Kenwood TKR-820 User manual

SERVICE MANUAL
© 1990-3 PRINTED IN JAPAN
B51-8050-00 (O) 1403
REVISED
Panel
Case
(Upper)
Dressing
plate
Knob
(TAKE
OVER,
REPEAT,
MONI)
(A20-2666-11)}
(A01-1059-01)
(A21-1519-03)
(K29-3148-04)
x
3
Knob (POWER) Foot Knob (VOL, SQL) Dressing plate Rectangular receptacle (MIC)
(K29-31 46-04) (J02-0049-14) x 4 (K29-3147-03) x 2 (A21-1520-03) (E08-0673-05)
CONTENTS
GENERAL
.........ccccsceececeeesseesesscecescsencerceeeuserssseceeneestes
2
RX
VCO
:
Z2
(X58-3150-XX)
wesscseccecesseecnsenssrseesene
63
SYSTEM
SET-UP
.........:sscscessscstsrnssssccuseseserenseeseers
4
TX
VCO
:
Z5
(X58-B460-XX)
....eecreeceseersseessnsscereue
64
INSTALLATION
......0..cceccsssessesssensessensccescersssseneaeeeeeses
5
MIC
AMP
:
Z7
(X59-3210-10)
....scccssececesnsereseeen
-
65
CONVERSION
.........-cccsssesceeeetsessccevensssseceusvsseneesssssees
9
IF
:
ZB
(X59-3220-1O)
...
ee
eesecesssnssteteeeeseensneesneneetan
-
66
DISASSEMBLY
FOR
REPAIR
.............::sccsseessereees
11
BPF
/
VCA
:
Z9
(X59-3230-10)
...sccsesessrsrsesssereenn
-
67
BLOCK
DIAGRAM
............--:::scssccrsercessersetseeneecsenens
17
AVR
UNIT
(X43-3040-10)
oo...
ccseeesseseesssteesseeeeeene
-
68
CIRCUIT
DESCRIPTION
.............ceccssssesssersseeessereees
19
FINAL
UNIT
(X45-3250-XX)
...cssseccceeeeessecenstseeene
-
70
SEMICONDUCTOR
DATA
..........::cecccssscssesenteseseees
26
SIGNALING
UNIT
(X52-3140-10)
.....eceesstceesseren
-72
DESCRIPTION
OF
COMPONENTS
............scsceeees
31
DISPLAY
UNIT
(X54-3070-11)
.eecscccccccssreeneessenn
~
74
PARTS
LIST
........::cccescseeceescenseeresnnseneneceesscersscasenenses
33
TX-RX
UNIT
(X57-3270-XX)
oo
ecessessssseessceesesseneenn
-
78
DISASSEMBLY
.........ccscsssscccresenensessonnseusessconeresenses
53
SIGNALING
CIRCUIT
DIAGRAM
.................00008
-
83
PACKING
..........ccssssscssesseneescsesseccceeesssseosenancansrsseneses
55
SCHEMATIC
DIAGRAM
............ccssseesececssessenernennn
-
87
ADJUSTMENT
........:ccccccscsccorccessesusenscnscunsnrsesenezetsss
56
TERMINAL
FUNCTIONG.
.............:ccceeeeecesersencoeeens
~
95
PC
BOARD
VIEWS
/
CIRCUIT
DIAGRAMS
KMC-9
(BASE
MICROPHONE)
...........--cccsecsoeeetene
-
97
RX PLL: Z1, TX PLL : Z4 (X58-3120-10) ....sececees 62 SPECIFICATIONS. ...........csssscsseresessees BACK COVER

