Kenwood TK 372G Diagram

UHF FM TRANSCEIVER

TK-372G

SERVICE MANUAL

Antenna (KRA-15: Option)

B51-8561-00(S) 790

Knob (ENC) (K29-5331-03)

Knob (VOL) (K29-5332-03)

Knob (PTT) (K29-5334-13)

Knob (Side1) (K29-5333-13)

CONTENTS

GENERAL ......................................................................2

SYSTEM SET-UP .......................................................... 2

OPERATING FEATURES..............................................3

REALIGNMENT ............................................................. 7

DISASSEMBLY FOR REPAIR..................................... 15

CIRCUIT DESCRIPTION .............................................16

SEMICONDUCTOR DATA ..........................................20

DESCRIPTION OF COMPONENTS............................ 22

PARTS LIST.................................................................23

EXPLODED VIEW .......................................................31

PACKING .....................................................................32

Cabinet assy (A02-3568-23)

Key top (K29-9043-02)

ADJUSTMENT .............................................................33

PC BOARD VIEWS

DISPLAY UNIT (X54-3250-10)............................... 45

TX-RX UNIT (X57-588X-XX)..................................47

SCHEMATIC DIAGRAM .............................................. 53

BLOCK DIAGRAM ....................................................... 57

LEVEL DIAGRAM ........................................................ 59

KNB-14/KNB-15A (Ni-Cd BATTERY) ..........................60

OPTIONS .....................................................................61

SPECIFICATIONS ................................... BACK COVER

TK-372G

GENERAL / SYSTEM SET-UP

INTRODUCTION

SCOPE OF THIS MANUAL

This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of the publication date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as required.

ORDERING REPLACEMENT PARTS

When ordering replacement parts or equipment information, the full part identification number should be included. This applies to all parts, components, kits, or chassis. If the part number is not known, include the chassis or kit number of which it is a part, and a sufficient description of the required component for proper identification.

Unit

Model &

destination

TK-372G

TX-RX Unit Display Unit Frequency range Remarks

K X57-5880-11 450~470MHz K2 X57-5880-16 K3 X57-5880-17 490~512MHz LOC : 50.4MHz K4 X57-5880-13 403~430MHz

X54-3250-10

470~490MHz IF1 : 44.95MHz

PERSONNEL SAFETY

The following precautions are recommended for personnel

safety:

●

DO NOT transmit until all RF connectors are verified secure and any open connectors are properly terminated.

●

SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive atmosphere.

●

This equipment should be serviced by a qualified technician only.

SERVICE

This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and alignment procedures contained within.

SYSTEM SET-UP

Merchandise received

License and frequency allocated by FCC

Choose the type of transceiver

Transceiver programming

Are you using the optional antenna?

Are you using the speaker microphone?

Delivery

Frequency range (MHz) RF power Type

TX/RX 450~470

TX/RX 470~490

TX/RX 490~512

TX/RX 403~430

A personal computer (IBM PC or compatible), programming interface (KPG-22), and programming software (KPG-56D) are required for programming. (The frequency, TX power HI/LOW, and signalling data are programmed for the transceiver.)

YES

KRA-15

Whip antenna

(Option)

KMC-17 or KMC-21

Speaker microphone

(Option)

4.0W

TK-372G K

TK-372G K2

TK-372G K3

TK-372G K4

1. Operation Features

Antenna

Speaker

OPERATING FEATURES

o Display

Note: The PF ke ys are prog rammed with default functions:

•

Side 1 key: Lamp

•

Side 2 key: Monitor A

•

Microphone

key: Scan

•

key: Scan Del/Add

•

key: Talk Around

•

key: RF Power Lo

TK-372G

tt yy

The transceiver is shown with the optional KNB-14 battery pack.

q Rotary encoder

Your dealer can program the encoder as either Group Up/Down (only when the trunking board is installed) or Channel Up/Down (default setting). Rotate to select a group or channel. Also rotate to adjust the squelch in Squelch Adjustment mode.

w LED indicator

Lights red while transmitting. Lights green while receiving. Flashes orange while receiving a Code Squelch or Selective Call code, or a 2-Tone or DTMF signal that matches the one set up in your transceiver . Flashes red when the battery power is low while transmitting.

e Power switch/ Volume control

Turn clockwise to switch ON the transceiver. Rotate to adjust the volume. To switch OFF the transceiver, turn counterclockwise fully.

r PTT (Push-to-Talk) switch

Press this switch, then speak into the microphone to call a station.

t Side 1 key

This is a PF (Programmable Function) key. Press it to activate its auxiliary function.

y Side 2 key

This is a PF (Programmable Function) key. Press it to activate its auxiliary function.

, •,

3 keys

These are PF (Programmable Function) keys.

Press each key to activate its auxiliary function.

i SP/MIC jacks

Connect an optional speaker/ microphone here.

Programmable Auxiliary Functions Side 1, Side 2, °, •,

2, and

3 can be programmed

with the auxiliary functions listed below.

• Channel Down

• Channel Up

• Display Character

• Group Down

• Group Up

• Home Channel

• Key Lock

• Lamp

• Monitor A (Monitor Unmute–Momentary)

• Monitor B (Monitor Unmute–Toggle)

• Monitor C (Carrier Squelch–Momentary)

• Monitor D (Carrier Squelch–Toggle)

• None

• Operator Sel Tone

• Redial

• RF Power Lo

• Scan

• Scan Del/Add

• Talk-Around

• 2-Tone Encode

• Trunking Group Code Select

Availab le for K market models only.

Availab le only when using Trunking function.

2. Programmable keys

The functions the FPU programs to the function keys are

described in the following sections.

1) Channel up/down

When the key is pressed each time, the channel number to be selected is incremented/decremented and repeats if held for one second or longer.

