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VHF FM TRANSCEIVER

TK-760/762/H
SERVICE MANUAL

KENWOOD
1996-5 PRINTED IN JAPAN

B51-8327-00 (N) 1382

TK-760JH

Cabinet (Upper) (AOl-2112-03)

(

"-~-~

Panel assy (A62-0449-13)

Front glass (810-1230-04)

Key top (Rubber) (K29-5081-02)

TK-762/H
Front glass (810-1252-04)

- .. .".. ;m:-

Panel assy (A62-0450-13)

Key top (Rubber) (K29-5081-02)

TK-760/762/H
CONTENTS
GENERAL SYSTEM SET-UP OPERATING FEATURES 1. Transceiver Programming INSTALLATION 1. Accessory Connection Cable (KCT-19 : Option) 2. Ignition Sense Cable (KCT-18 : Option) 3. PA/HA Unit (KAP-1 : Option) 4. DTMF Decode 5. External Speaker 6. Fitting the Control Panel Upside Down REALIGNMENT 1. Modes 2. How To Enter Each Mode 3. Panel Test Mode (TK-760 Only) 4. Panel Tuning Mode (TK-760 Only) BLOCK DIAGRAM LEVEL DIAGRAM CIRCUIT DESCRIPTION 1. Circuit Configuration by Frequency 2. Receiving System 3. Transmitter System 4. Frequency Synthesizer Unit 5. Display Section 6. Control Section SEMICONDUCTOR DATA DESCRIPTION OF COMPONENTS PARTS LIST EXPLODED VIEW PACKING ADJUSTMENT TERMINAL FUNCTION PC BOARD VIEWS I CIRCUIT DIAGRAMS VCO (X58-4360-XX) TX-RX UNIT: TX-RX (X57-4950-XX) (A/2): TK-760 I (X57-5100-XX) (A/2) : TK-762 TX-RX UNIT: CONTROL (X57-4950-XX) (B/2) : TK-760 I (X57-5100-XX) (B/2) : TK-762 KAP-1 (PA/HA UNIT) SPECIFICATIONS 50 51 61 71 BACK COVER 20 20 22 23 24 24 27 31 34 41 42 43 49 : 13 13 13 15 17 19 : 7 9 10 11 12 12 6 : 3 5

2

TK-760/762
GENERAL
INTRODUCTION
SCOPE OF THIS MANUAL This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of the publication data. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as required.

PERSONNEL SAFETY
The following precautions are recommended for personnel safety: DO NOT transmit if someone is within two feet (0.6 meter) of the antenna. 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. All equipment should be properly grounded before power-up for safe operation. This equipment should be serviced by a qualified technician only.

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.

FCC COMPLIANCE AND TYPE NUMBERS
Model and destination
TK-760 TK-760 TK-762 TK-762 TK-760H TK-760H TK-762H TK-762H K K2 K K2 K K2 K K2

Frequency range (MHzl
148-174 136-156 148-174 136-156 148-174 136-156 148-174 136-156

TX

power IW)
25 25 25 25 45 45 45 45

Deviation (kHz)
5/2.5 5/2.5 5/2.5 5/2.5 5/2.5 5/2.5 5/2.5 5/2.5

Signaling OT DOT

2TONE DEC DTMFENC

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

PRE-INSTALLATION CONSIDERATIONS
1. UNPACKING Unpack the radio from its shipping container and check for accessory items. If any item is missing, please contact KENWOOD immediately. 2. L1CI;NSING REQUIREMENTS Federal regulations require a station license for each radio installation (mobile or base) be obtained by the equipment owner. The licensee is responsible for ensuring transmitter power, frequency, and deviation are within the limits permitted by the station license. Transmitter adjustments may be performed only by a licensed 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. However, it is recommended that receiver and transmitter operation 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 installation. Transmitter frequency, deviation, and power output should be checked, as should receiver sensitivity, squelch operation, and audio output. OT equipment operation should be verified.

3

TK-760/762
GENERAL
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 crushing wiring, and radio installation to prevent overheating. 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 system that will best serve your particular needs.

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. 8e 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 installation to prevent wasted time and effort. 2. Connect the positive power lead directly to the vehicle battery positive terminal. Connecting the Positive lead to any other positive voltage source in the vehicle is not recommended.

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 alignment 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 (58) of the accessory connector cable (KCT-19) on the rear of the radio is l3.6V (lA). Insert a 1A fuse if you use the 58 pin for external equipment.

CAUTION If DC power is to be controlled by the vehicle ignition switch, a switching relay should be used to switch the positive power lead. The vehicle ignition switch then controls DC to the relay coil.
3. Connect the ground lead directly to the battery negative terminal. 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. If you do not intend to use the 3.5-mm jack for the external speaker, fit the supplied speaker-jack cap (809-0235-XX) to stop dust and sand getting in.

4

TK-760/762
SYSTEM SET-UP
(
Merchandise received

)

-----.j

Display: LCD 32ch models TK-760/H

Frequency range (MHz) RF power

Type K K2 HK HK2 Type K K2 HK HK2

I I

148-174 136-156 148-174 136-156

25W 25W 45W 45W

( License and frequency allocated by FCC)

Display: LED

Frequency range (MHz) RF power

(

Choose the type of transceiver

'\

./

I I

2ch models TK-762/H

I I

148-174 136-156 148-174 136-156

25W 25W 45W 45W

(

Are you using the signaling? NO

""\ YES

I

./

I

DTMF decoder (Dealer option)

See page 11. Installation the control unit when used IC: LC73881M (SANYO).

