Kenwood TK-481, TK-480 Service Manual

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800MHz/900MHz FM TRANSCEIVER

TK-480/48 1

SERVICE MANUAL

REVISED II

This service manual applies to products with 30100001 or subsequent serial numbers.

Whip antenna (T90-0636-25) : TK-480 (T90-0640-25) : TK-481

Knob (ENC) (K29-5232-03)

Knob (VOL) (K29-5231-03)

Panel assy (A62-0981-04)

Badge (B43-1139-04)

Knob (PTT) (K29-5157-03)

Cabinet assy (A02-3659-03) : K2

Packing (G53-0841-02) : K2

CONTENTS

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

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

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

REALIGNMENT................................................. 11

CIRCUIT DESCRIPTION.................................... 14

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

DESCRIPTION OF COMPONENTS .................. 23

PARTS LIST ....................................................... 24

EXPLODED VIEW ............................................. 30

PACKING ........................................................... 31

ADJUSTMENT .................................................. 32

TERMINAL FUNCTION .................................... 40

PC BOARD VIEWS

DISPLAY UNIT (X54-3210-XX) .................... 41

TX-RX UNIT (X57-5630-XX) ......................... 47

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

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

LEVEL DIAGRAM (TK-480) .............................. 59

LEVEL DIAGRAM (TK-481) .............................. 60

KNB-16A/17A (Ni-Cd BATTERY) ..................... 61

KPG-36 (PROGRAMMING INTERFACE CABLE)

KSC-19 (CHARGER) .......................................... 61

SPECIFICATIONS.............................................. 62

.... 61

Photo is TK-480/481 K2 type. (Produced in Singapore)

CAUTION When using an external power connector, please use with maximum final module protection of 9V.

TK-480/481

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 this publication date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions, which 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, and 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 secure and

any open connectors are properly terminated.

• SHUT OFF this equipment when near electrical blasting caps or while in an explosive atmosphere.

• This equipment should be serviced by only qualified technicians.

SERVICE

This radio is designed for easy servicing. Refer to the

schematic diagrams, printed circuit board views, and alignment procedures contained within.

NOTE

WE CANNOT guarantee oscillator stability when using

channel elements manufactured by companies other than KENWOOD or its authorized agents.

You must use the KPG-49D to program TK-480/481 trans-

ceivers with a serial number of 30100001 or greater. You cannot use the KPG-35D for those radios.

TK-480/481 transceivers with a serial number of

30100001 or greater have a red triangle in the KENWOOD logo label (B43-1139-04) on the front panel. You will also find the model name plate marked as “Ver 2.0” on the rear of the transceiver.

Unit TX-RX unit Display unit

Model &

destination 0-10 0-11 0-10 0-11

TK-480

TK-481

Note X57-5630-XX/X54-3210-XX : Produced in Singapore

X57-5630-XX X54-3210-XX

K ✓✓ K2 ✓✓ LOC : 44.395MHz ✓ K ✓✓ K2 ✓✓ LOC : 44.395MHz ✓

Frequency range Remarks QT/DQT DTMF Charger Battery 16 key

806~870MHz

896~941MHz

SYSTEM SET-UP

Merchandise received

License and frequency allocated by FCC

Choose the type of transceiver

Transceiver programming

IF1 : 44.85MHz

Frequency range (MHz) RF power Type

TX 806~825 2.5W TK-480 K,K2

851~870 RX 851~870 TX 896~902 TK-481 K,K2

935~941

RX 935~941

A personal computer (IBM PC or compatible), programming interface (KPG-36), and programming software (KPG-49D) are required for programming. (The frequency, trunked system features, conventional system features, TX power HI/LOW, and signaling data are programmed for the transceiver.)

✓✓Option ✓

–

Are you using the speaker microphone?

Delivery

YES

KMC-25

Speaker microphone

(Option)

OPERATING FEATURES

TK-480/481

1. Operation Features

The TK-480/481 is an 800/900MHz band EFJ LTR™-compatible trunked radio designed to operate in both trunked and conventional modes. The programmable features are summarized.

Model Trunking mode

Conventional mode

This model can handle up to 32 systems with up to 250 groups in each system. The transceiver can be used in both trunked mode and conventional mode. Systems, groups, and their functions are programmed.

2. Transceiver Controls and Indicators

2-1. Physical Layout

Microphone Speaker

1 2 3

Volume/Power switch

Transceiver Power and Volume switch. Turn clockwise to switch On the transceiver. Turn counterclockwise fully to switch OFF the transceiver. Also adjusts the volume level. When the power is switched off, all the parameters, such as the system and group, are stored in memory. When the power is switched on again, the system returns to the previous conditions.

Auxiliary (orange) key (Programmable)

Battery pack release catch

Push down to release the battery pack. See Installing the Ni-Cd Battery Pack.

MONITOR key* (Programmable)

PTT (Push-To-Talk) key

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

LAMP key* (Programmable)

TX/BATT indicator

This red LED lights during transmission (it does not light during busy or when transmit is prohibited). If the battery voltage falls below the programmed voltage during transmission, the brightness of this indicator decreases at intervals of about one second, so it can be used as the battery voltage alert function.

S, A, B, and C key (Programmable)

Note : The transceiver is also available without the DTMF

keypad (

2-2. Panel controls

The key on the top and front panel is momentary-type push buttons. The functions of these keys and knob are explained below.

Antenna connector

Connect the supplied antenna here.

System or Group selector knob (Programmable)

Turning the system (or group) selector knob clockwise

increases the system (or group) number by one. Turning

the knob in the counterclockwise direction decreases the

system (or group) number by one.

After the system number (or group number) reaches the

highest system number (or group number), it goes back

to lowest system number (or group number).

System numbers (or group numbers) not set are skipped.

Caution : The FPU (KPG-49D) allows selecting between

system selector and group selector.

DTMF keypad (keypad model only)

Press the keys on the telephone keypad to send DTMF tones.

Universal connector

Connect the external KMC-25 speaker/ microphone (optional) here. Otherwise, keep the supplied cover in place.

* : MONITOR and LAMP are arbitrary names chosen for these buttons. They can be used for any of the auxiliary functions.

2-3. Programmable keys

The FPU (KPG-49D) enables programmable keys to se-

lect the following functions.

Auto Tel, AUX(only when Voice Scrambler is not selected), DTMF ID (BOT), DTMF ID (EOT), Display Character, Emergency (only AUX key), Function, Group Down, Group Up, Home Group, Key Lock, Lamp, Memory (RCL/STO), Memory (RCL), Memory (STO), Monitor A, Monitor B, Monitor C, Monitor D, Redial, RF Power Lo, Scan, Scan Del/Add, Scan Temporary Delete, Scrambler (Only when Voice Scrambler is selected), SP Attenuation (Only MIC switch), System Down, System Up, TEL Disconnect and none.

These functions the FPU programs to the function keys are described in the following sections.

TK-480/481

OPERATING FEATURES

■ Auto TEL

Automatically connects available repeaters that are connected to telephone circuits when operating as LTR system. The time allocated to search for available repeaters is 60 seconds, after which connection failure occurs, a DTMF tone is output and the function terminates.

If connection to an available circuit is made, only ID 253, EOT or hang-up time-out can terminate the function.

■ AUX

This function can be programmed when the voice scrambler board is not installed.

If this key is pressed, an underscore (“_”) appears at the extreme right of the LCD and AUX port which is inside of the transceiver turns to the active level. If pressed again, the underscore disappears and the AUX ports turns to the deactive level.

■ DTMF ID (BOT)

Pressing this key in Conventional mode, automatically sends the preset Connect ID.

■ DTMF ID (EOT)

Pressing this key in Conventional mode, automatically sends the preset Disconnect ID.

■ Display character

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

■ Emergency

Pressing this key for longer than the programmed “Emergency Key Delay Time” causes the transceiver to enter the emergency mode. The transceiver jumps to the programmed “Emergency System/Group” and transmits for the programmed “Active Time”.

The transceiver disables mic mute while transmitting. After finishing transmission, the transceiver receivers for the programmed “Interval Time”. The transceiver mutes the speaker while receiving. Following the above sequence, the transceiver continues to transmit and receive.

If “Man Down Switch” has been programmed on the radio and the switch is activated, the radio enters Emergency mode after the specified “Man Down Delay Time” expires.

■ Key lock

Pressing this key causes the transceiver to accept entry of only the [Function], [Key Lock], [PTT], [Lamp], [Monitor A], [Monitor B], [Monitor C], [Monitor D], and [Emergency] keys.

The locked keys also include the tuning control.

■ 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.

■ Memory

This key allows DTMF memory data to be recalled; up to 32 memories each with a memory dial of up to 16 digits and an A/N of up to 10 digits per memory.

■ Monitor

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

■ Redial

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

■ 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.

■ Scan

Press this key starts scanning. Pressing this key stops scanning.

■ Scan Del/Add

Used to select whether system scan routines are used during system scan. Each pressing of the key (to ON) toggles between lockout and lock. The scan routine is started when on lock. The DEL indicator flashes when the system is on lockout.

■ Function

Pressing this key causes the transceiver to display “FCN”. Then, pressing a DTMF key causes the corresponding programmed function to start. This key may be convenient when using many functions with the 12-key keypad (K2 type).

■ 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.

■ Home group

Each pressing of the key selects a preset system/group.

■ Scan temporary delete

This key is temporarily deleted a system being scanned. If you press this key when scan is stopped (when a call is being received from another station), the system is temporarily deleted and scanning restarts.

This key operates even when “Scan Type” is set to “List Type System Scan”.

■ Scrambler

If a scrambler code (1 to 4) has been set in the FPU, an underscore (“_”) appears at the extreme right of the LCD display when scrambler is active. Pressing this key changes ON/OFF of scramble operation.

Holding this key down for 2 seconds sets Scramble Code Select Mode.

OPERATING FEATURES

TK-480/481

■ System up/down

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

■ Telephone disconnect

Pressing this key ends an RIC connection (disconnects the telephone line).

■ None

Sounds error operation beep, and no action will occur.

Use this function when the transceiver is required to be more simple operated.

2-4. Display

Sub display

Displays the system, channel and group numbers. Also

displays various functions, such as TA.

Alphanumeric display

The twelve-character dot matrix alphanumeric display shows the system and group numbers. You can program system and group names with up to ten characters in place of these numbers. The left display is used as a delete indicator ( call (

) or scrambler ( _ ) function. The delete/add indicator shows the systems locked out of the scanning sequence. Selective call and scrambler are optional functions that can be programmed.

) and the right is used for the selective

3. Scan Operating

3-1. System scan

System scan can be selected with the “Scan” key by pro-

gramming the scan feature. When the “Scan” key is pressed and the “SCN”’ mark appears, scan mode in entered. Scanning starts from the system following the currently displayed system. When a call is received, scanning stops, and the system and group are displayed.

When the system knob or programming key is touched

during scanning, the scan stops and the revert system or group can be changed. Scanning resumes one second after the key is released.

System scan consists of the following 2 types.

■ Fix system scan

All the set systems except locked-out ones are scanned.

If the DEL/ADD feature is assigned to the programmable key, it can be controlled from the front panel.

P (Priority) indicator

The P indicator ( ) appears when a selected channel is programmed as priority, in conventional operation.

MON (Monitor) indicator

The MON indicator appears when the button programmed as MONITOR is pressed.

SVC (Service) indicator

This icon is not used on this transceiver.

SCN (Scan) indicator

The SCN indicator appears when using Scan mode.

LO indicator

Appears when low power is selected.

Handset indicator

The handset indicator ( ) appears when the selected group is programmed as telephone IDs.

MAIL indicator

Flashes when a status message (FleetSync™) is received. Lights when a status message is stored in the stack memory.

■ List type system scan

A scan list can be set for each system. The list to be scanned can be changed by changing the

display system.

If many system have been set, the scan speed can be

increased by narrowing the systems to be scanned with scan lists.

3-2. System lockout

The system lockout feature is used to lock systems out

of the scan sequence, and can be selected by programming in the following two ways:

■ Fixed lockout

The system to be locked out is selected by programming.

When a locked system is selected, the Delete ( appears on the left of the SYSTEM indicator. The revert system is scanned even if it is locked out. If there is a locked system, the Delete ( ning.

) indicator flashes during fixed scan-

) indicator

■ User selectable lockout

If the scan lockout feature is programmed to a key, the

user can lock systems out of the scan sequence with the key. To lock a system out of the scan sequence, press the key when the system is displayed. The Delete ( is displayed on the left of the SYSTEM indicator.

) indicator

TK-480/481

OPERATING FEATURES

To unlock a system, select the system and press the key. The Delete ( tem has returned to the scan sequence. The revert system is scanned even if it is locked out. If there a locked system, the Delete ( systems are locked out, the scan stops and only the revert system is received.

) indicator disappears to indicate that the sys-

) indicator flashes during fixed scanning. If all

3-3. Drop-out delay time (Scan resume time)

If a call is received during scan, the scan stops. The scan resume time can be programmed as 0 to 300 seconds in one-second increments. The default value is 3 seconds.

3-4. Dwell time

The dwell time is the time after transmission ends until the scan resumes in scan mode. It can be set 0 to 300 seconds by programming. The default value is 3 seconds.

3-5. System/Group revert

System/Group revert can be programmed for one of the following;

■ Last called revert

The system or group changes to the revert system or group when a call is received with the system or group being scanned.

■ Last used revert

If a system/group call is received during scanning and the PTT button is pressed for transmission and response within the drop out delay time, the system or group is assigned as the new revert system or group.

■ Selected revert

If the system/group was changed while scanning, the newly selected system/group.

■ Selected + Talkback

If the system/group was changed while scanning, the newly selected system/group. The transceiver “talks back” on the current receive group.

3-6. Scan message wait

The time for staying with the home repeater that receives a signal during system scan and monitoring data messages can be programmed. If there is no signal from the home repeater, the system is scanned for about 50ms. If there is a signal, three data messages are monitored. Normally, three data messages are monitored for each system, and it can be increased in multiples of three data messages per line to up to eight lines.

If the repeater data message indicates that there is no call, data monitoring is terminated and the home repeater of the next system is scanned.

3-7. Group scan operation

Group scan can be programmed for each group. In addition to the ID codes of the selected group, the ID codes of the other groups that are permitted for group scan are decoded. (The two fixed ID and block decode codes are always decoded.)

If, during group scanning, a call is received with one of the selectable group ID codes for which group scan is enabled, the group display indicates the group number that the call came in with. That group then becomes the new selected group. Group scan resumes after the specified dropout delay time or dwell time shared by the system scan elapses.

3-8. In Conventional system.

If QT or DQT is set for the channel, the channels, including signalling, are scanned.

In case of the priority group is set in conventional system, if a group scan (including group scan during a system scan) temporarily stops (receiving) in a group that does not have priority, a look back is performed to the priority group. Look back is performed according to the look back time A and B settings. If a call is received on the priority group, reception immediately switches to the priority group.

4. Details of Features

4-1. Time-out timer

The time-out timer can be programmed in 15 seconds increments from 15 seconds to ten minutes. 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.

4-2. Sub LCD

You can use 3-digit the display to display the system number, channel number or group number. It is useful when the main (12-digit) display indicates system, group or channel name or other functions.

4-3. Selective Call Alert LED

You can select whether or not the LED on the transceiver flashes in an orange color when selective call was occurred.

4-4. PTT ID

PTT ID provides a DTMF ANI or MSK ID to be sent with every time PTT (connect ID at beginning of transmission, disconnect ID at end of transmission, or both).

You can program PTT ID “on” or “off” for each group channel (DTMF). The contents of ID are programmed for each transceiver.

The transceiver is capable to have ID. The format is DTMF. The timing that the transceiver sends ID is programmable.

BOT : Connect ID is sent on beginning of transmission.

EOT : Disconnect ID is sent on end of transmission.

Both : Connect ID is sent on beginning of transmission and disconnect ID is sent on end of transmission.

There is also “PTT ID” setting for each channel.

OPERATING FEATURES

TK-480/481

4-5. Radio password

When the password is set in the transceiver, user can not

use the transceiver unless enter the correct password.

This code can be up to 6 digits from 0 to 9 and input with

the keypad or selector, and “S” key.

4-6. Battery Warning

This transceiver has battery warning feature. If the low voltage is detected during transmission, the transceiver warns it by flashing red “LED”.

Then more low voltage is detected during transmission, the transceiver stops transmission and warns it by flashing red “LED” and beep.

Please notice “standard” for the battery exchange, charging time by flashing red LED and beep.

4-7. Minimum Volume

The minimum volume is programmable (off (0) to 31). The transceiver remains the minimum volume level however the mechanical volume position is set to zero.

4-8. Call indicator

The call indicator can be programmed for each group. In trunked system, it can be set to respond to a selectable decode ID or one of two fixed IDs, except block IDs. When a call is received with a selectable decode ID, the call indicator flashes. When a call is received with a fixed ID, the call indicator lights continuously.

On a conventional system, the call indicator can be programmed to light for each QT or DQT code. It keeps flashing while a call is being received. It is turned off by pressing any front panel key.

4-9. Free system ringback

This feature is available only when a telephone interconnected ID code is selected. If a busy tone sounds when the PTT button is pressed, the transceiver enters this mode automatically.

When the PTT button is released, a beep sounds for 400ms to indicate that the mode has been entered. If the scan is on, it is resumed (the “SCN” mark goes on). When any repeater becomes available, a ringing tone sounds and this mode ends.

The mode is terminated when the system, group, scan, PTT, key is changed.

4-10. System search

This feature can be programmed to automatically access other programmed systems when the selected system cannot be accessed. If an intercept tone sounds when the PTT button is pressed after setting the mode, the transceiver has entered the mode.

If the group ID is a telephone interconnect ID, the transceiver then attempts to access, in succession, other systems that have a telephone interconnect ID in the revert group location. If the group ID is a dispatch ID, the transceiver attempts to access other systems that have a dispatch ID programmed in the revert group location.

If there is no system to be accessed, an intercept tone sounds, the mode is terminated, and the transceiver returns to the first system. If the access is successful, the mode is terminated, and the searched system becomes the new selected system (If during scanning, the scan stops).

4-11. Transpond

This feature can be programmed to turn on and off for each group. If the ID of the group for which transpond is enabled is received, two data messages (transmit ID and turn-off code) are automatically transmitted if the PTT button is not pressed as a response within the time set (0 to 300 seconds in 1-second increments). If the PTT button is pressed within the time, the transpond is not preformed.

4-12. Transmit inhibit

The transceiver can be programmed with a transmit inhibit block of ID codes. If an ID code within this block is decoded the preset time before the PTT button is pressed, transmission is inhibited. The BUSY indicator lights and a busy tone sounds until the PTT button is released to indicate that transmission is not possible (except clear-to talk mode).

Transmission with the group for which the encode ID is not set is inhibited, and the busy tone is output while the PTT button is held down, regardless of the clear-to -talk setting.

4-13. Auto TEL

A telephone interconnect call can be made by simply pressing the key by assigning this feature to the key. This feature accesses the TEL channel of the available system automatically.

When the key is pressed, a queue tone is output, and the “AUTO TEL” appears on the alphanumeric display along with a flashing handset indicator ( mode has been entered. If the TEL ID is set for the revert system, the TEL channel of that system is accessed. If all TEL channels are busy, an attempt is made to access the TEL channels of another system in which the TEL ID code has been programmed. It is repeated for 60 seconds until the access succeeds. If the access succeeds, a dial tone returns from the repeater. If the key is pressed again when the queue tone is sounding, this mode is canceled.

If the access fails after 60 seconds, a deny tone is output and this mode is terminated. When the talk ends, the revert system/group returns. When the scan mode is effective, the scan resumes. The Auto TEL feature can be programmed to turn on or off for each system.

) to indicate that this

■ ARQ mode

If affects Trunking mode only. Automatic Repeat Request (ARQ) mode is a manner to minimize the air traffic of data communication. Also, it enables to occupy the trunking repeater channel for the data communication period.

■ Data TX with QT/DQT

Whether programmed QT/DQT is modulated or not with a data transmission except for Selcall. A radio unit can receive a data message regardless of QT/DQT if the receiving unit is not scanning.

TK-480/481

OPERATING FEATURES

5. Option Signalling

5-1. DTMF

Built-in DTMF decoder is available for option signalling. It is possible to use individual call, group call, D.B.D.

