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Kenwood K2E manual

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Table of contents for the manual

  • Page 1

    144MHz FM TRANSCEIVER TH-K2AT/K2E/K2ET © 2003-8 PRINTED IN JAPAN B51-8658-00 (S) 836 SERVICE MANUAL DISASSEMBLY FOR REPAIR ................................... 2 CIRCUIT DESCRIPTION ............................................ 6 SEMICONDUCTOR DATA ...................................... 14 COMPONENTS DESCRIPTION .............................. 15 PAR[...]

  • Page 2

    TH-K2AT/K2E/K2ET 2 DISASSEMBL Y FOR REP AIR How to remove the case assembly from the chassis 1. Remove two screws ( z ) holding the chassis. 2. Pull out two knobs ( x ) and remove two round nuts ( c ). 3. Pull out the SP and MIC parts of the cap from jacks ( v ). 4. Turn the unit over with the bottom of the chassis facing upwards, and remove the ch[...]

  • Page 3

    TH-K2AT/K2E/K2ET 3 DISASSEMBL Y FOR REP AIR Soldering the antenna terminal 1. With the shield cover removed from the antenna terminal section, install two screws on the PC board and bring the PC board into contact with the chassis ( z ). 2. Solder the antenna terminal with a soldering iron ( x ). 3. Remove the two screws installed in step 1 above, [...]

  • Page 4

    TH-K2AT/K2E/K2ET 4 DISASSEMBL Y FOR REP AIR Special care and attention required for assembly 1. Gluing to the key top (MIC element section) You must also glue on the speaker storage area and heap the glue up until wealthy glued on the speaker storage area and the key top for waterproofing the MIC element side of the key top. (Fig. 1) Fig. 1 2. Bend[...]

  • Page 5

    TH-K2AT/K2E/K2ET 5 DISASSEMBL Y FOR REP AIR 4. Packing (G53-1572-02) TX/BUSY lamp installation procedure (1) To assure waterproofing, install the packing in the chassis groove as shown in Fig. 5. ( z ) (2 )I nstall the packing TX/BUSY lamp section on the chassis. ( x ) z x OK Packing NG Packing Chassis Chassis 5. Packing (G53-1572-02) bottom instal[...]

  • Page 6

    TH-K2AT/K2E/K2ET 6 CIRCUIT DESCRIPTION Frequency Configuration The frequency configuration is shown in Figure 1 and Table 1. Fig. 1 Frequency configuration 174.850~212.845MHz (K,K2,M,M2) 182.850~184.845MHz (E,E3) 144.000~147.995MHz(K,K2) 136.000~173.995MHz(M,M2) 144.000~145.995MHz(E,E3) 136.000~173.995MHz(K,K2,M,M2) 144.000~145.995MHz(E,E3) 144.000[...]

  • Page 7

    TH-K2AT/K2E/K2ET 7 CIRCUIT DESCRIPTION ■ IF Circuit The first IF signal (38.85 MHz) amplified by the IF amplifier (Q24) and the second IF signal (38.4 MHz) generated by tripling the 12.8 MHz reference oscillator frequency of the TCXO (X1) by Q23, are mixed in the FM IC to produce a second IF signal (450 kHz) (Lower heterodyne). The second IF sign[...]

  • Page 8

    TH-K2AT/K2E/K2ET 8 CIRCUIT DESCRIPTION Transmitter System ■ Microphone Amplifier Circuit The audio signal from the microphone passes through a high-pass filter (IC5) and enters a microphone amplifier (IC16). The signal passes through a pre-emphasis circuit, limiter amplifier and splatter filter inside the microphone amplifier. The splatter filter[...]

  • Page 9

    TH-K2AT/K2E/K2ET 9 CIRCUIT DESCRIPTION The APC voltage controls the gate voltage of Q11 and Q12, and keeps transmission output stable. The MPU detects power supply voltage and controls Q58 by transmission power supply voltage and transmission power. For example, if the power supply voltage during transmission, is equal to or higher than approx. 10.[...]

