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KENWOOD TK360G
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of KENWOOD TK360G Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 20 (click to view)
TK-360G/370G
CIRCUIT DESCRIPTION
3) UNLOCK DETECTOR
If a pulse signal appears at the LD pin of IC2, an unlock condition occurs, and the DC voltage obtained form D1, R1, and C6 causes the voltage applied to the microprocessor to go low. When the microprocessor detects this condition, the transmitter is disabled, ignoring the push-to-talk switch input signal.(See Fig. 6)
5C
From T/R SW (D5) Q5 Pre-DRIVE AMP +B Q6 DRIVE AMP IC1 RF POWER AMP VDD R56 R57 R58 APC (IC13) IC3 (1/2) IC3 (2/2) VGG D3 ANT SW LPF ANT

IC2 D1 LD PLL IC

R1

IC13 UL

Fig. 8 Drive and final amplifier and APC circuit

C6

MPU

3) APC circuit
The APC circuit always monitors the current flowing through the RF power amplifier (IC1) and keeps a constant current. The voltage drop at R56, R57 and R58 is caused by the current flowing through the RF power amplifier and this voltage is applied to the differential amplifier IC3(1/2). IC3(2/2) compares the output voltage of IC3(1/2) with the reference voltage from IC13, and the output of IC3(2/2) controls the VGG of the RF power amplifier to make both voltages the same. The change of power high/low is carried out by the change of the reference voltage.

Fig. 6 Unlock detector circuit

4. Transmitter System
1) Microphone amplifier
The signal from the microphone passes through the limiter circuit in D23, and through the high-pass filter, the ALC circuit, the low-pass filter, the high-pass filter, and preemphasis/IDC circuit IC14. When encoding DTMF, the mute switch (Q35) is turned OFF for muting the microphone input signal. The signal passes through the D/A converter (IC17) for the maximum deviation adjustment, and goes to the VCXO modulation input.
MUTE Q35 SW MIC D23 LIMIT 12 IC14 HPF 15 ALC 16 18 19 LPF 9 HPF DTMF/ 2 TONE

4) Encode signaling
(1) QT/DQT QT,DQT data of the TOTCXO Line is output form pin 20 of the CPU. The signal passes through a low-pass CR filter and goes to the TCXO(X1). The QT,DQT data of the TOVCO Line is output form pin 22 of the CPU. The signal passes through a low pass CR filter, mixes with the audio signal, and goes to the VCO modulation input. TX deviation is adjusted by the CPU. (See fig.7) (2) DTMF/2 TONE

8 PRE EMP IDC 6

COMP

IC17 D/A LPF QT/DQT TOVCO 22 TOTCXO 20 DTMF/ IC13 2 TONE CPU 2 VCO LPF X1 TCXO

LPF AF AMP IC15 (2/2)

High-speed data is output from pin 2 of the CPU. The signal passes through a low-pass CR filter, and provides a TX and SP out tone, and is then applied to the audio processor (IC14). The signal is mixed with the audio signal and goes to the VCO. TX deviation is adjusted by the CPU. (See fig.7)

(RX Audio)

Fig. 7 Microphone amplifier

2) Drive and Final amplifier
The signal from the T/R switch (D5 is on) is amplified by the pre-drive (Q5) and drive amplifier (Q6) to 50mW. The output of the drive amplifier is amplified by the RF power amplifier (IC1) to 4.0W (1W when the power is low). The RF power amplifier consists of two MOS FET stages. The output of the RF power amplifier is then passed through the harmonic filter (LPF) and antenna switch (D3 is on) and applied to the antenna terminal. 20

5. Power supply
There are five 5V power supplies for the microprocessor: 5V,5M,5C,5R, and 5T. 5V for microprocessor is always output while the power is on. 5M is always output, but turns off when the power is turned off to prevent malfunction of the microprocessor. 5C is a common 5V and is output when SAVE is not set to OFF. 5R is 5V for reception and output during reception. 5T is 5V for transmission and output during transmission.

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