(Dead Beat Disable). D.B.D. is used with DTMF only.

If the option signalling matches, a predetermined action

will occur.

If option signalling matches on a group which is set up with option signalling, the option signalling indicator ( flash and option signalling will be released. The transpond or alert tone will sound.

If the selective call alert LED is set up, the orange LED will flash.

While option signalling matches (or if option signalling is deactivated when you are transmitting), you can mute or unmute ID/QT/DQT/Carrier.

■ AND/OR

You can select AND or OR for option signalling match conditions.

Alert/Transpond

AND QT/DQT/ID+DTMF; Option matches = Action

OR QT/DQT/ID+DTMF; Option matches = Action

AF mute open

AND QT/DQT/ID+DTMF; Option matches = Action

OR QT/DQT/ID; Signalling only matches = Action

) will

■ AND/OR

AND : QT/DQT/ID + MSK to unmute. MSK matches =

alert tone

OR : QT/DQT/ID to unmute. MSK matches = alert tone

Alphanumeric Two-way Paging Function

(FleetSync™)

6-1. General

The Alphanumeric Two-way Paging Function (FleetSync™) is a Kenwood proprietary protocol. It enables a variety of paging functions.

6-2. ID Construction

A radio unit ID is defined by a combination of 3-digit Fleet and 4-digit ID numbers. Each radio unit must be assigned its own Fleet and ID numbers.

6-3. PTT ID

A pre-programmed unique ID (Own) can be sent at the beginning of transmission and/or the end of transmission to identify which radio unit is on air.

When selecting (Sel) for MSK ID, the radio calls the specific Fleet user the same as selective call.

6-4. Selective Call (SELCALL)

This is a voice call to a particular individual or group of stations.

With OR set up, alert/transpond will not function with

only DTMF.

With OR set up, AF mute will not release when only

DTMF matches.

With a conventional group not set up with QT or DQT,

only the carrier is considered when signalling matches.

■ Auto Reset

If option signalling matches a group set up with option signalling, option signalling is released. After matching option signalling, option signalling will temporarily reset automatically.

■ Dead Beat Disable

If the D.B.D. code matches, a predetermined action will occur. Whether option signalling is activated or not, when D.B.D. matches on any group, the transceiver will become TX inhibited or TX/RX inhibited. While D.B.D. is active, if the D.B.D. code + “#” code is received, D.B.D. will disactivate.

When D.B.D. matches, transpond will function. Alert will not be output, and option signalling match icon will not appear.

5-2. MSK

Built-in MSK (FleetSync™ : Fleet-ID) decoder is available for option signalling. When the group ID matches, squelch remains muted while the station waits for reception of proper MSK signal. When MSK signal matches, squelch unmutes.

■ Example of call types;

[100][ALL ] : <Group Call> All the units whose fleet number is “100” are called. [100][1000] : <Individual Call> The unit, whose the fleet number is “100” and ID number is “1000”, is called. [ALL][ALL ] : <Broadcast Call> All the units are called. [ALL][1000] : <Supervisor Call> All ID “1000” are called regardless of their fleet number.

■ Unit ID Encode Block

Encode ID Block can be set to limit manual dial ID. The radio unit will not accept an ID other than these IDs which are entered from the keypad. If Inter-fleet Call is enabled, block ID setting affects each fleet group.

6-5. Status Message

Using a 2-digit number, you can send and receive a Status message which may be decided in your talk group. Each Status may be displayed with 16 alphanumeric characters if programmed in the radio. A maximum of 9 received messages can be stored in the stack memory, and it can be reviewed after reception. If the message memory becomes full, the oldest one will be erased. The stack memory will be cleared by turning radio power off.

OPERATING FEATURES

TK-480/481

■ Status 80~99 (Special)

Status numbers from 80 to 99 are reserved for special purposes. Entering these statuses from the DTMF keypad can be inhibited.

Please notice that the following status numbers are used for special purposes;

80~87 : Reserved for future use.

88 : Terminates to emergency mode.

89 : Request for hornalert (For Mobile).

90 : Remote stun on. Disable the received radio unit’s

TX.

91 : Remote stun on. Disable the received radio unit’s

TX/RX.

92 : Cancel remote stun. Enable the received radio unit’s

TX/RX.

93 : Acknowledgement status sent when the radio unit is

in stun mode (TX disabled).

94 : Acknowledgement status sent when the radio unit is

in stun mode (TX/RX disabled).

95~97 : Reserved for future use.

98 : Man Down Emergency status.

99 : Emergency Status.

Note : Remote stun works with DTMF D.B.D. function also.

■ Automatic Status Response

If you pre-select a status number and leave the radio in the Status Mode, it can automatically respond with the selected status number upon request from the base station. (The request function is initiated by serial control on the base station (Optional).)

6-6. Short Message (Optional)

A maximum of 48 characters can be sent (External equipment is required). Received Short Messages will be displayed in the same manner as a Status Message. A maximum of 4 received messages can be stored in the stack memory. In the Stack Mode, 3-digit LCD indicates the received Short Message as “M01”~”M04".

6-7. Long Message (Optional)

A maximum of 1024 characters can be sent (External equipment is required). Received Long Message will not be displayed or stacked in the radio memory but is output through the COM (Data) port.

6-8. Emergency Function

Emergency status 99 will be sent at the beginning of each emergency transmission.

■ FleetSync™ Baud Rate

MSK data baud rate setting. The same rate must be set

as a communication partner.

1200bps : Data communication is made in 1200bps. The communication area is much wider than 2400bps. Recommended for repeater operation. 2400bps : Data communication is made in 2400bps. The communication area is narrower than 1200bps, but it will decrease the data traffic. Data rate 2400bps may not work properly depending on the repeater’s characteristic.

■ Message Mode Timer

Message Mode Timer is a delay timer returning from

message/stack mode to Normal mode.

■ Status/Short/Long Message on Data Group

Status/Short/Long Message transmission is made

whether on the Data System/Group.

■ Status/Short/Unit ID Message Serial Output

(Option)

Whether a received Status/Short message or PTT ID is

output or not from serial port.

■ Call Alert (Continuous)

The radio can provide the alert tone repeatedly until next

operation.

■ PTT ID Sidetone

This function allows a single beep sound after the PTT ID

(MSK) for FleetSync singalling is encoded.

■ Caller ID Stack

The radio stores the last 3 received caller IDs to volatile

memory.

■ Caller ID Display

PTT ID is displayed on LCD.

6-10. Parameters

■ GTC Count

Number of Go To data Channel messages to be sent before transmitting a data message if it is being made on Data System/ Group. If a radio unit receives a GTC message, it will move to the Data System/Group of the current system. Increase this item to make sure the called radio unit moves to the Data System/Group.

■ Emergency Status response

“Alert” can be selected for the called radio unit’s response to reception of status 99 which is used as an emergency status.

6-9. Other Functions

■ Manual Dial

Fleet, ID and Status numbers can be entered from DTMF keypad. (DTMF microphopne is required.)

■ Random Access (Contention)

When a channel (or all the repeater channels for Trunking mode) is busy, radio unit will not transmit (depending on its Busy Channel Lockout setting in conventional mode). As soon as a channel is cleared, some transmissions may crash. Random access is used to avoid this by employing a random transmission sequence.

TK-480/481

OPERATING FEATURES

■ Number of Retries

Number of Retries is the maximum number of retry transmission when no acknowledgement is received in the Maximum ACK Wait Time. Increase this item to improve data communication reliability.

■ TX Busy Wait Time

TX Busy Wait Time is the maximum amount of time before giving up the data transmission when the channel (or all the repeater channels for Trunking mode) is busy. Also, this timer affects if it expires during Random Access period.

■ Maximum ACK Wait Time

Maximum ACK Wait Time is the maximum amount of time to wait for an acknowledgement from the called radio unit. It is used as an interval time of retries. It must be set greater than the ACK Delay Time of the called radio unit.

■ ACK Delay Time

ACK Delay Time is the amount of time from the end of receiving a data to the beginning of sending an acknowledgement. It should be adjusted as the repeater’s hang-up delay time. Also, it must be set less than the Maximum ACK Wait Time of the calling radio unit.

■ TX Delay Time (RX Capture)

TX Delay Time is the amount of unmodulated transmission to let the called unit stop scanning or exit its battery save mode. It is used only when starting a data communication sequence.

■ Data TX Modulation Delay Time

Data TX Modulation Delay Time is the amount of time from the beginning of transmission to the beginning of a data modulation. It is used every time data is transmitted. It must be set to more than 300ms if data communication is made in Trunking Mode.

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.

7-1. Power On Tone

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

7-2. Alert Tone

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

7-3. DBD On Tone

When a D.B.D. code is received, transpond tone sounds.

7-4. DBD Off Tone

When a D.B.D. release code is received, transpond tone

sounds.

7-5. Password Agreement Tone

When the correct password is entered, the tone sounds.

The optional feature's control tone can be set to yes or no.

7-6. PTT Release Tone

When you release the PTT switch, the PTT release tone

sounds.

7-7. Busy Tone

Sounds in LTR mode, when you cannot use a repeater (system busy or TX inhibit). Sounds in conventional mode, when busy channel lockout is functioning. You can select yes or no for the optional feature's warning tone.

7-8. Group Call Tone

Sounds when a group call with the correct DTMF option signalling is received, repeats 7 times. You can select yes or no for the optional feature's warning tone.

7-9. Individual Call Tone

Sounds when an individual call with the correct DTMF option signalling is received. You can select yes or no for the optional feature's warning tone.

7-10. Key Press Tone [A]

Sounds when a key is pressed. For toggle keys, sounds when toggle function is turned on (key press tone [B] sounds when it is turned off). You can select yes or no for the optional feature's control tone.

7-11. Key Press Tone [B]

Sounds when a key is pressed. For toggle keys, sounds when the toggle function is turned off (key press tone [A] sounds when it is turned on). You can select yes or no for the optional feature's control tone.

7-12. Key Press Tone [C]

Sounds when a key is pressed. Also sounds when storing data, adding a DTMF code to memory, and when changing test mode settings. You can select yes or no for the optional feature's control tone.

7-13. Key Input Error Tone

Sounds when a key is pressed but that key cannot be used. You can select yes or no for the optional feature's warning tone.

7-14. Roll Over Tone

Sounds at the smallest system/group. You can select yes or no for the optional feature's control tone.

7-15. Transpond Tone

Sounds when an individual call with the correct LTR/ DTMF option signalling is received. For group calls, only the group tone will sound, not the transpond tone.

TK-480/481

User mode

Panel test mode

PC mode

Firmware programming mode

Panel tuning mode

Data programming mode

PC test mode PC tuning mode

Clone mode

OPERATING FEATURES / REALIGNMENT

7-16. Intercept Tone

This tone indicates that the transceiver is out of range. It indicates that the PTT button is pressed, and transmission has started, but the repeater cannot be connected and talking is not possible. It is output until the PTT button is released. (The mid tone and low tone are output alternately in 200ms intervals.)

7-17. Delay Tone

This tone is output when the PTT button is pressed and the repeater is accessed three times or more to indicate connection with the repeater is delayed. This tone is the same as the busy tone. (It is not output of clear to talk has been set to yes.)

7-18. Proceed Tone

This tone is output when the PTT button is pressed, transmission starts, and the repeater is connected to indicate that the user can talk if the clear to talk function has been set. (The high tone is output for 100ms.)

7-19. Queue Tone

This tone is output until the auto TEL function is set and the TEL channel is accepted successfully. (The mid tone on for 50ms, off for 50ms, and on for 50ms in 1 second intervals.)

7-20. Deny Tone

This tone is output if the auto TEL function is set, the queue tone is output, but the TEL channel cannot be accessed within 60 seconds. It is similar to the intercept tone. (The mid tone and low tone are output alternately in 150ms intervals.)

7-21. Free System Ringback Mode Tone, System

Search Mode Tone

This tone indicates that the transceiver is free system ringback mode or system search mode. (The mid tone is output for 400ms.)

7-22. Ringing Tone

This tone indicates that the transceiver can use the repeater in free system ringback mode. (The mid tone and no tone are output eight cycles alternately in 50ms intervals.)

7-23. System Search Tone

Sounds when the system changes during system search. You can select yes or no for the optional feature's warning tone.

REALIGNMENT

1. Modes

Mode Function

User mode For normal use.

Panel test mode Used by the dealer to check the funda-

mental 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 program- Used to read and write frequency data

ming 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 tuning.

Firmware program- Used when changing the main program

ming mode of the flash memory.

Clone mode Used to transfer programming data from

one radio to another.

2. How to Enter Each Mode

Mode Operation

User mode Power ON

Panel test mode [A]+Power ON (Two seconds)

PC mode Received commands from PC

Panel tuning mode [Panel test mode]+[S]

Firmware programming mode [S]+Power ON (Two seconds)

Clone mode [C]+Power ON (Two seconds)

3. Panel Test Mode

Setting method refer to ADJUSTMENT.

7-24. System Search End Tone

Sounds when a possible connection to a repeater in system search is not mode. You can select yes or no for the optional feature’s warning tone.

4. Panel Tuning Mode

Setting method refer to ADJUSTMENT.

TK-480/481

REALIGNMENT

5. PC Mode

5-1. Preface

The TK-480/481 transceiver is programmed by using a

personal computer, programming interface (KPG-36) and programming software (KPG-49D).

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-480/481 to the personal computer with the interface cable.

2. When the POWER switch on, user mode can be entered immediately. When PC sends command the radio enter PC mode, and “PROGRAM” is displayed on the LCD. When data transmitting from transceiver, the red LED is blinking. When data receiving to transceiver, the green LED is blinking.

Notes:

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

• Change the TK-480/481 to PC mode, then attach the interface cable.

5-3. KPG-36 description (PC programming interface cable: Option)

The KPG-36 is required to interface the TK-480/481 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-36 connects the universal connector of the TK-

480/481 to the computers RS-232C serial port.

5-4. Programming software description

The KPG-49D programming disk is supplied in 3-1/2" disk

format. The software on this disk allows a user to program TK-480/481 radios via programming interface cable (KPG-

36).

5-5. Programming with IBM PC

If data is transferred to the transceiver from an IBM PC

with the KPG-49D, 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-49D instruction manual parts No. : B62-1096-XX

IBM-PC

KPG-36

KPG-49D

Fig. 1

6. Firmware Programming Mode

6-1. Preface

Flash memory is mounted on the TK-480/481. This allows the TK-480/481 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-480/481 to the personal computer (IBM PC or compatible) with the interface cable (KPG-36). (Connection is the same as in the PC Mode.)

6-3. Programming

1. Start up the programming software (KPG-49D), select

“firmware program” in the “Program” item, and press

the Return key on the personal computer. This starts up

the firmware programmer.

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. Turn the TK-480/481 power ON with the [S] switch held

down. Hold the switch down for two seconds until the

display changes to “PROG 57600”. When “PROG

57600” appears, release your finger from the switch.

6. Check the connection between the TK-480/481 and the

personal computer, and make sure that the TK-480/481 is

in the Program mode.

7. Press F10 on the personal computer. A window opens on

the display to indicate progress of writing. When the TK-

480/481 starts to receive data. the [P] icon is blinking.

8. If writing ends successfully. the LED on the TK-480/481

lights and the checksum is displayed.

9. If you want to continue programming other TK-480/481 s,

repeat steps 5 to 8.

REALIGNMENT

TK-480/481

Notes:

• To start the Firmware Programmer from KPG-49D, the Fpro path must be set up by KPG-49D Setup.

• This mode cannot be entered if the Firmware Programming mode is set to Disable in the Programming software (KPG-49D).

• When programming the firmware, it is recommend to copy the data from the floppy disk to your hard disk before update the radio firmware. Directry 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 [MON] switch (top of left side) while “PROG 57600” is displayed, the checksum is displayed. If you press the [MON] switch again while the checksum is displayed, “PROG 57600” is redisplayed.

2. If you press the [LAMP] switch (bottom of left side) while “PROG 57600” is displayed, the display changes to “PROG 19200” to indicate that the write speed is low speed (19200 bps). If you press the [LAMP] switch again while “PROG 19200” is displayed, the display changes to “PROG 38400”, and the write speed becomes the middle-speed mode (38400 bps). If you press the [LAMP] switch again while “PROG 38400” is displayed, the display returns to “PROG 57600”.

How to enter the password with the encoder; If the encoder is rotated while “CLONE LOCK” is displayed, numbers (0 to 9) are displayed flashing. When you press the [S] key, the currently selected number is determined. If you press the [S] key after entering the password in this procedure, “CLONE MODE” is displayed if the entered password is correct. If the password is incorrect, “CLONE LOCK” is redisplayed.

4. Power on the slave TK-480/481.

5. Connect the cloning cable (No. E30-3325-05) to the universal connectors on the master and slave.

6. Press the [S] key on the master while the master displays “CLONE MODE”. The data of the master is sent to the slave. While the slave is receiving the data, “PROGRAM” 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.

7. The other slave can be continuously cloned. When the [S] key on the master is pressed while the master displays “END”, the master displays “CLONE MODE”. Carry out the operation in step 4 to 6.

Note:

Only the same models can be cloned together.

Note:

Normally, write in the high-speed mode.

7. Clone Mode

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

1. Turn the master TK-480/481 power ON with the [C] key

held down. If the password is set to the TK-480/481, the

TK-480/481 displays “CLONE LOCK”. If the password is

not set, the TK-480/481 displays “CLONE MODE”.

2. When “CLONE LOCK” is displayed, only the knob (en-

coder) and [S], and [0] to [9] keys can be accepted. When

you enter the correct password, and “CLONE MODE” is

displayed, the TK-480/481 can be used as the cloning

master. The following describes how to enter the pass-

word.

3. How to enter the password with the keypad;

If you press a key while “CLONE LOCK” is displayed.

The number that was pressed is displayed on the TK-480/

481. Each press of the key shifts the display in order to

the left. When you enter the password and press the [S]

key, “CLONE MODE” is displayed if the entered pass-

word is correct. If the password is incorrect, “CLONE

LOCK” is redisplayed.

Cloning cable (E30-3325-05)

Fig. 2

TK-480/481

CIRCUIT DESCRIPTION

1. Overview

This transceiver is an 800/900MHz band EFJ LTR™

trunked system compatible FM portable transceiver that can be programmed to operate on both LTR and conventional systems.

2. Circuit Configuration by Frequency

The receiver is a double-conversion superheterodyne

with a first intermediate frequency (IF) of 44.85MHz and a second IF of 455kHz. Incoming signals from the antenna are mixed with the local signal from the PLL to produce the first IF of 44.85MHz.

This is then mixed with the 44.395MHz second local os-

cillator output to produce the 455kHz second IF. This is detected to give the demodulated signal.

The transmit signal frequency is generated by the PLL

VCO, and modulated by the signal from the microphone. It is then amplified and sent to the antenna.

TK-480

TX 806~825MHz

851~870MHz

RX 851~870MHz

ANT

AMP

TK-481

TX 896~902MHz

935~941MHz

RX 935~941MHz

1st MIX

44.85MHz

TK-480 :

806.15~825.15MHz TK-481 :

890.15~896.15MHz

TK-480 806~825MHz 851~870MHz

MCF

TK-481 896~902MHz 935~941MHz

455kHz

IF SYSTEM

44.395 MHz

PLL

VCO

AMP

MIC

AMP

MIC

3. Receiver System

3-1. RF unit

An incoming RF signal from the antenna terminal is passed through the antenna switch (D7, D9, and D10 are off) and then the bandpass filter (L11). The signal is amplified by RF amplifier Q9, and passed through the bandpass filter (L20) to remove the spurious signal again. The resulting signal is applied to the first mixer (Q6), where it is mixed with the first local oscillator signal output from the frequency synthesizer to produce the first IF (44.85MHz).

3-2. IF unit

The first IF signal is passed through a four-pole monolithic crystal filter (XF1) to remove a adjacent channel signal. The filtered first IF signal is amplified by the first IF amplifier (Q5) and then applied to the IF system IC (IC9). 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 44.395MHz of second local oscillator output (crystal unit X1) and produces the second IF signal of 455kHz.

The second IF signal is passed through the ceramic filter (CF1,2) to more remove the adjacent channel signal. The filtered second IF signal is amplified by the limiting amplifier and demodulated by the quadrature detector with ceramic discriminator (CD1). The demodulated signal is routed to the audio circuit.

