KENWOOD TK780 Service Manual

KENWOOD TK780 Service Manual
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Service Manual for KENWOOD TK780, downloadable as a PDF file.

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B51-8581-00 (N) 1370

VHF FM TRANSCEIVER

TK-780/H

SERVICE MANUAL

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

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

REALIGNMENT ...................................................... 15

INSTALLATION ...................................................... 20

CIRCUIT DESCRIPTION ......................................... 28

SEMICONDUCTOR DATA ..................................... 33

DESCRIPTION OF COMPONENTS ....................... 35

PARTS LIST ............................................................ 37

EXPLODED VIEW .................................................. 47

PACKING ................................................................ 48

ADJUSTMENT ....................................................... 49

PC BOARD VIEWS

PLL/VCO (X58-4540-11) : K2,HK2 .................... 57

PLL/VCO (X58-4712-70) : K,HK ........................ 58

TX-RX UNIT (X57-6480-XX) (A/2) ................... 59

TX-RX UNIT (X57-6480-XX) (B/2) .................... 65

SCHEMATIC DIAGRAM ........................................ 69

BLOCK DIAGRAM .................................................. 77

LEVEL DIAGRAM................................................... 80

TERMINAL FUNCTION ......................................... 82

SPECIFICATIONS................................................... 83

CONTENTS

Microphone

(T91-0621-05)

Cabinet (Top)

(A01-2165-13)

Panel assy

(A62-0991-03)

Key top

(K29-5284-02)

SUPPLEMENT

This service manual applied to products with 30200001 or subsequent serial numbers.

In terms of the products with the serial numbers earier than 30200001, refer to the TK-780/H

service manual as per part No. B51-8461-10.

B51-8581-00 (N) 1370

VHF FM TRANSCEIVER

TK-780/H

SERVICE MANUAL

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

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

REALIGNMENT ...................................................... 15

INSTALLATION ...................................................... 20

CIRCUIT DESCRIPTION ......................................... 28

SEMICONDUCTOR DATA ..................................... 33

DESCRIPTION OF COMPONENTS ....................... 35

PARTS LIST ............................................................ 37

EXPLODED VIEW .................................................. 47

PACKING ................................................................ 48

ADJUSTMENT ....................................................... 49

PC BOARD VIEWS

PLL/VCO (X58-4540-11) : K2,HK2 .................... 57

PLL/VCO (X58-4712-70) : K,HK ........................ 58

TX-RX UNIT (X57-6480-XX) (A/2) ................... 59

TX-RX UNIT (X57-6480-XX) (B/2) .................... 65

SCHEMATIC DIAGRAM ........................................ 69

BLOCK DIAGRAM .................................................. 77

LEVEL DIAGRAM................................................... 80

TERMINAL FUNCTION ......................................... 82

SPECIFICATIONS................................................... 83

CONTENTS

Microphone

(T91-0621-05)

Cabinet (Top)

(A01-2165-13)

Panel assy

(A62-0991-03)

Key top

(K29-5284-02)

SUPPLEMENT

This service manual applied to products with 30200001 or subsequent serial numbers.

In terms of the products with the serial numbers earier than 30200001, refer to the TK-780/H

service manual as per part No. B51-8461-10.

TK-780/H

GENERAL

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 infor-

mation 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 if someone is within two feet (0.6

meter) of the antenna.

· 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.

· All equipment should be properly grounded before

power-up for safe operation.

· This equipment should be serviced by only qualified tech-

nicians.

PRE-INSTALLATION CONSIDERNATIONS

1. UNPACKING

Unpack the radio from its shipping container and check

for accessory items. If any item is missing, please contact

KENWOOD immediately.

2. LICENSING REQUIREMENTS

Federal regulations require a station license for each ra-

dio installation (mobile or base) be obtained by the equip-

ment owner. The licensee is responsible for ensuring trans-

mitter power, frequency, and deviation are within the limits

permitted by the station license.

Transmitter adjustments may be performed only by a li-

censed technician holding an FCC first, second or general

class commercial radiotelephone operator's license. There

is no license required to install or operate the radio.

3. PRE-INSTALLATION CHECKOUT

3-1. Introduction

Each radio is adjusted and tested before shipment. How-

ever, it is recommended that receiver and transmitter opera-

tion be checked for proper operation before installation.

3-2. Testing

The radio should be tested complete with all cabling and

accessories as they will be connected in the final installa-

tion. Transmitter frequency, deviation, and power output

should be checked, as should receiver sensitivity, squelch

operation, and audio output. QT equipment operation

should be verified.

4. PLANNING THE INSTALLATION

4-1. General

Inspect the vehicle and determine how and where the

radio antenna and accessories will be mounted.

Plan cable runs for protection against pinching or crush-

ing wiring, and radio installation to prevent overheating.

4-2. Antenna

The favored location for an antenna is in the center of a

large, flat conductive area, usually at the roof center. The

trunk lid is preferred, bond the trunk lid and vehicle chassis

using ground straps to ensure the lid is at chassis ground.