2) Display character

This key switches the LCD display between the group/ channel number and group/channel name.

3) Group up/down

When the key is pressed each time, the group number to be selected is incremented/decremented and repeats if held for one second or longer.

TK-372G

OPERATING FEATURES

4) Home Channel

Press this key once, the channel switches to the preprogrammed home channel.

5) Key lock

When the KEY LOCK switch is held down for one second or more, keys other than [PTT], [Side1], [Side2], [VOL], [POWER], and KEY LOCK are locked. When 12/16 KEY LOCK is set with the FPU, the DTMF key is locked and when front-panel KEY LOCK is set, the DTMF key and the [PF] key are locked.

6) Lamp

This key illuminates the LCD and keys on the front panel. When the key is pressed, the LED lamp goes on. When it is released, the lamp goes off after about five seconds. If any key is pressed while the LED lamp is on, the lamp is kept on for five seconds.

7) Monitor

Used to release signalling or squelch when operating in conventional mode. It is also used to reset option signalling.

8) Operator Selectable Tone

This key switches the pre-set decode QT/DQT and encode QT/DQT to OST (Operator Selectable Tone) tone pair. Press this key, the transceiver enters OST mode. In this mode, the display shows "OFF" and the operator can select one of the OST tone pair using the tuning control. The display shows "TONE ∗∗" and tone pair No. ∗∗ is selected. Press OST key again, the transceiver exits from OST mode, and returns to the group/channel mode. 16 tones pair for OST can be programmed by KPG-56D. OST is useful to access the repeater with same radio frequency and different tone (QT/DQT).

9) 2-Tone Encode Select

1 Press the key programmed as 2-tone Encode Select.

• A pre-programmed 2-tone code name appears on the display.

2 Press the key programmed as Rotary encoder to select

you desired 2-tone code name.

3 Press PTT switch and 2-Tone Encode Select key to transmit

and release them to receive.

10) RF power low

Used to temporarily switch transmission output to low power. Turning the function on enables:

Hi→Low, Low→Low Key states are backed up, except in the PC mode when they are reset.

The "Add" channel is contained in the scan sequence, the "Delete" channel is not contained. In the scan mode, this key switches the channel between delete or add, temporarily.

13) Talk Around

Press this key, the transceiver uses the receive frequency and tone for transmission. The operator can call the other party directly (without repeater). Press this key again, the talk around function goes off.

14) None

An error operation beep sounds, and no action will occur. Use this function when the transceiver is required to be operated more simply.

3. Display

Icon Description

Appears while using Smar Trunk. Appears when the selected channel is

busy. Appears when QT, DQT, DTMF, or 2Tone decoding is deactivated (by pressing the Monitor key). Appears when you receive a Code Squelch, Selective Call, 2-Tone, or DTMF Signallling call. Also appears when you transmit using Code Squelch or Selective Call.

Appears while scanning. Appears when using low power on the

selected channel. Appears when the selected channel is included in the scanning sequence. Displays the selected channel, the squelch level, DTMF digits (when entering digits, confirming digits, or making a call), and messages received via Selective Call.

11) Scan

Pressing this key starts scanning. Pressing this key again stops scanning.

12) Scan Del/Add

This key switches the currently displayed channel between "Delete" and "Add".

4. Scan Operating

1) Scan types

●

Single Group Scan

You can scan all valid (ADD) channels in the displayed group

that can be selected with the group selector.

OPERATING FEATURES

TK-372G

●

Multiple Group Scan

You can scan all valid (ADD) channels in all valid (ADD)

groups.

2) Scan Start Condition

One or more non-priority channels must be added to all channels that can be scanned. The transceiver must be in normal receive mode (PTT off).

When you activate the key programmed to the scan function, scan starts. The scan icon ("SCN") lights and "SCAN" is indicated on display.

3) Scan Stop Condition

The scan stops temporarily if the following conditions are satisfied. 1 The receiving signal matches the signalling code in your

radio that is set by the programming software (KPG-56D).

2 When the monitor key is depressed.

4) Scan Channel Types

1 Priority channel is the most important channel for scan,

and always detects a signal during scan and when the scan stops temporarily.

2 Non-priority channels detect a signal during scan. For the

channels that can be selected with the group or channel selector when the scan does not occur, the "A" icon lights.

5) Priority Channel Setting

A priority channel can be set as follows with the programming software (KPG-56D).

1 Specify a priority channel as a fixed priority channel. 2 Make a selected channel a priority channel.

Specify the initial channel before the operator changes it.

6) Scan Type According to the Priority Channel

1 When no priority channel is set : Only the non-priority

channels are scanned.

If a non-priority channel stops temporarily, it stops until

there is no signal on the channel.

2 When priority channel is set : Either priority channel is

scanned.

If a non-priority channel stops temporarily, a priority channel

signal is detected at certain intervals.

If a priority channel stops temporarily, it stops until there is

no signal on the priority channel.

7) Revert Channel

The revert channel is used to transmit during scanning and set by the programming software (KPG-56D). 1 Priority

The transceiver reverts to the priority channel.

2 Priority with talkback

The transceiver reverts to the priority channel. If you press PTT during a resume timer (dropout delay time,

TX dwell time) or calling, you can transmit on the current

channel to answer to the call however revert channel is set to priority channel.

After resume time, scan re-starts and the transmission

channel returns to the priority channel.

3 Selected channel

The transceiver reverts to the channel before scanning or

the channel that you changed during scan.

4 Last called channel

The transceiver reverts to the last called channel during

scan.

5 Last used channel

The transceiver reverts to the last used (transmitted) channel during scan. "Last used" revert channel includes talkback function.

