Kenwood TK-760 User manual

KENWOOD TK-760/762/H SERVICE MANUAL
http://www.manuallib.com/file/2593611
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(
VHF FM TRANSCEIVER
TK-760/762/H
SERVICE MANUAL
TK-760JH
Cabinet (Upper)
(AOl-2112-03)
Panel assy Front glass
(A62-0449-13) (810-1230-04)
TK-762/H
KENWOOD
©1996-5 PRINTED IN JAPAN
B51-8327-00 (N) 1382
"-~-~
Key top (Rubber)
(K29-5081-02)
Front glass
(810-1252-04)
- .. ." .. ;m:-
Panel assy
(A62-0450-13)
Key top (Rubber)
(K29-5081-02)
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TK-760/762/H
CONTENTS
GENERAL 3
SYSTEM SET-UP : 5
OPERATING FEATURES
1. Transceiver Programming 6
INSTALLATION
1. Accessory Connection Cable (KCT-19 : Option) 7
2. Ignition Sense Cable (KCT-18 : Option) 9
3. PA/HA Unit (KAP-1 : Option) 10
4. DTMF Decode : 11
5. External Speaker 12
6. Fitting the Control Panel Upside Down 12
REALIGNMENT
1.
Modes 13
2. How To Enter Each Mode 13
3. Panel Test Mode (TK-760 Only) 13
4. Panel Tuning Mode (TK-760 Only) 15
BLOCK
DIAGRAM 17
LEVEL DIAGRAM :19
CIRCUIT DESCRIPTION
1.
Circuit Configuration by Frequency 20
2. Receiving System 20
3. Transmitter System 22
4. Frequency Synthesizer Unit 23
5. Display Section 24
6. Control Section 24
SEMICONDUCTOR DATA
27
DESCRIPTION OF COMPONENTS 31
PARTS LIST 34
EXPLODED VIEW
41
PACKING 42
ADJUSTMENT 43
TERMINAL FUNCTION 49
PC BOARD VIEWS ICIRCUIT DIAGRAMS
VCO (X58-4360-XX)
50
TX-RX UNIT: TX-RX (X57-4950-XX) (A/2): TK-760 I(X57-5100-XX) (A/2) :TK-762 51
TX-RX UNIT: CONTROL (X57-4950-XX) (B/2) :TK-760 I(X57-5100-XX) (B/2) :TK-762 61
KAP-1 (PA/HA UNIT) 71
SPECIFICATIONS BACK COVER
2
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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 re-
quired 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 re-
quired.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment in-
formation, 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 apart, and asuffi-
cient description
of the required component for proper
identification.
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 termi-
nated.
•SHUT
OFF and DO NOT operate this equipment
near electrical blasting caps or in an explosive at-
mosphere.
•All equipment should
be properly grounded before
power-up for safe operation.
•This equipment should be serviced by aqualified
technician only.
FCC COMPLIANCE AND TYPE NUMBERS
Model and Frequency TX Deviation Signaling
destination range (MHzl
power IW)
(kHz) OT DOT
2·TONE DEC
DTMFENC
TK-760 K
148-174
25 5/2.5 00 0 0
TK-760
K2
136-156
25 5/2.5 00 0 0
TK-762 K
148-174
25
5/2.5 0 0 0 0
TK-762
K2
136-156
25
5/2.5 0 0 0 0
TK-760H K 148-174
45 5/2.5 0 0 0 0
TK-760H
K2
136-156
45 5/2.5 0000
TK-762H K 148-174
45 5/2.5 0 0 00
TK-762H
K2
136-156
45 5/2.5 0 0 00
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 astation license for each
radio installation (mobile or base)
be obtained by the
equipment owner. The licensee
is responsible for en-
suring transmitter power, frequency,
and deviation are
within the limits permitted by the station license.
Transmitter adjustments may
be performed only by
alicensed technician holding
an FCC first, second or
general class commercial radiotelephone operator's
li-
cense. 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 trans-
mitter operation
be checked for proper operation be-
fore 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
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TK-760/762
GENERAL
4
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 over-
heating.
