KENWOOD TK480 Service Manual

KENWOOD TK480 Service Manual
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Service Manual for KENWOOD TK480, downloadable as a PDF file.

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B51-8408-20 (N) 1015

800MHz/900MHz FM TRANSCEIVER

TK-480/481

SERVICE MANUAL

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) .... 61

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

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

CAUTION

When using an external power connector,

please use with maximum final module pro-

tection of 9V.

CONTENTS

REVISED II

Photo is TK-480/481 K2 type.

(Produced in Singapore)

This service manual applies to products with 30100001 or

subsequent serial numbers.

Knob (PTT)

(K29-5157-03)

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)

Cabinet assy

(A02-3659-03) : K2

Badge

(B43-1139-04)

Packing

(G53-0841-02) : K2

TK-480/481

GENERAL / SYSTEM SET-UP

INTRODUCTION

SCOPE OF THIS MANUAL

This manual is intended for use by experienced techni-

cians familiar with similar types of commercial grade com-

munications equipment. It contains all required service in-

formation for the equipment and is current as of this publica-

tion 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 informa-

tion, 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 person-

nel 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 tech-

nicians.

SERVICE

This radio is designed for easy servicing. Refer to the

schematic diagrams, printed circuit board views, and align-

ment 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 &

X57-5630-XX

X54-3210-XX

Frequency range

Remarks

QT/DQT

DTMF

Charger Battery

16 key

destination

0-10

0-11

0-10

0-11

TK-480

806~870MHz

IF1 : 44.85MHz

Option

LOC : 44.395MHz

TK-481

896~941MHz

IF1 : 44.85MHz

Option

LOC : 44.395MHz

Note

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

Merchandise received

License and frequency allocated by FCC

Choose the type of transceiver

Transceiver programming

Are you using the speaker microphone?

Delivery

806~825

2.5W

TK-480 K,K2

851~870

896~902

TK-481 K,K2

935~941

Frequency range (MHz) RF power

Type

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.)

YES

KMC-25

Speaker microphone

(Option)

SYSTEM SET-UP

TK-480/481

OPERATING FEATURES

1. Operation Features

The TK-480/481 is an 800/900MHz band EFJ LTRTM-com-

patible 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

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 ex-

plained 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.

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 param-

eters, such as the system and group, are stored in

memory. When the power is switched on again, the sys-

tem 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 trans-

mission, the brightness of this indicator decreases at in-

tervals of about one second, so it can be used as the bat-

tery voltage alert function.

S, A,

B, and C

key (Programmable)

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 (op-

tional) 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 se-

lected), 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, Moni-

tor 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

s Auto TEL

Automatically connects available repeaters that are con-

nected 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.

s AUX

This function can be programmed when the voice scram-

bler 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.

s DTMF ID (BOT)

Pressing this key in Conventional mode, automatically

sends the preset Connect ID.

s DTMF ID (EOT)

Pressing this key in Conventional mode, automatically

sends the preset Disconnect ID.

s Display character

This key switches the LCD display between the system/

group number and system/group name.

s Emergency

Pressing this key for longer than the programmed "Emer-

gency Key Delay Time" causes the transceiver to enter the

emergency mode. The transceiver jumps to the pro-

grammed "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 ra-

dio and the switch is activated, the radio enters Emergency

mode after the specified "Man Down Delay Time" expires.

s Function

Pressing this key causes the transceiver to display

"FCN". Then, pressing a DTMF key causes the correspond-

ing programmed function to start. This key may be conve-

nient when using many functions with the 12-key keypad

(K2 type).

s 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.

s Home group

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

s 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.

s 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.

s 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.

s Monitor

Used to release signalling or squelch when operating as a

conventional. It is also used to reset option signalling.

s 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.

s RF power low

Used to temporarily switch transmission output to low

power. Turning the function on enables:

Low, LowLow

Key states are backed up, except in the PC mode when

they are reset.

s Scan

Press this key starts scanning. Pressing this key stops

scanning.

s 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.

s 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 tempo-

rarily deleted and scanning restarts.

This key operates even when "Scan Type" is set to "List

Type System Scan".

s 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.

TK-480/481

OPERATING FEATURES

s 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.

s Telephone disconnect

Pressing this key ends an RIC connection (disconnects

the telephone line).

s 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

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 de-

lete indicator (

) and the right is used for the selective

call (

) or scrambler ( _ ) function. The delete/add indica-

tor shows the systems locked out of the scanning se-

quence. Selective call and scrambler are optional func-

tions that can be programmed.

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 en-

tered. Scanning starts from the system following the cur-

rently 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.

s 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.

s 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:

s Fixed lockout

The system to be locked out is selected by programming.

When a locked system is selected, the Delete (

) indicator

appears on the left of the SYSTEM indicator. The revert sys-

tem is scanned even if it is locked out. If there is a locked

system, the Delete (

) indicator flashes during fixed scan-

ning.

s 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 (

) indicator

is displayed on the left of the SYSTEM indicator.

Sub display

Displays the system, channel and group numbers. Also

displays various functions, such as TA.

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 pro-

grammed 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 (FleetSyncTM) is re-

ceived. Lights when a status message is stored in the

stack memory.

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