PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-68

This product complies with the RoHS directive for the European market.

B5B-7364-00

SERVICE MANUAL

TH-D75A, TH-D75E

This product uses Lead Free solder.

No.RA096<Rev.001>

2024/1

Table of Contents

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Summary of Contents for Kenwood TH-D75A

Page 1: Table Of Contents
2024 1 S ERVICE MANUAL B5B-7364-00 TH-D75A, TH-D75E COPYRIGHT © 2024 JVCKENWOOD Corporation TABLE OF CONTENTS PRECAUTION............... . . 1-7 SPECIFIC SERVICE INSTRUCTIONS .
Page 2: Document Copyrights
Document Copyrights Copyright 2024 by JVCKENWOOD Corporation. All rights reserved. No part of this manual may be reproduced, translated, distributed, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, for any purpose without the prior written permission of JVCKENWOOD Corporation.
Page 3: Specification
SPECIFICATION TH-D75A (K type) GENERAL Frequency Range Band A / Band B 144 - 148, 222 - 225, 430 - 450 MHz 136 - 174, 216 - 260, 410 - 470 MHz Band B Band B 0.1 - 76, 76 - 108 MHz (WFM)
Page 4 Sensitivity (TYP.) Except above 10 dB S/N 0.3 - 0.52 MHz - 4 uV Amateur Band 0.52 - 1.8 MHz - 1.59 uV 1.8 - 54 MHz 0.63 uV 54 - 76 MHz 1.12 uV 118 - 174 MHz - 0.50 uV 200 - 250 MHz - 0.63 uV...
Page 5 TH-D75E (E, T types) GENERAL Frequency Range Band A / Band B 144 - 146, 430 - 440 MHz 136 - 174, 410 - 470 MHz Band B Band B 0.1 - 76, 76 - 108 MHz (WFM) 108 - 524 MHz Mode F3E, F1D, F2D, F7W F3E, F1D, F2D, F7W, A1A, A3E, J3E...
Page 6 Sensitivity (TYP.) Except above 10 dB S/N 0.3 - 0.52 MHz - 4 uV Amateur Band 0.52 - 1.8 MHz - 1.59 uV 1.8 - 54 MHz 0.63 uV 54 - 76 MHz 1.12 uV 118 - 174 MHz - 0.50 uV 200 - 250 MHz - 0.63 uV...
Page 7: Section 1 Precaution
Circuit Description 2.1.1 Outline The TH-D75A is an FM triple-band handheld transceiver designed for amateur radio applications in the 144/220/430MHz bands. The TH-D75E is an FM dual-band handheld transceiver designed for amateur radio applications in the 144/430MHz bands. 2.1.2 Frequency Configuration This transceiver has two discrete VCO/PLL and IF circuit configurations for the Band A and Band B to achieve simultaneous dual- band signal reception.
Page 8 RF AMP enters the distribution circuit for signal distribution with the Band B. The distributed signal passes through RF ATT (D411) and notch filter (NOTCH: C438, TH-D75A only), and is amplified by the second RF AMP (Q402). The signal is amplified by the RF AMP, passes through the band-pass filter, and enters the first mixer (1st MIX: Q400).
Page 9 Band B UHF receiver circuit The reception signal from the antenna passes through the filter circuit and enters the RF AMP (LNA: Q406). The signal amplified by the RF AMP enters the distribution circuit for signal distribution with the Band A. The distributed signal passes through RF ATT (D511) and is amplified by the second RF AMP (Q503).
Page 10 The automatic power control (APC) circuit ensures stable TX power and is in control of TX power by detecting voltage generation from the drain current of the final amplifier (FINAL AMP: Q217 or Q218 [TH-D75A only]) in use. The voltage generated in the resistors (R226 and R227) by the drain current of the final amplifier (Q217) is amplified by the operational amplifiers (APC: IC200 and Q207).
Page 11 The MAIN MPU (IC2005) monitors the detected voltage (FTH) of the thermistor (TH200) arranged for the prevention of the thermal breakdown of the final amplifier (FINAL AMP: Q217 or Q218 [TH-D75A only]) in use. An APC voltage (OAGCA/APC) change will occur when the temperature exceeds the preset temperature, at which time the TX power will be controlled to prevent excessive heat generation.
Page 12 The MAIN MPU (IC2005) is in control of the switching timing of transmission and reception by monitoring these voltages. I2C_CK, I2S_SD, I2S_FS CODEC Band B To PRE DRV VCO/PLL IC2011 IC2027 IC1103 IC700 TH-D75A only Q201 FREQ1 IC604 RF SW RF SW PHASE R DIVIDER DETECTOR TCXO1...
Page 13: Protection Circuit
Reception AF signals for the Band A and Band B will be independently applied to the MAIN MPU (IC2005) if the CTCSS, DCS, and Weather Alert (TH-D75A only) function are ON. The selected signal components will be amplified to a necessary level for decoding processing.
Page 14: Control System
FM TUNER circuit The FM broadcasting band (76 to 108MHz, WFM band) can be received from the SMA connector. The received signal passes through a band-pass filter, is amplified by the RF AMP (Q2016), and then enters the FM TUNER (IC2047). The signal is demodulated and detected in the FM TUNER to become an audio signal and de-emphasized.