6 Selected with talkback

The transceiver reverts to the channel before scanning or the channel that you changed during scan.

8) Scan End

When you reactivate the key programmed to the scan

function during scan mode, scan ends.

The scan icon ("SCN") and "SCAN" or revert channel

(programmable) display goes off.

9) Temporarily Delete/Add

It is possible to delete or add a channel temporarily during scan. When scan stops on an unnecessary channel, for example by interference of the other party, press the delete/ add key, then that channel is deleted temporarily and scan will re-start immediately.

When you would like to add a deleted channel temporarily to the scan sequence, select the desired (deleted) channel during scan, and press the delete/add key before scan re-starts.

That channel is added temporarily to the scan sequence.

The temporarily deleted or added channels are returned to their pre-set delete/add conditions when the transceiver exits from scan mode.

5. Details of Features

1) Time-out timer

The time-out timer can be programmed in 15 seconds increments from 15 seconds to 300. If the transmitter is keyed continuously for longer than the programmed time, the transmitter is disabled and a warning tone sounds while the PTT button is held down. The alert tone stops when the PTT button is released.

2) PTT ID

PTT ID provides a DTMF ANI to be sent with the PTT button every time it is used (Begin of TX ID at beginning of transmission, End of TX ID at end of transmission, or both).

You can program the PTT ID as one of the followings.

Off, BOT (Begin of TX ID), EOT (End of PTT ID), BOTH.

The contents of ID are programmed for each channel.

TK-372G

OPERATING FEATURES

The transceiver is capable of having ID. The format is DTMF. The timing that the transceiver sends the ID is

programmable.

Begin of TX ID (BOT) :Begin of TX ID is sent at the

beginning of transmission.

End of TX ID (EOT) : End of TX ID is sent at the end of

transmission.

Both : Begin of TX ID is sent at the beginning of transmission

and End of TX ID is sent at the end of transmission.

There is also a "PTT ID" setting for each channel.

3) Battery Warning

This transceiver has a battery warning feature. If low voltage is detected during transmission, the transceiver warns you by a flashing red "LED".

When the voltage is detected to be even lower during transmission, the transceiver stops transmission and warns you by a flashing red "LED" and a beep.

Please notice "indication" for the battery exchange, charging time by flashing red LED and beep.

4) "TOT" Pre-Alert

The transceiver has a "TOT" pre-alert timer. This parameter selects the time at which the transceiver generates a "TOT" pre-alert tone before the "TOT" is expired.

"TOT" will expire when the selected time passes from the TOT pre-alert tone.

5) "TOT" Re-Key Time

The transceiver has a "TOT" re-key timer. This timer is the time you cannot transmit after the "TOT" is exceeded. After the "TOT" re-key time expires you can transmit again.

6) "TOT" Reset Time

The transceiver has a "TOT" reset timer. This timer is the minimum wait time allowed during a transmission that will reset the "TOT" count.

"TOT" reset time causes the "TOT" to continue even after the PTT is released, unless the "TOT" reset timer has expired.

7) OST (Operator Selectable Tone)

The transceiver is capable of having the "OST" function and 16 tone pairs (QT/DQT) with a max 10-digit name for each tone pair.

8) Clear to Transpond

The transceiver waits for an acknowledgment signal until the channel become free.

This feature ensures the acknowledgment signal is receive by another party.

9) Battery Save

This is the automatic battery saver during standby mode operation. The receiver circuit is turned on and off to conserve the battery life.

6. Option Signalling (DTMF/2 tone)

Built-in DTMF decoder is available for option signalling. Built-in 2-Tone decoder is available for option signalling.

It is possible to use individual call, group call, DBD (Dead

Beat Disable). Note : DBD is only DTMF

Preset operation is triggered when there is match with Option

Signaling.

When Option Signaling matches on a Group Channel where it is set to Yes, the Option Signaling display flashes and Option Signaling is canceled. Settings after this will cause "Transpond" or "Alert" to sound.

Setting the Selective Call Alert LED will cause the LED to start flashing orange.

Mute or Unmute is triggered by the ID/QT/DQT/Carrier when option signaling matches (when Option Signal is deactivated by a transmission).

AND/OR

Option Signaling match conditions can be selected with AND/OR logic.

Alert/Transpond AF Mute Open

AND

DTMF.

match with DTMF.

a match just by receiving the carrier.

Auto Reset

it is set to Yes, Option Signaling is canceled when it matches a group channel set to Yes.

automatically Reset after a specified time.

Dead Beat Disable

preset operation is performed.

whether Option Signaling = Yes/No, then TX Inhibit or TX RX Inhibit is activated by the settings performed afterwards. D.B.D is canceled when the D.B.D. code + "#" is received.

matches. Alert is not output. An Option Signaling match is not displayed.

Triggers at match with QT/ Triggers at match with QT/ DQT/ID+DTMF(2tone);Opt

Triggers at match with Triggers only for match with DTMF(2tone) ; Opt

Even if set as OR, there is no Alert/Transpond just with

Even if set as OR, AF mute cannot be canceled just by a

In conventional channels not set with QT/DQT, signaling is

When Option Signaling matches on a Group channel where

After Option Signaling matches, Option Signaling can

When the D.B.D (Dead Beat Disable) code matches, a

When D.B.D matches on all group channels regardless of

Transpond is always activated when the D.B.D code is a

DQT/ID+DTMF(2tone);

QT/DQT/ID;Signaling

Opt

TK-372G

OPERATING FEATURES

7. Audible user feedback tones

The transceiver outputs various combinations of tones to notify the user of the transceiver operating state. The main tones are listed below

The high tone is 1477Hz, the mid tone is 941Hz, and the low tone is 770Hz.