  • Page 10

    TH-K2AT/K2E/K2ET 10 Power Supply Circuit ■ Charging Circuit When an external power supply is connected to the DC IN terminal, the constant-current circuit consisting of Q33 and D31 provides a constant current of approx. 110 mA to the Ni- MH battery. If no external power supply is connected to the DC IN terminal, the constant-current circuit does [...]

  • Page 11

    TH-K2AT/K2E/K2ET 11 ■ Voltage Detection Circuit Various voltages are input to the A/D port of the MPU (IC8) for processing. Battery voltage is divided with resistors (R240, R241) and enters the BATT terminal (pin 52) of the MPU. Battery voltage is used for battery meter indication during transmission or for alert tone processing when an abnormal [...]

  • Page 12

    TH-K2AT/K2E/K2ET 12 ■ Key and Encoder Input Circuit The POWER key is assigned to the interrupt port (pin 95) of the MPU. The PTT key is assigned to the dedicated port (pins 13, 14) of the MPU. SET CALL # 0 ∗ MONI MR 9 8 7 LAMP VFO 6 5 4 MENU F 3 2 1 KIN0 KOUT0 KOUT1 KOUT2 KOUT3 PWRSW 95 S7 POWER SW J3 ROT ARY ENCODER KIN1 KIN2 KIN3 KIN4 IC8 MPU[...]

  • Page 13

    TH-K2AT/K2E/K2ET 13 ■ CTCSS/DCS The encode signal is generated by the MPU (IC8) and output from the TONE terminal (pin 41) of the MPU. The unwanted high-frequency components of the encode signal output from the MPU are removed with a low-pass filter, and applied to VCO modulation input (MOD) and TCXO VC terminal for modulation. The VCO and TCXO m[...]

  • Page 14

    TH-K2AT/K2E/K2ET 14 MPU : 90522BPFFG139 (IC8) ■ Pin function 1 CLOCK O Common serial clock output 2 DATA O Common serial data output 3 EEPDI I Data input from EEPROM 4 EEPCS O Chip select output to EEPROM 5 VOX O VOX power supply switch L:ON 6 BPF/APC O BPF tuning voltage output, APC voltage output (PWM) 7 KAPC O APC ON/OFF switch L:APC ON 8 VCC [...]

  • Page 15

    TH-K2AT/K2E/K2ET 15 98 DCDET I DC IN detection interrupt input ( ↓ ) L:DC IN connected 99 RXLED O Busy LED output H:ON 100 BSFT O Beat shift swiching output H:ON 101 PLLEN O Serial enable output to PLL IC 102 PLLLD I Lock detection input from PLL IC H: Lock 103 KIN0 I Key matrix input 0 104 KIN1 I Key matrix input 1 105 KIN2 I Key matrix input 2 [...]

  • Page 16

    TH-K2AT/K2E/K2ET 16 D33 Reverse current Battery prevention D34 AVR constant-voltage D35 Reverse current Battery prevention D36 Reverse current DC IN prevention D40 TX LED Lights on TX D41 BUSY LED Lights on RX D42-44 Key illumination Key backlight illumination D46,47 LED D48,49 LCD illumination LCD backlight illumination LED D60 Key type detection [...]

  • Page 17

    TH-K2AT/K2E/K2ET 17 ∗ New Parts. indicates safety critical components. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. L : Scandinavia K : USA P : Canada Y : PX (Far East, Hawaii) T : England E : Europe Y : AAFES (Europe) X : Australia M : Ot[...]

  • Page 18

    TH-K2AT/K2E/K2ET P ARTS LIST 18 TX-RX UNIT (X57-674X-XX) Destination Ref. No. Parts No. Description Address New parts Destination Ref. No. Parts No. Description Address New parts E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT C33 C92-0002-05 CHIP-TAN 0.22UF 35WV C34 C92-0714-05 TANTALUM 4.7UF 6.3WV C35 C92-0001-05 CHIP-C [...]

