Kenwood TH-K4AT Service Manual

Kenwood TH-K4AT Service Manual

430mhz fm transceiver
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430MHz FM TRANSCEIVER
TH-K4AT/K4E
SERVICE MANUAL
Helical Antenna
(T90-1019-25)
Knob
(PTT/LAMP/MON)
(K29-9274-03)
Key top (16key)
(K29-9272-02)
TH-K4AT
DISASSEMBLY FOR REPAIR ................................... 2
CIRCUIT DESCRIPTION ............................................ 6
SEMICONDUCTOR DATA ...................................... 14
COMPONENTS DESCRIPTION .............................. 15
PARTS LIST ............................................................. 17
EXPLODED VIEW .................................................... 23
PACKING ................................................................. 25
ADJUSTMENT ........................................................ 27
TERMINAL FUNCTION ........................................... 43
TX-RX UNIT (X57-675X-XX) (A/3) ................... 44
TX-RX UNIT (X57-675X-XX) (B/3),(C/3) .......... 48
Knob (ENC)
(K29-5159-03)
Knob (VOL)
(K29-5150-03)
Front glass
(B10-2746-03)
Cap
(SP/MIC/DC IN)
(B09-0675-03)
Cabinet assy
(16key)
(A02-3822-23)
CONTENTS
©
2003-9 PRINTED IN JAPAN
B51-8660-00 (S) 497
Helical Antenna
(T90-1019-25)
Knob
(PTT/LAMP/MON)
(K29-9274-03)
Key top (4key)
(K29-9276-02)
TH-K4E
SCHEMATIC DIAGRAM .......................................... 50
LEVEL DIAGRAM .................................................... 55
BLOCK DIAGRAM ................................................... 56
BC-21 (WALL CHARGER) ....................................... 58
PB-43N (Ni-MH BATTERY PACK) .......................... 58
BT-14 (BATTERY CASE) ......................................... 59
SPECIFICATIONS ................................. BACK COVER
Knob (ENC)
(K29-5159-03)
Knob (VOL)
(K29-5150-03)
Front glass
(B10-2746-03)
Cap
(SP/MIC/DC IN)
(B09-0675-03)
Cabinet assy
(4key)
(A02-3823-23)

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Summary of Contents for Kenwood TH-K4AT

  • Page 1: Table Of Contents

    430MHz FM TRANSCEIVER TH-K4AT/K4E SERVICE MANUAL © 2003-9 PRINTED IN JAPAN B51-8660-00 (S) 497 Helical Antenna Helical Antenna (T90-1019-25) (T90-1019-25) Knob (ENC) Knob (ENC) (K29-5159-03) (K29-5159-03) Knob (VOL) Knob (VOL) (K29-5150-03) (K29-5150-03) Front glass Front glass (B10-2746-03) (B10-2746-03) Knob Knob...
  • Page 2: Disassembly For Repair

    TH-K4AT/K4E DISASSEMBLY FOR REPAIR How to remove the case assembly from the chassis 1. Remove two screws ( ) holding the chassis. 2. Pull out two knobs ( ) and remove two round nuts ( 3. Pull out the SP and MIC parts of the cap from jacks ( 4.
  • Page 3 TH-K4AT/K4E DISASSEMBLY FOR REPAIR Soldering the antenna terminal 4. Apply the tips of soldering irons to all the four pins of the final FET at the same time ( ), heat them sufficiently, and remove 1. With the shield cover removed from the antenna terminal the final FET ( ).
  • Page 4 TH-K4AT/K4E DISASSEMBLY FOR REPAIR Special care and attention required for assembly (2) By pressing the LCD hardware fixture from the component side of the TX-RX PCB, you must bent all 4 tabs of the LCD 1. Gluing to the key top (MIC element section)
  • Page 5: Disassembly For Repair

    TH-K4AT/K4E DISASSEMBLY FOR REPAIR 4. Packing (G53-1572-02) TX/BUSY lamp installation 6. Cautions for installing the chassis on the case assembly procedure (1) Verify that the packing (G53-1572-02) TX/BUSY lamp section (1) To assure waterproofing, install the packing in the chassis is has been past through the hole in the illumination guide groove as shown in Fig.
  • Page 6: Circuit Description