I

I
(

Transceiver programming (Option)

I
./

See page 6. A personal computer (IBM PC or compatible), programming interface (KPG-4), and programming software (KPG-29DI are required for programming. (The frequency and signaling (option) data are programmed for the transceiver.)

Are you using the public address? NO

'\ YES

J

I

KAP-l PA/HA unit (Option)

See page 10. Installation the TX-RX unit when used KAP-l.

I
See page 12.

(

Are you using the external speaker? NO

""\ YES

./

I I

KES-3 External speaker (Option)

I
See page 7. ( Are you uSing t h 'Ignition sense ca bl e 7 ./ YES . .. e . ""\ NO See page 9.

~

KCT-19 Accessory connector cable (Option)

I KCT-18 I Ignition sense cable

I

(Option)

(

Delivery

5

TK-760/762
OPERATING FEATURES
1. Transceiver Programming
1-1. Introduction The TK-760/762 transceiver is programmed using an IBM PC or compatible machine, a programming interface (KPG-4), and a programming disk (KPG-29D). Figure 1 shows the setup for an IBM PC.

Communication port (RS-232Cl

Programming disk (KPG-29Dl

Fig. 1

1-2. KPG-4 Description (Optional PC programming interface cable) The KPG-4 is reeded to connect the TK-760/762 to the computer. It has a circuit in the D-subconnector (25-pin) case that converts the RS-232C logic level to TTL level. The KPG-4 plug is connected to external socket of the TK-760/762 and to the computer by a conversion cable (option) with a 9-pin female connector and a 25-pin male connector. 1-3. Programming Software Description KPG-29D is the programming software for the TK760/762, supplied on a 3.5" or 5.25" floppy disk. This software runs under MS-DOS (version 3.3 or later) on an IBM-PC/XT, AT, or PS2, or on a compatible machine. Data can be input to or read from the TK-760/762, and edited on the screen. Programmed data can be printed.

1-4. Data Program Mode In this mode, data is written into the flash memory in the transceiver. When the power is turned on, data program mode can be entered immediately. When the KPG-4 is connected and commands can be received, "PROGRAM" is displayed to indicate that data program mode has been entered. Tuning can be done using an IBM PC and KPG-29D, in the same way as in panel tuning mode. You can carry out panel tuning by selecting test mode on the KPG-29D menu screen and following the instructions on the screen. See the KPG-29D instruction manual for details.

6

TK-760/762
OPERATING FEATURES /INSTALLATION
1-5. Clone Mode (Figure 21 Programmed data is transferred from one transceiver to another by using a microphone cable. 1. Connect the master set to the slave set with but the master set is TK-760 only. 2. Turn the slave set on. 3. Hold down the CH [Tj key, turn the master set on, and keep the CH [Tj key down for two more seconds. "-C-" appears on the display to indicate that clone mode has been entered.]

4. Press the MON key on the master set. The ~ mark appears and data is sent from the master set to the slave set. "-PC-" appears on the slave set to show that it is receiving data. 5. When cloning is complete, the ~ mark on the master set disappears and "-C-" changes to "END". The slave set is automatically reset and enters user mode. If cloning fails, the master set shows "ErrOr". Repeat steps 4 and 5. If you wish to clone several sets, switch each of them on and repeat 4 and 5.

Fig. 2

INSTALLATION 1. Accessory Connection Cable (KCT-19 : Option)
The KCT-19 is an accessory connection cable for connecting external equipment. The connector has 15 pins and the necessary signal lines are selected for use.
1-1. Installing the KCT-19 in the transceiver 1. Remove the upper and lower halves of the transceiver case, and lift the DC cord bushing ( 0) from the chassis. 2. Remove the pad (f) I.

Fig. 1
7

TK-760/762
INSTALLATION
3. Insert the KCT-19 cable (e) into the chassis (0). The wire harness band (0) must be inside the chassis. 4. Relocate the DC cord bushing in the chassis ( 0). 5. Connect the KCT-19 to the TX-RX unit (A/2) as shown in Figure 2 ( 0). 6. Connect the KCT-19 to the external accessory by inserting the crimp terminal ( 9) into the square plug (0), both of which are supplied with the KCT-19.

Fig. 2

1-2. Terminal function
No. (A) A-1 A-2 A-3 A-4 A-5 A-6 A-7 A-S A-9 A-10 A-l1 A-12 A-13 A-14 A-15 No. (B,C.D) 0-2 0-5 0-3 0-1 0-6 B-2 B-3 0-7 0-4 B-1 D-S C-1 E-1 E-2 E-3 Name HK/CHS ME IGN DEO MI E SB PH 01 HOR SO SP AM MM TXS MIC GND Ignition input Detect output MIC input GND DC supply (1A) PH input Data mod input Horn Alert output Squelch output Audio output Audio mute input MIC mute input Signal indicating whether the transceiver is transmitting or not. Function MIC hook input/Channel select KAP-1 Instllated <<<<<<<<
. Refer to Terminal function on page 49, if need description in detail . . Connect CN5 of the radio to connector C of the KCT-19 instead of to the internal speaker connector, if use external speaker.

