Kenwood KCH-20R Manuel utilisateur

SERVICE MANUAL

2015/6

B5B-7206-00

REMOTE CONTROL HEAD

RA027<Rev.001>20156SERVICE MANUALB5B-7206-00

KCH-20R

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

This product complies with the RoHS directive for the European market. This product uses Lead Free solder.

1-2 (No.RA027<Rev.001>)

Document Copyrights

No part of this manual may be reproduced, translated, distributed, or transmitted in any form or by any means, electronic, mechan-

ical, photocopying, recording, or otherwise, for any purpose without the prior written permission of JVC KENWOOD Corporation.

Disclaimer

While every precaution has been taken in the preparation of this manual, JVC KENWOOD Corporation assumes no responsibility

for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein.

JVC KENWOOD Corporation reserves the right to make changes to any products herein at any time for improvement purposes.

Bluetooth Copyrights

The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by

JVC KENWOOD Corporation is under licence. Other trademarks and trade names are those of their respective owners.

SECTION 1

PRECAUTION

This service manual does not describe PRECAUTION.

(No.RA027<Rev.001>)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 INSTALLATION

2.1.1 Installing the Remote control head (KCH-20R)

The KCH-20R control head is used to remotely operate the

NX-5700/5800 series transceiver.

The KCH-20R is connected to the KCT-71 remote control cable.

The KRK-15B is connected to the NX-5700/5800 RF Deck with

the KCT-71.

2.1.2 Connection image

2.1.3 DIP Switch setting

All DIP switches for single remote (KCH-20R and KRK-15B)

must be set as "ON".

2.1.4 Remove the Operation panel from the transceiver

(NX-5700, NX-5800 only)

(1) Lift the two tabs of the panel on the bottom of the transceiv-

er with a flat-head screwdriver and remove the panel from

the chassis. (Fig. 1)

Fig.1

(2) Remove the flat cable from the display unit connector

(CN6) of the panel.

(3) Remove the cable from the display unit connector (CN2) of

the panel.

2.1.5 Install the KRK-15B onto the NX-5700, NX-5800 RF

Deck

(1) Insert the cable into the interface unit (XC3-0090-20) con-

nector (CN2) of the KRK-15B.

(2) Insert the flat cable into the interface unit connector (CN1)

of the KRK-15B. (Fig. 2)

Fig.2

Note:

The blue line of the flat cable and the flap of connector

are as same side.

After inserting, the flat cable should be locked with the

connector (flap) surely.

(3) Fit the KRK-15B with four tabs onto the front of the chassis.

(Fig. 3)

Fig.3

Note:

When installing the KRK-15B onto the front of the chas-

sis, hold down the flat cable with your fingers to prevent

it from being caught.

NX-5700/5800

RF Deck

KCT-71

Remote Control Cable

KRK-15B

Featured Panel

KCH-20R

KCT-72

Connection Cable

KCH-20R

1 2 3 4

KRK-15B

1 2 3 4

KRK-15BCN1

CN2

RF Deck

1-4 (No.RA027<Rev.001>)

2.1.6 Connect the KRK-15B and KCH-20R with the KCT-71

(1) Insert one lead wire with connector of the KCT-71 into the

connector (CN3) of the KRK-15B. (Fig. 4)

Fig.4

(2) Secure the cable bush as shown in the figure 5 and attach

the waterproof packing.

Note:

There is a direction to the installing of the cable bush.

Fig.5

(3) Slide the molding cover so as not to float the waterproof

packing and attach so that it is locked. (Fig. 6)

Fig.6

(4) Insert the other lead wire with connector of the KCT-71 into

the connector (CN5) of the KCH-20R.(Fig. 7)

Fig.7

(5) Attach the waterproof packing and molding cover in the

same way of step 2 and 3.(Fig. 8) (Fig. 9)

Fig.8

Fig.9

KCT-71 lead wire with connector

KRK-15B

CN3

Waterproof Packing

Cable Bush

Molding Cover

KCH-20R

KCT-71 lead wire with connector

CN5

(No.RA027<Rev.001>)1-5

2.1.7 Fixing method of KCH-20R microphone cord

This mounting hardware is intended to protect the modular

jack under use environment.

(Microphone can be used without this mounting hardware.)

Microphone cord should be fixed so that the curl portion is lower

side.

Refer to the following figs

Fig.10

Fig.11

Fig.12

PAN HEAD SEMS SCREW

(N67-3006-43)

MOUNTING HARDWARE

(J2B-0051-00)

Fixing the Microphone cord

NG: Curly cord upper side

OK: Curly cord lower side

1-6 (No.RA027<Rev.001>)

2.2 CIRCUIT DESCRIPTION (KCH-20R)

2.2.1 Overview

KCH-20R is a remote control panel with 2.75" LCD and extended keys. KCH-20R has built-in Bluetooth and micro SD card slot. The

Bluetooth supports HSP. KCH-20R has two circuit units. XC3-010 is Sub unit and XC3-011 is Interface unit. There consist of a power

supply circuit, audio circuit, control circuit and the Bluetooth circuit.