  • Page 19

    TH-K2AT/K2E/K2ET P ARTS LIST 19 TX-RX UNIT (X57-674X-XX) Destination Ref. No. Parts No. Description Address New parts Destination Ref. No. Parts No. Description Address New parts E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT C230 CK73FB1C105K CHIP C 1.0UF K C231,232 CK73HB1H102K CHIP C 1000PF K C235,236 CK73HB1C103K CHIP[...]

  • Page 20

    TH-K2AT/K2E/K2ET P ARTS LIST 20 TX-RX UNIT (X57-674X-XX) Destination Ref. No. Parts No. Description Address New parts Destination Ref. No. Parts No. Description Address New parts E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT L55 L41-1078-14 SMALL FIXED INDUCTOR L56 ∗ L41-2278-14 SMALL FIXED INDUCTOR L58 ∗ L41-8285-14[...]

  • Page 21

    TH-K2AT/K2E/K2ET P ARTS LIST 21 TX-RX UNIT (X57-674X-XX) Destination Ref. No. Parts No. Description Address New parts Destination Ref. No. Parts No. Description Address New parts E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT R160 RK73HB1J472J CHIP R 4.7K J 1/16W R161 RK73HB1J102J CHIP R 1.0K J 1/16W R162 RK73HB1J184J CHI[...]

  • Page 22

    TH-K2AT/K2E/K2ET P ARTS LIST 22 TX-RX UNIT (X57-674X-XX) Destination Ref. No. Parts No. Description Address New parts Destination Ref. No. Parts No. Description Address New parts E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT MIC1 T91-0580-05 MIC ELEMENT D1,2 1SV325 VARIABLE CAPACITANCE DIODE D5 HSC277 DIODE D6 1SV305 VAR[...]

  • Page 23

    TH-K2AT/K2E/K2ET 23 EXPLODED VIEW (TH-K2A T / K2ET) Parts with the exploded numbers larger than 700 are not supplied. A B 1 2 3 3 7 C B 34 35 6 40 16 D D D 29 10 8 9 15 19 18 17 36 37 D TX-RX Unit (B/3) TX-RX Unit (C/3) TX-RX Unit (A/3) Dx2 D D E Ex2 D Dx2 D 23 33 39 28 14 22 Ax2 13 21 E E 5 4 12 702. ST ANDARD LABEL : K, K2 701. STICKER Fx2 1 (K2,[...]

  • Page 24

    TH-K2AT/K2E/K2ET 24 Parts with the exploded numbers larger than 700 are not supplied. EXPLODED VIEW (TH-K2E) C D 1 2 3 2 7 C B 34 35 6 40 16 D D D 29 10 8 9 15 19 18 17 38 37 D TX-RX Unit (B/3) TX-RX Unit (C/3) TX-RX Unit (A/3) D D D 23 33 39 28 14 22 13 21 E E 5 4 12 A: N09-1492-05 B: N14-0569-04 C: N14-0573-04 D: N79-2035-46 E: N79-2040-45 F: N82[...]

  • Page 25

    TH-K2AT/K2E/K2ET 25 E F 1 2 3 704. PAMPHLET 11.INSTRUCTION MANUAL (B62-1696-00) (B62-1697-00):K,E,E3 (B62-1699-00):E,E3 (B62-1702-00):E,E3 (B62-1757-00):E,E3 (B62-1758-00):E,E3 41.HELICAL ANTENNA (T90-1018-25) 43.CHARGER (120V/13.8V) (W08-0960-15) : K 42.CHARGER (230V/13.8V) (W08-0959-15) : M, E, E3 30. BELT HOOK ASSY (J29-0709-04) 32.HANDSTRAP (J6[...]