8

TK-760/762
INSTALLATION
2. Ignition Sense Cable (KCT-18 : Option)
The KCT-18 is an optional cable for enabling the ignition function. The ignition function lets you turn the power to the transceiver on and off with the car ignition key. If you use the Horn Alert function, you can turn the function off while driving with the ignition key. 2-1. Connecting the KCT-18 to the transceiver 1. Install the KCT-19 in the transceiver. (See the KCT19 section.) 2. Insert the KCT-18 lead terminal (f)) into pin 3 of the square plug ( 0) supplied with the KCT-19, then insert the square plug into the KCT-19 connector
(0)

2-2. Modifying the transceiver Modify the transceiver as follows to turn the power or the Horn Alert function on and off with the ignition key. 1. Remove the lower half of the transceiver case. 2. Set jumper resistors (On) R5 and R6 of the TX-RX unit (A/2) as shown in Table 1.

KCT-18

b

Fig. 3

)

)

)

)

)

i;==

Db
~

~

[
0
TX-RX UNIT

"7

\\

~

.

U0

@U
R5
E;]

t~
tM
B
KCT-19

A/2
~

'--

~

0

0

Fu

ANT

R6 [email protected]

~

t1

(011

10
j
Fig. 4

\
Operation when KCT-18 is connected R5 Enable Disable Enable Disable R6 Enable Enable Disable Disable
~ ~

KCT-18 cannot be connected

Power on/off and Horn Alert on/off Horn Alert on/off

Power cannot be turned on

Table 1

R5 and R6 setup chart

The Horn Alert function can be turned on and off only if the function has been assigned to the AUX key.

9

TK-760/762
INSTALLATION
3. PA/HA Unit (KAP-1 : Option)
3-1. Installing the KAP-1 in the transceiver The Horn Alert (max. 2A drive) and Public Address functions are enabled by inserting the KAP-l Wl (3P; white/black/red) into CN4 on the TX/RX unit, inserting W2 (3P: green) into CN201 on the TX-RX unit, and connecting the KCT-19 (option) to CN2 and CN3 of the KAP-l. Installation procedure 1. Open the upper case of the transceiver. 2. Insert the two cables (0) with connectors from the KAP-l switch unit into the connectors on the transceiver. 3. Secure the switch unit board on the chassis with two screws (0) with the notch (f)) in the board placed at the front left side.

Fig. 5
3-2. Modifying the transceiver Horn Alert The signal from pin 62 of IC409 (CPU) on the TX-RX unit turns 013 and 014 on and off and drives KAP-l HA relay K2 to drive the horn with a maximum of 2A. The default output is HR1. The relay open output can be obtained between HRl and HR2 by removing Rl in the KAP-l.
Rl HRl (Default)
Enable

D D Q IZJ D DIZJD

D D

0

HR2

Disable

r ~ r

Output form
HR1

HR1

0
Fig. 6

[] ~
KAP-1 foil side view

~HR2

Public Address The signal from pin 14 of IC10 of the TX-RX unit drives PA relay Kl in the KAP-l and switches the audio power amplifier output between the external PA system (through KCT-19) and internal and external speakers. To use the PA function, RSO on the TX-RX unit must be removed. (See Fig. 7.)
RSO

TX-RX UNIT (A/2) Foil side view

Rso!ID

Use the PA function Do not use the PA function

Disable Enable

10

Fig. 7

TK-760/762
INSTALLATION
3-3. Others If the PA and HR2 are not necessary and the speaker output is output to an external unit through the KCT-19, connect the KCT-19 C connector to CN5 on the TX-RX unit.
TXRX UNIT ----------------------1,
BC

KAp-1 (SWITCH UNIT: X41-3380-20)

IC409 CPU HNC

r6=-2-<:>wrt-I .

I , I , I , I

i
,

~-----------------------~~1

Ql : DTD114EK D1,2' 1SS193

-----------..lr:;] HR2
2 ~ NC

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C~:l
B

t-<>+--.---.----t--"to I SB

IGN >-~.-.-r

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PA1-'1..:...4 IC10 I/O port expansion
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CN2011

I , I , I , I W2,
PNLI SPO SPI

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R3 0 R4 0

.---+----4+0 I PAD/LID
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GRN

KCT-19 Terminal

Audio
power amp

er:

00

r--

Ql

13 10

~;I--+--"""---","*D-, 1 --"90+-.......
C~5

1512

0.000 00000 o 0 0
6 3 6: Earth 10: HRl 12: PA (HR2)

1

.1

C4 0.01
1

,

--------------------

Fig. 8

4. DTMF Decode
If the DTMF decode function, such as code squelch, is necessary, the general-purpose decode IC (LC73881 M: SANYO) must be installed. Installation procedure 1. Remove the upper and lower case and the panel. 2. Solder the IC to the PCB land of the TX-RX unit (control section).

