44MHz FM TRANSCEIVER TH-K2AT/K2E/K2ET SERVICE MANUAL © 2003-8 PRINTED IN JAPAN B51-8658-00 (S) 836 Helical Antenna (T90-1018-25) Helical Antenna (T90-1018-25) Knob (ENC) (K29-5159-03) Knob (ENC) (K29-5159-03) Knob (VOL) (K29-5150-03) Front glass (B10-2746-03) Knob (PTT/LAMP/MON) (K29-9274-03) Cap (SP/MIC/DC IN) (B09-0675-03) Cabinet assy (16key) (A02-3819-23) Knob (VOL) (K29-5150-03) Front glass (B10-2746-03) Knob (PTT/LAMP/MON) (K29-9274-03) Cap (SP/MIC/DC IN) (B09-0675-03) Cabinet assy (4key)
TH-K2AT/K2E/K2ET DISASSEMBLY FOR REPAIR How to remove the case assembly from the chassis c Remove two screws (z) holding the chassis. Pull out two knobs (x) and remove two round nuts (c). Pull out the SP and MIC parts of the cap from jacks (v). Turn the unit over with the bottom of the chassis facing upwards, and remove the chassis ( n ) from the case assembly (b). 5. Remove the speaker lead (m) from the connector (CN2) of the TX-RX PC board (TX-RX unit A/3). 1. 2. 3. 4.
TH-K2AT/K2E/K2ET DISASSEMBLY FOR REPAIR 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). 4. Apply the tips of soldering irons to all the four pins of the final FET at the same time (c), heat them sufficiently, and remove the final FET (v). (Two persons should be required to do this.) v x c z 5.
TH-K2AT/K2E/K2ET DISASSEMBLY FOR REPAIR 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.
TH-K2AT/K2E/K2ET DISASSEMBLY FOR REPAIR 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) Install the packing TX/BUSY lamp section on the chassis. (x ) z 6. Cautions for installing the chassis on the case assembly (1) Verify that the packing (G53-1572-02) TX/BUSY lamp section is has been past through the hole in the illumination guide section on the top of the case assembly. (Fig.
TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Frequency Configuration The frequency configuration is shown in Figure 1 and Table 1. RX : 136.000~173.995MHz(K,K2,M,M2) 144.000~145.995MHz(E,E3) TX : 144.000~147.995MHz(K,K2) 136.000~173.995MHz(M,M2) ANT 144.000~145.995MHz(E,E3) 1st MIX ANT SW ■ First Mixer 450kHz CF SP MCF RF AMP MIX, IF, DET 38.85MHz AF AMP 38.4MHz FINAL 174.850~212.845MHz (K,K2,M,M2) 182.850~184.
TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION ■ IF Circuit FM IC and band-pass filter consisting of R125, R126, R135, C173, C174. The noise component is rectified in the FM IC to produce a DC voltage, which is output from the N-REC terminal (pin 14) of the FM IC as squelch voltage. The squelch voltage enters the SQ terminal (pin 48) of the MPU (IC8) and is compared with the reference voltage preset in the MPU to control audio signal ON/OFF.
TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Transmitter System The transmission/reception switching circuit consists of D10, L19, D12 and D13. These diodes are turned ON in transmit mode and OFF in receive mode to switch signals. ■ 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 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. 10.5 V and if power is at Mid or Low level, the APC voltage level applied to Q12 is reduced by Q58.
TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Power Supply Circuit ■ Power Supply Switching Circuit ■ Charging Circuit The voltage supplied through the battery terminal or DC IN terminal is branched in the power supply switching circuit as shown in Fig.10 and then supplied to the required components. 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 NiMH battery.
TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION ■ Voltage Detection Circuit ■ LED Drive 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 power supply voltage (approx. 16.5 V or higher) is applied.
TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION ■ 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. Other keys composes a matrix and key presses are detected by scanning them by software. The encoder reads data using the interrupt port (pins 35 and 36) of the MPU.
TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION ■ CTCSS/DCS ■ DTMF 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 modulation levels are adjusted by VR6 to produce flat modulation characteristics in low and high ranges.