4-2. Antenna
The favored location for
an antenna is in the center
of alarge, flat conductive area, usually at the roof cen-
ter. 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 avariety of ways. 8e sure the mounting
surface
is adequate to support the radio's weight. Al-
low 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 elec-
trical systems only. Reverse polarity will cause the
cable fuse to blow. Check the vehicle ground polar-
ity before installation to prevent wasted time
and
effort.
2. Connect the positive power lead directly to the ve-
hicle battery positive terminal. Connecting the Posi-
tive lead to any other positive voltage source
in the
vehicle
is not recommended.
CAUTION
If DC power is to be controlled by the vehicle ignition
switch, aswitching 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.
5. INSTALLATION PLANNING -CONTROL STATIONS
5-1. Antenna system
Control station. The antenna system selection de-
pends
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.
5-2. Radio location
Select aconvenient 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.
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.
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SYSTEM SET-UP
TK-760/762
(
Merchandise received )
Display: LCD
Frequency range (MHz) RF power Type
148-174 25W K
-----.j 32ch models I
136-156 25W
K2
TK-760/H I
148-174 45W HK
(License and
frequency allocated by FCC)
136-156 45W HK2
Display: LED
Frequency range (MHz) RF power Type
148-174
25W K
I2ch models I
(Choose
the type of transceiver
'\
136-156
25W K2
./
ITK-762/H I
148-174 45W
HK
136-156 45W HK2
(Are
you using the signaling?
""\ YES
ISee page 11.
./
IDTMF decoder Installation
the control unit
when used IC: LC73881M (SANYO).
NO I(Dealer
option)
ITransceiver
programming
ISee page 6.
(Option) Apersonal
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?
'\ YES
JKAP-l See page 10.
./
IPA/HA
unit
Installation the TX-RX unit
when used KAP-l.
NO I(Option)
See page 12.
(Are you using
the external speaker?
""\ YES
IKES-3
./
IExternal speaker
NO I(Option)
See page
7. See page 9.
~ KCT-19 IKCT-18 I
( . h' .. bl 7 ""\ YES
I Ignition sense cable
Are you uSing t e Ignition sense ca e. ./
Accessory connector cable
NO (Option) (Option)
(Delivery
5
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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, aprogramming inter-
face
(KPG-4), and aprogramming disk (KPG-29D). Fig-
ure 1shows the setup for an IBM PC.
6
Programming disk (KPG-29Dl
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 acircuit 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 a9-pin female connec-
tor and a25-pin male connector.
1-3. Programming Software Description
KPG-29D is the programming software for the TK-
760/762, supplied on a3.5" 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 acompatible machine.
Data
can be input to or read from the TK-760/762, and
edited on the screen. Programmed data can be
printed.
Fig. 1
Communication port (RS-232Cl
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.
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TK-760/762
OPERATING FEATURES /INSTALLATION
1-5. Clone Mode (Figure 21
Programmed data is transferred from one trans-
ceiver to another by using amicrophone 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 sec-
onds. "-C-" appears on the display to indicate that
clone mode has been entered.]
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 trans-
ceiver case, and lift the
DC cord bushing ( 0) from
the chassis.
2. Remove the pad (f) I.
Fig. 2
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 mas-
ter 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".
Re-
peat steps 4and 5.
If you wish to clone several sets, switch each of
them on and repeat 4and 5.
Fig. 1
7
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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 in-
serting 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)
No. (B,C.D) Name Function
KAP-1 Instllated
A-1 0-2 HK/CHS MIC hook input/Channel select <-
A-2 0-5 ME MIC GND <-
A-3 0-3
IGN Ignition input
<-
A-4 0-1
DEO Detect output <-
A-5 0-6 MI MIC input <-
A-6 B-2
EGND <-
A-7 B-3
SB
DC supply (1A)
<-
A-S 0-7
PH PH input <-
A-9 0-4
01 Data mod input <-
A-10 B-1
HOR Horn Alert output HR1
A-l1 D-S
SO Squelch output <-
A-12 C-1
SP Audio output PNHR2
A-13
E-1
AM Audio mute input <-
A-14 E-2
MM MIC mute input <-
A-15 E-3
TXS Signal indicating whether the transceiver is transmitting or not. <-
.Refer to Terminal function
on page 49, if need description in detail.
.Connect CN5 of the radio to connector Cof the
KCT-19 instead of to the internal speaker connector, if use external
speaker.