Fig. 9

11

TK-760/762
INSTALLATION
5. External Speaker
5-1. KES-3 : Option The KES-3 is an external speaker for the 3.5-mmdiameter speaker jack. Connection procedure 1. Connect the KES-3 to the 3.5-mm-diameter speaker jack on the rear of the transceiver.

Fig. 10

6. Fitting the Control Panel Upside Down
The TK-760/762 control panel can be fitted upside down, so the transceiver can be mounted with its internal speaker (in the upper half of the case) facing down in your car. 1. Remove the upper and lower case of the transceiver and remove the panel from the main unit ( 0). 2. Remove the flat cable (f) ) and change the direction of bending the flat cable ( 3. Turn the panel over ( 0). insert the flat cable into the main unit (0). Attach the panel to the main unit, and reinstall the cases.

e ).

Fig. 11

Fig. 12
12

TK-760/762
REALIGNMENT
1. Modes
Mode USER MODE USER MODE PANEL TEST MODE PANEL TEST MODE* PANEL TUNING MODE PC MODE Function Customer use this mode. Dealer uses to check the fundamental characteristics. Dealer uses to tune the radio. This mode is communication the radio to PC (IBM compatible). It requires the KPG-29D. PC MODE DATA PROGRAMMING MODE DATA PROGRAMMING MODE This mode is frequency data and features write to the radio and CLONE MODE PC TEST MODE PC TEST MODE PC TUNING MODE read from the radio. This feature is include the FPU. This mode can check the radio by PC control. This feature is include the FPU. This paragraph is as same as PANEL TUNING.

* : TK-760 only
PANEL TUNING MODE*

2. How To Enter Each Mode
Mode USER MODE PANEL TEST MODE PANEL TUNING MODE PC MODE Usually Power ON then begin this mode. The D/A switch is held on with Power ON the radio. The D/A switch holding about 1 sec. after Power ON the radio. But, if this mode is disabled by FPU then begin the USER MODE. The SCAN switch is held on with Power ON the radio. The SCAN switch holdings about 1 sec. after Power ON the radio. But, if this mode is disabled by FPU then begin the USER MODE. The radio Power ON to begin the USER MODE when through to the microphone then begin this mode. Note: PANEL TEST MODE and PANEL TUNING MODE does not begin the PC MODE. Operation

3. Panel Test Mode (TK-760 Only)
When the test mode is entered, all LCD segments light, the beeper sounds for one second, and VERSION SELECT mode is entered. Use the following keys to select a version: D/A key UP SCN key DOWN Table 1 lists the versions. The version is backed up when the CHANNEL DOWN key is pressed.
Version VHF F1 VHF F2 Display 150-1 150-2

All LeD segments appear

~ ~

c(j

CALL SCN AUX ADD

,-, '-I ,-, ,-, ,-, ,-, ,-, ,-,

I "

, , '.' '.'

'.I '.I '.' '.

Version select mode

.---

r--, i

r--l L: (j
',- 0

r---i r---i .---, i

" ,--, ~---;
'---'0

i;

' - - - ' 0 1---'0 ._-- 0

r-1 r-, ---'

J ---,
---'0

Table 1

13

TK-760/762
REALIGNMENT
3-1. TEST MODE CHANNEL operation
When the CHANNEL DOWN key is pressed in the VERSION SELECT mode, the version is backed up and a channel operation begins. The channel frequencies for each version are listed in Table 3, and key functions for channel operations are listed in Table 2.
Key

Function VOL UP VOL DOWN MUTE OFF WIN CH DOWN CH UP SIG DOWN SIG UP TX
,----,

VOL UP VOL DOWN CH UP CH DOWN MON A SCN D/A PTI

Table 2

l'
RF channel

i
Signaling

Frequency table for using on test mode
K
CH 1 RX F (MHzl 161.03000 148.03000 173.97000 155.10000 160.10000 165.10000 150.03000 156.03000 TX F (MHzl 161.00000 148.00000 174.00000 155.10000 160.10000 165.10000 150.00000 156.00000 RX F (MHzl 143.03000 136.03000 149.97000 137.10000 142.10000 147.10000 153.03000 155.97000

K2
TX F (MHz) 143.00000 136.00000 150.00000 137.10000 142.10000 147.10000 153.00000 156.00000

2
3 4 5 6 7 8

Signaling
DEC slgnaling 1 2 3 4 5 6 7 8 9 10 No No OT 67.0Hz OT 151.4Hz OT 210.7Hz DOT 023N No No 2-tone slow DTMF ENC signaling No Rectangular wave OT OT OT DOT 023N DTMF 1633Hz DTMF 852Hz 1209Hz No No 321.7Hz, 928.1Hz CALL flashes if the signal matches. [159DI CALL flashes if the signal matches. Single tone [71 key 100Hz 67.0Hz 151.4Hz 210.7Hz Remarks

Table 3

14

TK-760/762
REALIGNMENT
4. Panel Tuning Mode (TK-760 Only)
When the tuning mode is entered, the TUNING MODE START display appears for about one second, and the VERSION SELECT state becomes effective. This state is different from the VERSION SELECT state in the TEST MODE in that the dot at the lower right side of the display lights. Use the following keys to select a version: D/A key UP SCN key DOWN The version is backed up when the CH DOWN key is pressed as the version select key. When the version is selected with the CH DOWN key, the CH SELECT state of the tuning mode becomes effective. The channel and signaling can be selected in the same way as in the test mode. The tuning items are listed in Tables 5 and 6, and key operations for tuning are listed in Table 4.
Tuning mode start display