  • Page 26

    TH-K2AT/K2E/K2ET 26 P ACKING (K2 and M2 types) Parts with the exploded numbers larger than 700 are not supplied. G H 1 2 3 11.INSTRUCTION MANUAL (B62-1695-00):M2 (B62-1696-00) (B62-1697-00):K2 704. PAMPHLET 25.ITEM CARTON CASE (H52-2009-02) 41.HELICAL ANTENNA (T90-1018-25) 32.HANDSTRAP (J69-0342-05) : M2 27. PACKING FIXTURE (H12-3147-03) 30.BELT HO[...]

  • Page 27

    TH-K2AT/K2E/K2ET 27 ADJUSTMENT Single Tone Mode This mode is used to check the DTMF deviation. Operation ■ 16key (K, K2, M, M2 and E3 types) 1. Press the [PTT] key on the transceiver to switch to the transmission mode. 2. Press the [MONI] key to enter the single tone mode. 3. Press any key from [1] to [8] keys to transmit a single tone. The singl[...]

  • Page 28

    TH-K2AT/K2E/K2ET 28 6. To exit the Adjustment Mode, turn the transceiver OFF. Note: • When you press [LAMP] or [MONI] key, ensure the bosses of rubber keys align with the LAMP and MONI contacts of the PTT PCB (C/3). • In the Adjustment Mode, Transmission and Reception frequencies becomes extensive. A. Overvoltage warning reference voltage (14.8[...]

  • Page 29

    TH-K2AT/K2E/K2ET 29 D. S-meter (Two segments in S-meter light, all segments in S-meter light) 1 S-meter (Two segments in S-meter light) (1) Press the [LAMP] or [MONI] key on the transceiver to display “S1” on the LCD. The current RSSI level value is displayed at the lower digits of the frequency display, and the value stored in the EEPROM is di[...]

  • Page 30

    TH-K2AT/K2E/K2ET 30 (8) Press the [MENU] key to write the current APC value into the EEPROM. 2 7.5V TX H power (Center frequency) (1) Press the [LAMP] or [MONI] key on the transceiver to display “P7C” on the LCD. In this case, the “ ” icon appears. (2) Press the [VFO], [MR] or [CALL] key to switch to the frequency display. (3) Turn the enco[...]

  • Page 31

    TH-K2AT/K2E/K2ET 31 (2) Press the [VFO], [MR] or [CALL] key to switch to the frequency display. (3) Turn the encoder to display the lower limit frequency on the LCD. (4) Press the [CALL] key to switch to the adjustment display. (5) Press the [PTT] key to enable the transmit mode. (6) Adjust the output voltage from DC power supply until the voltage [...]

  • Page 32

    TH-K2AT/K2E/K2ET 32 J. 13.8V TX M power (Lower limit frequency, center frequency, upper limit frequency) 1 13.8V TX M power (Lower limit frequency) (1) Press the [LAMP] or [MONI] key on the transceiver to display “P13L” on the LCD. In this case, the “ ” icon appears. The current APC value is displayed at the lower digits of the frequency di[...]

  • Page 33

    TH-K2AT/K2E/K2ET 33 (2) Press the [VFO], [MR] or [CALL] key to switch to the frequency display. (3) Turn the encoder to display the upper limit frequency on the LCD. (4) Repeat steps (4) to (7) of ” 1 13.8V TX L power (Lower limit frequency)” described on page 32. L. DCS modulation balance (1) Press the [LAMP] or [MONI] key on the transceiver t[...]

  • Page 34

    TH-K2AT/K2E/K2ET 34 ADJUSTMENT (4) Press the [CALL] key to switch to the adjustment display. (5) When the [PTT] key is pressed to enable transmit mode, a preset DCS code (023) is internally generated and modulated. (6) Turn the encoder to change the current adjustment value and adjust DCS deviation. (7) Press the [MENU] key to write the current adj[...]