TH-K2AT/K2E/K2ET SEMICONDUCTOR DATA MPU : 90522BPFFG139 (IC8) ■ Pin function Pin No.
TH-K2AT/K2E/K2ET SEMICONDUCTOR DATA / COMPONENTS DESCRIPTION Pin No.
TH-K2AT/K2E/K2ET COMPONENTS DESCRIPTION Ref. No.
TH-K2AT/K2E/K2ET PARTS LIST indicates safety critical components. ∗ New Parts. 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 Y: PX (Far East, Hawaii) Y: AAFES (Europe) K: USA T: England X: Australia P: Canada E: Europe M: Other Areas TH-K2AT/K2E/K2ET (Y50-580X-XX) TX-RX UNIT (X57-674X-XX) New Ref. No. Address parts Parts No.
TH-K2AT/K2E/K2ET PARTS LIST TX-RX UNIT (X57-674X-XX) New Parts No. Ref. No. Address parts Description Destination New Ref. No. Address parts Parts No. Description C33 C34 C35 C37 C38 C92-0002-05 C92-0714-05 C92-0001-05 CK73HB1H102K CK73HB1C103K CHIP-TAN TANTALUM CHIP-C CHIP C CHIP C 0.22UF 4.7UF 0.1UF 1000PF 0.010UF 35WV 6.3WV 35WV K K C136 C137 C138 C141,142 C145 CC73HCH1H100D CC73HCH1H050C CK73HB1H102K CK73HB1H102K CC73HCH1H220G CHIP C CHIP C CHIP C CHIP C CHIP C 10PF 5.
TH-K2AT/K2E/K2ET PARTS LIST TX-RX UNIT (X57-674X-XX) New Ref. No. Address parts Parts No. Description Destination New Ref. No. Address parts C230 C231,232 C235,236 C237 C238-241 CK73FB1C105K CK73HB1H102K CK73HB1C103K C92-0628-05 CK73HB1H102K CHIP C CHIP C CHIP C CHIP-TAN CHIP C 1.0UF 1000PF 0.010UF 10UF 1000PF K K K 10WV K C359,360 C366 C500,501 C502 C503 C242 C243 C246 C247,248 C249 CK73HB1C103K CK73HB1H102K C92-1327-05 CK73HB1A104K CK73HB1H102K CHIP C CHIP C CHIP-TAN CHIP C CHIP C 0.
TH-K2AT/K2E/K2ET PARTS LIST TX-RX UNIT (X57-674X-XX) New Parts No. Ref. No. Address parts Description Destination New Ref. No. Address parts Parts No. Description Destination L41-1078-14 L41-2278-14 L41-8285-14 L92-0140-05 L40-4795-85 SMALL FIXED INDUCTOR SMALL FIXED INDUCTOR SMALL FIXED INDUCTOR FERRITE CHIP SMALL FIXED INDUCTOR(4.7UH) R70-72 R74,75 R76-79 R80 R81 RK73EB2ER39K RK73HH1J104D RK73HH1J154D RK73HB1J103J RK73HB1J394J CHIP R RESISTOR RESISTOR CHIP R CHIP R 0.
TH-K2AT/K2E/K2ET PARTS LIST TX-RX UNIT (X57-674X-XX) New Ref. No. Address parts Parts No. Description Destination New Ref. No. Address parts Parts No. Description Destination R160 R161 R162 R163 R164 RK73HB1J472J RK73HB1J102J RK73HB1J184J RK73HB1J564J RK73HH1J103D CHIP R CHIP R CHIP R CHIP R CHIP R 4.7K 1.
TH-K2AT/K2E/K2ET PARTS LIST TX-RX UNIT (X57-674X-XX) New Parts No. Ref. No.
TH-K2AT/K2E/K2ET EXPLODED VIEW (TH-K2AT / K2ET) B A C 7 35 3 B 34 6 1 40 29 D 36 16 D TX-RX Unit (B/3) 10 D 37 8 31 Dx2 Gx2 D D TX-RX Unit (C/3) 17 Ex2 D E D Dx2 19 18 9 D 15 23 33 2 TX-RX Unit (A/3) 28 39 14 Ax2 22 13 21 E 45 E 4 Fx2 701. STICKER 3 1 (K2, M2) 5 702. STANDARD LABEL : K, K2 12 A : N09-1492-05 B : N14-0569-04 C : N14-0573-04 D : N79-2035-46 E : N79-2040-45 F : N82-2007-46 G : N09-2433-05 Parts with the exploded numbers larger than 700 are not supplied.