• Power on tone

This tone is output when the transceiver is turned on. (The high tone is output for 500ms.)

• Alert tone

This tone is output when the transceiver is in TX inhibition for TOT, battery warning and PLL unlocked. It is output until the PTT button is released. (The 697Hz tone is output.)

• Busy Tone

This informs the user of a busy channel lock out

• Group Call Tone

The group call tone informs the user of a group call in DTMF/

2 Tone Option Signaling. This tone repeats 7 times.

770Hz 770Hz

30ms 30ms 30ms

• Individual Tone

Individual tone is issued on receiving selective call by DTMF/

2 Tone Option Signaling.

2000Hz 2000Hz 2000Hz

100ms 100ms 100ms 100ms 100ms

• Pre Alert tone

Informs the user when nearing transmit inhibit (transmit

cutoff) time due to TOT.

The Pre Alert Tone is issued from the time set for TOT Pre

Alert until the TOT triggers.

1633Hz 1633Hz 1633Hz

50ms 50ms 50ms 50ms 50ms

/ REALIGNMENT

REALIGNMENT

1. Modes

User mode

Panel test mode

PC mode

Firmware programming mode

Clone mode

Self programming mode

Mode Function

User mode For normal use. Panel test mode Used by the dealer to check the

Panel tuning mode Used by the dealer to tune the radio. PC mode Used for communication between the

Data programming Used to read and write frequency data mode PC test mode Used to check the radio using the PC.

Firmware program- Used when changing the main ming mode program of the flash memory. Clone mode Used to transfer programming data

Self programming Frequency, signalling and features. mode

2. How to Enter Each Mode

Mode Operation

User mode Power ON Panel test mode PC mode Received commands from PC Panel tuning mode [Panel test mode]+[°] Firmware programming mode

Clone mode [Side1]+[3]+Power ON

Self programming mode [Side1]+[

Panel tuning mode

Data programming mode

PC test mode

Checksum

fundamental characteristics.

radio and PC (IBM compatible).

and other features to and from the radio.

This feature is included in the FPU. See panel tuning.

from one radio to another.

[2]+Power ON (Two seconds)

[Side1]+[Side2]+Power ON (Two seconds)

(Two seconds)

PC tuning mode

]+Power ON

•

3. For the panel Test Mode

For the setting method, refer to ADJUSTMENT.

3-1. For the panel Tuning Mode

For the setting method, refer to ADJUSTMENT.

TK-372G

REALIGNMENT

4. Checksum

Executing this function, "TUNING" appears on the display

of TK-372G while calculating the checksum .

When the calculation is completed, the display returns to

normal and PC displays the checksum of the radio.

5. PC Mode

5-1. Preface

The TK-372G transceiver is programmed using a personal computer, a programming interface (KPG-22) and programming software (KPG-56D).

The programming software can be used with an IBM PC or compatible. Figure 1 shows the setup of an IBM PC for programming.

5-2. Connection procedure

1. Connect the TK-372G to the personal computer with the

interface cable.

2. When the POWER is switched on, user mode can be

entered immediately. When the PC sends a command, the radio enters PC mode. When data is transmitted from transceiver, the red LED blink. When data is received by the transceiver, the green LED blinks.

IBM-PC

Notes:

• The data stored in the personal computer must match model type when it is written into the flash memory.

• Change the TK-372G to PC mode, then attach the interface cable.

5-3. KPG-22 description

(PC programming interface cable: Option)

The KPG-22 is required to interface the TK-372G to the computer. It has a circuit in its D-subconnector (25-pin) case that converts the RS-232C logic level to the TTL level.

The KPG-22 connects the SP/MIC connector of the TK372G to the computers RS-232C serial port.

5-4. Programming software description

The KPG-56D programming disk is supplied in 3-1/2” disk format. The software on this disk allows a user to program the TK372G radios via a programming interface cable (KPG-22).

5-5. Programming with IBM PC

If data is transferred to the transceiver from an IBM PC with the KPG-56D, the destination data (basic radio information) for each set can be modified. Normally, it is not necessary to modify the destination data because their values are determined automatically when the frequency range (frequency type) is set.

The values should be modified only if necessary. Data can be programmed into the flash memory in RS-232C format via the universal connector.

KPG-56D installation manual part No. : B62-1153-XX

KPG-56D

RF Power meter or SSG

6. Firmware Programming Mode

6-1. Preface

Flash memory is mounted on the TK-372G. This allows the TK-372G to be upgraded when new features are released in the future. (For details on how to obtain the firmware, contact Customer Service.)

6-2. Connection procedure

Connect the TK-372G to the personal computer (IBM PC or compatible) with the interface cable (KPG-22). (Connection is the same as in the PC Mode.)

6-3. Programming

1. Start up the programming software (KPG-56D), select

"firmware program" in the "Program" item, and press the Return key on your personal computer. This starts up the firmware programmer.

KPG-22

}

MIC

}

Tuning cable (E30-3216-05)

Gray Gray/Black

1.5D-XV Lead wire Gray-XV Shield wire

Fig. 1

2. The top screen is displayed. Press any key to advance to the next screen.

3. Set the communications speed (normally, 57600 bps) and communications port in the Setup item.

4. Set the firmware to be updated by File select (=F1).

5. Hold down the [Side1] and [Side2] switches on the TK-372G, and press the power switch. When the [Side1] and [Side2] switches are held down for two seconds, "PROG 576" appears on the display and the LED lights orange. When "PROG 576" is displayed, release the switches.

6. Check the connection between the TK-372G and the personal computer, and make sure that the TK-372G is in Program mode.

REALIGNMENT

TK-372G

7. Press F10 on the personal computer. A window opens on the display to indicate the writing progress. When the TK372G begins to receive data, the LED lights green.

