Kenwood TK-388G Service Manual

UHF FM TRANSCEIVER / UHF FM
TK-388G
SERVICE MANUAL /
M6 VERSION	© 2002-10 PRINTED IN JAPAN
	B51-8635-00 (S) 607

Helical antenna (T90-0735-05)

Button knob

(PTT)

(K29-5334-23)

Button knob

(MONI/LAMP) (K29-5333-13)

Knob

(ENCODER)

(K29-5331-03)

Knob (VOLUME)

(K29-5332-03)

Cabinet assy

(A02-2385-53)

Key top (DTMF) (K29-5459-12)

CONTENTS
GENERAL .............................................................		2
SYSTEM SET-UP .................................................		3
OPERATING FEATURES .....................................		4
REALIGNMENT ..................................................		13
DISASSEMBLY FOR REPAIR ............................		28
CIRCUIT DESCRIPTION .....................................		29
SEMICONDUCTOR DATA .................................		37
COMPONENTS DESCRIPTION .........................		40
PARTS LIST ........................................................		42
EXPLODED VIEW...............................................		48
PACKING ............................................................		49
ADJUSTMENT ...................................................		50
PC BOARD
DISPLAY UNIT (X54-3250-10) ......................		65
TX-RX UNIT (X57-6500-21) ..........................		67
SCHEMATIC DIAGRAM.....................................		73
BLOCK DIAGRAM ..............................................		77
LEVEL DIAGRAM ...............................................		79
KNB-14/KNB-15A (Ni-Cd BATTERY) ................		80
KMC-17/KMC-21 (SPEAKER MICROPHONE) ..		81
SPECIFICATIONS ............................	BACK COVER

TK-388G

...............................................................................................	2	.............................................................................................	50
......................................................................................	3	PC
......................................................................................	4	(X54-3250-10) ....................................................	65
....................................................................................	13	TX-RX (X57-6500-21) ...............................................	67
.......................................................................	28	........................................................................................	73
....................................................................................	29	........................................................................................	77
................................................................................	37	........................................................................................	79
....................................................................................	40	KNB-14/KNB-15A ( ) ............................................	80
........................................................................................	42	KMC-17/KMC-21 ( ) ..............................................	81
................................................................................	48	.............................................................................................	83
.............................................................................................	49

GENERAL /

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.

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.

2

TK-388G

SYSTEM SET-UP /

SERVICE

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

Note:

You must use KPG-56D version 3.30 or later for this transceiver. KPG-56D versions 3.20 or earlier do not work properly.

KPG-56D 3.30 KPG56D 3.20

	Model &			Unit		Frequency range	Remarks	HELICAL Antenna	Charger	Battery	16 Key
	destination			TX-RX Unit	Display Unit
	TK-388G		M6	X57-6500-21	X54-3250-10	350~370MHz	IF1 : 49.95MHz		Option	Option
							LOC : 50.4MHz
											16
				TX-RX
	TK-388G		M6	X57-6500-21	X54-3250-10	350~370MHz	IF1 : 49.95MHz
							LOC : 50.4MHz

SYSTEM SET-UP /

Merchandise received

Choose the type of transceiver

Transceiver programming

Frequency range (MHz)		RF power	Type
MHz
TX/RX	350~370	4.0W	TK-388G M6

A personal computer (IBM PC or compatible), programming

interface (KPG-22), and programming software (KPG-56D ver 3.30 or later) are required for programming.

(The frequency, TX power HI/LOW, and signalling data are programmed for the transceiver.)

IBM KPG-22

KPG-56D 3.30 /

			YES		KMC-17 or KMC-21
Are you using the speaker microphone?					Speaker microphone
					KMC-17 KMC-21
		NO
						(Option)
Delivery

3

TK-388G

OPERATING FEATURES /

1. Operation Features		1.
	Antenna
		qwe
	Speaker	Microphone

r

t

y u

i

o

!0

1 2 3 A

4 5 6 B

7 8 9 C

0 D

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

qRotary encoder

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

wLED indicator

Lights red while transmitting. Lights green while receiving. Flashes orange while receiving a Code Squelch or a 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.

ePower switch/ Volume control

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

rPTT (Push-to-Talk) switch

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

tSide 1 key

This is a PF (Programmable Function) key. Press it to activate its auxiliary function (page 5).

ySide 2 key

This is a PF (Programmable Function) key. Press it to activate its auxiliary function (page 5).

u °, •, 2,3 keys

These are PF (Programmable Function) keys. Press each key to activate its auxiliary function.

iDTMF keypad

Used for storing and transmitting DTMF numbers.

oSP/MIC jacks

Connect an optional speaker/ microphone here.