[

.'', .-"', r"'; r"'; ; '; r"'; ;----; r"'; ]
L '

t-i i'-f

i~f

i~f

r--i r---f

'---'0 '---'0 '---'0 '---'0 '---'0 1---'0

Tuning mode version select state

DOT

Tuning mode channel select state

,----,

,----,

l'
RF channel

l'
Signaling

,----,

l'
Tuning item

l'
Tuning data

Tuning mode channel select Key VOL UP VOL DOWN CH UP CH DOWN MON AUX SCN D/A PIT VOL up VOL down To tuning N/A CH down CH up SIG down SIG up TX To the right state Function Remarks Key VOL UP VOL DOWN CH UP CH DOWN MON AUX SCN D/A PIT

Tuning mode tuning Function VOL up VOL down To CH SEL Select Item down Item down Adjustment value down Adjustment value up TX To the left state To the next item Remarks

Table 4

15

TK-760/762
REALIGNMENT
Tuning item
Item No. 1 2 2L 2C 2H Tuning description Frequency RF power RF power (Low) RF power (Center) RF power (High) RF low power DOT balance Max deviation Max deviation (Low) Max deviation (Center) Max deviation (High) OT deviation DOT deviation Sensitivity Sensitivity (Low) Sensitivity (Center) Sensitivity (High) Squelch 5L 5C 5H 6 Valid range 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 1-256 Three-point adjustment Low Center High Three-point adjustment Low Center High Three-point adjustment Low Center High KM UHF F1 Remarks

Panel tuning state transition

3 4
5

7
8 8L 8C 8H

9

Table 5

Data save, next item CH DOWN key Next item, previous item
MaN key, A key

Table 6

16

TK-760/i
TX-RX UNIT: TX-RX SECTION (X57-4950-XXl (N2) : TK-760
[:20:
NJM7BL09UA or T.o\76L09F

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(X57-5100-XXl (N2l : TK-762

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1tC407 tlJM78LOSUA I C40a RfiSVt.42C

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- - - - - - - - Center frequency -121c1Bm

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r

455kHz

-""'I (

AF

,.,1

1.5Vrms (High-frequency VTVM)

-113.7c1Bm

-96.7c1Bm

-109.5dBm

-54.6dBm

-65.7dBm

-49.7dBm

0.24Vrms

6.6mVrms

0.45V

ANT

-DL208
-///

L205,206,207

-D-

XF1

SG input level for which a 12dB SINAD are obtained. Measured by connecting the SG to each point via a 0.0015~F capacitor. (Squelch off)
)0

l
AF VTVM

_4Q

1 '///

AF level obtained when the AF output level is adjusted for 0.45V/4Q with the front panel AF VOL control. Measured with AF voltmeter connected to the external speaker jack, receiving a 40dB EMF SSG signal modulated at 1kHz, DEV 3kHz.

m < m

m-

-> J
e
:r:.J

r-

TX Section
1- CONTROL_>!( I ' UNIT
4mVrllls 1.13Vrms 0.047Vrms TX-RX UNIT ) 1_ . POWER ~I_ r-MODULE +5-10dBm
I

C)

:t>
TX-RX---,;>-!

r- UNIT

s:

OdBm

0.4W

IC402 MIC

IC406

MICAMP

r=-~
L

J

-t
VCO (X58-4360-XX) AF VTVM

'"

I
(

High-frequency VTVM

'"

I Wattmeter (terminated by 50n)
(

', 11
,
I I I
//

-I

25W/45W ANT

1. AG is set so that MIC input becomes 3kHz DEV at 1kHz MOD. 2. Transmitting frequency: Center frequency

~ o ~
I\J

~

.............

TK-760/762
CIRCUIT DESCRIPTION
ANT

DET

1st LOCAL OSC (PLL)

IC2 (2/2) AF AMP

IC403 (1/2) LPF

IC403 (2/2) HPF

IC405 (1/2) BEF

0406

IC6

020

IC11 AFPA

SP

VOL UP/DOWN

Fig. 2

Receiving system

2-5. Wide/Narrow switch Each channel can be set as a wide or narrow channel by switching between CF201 : CFWM455F (Wide) and CF202 : CRWM455G (Narrow). The WIDE (high) signal and NARROW (Iow) signal are output from IC10 (I/O port expansion) pin 13. When the WIDE signal is output, 0201 turns off and 0202 turns on. When the NARROW signal is output, 0201 turns on and 0202 turns off.
WIDE:"H" NARROW: "L" 5C C201

A high or low signal is output to 0201 and 0202 to switch between CF201 and CF202. 0204 turns R221 on or off to change the IC7 (IF system) detection output level for WIDE/NARROW.