4-3. Radio

The universal mount bracket allows the radio to be

mounted in a variety of ways. Be sure the mounting surface

is adequate to support the radio's weight. Allow sufficient

space around the radio for air cooling. Position the radio

close enough to the vehicle operator to permit easy access

to the controls when driving.

4-4. DC Power and wiring

1. This radio may be installed in negative ground electrical

systems only. Reverse polarity will cause the cable fuse

to blow. Check the vehicle ground polarity before installa-

tion to prevent wasted time and effort.

2. You must connect the positive power lead directly to

the positive terminal of the vehicle battery. Never

connect the lead to any other positive power source,

such as a cigarette lighter jack or fuse terminals.

CAUTION

If DC power is to be controlled by the vehicle ignition

switch, a switching relay should be used to switch the posi-

tive power lead. The vehicle ignition switch then controls

DC to the relay coil.

3. You must also connect the ground lead directly to

the negative terminal of the vehicle battery.

4. The cable provided with the radio is sufficient to handle

the maximum radio current demand. If the cable must be

extended, be sure the additional wire is sufficient for the

current to be carried and length of the added lead.

TK-780/H

5. INSTALLATION PLANNING CONTROL STATIONS

5-1. Antenna system

Control station. The antenna system selection depends

on many factors and is beyond the scope of this manual.

Your KENWOOD dealer can help you select an antenna sys-

tem that will best serve your particular needs.

5-2. Radio location

Select a convenient location for your control station radio

which is as close as practical to the antenna cable entry

point. Secondly, use your system's power supply (which

supplies the voltage and current required for your system).

Make sure sufficient air can flow around the radio and power

supply to allow adequate cooling.

SERVICE

This radio is designed for easy servicing. Refer to the

schematic diagrams, printed circuit board views, and align-

ment procedures contained in this manual.

Note

When you modify your radio as described in system set-

up, take the following precaution.

The rating of pin 7 (SB) of the accessory connector cable

(KCT-19) on the rear of the radio is 13.6V (1A). Insert a 1A

fuse if you use the SB pin for external equipment.

Accessory connector

cable (KCT-19)

If you do not intend to use the 3.5-mm jack for the exter-

nal speaker, fit the supplied speaker-jack cap (B09-0235-05)

to stop dust and sand getting in.

GENERAL / OPERATING FEATURES

Speaker-jack cap

(B09-0235-05)

1. Operation Features

The TK-780/780H is a VHF FM radio designed to operate

in both trunking format (LTR model) and conventional for-

mat (Conventional model). The programmable features are

summarized.

Model

Trunking format

Trunking mode

Conventional format

Conventional mode

1-1. Trunking Format

This format 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.

1-2. Conventional Format

This format can handle up to 250 groups with 250 chan-

nels in each group. The transceiver can be used only in con-

ventional mode. Groups, channels, and their functions are

programmed.

2. Transceiver Controls and Indicators (Fig. 1)

2-1. Front Panel Controls

All the keys on the front panel are momentary-type push

buttons. The functions of these keys are explained below.

· POWER key

Transceiver POWER key. When the power is switched

off, all the parameters, such as the system and group in

trunking format, and the group and channel in conventional

format, are stored in memory. When the power is switched

on again, the transceiver returns to the previous conditions.

· SYSTEM UP/DOWN key

(Trunking format, programmable)

· GROUP UP/DOWN key

(Conventional format, programmable)

· SCAN key (Programmable)

· MONITOR key (Programmable)

· A, B, C and D key (Programmable)

· VOLUME UP/DOWN key (Programmable)

· BUSY/TX LED

The BUSY indicator (Green LED) shows that the channel

is in use. The TX indicator (Red LED) shows that you are

transmitting.

TK-780/H

2-2. Programmable Keys

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

lect the following functions.

s Conventional format

AUX-A, AUX-B (Only when voice scrambler is not se-

lected), Channel down, Channel up, DTMF ID (BOT), DTMF

ID (EOT), Display character, Emergency (Only foot key),

Function, Group down, Group up, Home channel, Horn alert,

Key lock, Memory (RCL/STO), Memory (RCL), Memory

(STO), Monitor A, Monitor B, Monitor C, Monitor D, Opera-

tor selectable tone, Public address, Redial, Scan, Scan del/

add, Scrambler (Only when voice scrambler is selected),

Talk around, Volume down, Volume up and None.

s Trunking format

Auto tel, AUX-A, AUX-B (Only when voice scrambler is

not selected), DTMF ID (BOT), DTMF ID (EOT), Display char-

acter, Emergency (Only foot key), Function, Group down,

Group up, Home group, Horn alert, Key lock, Memory (RCL/

STO), Memory (RCL), Memory (STO), Monitor A, Monitor B,

Monitor C, Monitor D, Public address, Redial, Scan, Scan

del/add, Scan temporary delete, Scrambler (Only when

voice scrambler is selected), System down, System up, TEL

disconnect, Volume down, Volume up and None.