Fig. 1 Frequency configuration

ANT

IC12

L30 D9,D10

HPF

ANT

LPF

L11 BPFQ9RF AMP

HPF BEF

L20 BPFQ61st MIX

1st local OSC (PLL)

DE-

EMP

EXP

XF1

MCFQ51st IF

MUTE

Fig. 2 Receiving system

2nd local OSC

IC3 (2/2)

AF AMP

IC9

MIX,DET,IF

IC4

VOL

IC8 (2/2) AF AMP

AF AF

CF1 CF2

Q310

SSW

VC1

VC2

IC300

AF PA

EXT. SP

INT. SP

CIRCUIT DESCRIPTION

SQ voltage

ANT input level

SQ close

SQ open

RSSI voltage

ANT input level

Preset value

TK-480/481

3-3. Audio amplifier circuit

The demodulated signal from IC9 is amplified by IC8 (2/

2), high-pass filtered, low-pass filtered, high-pass filtered, band-eliminate filtered,and de-emphasized by IC12.

The signal then goes through an AF amplifier IC3 (2/2), an electronic volume control (IC4), and an AF switch (Q310 is on), and is routed to audio power amplifier (IC300), where it is amplified and output to the internal speaker.

The audio mute signal (AM) from the microcomputer becomes Low in the standby and Q304, Q305 which are power supply circuit for IC300 turn off. Also, IC12 is set to the power down mode according to data from microprocessor, and the AF signal is muted. When the audio is output, AM becomes High to turn Q304, Q305 ON, and voltage is supplied to power terminal VP of IC300. Also, IC12 is canceled out of the power down mode.

The speaker is switched by the logic of speaker switching terminal SSW on the universal connector. When SP-MIC is not attached, the logic of SSW becomes High and SW (Q310) is turned ON, and the AF signal is input to both amplifiers of IC300.

When SP-MIC is attached, SSW is connected to GND at inside of SP-MIC. For this reason, Q310 is turned OFF, and the AF signal is input only to amplifier for EXT SP of IC300.

Change of INT/EXT SP refer to Fig. 3.

AM SSW VC1 VC2 SP

H H H L INT

H L L H EXT

L H L L MUTE

L L L L MUTE

3-4. Squelch circuit

The output from IC9 enters FM IC again, then passed through a band-pass filter. The noise component output from IC9 is amplified by Q19 and rectified by D3 to produce a DC voltage corresponding to the noise level. The DC voltage is sent to the analog port of the CPU (IC15). And IC9 outputs a DC voltage (RSSI) corresponding to the input of the IF amplifier. The CPU reads the RSSI signal via pin 24.

IC15 determines whether to output sounds from the speaker by comparing the input voltage of pin 28 and pin 24 with the preset value.

IC9 : FM IF IC

IF AMP

DET

RSSI BPF

AMP

Q19 D3

NOISE

AMP

DET

IC15 CPU

Fig. 4 Squelch circuit

SSW

Q301

Q308

Q305

Q304

VC1

VC2

Fig. 3 Audio amplifier circuit

IC300

Fig. 5

INT. SP

4. Transmitter System

Squelch and RSSI voltage vs ANT input level

4-1. Microphone amplifier

EXT. SP

The signal from the internal microphone goes through the mute switch (Q300).

When the SP-MIC is not attached, the microphone switching terminal (MSW) on the universal connector becomes High, and mute switch (Q300) is turned ON. When the SP-MIC is attached, MSW is connected to GND at inside of SP-MIC. For this reason, Q300 is turned OFF, the internal microphone is muted, and only the input of the external microphone is supplied to the microphone amplifier of the TXRX unit.

TK-480/481

CIRCUIT DESCRIPTION

The signal from microphone passes through the limitter circuit in D11, and through the high-pass filter, the ALC circuit, the low-pass filter, the high-pass filter, and pre-emphasis/IDC circuit in IC12. When encoding DTMF, mute switch (Q7) is turned OFF for muting the microphone input signal.

The signal passes through the D/A converter (IC4) for the maximum deviation adjustment, and enters the summing amplifier consisting of IC3 (2/2), and is mixed with the low speed data from the CPU (IC15).

The output signal from the summing amplifier passes through the D/A converter (IC4) again for the TA maximum deviation adjustment,and the AF switch (Q21 is off in TX), and goes to the VCO modulation input.

The other output signal from the summing amplifier passes through the D/A converter (IC4) again for the BAL adjustment,and the buffer amplifier (IC1 (2/2)), and goes to the VCXO modulation input.

EXT.

MIC

Q300

MIC

D11

LIMIT

HPF ALC

4-2. Drive and Final amplifier

The signal from the T/R switch (D5 is on) is amplified by

the pre-drive (Q11) and drive amplifier (Q12) to 50mW.

The output of the drive amplifier is amplified by the RF power amplifier (IC30) to 2.5W (1W when the power is low). The RF power amplifier consists of two stages MOS FET transistor. The output of the RF power amplifier is then passed through the harmonic filter (LPF) and antenna switch (D7 is on) and applied to the antenna terminal.

4-3. APC circuit

The APC circuit always monitors the current flowing through the RF power amplifier (IC30) and keeps a constant current. The voltage drop at R127, R128 and R129 is caused by the current flowing through the RF power amplifier and this voltage is applied to the differential amplifier (IC21 1/2).

IC21 (2/2) compares the output voltage of IC21 (1/2) with the reference voltage from IC4, and the output of IC21 (2/2) controls the VGG of the RF power amplifier to make the both voltages to same voltage.

The change of power high/low is carried out by the change of the reference voltage. Q14,15 and 18 are turned on in transmit and the APC circuit is active.

DTMF

98IC12

PRE EMP

IDC

COMP LPF HPF

MUTE

MSW

Q301

IC4

D/A

LSD

IC3 (2/2)

SUM AMP

IC4

D/A

IC4

D/A

Fig. 6 Microphone amplifier

From

T/R SW

(D5)

REF

VOL

(IC4)

Q11

Pre-DRIVE

AMP

R127

R128

R129

Q12

DRIVE

AMP

IC21 (1/2)

IC30

POWER AMP

VDD VGG

IC21 (2/2)

LPF

Fig. 7 Drive and final amplifier and APC circuit

Q21

MUTE

IC1

BUFF

AMP

ANT

IC14

VCO

VCXO

ANT

CIRCUIT DESCRIPTION

TK-480/481

5. Frequency Synthesizer Unit

5-1. Frequency synthesizer

The frequency synthesizer consists of the VCXO (X2),

VCO (IC14), PLL IC (IC11) and buffer amplifiers.

The VCXO generates 16.8MHz. The frequency stability is

1.5ppm within the temperature range of –30 to +60°C. The

frequency tuning and modulation of the VCXO are done to apply a voltage to pin 1 of the VCXO. The output of the VCXO is applied to pin 8 of the PLL IC.

The TK-480’s VCO covers a dual range of the 806~

825MHz, and the 851~870MHz. The VCO generates

806.15~825.15MHz for providing to the first local signal in receive. In TA mode, the pin 1 of the VCO goes low and the VCO generates 851~870MHz.

The TK-481’s VCO covers a dual range of the 896~

902MHz, and the 935~941MHz. The VCO generates

890.15~896.15MHz for providing to the first local signal in receive. In TA mode, the pin 1 of the VCO goes low and the VCO generates 935~941MHz.

The output of the VCO is amplified by the buffer amplifier (Q8) and routed to the pin 5 of the PLL IC. Also the output of the VCO is amplified by the two-buffer amplifier (Q10, Q17) and routed to the next stage according to T/R switch (D4, D5).

The PLL IC consists of a prescaler, fractional divider, reference divider, phase comparator, charge pump. This PLL IC is fractional-N type synthesizer and performs in the 100kHz reference signal which is eighth of the channel step (12.5kHz). The input signal from the pins 1 and 5 of the PLL IC is divided down to the 100kHz and compared at phase comparator. The pulsed output signal of the phase comparator is applied to the charge pump and transformed into DC signal in the loop filter (LPF). The DC signal is applied to the pin 3 of the VCO and locked to keep the VCO frequency constant.

PLL data is output from DT (pin 52), CP (pin 64) and EP (pin 69) of the microprocessor (IC15). The data are input to the PLL IC when the channel is changed or when transmission is changed to reception and vice versa. A PLL lock condition is always monitored by the pin 21 (UL) of the microprocessor. When the PLL is unlocked, the UL goes low.

6. Control Circuit

The control circuit consists of microprocessor (IC15) and its peripheral circuits. It controls the TX-RX unit and transfers data to and from the display unit. IC15 mainly performs the following;

1) Switching between transmission and reception by PTT signal input.

2) Reading system, group, frequency, and program data from the memory circuit.

3) Sending frequency program data to the PLL.

4) Controlling squelch on/off by the DC voltage from the squelch circuit.

5) Controlling the audio mute circuit by decode data input.

6) Transmitting tone and encode data.

6-1. Memory circuit

Memory circuit consists of the CPU (IC15) and a flash memory (IC17), a flash memory has a capacity of 2M bits that contains the transceiver control program for the CPU and data such as transceiver channels and operating features.

This program can be easily written from an external devices. The data, such as operating status, is programmed into the EEPROM (IC16).

• Flash Memory

Note : The flash memory holds data such as written with

the FPU (KPG-49D), firmware program (User mode, Test mode, Tuning mode, etc.) This data must be rewritten when replacing the flash memory.

• EEPROM

Note : The EEPROM stores tuning data (Deviation, Squelch,

etc.). Realign the transceiver after replacing the EEPROM.

IC15

CPU

IC16

EEPROM

(TA : Low)

CPU

IC15

BUFF

VCXO

Q10

BUFF

LPF

DT,CP,EP

IC14

VCO

IC11

PLL

Fig. 8 PLL block diagram

Q17

BUFF

IC1

To mixer

BAL

To drive amp

FLASH

IC17

Fig. 9 Memory circuit

TK-480/481

BUFF

AMP

VCXO

X2IC1

MUTE

VCO

IC14Q21

LPF

HSD OUT

IC23

R111 R107

C141

C138

R148

LSD OUT

IC15 CPU

IC4

D/A (ADJ)

SUM

MIC IN

SUM

IC3 (1/2)

IC12

AF AMPSUM

IC3 (2/2)

RX audio

CIRCUIT DESCRIPTION

6-2. Low battery warning

The battery voltage is monitored by the microprocessor (IC15). When the battery voltage falls below the voltage set by the Low Battery Warning adjustment, the red LED flashes to notify the operator that it is time to replace the battery. If the battery voltage falls even more (approx. 5.8V), a beep sounds and transmission is stopped.

Low battery warning Battery condition

The red LED flashes during The battery voltage is low but

transmission the transceiver is still usable.

The red LED flashes and The battery voltage is low and

continuous beep sounds the transceiver is not usable to

while PTT pressed make calls.

6-3. Key input

If the clock is supplied to CLK terminal when the RES terminal (CPU pin 53) of the decade counter (IC301) is set to Low, Q0 to Q7 become High sequentially. Normally, KI1 and KI2 are Low (pulled down). When any key is pressed, KI1 or KI2 become High. The CPU detects which key is pressed, according to the voltage of KI1 and KI2 and clock timing.

Q1 Q0 Q2 Q6

Q7 Q3 Vss

KRST

IC301

Vdd

RES CLK

Q9 Q4 Q8

KI1

KI2

IC15 CPU

7. Signalling Circuit

7-1. Encode

• Low-speed data (QT,DQT,LTR)

Low-speed data is output from pin 36 of the CPU. The signal passes through a low-pass CR filter, and goes to the summing amplifier (IC3 1/2). The signal is mixed with the audio signal and goes to the VCO (IC14) and VCXO (X2) modulation input after passing through the D/A converter (IC4) for BAL adjustment.

• High-speed data (DTMF)

High-speed data is output from pin 35 of the CPU. The signal passes through a low-pass filter consisting of IC23, and provides a TX DTMF tone and a RX DTMF tone including a beep tone. The TX DTMF tone is passed to the D/A convertor (IC4) for DTMF deviation adjustment, and then applied to the audio processor (IC12).

The signal is mixed with the audio signal and goes to the VCO and VCXO. The RX DTMF tone is passed a summing amplifier (IC3 2/2), the D/A convertor (IC4) for audio control, audio power amplifier and then to the speaker.

• MSK

MSK signal is output from pin 6 of IC12. The signal passes through the D/A converter (IC4) for the MSK deviation adjustment, and is routed to the VCO. When encoding MSK, the microphone input signal is muted.

RESET

CLOCK

INHIBIT

CARRY

OUT

16 keys

Fig. 10 Key input

Fig. 11 Decade counter timing chart

Fig. 12 Encode

CIRCUIT DESCRIPTION

TK-480/481

7-2. Decode

• Low-speed data (QT,DQT,LTR)

The demodulated signal from the IF IC (IC9) is amplified by IC8 (1/2) and passes through a low-pass filter (IC10) to remove audio components. The signal is input to pin 23 of the CPU.

The CPU digitizes this signal, performs processing such as DC restoration, and decodes the signal.

• High-speed data (DTMF)

The DTMF input signal from the IF IC is amplified by IC8 (1/2) and goes to IC13, the DTMF decoder. The decoded information is then processed by the CPU. During transmission and standby, the DTMF IC is set to the power down mode when the PD terminal is High. When the line is busy, the PD terminal becomes Low, the power down mode is canceled and decoding is carried out.

• MSK

The MSK input signal from the IF IC is amplified by IC8 (1/

2) and goes to pin 5 of IC12. The signal is demodulated by MSK demodulator in IC12. The demodulated data goes to the CPU for processing.

IC8

AMP

IC12

XOUT

IC10

LPF

IC13

DTMF

DECODE

OSC1

DCK,SD,STD

LSD IN

IC15 CPU

DT,CK,CE

IC19

Fig. 13 Decode

8. Power Supply Circuit

Battery +B is supplied via a 3A fuse from the battery terminal connected to the TX-RX unit. After passing through the power switch, power supply (SB) is applied to the three AVRs. IC5 supplies 5V (5M) to the control circuit, and IC7 supplies 5V (5C) to common circuits. IC6 supplies to the TX circuit and the RX circuit. During transmission, 5TC becomes Low and Q2 is turned ON to supply 5V (5T) to the TX circuit. During reception, 5RC becomes Low and Q1 is turned ON to supply 5V (5R) to the RX circuit.

ON/OFF

VOL

Display unit

RF power amp (IC30)

IC5

IC7

IC6

5TC

5RC

Fig. 14 Power supply circuit

9. Optional Board Terminal

Terminals for mounting the option board are provided at the bottom edge of the TX-RX unit. The table below shows the correspondence between the board and terminals. R422, R32, R250, R259, R147, R276, R421 may have to be removed depending on the type of option board being used.

Name Function

SB Battery (7.5V)

GND Ground

TXD Serial data

RXD Serial data

SQ Busy: high

LOK Link acquired : low (TX mode)

DI/ANI Modulation (ANI) input

DEO Detect output

TXAI/MUTE Modulation output from board or mic mute: low

TXAO Modulation input to board

RXAI Received signal input to board

RXAO Received signal output from board

D1 Binary 1

D2 Binary 2

OPT Scramble, Emergency: low

PTTIN PTT switch signal input to board (TX: low)

5CNS Battery (5V)

DI9 9600 bps data output

RXEMAO

RXEMAI

PTTOUT PTT switch signal output from board (TX: low)

MONI Busy: low

LAMP Busy: low

AAC

Audio Beep Beep signal output from board

AUX TXD Serial data

AUX RXD/EXTSW

Table 1 Terminal name and function

Received signal output from board (after de-emphasis)

Received signal input to board (after de-emphasis)

Audio Amp Control signal output from board (Busy: high)

Serial data/Option switch port

TK-480/481

SEMICONDUCTOR DATA

Microprocessor : 30622M8A-4F9GP (TX-RX Unit IC15)

■ Pin function

Pin No. Port name I/O Function

1 LSDOUT O Low speed data output.

2 HSDOUT O High speed data output.

3 HSDIN I Not used.

4 DTMSTD I DTMF decode IC data detect input.

5 SELF I Not used.

6 BYTE I +5V.

7 CNVSS I GND.

8 SFTOE O Shift register output enable.

9 LCDCS O LCD driver chip select output.

10 RESET I Microcomputer reset input.

11 XOUT - 9.8304MHz (System clock).

12 VSS - GND.

13 XIN - 9.8304MHz (System clock).

14 VCC - +5V

15 AUX I AUX switch input.

16 AFTRD I MSK modulation data output timing

pulse input.

17 AFRTM I MSK demodulation data input timing

pulse input.

18 EN2 I Encoder pulse input 2.

19 PLLCLK O PLL IC clock output.

20 BEEP O Beep data output.

21 AFRDT I MSK demodulation data input.

22 AFREG1 O AF IC register switching data output 1.

23 AFREG2 O AF IC register switching data output 2.

24 EEPDAT O EEPROM data output.

25 DACSTB O D/A converter IC data strobe output.

26 AFCLR O MSK flame reset output.

27 SAVE O Not used.

28 LAMP I LAMP switch input.

29 AUXTXD O External Serial interface output.

30 AUXRXD I External Serial interface input.

31 PLLUL I PLL unlock detect input.

32 AFMSKE O

33 TXD O Serial interface output (ex. PC).

34 RXD I Serial interface input (ex. PC).

35 AFDAT O MSK data output.

36 PTT I PTT switch input.

37 RDY - Not used.

38 ALE - Not used.

MSK modulation enable (Enable active “H”).

Pin No. Port name I/O Function

39 HOLD - Not used.

40 HLDA - Not used.

41 BLCK - Not used.

42 RD - Flash memory RD bus.

43 BHE - Not used.

44 WR - Flash memory WR bus.

45 DTMCLK O DTMF decode IC clock output.

46 CNTCLK O Common clock output.

47 PLLSTB O PLL IC data strobe output.

48 CS0 O Flash memory chip enable.

49 A19 - Not used.

50~59 A18~A9 - Flash memory address bus.

60 VCC - +5V

61 A8 - Flash memory address bus.

62 VSS - GND.

63~70 A7~A0 - Flash memory address bus.

71 MONI I Monitor switch input.

72 EN4 I Not used.

73 EN3 I Not used.

74 EN1 I Encoder pulse input 1.

75 MINDAT O Common data output.

76 KEY2 I Key scan input 2.

77 KEY1 I Key scan input 1.

78 RESET O Key scan IC reset output..

79~86 D7~D0 - Flash memory data bus.

87 DTMDAT I DTMF decode IC data input.

88 PF I PF switch input.

89 VOL I Volume level input.

90 BATT I Battery voltage input.

91 ANLSQL I Squelch level input.

92 TEMP I Not used.

93 RSSI I

94 AVSS - GND.

95 LSDIN I Low speed data input.

96 VREF - +5V

97 AVCC - +5V

98 SFTSTB1 O Shift register data strobe output.

99 W/N O Not used.

100 AFSTB O AF IC data strobe output.

Received signal strength indicator input

(RSSI).

SEMICONDUCTOR DATA

TK-480/481

Shift Register 1 : BU4094BCFV (TX-RX Unit IC18)

Pin No.

Port

Port name

Function

1 STRB ES Strobe

2 DATA DAT Data

3 CLK CK Clock

4 Q1 LEDR Red LED. H : On, L : Off

5 Q2 LEDG Green LED. H : On, L : Off

6 Q3 KEYBLT Key backlight. H : On, L : Off

7 Q4 MMUTE MIC mute. H : Unmute, L : Mute

8 VSS GND.

9 QS IC18 data output.

10 Q’S NC

11 Q8 DTMPD DTMF decode IC power down.

H : Power down, L : Busy

12 Q7 Not used.

13 Q6 5TC TX power control. H : RX, L : TX

14 Q5 5RC RX power control. H : TX, L : RX

15 OE OE Output enable.

16 VDC 5M +5V.

Shift Register 2 : BU4094BCFV (TX-RX Unit IC19)

Pin No.

Port

Port name

Function

1 STRB ES Strobe

2 DATA DAT Data

3 CLK CK Clock

4 Q1 AM1 Audio mute 1. H : Unmute, L : Mute

5 Q2 LOK

Link complete (Programmable active H/L).