Page 15: Memory Circuit
2.1.8.1 MAIN MPU The MAIN MPU (IC2005) incorporates a 32-bit RISC processor, fixed/floating point VLIW digital signal processors, and peripheral functions. This MAIN MPU operates at 278.4MHz (MAX) clock and 3.3V/1.8V/1.2V DC. The MAIN MPU controls the transmission and reception of data to and from the flash memory (FLASH: IC2008), DDR (IC2002), control circuit, display circuit, SUB MPU (IC1103), and external devices.
Page 16 MAIN UNIT(1/5) CONTROL TCXO 19.2M MAIN MPU X2000 X2001 IC2005 FM TUNER SUB MPU VCO/PLL IC800 IC2047 IC1103 TU_AUD_DI /PLL_CS_A McASP UART0 VCO/PLL IC700 /PLL_CS_B IC2006 BT/GPS IC2044 /RST McASP IF IC UART1 IC900 /IF_CS_A UART2 FLASH(256MB) 240×180 IF IC IC2008 IC1002 /CS4...
Page 17 2.1.8.9 Bluetooth/GPS Circuit The Bluetooth/GPS circuit mainly consists of the Bluetooth/GPS IC (BT/GPS: IC2044). The Bluetooth/GPS requires two clocks, one of which is the 19.2MHz (X2003) clock and the other is the clock at 32.768kHz (X2004) for the UART. The Bluetooth/GPS IC uses the HCI UART and AI2 UART to communicate with the MAIN MPU (IC2005). The UART and digital audio (PCM), which is the interface between the MAIN MPU and the Bluetooth/GPS IC, are level-converted using a level shift ICs (LV SFT: IC2036, IC2046 and IC2048).
Page 18: Components Description
COMPONENTS DESCRIPTION Ref. Use / Function Operation/Condition/Compatibility 2.2.1 MAIN UNIT (XC1-388K-01 , XC1-388E-01) IC2004 MIC AMP OP AMP [MIC AMP] Ref. Use / Function Operation/Condition/Compatibility IC2005 Main MPU MPU with DSP [MAIN MPU] IC102 40C DC/DC 4.0V DC/DC IC2006 Reset 3.5V Detect [RST] IC103 Pulse Genera-...
Page 19 Ref. Ref. Use / Function Operation/Condition/Compatibility Use / Function Operation/Condition/Compatibility IC2048 Level Shift Level Shift 1.8V <=> 3.3V [LV SFT] Q409 VHF RX [SW] IC2049 Inverter Oscillation Circuit for FM TUNER IC Q411 220M RX Notch Band A [SW] [INV] * Q411 is only used in XC1-388K-01.
Page 20 Ref. Ref. Use / Function Operation/Condition/Compatibility Use / Function Operation/Condition/Compatibility Q2009 SW MOD AMP ON / OFF [SW] D221- RF SW VHF TX [RF SW] Q2010 SW 18M DC/DC ON / OFF [SW] D224, RF SW 220M TX [RF SW] Q2011 SW Bus Switch ON / OFF [SW] * D224 and D225 are only used in...
Page 21: Terminal Function
TERMINAL FUNCTION Ref. Use / Function Operation/Condition/Compatibility 2.3.1 MAIN UNIT (XC1-388K-01 , XC1-388E-01) (1/5) CONTROL D700- RF SW Band B 1st Local [RF SW] Name Function D800- RF SW Band A 1st Local [RF SW] CN1 ( to LCD ) D1000 Over Voltage MOD Signal Input [OVR V PRTCT] LEDK3...
Page 22 Name Function Name Function LAMP GND LAMP GND BATOFF Battery line connection switch KEY_I0 Key matrix I2CDTR I/O I2C DATA signal for FM TUNER (IC2047) KEY_I1 Key matrix KEY_I2 Key matrix SCPU_TXD SUB MPU TXD signal KEY_I3 Key matrix KEY_I4 Key matrix SCPU_RXD SUB MPU RXD signal...
Page 23 Name Function Name Function I2CDTR I/O I2C DATA signal for FM TUNER (IC2047) HFOUT Band B HF RF signal SCPU_TXD SUB MPU TXD signal OAGCB Band B AGC signal ATT_B Band B ATT ON/OFF switch signal SCPU_RXD SUB MPU RXD signal POSWO Power switch output signal /S_RST...
Page 24 Name Function Name Function BFMS Band B switch signal for power sup- KEY_I2 Key matrix ply (76-108MHz) KEY_I1 Key matrix CN13 (to BARANT) KEY_I0 Key matrix SW RF signal LAMP GND LAMP GND SW RF signal SP AF output SP GND LAMP GND LAMP GND MW RF signal...
Page 25 Pin No. Name Function Rating and Condition Communication channel 2 Pull-down resistor 5.1kΩ±10% When CC1 and CC2 0.61V, Type-C current USB default mode (500mA) When CC1 0.70V, or CC2 0.70V Type-C current 1.5A mode I/O USB D+ VIH>2.0V, VIL<0.8V VOH>2.4V,VOL<0.4V Full speed (12Mbps) I/O USB D- VIH>2.0V, VIL<0.8V...
