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Service

HTX-400

MINI HANDHELD 70cm FM

AMATEUR TRANSCEIVER

Catalog Number : 19-1104

CONTENTS
page

Specifications ----------------------------------------------------------------------------------------------- 1

Theory of Operation --------------------------------------------------------------------------------------- 2

Block Diagram ---------------------------------------------------------------------------------------------- 8

Alignment Instructions ------------------------------------------------------------------------------------ 9

Test Equipment Set-Up --------------------------------------------------------------------------------- 12

Semiconductor Lead Identification and IC Internal Diagram ---------------------------------- 15

PCB Views ------------------------------------------------------------------------------------------------- 25

Wiring Diagram ------------------------------------------------------------------------------------------- 29

Troubleshooting Chart ---------------------------------------------------------------------------------- 30

Exploded View of Unit ---------------------------------------------------------------------------------- 31

Whole Parts List ------------------------------------------------------------------------------------------ 32

Schematic Diagrams ------------------------------------------------------------------------------------ 40

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1999 Tandy Corporation

Содержание HTX-400

Страница 1: ...am 8 Alignment Instructions 9 Test Equipment Set Up 1 2 Semiconductor Lead Identification and IC Internal Diagram 15 PCB Views 25 Wiring Diagram 29 Troubleshooting Chart 30 Exploded View of Unit 31 Wh...

Страница 2: ...ches 85 58 26 5 mm WEIGHT without batteries 4 2 oz 120g 2 RECEIVER SECTION CIRCUIT TYPE DUAL CONVERSION SUPERHETERODYNE IF FREQUENCY 1st IF 30 85 MHz 2nd IF 450 KHz SENSITIVITY 0 22 V for 12dB SINAD S...

Страница 3: ...NCTION Q101 Q102 Q103 Q104 Q105 Q106 Q201 Q202 Q203 Q305 Q304 Q302 Q303 Q301 Q501 Q601 Q602 Q603 Q604 Q606 Q607 Q801 Q805 Q804 Q810 Q107 MRF9242T1 MMBR951LT1 MMBR951LT1 2SC3356 2SC3356 KTA1001S 2SC422...

Страница 4: ...ERSE PROTECT D D CON S W CTCSS COMPARATOR CLOCK SHIFT S W MODEL SELECTOR PTT S W BACKLIGHT LED RX LPF S W TX LPF S W R TX LOCAL S W R TX VCO S W VCO OSC RX B S W SQ DET DEV VARICAP REMARKS KEC KOREA E...

Страница 5: ...OF EACH BLOCK 1 INTRODUCTION THE SYNTHESIZER CONSISTS OF THE FOLLOWING COMPONENTS PLL IC IC501 VCTCXO MODULE1 VCO VARICAP DIODE D302 IC501 IS A CMOS LSI THAT INCLUDES PRESCALLER Q304 L303 L302 D302 D...

Страница 6: ...ITH PROGRAMMABLE DIVIDER OUTPUT SQUARE WAVES AND DEVELOPS A SERIES OF PULSES WHOSE DC LEVEL DEPENDS ON THE PHASE ERROR OF EACH SIGNAL THE PHASE DETECTOR PULSE OUTPUT IS FED TO AN ACTIVE LOW PASS FILTE...

Страница 7: ...RAMMABLE DIVIDER THEN Fvco N X Fr FROM WHICH IT CAN BE SEEN THE PERCENTAGE ERROR IN Ft IS THE SAME AS THE PERCENTAGE ERROR IN Fo THE STABILITY OF THE CRYSTAL OSCILLATOR IS DETERMINED PRIMARILY BY THE...

Страница 8: ...WITH RV802 ADJUSTING RV802 SHALL NOT EXCEED 5 0KHz DEVATION UNDER 1KHZ AF 20dB UP FROM 3KHZ DEVATION LEVEL INPUT RECEIVER 1 RF AMP Q201 AMPLIFY RF SIGNAL FROM ANTENNA THE AMPLIFIED RF SIGNAL IS FED T...

Страница 9: ...8 BLOCK DIAGRAM...

