Kenwood TK-P721 User manual

SERVICE MANUAL
This product complies with the RoHS directive for the European market. This product uses Lead Free solder.
© 2012-3 PRINTED IN JAPAN
B53-7011-10 (Y)PDF
VHF FM TRANSCEIVER
TK-P721
CONTENTS
GENERAL....................................................2
SYSTEM SET-UP.........................................3
REALIGNMENT...........................................3
DISASSEMBLY FOR REPAIR.....................9
CIRCUIT DESCRIPTION ...........................12
SEMICONDUCTOR DATA .........................17
COMPONENTS DESCRIPTION................18
PARTS LIST...............................................19
EXPLODEDVIEW......................................27
PACKING ...................................................28
ADJUSTMENT...........................................29
PC BOARD
TX-RX UNIT (X57-7880-22)....................34
SCHEMATIC DIAGRAM ............................38
BLOCK DIAGRAM.....................................44
LEVEL DIAGRAM......................................46
SPECIFICATIONS......................................47
Button knob
(SIDE1/SIDE2)
(K29-9426-03)
Knob (Selector)
(K29-9427-03)
Knob (Volume)
(K29-9309-13)
Plastic cabinet assy
(A02-4166-03)
Button knob (PTT)
(K29-9425-03)
Key top (16key)
(K29-9492-12)
Helical antenna
(KRA-26:Option)

TK-P721
2
GENERAL
INTRODUCTION
SCOPE OFTHIS 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-
lication date. Changes which may occur after publication
are covered by either Service Bulletins or Manual Revisions.
These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment informa-
tion, the full part identifi cation 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 suffi cient description of the re-
quired component for proper identifi cation.
PERSONAL SAFETY
The following precautions are recommended for personal
safety:
• DO NOT transmit until all RF connectors are verifi ed se-
cure and any open connectors are properly terminated.
• SHUT OFF and DO NOT operate this equipment near
electrical blasting caps or in an explosive atmosphere.
• This equipment should be serviced by a qualifi ed tech ni-
cian only.
SERVICE
This transceiver is designed for easy servicing. Refer
to the schematic diagrams, printed circuit board views, and
alignment procedures contained within.
Model TX-RX unit Frequency
range Remarks
TK-
P721 X57-7880-22 136~174MHz IF1: 49.95MHz LOC: 50.4MHz
Document Copyrights
Copyright 2012 by JVC KENWOOD Corporation. All
rights reserved.
No part of this manual may be reproduced, translated,
distributed, or transmitted in any form or by any means,
electronic, mechanical, photocopying, recording, or other-
wise, for any purpose without the prior written permission of
JVC KENWOOD Corporation.
Disclaimer
While every precaution has been taken in the preparation
of this manual, JVC KENWOOD Corporation assumes no
responsibility for errors or omissions. Neither is any liability
assumed for damages resulting from the use of the informa-
tion contained herein. JVC KENWOOD Corporation reserves
the right to make changes to any products herein at any time
for improvement purposes.

TK-P721
3
SYSTEM SET-UP
REALIGNMENT
Choose the type of transceiver
Transceiver programming
Delivery
Merchandise received
Are you using the speaker microphone?
A personal computer, programming interface (KPG-22A/22U),
and FPU (programming software) are required for programming.
(The frequency, TX power HI/LOW, and signaling data are
programmed for the transceiver.)
YES
NO
KMC-21, KMC-45 or KMC-48GPS
Speaker microphone
(Option)
Are you using the optional antenna? YES
NO
KRA-22 or KRA-26
Optional antenna
TX/RX 136~174 5.0W TK-P721
Frequency range (MHz) RF power Type
1. Modes
User mode
Data programming mode
PC test mode PC tuning mode
PC mode
Wireless clone mode
Firmware version information mode
Self-programming mode
Mode Function
User mode For normal use.
PC mode Used for communication between the trans-
ceiver and PC.
Mode Function
Data programming
mode Used to read and write frequency data and other features to and from the transceiver.
PC test mode Used to check the transceiver using the PC.
This feature is included in the FPU.
Wireless clone
mode Used to transfer programming data from one transceiver to another.
Firmware version
information mode Used to confi rm the internal firmware version.
Self-programming
mode You can program the frequency signaling and other function using only the transceiver.
2. How to Enter Each Mode
Mode Operation
User mode Power ON
PC mode Received commands from PC
Wireless clone mode [<B] + Power ON (Two seconds)
Firmware version
information mode [Side1] + [Side2] + Power ON (Two seconds)
Self-programming mode [S] + Power ON (Two seconds)

TK-P721
4
3. PC Mode
3-1. Preface
The transceiver is programmed by using a personal com-
puter, a programming interface (KPG-22A/22U) and pro-
gramming software (KPG-153D).
The programming software can be used with a PC. Fig-
ure 1 shows the setup of a PC for programming.
3-2. Connection Procedure
1. Connect the transceiver to the personal computer with
the interface cable.
Note:
• You must install the KPG-22U driver in the computer to
use the USB programming interface cable (KPG-22U).
2. When the POWER is switched on, user mode can be en-
tered immediately. When the PC sends a command, the
transceiver enters PC mode.
When data is read from the transceiver, the red LED
lights.
When data is written to by the transceiver, the green LED
lights.
Note:
• The data stored in the personal computer must match
Model Name and Model Type when it is written into EE-
PROM.
• Do not press the [PTT] key during data transmission or
reception.
3-3. KPG-22A Description
(PC programming interface cable: Option)
The KPG-22A is required to interface the transceiver with
the computer.It has a circuit in its D-sub connector (KPG-22A:
9-pin) case that converts the RS-232C logic level to the TTL
level.
The KPG-22A connects the SP/MIC connector of the
transceiver to the RS-232C serial port of the computer.
3-4. KPG-22U Description
(USB programming interface cable: Option)
The KPG-22U is a cable which connects to a USB port
on a computer.
When using the KPG-22U, install the supplied CD-ROM
(with driver software) in the computer. The KPG-22U driver
runs under Windows XP, Vista or 7.
3-5. Programming Software KPG-153D Description
The KPG-153D is the programming software for the
transceiver supplied on a CD-ROM. This software runs un-
der windows XP, Vista or 7 on a PC. The software on this
disk allows a user to program the transceiver via Program-
ming interface cable (KPG-22A/22U).
3-6. Programming with PC
If data is transferred to the transceiver from a PC with the
FPU, the data for each set can be modified.
Data can be programmed into the EEPROM in RS-232C
format via the SP/MIC jack.
In this mode the PTT line operate as TXD and RXD data
lines respectively.
Fig. 1
REALIGNMENT
PC KPG-22A or KPG-22U
Illustration is KPG-22A.
FPU
Tuning cable
(E30-3216-05)
Transceiver Transceiver
Gray
Gray/Black
1.5D-XV Lead wire
1.5D-XV Shield wire
+
–
+
–
SP
MIC
D-SUB
(9-pin)
KPG-22A
PC
USB
KPG-22U
PC