6 Q3 TA Talk around. H : Off, L : On

7Q4 NC

8 VSS GND

9QS NC

10 Q’S NC

11 Q8 SQ

External squelch (Programmable active H/L).

12 Q7 CODE2 Option board data 2.

13 Q6 CODE1 Option board data 1.

14 Q5 OPT Option board control.

Please set option board type in the

KPG-49D. H : On, L : Off

Auxiliary signal outut. Please set key

function in the KPG-49D (Program-

mable active H/L).

15 OE OE Output enable.

16 VDC 5M +5V.

VCO System : KCH31, KCH32 (TX-RX Unit IC14)

■ Circuit diagram

C2 C8

C13

D1 : HVC350B D2 : HVC202A D3 : MA2S077

Q1 : 2SK1824 Q2 : 2SC4226(R25) Q3 : 2SC5008

C16

C10

C11

Q2 Q3

C12

C14

4 OUT

C15

C17

5 GND

TK-480/481

SEMICONDUCTOR DATA

PLL System : SA7025DK (TX-RX Unit IC11)

■ Block diagram

CLOCK

DATA

STROBE

Vss

TEST

CCP

REF

AUX

Serial input + Program latches

PR NM1

FBEM

EM÷EA

64/65/72 Prescaler

Reference divider

PA NA

1/4

Prescaler

NM2 NM3

12 8

Main dividers

Main phase

detector

Main

reference

select

÷2 ÷2 ÷2

Auxiliary reference

select

Auxiliary

phase

detector

Auxiliary divider

FMOD NF

Fractional

accumulator

FRD

Prescaler

modulus control

Normal output

charge pump

Speed-up

output

charge pump

Integral output

charge pump

Auxiliary output

charge pump

PHP

PHI

PHA

LOCK

DDA

SSA

■ Pin description

Pin No.

Symbol Description

1 CLOCK Serial clock input.

2 DATA Serial data input.

3 STROBE Serial strobe input.

4VSS Digital ground.

5RFIN Prescaler positive input.

6RFIN Prescaler negative input.

7VCCP Prescaler positive supply voltage. This pin supplies power to the prescaler and RF input buffer.

8 REFIN Reference divider input.

9 RA Auxiliary current setting; resistor to VSSA.

10 AUXIN Auxiliary divider input.

11 PHA Auxiliary phase detector output.

12 VSSA analog ground.

13 PHI Integral phase detector output.

14 PHP Proportional phase detector output.

15 VDDA

Analog supply voltage. This pin supplies power to the charge pumps, Auxiliary prescaler, Auxiliary and Reference buffers.

16 RN Main current setting; resistor to VSSA.

17 RF

Fractional compensation current setting; resistor to V

SSA

18 LOCK Lock detector output.

19 TEST Test pin; connect to VDD.

20 VDD Digital supply voltage. This pin supplies power to the CMOS digital part of the device.

DESCRIPTION OF COMPONENTS

DISPLAY UNIT (X54-3210-XX)

Ref. No.

IC300 IC Audio power amplifier

IC301 IC Counter / Key scan

Q300 FET DC switch / INT MIC on/off

Q301 FET DC switch

Q302 Transistor DC switch / LED (Red) driver

Q303 Transistor DC switch / LED (Green) driver

Q304 Transistor DC switch

Q305 Transistor Current driver / Audio amp AVR

Q306 Transistor DC switch

Q307 Transistor Current driver /

Q308 FET DC switch / SP INT/EXT

Q309 Transistor Temperature compensation

Q310 FET Mute switch

D300 Zener diode Surge absorption

D301 LED LED / Red, Green

D302 Diode Quick discharge / AF mute

D303 Zener diode Voltage reference

D304 Diode Voltage reference

D305~310 LED LCD back light

D315~318 Diode Reverse current prevention

D319~321 Zener diode Surge absorption

TX-RX UNIT (X57-5630-XX)

Ref. No.

IC1 IC Buffer amplifier

IC2 IC Voltage detector / Reset

IC3 IC Summing amplifier

IC4 IC D/A converter (Adjustment)

IC5 IC Voltage regulator / 5M

IC6 IC Voltage regulator / 5V

IC7 IC Voltage regulator / 5C

IC8 IC Buffer amplifier

IC9 IC FM IF system

IC10 IC Active filter / For LSDin

IC11 IC PLL system

IC12 IC Audio processor

IC13 IC DTMF decoder

IC14 IC VCO system

Use/ Function

Operation/Condition

LCD back light LED AVR

Operation/Condition

TK-480/481

Ref. No.

IC15 IC Microprocessor / 16-bit+1M flash

IC16 IC EEPROM

IC17 IC AND gate

IC18,19 IC Shift register / Output expander

IC21 IC Comparator (APC)

IC23 IC Active filter / For HSDout

IC30 IC Power module

Q1 FET DC switch / 5R

Q2 Transistor DC switch / 5T

Q3 Transistor Ripple filter / 5CV

Q4 Transistor TX/RX switch

Q5 Transistor IF amplifier

Q6 FET Mixer

Q7 FET Mute switch / MIC line mute

Q8 Transistor RF amplifier

Q9 FET RF amplifier

Q10 Transistor Buffer amplifier

Q11,12 Transistor RF amplifier / TX driver

Q13 FET DC switch

Q14,15 Transistor DC switch

Q16 Transistor AF mute switch

Q17 Transistor RF amplifier

Q18 FET DC switch

Q19 Transistor Noise amplifier / Squelch

Q20 Transistor Switch

Q21 FET AF mute switch

Q22 FET DC switch

Q23 FET Mute switch

D1 Diode Reverse protection

D2 Diode Overload protection

D3 Diode Noise detection

D4,5 Diode TX/RX switch

D6 Diode Overload protection

D7 Diode ANT switch

D8 Diode Reverse current prevention

D9,10 Diode ANT switch

D11 Diode Voltage clamp

D12 Diode DC switch

D17,18 Diode Surge absorption

Use/ Function

Operation/Condition

TK-480/48 1

PARTS LIST

✽ New Parts. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert.

TK-480/481 DISPLAY UNIT (X54-3210-XX)

Ref. No.

indicates safety critical components.

New

Address

parts

Parts No. Description

TK-480/481

11A✽ A02-3658-03 CABINET ASSY (4KEY) A,B-K 11A✽ A02-3659-03 CABINET ASSY (16KEY) A,B-K2 22B✽ A62-0981-04 PANEL ASSY

4 2C B09-0363-03 CAP (SP/MIC) ACSY 5 2A B38-0810-05 LCD ASSY 61B✽ B43-1139-04 BADGE (KENWOOD) 7 1C B46-0470-00 WARRANTY CARD 92C✽ B62-1483-00 INSTRUCTION MANUAL

10 3A ✽ B72-1968-04 MODEL NAME PLATE A-K,K2 10 3A ✽ B72-1969-04 MODEL NAME PLATE B-K,K2

12 3B E04-0406-05 RF COAXIAL RECEPTACLE (SMA) 15 2B E23-1049-04 TERMINAL (ANT) 51 3A ✽ E23-1166-04 RELAY TERMINAL 16 2A E37-0672-05 FLAT CABLE (C0NT-TX-RX) 17 3A E37-0673-05 LEAD WIRE WITH CONNECTOR (PTT)

18 1A E37-0674-15 LEAD WIRE WITH CONNECTOR (SP) 19 3B E58-0440-05 SQUARE SOCKET (SP/MIC) 52 3A E72-0412-13 TERMINAL BLOCK

54 2A F10-2248-13 SHIELDING CASE (VC0) 55 2A F10-2253-03 SHIELDING PLATE (BAND PASS) 56 2A F10-2255-04 SHIELDING PLATE (P-MODULE) 57 2A F10-2310-03 SHIELDING PLATE (LCD)

- F20-1192-04 INSULATING SHEET

- F20-3303-04 INSULATING SHEET (MIC/GND)

21 1A G01-0881-04 COIL SPRING 22 1B G09-0418-05 KNOB SPRING (VOL,ENC) 23 1B G10-0799-04 FIBROUS SHEET (SP) 24 3A G11-0800-04 SHEET (PTT) 61 3A G11-2544-04 SHEET (CHASSIS)

62 2A G13-1731-04 CUSHION (LCD) 63 3A,3B G13-1762-04 CUSHION (VOL/CHASSIS) 64 3A ✽ G13-1834-04 CUSHION (TERMINAL) 26 3B G53-0811-03 PACKING (TOP) 25 1A G53-0840-02 PACKING (4KEY) A,B-K

25 1A G53-0841-02 PACKING (16KEY) A,B-K2 65 3A ✽ G53-1510-04 PACKING (BATT+) 66 3A ✽ G53-1520-24 PACKING (TERMINAL)

28 2D H12-3014-02 PACKING FIXTURE 29 3D ✽ H52-1096-12 ITEM CARTON CASE A-K,K2 29 3D ✽ H52-1097-12 ITEM CARTON CASE B-K,K2

31 1A J19-1572-04 HOLDER 68 2A J21-8321-03 HARDWARE FIXTURE (P-MODULE) 32 2C J29-0658-05 HOOK ACSY 33 3B J82-0045-05 FPC (VOL,ENC) 34 3B J82-0046-05 FPC (SOCKET)

38 1B K29-5157-03 KNOB (PTT) 39 1B K29-5158-03 KEY TOP (PTT) 40 1A K29-5165-03 LEVER KNOB 36 1B K29-5231-03 KNOB (VOL) 37 1B K29-5232-03 KNOB (ENC)

A 2B N14-0569-04 CIRCULAR NUT (VOL,ENC)

Destination

L : Scandinavia K : USA P : Canada Y : PX (Far East, Hawaii) T : England E : Europe Y : AAFES (Europe) X: Australia M: Other Areas

Address

New

Parts No. Description

parts

PAN HEAD SEMS SCREW W (P-MODULE) PAN HEAD TAPTITE SCREW (TERMINAL)

VARIABLE RESISTOR (POWER SW/VOL)

Ref. No.

B 3B N30-2605-46 PAN HEAD MACHINE SCREW (ANT) C 3A N30-2610-46 PAN HEAD MACHINE SCREW (CASE) D 2A N67-2606-46

F3A✽ N79-2025-46 E 2A,1B N83-2005-46 PAN HEAD TAPTITE SCREW (UNIT)

42 2C N99-2004-05 SCREW SET ACSY

44 3B R31-0617-05

S300 - S70-0414-05 TACT SWITCH

46 1A T07-0714-05 SPEAKER 47 2C ✽ T90-0636-25 WHIP ANTENNA (800MHZ) ACSY A-K,K2 47 2C ✽ T90-0640-25 WHIP ANTENNA (900MHZ) ACSY B-K,K2 MIC300 1A T91-0579-05 MIC ELEMENT

49 2B W02-1814-05 ENCODER 50 1D ✽ W09-0900-35 BATTERY ASSY ACSY

DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2

D301 B30-2019-05 LED (RE/GR) (BUSY/TX) D305-310 B30-2171-05 LED (BACKLIGHT) A,B-K2 D305,306 B30-2171-05 LED (BACKLIGHT)

C301 CC73GCH1H470J CHIP C 47PF J C302 C92-0560-05 CHIP-TAN 10UF 6.3WV C304 CK73FB1C474K CHIP C 0.47UF K C305 CC73GCH1H101J CHIP C 100PF J C307 CK73GB1C104K CHIP C 0.10UF K

C308 CC73GCH1H101J CHIP C 100PF J C309 CK73FB1C474K CHIP C 0.47UF K C310 CK73GB1C104K CHIP C 0.10UF K C311 CC73GCH1H470J CHIP C 47PF J C312 CK73GB1C104K CHIP C 0.10UF K

C313 C92-0628-05 CHIP-TAN 10UF 10WV C314 C92-0647-05 CHIP-TAN 3.3UF 4WV C315 CC73GCH1H101J CHIP C 100PF J C316,317 CC73GCH1H470J CHIP C 47PF J C318 CC73GCH1H101J CHIP C 100PF J

C321-333 CC73GCH1H470J CHIP C 47PF J C335-339 CC73GCH1H470J CHIP C 47PF J C340 CK73GB1E153K CHIP C 0.015UF K C341-344 CC73GCH1H470J CHIP C 47PF J

CN300 E40-5891-05 FLAT CABLE CONNECTOR (24P) CN301 E40-5892-05 FLAT CABLE CONNECTOR (14P) CN302 E40-5662-05 PIN ASSY SOCKET (SP) CN303 E40-5887-05 PIN ASSY (PTT) CN304 E40-5823-05 FLAT CABLE CONNECTOR (LCD)

L300,301 L92-0141-05 FERRITE CHIP L302,303 L92-0138-05 FERRITE CHIP L304,305 L92-0141-05 FERRITE CHIP L306,307 L92-0138-05 FERRITE CHIP L308,309 L92-0141-05 FERRITE CHIP

CP300,301 R90-0723-05 MULTI-COMP 47K X2 CP302 R90-0724-05 MULTI-COMP 1K X4 A,B-K2 CP303 R90-0724-05 MULTI-COMP 1K X4

Desti-

nation

A : TK-480 (K,K2) B : TK-481 (K,K2)

PARTS LIST

Address

New

parts

Parts No. Description Ref. No.

Ref. No.

R300 RK73GB1J103J CHIP R 10K J 1/16W R301 RK73FB2A101J CHIP R 100 J 1/10W R302 RK73GB1J470J CHIP R 47 J 1/16W R303 RK73GB1J471J CHIP R 470 J 1/16W R304 RK73GB1J182J CHIP R 1.8K J 1/16W

R305 RK73GB1J104J CHIP R 100K J 1/16W R306 R92-1252-05 CHIP R 0 OHM R307 RK73GB1J821J CHIP R 820 J 1/16W R308 RK73GB1J153J CHIP R 15K J 1/16W R309 R92-1252-05 CHIP R 0 OHM

R310 RK73GB1J331J CHIP R 330 J 1/16W R311 RK73GB1J102J CHIP R 1.0K J 1/16W R312 RK73GB1J104J CHIP R 100K J 1/16W R313,314 RK73GB1J102J CHIP R 1.0K J 1/16W R315 RK73GB1J104J CHIP R 100K J 1/16W

R316 RK73GB1J473J CHIP R 47K J 1/16W R317 RK73GB1J472J CHIP R 4.7K J 1/16W R318 RK73GB1J104J CHIP R 100K J 1/16W R319 RK73GB1J820J CHIP R 82 J 1/16W R320,321 RK73GB1J820J CHIP R 82 J 1/16W A,B-K2

R324 RK73GB1J102J CHIP R 1.0K J 1/16W R325 RK73GB1J102J CHIP R 1.0K J 1/16W A,B-K2 R326 RK73GB1J124J CHIP R 120K J 1/16W R327 RK73GB1J563J CHIP R 56K J 1/16W R328 RK73GB1J124J CHIP R 120K J 1/16W

R331 RK73GB1J103J CHIP R 10K J 1/16W R332 RK73GB1J272J CHIP R 2.7K J 1/16W R333 RK73GB1J103J CHIP R 10K J 1/16W R336 R92-1252-05 CHIP R 0 OHM R337 RK73GB1J472J CHIP R 4.7K J 1/16W

R338-341 RK73GB1J101J CHIP R 100 J 1/16W

Destination

TK-480/48 1

DISPLAY UNIT (X54-3210-XX) TX-RX UNIT (X57-5630-XX)

New

Address

Parts No. Description

parts

TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481

C1,2 CK73GB1E103K CHIP C 0.010UF K C3,4 CC73GCH1H101J CHIP C 100PF J C5 CK73GB1E103K CHIP C 0.010UF K C6 C92-0507-05 CHIP-TAN 4.7UF 6.3WV C7 CC73GCH1H101J CHIP C 100PF J

C8 CK73GB1E223K CHIP C 0.022UF K C9 CK73GB1C104K CHIP C 0.10UF K C10 C92-0507-05 CHIP-TAN 4.7UF 6.3WV C11 CK73GB1C104K CHIP C 0.10UF K C12,13 C92-0507-05 CHIP-TAN 4.7UF 6.3WV

C14 C92-0576-05 CHIP-TAN 1.0UF 6.3WV C15 CC73GCH1H100D CHIP C 10PF D C16,17 CC73GCH1H101J CHIP C 100PF J C18 CK73GB1C104K CHIP C 0.10UF K C19-23 CC73GCH1H101J CHIP C 100PF J

C24 C92-0507-05 CHIP-TAN 4.7UF 6.3WV C25 CK73FB1A105K CHIP C 1.0UF K C26 CK73GB1E123K CHIP C 0.012UF K C27 CK73GB1C104K CHIP C 0.10UF K C28-30 CC73GCH1H101J CHIP C 100PF J

C31 CK73GB1C104K CHIP C 0.10UF K C32 CK73GB1H472K CHIP C 4700PF K C33 CK73GB1H471K CHIP C 470PF K C34 C92-0560-05 CHIP-TAN 10UF 6.3WV C35 CK73GB1C333K CHIP C 0.033UF K

C36 CC73GCH1H820J CHIP C 82PF J C37 C92-0560-05 CHIP-TAN 10UF 6.3WV C38 CC73GCH1H101J CHIP C 100PF J C39 CC73GCH1H221J CHIP C 220PF J C40 CC73GCH1H101J CHIP C 100PF J

Destination

S301-303 S70-0457-05 TACT SWITCH (PTT)

D300 NNCD6.8G ZENER DIODE D302 1SS373 DIODE D303 015AZ2.4-X ZENER DIODE D304 MA2S111 DIODE D315 IMN10 DIODE A,B-K2

D316 MA2S111 DIODE A,B-K2 D317 MA2S111 DIODE D318 IMN10 DIODE D319-321 015AZ6.8 ZENER DIODE IC300 TDA7053AT IC (AUDIO AMP)

IC301 ✽ TC74HC4017AF IC (COUNTER) Q300 2SJ243 FET Q301 UPA672T FET Q302-304 2SC4617(S) TRANSISTOR Q305 2SB798(DL,DK) TRANSISTOR

Q306 2SC4617(S) TRANSISTOR Q307 2SB1132(Q,R) TRANSISTOR Q308 UPA672T FET Q309 2SC4617(S) TRANSISTOR Q310 2SK1824 FET

TH300 TN10-3S154JT THERMISTOR

A : TK-480 (K,K2) B : TK-481 (K,K2)

C41 CK73FB1C334K CHIP C 0.33UF K C42 CK73GB1E103K CHIP C 0.010UF K C43 C92-0513-05 CHIP-TAN 3.3UF 6.3WV C44 C92-0662-05 CHIP-TAN 15UF 6.3WV C45 CC73GCH1H220J CHIP C 22PF J

C46 CC73GCH1H221J CHIP C 220PF J C47 CK73GB1E223K CHIP C 0.022UF K C48 CC73GCH1H220J CHIP C 22PF J C49,50 CK73GB1H102K CHIP C 1000PF K C51 CK73GB1E223K CHIP C 0.022UF K

C52-54 CK73GB1H102K CHIP C 1000PF K C55 CC73GCH1H150J CHIP C 15PF J C56 CK73GB1H222K CHIP C 2200PF K C57 CK73GB1E153K CHIP C 0.015UF K C58 CK73GB1C104K CHIP C 0.10UF K

C59 CC73GCH1H101J CHIP C 100PF J C60 CC73GCH1H100D CHIP C 10PF D C61 CC73GCH1H040C CHIP C 4.0PF C B-K,K2 C62 CK73GB1E103K CHIP C 0.010UF K C63 CC73GCH1H101J CHIP C 100PF J

C64 CC73GCH1H271J CHIP C 270PF J C65 CK73GB1H103K CHIP C 0.010UF K C66 CK73GB1C104K CHIP C 0.10UF K C67 CK73GB1H122J CHIP C 1200PF J C68 CC73GCH1H040C CHIP C 4.0PF C B-K,K2

C69 C92-0559-05 CHIP-TAN 6.8UF 6.3WV C70-72 CK73GB1E103K CHIP C 0.010UF K C73 CC73GCH1H101J CHIP C 100PF J

TK-480/48 1

TX-RX UNIT (X57-5630-XX)

Ref. No.