TKR-820
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
information for the equipment and is current as of the pub-
licatton date. Changes which may occur after publication
are covered by either Service Bulletins or Manual Revi-
sions. These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment infor-
mation, 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 chas-
sis or kit number of which it is a part, and a sufficient de-
scription of the required component for proper identifica-
tion.
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 ter-
minated.
@ 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 tech-
nician only.
® Be careful against electric hazard, for the commercial
power supply is being applied to the internal circuitry of
the radio even when the Power switch is OFF.
FCC COMPLIANCE AND TYPE NUMBERS
Type acceptance number |-Frequency range
Compliance
ALHSTKTKR-820-1
450 to 470MHz
Part 22, 74, 90 and 95A
ALHTKR-820-2
470 to 490MHz
Part 22, 74 and 90
ALHTKR-820-3
490 to 512MHz
Part 22, 74 and 90
ALHTKR-820-4
406 to 430MHz
Part 90
1. POWER-UP
To push on the radio. The POWER indicator will
illuminate to indicate power is ON.
2. TO RECEIVE
Operation Procedure
1. Disable OT Push on MONITOR switch.
If so programmed.
Turn SQUELCH control counter-
clockwise until noise is heard.
2. Unsquelch radio
3. Set VOLUME control Adjust VOLUME control for a
normal listening level.
4. Set SQUELCH control Advance SQUELCH control clock-
wise until noise just stops.
The radio will now receive all traffic on the selected channel.
5. Enable OT Press the MONITOR switch to OFF.
1f so programmed.
You will now hear messages for your system only.
3. TO TRANSMIT (in case a microphone is connectect}
Operation Procedure
1. Disable QT Depress MONITOR switchon front
panel or Microphone.
2. LISTEN DO NOT TRANSMIT if channel is
in use,
Press and hold the microphome PTT
switch. The Red LED on the front
panel will glow indicating he trans-
mitter is ON.
3. Key transmitter
Hold microphone at about2 inches
distance and speak at a nom al voice
level. Keep transmissions bief. -
4. Transmit message
5. Receive reply Release the microphone PTT switch.
6. Enable OT at end of
the conversation
Hf so programmed.
Depress MONITOR to theoust
position.

TKR-820
GENERAL
4. DURING OPERATION OF REPEATER
Operation Procedure
1. Enable repeat Press the REPEAT switch to ON.
When a signal including the abject
tone signal (provided that it has been
programmed) is input and if its level
is higher than the preset squelch level,
a signal modulated by the set tone
signal (provided that it has been pro-
grammed) and received audio signal
is transmitted.
2. Start of repeat
When the received signal disappears,
the transmission is stopped after the
set period of time. There indicator
lights while the signal is transmitted.
3. End of repeat
Press the REPEAT switch again to
OFF.
4. Disable repeat
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. LICENSING 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 installa-
tion.
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. QT equipment opera-
tion 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
crushing wiring, and radio installation to prevent overheat-
ing.
4-2. Antenna
When an outdoor antenna is to be installed, select an
unobstructed position with good visibility.
The VSWR of the antenna should be no more than 2.
Select a coaxial cable with as small Joss as possible, and
its length should be as short as possible.
4-3. Radio
Install the radio on a rack using rack-mount brackets,
or on a flat surface that can withstand its weight. Do not
install the radio in a place subject to direct sunlight or near
heating equipment. Avoid wet place, and install it ina well-
ventilated place.
4-4. AC power supply
This unit has been designed for use exclusively with
commercial AC power supply. As the rated current for
transmission output attains about 2A, connect the unit to
a wall outlet that can handle this current with margin.
SERVICE
This radio is designed for easy servicing. Referto the
schematic diagrams, printed circuit board views, and
alignment procedures contained in this manual.

TKR-820
Merchandise
received
h
SYSTEM SET-UP
Preparation : Prepare an EEPROM writer, KPT-20.
License and frequency
allocated by FCC
Frequency range | RF Power Type
450 ~ 470MHz 25W TKR-820 K,M
Choose the type of _ 470 ~ 490MHz 25W TKR-820 K2,M2
transceiver 490 ~ 512MHz 25wW | TKR-820 K3
490 ~ 520MHz 25W TKR-820 M3
406 ~ 430MHz 25W TKR-820 K4
See KPT-20 400 ~ 430MHz 25W TKR-820 M4
Frequency, Instruction
EEPROM writer manual.
q
See KPT-20
Instruction
Signaling DATA manuat.
EEPROM writer
{for Signaling unit)
See page 5.
EEPROM
installation
Duplexer
used?
See page 6.
Duplexer *
installation
“Option
__|
DC Back up
modification
Parts used?
See page 9,
OC Back up
modification
J
Mounting
Bracket
used?
NO
See page 8.
Mounting Bracket
installation
|
Delivery

TKR-820
INSTALLATION
Installing the EEPROM of Signaling Unit
Note :EEPROM is inserted into the Signaling unit of the
TKR-820. Install it after writing the data using the
ROM writer (KPT-20).
1. Remove the 10 screws (‘®@) holding the upper case to
remove the upper case.
2. Remove the 11 screws ( @) retaining the shield cover to
remove the shield cover. 2)
3. Insert the EEPROM (®) on which the data has been Shield cover g
written into the IC socket (IC10)} on the Signaling unit.
iC(EEPROM)
93C46?1