    TH-K4AT/K4E CIRCUIT DESCRIPTION Frequency Configuration First Mixer The received signal passing through the band-pass filter The frequency configuration is shown in Figure 1 and (L32, L34) is mixed with the first local signal generated by the Table 1. 450kHz VCO by the first mixer (Q16) to produce a first IF signal (38.85 TX/RX : 400.000~469.995MHz(M2)
  • Page 7 TH-K4AT/K4E CIRCUIT DESCRIPTION IF Circuit FM IC and band-pass filter consisting of R125, R126, R135, The first IF signal (38.85 MHz) amplified by the IF amplifier (Q24) C173, C174. The noise component is rectified in the FM IC to and the second IF signal (38.4 MHz) generated by tripling the 12.8...
  • Page 8 TH-K4AT/K4E CIRCUIT DESCRIPTION Transmitter System The transmission/reception switching circuit consists of D10, D11, L19, D12 and D13. These diodes are turned ON in Microphone Amplifier Circuit transmit mode and OFF in receive mode to switch signals. The audio signal from the microphone passes through a high-pass filter (IC5) and enters a microphone amplifier (IC16).
  • Page 9: Circuit Description

    TH-K4AT/K4E CIRCUIT DESCRIPTION The APC voltage controls the gate voltage of Q11 and Q12, amplifying VCO output with an RF amplifier (Q6) and dividing and keeps transmission output stable. it with the PLL IC. The MPU detects power supply voltage and controls Q58 The PLL synthesizer with 5 kHz and 6.25 kHz step is...
  • Page 10 TH-K4AT/K4E CIRCUIT DESCRIPTION Power Supply Circuit Power Supply Switching Circuit The voltage supplied through the battery terminal or DC IN Charging Circuit terminal is branched in the power supply switching circuit as When an external power supply is connected to the DC IN shown in Fig.10 and then supplied to the required components.
  • Page 11 TH-K4AT/K4E CIRCUIT DESCRIPTION Voltage Detection Circuit LED Drive Circuit Various voltages are input to the A/D port of the MPU (IC8) The LCD and key illumination LEDs are lighted by controlling for processing. Q51 for the LCD and Q50 for keys according to the output Battery voltage is divided with resistors (R240, R241) and voltage from the AF/LAMP AVR (Q37).
  • Page 12 TH-K4AT/K4E CIRCUIT DESCRIPTION Key and Encoder Input Circuit The POWER key is assigned to the interrupt port (pin 95) of Other keys composes a matrix and key presses are detected the MPU. by scanning them by software. The PTT key is assigned to the dedicated port (pins 13, 14) The encoder reads data using the interrupt port (pins 35 of the MPU.
  • Page 13 TH-K4AT/K4E CIRCUIT DESCRIPTION CTCSS/DCS DTMF The encode signal is generated by the MPU (IC8) and output The DTMF signal is generated by the MPU (IC8) and is from the TONE terminal (pin 41) of the MPU. output from the DTMF/BEEP terminal (pin 40) of the MPU.
  • Page 14: Semiconductor Data

    TH-K4AT/K4E SEMICONDUCTOR DATA MPU : 90522BPFFG139 (IC8) Pin function Function Function Name Name CLOCK Common serial clock output Noise voltage input for squelch (A/D) DATA Common serial data output RSSI voltage input for S-meter (A/D) EEPDI Data input from EEPROM...
  • Page 15: Components Description

    TH-K4AT/K4E SEMICONDUCTOR DATA / COMPONENTS DESCRIPTION COMPONENTS DESCRIPTION Function Name TX-RX UNIT (X57-675X-XX) DC IN detection interrupt input ( ↓ ) DCDET L:DC IN connected Ref. No. Use/Function Operation/Condition/Compatibility RXLED Busy LED output H:ON PLL IC 100 BSFT Beat shift swiching output...
  • Page 16 TH-K4AT/K4E COMPONENTS DESCRIPTION Ref. No. Use/Function Operation/Condition/Compatibility Ref. No. Use/Function Operation/Condition/Compatibility Q33 operation On when charging switch constant-voltage DC IN detection H: DC IN detection Reverse current Battery Ni-MH temperature prevention On when temperature detection is activated detection Reverse current...
  • Page 17: Parts List