TK-P721
5
REALIGNMENT
4.Wireless Clone Mode
4-1. Outline
“Wireless Clone Mode” copies the transceiver data to an-
other transceiver.
The dealer can copy the transceiver data to another
transceiver even without the use of a personal computer.
4-2. Example
The transceiver can copy the programming data to one or
more transceivers via RF communication.
The clone source and clone target/s must be in wireless
clone mode.
4-3. Operation
1. To switch the clone target/s to Wireless Clone mode,
press and hold the [<B] key while turning the transceiver
power ON.
2. Wait for 2 seconds. “CLONE” appears on the LCD, fol-
lowed by “FRQTBL 1”.
3. Select a channel table number using the [Selector] knob.
4. To switch the clone source to Wireless Clone mode,
press and hold the [<B] key while turning the transceiver
power ON.
5. Wait for 2 seconds. “CLONE” appears on the LCD, fol-
lowed by “FRQTBL 1”.
6. Select the same channel table number as the clone tar-
get/s.
7. Press the [S] key on the clone source to begin data trans-
mission.When the clone target starts to receive data, the
green LED will light and “CLONING” will appear on the
LCD.The source unit will display “MASTER”.
8. When the clone source fi nishes sending data, a “confi r-
mation” tone will sound and “COMPLETE” will appear on
the LCD. If data transmission failed while cloning, the tar-
get unit will produced an error tone and “CLONE NG” will
appear on the LCD.
9. If the cloning fails, no data will be available in the target
unit when it is returned to User mode.
10.When the cloning is successful, the target unit's “Scan”
and “Key lock” functions will return to their default values
(Scan = OFF, Key lock = OFF).
11.The source will remain in clone mode after cloning. The
target unit will return to user mode after a successful
cloning.
Note:
• The dealer can clone data to two or more transceivers by
repeating the above procedures.
• If the transceivers wireless clone Mode is confi gured as
“Disabled”, the transceiver cannot enter Clone mode.
• The table shown below will cover the frequency tables
used for wireless cloning.
• Wireless clone mode cannot be entered in battery low
state.
• A unit cannot be a “Source Unit” if it is unprogrammed. If
the [S] key is pressed, an “error” tone will sound.
• Once a unit is set to be the source, it cannot be a target
after the data has been transmitted. This protects the
data in the source unit.
• MSK signaling is used in cloning.
• Electronic interface may cause a failure in data transfer
during Wireless Clone, such as when waveforms or elec-
tromagnetics are being performed at the workbench.
• Wireless clone mode can be used ONLY by the autho-
rized service personnel.
• The wireless clone mode setting must be confi gured as
“Disable” before being delivered to the end-user.
• To wireless clone, replace the antenna from both the
source transceiver and the target transceiver with a dum-
my load.
• The transmit output power is automatically set to Low in
Clone mode.
4-4. Adding the Data Password
If the Data password is set to the transceiver, you must
enter the password to activate a clone mode.The maximum
length of the password is 6 digits.
The following describes how to enter the password.
1. Press and hold the [<B] key for 2 seconds while turning
the transceiver power on.
2. “CLN.LOCK.R”(When the Read authorization password
is set to the transceiver.) / “CLN.LOCK.W” (When the
Overwrite password is set to the transceiver.) is displayed
on the LCD.
3. If the [selector] knob is rotated while “CLN.LOCK.R”/
“CLN.LOCK.W” is displayed, the number (0 to 9) fl ashes
on the LCD.
When you press the [C>] key, the currently selected num-
ber is determined.
If you press the [A] key, the least digit of the password is
deleted.
If you press the [S] key after entering the password in this
procedure, “FRQTBL 1” is displayed if the entered pass-
word is correct.
If the password is incorrect, “CLN.LOCK.R”/ “CLN.LOCK.
W” is redisplayed. (with error tone)
• Clone frequency table
No. Operating frequency 136~174 (MHz)
1 136.000
2 138.000
3 140.000
4 142.000
5 144.000
6 146.000
7 148.000
8 150.000
9152.000
10 154.000
11 156.000
12 158.000
13 160.000
14 162.000
15 164.000
16 166.000
17 168.000
18 170.000
19172.000
20 174.000

