Kenwood TK-7102H CIRCUIT DESCRIPTION / SEMICONDUCTOR DATA

TK-7102H

18

■ Decode

• QT/DQT/DTMF

The signal (W/NO (EVOL2)) goes to SIGNAL (pin 88) of

CPU (IC101). The QT/DQT signal will pass through the low-

pass filters in the CPU (IC101) and be decoded within the

CPU (IC101). The DTMF signal will be decoded within the

CPU (IC101).

■ D/A Converter

The D/A converter (IC161) is used to adjust MO modula-

tion, AF volume, TV voltage, FC reference voltage, and PC

POWER CONTROL voltage level.

Adjustment values are sent from the CPU as serial data.

The D/A converter has a resolution of 256 and the following

relationship is valid:

D/A output = (Vin – VDAref) / 256 x n + VDAref

Vin: Analog input

VDAref: D/A reference voltage

n: Serial data value from the microprocessor (CPU)

Power Supply Circuit

When the power switch on the display unit is pressed, the

power port on the display unit which is connected port 17

(POWER), goes low, then port 82 (SBC) goes high, Q32 turns

on, SB SW (Q31) turns on and power (SB) is supplied to the

radio.

When the DC power supplied to the radio, the voltage

regulator IC (IC33) supply into the CPU VDD and reset voltage

detect IC (IC34). IC34 will generate signal (RESET) in to the

reset terminal on the CPU (IC101) to carry out a power ON

reset. Also, CPU (IC101) is checking on port 91 (Battery Volt-

age). If DC power is less than about 9.5V, the radio is unable

to power on.

When the DC power voltage deceases from normal volt-

age, the INT voltage detector IC (IC35) will set to high on CPU

port 18 (INT) if B line will became less than about 9.5V. Then

CPU send to EEPROM (IC66) the backup data and go into

STOP mode.

This circuit has an overvoltage protection circuit. If a DC

voltage of 18V or higher is applied to the base of Q61, this

voltage turns Q61 on and turns Q32 and SB off.

IC101

CPU

SIGNAL W/NO (EVOL2)

88

Q71

SW

Q31

SW

Q32

SW

Q61

SW

IC33

AVR

D61

B

IC34

RST

SBC

IGN

R77R76

R39R40

INT

5M

BATT

IC101

CPU

POWER

SW

POWER

RESET

5M

IC35

AVR

SB

IGN

Fig. 15 Decode

Fig. 16 Power supply circuit

CIRCUIT DESCRIPTION / SEMICONDUCTOR DATA

SEMICONDUCTOR DATA

Drive Amplifier : PD55003TR

(TX-RX Unit Q503)

■ Absolute Maximum Ratings (TCASE = 25°C)

Symbol Parameter Value Unit

V(BR)DSS Drain-Source voltage 40 V

VGS Gate-Source voltage ±20 V

IDDrain current 2.5 A

PDISS Power dissipation (@ Tc=70°C) 31.7 W

Tj

Max. operating junction temperature

165 °C

TSTG Storage temperature –65 to +150 °C

Contents

Main TK-7102H SERVICE MANUAL CONTENTS REVISED TK-7102H GENERAL INTRODUCTION SCOPE OF THIS MANUAL ORDERING REPLACEMENT PARTS GENERAL / SYSTEM SET-UP SYSTEM SET-UP 1-5. Rear panel 1. Controls and Functions 1-4. Display o 1-2. Microphone 1-1. Front Panel 2. Operation Features 3. Transceiver Controls and Indicators 4. Scan Operating SCAN start condition Scan stop condition Revert channel Scan end TK-7102H SP Unmute Auto Reset Stun 7. Audible User Feedback Tones REALIGNMENT 1. Modes 2. How to Enter Each Mode 3. PC Mode 3-1. Preface REALIGNMENT 5. Accessory Connection Cable (KCT-39) 5-1. Installing the KCT-39 in the Transceiver Fig. 3 TK-7102H ) into the chassis ( Fig. 7 Accessory Port Function Fig. 6 REALIGNMENT / INSTALLATION 6-3. Modifying the Transceiver Fig. 2 R267 Fig. 8 INSTALLATION Fig. 4 Fig. 3 Setting With the KPG-70D Select External Devices from the Edit menu and set the Scrambler. DISASSEMBLY FOR REPAIR Frequency Configuration Fig. 1 Frequency configuration Fig. 2 Receiver system Receiver System Front-end RF Amplifier CIRCUIT DESCRIPTION Wide/Narrow Changeover Circuit Fig. 6 PLL circuit Fig. 4 AF signal system AF Signal System Transmitter System Outline Power Amplifier Circuit APC Circuit Control Circuit Memory Circuit Fig. 14 Encodet Fig. 13 Key matrix circuit Fig. 12 Display circuit CIRCUIT DESCRIPTION / SEMICONDUCTOR DATA SEMICONDUCTOR DATA Drive Amplifier : PD55003TR (TX-RX Unit Q503) Absolute Maximum Ratings (TCASE = 25C) SEMICONDUCTOR DATA Microprocessor : 30622MAA-B83GP (TX-RX Unit IC101) Terminal Function COMPONENTS DESCRIPTION Display Unit (X54-3460-20) TX-RX Unit (X57-6700-XX) TK-7102H TX-RX UNIT (X57-6700-XX) -22 : M -23 : M2 -24 : K -25 : K2 DISPLAY UNIT (X54-3460-20) Page Page Page Page Page EXPLODED VIEW PACKING Parts with the exploded numbers larger than 700 are not supplied. Test Equipment Required for Alignment Tuning cable (E30-3383-05) MIC connector (Front view) Test cable for microphone input (E30-3360-08) Adjustment Location Switch Part name label face down Fuse Locator PCB Section * Adjustment of TX VCO lock voltage K,M K2,M2 Test Frequency (MHz) Receiver Section Transmitter Section If normal power is not obtained, please follow the step below TERMINAL FUNCTION CN2 Function Port Assignment CN3 CN4 PC BOARD TK-7102H DISPLAY UNIT (X54-3460-20) Component side view (J72-0916-09) DISPLAY UNIT (X54-3460-20) Foil side view (J72-0916-09) ABCDEFGHIJ KLM NOPQRS TK-7102H 37 38 S RQP O NMLK J IHGF PC BOARD TK-7102H 39 40 ABCDEFGHIJ KLM NOPQRS Ref. No. TK-7102H 41 42 46 1 * SCHEMATIC DIAGRAM TK-7102H Note : The components marked with a dot () are parts of layer 1. X57-6700-XX TX-RX UNIT X54-3460-20 DISPLAY UNIT M P TK-7102H TK-7102 H 47 48 BLOCK DIAGRAM TX-RX UNIT (X57-670x-xx) DISPLAY UNIT (X54-3460-20) TK-7102H TK-7102H 49 50 LEVEL DIAGRAM Transmitter Section 4 SPECIFICATIONS 51 GENERAL RECEIVER TRANSMITTER KENWOOD CORPORATION