These functions the FPU programs to the function keys

and described in the following sections.

· Auto TEL (Trunking format)

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.

· AUX-A

If this key is pressed, "AUX" icon lights on the LCD and

AUX port which is inside of the transceiver turns to the high

level. If pressed again, the "AUX" icon goes off and the

AUX ports turns to the lower level.

· AUX-B

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.

· Channel up/down (Conventional format)

When the key is pressed each time, the channel number

to be selected is incremented/decremented and repeats if

held for one second or longer. This key works as the voice

scrambler code selector in the voice scrambler code select

mode.

OPERATING FEATURES

· DTMF ID (BOT)

In conventional mode, if you press this key, a predeter-

mined DTMF ID (Begin of TX) will be sent automatically.

· DTMF ID (EOT)

In conventional mode, if you press this key, a predeter-

mined DTMF ID (End of TX) will be sent automatically.

· Display character

This key switches the LCD display between the system

and group number in trunking format and the group and

channel name in conventional format.

· 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 and group in trunking format

and the group and channel in conventional format" 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.

· Function

Pressing this key causes the transceiver to display

"FCN". Then, pressing a microphone DTMF key causes the

corresponding programmed function to start. This key may

be convenient when using many functions with the micro-

phone 12-key keypad.

· 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 channel (Conventional format)

Press this key once, the channel switches to the pre-pro-

grammed home channel.

· Home group (Trunking format)

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

· Horn alert

If you are called from the base station using 2-tone/DTMF

while you are away from your transceiver, you will be

alerted by the vehicle horn or some other type of external

alert. To turn the horn alert function on , press this key. A

confirmation tone sounds, and the display shows "HA" on

the sub LCD.

If this key is pressed again, the horn alert function is

turned off.

· Key lock

Pressing this key causes the transceiver to accept entry

of only the [Function], [Key lock], [PTT], [Monitor A], [Moni-

tor B], [Monitor C], [Monitor D], and [Emergency] keys.

TK-780/H

· Message mode

Press this key to enter the message mode. (See "Alpha-

numeric Two-way Paging Function" for details)

· 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.

· Operator selectable tone (Conventional format)

This key switches the pre-set decode QT/DQT and en-

code QT/DQT to OST (Operator Selectable Tone) tone pair.

Press this key, the transceiver enters to OST select

mode. In this mode, the display shows "OFF" and the op-

erator can select one of the OST tone pair using the group

up/down key. The display shows "TONE

**" and tone

pair No.

** is selected.

Press OST key again, the transceiver exits from the OST

select mode, and returns to the group/channel mode with

the handset indicator ( ). The handset indicator ( ) means

that the OST tone pair is selected. OST tone pair number or

OFF can be memorized for each channel.

16 kinds of tone pair for OST can be programmed by

KPG-49D. OST is useful to access the repeater with same

radio frequency and different tone (QT/DQT).

· Public address

Public address amplifies the microphone audio, and out-

puts it through a PA speaker. PA is activated by pressing

this key. A confirmation tone sounds, and the display shows

"PUBLIC ADRS". PA can be activated at anytime (scanning

or non-scanning).

The RADIO continues to scan & receive calls while in PA

mode. Pressing PTT activates PA, and will override an in-

coming call at anytime; however, no RADIO transmission

takes place.

If this key is pressed again, a confirmation tone will

sound, the display will return to the normal channel or SCAN

display, and the PA function will turn off.

· Redial

If you press this key when the system/group (Trunking

format) or group/channel (Conventional format) is displayed,

the last transmitted DTMF code will appear on the display.

Pressing the PTT switch at this time will transmit the dis-

played DTMF code.

· Scan

Press this key starts scanning. Pressing this key stops

scanning.

· Scan del/add

1) Trunking format

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.

2) Conventional format

This key switches the currently displayed channel be-

tween "Delete" and "Add".

The "Add" channel contained in the scan sequence, and

"Delete" channel is not contained. In the scan mode, this

key switches the channnel delete or add temporarily.

· Scan temporary delete (Trunking format)

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".

· Scrambler

If a scrambler code (1 to 16) 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. Press this key for 2 seconds

to enter scrambler code selection mode.

· Send GPS (Optional)

Pressing this key causes the transceiver to send a single

GPS data. (GPS receiver must be installed.)

· System up/down (Trunking format)

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.

· Talk around (Conventional format)

Press this key, the transceiver uses the receive fre-

quency and the tone for transmission.

The operator can call the other party directory (without

repeater). Press this key again, the talk around function

goes off.

· Telephone disconnect (Trunking format)

Pressing this key ends an RIC connection (disconnects

the telephone line).

· Volume up/down

When the key is pressed, the volume level is increased/

decreased and repeats if held for 200ms or longer.

· None

Sounds error operation beep, and no action will occur.

Use this function when the transceiver is required to be

more simple operated.

OPERATING FEATURES

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