Page 26 Pin No. Name Function Rating and Condition DSW2 Usually shorted to GND. VIH:2.0~3.6V Open when microSD is inserted. VIL:-0.3~0.8V Short to GND when microSD is not inserted. DSW1 Connect to GND 2.3.8 External microphone jack (2-pin jack) J2 Pin No. Name Function Rating and Condition...
Page 27: Section 3 Disassembly
SECTION 3 DISASSEMBLY How to Remove the Front Panel ASSY Front Panel ASSY (1) Remove the cap <1>. (2) Pull out the two knobs <2>. <2> (3) Remove the two screws <3> on the Front Panel ASSY. <2> (4) Remove the nut <4> of the antenna receptacle. (5) Remove the nut <5>...
Page 28: Precautions For Disassembly
Precautions for Disassembly Note: When attaching a new shielding cover to the PCB, be 3.3.1 How to Remove Key Tops careful not to deform it. After attaching, push the shield- (1) The key top is pasted to the surface of the Front Panel ing cover top surface (other than the center) evenly.
Page 29: Control Pcb
3.4.2 Confirmation of speaker cord soldering and forming 3.4.3 Sticking position of the Sheet (When assembling the Front Panel ASSY) Fold the FPC connecting the CONTROL PCB and TX-RX PCB, (1) Confirm the speaker cord part (a) is attached from bottom then stick the sheet on the FPC as shown.
Page 30: Panel Assy
3.4.5 Forming of GPS Coaxial Cable (2) After assembling the Front Panel ASSY into the chassis, (1) Stick the cushion <1> to cover the soldering land and line check that the rubber seal of the microSD slot section is of PCB fully as shown. firmly inserted.
Page 31 3.4.8 Assembly Information (Non-reusable parts) When "Main Parts" is changed (ordered), "Non-reusable parts" should also be changed (ordered) together. Especially the parts with adhesive such as Cushion and Sheet etc. cannot be reused. Use new ones regardless of whether they have been used in locations that affect performance of the products. Main Parts Non-reusable parts Part Name...
Page 32: Section 4 Adjustment
SECTION 4 ADJUSTMENT TH-D75A (K) type 4.1.3 Service Jig 4.1.1 Updating the Firmware Battery Jig (W3F-0208-00) The firmware can be updated using Firmware Updating Program (s). Update the firmware according to the procedure displayed in updating program. Download the latest updating program from the following URL: https://www.kenwood.com/i/products/info/amateur/...
Page 33 Connection cable How to enter adjustment mode using 3-pin plug ( 2.5) Connection cable consists of two pieces of CORD ASSY (X42- Description 3510-10), to extend its cable length double for connection It is possible to enter the adjustment mode by installing a re- between two PCBs.
Page 34 4.1.4 Adjustment Mode Outline (1) Set the transceiver to adjustment mode and change each setting data item. (2) This mode is used when the CONTROL PCB (MAIN UNIT 1/5) or TX-RX PCB (MAIN UNIT 2/5) is replaced at a service center or at the time of making transceiver re- adjustments.
Page 35 LCD display in the adjustment mode Major items and service setup Minor items (">" will appear when selected) Adjustment frequency Value stored in the transceiver Present value RSSI value (displayed only during BPF adjustment) * "TX Current" will appear during transmission power adjustment.
Page 36: Adjustment Items
Adjustment items and Display TH-D75A (K) type Display Adjustment items Adjustment Frequency 6th line Major item Minor item item number adjustment (MHz) displayed A. Battery Voltage (7.4 V) 0 COMMON Battery 439.900 B. TX Frequency Frequency1 B/S Off 439.900 B/S On-...
Page 37 TH-D75A (K) type Display Adjustment items Adjustment Frequency 6th line Major item Minor item item number adjustment (MHz) displayed C. TX Power TX Low Power UHF Frequency Center 440.100 TX Current Frequency Low 430.100 TX Current Frequency High 449.900 TX Current...
Page 38 TH-D75A (K) type Display Adjustment items Adjustment Frequency 6th line Major item Minor item item number adjustment (MHz) displayed H. SQL/S-meter SM B-Band 220 224.050 S-FULL SQL B-Band UHF Level1 439.950 SM B-Band UHF 439.950 S-FULL SQL B-Band 50 Level1 51.100...
Page 39 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 1. Frequency 6) Frequency2 COARSE B/S f. counter Encoder [] or 439.900MHz []/[] [Write] ±150Hz Frequency:439.900MHz Note: Before ad- Transmission justing this item, write 128 to "Frequency2 FINE...
Page 40 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 2. Power 8) Power:Low Power meter Encoder [] or 0.5W ±0.05W Frequency:144.100MHz Ammeter []/[] [Write] 1.00A or less Transmission 9) Power:Low Power meter Encoder [] or...
Page 41 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 2. Power 25) Power:Hi Power meter Encoder [] or 4.85W ±0.1W Frequency:440.100MHz Ammeter []/[] [Write] 2.2A or less Transmission 26) Power:Hi Power meter Encoder [] or...