  • Page 35

    TH-K2AT/K2E/K2ET 35 ADJUSTMENT 1. Setting and Connect the optional PG-2W LCD total illumination display Initial configuration displayed after resetting DC cable to the power supply. the full-reset. DC IN terminal voltage: 13.8V 1) Total illumination display confirmation Turn the Transceiver Power ON by pressing the power switch while the [F] key is[...]

  • Page 36

    TH-K2AT/K2E/K2ET 36 ADJUSTMENT Receiver section Item Condition Measurement Adjustment Specifications/ Test equipment Unit Terminal Unit Parts Method Remarks 1. RX BPF Squelch level: 0 Adjust 1) Frequency: 145.050MHz SSG TX-RX ANT VOL Turn the VOL knob 0.63V (E, E3) Oscilloscope (A/3) SP knob to obtain 0.63V AF Frequency: 146.050MHz Distortion meter[...]

  • Page 37

    TH-K2AT/K2E/K2ET 37 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Unit Terminal Unit Parts Method Remarks Switch to Adjustment mode and carry out the operations for adjustment item D. (Refer to page 29) S-meter 3) LCD display: S1 SSG TX-RX ANT [MENU] Write Frequency: 145.050MHz (A/3) (E, E3) Frequency: 146.050MHz ([...]

  • Page 38

    TH-K2AT/K2E/K2ET 38 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Unit Terminal Unit Parts Method Remarks 8. AF output 1) Frequency: 145.050MHz SSG TX-RX ANT Check 400mW or more Check (E, E3) Oscilloscope (A/3) SP Frequency: 146.050MHz Distortion meter (K, K2, M, M2) AF V.M SSG output: –53dBm (501uV) SSG MOD: 1kH[...]

  • Page 39

    TH-K2AT/K2E/K2ET 39 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Unit Terminal Unit Parts Method Remarks Mid power Low power 2. TX power Write (DC IN terminal: 13.8V) High power Mid power Low power 6) LCD display: P7H, Frequency: 145.995MHz PTT: ON Switch to Adjustment mode and carryout the operations for adjustme[...]

  • Page 40

    TH-K2AT/K2E/K2ET 40 ANT ANT ANT MIC Encoder [MENU] Encoder [MENU] [MENU] LCD LCD VR6 VR5 Write Write Write Check Check By tuning the VR6, adjust the modulation wave until if becomes the square wave. 4.2kHz According to the larger +, –. 0.5W ±0.05W 0.8A or less All segments are lighted. ■■■■■■■■■ 4 to 6 seg- ments are lighted. ?[...]

  • Page 41

    TH-K2AT/K2E/K2ET 41 Item Condition Measurement Adjustment Specifications/ Test equipment Unit Terminal Unit Parts Method Remarks 6. MIC sensitivity Check 7. Tone deviation 8. DCS deviation 1)Frequency: 145.000MHz (E, E3) Frequency: 146.000MHz (K, K2, M, M2) PTT: O N MIC terminal input AG: 1kHz Detector: P-P/2 HPF: OFF LPF: 15kHz De-emphasis: OFF TX[...]

  • Page 42

    TH-K2AT/K2E/K2ET 42 9. VOX Sensitivity Write 10. VOX Operation Check 11. DTMF DEV Check 12. 1750Hz Tone DEV Check (E, E3 types only) 13. Protection Check (DC IN terminal: 13.8V) Switch to Adjustment mode and carry out the operations for adjustment item O. (Refer to page 34) TX power: Low 1) LCD display: VOX1 Frequency: 145.000MHz (E, E3) Frequency:[...]

  • Page 43

    TH-K2AT/K2E/K2ET 43 ADJUSTMENT / TERMINAL FUNCTION Adjustment points TX-RX unit (A/3) Component side view J2 DC IN J3 MIC J4 SP VR1 VR5 VR6 LV B LCD ANT BTEMP GND SET TX-RX UNIT (A/3) Component side view CN1 1 GND GND 2 Vol-OUT RX audio volume output 3 Vol-IN RX audio volume input 4 EN2 Encoder 2 5 GND GND 6 EN1 Encoder 1 CN2 1 SPK Internal speaker[...]