TK-P721
6
REALIGNMENT
5. Self Programming Mode
Write mode for frequency data and signaling, etc. To be
used ONLY by the authorized service person maintaining the
user's equipment. After programming, reset the FPU to the
“Self- Programming” disabled mode. Transceivers CANNOT
be delivered to the end-user in the self-programming mode.
5-1. Enter to the Self Programming Mode
Press and hold the [S] key for 2 seconds while turning
the transceiver power on.
When the transceiver enters in the self programming
mode, “1- 1” is displayed 2 seconds after “SELF” is dis-
played.
Note:
This mode (self programming mode) cannot be set when
it has been disabled with the FPU.
5-2. Adding the Data Password
If the Data password is set to the transceiver, you must
enter the password to activate a self programming mode.
The maximum length of the password is 6 digits.
The following describes how to enter the password.
1. Press and hold the [S] key for 2 seconds while turning
the transceiver power on.
2. “SLF.LOCK.R” (When the Read authorization password is
set to the transceiver.) / “SLF.LOCK.W” (When the Over-
write password is set to the transceiver.) is displayed on
the LCD.
3. If the [selector] knob is rotated while “SLF.LOCK.R”/ “SLF.
LOCK.W” is displayed, the number (0 to 9) fl ashes on the
LCD.
When you press the [C>] key, the currently selected num-
ber is determined.
If you press the [A] key, the least digit of the password is
deleted.
If you press the [S] key after entering the password in this
procedure, “SELF” is displayed if the entered password is
correct.
If the password is incorrect, “SLF.LOCK.R”/ “SLF.LOCK.W”
is redisplayed.
5-3. Channel Selection Mode
In this mode, the Zone or Channel can be selected.
Press and hold the [S] key for 2 seconds while turning
the transceiver power on to enter self programming mode.
When the transceiver enters in the self programming mode,
the transceiver automatically enters the Channel Selection
mode.
2 seconds after displaying “SELF", “1- 1” appears on the
LCD.
The setup item for channel selection mode is as follows.
Setup item Display Remarks
Select
Zone/Channel *** - ***
*** - *** Zone: 1~128
Channel: 1~128
Key operation
Key Key Function
[Selector] Toggle between Zone selection and Channel selec-
tion
[Side1] No action
[Side2] No action
[S] Enter the Item Setting mode
[A] Return to the Channel Selection mode
[<B] Decrement the blinking Zone/Channel number by 1.
Press and hold to decrement in steps of 10.
[C>] Increment the blinking Zone/Channel number by 1.
Press and hold to decrement in steps of 10.
Note:
If a non-existing Zone-Channel is selected and the mem-
ory for all 128 channels is already fi lled, an error tone will
sound and “MEM.FULL” will appear on the LCD for 2 sec-
onds.
5-4. Item Selection Mode
In this mode, the following items can be selected.
• RX frequency
• RX signaling
• TX frequency
• TX signaling
• RF power Hi/Low
• Scan Del/Add
• Beat shift on/off
• Compander on/off
When the [S] key is pressed in the Channel Selection
mode, the transceiver enters the Item Selection mode.
Key operation
Key Key Function
[Selector] The selected item changes
[Side1] No action
[Side2] No action
[S] Enter the Item Setting mode
[A] Return to the Channel Selection mode
[<B] Error tone sounds
[C>] Error tone sounds

TK-P721
7
REALIGNMENT
5-5. Item Setting Mode
In this mode, the selected item in the Item Selection
mode can be programmed.
When the [S] key is pressed in the Item Selection mode,
the transceiver enters the Item Setting mode.
The setup items for item setting mode are as follows
Setup item Display Remarks
1. RX frequency 1. RX FREQ

***.*****
Receive frequency
136.00000~174.00000MHz
2. RX signaling
2. RX SIG
TONE OFF/
QT ***.*/
DQT ***N/
DQT ***I
Receive QT/DQT
3.TX frequency 3.TX FREQ 
***.***** Transmit frequency
136.00000~174.00000MHz
4.TX signaling
4.TX SIG 
TONE OFF/
QT ***.*/
DQT***N/
DQT***I
Transmit QT/DQT
5. RF power Hi/Low 5. PWR *** HI/LOW
6. Scan Del/Add 6. SCN *** DEL/ADD
7. Beat shift on/off 7. SFT *** ON/OFF
8. Compander on/off 8. CMP *** ON/OFF
Key operation
Key Key Function
[Selector] Changing the selection item (RX/TX frequency and
RX/TX signaling only)
[Side1] No action
[Side2] No action
[S]
• Store the current settings and return to the Item
Selection mode without backup.
• A MHz digit of the frequency blinks. (RX/TX fre-
quency only)
• The icon of the current signaling confi guration
blinks. (RX/TX signaling only)
[A] Abort the current settings and return to the Item
Selection mode without backup.
[<B] Toggle/Decrease the blinking value.
[C>] Toggle/Increase the blinking value.
5-6. Self Programming Mode flow chart
■ Channel selection mode flow chart
Data password
[S]+Power ON
SLF.LOCK.R
or
Display
SLF.LOCK.W
SELF I - I
Zone Channel
Self programming mode
[S]
[S][A]
Channel selection mode
[S][A]
Zone selection Channel selection
Item setting mode
[S]
Read authorization password /
Overwrite password entry (6 digits)
When the Read
authorization password is
set to the transceiver.
When the Overwrite
authorization password is
set to the transceiver.
[Selector]
[<B] : Zone/Channel number decrement
[C>] : Zone/Channel number increment
■ Item selection mode flow chart
Channel selection mode
[S]
[S][A] 1. RX frequency
[Selector]
[S][A] 2. RX signaling
[Selector]
[S][A] 3.TX frequency
[Selector]
[S][A] 4.TX signaling
[Selector]
[S][A] 5. RF power Hi / Low
[Selector]
[S][A] 6. Scan Del / Add
[Selector]
[S][A] 7. Beat shift on / off
[Selector]
[S][A] 8. Compander on / off
Item setting mode
[Selector]