8. When data is received successfully, a checksum appears on the display.

9. If you want to continue programming other TK-372Gs, repeat steps 5 to 8.

Notes:

●

To start the Firmware Programmer from KPG-56D, the Fpro path must be set up by the KPG-56D Setup.

●

This mode cannot be entered if the Firmware Programming mode is set to Disable in the Programming software (KPG56D).

●

When programming the firmware, it is recommend to copy the data from the floppy disk to your hard disk before you update the radio firmware. Directly copying from the floppy disk to the radio may not work because the access speed is too slow.

6-4. Function

1. If you press the [Side2] switch while "PROG XXX" is displayed, the checksum is displayed. If you press the [Side2] switch again (while the checksum is displayed), "PROG XXX" is redisplayed.

2. A transmission speed can be selected by pressing the [Side1] switch while "PROG XXX" is displayed. 19200 bps: The LED flashes green and red alternately.

38400 bps: The LED flashes orange. 57600 bps: The LED lights orange.

Note:

Normally, write in the high-speed mode.

Note: You can clone the programmed data between the

transceiver frequency version must be same. Use the new clonig cable for TK-372G. You cannot use the old cloning cable for TK-360/370.

Cloning cable parts No.

E30-3410-05 (TK-372G → TK-372G)

PTT/RXD

3.5

GND REMOTE/TXD

2.5

Cloning cable

2.5

3.5

Fig. 2

8. Self Programming Mode

Write mode for frequency data and signalling etc. Mainly

used by the person maintaining the user equipment.

8.1 Self programming mode setting

Remove D17 from the TX-RX unit (Figure 3) (K, K4 models only). Hold down the [Side1]+[●] switches and turn the power switch on. When the self programming mode is entered, [SELF] appears on the display. The mode changes automatically to Model Select Mode and “PORTABLE” is displayed in about one second.

7. Clone Mode

Programming data can be transferred from one radio to another by connecting them via their SP/MIC connectors. The operation is as follows (the transmit radio is the master and the receive radio is the slave).

1. Turn the master TK-372G power ON with the [Side1]+[3]

key held down. The TK-372G displays "

2. Power on the slave TK-372G.

3. Connect the cloning cable to the SP/MIC connectors on

the master and slave.

4. Press the [

CLONE ". The data of the master is sent to the slave. While the slave is receiving the data, "-PC-" is displayed. When cloning of data is completed, the master displays "END", and the slave automatically operates in the User mode. The slave can then be operated by the same program as the master.

5. The other slave can be continuously cloned. When the [ key on the master is pressed while the master displays "END", the master displays " operation in steps 2 to 4.

] key on the master while the master displays

CLONE ". Carry out the

CLONE ".

Note :

This mode (self programming mode) cannot be set when it

has been disabled with the FPU.

Note :

Self Programming is disabled if "a Trunking Board is

installed in this Radio" is selected in FPU.

X57-588X Compoent Side

]

D17

Fig. 3

TK-372G

●

Flow Chart

Radio type

[2]

Self programming mode

[Side2]

Channel set mode

Function set mode

8-2. Channel Setting Mode

This is a mode for making channel settings with the panel

keys without using the FPU.

Pressing [Side2] when "SELF" is displayed, sets Channel Setting Mode. Select an item set using [3] then change the selection with the encoder. The data displayed using [2] is stored in the memory and then proceeds to the next item. Pressing [3] proceeds to the next item without storing it in the memory. Press [Side2] to set the display to "SELF" and return to reset (default) status. All channel data is cleared when pressing [2] key with the blank RX frequency.

No. Function Choices Display Remarks

Select Channel

RX frequency

Rx Signaling

TX frequency

TX Signaling

1-128 Step 2.5kHz-1MHz

Blank

100.0000-

550.0000MHz 50Hz digit (On=5; Off=0). OFF ————[Side1 QT 67.0-250.3Hz (EIA Mode) QT 67.0-250.3Hz (0.1Hz Step Mode) DQT 000-777 (Normal) (1 Step Mode) DQT 023-754 (Normal) (Standard Table Mode) DQT 000-777 (Inverse) (1 Step Mode) DQT 023-754 (Inverse) (Standard Table Mode) Step 2.5kHz-1MHz

Blank

100.0000-

550.0000MHz

_1-_1._ _1-128._ STP_250 STP_1000

————

R.100.0000

QT_67.0_ QT_250.3_ QT_67.0* QT_250.3* DQT000N* DQT777N* DQT023N DQT754N DQT000I* DQT777I* DQT023I DQT754I STP_250 STP_1000 T. ———— T.100.0000

Same as RX signaling.

[Side1]

We recomend up to 32 CH for TK-372G. Display when an item is selected or when a step is changed (about 0.5 seconds)

] Step change

[

•

UHF : 5.0,6.25kHz,1MHz,Step [Side1] : Freq On/Blank switching The rightmost dot indicates

] : Off/QT/DQT switching [•] : Mode switching [°] :

Normal/Inverse

switching

Same as RX frequency.

REALIGNMENT

No. Function Choices Display Remarks

Option Signaling OFF

6ID

Busy Channel Lockout

Beat shift

RF Power

Wide/Narrow

Scan Delete/ADD

Priority Channel

Home Channel

Compander

PTT ID

Begin of TX ID

END of TX ID

*1. There is no keys, so it can’t be changed.

NONE____ Default DTMF 2-TONE 0009999999999 (about 0.5 seconds)

Blank ———— NO YES No Yes High Power Low Power Wide WIDE_ Narrow DELETE ADD No Yes No Yes No Yes OFF Begin of TX End of TX Both 0009999999999999999

Blank 0009999999999999999

Blank ————

DTMF____

2TONE___

___ID___

12345678

——987 Display when a code is input

BCL_NO__

BCL_YES

SHFT_NO_

SHFT_YES

PWR_H___

PWR_L___

NARROW_

SCAN_DEL

SCAN_ADD Default

P.CH_NO__ Not used when (Scan) Priority is not Fixed.

