
	C299	C283		2	IC4
	C299

	R241	C298	R240	3
		C298	R240

			R239	C297

	C517					R192
	C517	C242				R197
		C242				R197	+
	R201	R200				R194	+	C237
	R201	R200				R194		R193
4	C241							R193
4	C241
		R199	R198					C505
		C240		R196
			C239		R195	C238	D74
			C239				D74

J72-0883-09 (A/3)

C511		R183
	R186	C227
	R186			5			R174	C220
	D22	R182		5		3 4	R174	C220
	D22			1	IC5	3 4	R173		C338	C270
							C221
		C231	Q29				C218
D79			Q29				C218	C219
		C358		R176				C219
		C358		R176

E

Q33C

C179

C124

+C177

CF1

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11

Component side

Ref. No.

Address

Ref. No.

Address

Ref. No.

Address

Ref. No.

Address

Ref. No.

Address

Ref. No.

Address

IC4

10E

Q5

3N

Q33

9N

D9

3M

D21

3H

D36

9D

Layer 1

12

Layer 2

12

IC5

10K

Q9

4N

Q52

7G

D10

3G

D22

10J

D73

7N

Layer 3

IC8

7E

Q10

5N

Q58

6L

D12

3G

D24

8I

D74

11I

IC12

6B

Q11

6M

D1

3R

D13

3G

D27

9J

D79

11I

Layer 4

Foil side

IC16

8L

Q16

4L

D2

3R

D17

3F

D30

8N

13

Q1

4P

Q17

3J

D5

2Q

D18

2L

D32

8M

13

Q2

3O

Q29

10J

D6

3Q

D19

2K

D33

8N

Q3

3P

Q30

8J

D8

4M

D20

3I

D35

7N

	46								47
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Contents

PC BOARD TX-RXUNIT (X57-674X-XX)(A/3) TX-RXUNIT (X57-674X-XX)(B/3),(C/3) PB-43N (Ni-MHBATTERY PACK) PG-4Y(PROGRAMMING INTERFACE CABLE) ■Numeric key PC board (TX-RXunit B/3) ■ PTT PC board (TX-RXunit C/3) ■TX-RXPC board (TX-RXunit A/3) Page 1. Gluing to the key top (MIC element section) Fig 2.Bending the LCD hardware fixture (J21-8456-03)tabs 3. PTT PCB (TX-RXunit C/3) installation procedure 4.Packing (G53-1572-02)TX/BUSY lamp installation procedure 6.Cautions for installing the chassis on the case assembly 5.Packing (G53-1572-02)bottom installation procedure 7.Cautions for installing the key top on the case assembly Table 1 Basic configuration ■Front End ■First Mixer Table 2 MCF (L71-0619-05)characteristics (TX-RXunit XF1) Fig. 2 Receiver section configuration ■IF Circuit ■Squelch and Mute Circuit ■S Meter Circuit Fig. 3 IF, Squelch, Mute and S meter circuit ■AF Amplifier ■Microphone Amplifier Circuit Fig. 5 Microphone amplifier circuit ■Modulation Circuit ■Drive and Final Circuit ■Transmission/Reception Switching Circuit ■Temperature Protection Circuit ■PLL Circuit ■VCO Circuit Fig. 8 PLL and VCO circuit ■Unlock Detection Circuit ■Charging Circuit ■Power Supply Switching Circuit ■Battery Type Recognition Circuit Fig. 10 Charging and Power supply switching circuit ■Reset and Backup Circuit ■Voltage Detection Circuit ■Battery Save Circuit ■LED Drive Circuit Fig. 13 LED drive circuit Fig. 12 Battery save circuit ■Key and Encoder Input Circuit 16 key (K, K2, M, M2 and E3 types) 4 key (E type) Fig. 14 Key and Encoder input circuit ■CTCSS/DCS ■DTMF ■VOX ■ Weather Alert (K and K2 types only) Fig. 15 CTCSS/DCS, DTMF, VOX, Weather alert ■Pin function TX-RXUNIT (X57-674X-XX) Page TH-K2AT/K2E/K2ET (Y50-580X-XX) TX-RXUNIT (X57-674X-XX) TH-K2AT/K2E/K2ET TX-RXUNIT (X54-674X-XX) 0-11 :K, K2 0-21 :M, M2 2-71 :E Page Page Page Page Page Page Page Page Page Operation B. Battery terminal reference voltage (7.5 V [Battery terminal]) D. S-meter(Two segments in S-meterlight, all segments in S-meterlight) E.RX BPF (Lower limit frequency, center frequency, upper limit frequency) Page Page Page L. DCS modulation balance O. VOX sensitivity (Level 1, level 9) Item Condition Adjustment Unit Terminal Note: If the Note: In the Page Note: Do not Page Page Page Terminal Unit Adjustment points TX-RXunit (A/3) Component side view TH-K2AT/K2E/K2ET PC BOARD TH-K2AT/K2E/K2ET Page PC BOARD TH-K2AT/K2E/K2ET 1 TH-K2AT/K2E/K2ET PC BOARD TH Page PC BOARD TH-K2AT/K2E/K2ET TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM Page Page Page Page TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM Transmitter Section Section Receiver Page Page Photo is K type