C74 CK73GB1C104K CHIP C 0.10UF K C75 CK73GB1C333K CHIP C 0.033UF K C76 CK73GB1C104K CHIP C 0.10UF K C77 CK73GB1H562J CHIP C 5600PF J C78 CK73GB1E103K CHIP C 0.010UF K

Address

New

Parts No. Description Ref. No.

parts

PARTS LIST

Destination

C137 CC73GCH1H101J CHIP C 100PF J C138 CK73GB1E103K CHIP C 0.010UF K C139 CC73GCH1H030C CHIP C 3.0PF C A-K,K2 C139 CC73GCH1H020C CHIP C 2.0PF C B-K,K2 C140 CK73FB1A105K CHIP C 1.0UF K

Address

New

Parts No. Description

parts

Destination

C79 CC73GCH1H121J CHIP C 120PF J C80 CK73GB1C683K CHIP C 0.068UF K C81 CC73GCH1H101J CHIP C 100PF J C82,83 CK73GB1H562J CHIP C 5600PF J C84 CC73GCH1H150J CHIP C 15PF J

C85 CK73GB1H272J CHIP C 2700PF J C86 CK73GB1C333K CHIP C 0.033UF K C87 CC73GCH1H030C CHIP C 3.0PF C C88 CC73GCH1H101J CHIP C 100PF J C89,90 CK73GB1H272J CHIP C 2700PF J

C91 CK73GB1E103K CHIP C 0.010UF K C92 CK73GB1C104K CHIP C 0.10UF K C93 CC73GCH1H151J CHIP C 150PF J C94 CC73GCH1H101J CHIP C 100PF J C95 C92-0504-05 CHIP-TAN 0.68UF 20WV A-K,K2

C95 C92-0003-05 CHIP-TAN 0.47UF 25WV B-K,K2 C96 CK73GB1H122K CHIP C 1200PF K A-K,K2 C96 CK73GB1H102K CHIP C 1000PF K B-K,K2 C97 CK73GB1H102K CHIP C 1000PF K C98 CC73GCH1H030C CHIP C 3.0PF C

C99 CC73GCH1H1R5B CHIP C 1.5PF B C100 CC73GCH1H391J CHIP C 390PF J A-K,K2 C100 CK73GB1H821K CHIP C 820PF K B-K,K2 C101 C92-0560-05 CHIP-TAN 10UF 6.3WV C102 CK73GB1C104K CHIP C 0.10UF K

C103,104 CC73GCH1H101J CHIP C 100PF J C105 CK73GB1C473K CHIP C 0.047UF K C106-108 CK73GB1C104K CHIP C 0.10UF K C109 C92-0507-05 CHIP-TAN 4.7UF 6.3WV C110 CC73GCH1H1R5B CHIP C 1.5PF B

C141 CK73GB1H472K CHIP C 4700PF K C142,143 CC73GCH1H101J CHIP C 100PF J C144 CK73GB1C273K CHIP C 0.027UF K C145,146 CC73GCH1H101J CHIP C 100PF J C147,148 CK73HB1C103K CHIP C 0.010UF K

C149 CC73GCH1H040C CHIP C 4.0PF C C150,151 CC73GCH1H101J CHIP C 100PF J C152 CC73GCH1H020C CHIP C 2.0PF C C153 CC73GCH1H101J CHIP C 100PF J C154 CK73GB1C104K CHIP C 0.10UF K

C155 CC73GCH1H101J CHIP C 100PF J C156 C92-0507-05 CHIP-TAN 4.7UF 6.3WV C157 CC73GCH1H680J CHIP C 68PF J C158 CC73GCH1H270J CHIP C 27PF J C159 CK73FB1H563K CHIP C 0.056UF K

C160,161 CC73GCH1H101J CHIP C 100PF J C162 CC73GCH1H270J CHIP C 27PF J C163 CK73FB1C474K CHIP C 0.47UF K C164,165 CC73GCH1H101J CHIP C 100PF J C166 CC73GCH1H010C CHIP C 1.0PF C A-K,K2

C166 CC73GCH1HR75C CHIP C 0.75PF C B-K,K2 C167 CC73GCH1H101J CHIP C 100PF J C168 CC73GCH1H020C CHIP C 2.0PF C C169-172 CC73GCH1H101J CHIP C 100PF J C173 CC73GCH1H020C CHIP C 2.0PF C

C174 CC73GCH1H1R5C CHIP C 1.5PF C C175 CC73GCH1H030C CHIP C 3.0PF C C176 CC73GCH1H010C CHIP C 1.0PF C A-K,K2 C176 CC73GCH1HR75C CHIP C 0.75PF C B-K,K2 C177 CK73GB1C473K CHIP C 0.047UF K

C111,112 CK73GB1C104K CHIP C 0.10UF K C113 CK73GB1C473K CHIP C 0.047UF K C114,115 CK73GB1H472K CHIP C 4700PF K A-K,K2 C114,115 CK73GB1H332K CHIP C 3300PF K B-K,K2 C116 CK73GB1H102K CHIP C 1000PF K

C117 CC73GCH1H470J CHIP C 47PF J C118 CK73GB1E103K CHIP C 0.010UF K C119 CC73GCH1HR75C CHIP C 0.75PF C C120 CC73GCH1H101J CHIP C 100PF J C121 CK73GB1E153K CHIP C 0.015UF K

C122 CC73GCH1H1R5C CHIP C 1.5PF C A-K,K2 C122 CC73GCH1H030C CHIP C 3.0PF C B-K,K2 C123 C92-0507-05 CHIP-TAN 4.7UF 6.3WV C124 CK73GB1E103K CHIP C 0.010UF K C125 CK73GB1H102K CHIP C 1000PF K

C126 CK73GB1C104K CHIP C 0.10UF K C127-129 CC73GCH1H101J CHIP C 100PF J C130 CC73GCH1H100D CHIP C 10PF D C131 CC73GCH1H101J CHIP C 100PF J C132 CC73GCH1H010C CHIP C 1.0PF C A-K,K2

C132 CC73GCH1HR75C CHIP C 0.75PF C B-K,K2 C133 CC73GCH1H101J CHIP C 100PF J C134 CC73GCH1H010B CHIP C 1.0PF B A-K,K2 C135 CC73GCH1H101J CHIP C 100PF J C136 CC73GCH1H030C CHIP C 3.0PF C

C178-180 CC73GCH1H101J CHIP C 100PF J C181,182 CK73GB1E103K CHIP C 0.010UF K C183 CC73GCH1H101J CHIP C 100PF J C184 CC73GCH1H030C CHIP C 3.0PF C C185 CC73GCH1H101J CHIP C 100PF J

C186 CC73GCH1H1R5C CHIP C 1.5PF C C187 CC73GCH1H101J CHIP C 100PF J C188-191 CC73GCH1H470J CHIP C 47PF J C192 CC73GCH1H101J CHIP C 100PF J C193 CC73GCH1H020C CHIP C 2.0PF C A-K,K2

C193 CC73GCH1H1R5C CHIP C 1.5PF C B-K,K2 C194-199 CC73GCH1H101J CHIP C 100PF J C200 CK73GB1E103K CHIP C 0.010UF K C201 CC73GCH1H470J CHIP C 47PF J C202 CK73GB1E103K CHIP C 0.010UF K

C203 CC73GCH1H470J CHIP C 47PF J C204 C92-0003-05 CHIP-TAN 0.47UF 25WV C205,206 CK73HB1C103K CHIP C 0.010UF K C207 CK73GB1C104K CHIP C 0.10UF K C208,209 CC73GCH1H101J CHIP C 100PF J

C261,262 CK73HB1C103K CHIP C 0.010UF K C263 C92-0628-05 CHIP-TAN 10UF 10WV

CN1 E40-5823-05 FLAT CABLE CONNECTOR (10P) CN2 E40-9517-05 PIN ASSY SOCKET (4P)

A : TK-480 (K,K2) B : TK-481 (K,K2)

PARTS LIST

Address

New

parts

Parts No. Description Ref. No.

CRYSTAL RESONATOR (3.579545MHZ)

Ref. No.

CN3 E40-5890-05 FLAT CABLE CONNECTOR (24P) CN4-9 E23-1002-05 TERMINAL CN10 E23-0342-05 TEST TERMINAL CN11,12 E23-1002-05 TERMINAL

F1 F53-0130-05 FUSE (3A) F1 F53-0217-05 FUSE (3A)

CD1 L79-1072-05 TUNING COIL CF1,2 L72-0924-05 CERAMIC FILTER (455KHZ) A-K,K2 CF1,2 L72-0939-05 CERAMIC FILTER (455KHZ) B-K,K2 L1 L92-0149-05 FERRITE CHIP L3 L40-1095-34 SMALL FIXED INDUCTOR (1UH)

L4 L40-4791-37 SMALL FIXED INDUCTOR (4.700UH) L5 L92-0138-05 FERRITE CHIP L6,7 L40-3985-45 SMALL FIXED INDUCTOR (0.39UH) L8 L92-0138-05 FERRITE CHIP L9 L40-1075-92 SMALL FIXED INDUCTOR (10NH) A-K,K2

L9 L40-6865-92 SMALL FIXED INDUCTOR (6.8NH) B-K,K2 L10 L40-8265-92 SMALL FIXED INDUCTOR (8.2NH) A-K,K2 L10 L40-6865-92 SMALL FIXED INDUCTOR (6.8NH) B-K,K2 L11 L79-1464-05 DIELECTRIC FILTER (860MHZ) A-K,K2 L11 L79-1466-05 DIELECTRIC FILTER (938MHZ) B-K,K2

L12 L92-0138-05 FERRITE CHIP L13,14 L40-1075-92 SMALL FIXED INDUCTOR (10NH) L15 L40-5663-92 SMALL FIXED INDUCTOR (5.6NH) A-K,K2 L15 L40-2763-92 SMALL FIXED INDUCTOR (2.7NH) B-K,K2 L16 L92-0138-05 FERRITE CHIP

L17 L40-1075-92 SMALL FIXED INDUCTOR (10NH) A-K,K2 L17 L40-8265-92 SMALL FIXED INDUCTOR (8.2NH) B-K,K2 L18 L40-2275-92 SMALL FIXED INDUCTOR (22NH) A-K,K2 L18 L40-6865-92 SMALL FIXED INDUCTOR (6.8NH) B-K,K2 L19 L40-1075-92 SMALL FIXED INDUCTOR (10NH) A-K,K2

L19 L40-1275-92 SMALL FIXED INDUCTOR (12NH) B-K,K2 L20 L79-1465-05 DIELECTRIC FILTER (860MHZ) A-K,K2 L20 L79-1467-05 DIELECTRIC FILTER (938MHZ) B-K,K2 L21 L40-6865-92 SMALL FIXED INDUCTOR (6.8NH) A-K,K2 L21 L40-5663-92 SMALL FIXED INDUCTOR (5.6NH) B-K,K2

L22,23 L92-0138-05 FERRITE CHIP L24 L40-6865-92 SMALL FIXED INDUCTOR (6.8NH) A-K,K2 L24 L40-5663-92 SMALL FIXED INDUCTOR (5.6NH) B-K,K2 L25 L92-0149-05 FERRITE CHIP L26 L92-0138-05 FERRITE CHIP

L27 L40-6875-54 SMALL FIXED INDUCTOR (68NH) L28 L33-0761-05 SMALL FIXED INDUCTOR L29 L40-1075-92 SMALL FIXED INDUCTOR (10NH) L30 L79-1468-05 FILTER MODULE (870MHZ) A-K,K2 L30 L79-1469-05 FILTER MODULE (960MHZ) B-K,K2

L31 L33-0760-05 SMALL FIXED INDUCTOR L32 L40-6875-54 SMALL FIXED INDUCTOR (68NH) L34 L40-8265-92 SMALL FIXED INDUCTOR (8.2NH) A-K,K2 L34 L40-1075-92 SMALL FIXED INDUCTOR (10NH) B-K,K2 L35 L92-0138-05 FERRITE CHIP

L53-56 L92-0138-05 FERRITE CHIP X1 L77-1760-15 CRYSTAL RESONATOR (44.395MHZ) X2 L77-1699-15 VCXO (16.8MHZ) X3 L77-1708-05 X4 L78-0462-05 RESONATOR (9.8304MHZ)

XF1 L71-0501-05 MCF (44.85MHZ) A-K,K2 XF1 L71-0502-05 MCF (44.85MHZ) B-K,K2

A : TK-480 (K,K2) B : TK-481 (K,K2)

Destination

TK-480/48 1

TX-RX UNIT (X57-5630-XX)

New

Address

CP1 R90-0718-05 MULTI-COMP 4.7K X4 CP3 R90-0743-05 MULTIPLE RESISTOR CP5 R90-0743-05 MULTIPLE RESISTOR CP6-21 R90-0741-05 MULTIPLE RESISTOR CP22 R90-0743-05 MULTIPLE RESISTOR

CP24 R90-0743-05 MULTIPLE RESISTOR R1,2 RK73GB1J104J CHIP R 100K J 1/16W R3 RK73GB1J473J CHIP R 47K J 1/16W R4 RK73GB1J154J CHIP R 150K J 1/16W R5 RK73GB1J104J CHIP R 100K J 1/16W

R6 RK73GB1J184J CHIP R 180K J 1/16W R7 RK73GB1J104J CHIP R 100K J 1/16W R8 RK73GB1J183J CHIP R 18K J 1/16W A-K,K2 R8 RK73GB1J273J CHIP R 27K J 1/16W B-K,K2 R9 RK73GB1J154J CHIP R 150K J 1/16W

R10 RK73GB1J103J CHIP R 10K J 1/16W R11 RK73GB1J473J CHIP R 47K J 1/16W A-K,K2 R11 RK73GB1J223J CHIP R 22K J 1/16W B-K,K2 R12 RK73GB1J104J CHIP R 100K J 1/16W R13 RK73GB1J683J CHIP R 68K J 1/16W

R14 RK73GB1J394J CHIP R 390K J 1/16W R15 RK73GB1J472J CHIP R 4.7K J 1/16W R16 RK73GB1J104J CHIP R 100K J 1/16W R17 RK73GB1J473J CHIP R 47K J 1/16W R18 RK73GB1J332J CHIP R 3.3K J 1/16W

R19 RK73GB1J152J CHIP R 1.5K J 1/16W R20 RK73GB1J683J CHIP R 68K J 1/16W R21 RK73GB1J154J CHIP R 150K J 1/16W R22 RK73GB1J182J CHIP R 1.8K J 1/16W R23 RK73GB1J563J CHIP R 56K J 1/16W A-K,K2

R23 RK73GB1J124J CHIP R 120K J 1/16W B-K,K2 R24 RK73GB1J274J CHIP R 270K J 1/16W R25 RK73GB1J473J CHIP R 47K J 1/16W R26 RK73GB1J332J CHIP R 3.3K J 1/16W R27 RK73GB1J222J CHIP R 2.2K J 1/16W

R28 RK73GB1J220J CHIP R 22 J 1/16W R29 RK73GB1J183J CHIP R 18K J 1/16W A-K,K2 R29 RK73GB1J123J CHIP R 12K J 1/16W B-K,K2 R31 RK73GB1J472J CHIP R 4.7K J 1/16W R32 R92-1252-05 CHIP R 0 OHM

R33 RK73GB1J123J CHIP R 12K J 1/16W R34 RK73GB1J334J CHIP R 330K J 1/16W R35 RK73GB1J101J CHIP R 100 J 1/16W R36 RK73GB1J472J CHIP R 4.7K J 1/16W R37 RK73GB1J104J CHIP R 100K J 1/16W

R38 RK73GB1J151J CHIP R 150 J 1/16W R39 RK73GB1J560J CHIP R 56 J 1/16W R40 RK73GB1J272J CHIP R 2.7K J 1/16W R41 RK73GB1J471J CHIP R 470 J 1/16W R42,43 RK73GB1J102J CHIP R 1.0K J 1/16W

R44 R92-0670-05 CHIP R 0 OHM R45 RN73GH1J913D CHIP R 91K D 1/16W R46 RN73GH1J683D CHIP R 68K D 1/16W R47 RN73GH1J913D CHIP R 91K D 1/16W R48 RN73GH1J333D CHIP R 33K D 1/16W

R49 RK73GB1J684J CHIP R 680K J 1/16W R50 RK73GB1J564J CHIP R 560K J 1/16W R51 RK73GB1J331J CHIP R 330 J 1/16W R53 RN73GH1J274D CHIP R 270K D 1/16W R54 RK73GB1J334J CHIP R 330K J 1/16W

Parts No. Description

parts

Destination

TK-480/48 1

TX-RX UNIT (X57-5630-XX)

Ref. No.

R55 RN73GH1J913D CHIP R 91K D 1/16W R56 RK73GB1J223J CHIP R 22K J 1/16W R57 RK73GB1J334J CHIP R 330K J 1/16W R58 RN73GH1J682D CHIP R 6.8K D 1/16W R59 RK73GB1J154J CHIP R 150K J 1/16W

Address

New

Parts No. Description Ref. No.

parts

PARTS LIST

Destination

R112 RK73GB1J103J CHIP R 10K J 1/16W R113 RK73GB1J101J CHIP R 100 J 1/16W A-K,K2 R113 RK73GB1J220J CHIP R 22 J 1/16W B-K,K2 R114 RK73GB1J152J CHIP R 1.5K J 1/16W R115 RK73GB1J681J CHIP R 680 J 1/16W

Address

New

Parts No. Description

parts

Destination

R60 RK73GB1J101J CHIP R 100 J 1/16W R61 RK73GB1J155J CHIP R 1.5M J 1/16W R62 RK73GB1J101J CHIP R 100 J 1/16W R63 RN73GH1J683D CHIP R 68K D 1/16W R64 RK73GB1J474J CHIP R 470K J 1/16W

R65 RK73GB1J560J CHIP R 56 J 1/16W R66 RN73GH1J682D CHIP R 6.8K D 1/16W R67,68 RK73GB1J101J CHIP R 100 J 1/16W R69 RK73GB1J153J CHIP R 15K J 1/16W A-K,K2 R69 RK73GB1J223J CHIP R 22K J 1/16W B-K,K2

R70 RK73GB1J153J CHIP R 15K J 1/16W R71 RK73GB1J224J CHIP R 220K J 1/16W R72 RK73GB1J152J CHIP R 1.5K J 1/16W A-K,K2 R72 RK73GB1J222J CHIP R 2.2K J 1/16W B-K,K2 R73 RK73GB1J103J CHIP R 10K J 1/16W

R74 RK73GB1J223J CHIP R 22K J 1/16W R75 RK73GB1J152J CHIP R 1.5K J 1/16W R76 RK73GB1J103J CHIP R 10K J 1/16W R77 RK73GB1J153J CHIP R 15K J 1/16W R78 RK73GB1J102J CHIP R 1.0K J 1/16W

R79 RK73GB1J473J CHIP R 47K J 1/16W R80 RK73GB1J394J CHIP R 390K J 1/16W A-K,K2 R80 RK73GB1J684J CHIP R 680K J 1/16W B-K,K2 R81 RK73GB1J102J CHIP R 1.0K J 1/16W R82 RK73GB1J333J CHIP R 33K J 1/16W A-K,K2

R82 RK73GB1J393J CHIP R 39K J 1/16W B-K,K2 R83 R92-1252-05 CHIP R 0 OHM R84 RK73GB1J473J CHIP R 47K J 1/16W R85 RK73GB1J681J CHIP R 680 J 1/16W R86 RK73GB1J154J CHIP R 150K J 1/16W

R116 R92-1368-05 CHIP R 0 OHM R117 RK73GB1J470J CHIP R 47 J 1/16W R118 R92-1252-05 CHIP R 0 OHM R120 RK73HB1J102J CHIP R 1.0K J 1/16W R121 RK73GB1J473J CHIP R 47K J 1/16W

R122 R92-1252-05 CHIP R 0 OHM R123 RK73HB1J102J CHIP R 1.0K J 1/16W R124,125 RK73HB1J473J CHIP R 47K J 1/16W R126 RK73GB1J103J CHIP R 10K J 1/16W R127-129 RK73EB2ER39K CHIP R 0.39 K 1/4W

R130-135 RN73GH1J154D CHIP R 150K D 1/16W R136,137 RK73GB1J271J CHIP R 270 J 1/16W R138 RK73HB1J103J CHIP R 10K J 1/16W R139 R92-1368-05 CHIP R 0 OHM R140 RK73GB1J103J CHIP R 10K J 1/16W