TK-P721
8
■ Item setting mode flow chart
[Selector]
[1. RX frequency] or
[3.TX frequency]
[S]
[A] MHz setting
Current
setting value
Value is not set
136. 00000
Display
136. 00000
136. 00000
STP 5.00K
--------
--------
[Selector]
[A] kHz setting
[Selector]
[A] Channel step
[Selector]
[<B] / [C>]
[<B] / [C>]
[<B] / [C>]
[S]
[S]
[S]
[S] : Cleared
[A] Frequency clear
[Selector]
[2. RX signaling] or
[4.TX signaling]
[S]
[A] OFF
[2. RX signaling] or
[4.TX signaling]
OFF
DQT I
Display
TONE OFF
QT 67.0
DQT 023N
DQT 023 I
[Selector]
[A] QT
[Selector]
[A] DQT N
[Selector]
[S] :Tone off
[<B] / [C>]
[<B] / [C>]
[S]
[S]
[S][<B] / [C>]
[A] DQT I
5. RF power Hi / Low
[S]
Hi / Low selection Hi Low
[S] : Stored
[A]:
Not
stored
Display
5.PWR HI
[<B] / [C>]
6. Scan Del / Add
[S]
Del / Add selection Del Add
[S] : Stored
[A]:
Not
stored
Display
6.SCN ADD
[<B] / [C>]
[7. Beat shift on/off] or
[8. Compander on/off]
[S]
on / off selection on off
[S] : Stored
[A]:
Not
stored
Display
7.SFT ON or
8.CMP ON
[<B] / [C>]
6. FirmwareVersion Information Mode
Turn the transceiver ON with the [Side1] and [Side2] keys
held down.Then, the version is displayed during holding the
[Side1] and [Side2] keys.
REALIGNMENT

TK-P721
9
DISASSEMBLY FOR REPAIR
1. Removing the Case Assembly from the
Chassis
1. Remove the selector knob aand volume knob b.
2. Remove the two screws c.
3. Lift and remove the chassis from the case assembly d.
(Use a fl at-blade screwdriver to easily lift the chassis.)
a
b
c
c
d
2. Removing the Holder Assembly from
the Chassis
1. Remove the holder from the chassis.
Note: Taking care not to cut the speaker and microphone
lead.
2. Detach the solder of speaker and microphone lead from
the PCB beforehand.
3. Remove the packing efrom the SP/MIC jack of the TX-
RX unit.
BLU
YEL
RED
BLK
S+
S-
M+
M-
Note: To remove the Holder Assy from
the Chassis,useaflat-head screwdriver
and insert to this hole.
e
3. Removing theTX-RX unit from the
Chassis
1. Remove the eleven screws f fi xing the TX-RX unit.
2. Remove the solder of the antenna terminal with a solder-
ing iron g.
3. Remove the solder of the positive terminal with a solder-
ing iron h.
Note: You can remove the TX-RX unit from the chassis
without removing the solder at the positive terminal.
However, in this case, you can not attach the packing
(G53-1605-03) that is on the positive terminal to the
chassis in assembling. So, it is advisable to remove the
solder on the positive terminal first.
4. Remove the FPC from the fl at cable connector i.
5. Lift and remove the TX-RX unit from the chassis j.
fx2
fx2fx2
g
i
j
h
f
f
f
f
f
4. Removing the Battery Release Lever
from the Case Assembly
1. Press the upper part of the lever toward the inside of the
case assembly. One side of the shaft will be removed a.
2. Lift and remove the battery release lever from the case
assembly b.
Note: Scratch and widen the glue hole if there is diffi culty
in removing the other end of the shaft.
No glue is required when you reassemble the battery re-
lease lever.
b
a

TK-P721
10
DISASSEMBLY FOR REPAIR
5. Attaching the Battery Release Lever to
the Case Assembly
1. Insert one side of the shaft into the hole at the lever fitting
section on the case assembly a.
Caution: The thin spring (G01-4543-14) should be posi-
tioned above the two tabs of the lever.
2. Tilt the battery release lever slightly forward b, so that
the thick spring (G01-4542-04) is positioned below the
case surface.
3. With the thick spring positioned below the case surface,
attach the other side of the shaft to the case assembly
by pressing the battery release lever cuntil it snaps into
place d.
Caution: Be careful not to tilt the battery release lever
too forward.
If the battery release lever is pushed in this state where
the two tabs come below the case surface, there is a
possibility of damaging the two tabs.
A thin spring
Shaft
Tow tabs
A thick spring
ab
c
d
6. Assembling the Battery Release Lever
1. Place the lever bonto the stopper a.
2. Place the thick spring conto the lever.
3. Hook the right and left ends of the thin spring donto the
tabs of the stopper, then place the thin spring onto the
lever e.
4. Slide the shaft through the hole of the stopper and lever f.
a
b
c
d
e
f
7. Attaching the PositiveTerminal to the
Chassis
Always attach the positive terminal to the chassis, using
the following procedures, before mounting the TX-RX unit
onto the chassis.
1. Remove the holder assembly bfrom the packing aof
the positive terminal.
2. Mount the packing of the positive terminal into the chas-
sis hole c.
3. Mount the holder assembly into the packing of the posi-
tive terminal d.
a
c
b
d

TK-P721
11
DISASSEMBLY FOR REPAIR
8. Mounting the Chassis to the Case
Assembly
1. Confirm that the waterproof packing attached to the
circumference of the chassis is securely inserted in the
groove of the chassis a.
2. Insert the upper part of the chassis into the case assem-
bly b.
3. Press the chassis cand the case assembly together to
attach them.
Caution: If the packing of the SP/MIC does not come
to the correct position after attaching the chassis to the
case assembly, reposition the packing with your fi ngers.
a
b
c
c
9. Attaching the Antenna Receptacle to
the Chassis
Screw the antenna receptacle to the chassis in the or-
der shown in the drawing so that the antenna receptacle
comes to the center of the case hole.
Tighten this screw second.
Ti
g
hten this screw first.
10.The Nuts of the Volume Knob and
Channel Knob
Note that the shapes, colors and heights of nuts of the
volume knob and channel knob are different from one
another. (The nut of volume knob is silver, and the nut of
channel knob is gold.)
Use the following jig when removing the nuts of the vol-
ume knob and channel knob.
• Jig (Part No.: W05-1012-00)
for Volume knob
(Long) for Selector knob (Short)
11. Screw sequence for mounting theTX-
RX unit to the chassis
Attach the TX-RX unit to the chassis using the screws in
the order shown in the drawing below.
TX-RX UNIT
Component side view
gh
i
jk
d
eb
fc
a