8
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TK-760/762
INSTALLATION
2. Ignition Sense Cable (KCT-18 :Option)
The KCT-18 is an optional cable for enabling the igni-
tion 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 KCT-
19 section.)
2. Insert the KCT-18 lead terminal (f)) into pin 3of the
square plug (0) supplied
with the KCT-19, then in-
sert
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.
Fig. 3b
KCT-18
ANT
) ) ) ) )
i;==
Db
"7 \\
[
~
~
~
.
U0
0
@U
t~
TX-RX UNIT
A/2
'--
~
R5
~
00
E;]
tM Fu
B
R6
KCT-19
~@
~ t®1
(011
10
\j
Fig. 4
Operation when KCT-18 is connected R5 R6
Enable Enable
Power on/off and Horn Alert on/off Disable Enable
Horn Alert on/off Enable Disable
Disable Disable
~ KCT-18 cannot be connected
~ 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
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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 con-
necting 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 trans-
ceiver.
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.
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 amaximum 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
Output form
HRl (Default) Enable r HR1
~
HR2
Disable r
HR1
~HR2
Fig. 5
D0
D
D
Q
IZJ
D
D
DIZJD
0
[] ~
Fig. 6KAP-1 foil side
view
•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 sys-
tem (through KCT-19) and internal and external speak-
ers.
To use the PA function, RSO on the TX-RX unit must
be removed. (See Fig. 7.)
RSO
Use the PA function Disable
Do not use the PA function Enable
10
TX-RX UNIT (A/2)
Foil side view
Fig. 7
Rso!ID
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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 Cconnector to CN5 on
the TX-RX unit.
GRN
c
B
KCT-19 Terminal
13 10 1
0.000
00000
o • 0 • 0
1512 6 3
6: Earth
10: HRl
12: PA (HR2)
.---+----4+0 IPAD/LID
E
C4 0.01
,
1 --------------------
KAp-1 (SWITCH UNIT: X41-3380-20)
~-----------------------~~1
i Ql :DTD114EK -----------..lr:;] HR2
, D1,2' 1SS193 2 ~ NC
I K2'
~I srB C~:l
t-<>+--.---.----t--"toI SB
<L
0
,uI§
I
,
I
R3 0
,
I
R4 0
,
,I
CN2011
Ql
W2,
r--
PNLI
SPO
SPI
o
00
er:
BC
IC409
CPU
HNCr6 =-2 -<:>wrt-I .
PA1-'1..:...4 --,
IC10
I/O port
expansion
IGN >-~.-.-r
TX·RX UNIT
----------------------1
,
I
,
I
,
I
,
I
Audio
power amp
~;I--+--"""---","*D-, 1--"90+- .......
C~5 .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 (con-
trol section).
Fig. 9
11
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TK-760/762
INSTALLATION
5. External Speaker
5-1. KES-3 :Option
The KES-3 is an external speaker for the 3.5-mm-
diameter 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 inter-
nal 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 (e ).
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.
12
Fig. 11
Fig. 12
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TK-760/762
REALIGNMENT
1. Modes
USER MODE
PANEL TEST MODE*
PANEL TUNING MODE*
PC MODE
CLONE MODE
* :TK-760 only
DATA PROGRAMMING MODE
PC TEST MODE
PC TUNING MODE
Mode Function
USER MODE Customer use this mode.
PANEL
TEST MODE Dealer uses to check the funda-
mental characteristics.
PANEL TUNING MODE Dealer uses to tune the radio.
PC MODE This mode is communication the
radio to
PC (IBM compatible).
It requires the KPG-29D.
DATA PROGRAMMING MODE This mode
is frequency data and
features write to the radio and
read from the radio.
This feature
is include the FPU.
PC TEST MODE This mode can check the radio by
PC control. This feature is include
the
FPU. This paragraph is as
same as PANEL TUNING.
2. How To Enter Each Mode
Mode Operation
USER MODE Usually Power ON then begin this mode.
PANEL
TEST MODE The D/A switch is held on with Power ON the radio. The D/A switch holding about 1sec. after Power ON the
radio. But, if this mode
is disabled by FPU then begin the USER MODE.