R141,142 RK73GB1J104J CHIP R 100K J 1/16W R143 RK73GB1J105J CHIP R 1.0M J 1/16W R144 RK73GB1J473J CHIP R 47K J 1/16W R145 R92-1252-05 CHIP R 0 OHM R146 RK73GB1J222J CHIP R 2.2K J 1/16W

R147 R92-1252-05 CHIP R 0 OHM R148 RK73GB1J223J CHIP R 22K J 1/16W R149 RK73HB1J473J CHIP R 47K J 1/16W R150 RK73HB1J102J CHIP R 1.0K J 1/16W R151 RK73GB1J102J CHIP R 1.0K J 1/16W

R152 RK73GB1J332J CHIP R 3.3K J 1/16W R153 RK73GB1J123J CHIP R 12K J 1/16W R154 RK73GB1J221J CHIP R 220 J 1/16W R155 RK73GB1J101J CHIP R 100 J 1/16W R156 RK73GB1J103J CHIP R 10K J 1/16W

R87 RK73GB1J470J CHIP R 47 J 1/16W R88 RK73GB1J220J CHIP R 22 J 1/16W R89 RK73GB1J103J CHIP R 10K J 1/16W R90 RK73GB1J104J CHIP R 100K J 1/16W R91 RK73GB1J100J CHIP R 10 J 1/16W

R92,93 RK73GB1J150J CHIP R 15 J 1/16W R94 RK73GB1J272J CHIP R 2.7K J 1/16W R95 RK73GB1J150J CHIP R 15 J 1/16W R96 RK73GB1J223J CHIP R 22K J 1/16W R97 RK73GB1J104J CHIP R 100K J 1/16W

R98 RK73GB1J184J CHIP R 180K J 1/16W R99 RK73GB1J121J CHIP R 120 J 1/16W A-K,K2 R100 RK73GB1J820J CHIP R 82 J 1/16W A-K,K2 R100 RK73GB1J221J CHIP R 220 J 1/16W B-K,K2 R101 RK73GB1J223J CHIP R 22K J 1/16W

R102 RK73GB1J182J CHIP R 1.8K J 1/16W R103 RK73GB1J102J CHIP R 1.0K J 1/16W R104 RK73HB1J102J CHIP R 1.0K J 1/16W R105 RK73GB1J122J CHIP R 1.2K J 1/16W R106 RK73GB1J473J CHIP R 47K J 1/16W

R107 RK73GB1J103J CHIP R 10K J 1/16W R108 RK73GB1J682J CHIP R 6.8K J 1/16W R109 RK73GB1J470J CHIP R 47 J 1/16W R110 RK73GB1J473J CHIP R 47K J 1/16W R111 RK73GB1J223J CHIP R 22K J 1/16W

R157 RK73GB1J102J CHIP R 1.0K J 1/16W R158 RK73GB1J223J CHIP R 22K J 1/16W R159,160 RK73GB1J102J CHIP R 1.0K J 1/16W R161,162 RK73GB1J184J CHIP R 180K J 1/16W R163 RK73GB1J104J CHIP R 100K J 1/16W

R164 RK73GB1J473J CHIP R 47K J 1/16W R165 RK73GB1J150J CHIP R 15 J 1/16W A-K,K2 R165 R92-1252-05 CHIP R 0 OHM B-K,K2 R166 RK73GB1J103J CHIP R 10K J 1/16W B-K,K2 R167 RK73GB1J123J CHIP R 12K J 1/16W

R168 RK73GB1J333J CHIP R 33K J 1/16W R169 RK73GB1J223J CHIP R 22K J 1/16W R170 RK73GB1J473J CHIP R 47K J 1/16W R171 RK73GB1J823J CHIP R 82K J 1/16W R200-207 RK73HB1J102J CHIP R 1.0K J 1/16W

R211 RK73HB1J103J CHIP R 10K J 1/16W R218 RK73HB1J473J CHIP R 47K J 1/16W R248 R92-1252-05 CHIP R 0 OHM R250 R92-1252-05 CHIP R 0 OHM R259 R92-1252-05 CHIP R 0 OHM

R276 R92-1252-05 CHIP R 0 OHM R297,298 RK73HB1J473J CHIP R 47K J 1/16W R408 RK73HB1J473J CHIP R 47K J 1/16W R417 RK73GB1J474J CHIP R 470K J 1/16W R418 RK73GB1J104J CHIP R 100K J 1/16W

A : TK-480 (K,K2) B : TK-481 (K,K2)

PARTS LIST

Address

New

parts

Parts No. Description Ref. No.

Ref. No.

R419-422 R92-1252-05 CHIP R 0 OHM R423 RK73GB1J473J CHIP R 47K J 1/16W

D1 1SR154-400 DIODE D2 MA2S111 DIODE D3 MA742 DIODE D4,5 MA2S077 DIODE D6 ✽ UDZS4.7B ZENER DIODE

D7 HVU131 DIODE D8 MA2S111 DIODE D9,10 MA2S077 DIODE D11 MA742 DIODE D12 MA2S111 DIODE B-K,K2

D17,18 DA221 DIODE IC1 TA75W01FU IC (BUFFER AMP) IC2 RN5VL42C IC (VOLTAGE DETECTOR/RESET) IC3 TC75W51FU IC (SUMMING AMP) IC4 M62364FP IC (D/A CONVERTER)

IC5 S-81350HG-KD IC (VOLTAGE REGULATOR/5M) IC6 NJU7201U50 IC (VOLTAGE REGULATOR/5V) IC7 TK11250BM IC (VOLTAGE REGULATOR/5C) IC8 TC75W51FU IC (BUFFER AMP) IC9 TA31136FN IC (FM IF SYSTEM)

Destination

Address

TK-480/48 1

New

Parts No. Description

parts

TX-RX UNIT (X57-5630-XX)

Destination

IC10 TA75W01FU IC (ACTIVE FILTER) IC11 SA7025DK IC (PLL SYSTEM) IC12 TC35453F IC (AUDIO PROCESSOR) IC13 LC73872M IC (DTMF DECODER) IC14 KCH31 HIC (VCO SYSTEM) A-K,K2

IC14 KCH32 HIC (VCO SYSTEM) B-K,K2 IC15 ✽ 30622M8A-4F9GP IC (MICROPROCESSOR) IC16 AT2408N10SI2.5 IC (EEPROM) IC17 AT29C020-90TI IC (AND GATE) IC17 ✽ W29C020C90 IC (AND GATE)

IC18,19 BU4094BCFV IC (SHIFT REGISTER) IC21 NJM2904V IC (COMPARATOR) IC23 TA75S01F IC (ACTIVE FILTER) IC30 M68757L IC (POWER MODULE) A-K,K2 IC30 M68757H IC (POWER MODULE) B-K,K2

Q1 2SJ243 FET Q2 2SA1832(GR) TRANSISTOR Q3,4 2SC4617(S) TRANSISTOR Q5 2SC4619 TRANSISTOR A-K,K2 Q5 2SC5108(Y) TRANSISTOR B-K,K2

Q6 ✽ 3SK318 FET Q7 2SK1824 FET Q8 2SC5108(Y) TRANSISTOR Q9 3SK274 FET Q10,11 2SC5108(Y) TRANSISTOR

Q12 2SC4988 TRANSISTOR Q13 2SK1824 FET Q14 DTC114EE DIGITAL TRANSISTOR Q15 DTA144EE DIGITAL TRANSISTOR Q16 DTC114EE DIGITAL TRANSISTOR

Q17 2SC5108(Y) TRANSISTOR Q18 2SK1824 FET Q19 2SC4617(S) TRANSISTOR Q20 DTC144EE DIGITAL TRANSISTOR Q21-23 2SK1824 FET

TH2 157-503-65001 THERMISTOR

A : TK-480 (K,K2) B : TK-481 (K,K2)

TK-480/481

EXPLODED VIEW

22x2

21x2

Ex2

MIC300

Ex2

Display unit (A/2)

A : N14-0569-04 B M2.6 x 5 : N30-2605-46 C M2.6 x 10 : N30-2610-46 D M2.6 x 6 : N67-2606-46 E M2 x 5 : N83-2005-46 F M2 x 2.5 : N79-2025-46

When you repair or exchange the display unit, please exchange the sheet (24) as well.

Display unit (B/2)

701 (Chassis)

TX-RX unit

Ex2

703

S/No. label

Bx2

When you repair or exchange the square socket (19), please exchange FPC (34) as well.

Parts with the exploded numbers larger than 700 are not supplied.

PACKING

TK-480/481

7 Warranty card (B46-0470-00)

9 Instruction manual (B62-1483-00)

4 Cap (SP/MIC) (B09-0363-03)

50 Battery assy (W09-0900-35)

Insulation sheet

32 Hook (J29-0658-05)

42 Screw set (N99-2004-05)

28 Packing fixture (H12-3014-02)

47 Whip antenna (T90-0636-25) : TK-480 (T90-0640-25) : TK-481

29 Item carton case (H52-1096-12) : TK-480 (H52-1097-12) : TK-481

TK-480/481

ADJUSTMENT

Test Equipment Required for Alignment

Test Equipment Major Specifications

1. Standard Signal Generator Frequency Range 800 to 950MHz (SSG) Modulation Frequency modulation and external modulation

Output 0.1µV to greater than 1mV

2. Power Meter Input Impedance 50Ω

Operation Frequency 800 to 950MHz or more Measurement Capability Vicinity of 10W

3. Deviation Meter Frequency Range 800 to 950MHz

4. Digital Volt Meter Measuring Range 10mV to 10V DC (DVM) Input Impedance High input impedance for minimum circuit loading

5. Oscilloscope DC through 30MHz

6. High Sensitivity Frequency Range 10Hz to 1000MHz Frequency Counter Frequency Stability 0.2ppm or less

7. Ammeter 5A

8. AF Volt Meter Frequency Range 50Hz to 10kHz (AF VTVM) Voltage Range 1mV to 10V

9. Audio Generator (AG) Frequency Range 50Hz to 5kHz or more

Output 0 to 1V

10. Distortion Meter Capability 3% or less at 1kHz Input Level 50mV to 10Vrms

11. Voltmeter Measuring Range 10mV to 10V DC or less Input Impedance 50kΩ/V or greater

12. 16Ω Dummy Load Approx. 16Ω, 3W

13. Regulated Power Supply 5V to 10V, approx. 5A

Useful if ammeter requipped

■ The following parts are required for adjustment

1. Antenna connector adapter

The antenna connector of this radio uses an SMA termi-

nal.

Use an antenna connector adapter [SMA(f) – BNC(f) or SMA(f) – N(f)] for adjustment. (The adapter is not provided as an option, so buy a commercially-available one.)

Note

When the antenna connector adapter touches the knob, draw out the knob to mount the connector.

2. Universal connector

Use the interface cable (KPG-36) for PC tuning or the lead wire with plug (E30-3287-18) and screw (N08-0535-08) for panel tuning. Connct the plug to the universal connector of the radio and tighten the screw.

The lead wire with plug (E30-3287-18) and screw (N080535-08) terminals are as follows. Numbers are universal connector terminal numbers.

Caution

1. When connecting the plug to the universal connector of the radio, a short circuit may occur. To prevent this, be sure to turn the radio POWER switch off.

2. Since the RX AF output is a BTL output, there is a DC component. Isolate this with a capacitor or transformer as shown in the figure.

3. Do not connct an instrument between red or black and GND.

• Universal connector

1: SSW

3: SP–

5: EMC

7: PTT

9: NC

11: 5M

13: RXD

2: SP+

4: MSW

6: ME

8: PF

10: E

12: TXD

14: NC

ADJUSTMENT

TK-480/481

• Panel tuning

SCREW

TUBE

BLU (7)

BRN (10)

RED (2)

BLK (3)

2: RED (RX AF OUTPUT)

3: BLACK (RX AF OUTPUT)

5: WHITE (MIC INPUT)

6: BROWN (MIC GND) 7: BLUE (PTT SW) GND → ON

8: YELLOW (PF SW)

10: BROWN (GND)

11: GREEN (5M)

PTT SWTo Radio

100µ 10V

16Ω

100µ 10V

WHT (5)

10µ 10V

BRN (6)

AF Voltmeter

Audio generator

Repair Jig (Chassis)

Use jig (part No. : W05-0825-00) for repairing the TK-480/

481.

The jig facilitates the voltage check and protects the module when the voltage on the flow side of the TX-RX unit is checked during repairs.

Battery terminal (+)

Power module

TX-RX unit

Jig

• PC tuning

Connect the wires to the PCB in the connector case of

interface cable.

For output the wires out of the connector case, need to

process the connector case.

KPG-36

Remove the screw

PCB layout

16Ω

Shield

100µ 10 V

10µ 10 V

Connector case

AF voltmeter

Audio generator

How to Remove the Flat Cable

1. Gently draw out both sides of the connector lever uni-

formly in the direction of the arrow with tweezers.

(CN300, CN301)

Tweezers

Flat cable

Lever

2. Gently prise up the connector lever in the direction of the

arrow with a fine regular screwdriver or tweezers.

(CN1, CN3, CN304)

Regular screwdriver

Flat cable

Lever

TK-480/481

ADJUSTMENT

Test Mode

■ Test mode operating features

This transceiver has a test mode.

press [A] key and turn power on. Hold [A] key until test channel No. and test signalling No. appears on LCD.

mode can be inhibited by programming. To exit test mode, switch the power on again. The following functions are available in test mode.

• Controls

Controls “FCN” appears “FCN” not appears

[PTT] Used when making a Used when making

transmission. a transmission.

[AUX] Unused Unused.

[MON] Monitor ON and OFF. Monitor ON and OFF.

[LAMP] Lights the lamp for five Unused.

seconds.

Lighting is extended for

a further five seconds by

pressing any key while

the lamp is lit.

[S] MSK 1200 bps and Sets to the Tuning

2400 bps mode.

[A] Function OFF Function ON.

[B] Compander function RF power HIGH and

ON and OFF. LOW.

[C] Beat shift ON and OFF Changes group.

[0] to [9], Used as the DTMF Used as the DTMF

and [#], keypad. If a key is keypad. If a key is

[*] pressed during trans- pressed during trans-

mission, the DTMF mission, the DTMF

corresponding to the corresponding to the

key that was pressed key that was pressed

is sent. (keypad model) is sent. (keypad model)

[ENCODER]

Changes system. Changes system.

Note : If a [S], [A], [B], [C] key is pressed during transmission, the DTMF corresponding to the key that was pressed is sent.

• LCD indicator

“SCN” Unused “

” Lights at Compander ON. “LO” Lights at RF Power Low. “P” Unused “MON” Lights at moniter ON. “SVC” Unused “

” Lights at MSK 2400 bps.

• LED indicator

Red LED Lights during transmission. Blinks at the

low battery voltage warning.

Green LED Lights when there is a carrier.

To enter test mode,

Test

• Sub LCD indicator

“FCN” Appears at Function ON.

■ Frequency and signalling

The set has been adjusted for the frequencies shown in the following table. When required. re-adjust them following the adjustment procedure to obtain the frequencies you want in actual operation.

Frequency (MHz)

SYS No.

RX (TX : TA) TX RX (TX : TA) TX

1 851.0500 806.0500 935.0250 896.0250

2 851.5500 806.5500 935.0500 896.0500

3 860.0000 815.0000 938.0000 899.0000

4 860.5000 815.5000 938.0250 899.0250

5 865.9875 820.9875 939.9875 900.9875

6 869.4000 824.4000 940.4000 901.4000

7 869.9000 824.9000 940.9000 901.9000

8 855.4000 810.4000 936.2500 897.2500

9 865.6000 820.6000 939.3000 900.3000

10 867.5000 822.5000 936.7500 897.7500

11~16 ––––

TK-480 TK-481

Signalling

Group No. RX TX

1 None None

2 None 100Hz square

3 LTR data LTR data

4 QT 67.0Hz QT 67.0Hz

5 QT 151.4Hz QT 151.4Hz

6 QT 210.7Hz QT 210.7Hz

7 QT 250.3Hz QT 250.3Hz

8 DQT D023N DQT D023N

9 DQT D754I DQT D754I

10 DTMF DEC, (159D) DTMF DEC, (159D)

11 None DTMF tone 9

12 None None

13 Single tone 1200Hz Single tone 1200Hz

14 None MSK

15 MSK code MSK code

• Preparations for tuning the transceiver

Before attempting to tune the transceiver, connect the unit to a suitable power supply.

Whenever the transmitter is turned, the unit must be connected to a suitable dummy load (i.e. power meter).

The speaker output connector must be terminated with a

16Ω dummy load and connected to an AC voltmeter and an

audio distortion meter or a SINAD measurement meter at all times during tuning.

ADJUSTMENT

TK-480/481

• Transceiver tuning (To place transceiver in tuning mode)

System appears on LCD. Set system according to tuning

requirements.

LCD display (Test mode)

–

Group No.System No.

Press [S], now in tuning mode. Use [ B] button to write

tuning data through tuning modes, and channel selector knob to adjust tuning requirements (1 to 256 appears on LCD).

Use [C

] button to select the adjustment item through

tuning modes. Use [A] button to adjust 3 point tuning.

LCD display (Tuning mode)

FREQ

Adjustment (1~256)Adjustment item

3-point tuning frequency (MHz)

Test CH

Low 851.05000 806.05000 935.02500 896.02500

Center 860.50000 815.50000 938.02500 899.02500

High 869.90000 824.90000 940.90000 901.90000

TK-480 TK-481

RX TX RX TX

Adjustment Points

TX-RX unit (X57-5630-XX) Component side view

■ Tuning mode

Panel test mode

System/Group No.

[S]

FREQ : Frequency adj.

[S]

HPOW : High power

[S]

THPW : High power (T/A)

[S]

TLPW : Low power (T/A)

[S]

BAL : DQT balance

[S]

MAX : Max deviation L MAX

[S]

TMAX : Max deviation (T/A)

[S]

NMAX : Max deviation (NPSPAC)

[S]

DTMF : DTMF deviation

[S]

FMSK : MSK deviation

[S]

TONE : Tone deviation

[S]

[C]

LPW : Low power

[C]

(TK-480)

[C]

FQT : Fine QT

[C]

FDQT : Fine DQT

[C]

FLTR : LTR

[C]

SQL : Squelch

[C]

BATT : Battery

[C]

[C] [C]

[A]

L TMAX C TMAX H TMAX

[A]

L NMAX C NMAX H NMAX

[A]

C MAX H MAX

[C] [C]

[A]

[C]

[A]

[C]

[A]

[C]

IC30

IC14

TK-480/481

Common Section

1. Setting 1) BATT terminal voltage : 7.5V Standard modulation

MOD : 1kHz DEV : ±3kHz (TK-480)

±1.5kHz (TK-481)

Measurement

Test-

equipment

ADJUSTMENT

Unit Terminal

Unit Parts Method

Adjustment

Specifications/RemarksConditionItem

2. VCO lock 1) SYS – GRP : 1 – 1

voltage DVM

2) SYS – GRP : 7 – 1 4.3V or less. PTT : ON

3) SYS – GRP : 7 – 1 TA mode : ON PTT : ON

Power meter

TX-RX VC Check 0.5V or more.

Transmitter Section

Measurement

Test-

equipment

1. Frequency 1) SYS – GRP : 4 – ✽ f. counter Panel ANT Panel adjustment Select FREQ ✽ ✽ ✽ knob : 815.500MHz

in tuning mode. TK-481

PTT : ON : 899.025MHz

2. Maximum 1) SYS – GRP : 4 – ✽ power check Select HPOW 256

in tuning mode. Ammeter Panel ANT

PTT : ON

3. TX high 1) SYS – GRP : 4 – ✽ Panel power Select HPOW ✽ ✽ ✽ knob 1.7A or less adjustment in tuning mode.

PTT : ON

Power meter

Unit Terminal

Unit Parts Method

Adjustment

Encoder

TK-480 ±100Hz

Check 3.0W or more

Encoder

2.5W ±0.1W

Specifications/RemarksConditionItem

4. TX T/A 1) SYS – GRP : 4 – ✽ high power Select THPW ✽ ✽ ✽ adjustment in tuning mode.

PTT : ON

5. TX high 1) SYS – GRP : 1 – ✽, 7 – ✽ Check 2.0~3.0W power check TA mode : OFF and ON

(Press [A] key, then [C] key) 1.7A or less

PTT : ON

6. TX low 1) SYS – GRP : 4 – ✽ Panel power Select LPW ✽ ✽ ✽ knob 1.2A or less adjustment in tuning mode.

PTT : ON

7. TX T/A 1) SYS – GRP : 4 – ✽ low power Select TLPW ✽ ✽ ✽ adjustment in tuning mode.

PTT : ON

8. TX low 1) SYS – GRP : 1 – ✽, 7 – ✽ Check 0.5~1.5W power check Low power (Press [B] key) 1.2A or less

TA mode : OFF and ON

(Press [A] key, then [C] key)

PTT : ON

Encoder

1.0W ±0.1W

ADJUSTMENT

TK-480/481

Measurement

Test-

equipment

9. DQT BAL 1) SYS – GRP : 4 – ✽ adjustment Select BAL ✽ ✽ ✽ Deviation knob lation waves into

in tuning mode. meter square waves.