!0Display

4 (See page 7.)

KNB-14

//

DTMF

e /

rPTT

t

PF5

PF

5

u ° • 2 3

PF

iDTMF

DTMF

o/

/

!0

7

TK-388G

OPERATING FEATURES /

Note: The PF keys are programmed with default functions:

•Side 1 key: Lamp

•Side 2 key: Monitor A

•	key:	Scan
•	°•key:	Scan Del/Add
• 2 key:		Talk Around
• 3 key:		RF Power Lo

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

•Redial

•RF Power Lo

•Scan

•Scan Del/Add

•Selectable QT

•Talk Around

•2-Tone Encode Select

•Trunking Group Code Select *1

*1 Available only when using Trunking function.

•A

•
•	•
	°	/
•	2
•	3

° • 2 3

•A -

•B -

•C -

•D -

•/

•QT

•SmarTrunkII® *1*1

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.

This key functions as the voice scrambler code selector in the voice scrambler code select mode.

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.

2

FPU

1 /

1/

2

LCD / /

3 /

1/

5

TK-388G

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)Selectable QT (SEL QT)

When the SEL QT switch is pressed, QT frequency can be temporarily changed with the Rotary encoder.

9)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.

10)2-Tone Encode Select

1Press the key programmed as 2-tone Encode Select. •A pre-programmed 2-tone code name appears on the

display.

2Press the key programmed as Rotary encoder to select you desired 2-tone code name.

3Press PTT switch and 2-Tone Encode Select key to transmit and release them to receive.

Note:

You cannot change the tone in step 2 by using the Rotary encoder keys.

11) Redial

Pressing this key when Group/Channel is shown, displays the previously transmitted DTMF code. Pressing [PTT] at this time, transmits the code that is currently displayed.

12) 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.

4

5

1 [PTT] [ 1] [ 2] [ ] [ ]

FPU 12/16 DTMFDTMF [PF]

6

LCD

5 5

7

8 QT SEL QT

SEL QT QT

9

10

•

2 名称

3PTT

2

11

/ DTMF[PTT]

12

高→ →

6

TK-388G

OPERATING FEATURES /

13) Scan

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

14) Scan Del/Add

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

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.

15) None

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

13

14 /

“ ” “ ” “ ” “ ”

15

beep

3. Display /

Icon	Description

Appears while using trunking.

Appears when the selected channel is busy.

Appears when QT, DQT, DTMF, or 2- Tone decoding is deactivated (by pressing the Monitor key).

Appears when you receive a Code Squelch, Selective Call, 2-Tone, or DTMF Signalling 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.

QT DQT DTMF

DTMF

现

DTMF

7

TK-388G

OPERATING FEATURES /

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.

●Multiple Group Scan

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

groups.

2) Scan Start Condition

4.

1

2

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 ver 3.30 or later).

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 ver 3.30 or later).

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 nosignal 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.

PTT “SCN”

3

1KPG-56D 3.30

2

4

2“A”

5

KPG-56D 3.30

1

6

2 止

8

TK-388G

OPERATING FEATURES /

7) Revert Channel

The revert channel is used to transmit during scanning and set by the programming software (KPG-56D ver 3.30 or later).

1Priority

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.

3Selected channel

The transceiver reverts to the channel before scanning or

the channel that you changed during scan.

4Last called channel

The transceiver reverts to the last called channel during

scan.

5Last used channel

The transceiver reverts to the last used (transmitted)

channel during scan. "Last used" revert channel includes talkback function.

6Selected 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.

7

KPG56D 3.30

PTT

道。

3 道。

5“”

6 道。

8

“SCN” “SCAN”

9 /

/

删除/

/

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.

5.

1

15 300 PTTPTT

9

TK-388G

OPERATING FEATURES /

2)Selective Call Alert LED

You can select whether or not the LED on the transceiver

flashes orange when selective call has occurred.

3)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. 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.

4)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.

5)"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.

6)"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.

7)"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.

2

灯

3 PTT ID

PTT PTT ID DTMF ANI IDID

PTT ID

Off BOT ID EOT PTT ID BOTH

ID

ID DTMF

ID

ID BOT ID

ID EOT ID

IDID

“PTT ID ”

4

“ ”

“ ” beep

beep “”

5“TOT”

“TOT” “TOT”“TOT”

TOT “TOT”

6“TOT”

“TOT” “TOT”“TOT”

7“TOT”

“TOT” “TOT”

“TOT” PTT “TOT” “TOT”

10

TK-388G

OPERATING FEATURES /

8) Clear to Transpond	8
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	9
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 Signalling.