PANEL TUNING MODE The SCAN switch
is held on with Power ON the radio. The SCAN switch holdings about 1sec. after Power ON
the radio. But, if this mode is disabled by FPU then begin the USER MODE.
PC 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.
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 aversion:
D/A key
UP
SCN key DOWN
Table 1lists the versions. The version
is backed up
when the CHANNEL DOWN key
is pressed.
Version Display
VHF
F1 150-1
VHF F2 150-2
Table 1
All LeD segments appear
~ ~ c(j CALL SCN AUX ADD
,-, '-I ,-, ,-, ,-, ,-, ,-, ,-,
I " , ,'.' '.' '.I '.I '.' '.
Version select mode
r--l L: (j r---i r---i .---, iJ ---,
r--, i " ,--, ~---; i; r-1 r-, ---'
.--- '- ,- 0 '---'0 '---'0 1---'0 ._-- 0 ---'0
13
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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
achannel 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 UP
VOL DOWN VOL DOWN
CH UP
MUTE OFF
CH DOWN WIN
MON
CH DOWN
A
CH UP
SCN
SIG DOWN
D/A
SIG UP
PTI TX
,----,
Table 2
Frequency table for using on test mode
K K2
CH RX F(MHzl TX F(MHzl RX F(MHzl
TX F(MHz)
1161.03000 161.00000 143.03000 143.00000
2148.03000 148.00000 136.03000 136.00000
3173.97000 174.00000 149.97000 150.00000
4155.10000 155.10000 137.10000 137.10000
5160.10000 160.10000 142.10000 142.10000
6165.10000 165.10000 147.10000 147.10000
7150.03000 150.00000 153.03000 153.00000
8156.03000 156.00000 155.97000 156.00000
Signaling
DEC slgnaling ENC signaling Remarks
1No No
2No Rectangular wave 100Hz
3OT 67.0Hz
OT
67.0Hz
4OT 151.4Hz
OT
151.4Hz
5
OT 210.7Hz OT 210.7Hz
6DOT 023N DOT 023N
7No DTMF 1633Hz Single tone
8No DTMF 852Hz
[71 key
1209Hz
92-tone
slow
No 321.7Hz, 928.1Hz
CALL flashes if the signal matches.
10 DTMF No [159DI
CALL flashes if the signal matches.
Table 3
14
l'
RF channel
i
Signaling
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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 aversion:
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 be-
comes effective.
The channel and signaling
can be selected in the
same way
as in the test mode.
The tuning items are listed
in Tables 5and 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 Tuning mode tuning
Key Function Remarks
Key
Function Remarks
VOL
UP
VOL up
VOL UP VOL up
VOL DOWN VOL down VOL DOWN VOL down
CH UP To tuning
To the right state
CH UP To CH SEL To the left state
CH DOWN N/A
CH DOWN Select To the next item
MON
CH down MON Item down
AUX
CH up
AUX Item down
SCN SIG down
SCN Adjustment value down
D/A
SIG up
D/A Adjustment value
up
PIT TX
PIT
TX
Table 4
15
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TK-760/762
Tuning item
REALIGNMENT
Panel tuning state transition
Item No.
Tuning description
Valid range Remarks
1Frequency
1-256
2
RF power
1-256 Three-point adjustment
2L
RF power (Low)
1-256
Low
2C
RF power (Center) 1-256
Center
2H RF power (High)
1-256
High
3
RF low power 1-256 KM UHF F1
4DOT balance
1-256
5Max deviation
1-256 Three-point adjustment
5L Max deviation (Low)
1-256 Low
5C Max deviation (Center)
1-256 Center
5H Max deviation (High)
1-256 High
6OT deviation
1-256
7DOT deviation
1-256
8Sensitivity
1-256 Three-point adjustment
8L Sensitivity (Low)
1-256 Low
8C Sensitivity (Center)
1-256 Center
8H Sensitivity (High)
1-256 High
9Squelch
Table 5
16
Data save, next item
CH DOWN key
Next item, previous item
MaN key, Akey
Table 6
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TK-760/i
E
TX-RX UNIT: TX-RX SECTION (X57-4950-XXl (N2) :TK-760 (X57-5100-XXl (N2l :TK-762
[:20:
NJM7BL09UA or T.o\76L09F
lSS
f \
I
I,
!:20L 0202
DAN202K
Q201
:JT ..... 14-4-EK
~-?~l44EK 2SC
r FM Jp r
I SY S,l':M 1'E-----l
-L'E se
°X2
14.4. 595Mlh
RST
DET
I
I
1
I
I
I
1
I
I
snl;...-~~
ICI':'
TA75S01F
Q15 "'AI (SUB UNIT)
2SCHUiCGR) _
9~
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0204
07;:14-103:<
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,y
tC407 I C40a
tlJM78LOSUA RfiSVt.42C
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I
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Q8
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ColD r:~C! 14EU
BC
L-"»BC
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CK -,,:;..:.~===:;...--,,> A-~
DT PA
E5 T~
ICB(2/2)
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~
I I~~~~~~~
I .iEUFFl.