2.2.2 Power supply circuit

SB is provided from Mobile Deck (NX-5700 or NX-5800) when Mobile DECK turns on. SB is connected to modular jack , IC1 and IC2.

IC1 regulates SB voltage to 5.36V(53DC) and IC2 regulates SB voltage to 3.9V(39DC). Both ICs operate whenever SB is supplied.

53DC is the power supply for Class-D Audio Amplifier, CAN transceiver, IC8(50D) and each LED.

39DC is the power supply for all DC/DC and regulators except for IC1(53DC), IC2(39DC).

A1 regulates 39DC to 1.2V(12D) and 12D provides the power to MPU core.

IC5 outputs 1.8V(18D) while 12D is operating. 18D provides the power to MPU I/O, DDR, Codec DSP and enables each regula-

tor(IC3, IC4, IC6). 18D_Flash is the power supply for Flash memory. After 33D turns on, IC10(switch IC) operates and 18D_Flash

starts working.

IC8 regulates 5.36V(53DC) to 5.0V(50D) and provides the power to Level shift circuit and Audio circuit. 50D is enabled while 18D is

operating.

IC3, IC4 and IC6 is provided 3.9V(39DC) and while 18D is operating, each IC outputs 3.0V(30LCD), 3.3V(33A) and 3.3V(33D).

30LCD is the power for LCD module. 33A is the power for Audio circuit and Codec analog section. 33D is the power for MPU I/O,

Codec I/O, CAN transceiver and Flash memory.

IC9 regulates 3.9V(39DC) to 3.3V(33SD). 33SD is the power for SD Circuit. When SD Card is used, MPU outputs 33SDC High signal

and IC9 starts working.

Power supply diagram is described Fig. 1.

(No.RA027<Rev.001>)1-7

Fig.1 Power supply diagram

External Interface

XC3-011

Level shift circuits,

Audio circuits

MPU core

Flash memory

CAN transceiver,

Flash memory,

Bluetooth circuits

CAN transceiver

Modular Interface

XC3-010

CN5 SB

IC1

5.4V DC/DC

53DC

CN13

CN1

Class-D Audio Amplifier

18D

IC8

5V AVR

53DC

50D

12D

39DC

IC2

3.9V DC/DC

12D Q1

Level shift

1.2V DC/DC

IC5

1.8V DC/DC

18D

IC10

Switch

18D_Flash

33D

IC6

3.3V AVR

33D

18D

“33SDC”

3.3V AVR

IC9 33SD SD Circuit

LCD module

30LCD

IC3

3.0V AVR

3.3V AVR

IC4 33A Audio circuits,

Codec Analog section

MPU I/O,CodecI/O,

MPU,Mobile DDR,

Codec DSP,

Bluetooth circuits

Key backlight/LED indicator

1-8 (No.RA027<Rev.001>)

2.2.3 Audio circuit

2.2.3.1 RX Audio

KCH-20R has two RX Audio input channels, AFIA+/- and AFIB+/-. And the MPU selects the one of the two channels, and then applied

to digital potentiometer IC (IC22/XC3-010). (The channel to use is notified by serial communication from RF Deck.)

The digital potentiometer IC adjusts RX Audio signal amplitude equal to the value of selected volume step, and output it.

RX signal through digital potentiometer IC is put into codec IC (IC17/XC3-010). KCH-20R has several output method of RX audio

signal (Speaker port, Bluetooth headset, and micro SD card recording). When use speaker output path, this audio signals pass through

to output port of codec IC. When use other output method, codec IC convert this signal to digital data, and transmits to the MPU (IC14/

XC3-010).

That analog output signal from codec IC is converted to balanced signal by operational amplifier (IC18/XC3-010).

And converted signal goes to Class-D audio amplifier (IC2/XC3-011). The audio amplifier is controlled to shut-down or power-up, by

MPU.

2.2.3.2 TX Audio

KCH-20R has four microphone input channels. First one is connected to modular interface (J2/XC3-010), second is connected to

external interface connector (CN2/XC3-011). Third is Bluetooth headset. Fourth is micro SD recording playback. When use modular

interface or external interface, these two microphone signals are selected by analog multiplexer IC (IC29/XC3-010), and applied to

microphone amplifier. The microphone amplifier consists of operational amplifier and AGC. And its output is connected to Codec IC.