3 MXI

5 LMI
C202 R55 C61 9 AFO 1-=:...-iWv-....--..n---';> DET 0 UT IC7 IF SYSTEM

'" N

+

U

0204 ----

I

' - - - - - - - - - - - - - - - - - -........- - - - - <

IC10 (I/o port expansion) 13 pin WIDE: "H", NARROW: "L"

Fig. 3

Wide/Narrow switch

21

TK-760/762
CIRCUIT DESCRIPTION
3. Transmitter System
3-1. Microphone amplifier The signal from the microphone goes to the microphone mute switch (0403 off). It then passes through the high-pass filter in IC402 (2/2) and the pre-emphasis/IDC circuit in IC402 (1/2). The signal is applied to the IC404 summing amplifier and mixed with OT and DOT from the CPU (IC409). It then passes through the splatter filter (the fourth lowpass filter) consisting of IC406 (1/2, 2/2), which removes unwanted harmonics. The output from the low-pass filter is input to the D/ A converter (IC6) to adjust the modulation. IC6 changes the deviations of the wide and narrow channels.

Q403

IC402 (2/2)

IC404

From Microphone

D/A Converter IC6

Fig. 4

Microphone amplification

3-2. Final amplifier The signal from the PLL is amplified by drive amplifier (0205, 206) and power module (IC501) to an output level of 25W/45W, and goes through the antenna switch D20 and harmonic filter, and on to the antenna terminal. IC13 (1/2) compares the DC input to pin 2 with the reference voltage at pin 3 applied by IC8 (1/2), amplifies the result, and controls the DC amplifier (022 and 023) to keep the transmit final current constant, thus keeping the transmit output constant.

3-3. APC circuit The direct current that flows through the power module (IC501) produces a voltage across resistors R108. This voltage is applied to pin 6 of IC13 (2/2), and is input as the reference voltage difference of pin 5 and amplified.

D17-1

IC409

Fig. 5

Transmit power circuit and APC circuit

22

TK-760/762
CIRCUIT DESCRIPTION
4. Frequency Synthesizer Unit
4-1. VCO/PLL The PLL generates the transmit signal and the first local oscillator receive signal. The RF signal generated by 05 (TX) or 02 (RX) in the VCO unit is amplified by 03, and the resulting signal is output to the TX-RX unit. TX and RX 05 and 02 are switched by turning the source line for 05 and 02 on and off. This is done by 04 and 01 using the control signal (STR) generated by the serial-to-parallel converter in the TX-RX unit. The RF signal passes through 03 of the VCO unit and amplifier 0209 of the TX-RX unit, and is input to IC202 (PLL IC). The 12.8MHz PLL reference signal generated by the VCXO (X1) in the TX-RX unit is also input to IC202.
Both signals are divided according to the division data from the control unit to produce a 12.5kHz signal. The phases are compared, and a phase difference signal is output and passes through the charge pump (in IC202) and the low-pass filter of the lug lead to produce the control voltage for 05/02 (VCOl. This voltage is applied to D3 and D4 (TX) or D1 and D2 (RX) in the VCO unit to keep the VCO frequency constant. The other output from 03 is amplified by the RF amplifier (018), and output to the transmit or receive unit via the RF switch (D17).

I--'-.......K

f--...-I(---- TX

I I I I I I __________ J

...----1 (---- RX
0209
8R

IC202 PLL r - - -IC - - - - - - -

11

-,
I I I
PLL DATA (CLOCK) (DATA) EP (ENABLE)

1

'--_.....

K~==--'=====::::::::::JCK DT
J

Fig. 6

PLL unit block diagram

4-2. PLL unlock When the PLL is unlocked, the lock detect signal (LD) of the PLL IC (lC202) is rectified by D212, and converted to a DC signal. The CPU monitors this signal. When the PLL is unlocked, the CPU turns the key output signal off (Iowl, then turns 010, 06, and 8T off to prevent unnecessary transmission.

8T

Fig. 7

PLL unlock circuit

23

TK-760/762
CIRCUIT DESCRIPTION
5. Display Section
5-1. 32 channel (LCD) model CPU (lC409) contains an LCD driver to drive the 7segment, 8-digit LCD directly. 5-2. 2 channel (LED) model This model turns LED drive switches 0412 to 0418 on or off in response to the signal from the CPU to light LEDs D412 to D415. TO produce an orange light, the green and red LEDs are turned on at the same time.
r-----'I
I // //
_

GRN

RED

D412

I L

: IMONI

IC409 CPU 0413 MONG 30 CH 1RrrEST 1-"2",-9----t-----' CH1 G 1-'2"'-8_ _--' 0416

LCD
M N

<.9 w
(J)

1 1---1 1 ~

o~

N

I

:2::2: :2: 00 0 uu u
0414 65 0417

S23

~ SO
~ COM2
94 95 COM1 COMO

IC409 0415 CPU 0418

Fig. 8

32 channels model display section

Fig. 9

2 channels model display section

6. Control Section
The control section consists of CPU (lC409) and its peripheral circuits. It controls the TX-RX unit. The CPU has the following main functions: 1) Switching between transmission and reception according to the PTI signal input. 2) Reading channel, frequency, and program data from the memory circuit. 3) Sending frequency data to the PLL. 4) Turning the squelch on and off according to the pulse signal input from the squelch circuit. 5) Controlling the audio mute circuit according to input decode data. 6) Sending encode data. 7) Sending data to the D/A converter.