TH-K2AT/K2E/K2ET EXPLODED VIEW (TH-K2E) D C C 7 35 2 B 34 6 1 40 38 29 D 16 D TX-RX Unit (B/3) 10 D 37 8 31 Dx2 Gx2 D D TX-RX Unit (C/3) 17 Ex2 D E D Dx2 19 18 9 D 15 23 33 2 TX-RX Unit (A/3) 28 39 14 Ax2 22 13 21 45 E E 4 5 Fx2 3 701. STICKER 12 A : N09-1492-05 B : N14-0569-04 C : N14-0573-04 D : N79-2035-46 E : N79-2040-45 F : N82-2007-46 G : N09-2433-05 24 Parts with the exploded numbers larger than 700 are not supplied.
TH-K2AT/K2E/K2ET PACKING (K, M, E and E3 types) F E 703. PAMPHLET (R & TTE) : E, E3 704. PAMPHLET 705. WARRANTY CARD : K, E, E3 1 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 42.CHARGER (230V/13.8V) (W08-0959-15) : M, E, E3 41.HELICAL ANTENNA (T90-1018-25) 43.CHARGER (120V/13.8V) (W08-0960-15) : K 2 44.BATTERY ASSY (7.2V/1100mAh) (W09-0991-05) 26.PACKING FIXTURE (H12-3146-01) 30.
TH-K2AT/K2E/K2ET PACKING (K2 and M2 types) H G 11.INSTRUCTION MANUAL (B62-1695-00):M2 (B62-1696-00) (B62-1697-00):K2 1 704. PAMPHLET 705. WARRANTY CARD : K2 2 32.HANDSTRAP (J69-0342-05) : M2 1.CABINET ASSY (BATTERY CASE) (A02-3817-02) 25.ITEM CARTON CASE (H52-2009-02) 41.HELICAL ANTENNA (T90-1018-25) 30.BELT HOOK ASSY (J29-0709-04) 27.PACKING FIXTURE (H12-3147-03) 3 26 Parts with the exploded numbers larger than 700 are not supplied.
TH-K2AT/K2E/K2ET 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 single tone is consisting of eight frequencies. [1] 697Hz [2] 770Hz [3] 852Hz [4] 941Hz [5] 1209Hz [6] 1336Hz [7] 1477Hz [8] 1633Hz 4.
TH-K2AT/K2E/K2ET ADJUSTMENT Key name PTT LAMP MONI MENU F VFO MR CALL Encoder [key] Transmit while this key is held down. Changes adjustment items. (Forward) When this key is pressed on the frequency display, it switches to the adjustment display. Changes adjustment items. (Back) When this key is pressed on the frequency display, it switches to the adjustment display.
TH-K2AT/K2E/K2ET ADJUSTMENT D. S-meter (Two segments in S-meter light, all segments in S-meter light) 1S-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 displayed on the memory channel number display. (2) Press the [MENU] key to write the current RSSI level value into the EEPROM.
TH-K2AT/K2E/K2ET ADJUSTMENT (8) Press the [MENU] key to write the current APC value into the EEPROM. 27.5V 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 encoder to display the center frequency on the LCD. (4) Repeat steps (4) to (8) of ”17.5V TX H power (Lower limit frequency)” described on page 29. 37.
TH-K2AT/K2E/K2ET ADJUSTMENT (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 at the battery terminal becomes 7.5V while the transceiver is transmitting.
TH-K2AT/K2E/K2ET ADJUSTMENT J. 13.8V TX M power (Lower limit frequency, center frequency, upper limit frequency) 113.8V 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 display, and the value stored in the EEPROM is displayed on the memory channel number display.
TH-K2AT/K2E/K2ET ADJUSTMENT (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 ”113.8V TX L power (Lower limit frequency)” described on page 32. L. DCS modulation balance (1) Press the [LAMP] or [MONI] key on the transceiver to display “DCS.BAL” on the LCD. Press the [F] key and then the [PTT] key repeatedly to turns the “ ” icon ON.