Deviation meter filter setting

LPF : 3kHz HPF : OFF AG

PTT : ON AF VTVM

10. MAX DEV 1) SYS – GRP : 4 – ✽ adjustment Select MAX ✽ ✽ ✽ TK-481 : 1.75kHz

in tuning mode. (According to the AG : 1kHz/150mV larger +, –.) Deviation meter filter setting

LPF : 15kHz HPF : OFF

Adjustment item

L MAX ✽ ✽ ✽ →C MAX ✽ ✽ ✽ →H MAX ✽ ✽ ✽

PTT : ON

11. T/A MAX 1) SYS – GRP : 4 – ✽ DEV Select TMAX ✽ ✽ ✽ adjustment in tuning mode.

AG : 1kHz/150mV Deviation meter filter setting

LPF : 15kHz HPF : OFF

Adjustment item

L TMAX ✽ ✽ ✽ →C TMAX ✽ ✽ ✽ →H TMAX ✽ ✽ ✽

PTT : ON

Power meter

Oscilloscope

Unit Terminal

Panel ANT Panel

Universal

Unit Parts Method

Adjustment

Encoder

Make the demodu-

TK-480 : 3.8kHz ±50Hz

Specifications/RemarksConditionItem

12. NPSPAC 1) SYS – GRP : 10 – ✽ TK-480 : 2.9kHz ±50Hz MAX DEV Select NMAX ✽ ✽ ✽ (According to the adjustment in tuning mode. larger +, –.)

AG : 1kHz/150mV Deviation meter filter setting

LPF : 15kHz HPF : OFF

Adjustment item

L NMAX ✽ ✽ ✽ →C NMAX ✽ ✽ ✽ →H NMAX ✽ ✽ ✽

PTT : ON

13. MIC 1) SYS – GRP : 4 – 1 Check TK-480 : 2.2~3.6kHz sensitivity AG : 1kHz/15mV (TK-480) TK-481 : 0.6~1.0kHz check AG : 1kHz/8mV (TK-481)

Deviation meter filter setting

LPF : 15kHz HPF : OFF

PTT : ON

14. T/A MIC 1) SYS – GRP : 4 – 1 sensitivity TA mode : ON check (Press [A] key, then [C] key)

AG : 1kHz/15mV (TK-480) AG : 1kHz/8mV (TK-481) Deviation meter filter setting

LPF : 15kHz HPF : OFF

PTT : ON

TK-480/481

ADJUSTMENT

Measurement

Test-

equipment

15. QT DEV 1) SYS – GRP : 4 – ✽

adjustment MIC input : OFF Deviation knob TK-481 : 0.45kHz

Select FQT ✽ ✽ ✽ meter

in tuning mode.

Deviation meter filter setting

LPF : 3kHz AG HPF : 50Hz AF VTVM De-emphasis : 750µs

PTT : ON

16. DQT DEV 1) SYS – GRP : 4 – ✽ adjustment Select FDQT ✽ ✽ ✽

in tuning mode.

Deviation meter filter setting

LPF : 3kHz HPF : OFF

PTT : ON

17.LTR DEV 1) SYS – GRP : 4 – ✽ TK-480 : 1.00kHz ±0.10kHz : TK-480 adjustment Select FLTR ✽ ✽ ✽ TK-481 : 0.75kHz ±0.05kHz : TK-481

in tuning mode.

Deviation meter filter setting

LPF : 3kHz HPF : OFF

PTT : ON

Power meter

Oscilloscope

Unit Terminal

Panel ANT Panel

Unit Parts Method

Adjustment

Encoder

TK-480 : 0.75kHz ±0.05kHz

Specifications/RemarksConditionItem

18. DTMF DEV 1) SYS – GRP : 4 – ✽ TK-480 : 3.00kHz ±0.15kHz : TK-480 adjustment Select DTMF ✽ ✽ ✽ TK-481 : 1.50kHz ±0.10kHz : TK-481

in tuning mode.

Deviation meter filter setting

LPF : 15kHz HPF : OFF

PTT : ON

19. MSK DEV 1) SYS – GRP : 4 – ✽ adjustment Select FMSK ✽ ✽ ✽

in tuning mode.

Deviation meter filter setting

LPF : 15kHz HPF : OFF

PTT : ON

20. TONE DEV 1) SYS – GRP : 4 – ✽ 2.5kHz ± 0.1kHz adjustment Select TONE ✽ ✽ ✽

in tuning mode.

Deviation meter filter setting

LPF : 15kHz HPF : OFF

PTT : ON

21. BATT 1) SYS – GRP : 4 – ✽ After pressing the BATT terminal voltage : 6.2V detection Select BATT ✽ ✽ ✽ PTT switch, confirm writing in tuning mode. that one predeter-

PTT : ON mined numeric in

the range 1 to 256 appears and then press [B] key. That numeric will be stored in memory.

ADJUSTMENT

TK-480/481

Measurement

Test-

equipment

22. BATT 1) SYS – GRP : 4 – 1 detection BATT terminal voltage : 5.7V Deviation knob LED (TX) blinks. check PTT : ON meter

2) BATT terminal voltage : 6.5V Transmit PTT : ON AG

Note : When the CPU is changed these adjustment values will become suitable values for NPSPAC, the deviations except MAX DEV in NPSPAC band

are automatically adjusted.

Power meter

Oscilloscope

AF VTVM

Unit Terminal

Panel ANT Panel

Unit Parts Method

Adjustment

Encoder

Check Can not transmit.

Specifications/RemarksConditionItem

Receiver Section

Measurement

Test-

equipment

1. Sensitivity 1) SYS – GRP : 1 – 1 SSG Panel ANT Check 12dB SINAD or more. check SSG output : –116dBm

MOD : 1kHz AF VTVM DEV : ±3kHz (TK-480)

:±1.5kHz (TK-481) Distortion

2. Squelch 1) SYS – GRP : 4 – ✽ Panel adjustment Select SQL ✽ ✽ ✽ knob closing squelch.

in tuning mode.

SSG output : 3dB below to

12dB SINAD level

Oscilloscope

meter

Unit Terminal

Unit Parts Method

Adjustment

Encoder

Specifications/RemarksConditionItem

Adjust to point of

3. Squelch 1) SYS – GRP : 4 – 1 Check Squelch must be opened. check

See Note. 2) SSG output : OFF Squelch must be closed.

Note : When squelch is adjusted, the microcomputer simultaneously reads and writes the RSSI level. Do not write adjustment values without the SSG

connected.

SSG output : 12dB SINAD level

TK-480/481

TERMINAL FUNCTION

CN No. Pin No.

CN1 1 B O

CN2 1 MON I

for X54-

SW 3 PTT I

section

CN3 1 AF O Audio output.

for 3 NC – Not use.

X54- 4 PF I External PF signal input.

Display

unit 6 RXD I Serial control signal input.

DISPLAY UNIT (X54-3210-XX A/2) : DISPLAY section

CN300

for 3 ME – MIC GND.

X57- 4 LBL I Backlight LED control.

TX-RX Normally:0V, lighting:5V.

unit 5 LG I

Name I/O Function

TX-RX UNIT (X57-5630-XX) : TX-RX section

Power input after passing through the fuse.

2B O

3 SB I Power output after power switch.

4 SB I Power output after power switch.

5 5M O 5V.

6 VOL I Volume level input for audio control.

7E – GND

8 EN2 I Encoder pulse input.

9E – GND

10 EN1 I Encoder pulse input.

2 LAMP I

4 GND – GND

2 AFE – Audio GND.

5 CK O Clock data output.

7 TXD O Serial control signal output.

8DT O

9 KRS O Key scan IC reset output.

10 KI1 I KEY input

11 KI2 I KEY input

12 GND - GND

13 5M O 5V.

14 AM O Audio mute signal output.

15 CS O LCD driver chip select output.

16 NC – Not use.

17 PTT I PTT signal input.

18 AUX I AUX key input.

19 LR O

20 LG O

21 LBL O Backlight LED control.

22 ME – MIC GND.

23 MIC I MIC signal input.

24 SB O Power output after power switch.

1 SB I Power input after power switch.

2 MIC O MIC signal output.

6LR I

7 AUX O AUX key output.

Power input after passing through the fuse.

Normally;5V, MON when connected GND.

Normally;5V, LAMP when connected GND.

Normally;5V, transmit when connected GND.

Data output for LCD driver/decade counter.

Mute:”L”, Unmute:”H”

TX LED control. Normally:0V, lighting:5V.

RX LED control. Normally:0V, lighting:5V.

Normally:0V, lighting:5V.

RX LED control. Normally:0V, lighting:5V.

TX LED control. Normally:0V, lighting:5V.

CN No. Pin No.

CN301

CN302

CN304

CN303

for x57-

TX-RX 3 PTT O

unit 4 GND – GND

Name I/O Function

8 PTT O PTT signal output.

9NC – Not use.

10 CS I LCD driver chip select input.

11 AM I Audio mute signal input.

Mute:”L”, Unmute:”H”

12 5M I 5V.

13 GND – GND

14 KI2 O KEY output

15 KI1 O KEY output

16 KRS I Key scan IC reset input

17 DT I

18 TXD I Serial control signal input.

19 RXD O Serial control signal output.

20 CK I Clock data input.

21 PF O External PF signal output.

22 NC – Not use.

23 AFE – Audio GND.

24 AF I Audio input.

1 SSW I EXT/INT speaker switch input.

2 SP+ O BTL output + for external speaker.

3 SP- O BTL output - for external speaker.

4 MSW I EXT/INT MIC switch input.

5 EMC I External microphone input.

6ME – External microphone ground.

7 PTT I External PTT input.

8 PF I Programmable function key input.

9NC – Not use.

10 E – GND

11 5M O 5V output

12 TXD O Serial data output.

13 RXD I Serial data input.

14 NC – Not use

1 SP O Output for internal speaker.

2E – GND

1NC – Not use.

2 LEDK I Backlight LED control.

3 LEDA O Backlight LED control.

4 VCI O LCD power supply.

5 SOD O Serial data output for LCD driver.

6 SID I Serial data input for LCD driver.

7 SCLK O Clock data output for LCD driver.

8 CS O LCD driver chip select output.

9 Vcc O 5V

10 GND – GND

DISPLAY UNIT (X54-3210-XX B/2) : SW section

1 MON O

2 LAMP O

Data input for LCD driver/decade counter.

Normally;5V, MON when connected GND.

Normally;5V, LAMP when connected GND.

Normally;5V, transmit when connected GND.

SRQPONMLKJIHGFEDCBA

DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2 Component side view

S301

MON

C330

C338

C337C329

C336

SP+

CN302

S302

PTT

SP–

C316

C317

J72-0517-22

LCD ASSY

S303

LAMP

PC BOARD VIEWS TK-480/481

D306

D301

–

MIC300

D308

D310

D305

D307

D309

741

J72-0517-22

Ref No. Address  D301 10A  D305 9K  D306 6K  D307 9N  D308 7N

Pattern 1 Pattern 2 Pattern 3 Pattern 4

Component side

Foil side

 D309 9Q  D310 7Q

41 42

A B C D E F G H I J K L M N O P Q R S

TK-480/481 PC BOARD VIEWS

DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2 Foil side view

R300 R302

R304 R305

C327

SSW

J72-0517-22

D321

EMC

R303

C302

Q300

C301

S300

AUX

CN303

GND

PTT

LAMP

MON

J72-0517-22

C340

L302

R325 R324

R332 C318

IC301

CP300

R331

C312

C339

C331

PTT

CN301

C328

MSW

SP+

SSW

EMC

PTT

SP–

TXD

RXD

MSW

D319

R339

R312R311

L309 L308

R301

C332

D300

R340 R341

R338

CN300

GND

Q310

AUX

R318

3 4

C343

MIC

PTT

LBL

R306

Q301

Q308

1 6

3 4

IC300

R314

D320

L305

L304

C333

C344

RXD

KI1

TXD

KRS

KI2

R315

C307

C326

C335

D316

D302

C309

Q307

CP301

C311 R309

Q305

R316

R308

E C B

Q304

C341 C342

+ C313

C304

R319

D304

R336

R317 C308

Q306

L301

R313

L306

R326

TH300

L307

L300

R327

R333

Q309

R328

D303

D318

D317

D315

CP303

R320

R321

CP302

C310

43 44

C314

C321

SP+ SP–

L303

LEDK

VCC

SCLK

SOD

LEDA

CN304

R337 C323 C324

C325 C322

+MIC

C315

Ref No. Address  IC300 7I  IC301 8G  Q300 5P  Q301 6H  Q302 11R  Q303 10R  Q304 9H  Q305 9H

MIC

–

Ref No. Address  Q306 11H  Q307 11H  Q308 7H  Q309 9J  Q310 7G  D300 6M  D302 9G  D303 9I

Ref No. Address  D304 10H  D315 9G  D316 9G  D317 9F  D318 9F  D319 5L  D320 6I  D321 4P

Q303

Q302

R310 C305

R307

Component side

Pattern 1 Pattern 2 Pattern 3 Pattern 4

Foil side

GND

SID

VCI

SRQPONMLKJIHGFEDCBA

DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2 Component side view + Foil side

J72-0517-22

S300

S301

MON

D321

R300

EMC

R303

C302

C301

AUX

R302

C326

R304 R305

C335

C327

Q300

SSW

C338

CN301

C330

C337C329

MSW

SP+

SSW

EMC

SP–

PTT

C336

C328

TXD

SP+

SP–

CN302

RXD

C331

PTT

R338

S302

PTT

C316

C339

C332

C317

R340 R341

D319

R339

R301

R312

R311

D300

L309

MSW

L308

LCD ASSY

S303

LAMP

PC BOARD VIEWS TK-480/481

CN303

LAMP

MON

GND

PTT

CN300

GND

AUX

MIC

Q301

6 4

LBL

1 3

D306

R306

L305

L304

C333

C344

D320

R314

IC300

PTT

R318

Q308

3 4

Q310

C343

RXD

KI1

TXD

KRS

KI2

CP300

C307

R315

R325 R324

C340R331

C312

R332 C318

IC301

D308

L302

1 8

D310

D301

R310 C305

R307

Q303

Q302

–

MIC300

C315

+MIC

R337 C323 C324

C325 C322

CP301

SP+ SP–

GND

VCC

SID

SCLK

CN304

LEDK

VCI

L303

LEDA

SOD

C314

C321

Q309

L301 L300

R327

R328

R326

TH300

R333

L307

C311

D303

R313

L306

D305

R319 R336

R309

+ C313

R317 C308

Q306

Ref No. Address  IC300 7K  IC301 8N  Q300 5D  Q301 6L  Q302 11B  Q303 10B  Q304 9L  Q305 9L

Q305

Q304

C341 C342

C304

D304

Ref No. Address  Q306 11L  Q307 11L  Q308 7L  Q309 9J  Q310 7M  D300 6G  D301 10A  D302 9M

R316

R308

C309

Q307 E

C B

D315

D302

D316

CP303CP302

R320

C310

R321

Ref No. Address  D303 9K  D304 10L  D305 9K  D306 6K  D307 9N  D308 7N  D309 9Q

D307

D318

D317

741

Ref No. Address  D315 9M  D316 9M  D317 9N  D318 9N  D319 5H  D320 6K  D321 4D

D309

J72-0517-22

Component side

Pattern 1 Pattern 2 Pattern 3 Pattern 4

Foil side

Connect 1 and 4

 D310 7Q

45 46

A B C D E F G H I J K L M N O P Q R S

TK-480/481 PC BOARD VIEW

TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481 Component side view

GND

OPT

LOK

AAC

RXEMAI

RXWMAO

RXD

TXD

AUXRXD

AUXTXD

AUDIOBEEP

RSSI

MONI

LAMP

DEO

DI9

RXAO

RXAI

PTTOUT

TXAO

PTTIN

TXAI/MUTE

DI/ANI

R419 R420

C111 C112

Q22

R87

C107

R423

C100

R11

R148

C138

R88

C123

C10

GND

C120

R98

C109

C263

R13

R164

CN2

PTT

C191

IC3

LAMP

C200

R86 C58

R422

C188

D18

C197

4 5

IC1

C92

1 2 3 4

3 4

MON

C11

C195

C201

R99

IC4

1213

R417 R14

C18

R12

CN10

C196

R32

C189

C190

R157

GND

KI2

KI1

KRSDTTXD

RXDCKPFNCAFE

R122

R250

PTTNCCSAM5M

R147

MICMELBLLGLR

AUX

C80

R161 R162

R59

C26

IC10

C79 R57

C199

C75

C15 C60

C56

R56

R21

R54

R16

C28

CF1

R25 R23

IC8

C53

IC14

C37

CD1

C61

C156

CN3

D17

CF2

C55

R40

C62

R51

Q 5

R49

C155

C154

L20

XF1

IC30

C163

L25 C160

R129

R128

C175

C173

ANT

C169

C134

R127

L27

C167

R136

R137

L30

C166

L28

L31

L32

C174

D10

C40

C168

C176

L29 CN1

C143

R156

C3C2C1

EN1EEN2EVOL5MSBSB+B

L11

C7 C16

R10

IC2

C68

R2 C4

R17

C19

C12

IC5

C22

R103

J72-0812-02

DTA144EE

2SB1132

IMN10

2SB798

2SC4988

DA221

DTC114EE

DTC144EE 2SA1832 2SC4617 2SC4619 2SC5108

MA742

3SK318

3SK274

UPA672T

2SJ243

S-81350HG-KD

2SK1824

47 48

Ref No. Address  IC1 4H  IC2 8R  IC3 7F  IC4 5G  IC5 9S  IC8 7I  IC10 7I

Ref No. Address  IC14 6K  IC30 3O  Q5 9L  Q7 5F  Q22 6F  D2 9R  D6 5M

Ref No. Address  D7 5P  D9 6Q  D10 6R  D17 9G  D18 9F

Component side

Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6

Foil side

SRQPONMLKJIHGFEDCBA

TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481 Foil side view

IC6

CN12

C29

C13

C25

C21

C38

IC7

C30 C31

CN11

R130

R132

C20

C17

C164

R36

R131

R133

R37

C161

L19

C34

L18

C139

C135

R101

R96

C129

R134

C165

R135

R145 R144

C133

C132

R94

R91

C125

R140

IC21

4 5

C170

C198

Q14

R100

L14 L15

C127

C122

R169

C172

Q15

R141

Q20

R170

C209

CN4

Q18

C171

R15

R76

R151

R60

R146

R143

C145

D 4

R113

C99

G2 D

C84 R27

Q13

C153

R142

C140

Q17

C193

R105

C150 L23

C146

R108

C110

L21

Q 11

R154

L34

L10 R65 C91

C152

L24

Q12

R114

C149

C192

C94 C78 C81

R62

R115

C142

R152

R153 C136

R155

C208

R165

R109

C194

R102

R167

C63

C B

R168

Q10

L17

R97

PC BOARD VIEW TK-480/481

R53

C74

C67

R50

R106

R110

R83

C118

C108

R89

R259

R77

CP1

1 11

R55

C76

R61 R64

C77

C82

R44

R58

R63

Q16

R66

R126

C144

C203

R112

C83

C159

R67

IC12

C85

C90

C86

C98

C106

C89

C93 R71 R73

C96

IC19

4 5

IC18

IC16

L22

C261

C87

R111

C141

R107

R276 R421

R408

L53

R118

CN8

IC17

R81

2333

C102

L54

C103

+ C101

CN9

R74

R84

R80

C115

C126

C97

C121C114

R82

CP21

R125 R124 R123 R201

R202 R203 R204 R205

R206

R207 R139 R116 C147

L16

R418

R200

CP18

CP20

CP22

CP19

CP17

CP16

IC15

100

1 25

C207

C205

R120

R138

CP3

R211

C148

C262

C206

CP11

CP13

CP12

CP5

R149

R104

CP14

CP15

5175

R150

CP10

CP9

CP8

R297 R298

CP7

CP6

CP24

R218

R248

D11

C157

C162

C158

L26

IC13

C187

C52

C105

R75R78

C88

C57

L12

C59

C182

R69

C181

R70 R42

IC11

R117

C151

C185

R159

R43

D12

C180

C183

C177

R72 R68

1011

C178

R38

C95

R35

C69

C179

C73

R166

R90

C130

R92

C186

R85

R95

R93

C44

C131 C137

C128

R31

L13

C119 C117

C116

R79

C104

C184

C14

R39

C24

Q21

CN6

C33

Q23

C202

C36

CN5

C35

R29 R34

C32 C39 C54

R158

R22

R24

IC9

C48

C46

C45

C51 R41

C27

C43

R18 R19

C42

C50

C47

L35

Q19

R26

R28

CN7

TH2

R121

C124 C113

L55 L56

C66

R45

R47

C72

C70

R48

C71

R46

C23

R171

R20

R163

C41

R160

C204

C64

3 4

IC23

C49 R33

J72-0812-02

C65

TK11250BM

TC35453F

30622M8A-4F9GP

M68757H M68757L

AT29C020-90TI W29C020C90

SA7025DK

AT2408N10SI2.5

NJU7201U50

TC74HC4017AF

BU4094BCFV

Ref No. Address  IC6 6B  IC7 7B  IC9 9I  IC11 5J  IC12 6N  IC13 3L  IC15 7Q  IC16 3R  IC17 5Q  IC18 3Q  IC19 3P  IC21 5D  IC23 9L  Q1 7E