Страница 10: ...ED 1 CPU and Phase Locked Loop Section Frequency Counter DC Power Supply DC Volt Meter Oscilloscope 2 Transmitter Section RF Power Meter RF SSVM 50 Load non inductive RF Attenuator Oscilloscope Audio...

Страница 11: ...ING CONNECTION ADJUST ADJUST FOR 1 Frequency adjustment Mode Receive Volume Optional Squelch Optional Frequency 445 50MHz Frequency counter To output pin 4 of Module 1 Figure 1 MODULE1 15 20MHz 100Hz...

Страница 12: ...e set Figure 4 Make sure that the indication of the transmitter freq Is 146 50MHz 5PPM on the frequency counter 4 MAX deviation check Mode Transmit Volume Optional Squelch Optional Frequency 445 50MHz...

Страница 13: ...12 TEST EQUIPMENT SET UP FIGURE 1 FIGURE 2...

Страница 14: ...13 FIGURE 3 FIGURE 4 45dBc...

Страница 15: ...14 FIGURE 5 FIGURE 6...

Страница 16: ...15 SEMICONDUCTOR LEAD IDENTIFICATION AND IC INTERNAL DIAGRAM 1 INTERGRATED CIRCUITS A IC801 TMP87CH21DF...

Страница 17: ...TATE FX465 RX Tone Decode IN OK L 18 P11 INT1 TRI STATE TX Enable 1 OUT ENABLE L 19 P12 INT2 TC1 TRI STATE TX Enable 2 OUT ENABLE L 20 P13 DVO TRI STATE EEPROM SERIAL DATA IN OUT 21 P14 PPG TRI STATE...

Страница 18: ...OUTPUT 51 SEG21 P62 LCD SEGMENT OUTPUT 52 SEG20 P63 LCD SEGMENT OUTPUT 53 SEG19 P64 LCD SEGMENT OUTPUT 54 SEG18 P65 LCD SEGMENT OUTPUT 55 SEG17 P66 LCD SEGMENT OUTPUT 56 SEG16 P67 LCD SEGMENT OUTPUT...

Страница 19: ...18 No PIN NAME REMARKS DESCRIPTION ACTIVE 75 COM1 LCD COMMON OUTPUT 76 COM0 LCD COMMON OUTPUT 77 VLC LCD DRIVE VOLTAGE 78 N C 79 N C 80 N C...

Страница 20: ...19 B IC805 FX465 C IC601 IC803 TK11230 D IC3 NJM 2073 FX465...

Страница 21: ...20 E IC501 LV2105 F IC802 24LC16...

Страница 22: ...21 G IC806 NJM2902V H IC401 TA31136FN...

Страница 23: ...22 I IC804 XC6371 J IC807 NJM2904 K IC808 AS2810 ADJ GND VOUT VIN...

Страница 24: ...2 Q302 Q303 Q304 TR 2SC4226 R24 OR R25 C Q203 TR KTC4081 HH C Q301 Q606 TR KRC404 ND C Q501 TR KRC410 NK C Q601 Q602 Q603 Q604 TR KRA310 PK C Q607 TR KTA2015 ZO B Q801 TR KTC3875 ALY B Q805 TR KRC104...

Страница 25: ...MARKING TYPE D201 D202 D101 D301 D830 DIODE MA77 4B B D102 DIODE MA862 M11 C D804 D805 D807 DIODE 1N4001 M2 B D806 DIODE RB471E D3G E D804A D802 DIODE KDS187 D3 D ZD803 ZENER DIODE ZD7 5Y 7 5Y A LED80...

Страница 26: ...25 PCB VIEWS 1 CPU RF VCO BOARD LOCATION CPU TOP LOCATION CPU BOTTOM LOCATION RF TOP LOCATION RF BOTTOM LOCATION VCO TOP LOCATION VCO BOTTOM LOCATION...

Страница 27: ...26 2 CPU RF VCO BOARD PATTERN CPU TOP PATTERN CPU 2LAYER PATTERN RF TOP PATTERN RF 2LAYER PATTERN VCO TOP PATTERN VCO 2LAYER PATTERN...