When Option Signalling matches on a Group Channel where it is set to Yes, the Option Signalling display flashes and Option Signalling 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 signalling matches (when Option Signal is deactivated by a transmission).

AND/OR

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

	Alert/Transpond	AF Mute Open
AND	Triggers at match with QT/	Triggers at match with QT/
	DQT/ID+DTMF(2tone);Opt	DQT/ID+DTMF(2tone);Opt
OR	Triggers at match with QT/DQT	Triggers only for match with
	/ID or DTMF(2tone) ; Opt	QT/DQT/ID;Signalling

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

Even if set as OR, AF mute cannot be canceled just by a match with DTMF.

In conventional channels not set with QT/DQT, signalling is a match just by receiving the carrier.

Auto Reset

When Option Signalling matches on a Group channel where it is set to Yes, Option Signalling is canceled when it matches a group channel set to Yes.

After Option Signalling matches, Option Signalling can automatically Reset after a specified time.

6. DTMF/

DTMF

DBD DBDDTMF

“ ” “ ”

ID/ QT/DQT

/

/

	/
	QT/DQT/ID+DTMF	QT/DQT/ID+DTMF
	(2tone) ;	(2tone) ;
	QT/DQT/ID DTMF	QT/DQT/ID
	(2tone) ;	;

OR DTMF /OR DTMF

QT/DQT

11

TK-388G

OPERATING FEATURES /

Dead Beat Disable
When the D.B.D (Dead Beat Disable) code matches, a	D.B.D
preset operation is performed.	/ D.B.D
When D.B.D matches on all group channels regardless of	/
whether Option Signalling = Yes/No, then TX Inhibit or	D.B.D “ ” D.B.D
TX/RX Inhibit is activated by the settings performed
afterwards. D.B.D is canceled when the D.B.D. code + "#" is
received.
Transpond is always activated when the D.B.D code is a	D.B.D
matches. Alert is not output. An Option Signalling match is
not displayed.

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 lockout.

•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

7.

1477Hz 941Hz 770Hz

500ms

TOT PTT697Hz

DTMF/

7

		770Hz			770Hz
		30ms		30ms	30ms
•
		DTMF/
		2000Hz			2000Hz		2000Hz
		100ms		100ms	100ms	100ms	100ms
•

TOT TOT TOT

1633Hz		1633Hz		1633Hz
50ms	50ms	50ms	50ms	50ms

12

TK-388G

REALIGNMENT /

REALIGNMENT

1. Modes

		User mode
		Panel test mode
						Panel tuning mode
		PC mode				Data programming
						mode
		Firmware
		programming mode
						PC test mode			PC tuning mode
		Clone mode				Checksum
		Self programming
		mode
		Mode				Function
	User mode			For normal use.
	Panel test mode			Used by the dealer to check the
				fundamental characteristics.
	Panel tuning mode			Used by the dealer to tune the radio.
	PC mode			Used for communication between
				the radio and PC (IBM compatible).
	Data programming			Used to read and write frequency data
	mode			and other features to and from the radio.
	PC test mode			Used to check the radio using the PC.
				This feature is included in the FPU.
				See panel test.
	PC tuning mode			Used to tune the radio using the PC.
				This feature is included in the FPU.
				See panel tuning.
	Firmware program-			Used when changing the main
	ming mode			program of the flash memory.
	Clone mode			Used to transfer programming data
				from one radio to another.
	Self programming			Frequency, signalling and features.
	mode

1.

					IBM
					FPU
					FPU
					Flash Rom

2. How to Enter Each Mode

Mode	Operation
User mode	Power ON
Panel test mode	[2]+Power ON (Two seconds)
PC mode	Received commands from PC
Panel tuning mode	[Panel test mode]+[ ]
Firmware programming mode	[Side1]+[Side2]+Power° ON
	(Two seconds)
Clone mode	[Side1]+[3]+Power ON
	(Two seconds)
Self programming mode	[Side1]+[•]+Power ON
	(Two seconds)

3. Panel Test Mode

Setting method, refer to ADJUSTMENT.

4. Panel Tuning Mode

Setting method, refer to ADJUSTMENT.

2.

	[2] 2
	[ ] [ ]
	[ 1 ] [ °2 ]
	2
	[ 1] [3] 2
	[ 1] [•] 2
3.
4.

13