Page 42 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 3. MOD Gain 3) MOD Gain UHF Linear detector Encoder [] or Transmit after Frequency: 430.100MHz []/[] [Write] writing 232. Then Linear detector check that the de-...
Page 43 4.1.7 Transmitter Section: User Mode Confirmation Items TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 1. TX Frequency Battery terminal:7.4V/3.0A f. counter Check 439.900MH ±400Hz 1) Frequency: 439.900MHz Transmission 2. TX Power Battery terminal:7.4V/3.0A...
Page 44 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 2. TX Power 17) Power: Hi Power meter Check 4.8W ±0.3W Frequency: 430.100MHz Ammeter 2.2A or less Transmission 18) Power: Hi Power meter Check 4.8W ±0.3W...
Page 45 4.1.8 Receiver Section: Adjustment Mode Setting Items TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 1.RX BPF 1) Frequency: 136.050MHz [Auto] Automatic Max RSSI value A-Band SSG: -110dBm (0.707μV) Oscilloscope adjustment Mode:FM (3kHz) Audio analyzer AF output:0.63V/8Ω...
Page 46 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment B-Band 14) Frequency: 379.950MHz [Auto] Automatic Max RSSI value SSG:-100dBm (2.24μV) Oscilloscope adjustment Mode:FM (3kHz) Audio analyzer AF output:0.63V/8Ω 15) Frequency: 439.950MHz [Auto] Automatic Max RSSI value SSG:-110dBm (0.707μV)
Page 47 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment B-Band 4) Frequency: 145.950MHz [] or Write SQL Level1 [Write] SSG:-122.5dBm (0.168μV) SSG:-117dBm (0.32μV) S-FULL SSG: -102dBm (1.77μV) 5) Frequency: 224.050MHz [] or Write...
Page 48 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment A-Band 5) Frequency: 438.050MHz Check 12dB SINAD or more Mode: FM (3kHz) Audio analyzer SSG: -120.5dBm (0.211μV) Oscilloscope AF output: 0.63V/8Ω ATT:ON 6) Frequency: 438.050MHz...
Page 49 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 2.Squelch 1) Frequency: 145.950MHz Check Open Squelch A-Band SQL :Level1 Oscilloscope Mode: FM (3kHz) SSG: -117dBm (0.32μV) 2) SSG: OFF Check Close Squelch Oscilloscope 3) Frequency: 223.550MHz...
Page 50 TH-D75A (K) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 3.S-meter 1) Frequency: 145.950MHz Check One or more seg- A-Band Mode:FM (3kHz) ments in S-meter SSG: -115dBm (0.4μV) light. 2) SSG: -100dBm (2.24μV) Check All segments in S-meter light.
Page 51 The firmware can be updated using Firmware Updating Program (s). Update the firmware according to the procedure displayed in updating program. Download the latest updating program from the following URL: https://www.kenwood.com/i/products/info/amateur/ software_download.html * The URL may change without notice. 4.2.2 Required Test Equipment (1) Stabilized Power Supply...
Page 52 Connection cable How to enter adjustment mode using 3-pin plug ( 2.5) Connection cable consists of two pieces of CORD ASSY (X42- Description 3510-10), to extend its cable length double for connection It is possible to enter the adjustment mode by installing a re- between two PCBs.
Page 53 4.2.4 Adjustment Mode Outline (1) Set the transceiver to adjustment mode and change each setting data item. (2) This mode is used when the CONTROL PCB (MAIN UNIT 1/5) or TX-RX PCB (MAIN UNIT 2/5) is replaced at a service center or at the time of making transceiver re- adjustments.
Page 54 LCD display in the adjustment mode Major items and service setup Minor items (">" will appear when selected) Adjustment frequency Value stored in the transceiver Present value RSSI value (displayed only during BPF adjustment) * "TX Current" will appear during transmission power adjustment.
Page 55 Adjustment items and Display TH-D75E (E, T) type Display Adjustment items Adjustment Frequency 6th line Major item Minor item item number adjustment (MHz) displayed A. Battery Voltage (7.4 V) 0 COMMON Battery 439.900 B. TX Frequency Frequency1 B/S Off 439.900 B/S On- B/S On+ Frequency2 COARSE B/S Off...
Page 56 TH-D75E (E, T) type Display Adjustment items Adjustment Frequency 6th line Major item Minor item item number adjustment (MHz) displayed F. BPF BPF A-Band VHF Frequency Low 136.050 RSSI Frequency Center 145.950 RSSI Frequency High 173.950 RSSI BPF A-Band UHF Frequency Low 410.050 RSSI...
Page 57 4.2.5 Common Section TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 1.Battery Voltage Goes to adjustment mode. Battery terminal [] or Note: The correct See "4.2.4 Adjustment [Write] transmission power Mode". will not be output from 1) Battery terminal: 7.4V the transceiver in...
Page 58 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 1. TX Frequency 6) Frequency2 COARSE B/S f. counter Encoder [] or 439.900MHz []/[] [Write] ±150Hz Frequency:439.900MHz Note: Before ad- Transmission justing this item, write 128 to "Frequency2 FINE B/S On+".