The total gain of amplifiers in Codec IC is set to 0dB. The output signal of codec IC is converted to balanced signal by operational

amplifier (IC28/XC3-010). The converted signals are switched by analog switch IC (IC35/XC3-010, IC36/XC3-010), and output to ei-

ther MICA+/- or MICB+/-. The output channel is notified from RF Deck by serial communication.

Fig.2 Audio Circuit

2.2.4 Control circuit

The control circuit consists of MPU (IC14/XC3-010) and its peripheral circuits. IC14(XC3-010) mainly performs the followings;

(1) Serial communication between RF deck and KCH-20R.

(2) Controlling the audio circuits including codec IC.

(3) Controlling the display, and micro SD card.

(4) Controlling the Bluetooth circuit.

2.2.4.1 MPU

The MPU is 32bit RISC processor, equipped with peripheral functions. The maximum operating clock of MPU is 288MHz, and power

source are 3.3V/1.8V/1.2V DC. The MPU controls the flash memory, Mobile DDR, the audio circuits, the key-matrix, external I/O cir-

cuit, the display (LCD), the Bluetooth, and the micro SD card.

Analog SW

Digital

Potentiometer

Codec

OP AMP

Analog SW

AGC

Multiplexer

XC3-010XC3-011

CN5 RX Audio CN13

IC2

Audio

Power AMP

TX Audio

CN2

CN1

AFiA+

AFiB+

AFiA-

AFiB-

AFO+

AFO-

MICA+

MICB+

MICA-

MICB-

ACC_MIC

MIC

IC29

IC36

IC35

IC15

IC16

IC19

IC22

IC18

IC28

OP AMP

D37,D38,Q17

IC23

IC17

(No.RA027<Rev.001>)1-9

2.2.4.2 Memory Circuit

Memory circuit consists of the MPU and the Mobile DDR (IC23/XC3-010), the flash memory (IC29/XC3-010). The flash memory has

capacity of 256Mbit that contains the program for the MPU and stores the data. That program can be easily updated from external

devices. The Mobile DDR has capacity of 512Mbit. The MPU copies the program from the flash memory to the Mobile DDR. The MPU

uses the Mobile DDR as a work area.

2.2.4.3 Serial interface between RF deck and KCH-20R

KCH-20R is controlled by serial interface from RF deck. That interface consists of CAN transceiver (IC1/XC3-010), but that does not

support CAN protocol. UART communication is used between CAN transceiver and MPU.

2.2.4.4 LCD control interface

The MPU controls LCD through the LCD interface connector (CN57/XC3-010). LCD is controlled by parallel bus with 16bit data width.

2.2.4.5 Key detection

KCH-20R has 19 keys. The keys except the AUX key and Power key is included in key-matrix circuit. Key-matrix consists of 4 input

ports and 5 output ports. When key is pressed, the MPU starts scanning the keys and detects which key was pressed.

AUX key is connected to MPU independently. The power key is connected to RF deck through the RF deck interface connector (CN5/

XC3-011).

2.2.4.6 External I/O

KCH-20R has external interface connector (CN2/XC3-011). That interface has two output and two input terminals.

The output terminal is open collector type. The input terminal has level shift circuit, it permits input the 5V signal.

2.2.4.7 micro SD circuit

The micro SD card interface consists of 4bit data bus and control signals. Maximum data transfer speed is 36MHz.

2.2.5 Bluetooth Circuit

The main component of the Bluetooth circuit is Bluetooth IC (IC12/XC3-010) and level converter circuit.

The clocks of Bluetooth IC requires 19.2MHz for core and 32.768kHz slow clock (X1/XC3-010 and X2/XC3-010) for UART.

Bluetooth IC communicates to the MPU (IC14/XC3-010) on the HCI UART. Interface of UART & Digital audio (I2S) between the MPU

and the Bluetooth IC, have level conversion at the level converter IC (IC13/XC3-010 and IC11/XC3-010).

The Bluetooth IC is powered by 1.8V and 3.3V which are supplied from 2 discrete external regulators (IC5/XC3-010 and IC6/XC3-

010).

TX/RX frequency is 2400-2483.5MHz (79ch Hopping, 2402-2480MHz, 1MHz step). Transmitting power is +2dBm at Bluetooth an-

tenna input.

Bluetooth antenna is surface mount chip antenna (ANT1/XC3-010), and that is connected to the Bluetooth IC through the LC filter

(L30/XC3-010).

Fig.3 Bluetooth Circuit

Frequency configuration for Bluetooth is following:

There are two LO modes: 2X and Offset LO (OSLO). 2X where LO is 2*RF_FREQ (e.g. when transmitting at 2441MHz it is at

4882MHz). OSLO where LO is at (2/3)*RF_FREQ (e.g. when transmitting at 2441MHz it is at 1627.333MHz).