P.CH_YES_

H.CH_NO__

H.CH_YES_

COMP_NO_

COMP_YES

P.ID_OFF

P.ID_1

P.ID_2

P.ID_3

_BOT_ID_

12345678

——987

————

_EOT_ID_

12345678

——987

Display when an item is selected Display of the current setting

(If it is 8 or more digits, scroll it.) (Input it with DTMF key.) *1

[Side1] : Data clear

Default

BCL_YES for K, K4 type

Default Default

K, K4, destination only

Not used when Home Channel is not set in Key Assignment.

Not valid if Dial ID =Disable and PTT ID=OFF, or EOT is set. Display when an item is selected (about 0.5 seconds) Display of the current setting (If it is 8 or more digits, scroll it.) Display when a code is input (Input it with DTMF key.) *1 [Side1] : Data clear Not valid if Dial ID=Disble and PTT ID=OFF, or BOT is set. Display when an item is selected (about 0.5 seconds) Display of the current setting (If it is 8 or more digits, scroll it.) Display when a code is input (Input it with DTMF key.) *1 [Side1] : Data clear

●

Flow Chart

Channel Setting Mode

Self programming mode

TK-372G

REALIGNMENT

8-3. Function Setting Mode

This is a mode for using the panel keys to make function

settings without using the FPU, that operate on all channels.

PTT ID

[Side2]

[2]

OFF

[Side1]

[2]/[3]

OFF

[Side1]

[2]/[3]

OFF

[Side1]

[2]/[3]

OFF QT DQT N DQT I

[Side1]

[2]/[3]

Data clear

[Side1]

[2]/[3]

Not used when (Scan) Priority is not Fixed.

[2]/[3]

Not used when Home Channel is not set in key Assignment.

[2]/[3]

Data clear

[Side1]

[2]/[3]

Data clear

[Side1]

[2]/[3]

[Side2]

Channel set mode Channel selection

[Side2]

RX frequency

RX signaling

TX freguency

TX signaling

option signaling

Busy channel lockout

Best Shift yes/no

RF Power High/Low

Wide/Narrow

Scan delete/add

Priority channel

Home channel

Compander yes/no

Begin of TX ID

End of TX ID

[2]

Channel delete

[Side1]

QT DQT N DQT I

[Side1]

Not valid if Dial ID=Disable and PTT ID=off, or EOT is set.

Not valid if Dial ID=Disable and PTT ID=off, or BOT is set.

[Side1]

[ ]

Pressing the [Side1] when "SELF" is displayed, sets the Function Setting Mode. Select an item set using [3] then change the selection with the encoder. The data displayed using [2] is stored in the memory and then proceeds to the next item. Pressing [3] proceeds to the next item without storing it in memory. Press [Side1] to display "SELF" and return to reset (default) status.

Function Setting Mode

No.

Function Choices Display Remarks

Function Key

[Side1] No Function

Talk Around Display Character Home Channel Channel Down

LAMP_OFF Default LAMP_3 LAMP_5 LAMP_7

LAMP_8 Channel Up LAMP_9 Keylock LAMP_10 Lamp LAMP_11 2-Tone Encode

LAMP_16

Default

Select Monitor A LAMP_17 Monitor B LAMP_18 Monitor C LAMP_19 Monitor D LAMP_20 RF Power Low

LAMP_21 Scan LAMP_22 Scan DEL/ADD Operator

LAMP_23

LAMP_27 Selectable Tone

2 [Side2] No Function MON_OFF

Talk Around MON_3 Display Character Home Channel Channel Down

MON_5

MON_7

MON_8 Channel Up MON_9 Keylock MON_10 Lamp MON_11 2-Tone Encode

MON_16 Select MONitor A MON_17

Default MONitor B MON_18 MONitor C MON_19 MONitor D MON_20

TK-372G

No.

Function Choices Display Remarks

2 [Side2]

[°]

[•]

5[2

RF Power Low Scan MON_22 Scan DEL/ADD Operator Selectable Tone No Function KEY1_OFF Talk Around KEY1_3 Display Character Home Channel Channel Down Channel Up KEY1_9 Keylock KEY1_10 Lamp KEY1_11 2-Tone Encode Select Monitor A KEY1_17 Monitor B KEY1_18 Monitor C KEY1_19 Monitor D KEY1_20 RF Power Low Scan KEY1_22 Scan DEL/ADD Operator Selectable Tone

No Function KEY2_OFF Talk Around KEY2_3 Display Character Home Channel Channel Down Channel Up KEY2_9 Keylock KEY2_10 Lamp KEY2_11 2-Tone Encode Select Monitor A KEY2_17 Monitor B KEY2_18 Monitor C KEY2_19 Monitor D KEY2_20 RF Power Low Scan KEY2_22 Scan DEL/ADD Operator Selectable Tone

]

No Function KEY3_OFF Talk Around KEY3_3 Display Character Home Channel Channel Down

MON_21

MON_23 MON_27

KEY1_5 KEY1_7 KEY1_8

KEY1_16

KEY1_21

KEY1_23 Default KEY1_27

KEY2_5 KEY2_7 KEY2_8

KEY2_16

KEY2_21

KEY2_23 KEY2_27

Default KEY3_5 KEY3_7 KEY3_8

REALIGNMENT

No.