TK-P721
12
1. Frequency Configuration
The receiver utilizes double conversion. The first IF is
49.95MHz and the second IF is 450kHz. The fi rst Local os-
cillator is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the neces-
sary frequencies.
CIRCUIT DESCRIPTION
2. Receiver System
The receiver system is shown in Figure 2.
Fig. 1 Frequency configuration
Fig. 2 Receiver system
TX/RX: 136~174MHz
185.95~
223.95MHz
136~174MHz
1st MIX MCF SP
MIC
CF
450kHz
ANT
ANT
SW RF AMP IF System
X3
multiply
PLL
VCO
49.95MHz 50.4MHz
TX
AMP RF AMP
AF
AMP
MIC
AMP
AF
baseband
TCXO 16.8MHz
SP
ANT
IC401
IF,MIX,DET
Q406
1st MIX
ANT
SW
Q403
X3 multiply
2nd Local
X1
TCXO
16.8MHz
AF
baseband
IC812
BPF1
BPF Q407 RF AMP XF401
MCF
Q405
IF AMP IC815 AF PA
BPF1 1st Local
BPF
CF402 CF401
2-1. Front End (RF Amplifier) Circuit
The signal coming from the antenna passes through the
transmit / receive switching diode circuit (D201, D202, D203
and D204) and a BPF (L418 and L419), and is then ampli-
fi ed by the RF amplifi er (Q407).
The resulting signal passes through a BPF (L419, L418,
L416 and L414) and goes to the mixer. These BPFs are ad-
justed by variable capacitance diodes (D408, D407, D405
and D404). The input voltage to the variable capacitance
diodes is a regulated voltage output from the DC amplifi er
(IC811).
2-2. First Mixer
The signal from the front end is mixed with the fi rst local
oscillator signal generated in the PLL circuit by Q406 to pro-
duce a fi rst IF frequency of 49.95MHz.
The resulting signal passes through the XF401 MCF to
cut the adjacent spurious and provide the optimum charac-
teristics, such as adjacent frequency selectivity.

TK-P721
13
2-3. IF Amplifier Circuit
The fi rst IF signal is passed through a four-pole mono-
lithic crystal fi lter (XF401) to remove the adjacent channel
signal. The fi ltered fi rst IF signal is amplifi ed by the fi rst IF
amplifier (Q405) and is then applied to the IF system IC
(IC401).
The IF system IC provides a second mixer, limiting
amplifier, quadrature detector and RSSI (Received Signal
Strength Indicator). The second mixer mixes the fi rst IF sig-
nal with the 50.4MHz signal of the second local oscillator
output (Q403) and produces the second IF signal of 450kHz.
The second IF signal is passed through the ceramic fi l-
ter (Wide: CF402, Narrow: CF401) to remove the adjacent
channel signal. The fi ltered second IF signal is amplifi ed by
the limiting amplifi er and demodulated by the quadrature de-
tector with the ceramic discriminator (CD401). The demodu-
lated signal is routed to the audio circuit.
2-4.Wide/Narrow Switching Circuit
Wide and narrow settings can be made for each channel
by switching the ceramic fi lters CF401 (narrow).
The second IF signal always passes the ceramic fi lters
CF402 (Wide).
The wide and narrow switching data is output from the
MCU (IC820).
D401 and D402 are switched to ceramic fi lters when a
narrow mode is selected.
Q404 turns on/off with the Narrow and the IC401 detector
output level is changed to maintain a constant output level
during wide or narrow signals.
IC401
WID/NAR
D401
IFOUT
MXO IFI QUAD
AFOUT
C404
R406
C402
C414
R408 R411
R415
D402
CF401
CF402
C424
R423 R424
Q401
R426 50C
AFOUT
CD401
Q404
R409
IC402
+-
R471
Fig. 3 Wide/Narrow switching circuit
2-5. Audio Amplifier Circuit
The demodulated signal from IC401 is sent to an AF am-
plifi er through baseband IC (IC812), and is routed to an au-
dio power amplifi er (IC815) where it is amplifi ed and output
to the speaker.
2-6. Squelch Circuit
Part of the AF signal from the IC401 enters the FM sys-
tem IC (IC401) again, and the noise component is amplifi ed
and rectified by a filter and an amplifier to produce a DC
voltage corresponding to the noise level.
The DC signal from the FM IC goes to the analog port of
the MCU (IC820). IC820 determines whether or not to output
sounds from the speaker by checking if the input voltage is
higher or lower than the preset value.
To output sounds from the speaker, IC820 sends a high
signal to the AF_CONT line and turns IC815 on through
Q813, Q814, Q818 and Q819.
3.Transmitter System
3-1. Microphone Amplifier Circuit
The signal from the microphone is limited by the AGC
circuit, which is composed of D807, D808, Q810, Q811 and
the mute switch (Q809). IC812 is composed of a high-pass
fi lter, low-pass fi lter and pre-emphasis/IDC circuit.
The signal from the microphone and the low speed data
from the MCU (IC820) enter the baseband IC (IC812) and
pass through each path and are mixed inside the IC.
The output signal from the baseband IC goes to the VCO
modulation input.The other output signal passes through the
amplifi er (IC3) and goes to the TCXO modulation input.
AMP
IC3
AGC
SW
D807,808
Q810,811
MIC_MT
X1
TCXO
VCO
LSD
OUT
IC812
Q809
MIC
Baseband
IC
Fig. 4 Microphone amplifier circuit
CIRCUIT DESCRIPTION