Страница 28: ...27 3 CPU RF VCO BOARD PATTERN CPU 3LAYER PATTERN CPU BOTTOM PATTERN RF 3LAYER PATTERN RF BOTTOM PATTERN VCO 3LAYER PATTERN VCO BOTTOM PATTERN...

Страница 29: ...28 4 AUDIO PTT BOARD LOCATION AUDIO TOP LOCATION PTT TOP LOCATION 5 AUDIO PTT BOARD PATTERN AUDIO TOP PATTERN AUDIO BOTTOM PATTERN PTT TOP PATTERN PTT BOTTOM PATTERN...

Страница 30: ...29 WIRING DIAGRAM _ _ YELLOW GREEN BLACK RED MIC SPEAKER...

Страница 31: ...not work 1 Defective X801 IC801 1 Replace No TX output power 1 Defective Q101 Q102 Q103 D101 RV101 L108 L105 1 Replace ERROR MESSAGES PROBLEM REASON CHECK POINT COUNTER MEASURE EEP ROM Error No 3V in...

Страница 32: ...31 EXPLODED VIEW OF UNIT...

Страница 33: ...Y CPU INSERT 1 28020015 LCD KXN29740 AAP 1 11 LCD801 32020007 CONNECTOR GDH7 24DBCW 1 CON401 33020003 POWER JACK 1 PIE HEC1737 01 510 1 J801 37420003 ZEBRA CONNECTOR 29 L 1 5 W 3 5 H 1 12 61000152 REF...

Страница 34: ...R809 15210564 THICK FILM CHIP R 560K J 1 16W 0603 1 R841 15210682 THICK FILM CHIP R 6 8K J 1 16W 0603 1 R820 15210822 THICK FILM CHIP R 8 2K J 1 16W 0603 4 R829 R830 R833 R834 15210823 THICK FILM CHIP...

Страница 35: ...WIRE GR AWG28 1 7 1 22 3 1 37020028 WIRE YE AWG28 1 7 1 22 3 1 61000420 COVER FRONT BLK FULL AL 1 01 67000009 NUT 5 INSERTING MBSBD1 M1 7 L4 2 67000010 NUT 3 INSERTING MBSBD1 M2 L14 8 3 67000011 NUT 4...

Страница 36: ...R115 R509 R502 15210104 THICK FILM CHIP R 100K J 1 16W 0603 2 R212A R403 15210121 THICK FILM CHIP R 120 J 1 16W 0603 1 R207 15210122 THICK FILM CHIP R 1 2K J 1 16W 0603 2 R201 R212 15210181 THICK FILM...

Страница 37: ...15 C216 C218 C221 C222 C502 17010103 C CERAMIC GRM39 X7R 103K 50 7 C132 C133 C134 C511 C601 C603 C605 17010104 C CERAMIC GRM39 Y5V 104Z 25 5 C402 C403 C405 C407 C412 17010120 C CERAMIC GRM39 COG 120J...

Страница 38: ...001 LC FILTER LFB30N12B0445B010 2 SAW1 SAW2 M40E119A PCB MA 440 RF 52 44 0 8T MLB 1 80169014 ASS Y RF INSERT 1 16620203 RESISTOR VARIABLE V 9M COS2009 B20K 1 VR101 21420040 COIL QUAD 455K QUAD COIL 1...

Страница 39: ...1820044 COIL SPRING 0 4 1 3 2T 1 L302 22010100 COIL CHIP FSLU2520 R22K P2 2 L303 L305 22010105 COIL CHIP FSLU2520 27NK P2 2 L301 L302 M40E120A PCB MA 440 VCO 11 0 18 0 0 8T MLB 1 80169016 ASS Y VCO IN...

Страница 40: ...17 ASS Y BATT CASE 1 61000242 BUTTON LOCK ACETAL BLK 1 43 61000256 CASE 1 BATTERY PC ABS BLK 1 41 62000033 TERMINAL A SUS 0 2T NI PL 1 37 62000034 TERMINAL B SUS 0 2T NI PL 1 47 62000035 TERMINAL C SU...

Страница 41: ...40 SCHEMATIC DIAGRAM...

Страница 42: ...41...

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