TH-K2AT/K2E/K2ET 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 adjustment value into the EEPROM. 2DCS deviation (Center frequency) (1) Press the [LAMP] or [MONI] key on the transceiver to display “DVC” on the LCD.
TH-K2AT/K2E/K2ET ADJUSTMENT Common Section Item Condition Measurement Test equipment Unit Adjustment Terminal Unit Parts Method Specifications/ Remarks 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 pressed.
TH-K2AT/K2E/K2ET ADJUSTMENT Receiver section Item 1.RX BPF Adjust Condition Squelch level: 0 1) Frequency: 145.050MHz (E, E3) Frequency: 146.050MHz (K, K2, M, M2) SSG output: –53dBm (501 uV) SSG MOD: 1kHz SSG DEV: 3kHz Switch to Adjustment mode and carry out the operations for adjustment item E. (Refer to page 29) 2) LCD display: BPL Frequency: 136.050MHz SSG: –119dBm (0.25 uV) 3) SSG: –113dBm (0.501 uV) Measurement Test equipment Unit SSG Oscilloscope Distortion meter AF V.
TH-K2AT/K2E/K2ET ADJUSTMENT Item Condition Switch to Adjustment mode and carry out the operations for adjustment item D. (Refer to page 29) S-meter 3) LCD display: S1 Frequency: 145.050MHz (E, E3) Frequency: 146.050MHz (K, K2, M, M2) SSG: –120dBm (0.22uV) 4) LCD display: S9 Frequency: 145.050MHz (E, E3) Frequency: 146.050MHz (K, K2, M, M2) SSG: –105dBm (1.26uV) 4.Squelch Squelch level: 1 Check 1) Frequency: 145.050MHz (E, E3) Frequency: 146.050MHz (K, K2, M, M2) SSG output: –123dBm (0.
TH-K2AT/K2E/K2ET ADJUSTMENT Item 8.AF output Check 9.Current Drain Check Condition 1) Frequency: 145.050MHz (E, E3) Frequency: 146.050MHz (K, K2, M, M2) SSG output: –53dBm (501uV) SSG MOD: 1kHz SSG DEV: 3kHz AF distortion: 10% Squelch level: 5 1) Frequency: 145.050MHz (E, E3) Frequency: 146.050MHz (K, K2, M, M2) SSG output: OFF 2) Frequency: 145.050MHz (E, E3) Frequency: 146.
TH-K2AT/K2E/K2ET ADJUSTMENT Item Mid power Low power Condition 6) LCD display: P7H, Power meter Frequency: 145.995MHz Am meter PTT: ON Switch to Adjustment mode and carryout the operations for adjustment item H. (Refer to page 30) 7)LCD display: P7L, Frequency: 144.000MHz PTT: ON 8)LCD display: P7C, Frequency: 145.000MHz PTT: ON 9)LCD display: P7H, Frequency: 145.995MHz PTT: ON 2.TX power Connect the optional PG-2W Write (DC IN DC cable to the power supply. terminal: 13.8V) DC IN terminal voltage: 13.
TH-K2AT/K2E/K2ET ADJUSTMENT Item Low power 3.Battery terminal reference voltage Adjust/ Check Condition 8) LCD display: P13C, Frequency: 145.000MHz PTT: ON 9) LCD display: P13H, Frequency: 145.995MHz PTT: ON Switch to Adjustment mode and carry out the operations for adjustment item B. (Refer to page 28) TX power: Low 1)LCD display: BAT Frequency: 145.000MHz (E, E3) Frequency: 146.
TH-K2AT/K2E/K2ET ADJUSTMENT Item 6.MIC sensitivity Check 7.Tone deviation 8.DCS deviation Condition 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 power: Low 1)Frequency: 145.000MHz (E, E3) Frequency: 146.