  • Page 44

    J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C20 C21 C22 C24 R210 C25 R211 C26 R212 C27 R213 R214 R215 R216 R218 C30 C33 C34 C35 C37 C38 C40 C41 C42 C43 C44 C45 R231 C46 C50 C51 C52 C203 C54 C204 C55 C56 C57 C211 C212 C213 R252 Q12 C66 Q13 Q14 R255 Q15 R257 R258 R259 C70 R260 Q20 R261 Q21 Q22 Q23 C78 Q24 R264 Q27 C85 R272 Q34 Q35 Q36 C1 Q51[...]

  • Page 45

    JKL M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 R217 R223 R224 R226 R227 R236 R237 R238 C203 2 04 R242 R243 R246 R248 3 R252 12 R260 R261 R263 R264 C85 Q31 R276 Q38 Q41 C246 C247 C248 C249 Q47 C250 C252 C253 C255 C256 Q53 C257 C258 Q55 Q57 Q59 C279 C280 C290 C291 TH1 D25 D26 D34 CP34 CP35 R328 D40 D41 R335 C300 C302 C304 C305 C306 C307 C308 R344[...]

  • Page 46

    J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 R235 R239 C297 R240 R241 C206 C20 7 R253 R254 R256 Q17 C223 C224 C226 C227 C228 C229 Q29 C230 C231 C232 C82 Q30 C235 C236 C237 C88 C238 R275 C89 C239 R277 C90 C240 C91 C241 C92 C242 C93 C94 C95 R282 C96 R283 C97 C98 R285 C99 R286 R290 R291 Q52 C281 C283 C284 C285 C286 C293 C294 C295 C298 C299 TH4[...]

  • Page 47

    JKL M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C201 C202 C205 C206 C207 C208 C209 C210 C61 C64 Q10 C65 Q11 C67 C218 C68 C69 C219 Q16 Q17 C220 C71 C221 C222 C72 C73 C223 C74 C224 C75 C225 C76 C226 C227 C228 2 9 Q29 C231 C82 C83 C84 Q30 R271 R273 Q33 C90 C2 C3 C4 C5 C6 C7 C8 C9 D1 D2 Q58 D5 D6 D8 D9 C270 C276 C282 R100 CN10 R101 R102 S D G R103 R[...]

  • Page 48

    JKL M N O P Q R S I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C20 C21 C22 C24 R210 C25 R211 C26 R212 C27 R213 R214 R215 R216 R217 R218 C30 C33 C34 C35 C37 R223 C38 R224 R226 R227 C40 C41 C42 C43 C44 C45 R231 C46 R236 R237 R238 C50 C51 C52 C203 C54 C204 C55 R242 C56 R243 C57 R246 R248 C211 C212 C213 R252 Q12 C[...]

  • Page 49

    JKL M N O P Q R S I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 R235 R239 C297 C201 C202 R240 R241 C205 C206 C207 C208 C209 C210 C61 C64 Q10 C65 Q11 C67 R253 C218 C68 R254 C69 C219 R256 Q16 Q17 C220 C71 C221 C222 C72 C73 C223 C74 C224 C75 C225 C76 C226 C227 C228 C229 Q29 C230 C231 C232 C82 C83 C84 Q30 R271 C235[...]

  • Page 50

    J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 * MIC1 +– D42 D43 D44 D46 D47 S7 PTT MENU 1/F 2/VFO 3/MR F/CALL VFO 6 5 4 7 89 MR CALL # 0 LAMP MONI J72-0883-09 (B/3) J72-0883-09 (C/3) 48 TH-K2A T/K2E/K2ET PC BOARD Component side Foil side Layer 1 Layer 2 Layer 3 Layer 4 TX-RX UNIT (X57-674X-XX) (B,C/3) Component side view (J72-0883-09 B,C/3[...]