    LED(YG) D48,49 B30-2237-05 LED(YG) ∗ B62-1757-00 INSTRUCTION MANUAL(FRENCH) ∗ B62-1758-00 INSTRUCTION MANUAL(DUTCH) CK73HB1C103K CHIP C 0.010UF K B72-2131-04 MODEL NAME PLATE(TH-K4AT) ∗ ∗ CC73HCH1H390G CHIP C 39PF ∗ B72-2132-04 MODEL NAME PLATE(TH-K4E) CC73HCH1H020B CHIP C 2.0PF CK73HB1H471K CHIP C 470PF 2B,2D ∗...
  • Page 18 CHIP C 470PF C152,153 CK73HB1H471K CHIP C 470PF C242 CK73HB1C103K CHIP C 0.010UF K C156 CK73HB1H471K CHIP C 470PF C243 CK73HB1H471K CHIP C 470PF C157 ∗ CC73HCH1H180G CHIP C 18PF C246 C92-1327-05 CHIP-TAN 100UF 10WV E : TH-K4E M2 : TH-K4AT...
  • Page 19 SMALL FIXED INDUCTOR(4.7UH) C372 CK73GB1H471K CHIP C 470PF C374 CC73HCH1H101J CHIP C 100PF L40-2775-71 SMALL FIXED INDUCTOR(27NH) C510 CK73HB1A473K CHIP C 0.047UF K L92-0161-05 BEADS CORE C511 CK73HB1H471K CHIP C 470PF L92-0163-05 BEADS CORE E : TH-K4E M2 : TH-K4AT...
  • Page 20: Parts List

    1.8K J 1/16W RK73HB1J563J CHIP R J 1/16W R162 RK73HB1J274J CHIP R 270K J 1/16W R163 RK73HB1J474J CHIP R 470K J 1/16W RK73HB1J104J CHIP R 100K J 1/16W R164 RK73HB1J473J CHIP R J 1/16W E : TH-K4E M2 : TH-K4AT...
  • Page 21 CHIP R 1.0K J 1/16W R240 RK73HB1J104J CHIP R 100K J 1/16W RB521S-30 DIODE R241-243 RK73HB1J334J CHIP R 330K J 1/16W DA221 DIODE R244 R92-1252-05 CHIP R 0 OHM J 1/16W D32,33 RB051L-40 DIODE E : TH-K4E M2 : TH-K4AT...
  • Page 22 2SC4617(R) TRANSISTOR 2SK1830 2SB1184(Q,R) TRANSISTOR Q34,35 2SK1830 2SJ347 2SB1184(Q,R) TRANSISTOR 2SC4617(R) TRANSISTOR ∗ RN2105 TRANSISTOR RN1701 TRANSISTOR 2SK1830 ∗ RN4902 TRANSISTOR RN1107 TRANSISTOR ∗ RN2701 TRANSISTOR ∗ CPH3317 CPH3417 ∗ ∗ RN2105 TRANSISTOR 2SK1830 E : TH-K4E M2 : TH-K4AT...
  • Page 23: Exploded View

    TH-K4AT/K4E EXPLODED VIEW (TH-K4AT) TX-RX Unit (B/3) TX-RX Unit (C/3) TX-RX Unit (A/3) 701. STICKER 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.
  • Page 24 TH-K4AT/K4E EXPLODED VIEW (TH-K4E) TX-RX Unit (B/3) TX-RX Unit (C/3) TX-RX Unit (A/3) 701. STICKER 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.
  • Page 25: Packing