In RX the 2X is always used.

In GFSK TX if power is 10dBm or more then OSLO is used.

In EDR2 TX if power is -12dBm or more then OSLO is used.

In EDR3 TX if power is -12dBm or more then OSLO is used.

Otherwise 2X is used for TX as well.

Converter

Level

Converter

UART

PCM

Antenna

IC14

MPU

19.2MHz

RF SW

D31/Q8

3.3V

IC13

Level

IC11

1.8V 1.8V

IC12

Bluetooth IC

L30

LC Filter

32.768kHz

ANT1

Bluetooth

1-10 (No.RA027<Rev.001>)

2.3 COMPONENTS DESCRIPTION

2.3.1 Sub unit (XC3-0100-20)

2.3.2 Interface unit (XC3-0110-20)

Ref. No. Part Name Description

A1 DC-DC

CONVERTER

DC-DC CONVERTER (12DC)

IC1 MOS IC CAN transceiver IC

IC2 MOS IC DC-DC Converter (39DC)

IC3 MOS IC Voltage regulator (30LCD)

IC4 MOS IC Voltage regulator (33A)

IC5 MOS IC Voltage regulator (18D)

IC6 MOS IC Voltage regulator (33D)

IC7 MOS IC Voltage detector IC

IC8 MOS IC Voltage regulator (50D)

IC9 ANALOG IC Voltage regulator (33SD)

IC10 MOS IC DC switch

IC11 MOS IC Level converter IC

IC12 MOS IC Bluetooth IC

IC13 MOS IC Level converter IC

IC14 MPU IC MPU

IC15,16 MOS IC Analog switch (AF)

IC17 MOS IC Codec IC

IC18,19 MOS IC AF amplifier

IC20 MOS IC Logic control

IC21 MOS IC Logic control

IC22 MOS IC D/A Converter IC

IC23 MOS IC DC/AF amplifier (Vref/AF)

IC24 SRAM IC SDRAM

IC25 MOS IC A/D Converter IC

IC26 MOS IC Analog switch

IC27,28 MOS IC AF amplifier

IC29 MOS IC Analog switch (AF)

IC30 ROM IC Flash memory

IC31 MOS IC Analog switch

IC32 MOS IC Logic control

IC34 MOS IC DC amplifier (Buffer/Vref)

IC35,36 MOS IC Analog switch (AF)

IC37 MOS IC Logic control

IC38 MOS IC LED Driver IC (LCD backlight)

PH1 PHOT

TRANSISTOR

Illuminance sensor

Q1 FET DC switch

Q2,Q3 FET DC switch (Open drain)

Q4 DIGI

TRANSISTOR

DC switch

Q5 TRANSISTOR Buffer amprifier (TCXO)

Q6 DIGI

TRANSISTOR

DC switch

Q7-Q14 FET DC switch

Q15,Q16 FET DC switch

Q17 TRANSISTOR Mic AGC

Q18 FET DC switch

D1, 2 VARISTOR ESD protection

D3 DIODE Reverse current prevention

D4-6 LED LED_Key Backlight

D7 DIODE Reverse current prevention

D8-10 LED LED_Key Backlight

D11 DIODE Reverse current prevention

D12-15 LED LED_Key Backlight

D16 DIODE DC-DC Converter (39DC)

D17 DIODE Reverse current prevention

D18-21 LED LED_Key Backlight

D22 DIODE Reverse current prevention

D23,24 ZENER DIODE Overvoltage protection

D25-28 LED LED_Key Backlight

D29,30 DIODE Reverse current prevention

D31 DIODE DC switch

D32 LED Green-LED_Indicator

D33 LED 3colors-LED_Indicator

D34 DIODE DC Level shifter

D36 DIODE DC Level shifter

D37,38 DIODE ARRAY Mic AGC Detection

D39 DIODE Overvoltage protection

D40 DIODE DC Level shifter

D41 ZENER DIODE Overvoltage protection

D42,43 VARISTOR ESD protection

D44 VARISTOR Current protection

D45,46 VARISTOR ESD protection

D47-51 ZENER DIODE ESD protection

D57 DIODE DC discharge

D58 LED Red-LED_Indicator

D59 DIODE DC smoothing

Ref. No. Part Name Description

IC1 MOS IC DC-DC CONVERTER (53DC)

IC2 ANALOG IC Audio power amplifier (class D)

D1 VARISTOR Current protection

D4 DIODE DC-DC CONVERTER (53DC)

D5 DIODE Reverse current prevention

D6 VARISTOR ESD protection

D7 VARISTOR ESD protection

D8 VARISTOR ESD protection

D9 VARISTOR ESD protection

Ref. No. Part Name Description

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