TK-P721
14
3-2. Drive and Final Amplifier Circuit
The signal from the T/R switch (D18 is on) is amplifi ed by
the RF AMP (Q201) and pre-drive amplifi er (Q203) to 50mW.
The output of the pre-drive amplifi er is amplifi ed by the
drive amplifi er (Q204) and the RF fi nal amplifi er (Q205) to
5.0W (1W when the power is low).
The drive amplifi er and the RF fi nal amplifi er consist of
two MOS FET stages.
The output of the RF final amplifier is then passed
through the harmonic fi lter (LPF) and antenna switch (D201
and D202) and is applied to the antenna terminal.
3-3. APC Circuit
The APC circuit always monitors the current flowing
through the drive amplifi er (Q204) and the RF power ampli-
fi er (Q205) and keeps a constant current. The voltage drop
at R307, R309 and R310 is caused by the current fl owing
through the RF fi nal amplifi er. This voltage is applied to the
differential amplifi er IC301 (1/2).
IC301 (2/2) compares the output voltage of IC301 (1/2)
with the reference voltage from IC811. The output of IC301
(2/2) controls the VG of the RF power amplifi er and the drive
amplifi er to make both voltages the same.
The change of power high/low is carried out by the
change of the reference voltage.
CIRCUIT DESCRIPTION
Fig. 5 Drive and fi nal amplifier and APC circuit
4. Frequency Synthesizer Unit
4-1. Frequency synthesizer
The frequency synthesizer consists of the TCXO (X1),
VCO, PLL-IC (IC1), and buffer amplifi ers.
The TCXO generates 16.8MHz.The frequency stability is
1.5ppm within the temperature range of –30°C to +60°C.The
frequency tuning and modulation of the TCXO are done to
apply voltage to pin 1 of the TCXO.The output of the TCXO
is applied to pin 10 of PLL-IC.
The VCO consists of 2 VCO and covers a dual range of
136.00~174.00MHz and 185.95~223.95MHz.The VCO gen-
erates 185.95~223.95MHz for providing the fi rst local signal
for reception. The operating frequency is generated by Q5 in
transmitting mode and Q4 in receiving mode.The oscillation
frequency is controlled by applying the VCO control voltage,
obtained from the phase comparator (IC1) to the variable ca-
pacitance diodes (D4, D6, D8 and D9in transmitting mode
and D10 and D12 in receiving mode)
The TX/RX pin of IC820 goes “high” in transmitting mode,
causing Q7 and Q4 to turn off, and Q5 turn on. The TX/RX
pin goes “low” in receiving mode.
The output from Q4 and Q5 are amplifi ed by a buffer am-
plifi er (Q8) and Q2, and then sent to the PLL-IC.
The PLL-IC consists of a prescaler, reference divider,
phase comparator, and charge pump. The input signal from
pin 10 and 17 of the PLL-IC is divided down and compared
at the phase comparator. The pulsed output signal of the
phase comparator is applied to the charge pump and trans-
formed into a DC signal in the loop fi lter (LPF). The DC sig-
nal is applied to the CV of the VCO and locked to keep the
VCO frequency constant.
PLL data is output from PL_STB (pin 20), PL_CLK (pin 8),
and PL_DAT (pin 21) of the MCU (IC820). The data is input
to the PLL-IC when the channel is changed or transmission
is changed to reception and vice versa.PLL lock condition is
always monitored by pin 18 (PL_UL) of the MCU. When the
PLL is unlocked, PL_UL goes low.
ANT
RF FINAL
AMP ANT SW
From
T/R SW
(D18)
D201,202
+B
PC/BPF2
(IC811)
RF
AMP
Q201 Q205
DRIVE
AMP
Q204
VDD VG
Pre-DRIVE
AMP
Q203
IC301
(1/2) IC301 (2/2)
R307
R309
R310

TK-P721
15
RF
AMP
Baseband
IC
VCO
PLL
MCU
IC820 PL_STB,PL_CLK,PL_DAT
IC1
PL_UL
17
10
21
7
BUFF
SWLPF
To mixer
VC
Q9
BUFF
Q8
TCXO
X1 IC812
SW To
RF AMP
TX/RX
(TX: High)
D18
D17Q2
CV
Fig. 6 PLL block diagram
5. Control Circuit
The control consists of the MCU (IC820) and its peripher-
al circuits. It controls the TX-RX unit. IC820 mainly performs
the following;
1) Switching between transmission and reception by PTT
signal input.
2) Reading channel information, frequency, and program
data from the memory circuit.
3) Sending frequency program data to the PLL.
4) Controlling squelch on/off via the DC voltage from the
squelch circuit.
5) Controlling the audio mute circuit via the decode data in-
put.
6) Transmitting tone and encode data.
5-1. Frequency Shift Circuit
The MCU (IC820) and baseband IC (IC812) operates at
a clock frequency of 19.2MHz. The oscillator circuit has the
baseband IC. This oscillator has a circuit that shifts the fre-
quency via Beat shift switch (Q806).
A beat sound may be able to be evaded if “Beat Shift“ is
set to ON when it is generated in the internal spurious trans-
mission modulated sound of the transceiver.
IC812
Baseband IC
H: OFF
L: ON
MCU
XIN
X802
39 40
XOUT XIN
Q806
C846 R857
MCU
BSHIFT
Fig. 7 Frequency shift circuit
5-2. Memory Circuit
The Memory circuit consists of the MCU (IC820) and
EEPROM (IC810).The EEPROM has a capacity of 512k bits
and stores the channel information, the last channel data,
the scan on status, and other parameters.
■EEPROM
Note:
The EEPROM stores tuning data (Deviation, Squelch,
etc.).
Realign the transceiver after replacing the EEPROM.
MCU EEPROM
IC820 IC810
Fig. 8 Memory circuit
5-3. Low BatteryWarning
The battery voltage is monitored by the MCU (IC820 pin
63: BATT). When the battery voltage falls below the voltage
set by the Low Battery Warning adjustment, the red LED
blinks, notifying the operator that it is time to replace the bat-
tery (when the always option (default setting) under the Bat-
tery Warning function in the FPU is selected). If the battery
voltage falls bellow 5.9V, the transceiver does not transmit
and the warning tone beeps while the PTT switch is pressed.
Low battery warning Battery status
The red LED blinks during
transmission. The battery voltage is low but the transceiver is still usable.
The red LED blinks and the
warning tone beeps while the
PTT switch is pressed.
The battery voltage is low and
the transceiver cannot be used
to make calls.
63
IC820
MCU
BATT
R824
SB
R829
Fig. 9 Low battery warning
CIRCUIT DESCRIPTION