    TH-K4AT/K4E PACKING (TH-K4E) 702. PAMPHLET (R & TTE) 703. PAMPHLET 704. WARRANTY CARD 11.INSTRUCTION MANUAL (B62-1696-00) (B62-1697-00) (B62-1699-00) 41.HELICAL ANTENNA (B62-1702-00) (T90-1019-25) 42.CHARGER (230V/13.8V) (B62-1757-00) (W08-0959-05) (B62-1758-00) 43.BATTERY ASSY (7.2V/1100mAh) (W09-0991-05) 26.PACKING FIXTURE (H12-3146-01) 30. BELT HOOK ASSY (J29-0709-04) 32.HANDSTRAP (J69-0342-05) 24.ITEM CARTON CASE...
  • Page 26 TH-K4AT/K4E PACKING (TH-K4AT) 11.INSTRUCTION MANUAL (B62-1695-00) (B62-1696-00) 703. PAMPHLET 1.CABINET ASSY 32.HANDSTRAP (BATTERY CASE) (J69-0342-05) (A02-3817-02) 25.ITEM CARTON CASE (H52-1965-12) 41.HELICAL ANTENNA (T90-1019-25) 30.BELT HOOK ASSY (J29-0709-04) 27.PACKING FIXTURE (H12-3147-03) Parts with the exploded numbers larger than 700 are not supplied.
  • Page 27: Adjustment

    TH-K4AT/K4E ADJUSTMENT Single Tone Mode G. 7.5V TX M power (Lower limit frequency, center frequency, upper limit frequency) This mode is used to check the DTMF deviation. H. 7.5V TX L power (Lower limit frequency, center frequency, upper limit frequency) Operation I.
  • Page 28 TH-K4AT/K4E ADJUSTMENT Key name [key] [F] key → [key] Transmit while this key is held down. Selecting a TX power (High/Mid/Low) Changes adjustment items. (Forward) LAMP Lamp always ON When this key is pressed on the frequency display, it switches to the adjustment display.
  • Page 29 TH-K4AT/K4E ADJUSTMENT D. S-meter (Two segments in S-meter light, all segments 2RX BPF (Center frequency) in S-meter light) (1) Press the [LAMP] or [MONI] key on the transceiver to display 1S-meter (Two segments in S-meter light) “BPC” on the LCD.
  • Page 30 TH-K4AT/K4E ADJUSTMENT (8) Press the [MENU] key to write the current APC value into (5) Press the [PTT] key to enable the transmit mode. the EEPROM. (6) Adjust the output voltage from DC power supply until the voltage at the battery terminal becomes 7.5V while the 27.5V TX H power (Center frequency)
  • Page 31 TH-K4AT/K4E ADJUSTMENT (2) Press the [VFO], [MR] or [CALL] key to switch to the The current APC value is displayed at the lower digits of frequency display. the frequency display, and the value stored in the EEPROM (3) Turn the encoder to display the lower limit frequency on is displayed on the memory channel number display.
  • Page 32 TH-K4AT/K4E ADJUSTMENT J. 13.8V TX M power (Lower limit frequency, center (4) Repeat steps (4) to (7) of “113.8V TX M power (Lower frequency, upper limit frequency) limit frequency)” described on page 32. 113.8V TX M power (Lower limit frequency) (1) Press the [LAMP] or [MONI] key on the transceiver to display K.
  • Page 33 TH-K4AT/K4E ADJUSTMENT 2Tone deviation (Center frequency) (2) Press the [VFO], [MR] or [CALL] key to switch to the frequency display. (1) Press the [LAMP] or [MONI] key on the transceiver to display (3) Turn the encoder to display the upper limit frequency on “DVC”...
  • Page 34 TH-K4AT/K4E ADJUSTMENT (4) Press the [CALL] key to switch to the adjustment display. (2) Input a specified AG signal to microphone input. (5) When the [PTT] key is pressed to enable transmit mode, a (3) Press the [MENU] key to write the current microphone input preset DCS code (023) is internally generated and level value into the EEPROM.
  • Page 35 TH-K4AT/K4E ADJUSTMENT Common Section Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method 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.
  • Page 36 TH-K4AT/K4E ADJUSTMENT Receiver section Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method 1.RX BPF Squelch level: 0 Adjust 1) Frequency: 435.050MHz TX-RX Turn the VOL knob 0.63V SSG output: –53dBm (501 uV) Oscilloscope (A/3) knob to obtain 0.63V AF...
  • Page 37 TH-K4AT/K4E ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method Switch to Adjustment mode and carry out the operations for adjustment item D. (Refer to page 29) S-meter 3) LCD display: S1 TX-RX [MENU] Write Frequency: 435.050MHz...
  • Page 38 TH-K4AT/K4E ADJUSTMENT Transmitter section Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method 1.TX power Battery terminal voltage: DC power supply TX-RX Note: Do not Write (Battery 7.5V (A/3) use the DC IN Note: Adjust the output voltage from DC power supply until the voltage at the battery terminal terminal: 7.5V)
  • Page 39 TH-K4AT/K4E ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method 2.TX power Connect the optional PG-2W DC power supply TX-RX DC IN Write (DC IN DC cable to the power supply. (A/3) terminal: 13.8V) DC IN terminal voltage: 13.8V...
  • Page 40 TH-K4AT/K4E ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method To exit from the Adjustment DC power supply Check 4 to 6 seg- Mode, turn the transceiver ments are power OFF and then ON. lighted.
  • Page 41 TH-K4AT/K4E ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method 7.Tone Switch to Adjustment mode Linear detector TX-RX deviation and carry out the operations (A/3) for adjustment item M. (Refer to page 33) Detector: P-P/2...
  • Page 42 TH-K4AT/K4E ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts Method 10. VOX To exit from the Adjustment TX-RX Check Does not Operation Mode, turn the transceiver (A/3) transmit. Check power OFF and then ON. 1)Frequency: 435.000MHz...
  • Page 43: Terminal Function