TKR-820
INSTALLATION
Installing the Duplexer
Note :When installing the duplexer in the TKR-820, use
the either of the following products ;
1. CELWAVE (USA), 435 to 470MHz (PD633-6A)
2. ANTEN CORPORATION (JAPAN),
450 to 470MHz (L79-0691-05)
400 to 430MHz (L79-0896-05)
1. Remove the 10 screws (‘@) holding the upper case to
remove the upper case.
2. Remove the 4 screws (‘@) holding the lower case to
remove the lower case.
3. After removing the upper and lower cases, turn the set
upside down, as shown in the figure 3) ).
4. Remove the coaxial cables (@). @) connected to the
TX and RX antenna connectors.
TX Antenna connector
RX Antenna connector
a =

TKR-820
INSTALLATION
(‘@) and the 8 screws C7) ) provided with the set.
6, Connect the one end of the connector cabel (@) pro-
vided with the set to the duplexer antenna connector o
and the other end to the ANT (center) of the duplexer. { TF =)
7. Connect the connector cable (®) wired from the TX é lh i |
section and the connector cable (®) wired fram the O--~@ [> C]
|
5. Mount the duplexer ‘@) using the mounting hardware y—— Duplexer Antenna connector
u
RX section to the duplexer.
[o]
00%
ex.
©)
a
CELWAVE'S Duplexer °
_ eO@ 9
tre vo todh
*
=
|
on
a
=
Note :The input/output connectors of the duplexer manu-
facture by CELWAVE or ANTEN are located as REC. ANT TRANS. LOW ANT HIGH
shown in the figure. Pay attention when connecting eth it __.2, afk, Te
the connectors (as input/output location is reversed). ° o ° oO ° rs) ° °
ie) ie} ie) o
CELWAVE’S Duplexer ANTEN’S Duplexer
Note :When making adjustments after installing the
duplexer, remove the front panel and hold down the
sub-pane! (®), then perform adjustments from
the adjusting holes ().

KR-820
INSTALLATION
Attaching the Rack-mount Brackets (for EIA racks)
The brackets and screws are optional.
Brackets : J21-4250-04 (Common for left and right)
Screws : NO9-0704-05 (Use 2 screws per bracket)
1. Attach the 2 brackets (@) using 4 screws (‘®).
2. When the TKR-820 is to be mounted vertically :
Attach 4 brackets (@), using 8 screws (@}), to the
sides of the bottom panel.
7
SS SN
© 4
ia
6

TKR-820
CONVERSION
Modification of the DC Switching Circuit
(For
Backup
during
a
Power
Failure)
TKR820
A
L
The
following
parts
(optional)
are
required
for
the
Fe
circuit
modification.
WUT
[|
|]
_O©_
|
pine
|
Diode
($25VB10)
..........
000000.
1
pe.
Cit)
DC
cable
(E30-2076-10)
.............
1
pe.
Connector
with
lead
wires
(E31-3389-05)
..
1
pc.
COMO!
Connector
with
lead
wires
(E31-3455-05)
..
1
pe.
oS
Screw
(N87-4014-46)
.........00
0084
1
pe.
1. From
the
cover
(‘®)
attached
to
the
rear
panel,
remove
the
2
screws
‘@)
and
take
off
the
cover.
®
I
ia
:
a
_)
Jt
L}—}-—L_}
©
9K;
©
°
|
©
[le
2.
Insert
the
connector
with
lead
wires
(
@)
into
the
hole
m
on
the
rear
panel
‘@)
(so
that
the
red
lead
is
on
the
right).
3.
Place
the
diode
(
@)
so
that
its
notch
faces
the
direc-
a)
|
tion
shown
in
the
illustration,
and
attach
it
using
a
|
screw
(@).
C2
|
|
|
4, Disconnect the connector (@) from the QUT terminal
of
the
AVR
unit,
and
connect
its
lead
wire
to
pin
1
of
a
5
i
0
ou
the
diode
(
).
B
8B
°
our)
4
SS
ae
Red
lead
@|
i
=
iC

TKR-820
CONVERSION
5. Connect the optional connector with lead wires ( ©) to f
the OUT terminal of the AVR unit and to pin 3 of the
diode.
a)
6. Connect the red lead (©) of the optional connector
with lead wires to pin 2 of the diode, and its black lead
(®) to the negative (—} terminal of chemical capacitor
C101. Do not disconnect the lead wire which has been \
connected to the C101 negative terminal, but connect
the black lead to it.
7. Connect the optional DC cable to the connector on the
rear panel (®).
TKR-820
10