TH-K2AT/K2E/K2ET ADJUSTMENT Item 9.VOX Sensitivity Write 10. VOX Operation Check 11. DTMF DEV Check 12. 1750Hz Tone DEV Check (E, E3 types only) 42 Condition Measurement Test equipment Unit Terminal Switch to Adjustment mode AG 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: 146.000MHz (K, K2, M, M2) AG: 1kHz/80mV 2)LCD display: VOX9 Frequency: 145.000MHz (E, E3) Frequency: 146.
TH-K2AT/K2E/K2ET ADJUSTMENT / TERMINAL FUNCTION TERMINAL FUNCTION Adjustment points TX-RX unit (A/3) Component side view CN No. Pin No.
A 1 B C D E TH-K2AT/K2E/K2ET F G H I J PC BOARD 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 C318 C85 C328 R86 Q59 D S G C351 C331 R77 R264 R72 R71 R70 F1 F3 R261 1 7 R165 14 R259 R257 R166 8 C321 R171 72 R17 R1 R258 D80 C506 C212 R157 C204 C203 R158 R168 C339 C349 R324 R167 R159 C211 C350 R210 J2 DC IN C320 R260 IC17 C106 R211 44 14 R344 + C213 Ref. No. Address Ref. No.
J K L M N O PC BOARD P Q R S 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 6 GND KYO1 2 KIN4 BL 5 PTT 1 KYO2 C310 R246 C313 C312 CN6 POWER 1 R248 3 COM0 COM1 LCD C318 COM2 COM3 R252 SEG0 SEG1 R335 4 ANT SEG2 SEG3 SEG4 C256 R208 R209 R223 C257 C258 R263 1 C290 IC15 + SEG19 4 7 4 3 Q47 5 1 SEG18 5 C279 SEG20 Q37 C R238 SEG21 D S G C331 SEG23 R236 C360 C300 R244
A 1 B C D E TH-K2AT/K2E/K2ET F G H I J 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 2 R103 R111 S G C158 R110 R102 L40 C502 R345 C159 L18 R62 R61 C89 4 C152 R291 D10 C153 R104 C160 D L38 D20 L19 C94 C163 L20 L22 Q17 C162 R290 L21 C98 C92 D21 C504 L41 D13 D12 C93 D17 C95 C97 C99 C101 C100 L23 3 C96 C90 CN15 C91 R312 R256 R254 R253 R285 C88 CP32 CP33 R235 R277 C503 C366
J K L M N O P Q R S TH-K2AT/K2E/K2ET PC BOARD 1 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 2 C147 C5 C6 D S Q3 3 LV C2 R13 C8 C7 C9 R7 D1 L6 D6 R8 C3 C10 R22 L5 R9 C131 L3 4 Q1 R42 R52 L27 L56 C65 L10 L26 C74 L55 5 3 R51 Q10 R88 C67 C326 L54 R54 G S D S D G Q58 R59 CN10 C73 4 B C324 L12 1 R271 R60 L14 R39 C69 C72 R64 D2 R49 2 C366 R14 R10 R15 C13 C64 C130 C503 R346
A 1 B C D E TH-K2AT/K2E/K2ET F G H I J K L M N PC BOARD O PC BOARD 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 P Q R S 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 GND C313 C312 BL 5 KYO2 PTT 1 C318 R335 C256 R263 1 C279 C 5 R238 SEG21 C246 D S G C351 R77 C331 E SEG23 R236 C360 C300 R244 4 6 R72 R71
A 1 B C D E TH-K2AT/K2E/K2ET F G H I J K L M N PC BOARD O P R S 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 Q 1 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 2 2 C147 C5 C6 D S G Q3 4 Q9 R42 R52 C65 5 3 4 C67 L54 R54 R271 C326 B C324 C69 R39 G S D S D G Q58 R59 CN17 CN10 3 R53 6 L11 C68 C71 Q11 L13 C
A 1 2 B C D E TH-K2AT/K2E/K2ET F G H I J PC BOARD TX-RX UNIT (X57-674X-XX) (B,C/3) Component side view (J72-0883-09 B,C/3) 0-11 : K,K2 0-21 : M,M2 2-71 : E 2-72 : E3 3 MIC1 MENU + – D42 4 1/F 5 2/VFO 3/MR D43 F/CALL D46 4 5 6 VFO 7 8 9 MR 6 7 D47 D44 8 * 0 # CALL 9 J72-0883-09 (B/3) 10 MONI LAMP S7 PTT 11 J72-0883-09 (C/3) Ref. No.
