Kenwood TK 285 N Service Manual

Page 1

VHF FM TRANSCEIVER

TK-285/ N

SERVICE MANUAL

KENWOOD

© 2000-6 PRINTED IN JAPAN
B51-8530-00(S) 847

Helical antenna
(T90-0733-05):K, E
(T90-0734-05):(N)M

Knob (ENC)
(K29-5232-03)

Knob (VOL)
(K29-5231-03)

Panel assy

(A62-0535-04)

(B43-1106-14)

Knob (PTT etc) 40
(K29-5157-03)

Cabinet assy
(A02-2055-53)
(16 keys)

Packing
(G53-0896-02)
(16 keys)

Photo is K type

- CONTENTS -

GENERAL ................................................................................ 2
SYSTEM SET-UP ............
OPERATING FEATURES ..
REALIGNMENT ....................................................................... 4
CIRCUIT DESCRIPTION .......................................................... 6
SEMICONDUCTOR DATA ............... 11
DESCRIPTION OF COMPONENTS. 13
PARTS LIST ...................................... 14
EXPLODED VIEW .................................................................. 22
PACKING ................................................................................ 23
ADJUSTMENT ................. 24
TERMINAL FUNCTION 32
PC BOARD VIEWS

DISPLAY UNIT (X54-3210-13) ............................................ 33

TX-RX UNIT (X57-619X»XX) ............................................... 39
SCHEMATIC DIAGRAM .. 45
BLOCK DIAGRAM . 49
LEVEL DIAGRAM ..... 51
OPTIONS ................................................................................ 52
SPECIFICATIONS ............................................... BACK COVER

CAUTION

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

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TK-285/(N)

GENERAL] SYSTEM SET-UP

INTRODUCTION

SCOPE OF THIS MANUAL

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

ORDERING REPLACEMENT PARTS

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

PERSONNEL SAFETY

The following precautions are recommended for personnel

safety:

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

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

. This equipment should be serviced by a qualified technician
only.

SERVICE

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

YES
( ' ' 7 >_.
Are you usrng the speaker microphone. Speaker microphone

I Delivery I

Transceiver programming

Unit
Model & TX-RX unit Display unit Frequency range Remarks Charger Battery
destination
K X57 6190 11 RX I 217~250MHZ IF1 '44 85MHZ OP
TK-285 E X54-3210-13 TX :218~250MHZ LOC :44-395MHZ OP V
(N)M X57-619021 240~270MHZ ' I OP
SYSTEM SET-UP
( Merchandise received ) Frequency range (MHZ) RF power Type
TX 218~250
5.0W TK-285 K,E
Choose the type of transceiver RX 217N250
TX/RX 240~270 5.0W TK»285 (N)M

NO

A personal computer (IBM PC or compatible), programming
interface (KPG-36), and programming software (KPG-62D)

are required for programming.

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

KMC-ZS

(Option)