EN IC401 (2/2) IC2 (2/2) 0420 SOL ES

IC409 CPU
DT 2TN CK EP IC404 TI BIAS TO

Fig. 10
24

Control section block diagram

TK-760/762
CIRCUIT DESCRIPTION
6-1. Memory circuit IC201 is a 8-Kbit EEPROM that stores adjustment and backup data.

Shift register IC10 is an interface IC for I/O port expansion. It is used to expand the CPU (lC409) output ports. 0/A converter IC6 is used as a conventional semi-fixed-resistor converter. It sets the following: 1) RX sensitivity 2) Transmission power 3) Modulation level 4) Audio power 5) Frequency 6-2. TX encode data The CPU (IC409) transmits encode data. aT, DOT, OTMF OT, DOT data items are output from CPU pin 16. The signal from this pin passes through the CR lowpass filter and goes to the summing amplifier (IC404) in the microphone amplifier. DTMF data is output from CPU pin 10. This signal passes through the CR lowpass filter and goes to IC402 in the IDC circuit of the microphone amplifier. These are mixed with the audio signal and output to the splatter filter. It then goes to the D/A converter (lC6) and on to the VCXO and VCO.
6-3. RX decode data aT, DOT The receive detection signal passes through a lowpass filter IC412 (1/2) to remove audio components. This signal is input to pin 4 of the CPU. The CPU digitizes this signal, and decodes the signal.

6-5. Horn control The horn switch, consisting of 013,014, and 024, controls the horn relay. It is supplied by the dealer to provide the external horn alert function. 024 disables horn alert, turning on when its base is high, to inhibit the function. Normally, the output from IC10 is low, and 013 is off; the base of 014 is about OV and 014 is off. When horn alert is enabled, the output from IC10 goes high and 013 turns on. The base current flows through R61 to 014 to turn 014 on. 014 can sink a maximum of 100mA. If the optional KAP-l is used, it can drive up to 2A.
8C

HOR

IC409

cpu

HNC

I

013 ----

R2 IGN O-Wv<0 Cl:

024 R16 I

----

Wv----Q..\~-I

+8

Fig. 11

Horn control circuit

6-6. PA switch If the optional KAP-l is used (see the separate section for details), the PA (Public Address) function becomes available. In this case, the signal flow changes as follows; PA off For TX, 0410 turns on and 0407 turns off. The audio signal from the microphone passes through 0410 and IC6 and modulates the VCO. For RX, the detected signal passes through 0404 which is on. It then passes through the audio filter, IC403, IC405, D/A IC (IC6), and is output to the speaker through the audio power amplifier ICll. PA on Since 0410 is off, 0407 is on, and 0404 is off, the audio signal from the microphone goes to the audio filter IC403, passes through IC6, and goes to ICll. The signal is output to the external PA system through the PA relay in the KAP-l.

2-TONE Th receive detection signal pass through a low-pass filter IC401 (1/2). This signal is input to pin 11 of the CPU. OTMF DTMF decoding is made available by installing the DTMF decode IC (LC73881 M : SANYO) on the control board. 6-4. Pll data output PLL data is output from DATA (pin 60), ENABLE (pin 73), and CLOCK (pin 58) of the CPU (lC209). The signals are input to the PLL IC (IC202) when the channel is changed or when transmission is changed to reception and vice versa.

TK-760/762
CIRCUIT DESCRIPTION
r---------------------------------------,
0410 ICG MIC
>--+-----~l_"\

I

SW""--'
I I I

MOD

~

......JWv
CPU IC409 50 pin (PA)

I I I I I I I I I I
I

ICll AUDIO POWER AMP
DET -+--o--OUT

I I I I I I

r- KAP-l
(OPTION)

SP (INT SP/EXT SPI

L

I I I I I

o-t--;---t-t~

I

PA

J

--------~------------------------Fig. 12 PA switch circuit

I I I I

6-7. Power supply circuit D4 protects IC1 against overvoltage. Each time a pulse comes from the PSW terminal, the IC1 output is reversed. The reversed output signal passes through 01 and 03 and drives 04. A voltage must be applied to the IGN terminal. If 24V is supplied to the transceiver by mistake, 02 turns on, and 03 and 04 are forced off, so the transceiver does not turn on.

IGN

+8

0-----------, 0--_--.....

--~t__-f-__1

S8

PSW

Fig. 13

Power supply circuit

TK-760/762
SEMICONDUCTOR DATA
Microprocessor: M38267M8L156GP (TX-RX Unit IC409)
Terminal connection diagram