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DTA~14£U
lUN-4 g; H ~~ I
Q3
DT:U·U:U
~
psw -""L.!:.U
ICl
5U4013BF
TX-RX UNIT 1-
:CONTROL SECTION
(X57-4950-XXl lB/2l :TK-760
0::: 13.6V +
!NT
1 C406 I C4C':'
:--:J"I.:.55eE ":".~.75.5C I;
L
r
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111
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MICRO
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7( Is~~lc-
fT
Dl TO
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sw.
TI
BIAS
BUSY
,
0.408 DTA144!:X
Q404 DTAI14T:-:.
Q407 DT.=..: 1.:.7:<
Q4'0 DTAl1<.T:<
0402 25J203
IC401. tlJH455BE
(1/2) 2TN
L-..E.DE~O,--+--_--">l LPF ~-------_---":=3>I
::2
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...
to
RX Section
-------- Center frequency "'I( 45.05MHz )r455kHz -""'I (AF ,.,1
-121c1Bm 1.5Vrms
(High-frequency VTVM)
-113.7c1Bm -96.7c1Bm
-109.5dBm
-54.6dBm -65.7dBm
-49.7dBm 0.24Vrms 6.6mVrms
0.45V
m-
m
<
m
r-
e
-
J>
C)
:r:.J
:t>
s:
_4Q
l
1'///
AF VTVM
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 a40dB EMF SSG signal
modulated at 1kHz, DEV 3kHz.
XF1
)0
SG input level for which a12dB SINAD are obtained.
Measured by connecting the SG to each point via
a
0.0015~F capacitor. (Squelch off)
-D-
L205,206,207
L208
-D-
1- CONTROL_>!( TX-RX UNIT ) 1_ .POWER ~I_ TX-RX---,;>-!
I' UNIT r-MODULE r- UNIT
-///
ANT
TX Section
1. AG is set so that MIC input becomes 3kHz DEV at 1 kHz MOD.
2. Transmitting frequency: Center frequency
-I
~
~
o
.............
~
I\J
I
,
I
11
'25W/45W
ANT
I
,
//
0.4W
+5-10dBm
I
-t<J-
D17
LJ
VCO
(X58-4360-XX)
AF VTVM I
High-frequency VTVM I Wattmeter (terminated by 50n)
'" ( '" (
0.047Vrms OdBm
r=-~
1.13Vrms
MICAMP
IC402 IC406
4mVrllls
MIC
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TK-760/762
CIRCUIT DESCRIPTION
ANT
DET 1st LOCAL OSC (PLL)
IC2 (2/2) IC403 (1/2) IC403 (2/2) IC405 (1/2)
AF AMP LPF HPF BEF 0406
IC6 020
IC11
AFPA SP
VOL UP/DOWN
Fig. 2Receiving 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 out-
put, 0201 turns on and 0202 turns off.
Ahigh 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) detec-
tion output level for WIDE/NARROW.
'" +
<D
N
U
0204
----
I
IC7
IF SYSTEM
3MXI
5LMI
R55 C61
AFO 1-=
9
:...-iWv-....-- .. n·---';> DET 0UT
C201
C202
IC10 (I/o
port expansion)
'------------------ ........ -----< 13 pin
WIDE: "H", NARROW: "L"
WIDE:"H"
NARROW: "L"
5C
Fig. 3 Wide/Narrow switch
21
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