Page 59 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 2. Power 8) Power:Low Power meter Encoder [] or 0.5W ±0.05W Frequency:144.100MHz Ammeter []/[] [Write] 1.00A or less Transmission 9) Power:Low Power meter Encoder [] or 0.5W ±0.05W...
Page 60 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 3. MOD Gain Battery terminal: 7.4V/3.0A Linear detector Encoder [] or Transmit after 1) MOD Gain VHF []/[] [Write] writing 232. Then Frequency: 144.100MHz check that the de- Linear detector viation is...
Page 61 4.2.7 Transmitter Section: User Mode Confirmation Items TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 1. TX Frequency Battery terminal:7.4V/3.0A f. counter Check 439.900MH ±400Hz 1) Frequency: 439.900MHz Transmission 2. TX Power Battery terminal:7.4V/3.0A Power meter Check...
Page 62 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment 3.MIC sensitivity 1) Power: Low Linear detector Check 2.4~3.9kHz Frequency: 145.100MHz Oscilloscope Linear detector Audio analyzer LPF:15kHz HPF:OFF De-emphasis: OFF Audio analyzer AG:1kHz/8mV Transmission 2) Power: Low Linear detector...
Page 63 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment B-Band 7) Frequency: 118.050MHz [Auto] Automatic Max RSSI value SSG:-110dBm (0.707μV) Oscilloscope adjustment Mode:FM (3kHz) Audio analyzer AF output:0.63V/8Ω 8) Frequency: 145.950MHz [Auto] Automatic Max RSSI value SSG:-110dBm (0.707μV)
Page 64 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment B-Band 3) Frequency: 145.950MHz [] or Write SQL Level1 [Write] SSG:-122.5dBm (0.168μV) SSG:-117dBm (0.32μV) S-FULL SSG: -102dBm (1.77μV) 4) Frequency: 224.050MHz [] or Write SQL Level1 [Write]...
Page 65 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment B-Band 5) Frequency: 144.550MHz Check 12dB SINAD or more Mode: FM (3kHz) Audio analyzer SSG: -119.5dBm (0.237μV) Oscilloscope AF output: 0.63V/8Ω ATT:OFF 6) Frequency: 144.550MHz Check Less than 12dB Mode: FM (3kHz)
Page 66 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment B-Band 5) Frequency: 145.950MHz Check Open Squelch SQL :Level1 Oscilloscope Mode:FM (3kHz) SSG: -117dBm (0.32μV) 6) SSG: OFF Check Close Squelch Oscilloscope 7) Frequency: 223.550MHz Check Open Squelch SQL :Level1...
Page 67 TH-D75E (E, T) type Measurement Adjustment Specifications Item Condition Test- /Note Unit Terminal Unit Parts Method equipment B-Band 5) Frequency: 145.950MHz Check One or more seg- Mode:FM (3kHz) ments in S-meter SSG: -115dBm (0.4μV) light. 6) SSG: -100dBm (2.24μV) Check All segments in S-meter light.
Page 68: Section 5 Troubleshooting
SECTION 5 TROUBLESHOOTING Fault Diagnosis of the BGA (Ball Grid Array) IC Overview A flowchart for determining whether or not the transceiver can be powered on (the LCD does not function even if the power switch is turned on) due to broken BGA parts. BGA parts MAIN MPU (IC2005), LPDDR (IC2002), FLASH (IC2008) Checking Battery voltage...
Page 69 Pass The LCD display control Points to be checked Normal voltage The BGA parts are not broken. Fail 30M: 3.0V Remove R2142 (Side A) to check the voltage of the Side A IC2016 (1-pin) 30M. If the voltage becomes normal, re-insert the FPC of LCD module or replace the LCD module.
Page 70 Failure diagnosis of the Bluetooth section Overview: When the Bluetooth function (HSP: connection to headset, SPP: communication in MCP-D75 or terminal mode, etc.) does not operate, use this flowchart to determine the problem. Major parts for a Bluetooth circuit 33BT 18BT 33BT 18BT...
Page 71 Pass Check reference CLK: X2003 of the Fail Replace defective parts of the reference Fail The BT/GPS (IC2044) is defective. BT/GPS. (Check with the BT turned ON). generation circuit of BT/GPS as necessary. Replace the CONTROL PCB. Side B Between C2232 and C2233: Side A Q2014,R2290,R2303,R2307,R2308 Sine waves, 19.2 MHz, Side B X2003,C2227,C2232,C2233...
Page 72 Failure diagnosis of the GPS section Overview: When the GPS function does not operate, use this flowchart to determine the problem. Major parts for a GPS circuit 33BT 18BT 33BT 18BT - GPS Connector (J4) - SAW Filter (L2042) - BT/GPS (IC2044) UART UART Module...
Page 73 Pass Check that the control signal Fail Replace the R2284. (/GPS_SHUTDOWN) of the GPS is The MAIN MPU (IC2005) is defective if the at 1.8 V. condition does not return to normal. (Check with the GPS turned ON.) Replace the CONTROL PCB. Side A R2284: 1.8V Pass Check reference CLK: X2003 of the...
