Kenwood TH-K2AT, K2E, K2ET 46

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B

C

D

E

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G

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J

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2

TH-K2AT/K2E/K2ET PC BOARD

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

3

4

5

6

7

8

9

10

11

12

13

46

14

C235

C101

C99

C97

C96

C95

D17

C93

D12

D13

L41

C100

L23

L21

C98

L20

C92

R290

C162

R291

L22

C94

L19

D10

CN15

R285

CP32

CP33

R253

R254

R256

R312

R235

R277

R326

6

4

120

91

1

90

IC12

X3

R310

R275

1

3

R313

C316

C314

C330

1

6

IC8

ENCB INVOL OUTVOL GND

ENCA GND

C295

R318

CN1

C293

C294

							R104
C504	D21	C163	D20	L38			Q17
C504	D21	C163	D20	L38			S
							D
C160	R111			C158			G
				C158
L40		R110					R102
							R102
		C502		C159	R345
		C502		C159	R345
		C89		L18	R61	R62	C90
							C90
					C91
				C88
		L17
						C503
						C366
CN17

L16

C153	C152
	R103

CN10

C236			Q52	R286		C357			C82	R
			R325
30			61			D24	R181	R162	C207
			CP31	R185	C230	D24		Q30		C206
31		60	CP31	R185	C230	C229C226		Q30		C206
31		60
	C335	C336				R353				R
C332	C335	C336				R353

C303

+

R190			R343	R283	R342	R282
R191										R200 C232
D36	C281	C285			C284				R201 C517	R200 C232
			C286			1				C242
						1
	C299	C283				2	IC4	4	C241
		C283								R199	R198
	R241	C298	R240			3				R199	R198
						3				C240
			R239		C297

C239

R196

C512	R192
R197
	R194

R195 C238

+C237

R193

C505

D74

TH4

C511

D79

	C228	R179
	D27	R180
	D27	C224
		C224
		C223
	R183
	C227
D22	R182		5
	R182
			1
	C231
	C358	Q29	R1
		Q29

							J72-0883-09 (A/3)
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
IC5	10K	Q9	4N	Q52	7G	D10	3G	D22	10J	D73	7N
IC8	7E	Q10	5N	Q58	6L	D12	3G	D24	8I	D74	11I
IC12	6B	Q11	6M	D1	3R	D13	3G	D27	9J	D79	11I
IC16	8L	Q16	4L	D2	3R	D17	3F	D30	8N
Q1	4P	Q17	3J	D5	2Q	D18	2L	D32	8M
Q2	3O	Q29	10J	D6	3Q	D19	2K	D33	8N
Q3	3P	Q30	8J	D8	4M	D20	3I	D35	7N

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