Function Choices Display Remarks

5[2

]

[3]

7 [CH]

Power On Tone

Control Tone

Warning Tone

Time Out Timer

TOT Pre-Alert Time

TOT Rekey Time

TOT OFF1-15/ Reset Time

Clear to Transpond (BCL for Transpond)

Channel Up KEY3_9 Keylock KEY3_10 Lamp KEY3_11

2-Tone Encode Select Monitor A KEY3_17 Monitor B KEY3_18 Monitor C KEY3_19 Monitor D KEY3_20 RF Power Low Scan KEY3_22 Scan DEL/ADD Operator Selectable Tone No Function KEY4_OFF Talk Around KEY4_3 Display Character Home Channel Channel Down Channel Up KEY4_9 Keylock KEY4_10 Lamp KEY4_11 2-Tone Encode Select Monitor A KEY4_17 Monitor B KEY4_18 Monitor C KEY4_19 Monitor D KEY4_20 RF Power Low Scan KEY4_22 Scan DEL/ADD Operator Selectable Tone Channel Up/Down No Function

YES/NO YES/NO CNTT_YES Default:YES YES/NO OFF,15-300/15s Step OFF,1-10/ 1s Step OFF1-60/ 1s Step

1s Step YES CTT_YES NO CTT_NO Default

KEY3_16

KEY3_21 Default

KEY3_23 KEY3_27

KEY4_5 KEY4_7 KEY4_8

KEY4_16

KEY4_21

KEY4_23 KEY4_27

CH_UP/DN Default KNOB_OFF

Optional Feature

PONT_YES

WART_YES TOT_60 Default:60s TOTP_PFF

TOTK_OFF

TOTS_OFF

Default:YES

Cannot be set when TOT is OFF. Default:OFF Cannot be set when TOT is OFF. Default:OFF Cannot be set when TOT is OFF. Default:OFF

Default

REALIGNMENT

No.

Function Choices Display Remarks

Battery Save

17 Signaling OR SIG__OR Default

Squelch Level

19 Priority None PRI_NONE

Lock Back

Time A Lock Back

Time B

Revert Channel

Dropout

Delay Time

Dwell Time

Digit Time

Inter Digit Time

First Digit Time

First Digit Delay

Rise Time with QT

30 DIAL ID Enable DID_ENA *1

No.of DTMF Key

DTMF Hold Time

Store and Send

D Key Assignment

DTMF Signaling

Inter Mediaate Code

Group Code

38 Auto Rest OFF ART_OFF_

Time 1-15/1s ART__10 Default;10s

Call Alert/ Transpond

ON BATT_ON Default OFF BATT_OFF

AND SIG_AND 0-9/1 Step SQL__5 Default;5

Default Fixed PRI_FIX_ Selected PRI_SEL_

0.5-5.0/0.05 LBA_500 Default:500ms Cannot be

set when Priority = none.

0.5-5.0/0.05 LBB_2000 Default:2000ms Cannot

be set when Priority = none Selected REV_SEL Last Called REV_L/C_ Last Used REV_L/U_ Selected + Talk Back Priority REV_PRI_ Priority + Talk Back 0-300/1s DODT___3 Default;3s

0-300/1s DWL___3 Default;3s

50-200/10ms 50-200/10ms 50-200/10ms 100-1000/50ms 100-1000/50ms

Disable DID_DIS Default 12Key NODK_12 Default *1 16Key NODK_16 *1 ON DHT__ON Default *1 OFF DHT__OFF Enable SAS_ENA *1 Disable SAS_DIS Default D Code 1-16/1s DKA_16__ Code SQ SEL CALL 0-9,A-D,*,# IMC__#_

A-D,*,#

OFF CA/T_OFF Default Call Alert CA/T_C/A Transpond CA/T_T/A (Call Alert)

REV_S/T_

REV_P/T_

DTMF DIGT__50 Default;50ms IDT___50 Default;50ms FDT___50 Default;50ms RIST_100 Default;100ms RTWQ_100

DKA_D_CD Default

DTMS_CSQ Default DTMS_SEL

GPCD_FF_ Default;OFF

Default

Default;100ms

Default: # (Can be set only when

DTMF signaling = SEL CALL.)

TK-372G

No.

Function Choices Display Remarks

Transpond CA/T_T/I (ID Code) Transpond CA/T_T/T (Transpond Code)

Others

Panel Test/panel Tuning MODE

*1. This function is not available on TK-372G.

8-4. Memory Reset Mode

This mode is used to clear data for functions that can be set

in Self Programming Mode or to return to reset values (default).

Pressing [

"CANCEL".

Turning the encoder alternately switches the display

between "CANCEL" "READY".

Pressing [

sets the display to "CLEAR".

Pressing [ Pressing [

to "SELF" without resetting the data.

When the memory is reset, mode data and model data are not reset.

Enable PTM_ENA Default Disable PTM_DIS

] when "SELF" is shown, sets the display to

] when "READY" is shown, clears the data and

] again, returns the display to "SELF".