TK-P721
16
5-4. Key Input
Keys and channel selector circuit.
The signal from the keys and channel selector are direct-
ly input to the MCU, as shown in Figure 10.
C
B
A
S
KEY1O KEY2O KEY3O KEY4O KEY1I KEY2I KEY3I KEY4I
EN2 EN1
Selector
IC820
MCU
PF2 PF1 PTT
Side1
Side2
PTT
456
789
0#
123
Fig. 10 Key input
6. Signaling Circuit
6-1. Encode
■Low-speed data (QT, DQT)
Low-speed data is output from pin 2 of the MCU.The sig-
nal passes through the low pass CR fi lter, and goes to the
baseband IC (IC812).The signal is mixed with the audio sig-
nal and goes to the VCO and TCXO (X1) modulation input
after passing through the D/A converter inside the baseband
IC (IC812) for BAL adjustment.
HSDENC
LSDO
IC820
MCU IC812 Baseband IC
TCXO
3
2
21
MIC
23
MOD1
VCO
24
MOD2
18
ALT
Fig. 11 Encode
■High-speed data (2-tone/5-tone)
High-speed data (HSD) is output from pin 3 of the MCU.
HSD deviation made by an adjustment in the MCU is passed
through the low pass CR fi lter and then applied to the base-
band (IC812).
The signal is mixed with the audio signal and goes to the
VCO and TCXO.
■MSK/DTMF
The MSK/DTMF signal is generated in the baseband IC
(IC812). The signal passes through the D/A converter (in-
side the baseband IC812) and is routed to the VCO. When
encoding the MSK/DTMF, the microphone input signal is
muted.
6-2. Decode
■QT/DQT
The output signal from the IF IC (IC401) enters the MCU
(IC820) through IC812. IC820 determines whether or not
the QT or DQT matches the preset value, and controls the
AFSW and speaker output sounds according to the squelch
results.
■2-tone/5-tone
Part of the received AF signal output from the IF IC (IC401)
passes through the baseband IC (IC812) goes to the other
AF amplifi er IC820 and 816, is compared, and then goes to
IC820. IC820 checks whether or not the 2-tone data is nec-
essary. If it matches, IC820 carries out a specifi ed operation,
such as turning the speaker on.
■MSK (Fleet Sync)
The MSK input signal from the IF IC (IC401) goes to
IC812. The decoded information is then processed by the
MCU.
■DTMF
The DTMF input signal from the IF IC (IC401) goes to
IC812. The decoded information is then processed by the
MCU.
7. Power Supply
There are fi ve 5V power supplies and three 3.3V power
supplies: 50M, 50V, 50C, 50R, 50T, 33M, 33MS and 33B.
50M and 33M are always output while the power is on.
33MS is always output, but turns off when the power is
turned off, to prevent malfunction of the MCU.
50C is a common 5V and is output when SAVE is not set
to ON.
50R is 5V for reception and output during reception.
50T is 5V for transmission and output during transmis-
sion.
50V is 5V for the SP/MIC connector.
33B is 3.3V for the baseband IC (IC812).
CIRCUIT DESCRIPTION

TK-P721
17
MCU: F363BEDFEKDLE (TX-RX unit IC820)
Pin No. Signal Name I/O Function
1 BSHIFT O CPU clock frequency shift
2 LSDO O QT/DQT output
3 HSDENC O 2-Tone/BEEP output
4 EN1 I Encoder detect for direction
5 EN2 I Pull up for P8_4 (EN2)
6 MODE I (Using E8a emulator)
7 NC - NC
8 PL_CLK O PLL IC clock output
9RESET - Hardware reset input
10 XOUT - NC
11 VSS - GND
12 XIN - Main clock input (19.2MHz)
13 VCC - 3.3V
14 EMPTT O Emergency PTT
15 EN2 I Encoder interrupt
16 CM_IRQ I Baseband IC IRQ
17 INT0 I Battery low interrupt (4.5V)
18 PL_UL I PLL IC unlock input
19PTT I PTT input
20 PL_STB O PLL IC STB output
21 PL_DAT O PLL IC data output
22 NC NC
23 33MSC O 33MS control for switched 33M
24 TXD O Serial data (FPU) to PC
25 RXD I Serial data (FPU) from PC
26 EM_CLK O For E8a emulator
27 APCSW O APC enable/disable
28 TX/RX O TX/RX switch H:TX, L: RX
2950VC O 5V AVR control for GPS MIC op-
tion/OPT DET
30 5TC O 5T control output
31 EP_DTO O EEPROM IC data output
32 EP_CLK O EEPROM IC clock output
33 CM_DTO O Baseband IC data output
34 EMP O For FDT tool
35 5RC O 5R control output
36 EP_WP O EEPROM IC write protect output
37 EP_DTI I EEPROM IC data input
38 EP_CS O EEPROM IC chip select output
39CE O For FDT tool
40 CM_CLK O Baseband IC clock output
SEMICONDUCTOR DATA
Pin No. Signal Name I/O Function
41 CM_DTI I Baseband IC data input
42 CM_CNS O Baseband IC chip select output
43 DC_SW O APC voltage discharge switch
44 KEY1O O Key matrix output 1
45 KEY2O O Key matrix output 2
46 KEY3O O Key matrix output 3
47 KEY4O O Key matrix output 4
48 KEY1I I Key matrix input 1
49KEY2I I Key matrix input 2
50 KEY3I I Key matrix input 3
51 KEY4I I Key matrix input 4
52 PF1 l Side key 1 input
53 PF2 l Side key 2 input
54 LCDBL O LCD backlight switch
L: ON, H: OFF
55 LC_INH O LCD diver IC INH output
56 LC_CLK O LCD diver IC clock output
57 LC_DAT O LCD diver IC date output
58 LC_CE O LCD diver IC chip enble output
59LC_MOD O LCD diver IC mode output
60 HSDDEC I 2-Tone/5-Tone decode input
61 QT/DQT I QT/DQT decode input
62 CVIN I VCO lock voltage reading for
auto alignment
63 BATT I Battery level input
64 VOX I VOX level input
65 BUSY I RX busy input
66 TH_DET I Temperature level input
67 RSSI I RSSI input
68 WID/NAR O Wide Narrow switch
H:WID, L: NAR
69ASSIST O Assist switch
70 AF_MUT O Speaker mute output
71 MIC_MT O Mic mute output
72 MAN_DN I MAN down
73 5CC O 5C control output
74 LEDBLU O Blue LED light control
75 AVSS - GND
76 LEDGRN O Green LED light control
77 VREF - 3.3V for A/D reference
78 AVCC - 3.3V
79LEDRED O Red LED light control
80 OPTDET I Option detection input