Ref No. Address  Q2 7E  Q3 7I  Q4 6C  Q6 8F  Q8 6H  Q9 7D  Q10 7G  Q11 6F  Q12 5F  Q13 5F  Q14 6D  Q15 5E  Q16 8N  Q17 7F

Ref No. Address  Q18 6E  Q19 8J  Q20 7E  Q21 7J  Q23 8H  D1 6K  D3 8K  D4 7E  D5 7F  D8 8L  D11 9N  D12 6I

Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6

Component side

Foil side

A B C D E F G H I J K L M N O P Q R S

TK-480/481 PC BOARD VIEW

TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481 Component side view + Foil side

GND

OPT

CP14

LOK

CP15

AAC

R150

RXEMAI

CP10

RXWMAO

CP9

RXD

CP8

TXD

R297 R298

AUXRXD

CP7

AUXTXD

CP6

AUDIOBEEP

CP24

4 5

IC16

L22

L53

C261

IC18

R408

IC17

C206

CP18

CP13

CP16

CP17

CP19

CP22

CP11

CP12

51 75

IC15

RSSI

R218

CP5

R149

R104

CP3

C262

R138

R211

C148

R248

L26

C157

C158

C162

CP20

125

C205

IC19

100

R276 R421

R200

R120

CP21

R125

R124 R123 R201 R202

R203

R204

R205

R206

R207

R139 R116 C147

C207

R418

MONI

LAMP

DEO

CN8

DI9

RXAO

RXAI

PTTOUT

CN9

L16

TXAO

PTTIN

TXAI/MUTE

DI/ANI

R419 R420

C98

C87

C106

R87

R67

GND

R89

C120

R88

R111

C141

R107

R118

CP1

R81

23 33

C102

C101

R80

C115

C121C114

R82

C123

G S

C107

R11

C89

C10

R148

C138

C96

IC12

R64 C85

R66

C86

C159

R98

C109

C263

R13

C83

C90

R164

R61

R63

C203

C111 C112

Q22

R423

C100

L54

C103

C93

R71 R73

R74

R84

C126

C97

D11

CN2

PTT

C191

IC3

C82

LAMP

C200

R86

C58

R422

C77

C188

Q16

CN3

D18

C118

111

C189

RXDCK PFNCAFE

R83

MON

C201

C76

R126

R259

C18

R32

C190

R44

KRSDTTXD

C144

C108

R77

C11

IC4

R53

R55

R12

R58

GND

KI2

KI1

R106

D17

R110R112

C74

R417

C67

R14

C196

L55 L56

C72

R157

7 8

IC13

4 5

IC1

C124C113

C195

C66

C70

R48

C71

R46

C23

R50

CN10

R250

AUX

PTTNCCSAM5M

C64 1

3 4

IC23

C65

C92

R122

C197

R45

1213

MICMELBLLGLR

R160

R121

R38

C95

R35

CN7

R47

R161 R162

R59

C26

C80

C15

C60

C56

R56

R25

R23

IC10

IC8

R21

C24

R171

R54

R16

C199

C79

R57

C75

R163

TH2

R20

R147

C41

C204

C28

L35

CF1

J72-0812-02

C187

C52

IC30

C105

C88

C57

C182

R69

C181

R70

R42

R159

R43

R166

R85

C117

CN6

R29R34

R22

C46

8 9

CF2

C45

C186

C128

R158

IC9

C48

1 2 3 4

R130

C135

L28

L18

L11

L30

R101

CN11

C166

C20

R36

R37

C40

C168

C17

C34

C163

L24

L21

Q 11

C192

L34

L10 R65

C91 C94 C78 C81

R62

C150

C155

L23

C146

R108

R154

Q17

C110

Q13

C154

C140

C193 R105

XF1

C153

R142

L20

C84 R27

R146

L25

R143

R129

R113

C99

G2 D

CN4

Q18

C171

C145

D 4

R76

R60

C172

Q15

R128

R15

R151

C160

R141

R144

Q20

R170

C209

L12

3 4

C185

C59

IC14

R90

C130

R92

R165

E C

R114

R109

C152

C156

Q12

C149

R115

C142

R117

R99

C151

R95

R93

C44

C194

R152

R31

Q10

C131 C137

Q23

R153 C136

R97

L17

R102

R155

C208

R167

R168

C61

CN5

R51

C63

C32C39C54 R18 R19

C55

C49

CD1

C33

C202

C36

C35

R40

C62

Q 5

R49

R127

C170

R169

IC21

C68

C122

C167

C198

L14 L15

R140

R145

R100

C132

C127

R134

C165

1 45

L27

R136

Q14

C133

R94

C125

R135

R137

C161

R91

R132

C169

C134

C164

R131

R133

C139

S G1

R96

C129

L19

C175

C173

ANT

L31

CN12

L32

R156

C174

D10

C13

C176

L29 CN1

C21

C143

IC6

C38

C29

C25

IC7

C30C31

C7 C16

R10

IC2

R17

C22

R2 C4

C19

R103

C3C2C1

EN1EEN2EVOL5MSBSB+B

C12

IC5

O G

R33

C177

R75 R78

R72 R68

C37

1011

C53

C178

Q21

C180

R39

C184

C14

IC11

C183

D12

C104

L13

C119

C116

C69

C179

C73

R79

C50

C47

R24

Q19

C51 R41

R26

C27

C42

R28

C43

NJM2904V

M62364FP

TA75W02FU

TDA7053AT

TC75W51FU

RN5VL42C

TA31136FN

LC73872M

TA75S01F

51 52

Ref No. Address  IC1 4H  IC2 8R  IC3 7F  IC4 5G  IC5 9S  IC6 6R  IC7 7R  IC8 7I  IC9 9K  IC10 7I  IC11 5J  IC12 6F  IC13 3H  IC14 6K  IC15 7C

Ref No. Address  IC16 3B  IC17 5C  IC18 3C  IC19 3D  IC21 5P  IC23 9H  IC30 3O  Q1 7O  Q2 7O  Q3 7K  Q4 6Q  Q5 9L  Q6 8N  Q7 5F  Q8 6L

Ref No. Address  Q9 7P  Q10 7M  Q11 6N  Q12 5N  Q13 5N  Q14 6P  Q15 5O  Q16 8F  Q17 7N  Q18 6O  Q19 8J  Q20 7O  Q21 7J  Q22 6F  Q23 8L

Ref No. Address  D1 6I  D2 9R  D3 8I  D4 7O  D5 7N  D6 5M  D7 5P  D8 8H  D9 6Q  D10 6R  D11 9F  D12 6K  D17 9G  D18 9F

Component side

Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6

Foil side

Connect 1 and 6

OMKIGECA

TRPNLJHFDB

Note : Components marked with a dot (·) are parts of pattern 1.

SCHEMATIC DIAGRAM TK-480/481

TK-480/48 1TK-480/481

BLOCK DIAGRAM

VCO

IC14

C131

PLL

Q10

C136

Q17

C193

Q11

C149

Q12

C152

Power

module

D7 C169

L30

ANT

2.5W

–11.7dBm

(Q10 open)

–7.8dBm

(Q17 open)

–1.9dBm

(D5 open)

+7.1dBm

(Q12 open)

+17.5dBm

(C152 open)

RF (815.50MHz)

EMC

MIC

LPF

ALC

COMP

IDC

DAC

15 16

IC12

16.6mVrms

17.2mVrms 39.2mVrms 331mVrms 320mVrms

310mVrms

IC4 IC3 (1/2) IC4

487mVrms 179mVrms 311mVrms 154mVrms

DAC

IC12

C58

IC3

IC4

AMP

IC300

500mW

(BTL)

203mVrms 287mVrms 419mVrms 135mVrms 29mVrms

C169

L30

ANT

C143

L11

C139

Q9 C122

L20

C110

R60

XF1

R51

C55

FM IF

SYSTEM

CF1,2

IC8

AMP

–118.0dBm –119.0dBm –119.4dBm –120.4dBm –107.0dBm –110.3dBm –106.8dBm –116.4dBm

–109.6dBm

(C55 open)

241mVrms 265mVrms

–79.2dBm –80.2dBm

RF (860.50MHz)

IF1 (44.85MHz)

IF2

(455kHz)

To make measurements in the AF section,

connect the oscilloscope proves directly.

(ANT input : –47dBm, 1kHz FM, 3kHz dev.)

In the RF section, use a 1000pF coupling capacitor.

(The display shows the SSG input value required

to obtain 12dB SINAD.)

AG is set to the MIC input

becomes 3kHz Dev at 1kHz MOD.

To make measurements in the

AF section, connect the

oscilloscope proves directly.

In the RF section, use a 1000pF

coupling capacitor.

TK-480/481

LEVEL DIAGRAM (TK-480)

RX Section

TX Section

TK-480/481

VCO

IC14

C131

PLL

Q10

C136

Q17

C193

Q11

C149

Q12

C152

Power

module

D7 C169

L30

ANT

2.5W

–10.2dBm

(Q10 open)

–7.4dBm

(Q17 open)

–0.4dBm

(D5 open)

+5.3dBm

(Q12 open)

+17.8dBm

(C152 open)

RF (899.00MHz)

EMC

MIC

LPF

ALC

COMP

IDC

DAC

15 16

IC12

16.1mVrms

16.7mVrms 41.2mVrms 353mVrms 338mVrms

318mVrms

IC4 IC3 (1/2) IC4

530mVrms 133mVrms 109mVrms 54mVrms

DAC

IC12

C58

IC3

IC4

AMP

IC300

500mW

(BTL)

188mVrms 254mVrms 376mVrms 132mVrms 29mVrms

C169

L30

ANT

C143

L11

C139

Q9 C122

L20

C110

R60

XF1

R51

C55

FM IF

SYSTEM

CF1,2

IC8

AMP

–118.0dBm –118.4dBm –118.4dBm –118.0dBm –108.3dBm –106.6dBm –105.5dBm –117.0dBm

–107.5dBm

(C55 open)

115mVrms 268mVrms

–58dBm –55dBm

RF (938.00MHz)

IF1 (44.85MHz)

IF2

(455kHz)

To make measurements in the AF section,

connect the oscilloscope proves directly.

(ANT input : –47dBm, 1kHz FM, 1.5kHz dev.)

In the RF section, use a 1000pF coupling capacitor.

(The display shows the SSG input value required

to obtain 12dB SINAD.)

AG is set to the MIC input

becomes 1.5kHz Dev at 1kHz MOD.

To make measurements in the

AF section, connect the

oscilloscope proves directly.

In the RF section, use a 1000pF

coupling capacitor.

LEVEL DIAGRAM (TK-481)

RX Section

TX Section

TK-480/481

KNB-16A/17A (Ni-Cd BATTERY) /

KPG-36 (PROGRAMMING INTERFACE CABLE) / KSC-19 (CHARGER)

KNB-16A KNB-17A External View External View

KNB-16A KNB-17A Circuit Diagram Circuit Diagram

Discharge pin side

Breaker (80±5°C)

Breaker (70±5°C)

Discharge pin side

Breaker (80±5°C)

–

Breaker (70±5°C)

KPG-36 External View

KSC-19 External View

–

Diode

Thermister

+ –

Charge pin side

Diode

Thermister

Charge pin side

KNB-16A Specifications

Voltage ....................................... 7.2V (1.2V x 6)

Charging current ........................ 1100mAh

Dimensions (mm) ...................... 58 W x 110.8 H x 17.2 D

(Projections included)

Charger and charging time

KSC-19 (Normal Charger) ...... Approx. 8 hours

KSC-20 (Rapid charger) ......... Approx. 1 hour

Weight ....................................... 180g

KNB-17A Specifications

Voltage ....................................... 7.2V (1.2V x 6)

Charging current ........................ 1500mAh

Dimensions (mm) ...................... 58.0 W x 110.8 H x 20.0 D

(Projections included)

Charger and charging time

KSC-19 (Normal Charger) ...... Approx. 8 hours

KSC-20 (Rapid charger) ......... Approx. 1.3 hour

Weight ....................................... 220g

–

KSC-19 Charging

KNB-16A

Voltage ................................................. 7.2V

Battery capacity ................................... 1100mAh

Charging time ....................................... Approx. 8 hours

KNB-17A

Voltage ................................................. 7.2V

Battery capacity ................................... 1500mAh

Charging time ....................................... Approx. 8 hours

TK-480/481

General

Frequency Range

RX ......................................................... TK-480 : 851 to 870MHz TK-481 : 935 to 941MHz

TX ......................................................... TK-480 : 806 to 825MHz (851 to 870MHz : Talk-Around)

Systems .................................................... Maximum 32

Groups ...................................................... Maximum 250

Conventional Channels ............................. Maximum 600

Channel Spacing ....................................... TK-480 : 25kHz (PLL channel step 12.5kHz)

Battery Voltage ......................................... DC 7.5V

Battery Life ............................................... More than 8 hours at 5-5-90 duty cycle with KNB-16A battery

Temperature Range .................................. –30°C to +60°C (–22°F to +140°F)

Dimensions and Weight

With KNB-16A (1100mAh battery) ...... 135 (5.33) H x 58 (2.29) W x 34 (1.34) D mm (inch) 1.01lbs (460g)

(Dimensions not including protrusions, weight includes antenna and belt hook)

Receiver (Measurements made per TIA/EIA-603)

RF Input Impedance ................................. 50Ω

Sensitivity

12dB SINAD* ....................................... 0.30µV

Selectivity* ............................................... TK-480 : 70dB±25kHz TK-481 : 63dB±12.5kHz

Intermodulation* ...................................... TK-480 : 65dB±25/50kHz TK-481 : 60dB±12.5/25kHz

Spurious (Except for IF 1/2)* .................... 70dB

Frequency Stability ................................... TK-480 : ±0.00025% (–30°C to +60°C)

Channel Spread......................................... TK-480 : 19MHz TK-481 : 6MHz

Audio Power Output ................................. 500mW at 16Ω less than 5% distortion

SPECIFICATIONS

TK-481 : 896 to 902MHz (935 to 941MHz : Talk-Around)

TK-481 : 12.5kHz (PLL channel step 12.5kHz)

TK-481 : ±0.00015% (–30°C to +60°C)

* : Typical specifications

Transmitter (Measurements made per TIA/EIA-603)

RF Power Output

High ...................................................... 2.5W

Low ...................................................... 1W

RF Output Impedance .............................. 50Ω

Spurious .................................................... –60dB

Modulation ................................................ TK-480 : 16K0F3E, 16K0F1D, 15K0F2D, 14K0F3E, 14K0F1D, 13K0F2D

TK-481 : 11K0F3E, 11K0F1D, 10K5F2D

FM Noise .................................................. TK-480 : –45dB TK-481 : –40dB

Audio Distortion ........................................ 5.0% or less

Frequency Stability ................................... TK-480 : ±0.00025% (–30°C to +60°C)

TK-481 : ±0.00015% (–30°C to +60°C)

Channel Spread......................................... TK-480 : 64MHz TK-481 : 45MHz

TK-480/481

KENWOOD CORPORATION

14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo 150-8501, Japan

KENWOOD SERVICE CORPORATION

P.O. BOX 22745, 2201 East Dominguez Street, Long Beach, CA 90801-5745, U.S.A.

KENWOOD ELECTRONICS CANADA INC.

6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8

KENWOOD ELECTRONICS DEUTSCHLAND GMBH

Rembrücker Str. 15, 63150 Heusenstamm, Germany

KENWOOD ELECTRONICS BELGIUM N.V.

Mechelsesteenweg 418 B-1930 Zaventem, Belgium

KENWOOD ELECTRONICS FRANCE S.A.

13, Boulevard Ney, 75018 Paris, France

KENWOOD ELECTRONICS U.K. LIMITED

KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom

KENWOOD ELECTRONICS EUROPE B.V.

Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands

KENWOOD ELECTRONICS ITALIA S.p.A.

Via G. Sirtori, 7/9 20129 Milano, Italy

KENWOOD IBERICA S.A.

Bolivia, 239-08020 Barcelona, Spain

KENWOOD ELECTRONICS AUSTRALIA PTY. LTD.

(A.C.N. 001 499 074) 16 Giffnock Avenue, Centrecourt Estate, North Ryde, N.S.W. 2113 Australia

KENWOOD ELECTRONICS (HONG KONG) LTD.

Unit 3712-3724, Level 37, Tower one Metroplaza, 223 Hing Fong Road, Kwai Fong, N.T., Hong Kong

KENWOOD ELECTRONICS TECHNOLOGIES(S) PTE LTD.

Sales Marketing Division 1 Ang Mo Kio Street 63, Singapore 569110

Kenwood TK-481, TK-480 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SYSTEM SET-UP

OPERATING FEATURES

1. Operation Features

2. Transceiver Controls and Indicators

3. Scan Operating

4. Details of Features

5. Option Signalling

7. Audible User Feedback Tones

REALIGNMENT

1. Modes

2. How to Enter Each Mode

3. Panel Test Mode

4. Panel Tuning Mode

5. PC Mode

6. Firmware Programming Mode

7. Clone Mode

CIRCUIT DESCRIPTION

1. Overview

2. Circuit Configuration by Frequency

3. Receiver System

4. Transmitter System

5. Frequency Synthesizer Unit

6. Control Circuit

7. Signalling Circuit

8. Power Supply Circuit

9. Optional Board Terminal

SEMICONDUCTOR DATA

Microprocessor : 30622M8A-4F9GP (TX-RX Unit IC15)

Shift Register 1 : BU4094BCFV (TX-RX Unit IC18)

Shift Register 2 : BU4094BCFV (TX-RX Unit IC19)

VCO System : KCH31, KCH32 (TX-RX Unit IC14)

PLL System : SA7025DK (TX-RX Unit IC11)

DESCRIPTION OF COMPONENTS

DISPLAY UNIT (X54-3210-XX)

TX-RX UNIT (X57-5630-XX)

TK-480/48 1

PARTS LIST

EXPLODED VIEW

PACKING

ADJUSTMENT

Test Equipment Required for Alignment

Repair Jig (Chassis)

How to Remove the Flat Cable

Test Mode

Adjustment Points

Common Section

Transmitter Section

Receiver Section

TERMINAL FUNCTION

PC BOARD VIEWS TK-480/481

SCHEMATIC DIAGRAM TK-480/481

BLOCK DIAGRAM

SPECIFICATIONS