] when "CANCEL" is shown, returns the display

TK-372G

●

Flow Chart

REALIGNMENT

Function Setting Mode

Self programming mode

[Side1]

Function set mode

[Side1]

[Side1] key function

[Side1]

[MON] key function

[Side1]

[ ] key function

[Side1]

[ ] key function

[Side1]

[2]

key function

[Side1]

[3]

key function

[Side1]

[CH]

key function

[Side1]

Power on tone yes/no

[Side1]

Contorol tone yes/no

[Side1]

WArning tone yes/no

[Side1]

Time Out Timer

[Side1]

T.O.T. Pre-alert time

[Side1]

T.O.T. Rekey time

[Side1]

T.O.T. Reset time

[Side1]

Clear to Transpond

[Side1]

Battery Save on/off

[Side1]

Signaling

[Side1]

[2]/[3]

[Side1]

Look back time A

[Side1]

Look back time B

[Side1]

Dropout delay time

[Side1]

Rise time with QT

[Side1]

No. of DTMF key

[Side1]

DTMF hold time

[Side1]

D key assignment

[Side1]

Inter mediate code

Squelch level

[2]/[3]

Priority

[2]/[3]

Revert channel

[2]/[3]

Dwell time

[2]/[3]

Digit time

[2]/[3]

Inter digit time

[2]/[3]

First digit time

[2]/[3]

First digit delay

[2]/[3]

Dial ID

[2]/[3]

Store & Send

[2]/[3]

DTMF signaling

[2]/[3]

[Side1]

Group code

Auto reset time

Call alert/Transpond

Panel test/Panel tuning

mode

[2]/[3]

DISASSEMBLY FOR REPAIR

TK-372G

Separating the case assembly from the chassis.

1. Remove the two knobs z and three round units x.

2. Remove the two screws

3. Expand the right and left sides of the bottom of the case assembly, lift the chassis, and remove it from the case assembly

Separating the chassis from the unit.

1. Remove the three screws .. Lift the unit (X54), and rise up the connecter lever in the

arrow with your finger

Remove the three hexagonal bosses

twelve screws

2. Remove the solder from the antenna terminal using a

soldering iron, then lift the unit off (X57).

, and remove the

❾

X54-

❾

❿

X57-

Antenna teminal

4. Taking cure not to cut the speaker lead b, open the chassis and case assembly, and pull the speaker lead with connector n.

➐

❽

➐

❽

X57-

➐

❽

TK-372G

CIRCUIT DESCRIPTION

1. Frequency configuration

The receiver utilizes double conversion. The first IF is 49.95 MHz and the second IF is 450 kHz. The first local oscillator signal is supplied form the PLL circuit.

The PLL circuit in the transmitter generates the necessary frequencies. Fig. 1 shows the frequencies.

SYSTEM

50.4MHz

multiply

450kHz

PLL

VCO

AMP

TCXO

MIC

AMP

16.8MHz

MIC

TX/RX : 450~470MHz (K)

ANT

TX/RX : 403~430MHz (K4) TX/RX : 470~490MHz (K2) TX/RX : 490~512MHz (K3)

ANT

AMP

MCF

49.95MHz

RX : 400.05~420.05MHz (K) RX : 353.05~380.05MHz (K4) RX : 420.05~440.05MHz (K2) RX : 440.05~462.05MHz (K3)

TX/RX : 450~470MHz (K) TX/RX : 403~430MHz (K4) TX/RX : 470~490MHz (K2) TX/RX : 490~512MHz (K3)

Fig. 1 Frequency configuration

2. Receiver

The frequency configuration of the receiver is shown in Fig. 2.

ANT

RF AMP Q301

BPF

ANT

CF1 : Wide

CF2 : Narrow

IC4

IF, MIX, DET

X3 multiply

IC14

HPF LPF HPF BEF

2nd Local

Q12

Fig. 2 Receiver section

1) Front end (RF AMP)

The signal coming form the antenna passes through the transmit/receive switching diode circuit, (D3,D7) passes through a BPF, and is amplified by the RF amplifier (Q301). The resulting signal passes through a BPF and goes to the mixer.

BPF

AF AMP

IC16 (2/2)

TCXO

MIXER

Q19

1st Local

DE-

EMP

MCF

XF1

PLL

VCO

AF AMP

IC15(2/2)

EXP

IF AMP

Q22

AF VOL

MUTE

AF AMP

IC11

3) IF Amplifier circuit

The first IF signal is passed through a four-pole monolithic crystal filter (XF1) to remove the adjacent channel signal. The filtered first IF signal is amplified by the first IF amplifier (Q22) and then applied to the lF system IC (IC4). The IF system IC provides a second mixer, second local oscillator, limiting amplifier, quadrature detector and RSSI (Received Signal Strength Indicator). The second mixer mixes the first IF signal with the 50.4MHz of the second local oscillator output (TCXO X3) and produces the second IF signal of 450kHz. The second IF signal is passed through the ceramic filter (CF1; Wide, CF2 ; Narrow) to remove the adjacent channel signal. The filtered second IF signal is amplified by the limiting amplifier and demodulated by the quadrature detector with the ceramic discriminator (CD1). The demodulated signal is routed to the audio circuit.

4) Wide/Narrow changeover circuit

Narrow and Wide settings can be made for each channel by switching the ceramic filters CF1 (Wide) and CF2 (Narrow). The WIDE (high level) and NARROW (low level) data is output from IC5 (OUTPUT EXPANDER), pin 4. When a WIDE (high level) data is received, Q14 turn off and Q17 turn on. When a NARROW (low level) data is received, Q14 turn on and Q17 turn off. D14 and D13 are switched to ceramic filters when a high/low level data is received. Q23 turns on/off with the Wide/Narrow data and the IC4 detector output level is changed to maintain a constant

output level during wide or narrow signals.

CD1

R108

C133

AFO

IFO

Q14

MXO

QAD

IFI

C108

R105

Q22

R75

R98

MXI

CF1

Q23

IC4 FM IF SYSTEM

W/N

R74

W/N

"H" : Wide "L" : Narrow

C107

2) First mixer

The signal from the front end is mixed with the first local oscillator signal generated in the PLL circuit by Q19 to produce a first IF frequency of 49.95 MHz. The resulting signal passes through the XF1 MCF to cut the adjacent spurious and provide the optimum characteristics, such as adjacent frequency selectivity.

R80

D13

R79

C263

Q17

C265

R78

D14

CF2

R81

Fig. 3 Wide/Narrow changeover circuit

+ 36 hidden pages