  • Page 51

    ABCD E FG H I J 1 2 3 4 5 6 7 8 9 10 11 12 13 14 J72-0883-09 (B/3) J72-0883-09 (C/3) R230 C243 + – Q50 D G 1 2 14 13 S D48 D49 R336 R337 CN7 1 PTT KYO2 BL 5 2 KIN4 KYO1 GND 6 CN8 KIN3 KIN0 KIN2 GND MIG 8M IM KYO2 KYO1 KYO0 LAMP KIN4 KYO3 KIN1 49 PC BOARD TH-K2A T/K2E/K2ET Component side Foil side Layer 1 Layer 2 Layer 3 Layer 4 TX-RX UNIT (X57-67[...]

  • Page 52

    50 TH-K2AT/K2E/K2ET SCHEMA TIC DIAGRAM A B C D E 1 2 3 4 5 6 7 X57-674 1/5 -t 5MS 5R F1 2.5A J2 L50 D32 RB051L-40 R210 12 D31 D A221 R226 220 D40 B30-2156-05 D41 B30-2157-05 R227 100 R190 47k C236 0.01u C235 0.01u R191 47k 2SB1184(Q,R) Q37 D34 MAZS0270H C246 100u10 R217 820 R167 180k C212 0.012u R165 820k C211 2200p R144 0 C228 0.1u C207 0.01u C220[...]

  • Page 53

    TH-K2AT/K2E/K2ET SCHEMA TIC DIAGRAM F G H I J X57-674 2/5 C295 5p C294 5p C293 47p R254 1k R256 1k R253 1k CP31 3.9k Q52 RN1107 IC8 90522BPFFG139 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 COM2 62 COM3 63 VSS 64 SEG16 6[...]

  • Page 54

    TH-K2AT/K2E/K2ET SCHEMA TIC DIAGRAM R237 100k D49 B30-2237-05 R231 150 R238 1k D48 B30-2237-05 R236 1k D60 R252 100k D62 D63 D65 D64 C313 0.039u C304 1000p R239 1k R241 330k C307 0.1u R242 330k C299 1u R243 330k R240 100k C318 1000p C317 1000p R255 0 C298 1000p C300 1000p C302 1000p C305 1000p C306 1000p C308 1000p CPH3317 Q55 D69 MA2S111 D70 MA2S1[...]

  • Page 55

    TH-K2AT/K2E/K2ET SCHEMA TIC DIAGRAM 5C D16 MA2S111 C41 4.7u6.3 R36 10 R35 120k C40 0.1u R30 1.2k R31 2.2k C33 0.22u35 C35 0.1u35 KTC4082 Q23 R132 2.2k R131 330k R130 100 IC3 T A31136FN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 C174 180p R135 470k C176 0.1u C180 120p C191 0.01u 2SC5488 Q24 R134 390k R133 1k R124 3.3k C172 1800p C182 0.1u C13 0.5p (B) C[...]

  • Page 56

    TH-K2AT/K2E/K2ET SCHEMA TIC DIAGRAM Y X W V U 1 2 3 4 5 6 7 -t C83 0.01u C84 0.1u L13 R53 100 R47 5.6k D8 HSC277 D9 HSC277 IC2 NJM2904V 1 A OUT A-IN A+IN 4 GND 5 8 27 36 C109 1000p C111 1000p R77 150k (D) R76 150k (D) R74 100k (D) R75 100k (D) R78 150k (D) R79 150k (D) R80 10k R81 390k R82 27k R83 56k C110 1000p R70 0.39 R71 0.39 R72 0.39 R86 5.6k [...]

  • Page 57

    -t -t 5C 5MS 5R D16 MA2S111 C41 4.7u6.3 R36 10 R35 120k C40 0.1u R30 1.2k R31 2.2k C33 0.22u35 C35 0.1u35 KTC4082 Q23 R132 2.2k R131 330k R130 100 C83 0.01u C84 0.1u L13 R53 100 R47 5.6k D8 HSC277 D9 HSC277 IC2 NJM2904V 1 A OUT A-IN A+IN 4 GND 5 8 27 36 C109 1000p C111 1000p R77 150k (D) R76 150k (D) R74 100k (D) R75 100k (D) R78 150k (D) R79 150k [...]

