Kenwood TH-K2AT, K2E, K2ET TH-K2AT/K2E/K2ET

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PC BOARD

TH-K2AT/K2E/K2ET

1

TX-RX UNIT (X57-674X-XX) (A/3) Component side view (J72-0883-09 A/3) 0-11 : K,K2 0-21 : M,M2 2-71 : E 2-72 : E3

2

2		6
KIN4	KYO1	GND
	CN6
PTT	KYO2	BL
1		5
C318		R252
		R252

C310	C312	C313	POWER
			POWER
R246	R248

R335

C258	C257	R223	R209	R208	C256	R207
R224						R207

1 COM0			3
COM1		LCD
COM2		LCD
COM2
COM3
SEG0
SEG1		ANT	4
SEG2		ANT
SEG2
SEG3
SEG4	Q55
	Q55
SEG5	S	C317
	S
SEG6

S	C85

12D

S

TH1	C118
C510
R86

R217

D25

Q38

B

		C253	+
	R349	C249
	R349	Q31 G
		Q31 G
	R203		D
	C247		S
	C247		R354
	C280	C248
		R204

		D34	D26

5

6

R206 Q56

G

D

S

	+
1	C255
IC6
10	C359

C252

	L49
R205	C250
	C250
R202

CN2 +– SP .INT

CP34 CP35 R276

SEG7

D

R328

C345

5

G

R263

SEG8

SEG9

C305

C306

3 2

IC11

4 1

SEG10

SEG11

C304

R242

R243

C307

C308

6

SEG12

3

2

SEG13

R227

IC10

C355

C354

SEG14

4

1

R237

+

R226

SEG15

1

8

C319

C291

SEG16

C290

D40

D41

7

SEG17

IC15

SEG18

1 5

Q47

3 4

SEG19

4

5

3	+	R344	C279

Q37

C

SEG20

SEG21

SEG22

R238	R236
C360

		Q59
	G	D
	G	S
	R264
	1	R261
	1
	IC17	R260
	IC17	R166
	14	R165
	14	R171
		R171
		172	R170
	R

+ C246

E

J3

MIC

J4

SP

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

36 SEG31

C300	C302
6
	IC9
1

C309

R244			Q57
R244			C344
		L63	C344
		L63
4
3		C346
3	Q41
	Q41		C347 C348
C311	4	3
	Q53
	5	1

8

9

R159	C203
R159	R158	R157
04

10

J72-0883-09 (A/3)

11

Component side

Layer 1
Layer 2		12
Layer 3
Layer 4
	Foil side
	13

45

14

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