    TH-K4AT/K4E TERMINAL FUNCTION CN No. Pin No. Pin Name Function TX-RX UNIT (A/3) : TX-RX↔VOL/ENC Vol-OUT RX audio volume output Vol-IN RX audio volume input Encoder 2 Encoder 1 TX-RX UNIT (A/3) : TX-RX↔Internal speaker Internal speaker audio Audio ground TX-RX UNIT (A/3) : TX-RX↔TX-RX UNIT (B/3) : 10KEY...
  • Page 44: Pc Board

    TH-K4AT/K4E PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 A/3) R252 R231 C128 R144 R143 C126 C271 R137 R131 R151 R152 DCS BAL R153 C200 C189 C188 C272 R145 C512 FREQ C114...
  • Page 45 TH-K4AT/K4E PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 A/3) C310 POWER COM0 R246 R248 COM1 COM2 COM3 R252 SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 R234 R207 SEG6 SEG7 C253 SEG8 SEG9...
  • Page 46 TH-K4AT/K4E PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 A/3) C361 R289 C100 C162 C160 R111 C158 R353 R110 C156 C165 C159 R108 CN15 CP32 CP33 R235 R310 R313 C316 C330 R318...
  • Page 47: Pc Board Tx-Rx Unit (X57-675X-Xx) (A/3)

    TH-K4AT/K4E PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 A/3) R101 R100 C144 C146 C140 C136 C137 R347 C369 C134 R348 C129 C131 C130 C363 R344 C326 C327 C202 C282 R164 R162...
  • Page 48 TH-K4AT/K4E TH-K4AT/K4E PC BOARD PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 A/3) Component side view (J72-0884-19 A/3) C310 POWER COM0 R246...
  • Page 49 TH-K4AT/K4E TH-K4AT/K4E PC BOARD PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 A/3) Foil side view (J72-0884-19 A/3) R101 R100 C144 C361...
  • Page 50 TH-K4AT/K4E PC BOARD TX-RX UNIT (X57-675X-XX) (B,C/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 B,C/3) MIC1 MENU – 2/VFO 3/MR F/CALL CALL J72-0884-19 (B/3) MONI LAMP J72-0884-19 (C/3) Ref. No. Address Component side Layer 1 Layer 2...
  • Page 51 TH-K4AT/K4E PC BOARD TX-RX UNIT (X57-675X-XX) (B,C/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 B,C/3) C243 KIN3 KYO2 KIN0 KYO1 KIN2 KYO0 – LAMP KIN4 KYO3 KIN1 R337 R230 J72-0884-19 (B/3) C374 J72-0884-19 (C/3) Ref. No. Address...
  • Page 52 TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) VOLIN VOLIN QT/DQT ENCA ENCA ENCB ENCB SIGIN R170 2.02V T:0V R:4.90V TX LED BUSY LED C331 R158 T:73mV T:3.29V R165 330k 470p R:3.39V R:110mV 820k TX/BUSY IC17 LED SW NJM2904V R167 R324 C349...
  • Page 53 TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) VOLIN VOLIN QT/DQT QT/DQT ENCA ENCA TEMP ENCB ENCB FINAL SIGIN LCD (B38-0881-05) KAPC DATA CLOCK SHIFT PLLLD PLLEN RXLED TEMP LAMP 5MS SW TONE DTMF/BEEP R342 VOXIN R283 R343 R282 BATT COM0 C336...
  • Page 54: Tx-Rx Unit (X57-675X-Xx) (A/3)

    TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) VOLIN VOLIN QT/DQT QT/DQT TEMP TEMP FINAL FINAL KAPC KAPC DATA DATA CLOCK CLOCK SHIFT SHIFT PLLLD PLLLD PLLEN PLLEN C316 R237 100k 0.1u EEPROM T:4.95V T:0V 5.0V AVR 5C SW R:0V R:4.90V 5MS SW...
  • Page 55: Schematic Diagram

    TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) VOLIN QT/DQT TEMP TEMP FINAL FINAL KAPC KAPC DATA CLOCK SHIFT PLLLD CN15 CN17 PLLEN D1-4 VCO FREQUENCY CONTROL C8 5p (B) 150k 2SC5488 HVC376B 2SC5488 R346 2SK508NV(52K) 270n 39p (G) 0.5p HVC376B RF AMP...
  • Page 56 TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) 10.37V T:4.31V T:4.86V C329 R:0V R:0V C364 C326 C65 10p R271 4.7n 470p 1.98V RF AMP 470p C363 RF SW 2SK2596 2SC5488 DRIVE R347 1.43V DRIVE HSC277 2.03V 2SC4926YD HSC277 RF SW 3.3k 2SC4617(R) VOLTAGE 4.91V...
  • Page 57 TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) VOLIN VOLIN VOLIN VOLIN VOLIN VOLIN VOLIN T:4.31V T:4.86V 10.37V R:0V R:0V C364 C329 C65 10p R271 C326 4.7n RF AMP 1.98V 470p QT/DQT QT/DQT QT/DQT QT/DQT QT/DQT QT/DQT 470p C363 RF SW 2SK2596...
  • Page 58: Level Diagram

    TH-K4AT/K4E LEVEL DIAGRAM...
  • Page 59: Block Diagram

    TH-K4AT/K4E BLOCK DIAGRAM TONE DTMF/BEEP IC16 1SV278 NJM2107F NJM2904V LIMITTER AMP SPLATTER FILTER 2SK508NV (52K) D1 , 2 , 3 , 4 HVC376B 2SC5488 Q29,D22,D27 2SC4617(R) 2SK1830 D74 , D79 2SC4919 DA221 1SS361 VOX AMP RF AMP WIDE/NARR RB706F-40 LIMITTER...
  • Page 60 TH-K4AT/K4E BLOCK DIAGRAM D8, D9 D10,11 HSC277 2SK3476 2SC5488 2SC5488 2SC4926YD 2SK2596 2SC5488 HVC131 PRE-DRIVE RF AMP RF AMP TX/RX SW DRIVE AMP FINAL AMP ANT SW RF AMP D12,D13 Q4,D7 RN4902 HVC131 2SC4617(R) 2SK1830 ANT SW B57331V APC SW...
  • Page 61: Bc-21 (Wall Charger)

    TH-K4AT/K4E 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% PB-43N Schematic diagram Rated output current ..150mA Charging time ....Approx. 12 hours (PB-43N)
  • Page 62: Battery Case)

    TH-K4AT/K4E 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.html...
  • Page 63: Specifications

    13, Boulevard Ney, 75018 Paris, France Sales Marketing Division KENWOOD ELECTRONICS U.K. LIMITED 1 Ang Mo Kio Street 63, Singapore 569110 KENWOOD House, Dwight Road, Watford, Herts., WD18 9EB, United Kingdom KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands...

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