  • Page 58

    TH-K2AT/K2E/K2ET 55 BPF Q9 Q11 Q16 Q10 Q12 Q17 BPF Q24 MIC AMP vco ANT FILTER 50 Ω ANT 9.74Vrms 0.84Vrms -18.68dBm 10.50dBm 4.17dBm 15.17dBm 11.00dBm 24.67dBm 20.83dBm 30.50dBm AF(1kHz) RF(145.99MHz) ANT FILTER -59.33dBm -62.50dBm -31.83dBm -47.83dBm vco -35.83dBm -17.33dBm FM IC IC3 IC6 AMP RF(145.99MHz) AF(1kHz) IF(38.85MHz) -53.00dBm 0.26Vrms [...]

  • Page 59

    TH-K2AT/K2E/K2ET 56 BLOCK DIAGRAM Q23 TCXO LOOP FILTER LPF Q6 D1, D2 Q1 Q3 SHIFT SW OSC 12.8MHz D74,D75 IC5 HPF Q30 VOX AMP Q29 , D22 , D27 MIC AGC IC16 SPLATTER FILTER LIMITTER AMP Q27 WIDE/NARR IC8 MPU 1SV325 2SC5066 (O) 2SK1830 KTC4082 2SK1830 2SC4617 (R) 2SC4919 1SS361 RB706F-40 NJM2107F NJM2904V DA221 TRIPLER 2nd Local INT S-80844 CNNBB85 I[...]

  • Page 60

    TH-K2AT/K2E/K2ET 57 BLOCK DIAGRAM J4 Q24 XF1 Q16 Q2 Q5 Q4,D7 LIPPLE FILTER RF AMP RF AMP D8, D9 Q9 Q10 Q11 Q 12 D10 LPF FINAL AMP A NT SW Q58 BIAS SW DRIVE AMP PRE-DRIVE RF AMP TX/RX SW Q17 D18,D19 D 20,D21 IC3 CD1 CF1 TA31136FN FM IC IF AMP MCF RF AMP BPF B PF SP MUTE SW AF AMP IC6 Q56 Q20 AF MUTE SW Q21 AF FILTER LPF WIDE/NARR SW Q22 Q15 SW B IC2[...]

  • Page 61

    TH-K2AT/K2E/K2ET 58 BC-21 (W ALL CHARGER) / PB-43N (Ni-MH BA TTER Y P ACK) BC-21 External View Rated output voltage ......... DC 13.8V ±5% Rated output current ......... 150mA Charging time .................... Approx. 12 hours (PB-43N) Photo is K type. BC-21 Specifications PB-43N External View PB-43N Schematic diagram T Discharge terminal side Re[...]

  • Page 62

    TH-K2AT/K2E/K2ET 59 BT -14 (BA TTERY CASE) / PG-4Y (PROGRAMMING INTERF ACE CABLE) / MCP-1A (MEMOR Y CONTROL PROGRAM) BT-14 (6 AA/LR6) External View PG-4Y External View MCP-1A • Available free for downloading from the Kenwood website: http://www.kenwood.com / i / products/info/amateur.html[...]

  • Page 63

    TH-K2AT/K2E/K2ET SPECIFICATIONS KENWOOD CORPORA TION 2967-3, Ishikawa-machi, Hachioji-shi, T okyo 192-8525, Japan KENWOOD U.S.A. CORPORA TION P .O. BOX 22745, 2201 East Dominguez Street, Long Beach, CA 90801-5745, U.S.A. KENWOOD ELECTRONICS CANADA INC. 6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8 KENWOOD ELECTRONICS DEUTSCHLAND GMBH Remb[...]