512 511 510 59
58

76
77
78

PA
55C KM20 5ELF
D/A

57
56

79 80 81
82

55 54 53 52 51 50

83
84

MON AUX 5CN

85 86
87 88

VLDN VLUP AHK APn
V55
XO XI XCO XCI

VDD VREF
COM2 COM1 COMO

89 90 91 92 93 94

R5T 5MDI
WIN

95
96 97 98 99

VL3 VL2 VL1

MONG CH1R/TE5T CH1G ECK
EDT
Q_N(V')'<:tLn
100

Terminal function
Pin No.
1 2 3 4 5 6 7 8

Port Name
LD BUSY BIAS TI AUXR AUXG CH2R CH2G FSW DTMF 2TN SOL CHDN CHUP 2/32

I/O I
I I I

Function
PLL lock detect. "L": Unlock, "H" : Lock Nor used. OT/DOT center voltage input. OT/DOT signal input. AUX LED (red). "L": On, "H" : Off (TK-762 only) AUX LED (Green). "L": On, 'H' : Off (TK-762 only) CH2 LED (red). "L": On, "H" : Off (TK-762 only) CH2 LED (green). 'L": On, "H" : Off (TK-762 only) TX sense. "L": PTI off, "H" : PTI on DTMF output. 2-tone input. Squelch noise pulse input. CH down. "L": On, "H" : Off CH up. "L": On, "H" : Off CH version. 'L": 32ch, "H" : 2ch OT/DOT PWM output. Normal microphone PTI. "L": On, "H" : Off / DTMF microphone: serial interface. Microphone hook. "L": On hook, 'H" : Off hook

9 10 11 12 13 14 15 16
17 18

0 0 0 0 0 0
I I I I I

TO
PTI HK

0
I/O I

27

TK-760/762
SEMICONDUCTOR DATA
Pin No.
19 20 21

Port Name
TXD RXD 4.19 STD UP/SMRO DN SD EDT ECK CHIG CHIR/TEST MONG WIN SMDI RST XCI XCO XI XO VSS APn AHK VLUP VLDN SCN AUX MON D/A SELF KM20 5SC PA MM AC B1 B2 SCR SMRD COR CK KEY DT ES HNC EP EN S23-S0 VDD VREF COM2-COMO VL3, VL2 VL1

I/O

Function
RS-232C data output. RS-232C data input. DTMF decoder system clock. DTMF decoder STD. "L": DTMF signal absent. "H": DTMF signal present E trunk step pulse / Smartrunk ACK/REO. (TK-760 only) E trunk sync pulse. (TK-760 only) DTMF decoder data. EEPROM serial data. EEPROM serial clock. CH1 LED (green). "L": On, "H" : Off (TK-762 only) CH1 LED (red). "L": On, "H" : Off (TK-762 only) / LCD check mode. "L" : On, "H" : Off (TK-760 only) MON LED (green). "L": On, "H" : Off (TK-762 only) Wide/Narrow. "L": Narrow, "H" : Wide E trunk AUX mute, Smartrunk serial data. (TK-760 only) Reset. Sub clock. Sub clock. Clock. Clock. GND. External pn. "L": On, "H" : Off MDT: DTC. "L": Data CH, "H" : Normal CH. External hook. "L": On hook, "H" : Off hook VOL up. "L": On, "H" : Off VOL down. "L": On, "H" : Off SCN. "L": On, "H" : Off A. "L": On, "H" : Off MON. "L": On, "H" : Off D/A. "L": On, "H" : Off Dealer/Test mode enter. "L" : NG, "H" : OK DTMF microphone pn. "L": Off, "H" : On Smartrunk power supply. "L": Off, "H" : On (TK-760 only) Public address. "L": Off, "H" : On (TK-760 only) Microphone mute. "L": Unmute, "H" : Mute Audio control. "L": Mute, "H" : Unmute Scrambler binary data 1. Scrambler binary data 2. Scrambler. "L": Off. "H" : On Smartrunk data ready. (TK-760 only) E trunk COR. (TK-760 only) Common clock. TX key. "L": TX off, "H" : TX on Common data. Shift register strobe. "L": Load, "H" : Latch Horn control. "L": Off, "H" : On PLL chip select. "L": Select, "H" : Not select D/A converter chip select. "L": Select. "H" : Not select LCD segment 23-0. +5V. +5V. LCD common 2-0.

0
I

0
I

22
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65-88 89 90 91,92 93-95 96, 97 98, 99 100

I
I I I/O

0 0 0/1 0 0
I

-

I I

I
I I
I

I I

I
I

0 0 0 0
I I

0
I

0 0 0 0 0 0 0 0 0
-

0
-

28

TK-760/762
SEMICONDUCTOR DATA
PLL . System: MC145190F (TX-RX UNit IC202)
Terminal connection diagram
1 0 2 3 4 5 6 7 8 9 10 REFout LD 0R 0V Vpo PDout GND Rx TEST1 fin 20 19 18 17 16 15 14 13 12
11

REFin Din CLK ENB OUTPUT A OUTPUT B Voo TEST2 Vcc fin

Block diagram
DATA OUT REFin REFout OSCOR 4-STAGE DIVIDER (CONFIGURABLE) 13-STAGE R COUNTER

fR
PORT SELECT LOGIC 16 OUTPUT A

N

LD CLK SHIFT REGISTER AND CONTROL LOGIC Rx PDout

Din

----l~

ENB 0R 0V OUTPUT B (OPEN-DRAIN OUTPUT)

15

fin _1;...;1

-i
INPUT --l AMP.

1i"fl-'1c.::.O

'--__+L-

----:1..:;.3. TEST2

+-

-.:... 9

TEST1

SUPPLY CONNECTIONS: PIN12= Vcc (V+TO INPUT AMP AND 64/65 PRESCALER) PIN5 = VPo (V+TO PHASE/FREQUENCY DETECTORS A AND B) PIN 14= Voo (V+TO BALANCE OF CIRCUIT) PIN7 = GND (COMMON GROUND)

29