Page 74 Failure diagnosis of the PLL section Overview: The PLL IC is mounted inside the E700 (non-removable Board Level Shield) of the MAIN UNIT 2/5 (TX-RX PCB) Side B and cannot be replaced. When the PLL is unlocked, use this procedure to determine if the PLL IC is the cause. PLL IC Band A PLL IC: IC800, Band B PLL IC: IC700 Inspection procedure...
Page 75 PRECAUTIONS ON SCHEMATIC DIAGRAMS * Due to the improvement in performance, some part numbers shown in the circuit diagrams may not agree with those indicated in the Parts List. * The parts numbers, values and rated voltage etc. in the Schematic Diagrams are for reference only.
Page 76: Printed Circuit Board
PRINTED CIRCUIT BOARD MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 1/5: CONTROL --- Component side view/Side A (J7C-0427-00) --- IC2023 R2165 C2132 IC2035 C2168 C2192 R2202 C2181 R2161 R2162 C2195 C2194 R2201 R2200 IC2033 L2038 R2177...
Page 77 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 1/5: CONTROL --- Foil side view/Side B (J7C-0427-00) --- RTCK RTCK RTCK TL2038 TL2001 IC2009 Q2005 Q2011 C2165 R2219 R2151 R2231 R2072 R2365 R2265 C2202 C2228 Q2010 IC2020 R2210 R2207...
Page 78 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 2/5: TX-RX --- Component side view/Side A (J7C-0427-00) --- C149 R173 R172 Q108 C607 C148 R174 C918 J7C-0427-00 Q107 IC900 C611 TL800 R1100 R1101 XC1-388 C910 Q105 C909 C919...
Page 79 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 2/5: TX-RX --- Foil side view/Side B (J7C-0427-00) --- C857 L802 L810 R829 L111 L808 C858 C852 C834 C853 Q803 R833 R820 R828 L105 C831 C833 E800 L801 L809...
Page 80 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 3/5: MW/SW --- Component side view/Side A (J7C-0427-00) --- --- Foil side view/Side B (J7C-0427-00) --- R1715 C1723 Q1710 D1703 R1707 C1725 Q1711 Q1702 C1705 D1700 J7C-0427-00 J7C-0427-00 R1713...
Page 81 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 4/5: KEY --- Component side view/Side A (J7C-0427-00) --- --- Foil side view/Side B (J7C-0427-00) --- S1868 R1862 D1861 R1861 S1870 S1870 S1851 S1871 S1871 XC1-388 XC1-388 D1860 D1859...
Page 82: Level Diagram
D407 220M :5.4dBm RF SW 223.55MHz Q503 VHF: -43.5dBm VHF: -53.4dBm VHF: -53.5dBm 220M : -42.0dBm 220M : -46.0dBm -71.0dBm (TH-D75A only) (TH-D75A only) 220M :-54.5dBm Band B IF (58.05MHz) Band B AF (1kHz) 196mVrms 145.95MHz IC2011 Q402 Q404 CODEC -13.0dBm...
Page 83 Transmitter Section AF(1kHz) 509.1mVrms: VHF 141.4mVrms: VHF 141.4mVrms: UHF 509.1mVrms: UHF 509.1mVrms: 220M 141.4mVrms: 220M 5.7mVrms 14.7mVrms (TH-D75A only) (TH-D75A only) IC2027 IC2004 IC2011 (J2) CODEC C2052 C2128 C2197 MAIN UNIT(1/5) CONTROL I2S format AF(1kHz) RF(Center Frequency) signal 15.0dBm: VHF 25.0dBm: VHF...
Page 84: Schematic Diagram
SCHEMATIC DIAGRAM MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 3/5: MW/SW To MAIN UNIT(XC1-388) 2/5 TX-RX CN8 CN11 L1703 470n HF RX Band B RF AMP RF AMP 4.7V Band B 76-108MHz C1705 WFM RX:4.2V C1719 R1709 BARANT ON:1.9V...
Page 85 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 4/5: KEY S1851 KEY BACK LIGHT 21 Keys BACK LIGHT ON 5.1V S1852 S1856 S1860 S1864 S1868 S1853 S1857 S1861 S1865 S1869 S1854 S1858 S1862 S1866 S1870 S1855 S1859...
Page 86 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 1/5: CONTROL MAIN UNIT(XC1-388)1/5 CONTROL DESTINATION *R2078 XC1-388K-01 XC1-388E-01 VOLUME ENCODER ANALOG SW ON/OFF SW GND4 GND3 *R2079 IC2050 R2078 100k TX2+ 31BU R2079 100k RX2+ TX2- RX2- VBUS...
Page 87 MAIN UNIT (XC1-388K-01 (TH-D75A K type), XC1-388E-01 (TH-D75E E, T type)) 2/5: TX-RX UNDR V PROTECT SW UNDR V PROTECT LOGIC Q107,Q108 BATT CHG DC/DC SW BATT CHG DC/DC SW Q105 L112 7.3V L104 L105 D110 DC IN L110 DC IN...