A B C D E PC BOARD F G H I J TH-K2AT/K2E/K2ET TX-RX UNIT (X57-674X-XX) (B,C/3) Foil side view (J72-0883-09 B,C/3) 0-11 : K,K2 0-21 : M,M2 2-71 : E 2-72 : E3 1 2 3 CN8 C243 – 14 KIN3 KIN0 KIN2 GND MIG 8M 2 IM + KYO2 13 KYO1 KYO0 LAMP KIN4 KYO3 KIN1 1 Q50 G D S R336 4 5 R337 6 7 R230 8 9 J72-0883-09 (B/3) 10 2 KIN4 KYO1 6 GND PTT 1 BL 5 KYO2 D48 D49 CN7 11 J72-0883-09 (C/3) Ref. No.
A B C D TH-K2AT/K2E/K2ET E SCHEMATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) 1 MOD VOLIN MOD VOLIN 5MS 5MS 5T NAR TO QT/DQT NAR TO QT/DQT 5R 5C ENCA ENCB ENCA ENCB 8 B30-2157-05 100 D40 R171 R226 220 Q47 RN1701 7 * C321 R167 180k 120k 9 R168 R324 180k 47k C212 0.012u 0.047u 6 * GND 820k 10 V+ 2200p 5 R159 820k 4 C320 C339 11 C331 1000p TX/BUSY LED SW C349 0.
F G H I J TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) MOD VOLIN MOD VOLIN 5MS 5T 5MS 5T +B NAR TO QT/DQT 5R 5C TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV 5MV 5M +B NAR TO QT/DQT 5R 5C ENCA ENCB ENCA ENCB SEG30 SEG31 36 35 SEG30 SEG31 SEG28 SEG29 34 SEG29 SEG27 33 SEG28 SEG26 32 31 SEG26 SEG27 SEG24 SEG25 30 29 SEG24 SEG25 SEG22 SEG23 28 SEG23 SEG20 SEG19 SEG18 SEG17 SEG16 SEG21 SEG22 27 SEG21 26 SEG20 25 SEG19 24 SEG18 23 2
K L M N TH-K2AT/K2E/K2ET O SCHEMATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) MOD VOLIN MOD VOLIN 5MS 5T +B NAR TO QT/DQT 5R 5C TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV 5MV 5M 5MS 5T +B NAR TO QT/DQT 5R 5C TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV C316 1 5T SW Q55 CPH3317 1000p C347 1000p 470k C345 R328 5R/5MV SW 10u10 5MS SW LAMP T:4.95V R:0V Q53 RN2701 VOUT IC12 TK11250CUCB NP GND CONT C346 T:0V R:4.90V 5.01V C330 SI IC15 AT25160N10SI27 T:4.
P Q R S T TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) MOD VOLIN 5MS 5T +B NAR TO QT/DQT 5R 5C TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV 5T +B TEMP FINAL KAPC CN15 * CN17 C55 L9 R18 10 82n 3.3k R17 C18 1000p C17 1000p 1k R20 C21 1 IC1 LMX2316TMX VP VCC2 16 4.7u6.3 1000p C41 C42 C43 0.01u C44 100p C45 100p 10p C46 100p 22p 10p C51 C52 X1 L77-1931-05 L64 4.7u KAPC TEMP 10 5C CP2 3.
U V W X TH-K2AT/K2E/K2ET Y SCHEMATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) R54 100 39p 22n L56 33p L14 C76 6.8n C74 L15 56p C72 C73 1000p C71 0.1u 1000p L13 56n R56 R55 C329 1000p DRIVE AMP C327 1k 470 1u L54 C69 R39 R41 L11 C70 Q11 2SK2596 10n C75 10n 47n L12 L55 0.1u 1000p 4p 82n 100 C67 12 1.30V 3.3k D73 VOLTAGE DROP Q10 OPERATION SW MA2S111 1u C66 C324 4.
TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) 4 Q33 OPERATION SW BTEMP CHARGE 5M +B * +B 0 # CALL Q50 2SK1830 BOARD D73 39p 22n C76 L56 C74 33p L14 47n 0.1u L23 9T 24p (G) C101 (G) C99 C95 C97 (G) 12p 12p (G) L19 1000p C92 HVC131 D13 D12 HVC131 8p 1000p C93 R86 5.6k -t 1000p TH1 1000p C118 10u4 D15 MA8039 C117 C116 10k TEMP COMPENSATION 560 APC OUTPUT VOLTAGE LIMITTER 1000p C115 Q14 RN4902 APC MA2S111 C114 0.
9.74Vrms -53.00dBm ANT ANTFILTER BPF 0.84Vrms MIC AMP IC16 Receiver Section MIC AF(1kHz) Transmitter Section -18.68dBm -62.50dBm Q17 Q10 -31.83dBm BPF 11.00dBm Q11 -35.83dBm Q24 20.83dBm Q12 30.50dBm ANTFILTER ANT 50Ω 0.26Vrms SP 0.58Vrms 12.09mVrms 0.66Vrms AMP IC6 All voltage levels must be measured after setting the AF output voltage at 0.58V rms. The RF and IF sections are measured by using a spectrum analyzer.
TH-K2AT/K2E/K2ET BLOCK DIAGRAM VR6 TONE DTMF/BEEP VR5 D6 1SV305 IC16 NJM2904V IC5 NJM2107F MOD LIMITTER AMP SPLATTER FILTER HPF Q1 2SC5066 (O) OSC 5C 5T D1, D2 1SV325 5MV Q29,D22,D27 2SC4919 1SS361 RB706F-40 MIC AGC D74,D75 DA221 LIMITTER J3 Q30 2SC4617(R) Q27 2SK1830 Q6 2SC5488 VOX AMP WIDE/NARR SW RF AMP Q3 2SK1830 D24 MA742 PTTE/RXD 5MV MICM NAR SHIFT SW VOX DET LOOP FILTER LPF SHIFT D42,43,46 D44,47 B30-2205-05 IC1 LMX2316TMX 2nd Local PLL IC KEY ILLMI TCXO Q23 KTC4082
TH-K2AT/K2E/K2ET BLOCK DIAGRAM B LPF Q2 2SC5488 Q5 2SC5488 D8, D9 HSC277 Q9 2SC5488 Q10 2SC4926YD Q11 2SK2596 Q12 2SK3476 D10 XB15A709 RF AMP RF AMP TX/RX SW RF AMP PRE-DRIVE AMP DRIVE AMP FINAL AMP ANT SW 5R 5C ANT 5T Q4,D7 TH1 B57331V 2103J LIPPLE FILTER D12,D13 HVC131 Q14 RN4902 Q15 2SC4617(R) Q58 2SK1830 APC SW APC KILL SW SW ANT SW BIAS SW TEMP DET FINAL Q13 2SK1830 CF1 450kHz 5C D17 HSM88AS IC2 NJM2904V D14 MA2S111 5T SW APC AMP ANT SW 5R APC V Q16 3SK318 XF1
TH-K2AT/K2E/K2ET BC-21 (WALL CHARGER) / PB-43N (Ni-MH BATTERY PACK) BC-21 External View PB-43N External View Photo is K type. BC-21 Specifications Rated output voltage ......... DC 13.8V ±5% Rated output current ......... 150mA Charging time .................... Approx.
TH-K2AT/K2E/K2ET BT-14 (BATTERY CASE) / PG-4Y (PROGRAMMING INTERFACE CABLE) / MCP-1A (MEMORY 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.
TH-K2AT/K2E/K2ET SPECIFICATIONS General TH-K2AT Market code K, K2 Number of memory channels 100 (50) + 9 special function memories Antenna impedance (Connector type) 50 Ω (SMA) Operating Voltage DC IN Jack Battery terminal Grounding method Current TH-K2E E M, M2 TH-K2ET E3 100 (50) + 8 special function memories DC 12.0 ~ 16.0 V (13.8 V nominal) DC 6.0 ~ 9.0 V (7.2 V nominal) Negative ground Transmit with H, 13.8 V (DC IN) 1.8 A or less Transmit with H, 7.2 V (PB-43N) 2.
