Instruction/ maintenance manual of the product K2ET Kenwood
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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 ...
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 ).
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 ).
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.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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 .
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 .
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 Lig.
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.
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.
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.
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-K2A.
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.
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-K2A.
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.
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 .
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
TH-K2AT/K2E/K2ET 41 Item Condition Measurement Adjustment Specifications/ Test equipment Unit Terminal Unit Parts Method Remarks 6. MIC sensitivity Check 7.
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.
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 v.
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 C.
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.
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 C2.
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 .
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 .
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.
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-K2.
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 .
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.
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 .
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.
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.
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.
-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.
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.
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 .
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 .
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.
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.
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.
An important point after buying a device Kenwood K2ET (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Kenwood K2ET yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Kenwood K2ET - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Kenwood K2ET you will learn all the available features of the product, as well as information on its operation. The information that you get Kenwood K2ET will certainly help you make a decision on the purchase.
If you already are a holder of Kenwood K2ET, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Kenwood K2ET.
However, one of the most important roles played by the user manual is to help in solving problems with Kenwood K2ET. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Kenwood K2ET along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