Page 88 INTERCONNECTION DIAGRAM MAIN UNIT VOLUME ENCODER (XC1-388) 4/5 PARALLEL CORD SPEAKER 6-pin FPC 16-pin FFC MAIN UNIT GND4 50-pin FPC GND3 (XC1-388) 2/5 A12 GND TX2+ TX-RX DET1 2 2 DET1 A11 RX2+ TX2- A10 RX2- FTH 4 4 FTH VBUS VBUS CURR 6...
Page 89 1.8V BT/GPS 3.3V AVR 220T IC2018 33RA DC SW 12BU 1.2V AVR 220TS_ 18BT IC606 33RAS Q205 IC2026 220TS (TH-D75A only) /GPS_SHUTDOWN,/BT_SHUTDOWN LITHIUM CELL 33RB 3.3V AVR 430T DC SW IC503 430TS_ L2018,2020 3.0V AVR 33RBS Q203 L2023-2025 IC2025 IC2016...
Page 90: Parts List
PARTS LIST [TH-D75A, TH-D75E] * SAFETY PRECAUTION Parts identified by the symbol are critical for safety. Replace only with specified part numbers. * BEWARE OF BOGUS PARTS Parts that do not meet specifications may cause trouble in regard to safety and performance.
Page 91: Exploded View Of General Assembly And Parts List
Exploded view of general assembly and parts list Block No.M1MM MAIN UNIT (4/5) (KEY) MAIN UNIT (1/5) (CONTROL) MAIN UNIT (3/5) MAIN UNIT (2/5) (MW/SW) (TX-RX) MAIN UNIT (5/5) (BARANT) 3-2(No.RA096<Rev.001>)
Page 92: General Assembly
General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local A1A-0205-00 CHASSIS A6C-0199-00 PANEL B0K-0148-10 SIDE CAP B1A-0135-00 FRONT GLASS B1B-0262-00 ILL.GUIDE TX/BUSY B38-0960-25 LCD ASSY --------- NAME PLATE E0E-0027-10 C.RECEPTACLE-SM E3F-0139-20 FLAT CABLE KEY-CONT PCB E37-0810-45 PARALLEL CORD SPEAKER...
Page 93: Electrical Parts List
Electrical parts list  Symbol Part No. Part Name Description Local MAIN UNIT IC2015 XC6223D331G-G MOS IC Note 3 XC1-388K-01 (TH-D75A (K) type) IC2016 XC6223T3019 MOS IC Note 3 XC1-388E-01 (TH-D75E (E, T) type) IC2017 SN74AVC1T45CT MOS IC IC2018 XC6701B312E-G...
Page 94  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local Q403 3SK293F D100 RB531SM-30 DIODE Q404 3SK293F D101 RB531SM-30 DIODE Q405 LTC043ZEBFS8 DIGI TRANSISTOR D102 RB531SM-30 DIODE Q406 3SK293F D103 RB531SM-30 DIODE D104 RB715WM SCHOTTKY DIODE Q407 LTC043ZEBFS8...
Page 95  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local D2016 MSL0601RGBU D502 1SV325FT VARI CAP DIODE D504 BBY65-02V VARI CAP DIODE D2017 BBY65-02V VARI CAP DIODE D505 BBY65-02V VARI CAP DIODE D2018 BBY65-02V VARI CAP DIODE D506 1SV325FT...
Page 96  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local C164 CK73FXR1E226M C CAPACITOR 22uF 25V M C256 CK73JXR1H471K C CAPACITOR 470pF 50V K C165 CK73FXR1E226M C CAPACITOR 22uF 25V M C257 CC730EF1H102K C CAPACITOR 1000pF 50V K C166 CK73FXR1E226M C CAPACITOR...
Page 97  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local C433 CK73JXR1H471K C CAPACITOR 470pF 50V K C335 CC730EF1H070B C CAPACITOR 7pF 50V B C336 CC730EF1H101G C CAPACITOR 100pF 50V G C434 CK73JXR1H102K C CAPACITOR 1000pF 50V K C337 CC730EF1H270G C CAPACITOR...
Page 98  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local C535 CC730CC1H470G C CAPACITOR 47pF 50V G C638 CK73JXR1C103K C CAPACITOR 0.01uF 16V K C536 CK73JXR1H102K C CAPACITOR 1000pF 50V K C639 CC730CC1H470G C CAPACITOR 47pF 50V G C537 CC730CC1H050B C CAPACITOR...
Page 99  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local C759 CK73JXR1H102K C CAPACITOR 1000pF 50V K C760 CK73JXR1H102K C CAPACITOR 1000pF 50V K C901 CC730CC1H680G C CAPACITOR 68pF 50V G C761 CK73JXR1H102K C CAPACITOR 1000pF 50V K C902 CK73JXR1H681K C CAPACITOR...
Page 100  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local C1109 CK73HXR1C105K C CAPACITOR 1uF 16V K C2018 CK73JXR1C104K C CAPACITOR 0.1uF 16V K C2019 CC73JCH1H101J C CAPACITOR 100pF 50V J C1110 CK73JXR1C104K C CAPACITOR 0.1uF 16V K C1111 CK73JXR1H102K C CAPACITOR...
Page 101  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local C2088 CK73JXR1H102K C CAPACITOR 1000pF 50V K C2154 CK73HXR1C105K C CAPACITOR 1uF 16V K C2089 CK73GXR0J106M C CAPACITOR 10uF 6.3V M C2155 CK73HXR1C105K C CAPACITOR 1uF 16V K C2090 CK73GXR0J106M C CAPACITOR...
Page 102  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local C2230 CK73HXR1A225K C CAPACITOR 2.2uF 10V K C2231 CK73HXR1A225K C CAPACITOR 2.2uF 10V K C2299 CK73JXR1H471K C CAPACITOR 470pF 50V K C2232 CC730CC1H220G C CAPACITOR 22pF 50V G C2301 CK73GXR0J106M C CAPACITOR...
Page 103  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local R149 RK73JB1H224J MG RESISTOR 220kΩ 1/20W J R150 RK73JB1H334J MG RESISTOR 330kΩ 1/20W J R243 RK73JB1H472J MG RESISTOR 4.7kΩ 1/20W J R151 RK73JB1H100J MG RESISTOR 10Ω...
Page 104  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local R431 RK73JB1H104J MG RESISTOR 100kΩ 1/20W J R529 RK73JB1H152J MG RESISTOR 1.5kΩ 1/20W J R530 RK73JB1H182J MG RESISTOR 1.8kΩ 1/20W J R434 RK73JB1H104J MG RESISTOR 100kΩ...
Page 105  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local R628 RK73JB1H560J MG RESISTOR 56Ω 1/20W J R825 RK73JB1H222J MG RESISTOR 2.2kΩ 1/20W J R630 RK73JB1H470J MG RESISTOR 47Ω 1/20W J R826 RK73JB1H000J MG RESISTOR 0Ω...
Page 106  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local R1038 RK73JB1H681J MG RESISTOR 680Ω 1/20W J R1039 RK73JB1H101J MG RESISTOR 100Ω 1/20W J R1163 RK73JB1H101J MG RESISTOR 100Ω 1/20W J R1040 RK73JB1H470J MG RESISTOR 47Ω...
Page 107  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local R2014 RK73JB1H224J MG RESISTOR 220kΩ 1/20W J R2090 RK73JB1H334J MG RESISTOR 330kΩ 1/20W J R2015 RK73JB1H124J MG RESISTOR 120kΩ 1/20W J R2091 RK73JB1H104J MG RESISTOR 100kΩ...
Page 108  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local R2167 RK73JB1H473J MG RESISTOR 47kΩ 1/20W J R2168 RK73JB1H472J MG RESISTOR 4.7kΩ 1/20W J R2246 RK73JB1H101J MG RESISTOR 100Ω 1/20W J R2169 RK73JB1H102J MG RESISTOR 1kΩ...
Page 109  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local R2319 RK73HB1J181J MG RESISTOR 180Ω 1/16W J L106 LB73F0AH-003 CHIP FERRITE L107 LB73F0AH-003 CHIP FERRITE R2320 RK73JB1H182J MG RESISTOR 1.8kΩ 1/20W J L108 LB73F0AH-003 CHIP FERRITE R2321 RK73HB1J220J...
Page 110  Symbol  Symbol Part No. Part Name Description Local Part No. Part Name Description Local L406 LR79G0CQ27NG CHIP INDUCTOR L407 LR79G0CQ10NG CHIP INDUCTOR L2001 L3D-0074-04 CHOKE COIL L408 LR79G0CQR39G CHIP INDUCTOR L2002 LB73G0DV-001 CHIP FERRITE L409 LR79G0CQ47NG CHIP INDUCTOR L2003 LK73G0BA100K M.CHIP INDUCTOR...
Page 111: Phone Jack
 Symbol Part No. Part Name Description Local CN501 G0B-0067-00 EARTH SPRING E200 F0B-0097-00 RADIATION PLATE E700 --------- SHIELDING CASE Note 2 E800 --------- SHIELDING CASE Note 2 E2000 F10-3236-05 SHIELDING CASE E2001 F10-3228-15 SHIELDING CASE FZA10BQ-4R0 FUSE (CC) 4.0A FZA10BQ-4R0 FUSE (CC) 4.0A...
Page 112: Packing Materials And Accessories Parts List
Packing materials and accessories parts list Block No.M2MM 3, 4 E Type K/T Type T Type K Type E Type K Type: TRI BAND E/T Type: DUAL BAND Packing and accessories Block No. [M][2][M][M]  Symbol No. Part No. Part Name Description Local B5A-4344-00...
Page 113  Symbol No. Part No. Part Name Description Local T9A-0034-00 WHIP ANTENNA ACC, TRI BAND D75AK T90-1106-05 WHIP ANTENNA ACC, DUAL BAND D75EE,D75ET W0H-0160-00 AC ADAPTER (CC) ACC, K-TYPE D75AK W0H-0161-00 AC ADAPTER (CC) ACC, E-TYPE D75EE W0H-0162-00 AC ADAPTER (CC) ACC, T-TYPE D75ET ---------...
Page 114 JVCKENWOOD Corporation Communications Systems Division (No.RA096<Rev.001>) Printed in Japan...

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