TK-P721
18
TX-RX unit (X57-7880-22)
Ref. No. Use / Function Operation / Condition
IC1 PLL IC TX/RX 1st local
IC2 OP amplifi er CVIN/CVADJ amplifi er
IC3 OP amplifi er APC control
IC301 OP amplifi er CVIN/CVADJ amplifi er
IC401 FM IC RX FM system
IC402 Comparator Narrow fi lter switching
IC801 5V AVR 50M
IC802 5V AVR 50C
IC803 5V AVR 50V
IC804 3.3V AVR 33M
IC805 Reset IC Low battery level detector
IC806 3.3V AVR 33B
IC807 Reset IC MCU reset signal
IC808 OP amplifi er HSD amplifier
IC810 EEPROM EEPROM
IC811 OP amplifi er RX BPF tuning
IC812 Baseband IC Audio processor
IC815 AF amplifi er Audio power amplifi er
IC817 OP amplifi er VOX signal amplifi er
IC820 MCU Microcontroller unit
IC821 LCD driver
Q2 RF buffer PLL-IC input
Q3 Ripple fi lter TX/RX VCO
Q4 Oscillator RX VCO
Q5 Oscillator TX VCO
Q6 DC switching TX VCO switching
Q7 DC switching RX VCO switching
Q8 RF buffer VCO output
Q9RF amplifi er VCO output
Q11,12 DC switching Assist switching
Q201 RF amplifi er TX amplifier
Q203 RF amplifi er Pri-drive amplifi er
Q204 FET amplifi er Drive amplifi er
Q205 FET amplifi er Final power amplifi er
Q301~306 DC switching TX FET bias
Q401 DC switching Q404 control
Q403 Tripler 2nd local (16.8MHz x 3)
Q404 DC switching FM-DET level switching
Q405 IF amplifi er 1st IF (49.95MHz)
Q406 Mixer 1st mixer
Q407 RF amplifi er RX (VHF)
Q801 DC switching Blue LED
Q802 DC switching 50T from 50M
Q803 DC switching 50R from 50M
COMPONENTS DESCRIPTION
Ref. No. Use / Function Operation / Condition
Q804 DC switching 33MS from 33M
Q805 DC switching Green/Red LED
Q806 DC switching MCU clock shift circuit
Q809DC switching MIC mute
Q810,811 Amplifier AGC control
Q813 DC switching Q814 control
Q814 DC switching AF power mute
Q815 Level converter EXT PTT/RXD
Q816 Level converter EXT TXD
Q817 DC switching Pop noise mute
Q818,819AF switching AF power mute
Q820 DC switching Q821 control
Q821 DC switching Backlight LED
Q822 DC switching EMG PTT
D4,6,8,9Varicap TX VCO tune
D10,12 Varicap RX VCO tune
D13 Speed up Ripple fi lter
D14 Varicap TX VCO assist tune
D15 Varicap RX VCO assist tune
D16 Varicap Modulation
D17,18 Switching TX-f/RX 1st local
D201~204 Switching TX/RX ANT switching
D301 5.1V zone Over voltage prevention
D401,402 Switching Narrow fi lter on/through
D404,405 Varicap RX RF BPT tune
D407,408 Varicap RX RF BPT tune
D801 LED (green) Busy
D803 Protection Power supply
D804 LED (blue) Signal
D805 LED (red) TX
D806 5.1V zener Over voltage prevention
D807,808 Detection MIC level
D809,810 Detection VOX level
D817 Speed up LCD back light
D818~821 LED (yellow) Backlight
D824 LED (yellow) Backlight
D829Key input detect Key1I input
D830 Key input detect Key2I input
D831 Key input detect Key3I input
D832 Key input detect Key4I input

TK-P721
19
Chip capacitor
Code L W T
Empty 5.6±0.5 5.0±0.5 Less than 2.0
A 4.5±0.5 3.2±0.4 Less than 2.0
B 4.5±0.5 2.0±0.3 Less than 2.0
C 4.5±0.5 1.25±0.2 Less than 1.25
D 3.2±0.4 2.5±0.3 Less than 1.5
E 3.2±0.2 1.6±0.2 Less than 1.25
F 2.0±0.3 1.25±0.2 Less than 1.25
G 1.6±0.2 0.8±0.2 Less than 1.0
H 1.0±0.05 0.5±0.05 0.5±0.05
Chip resistor
Code L W T
E 3.2±0.2 1.6±0.2 1.0
F 2.0±0.3 1.25±0.2 1.0
G 1.6±0.2 0.8±0.2 0.5±0.1
H 1.0±0.05 0.5±0.05 0.35±0.05
s2ATINGWATTAGE
Code Wattage Code Wattage Code Wattage
1J 1/16W 2C 1/6W 3A 1W
2A 1/10W 2E 1/4W 3D 2W
2B 1/8W 2H 1/2W
,ESSTHANP&
Code B C D F G
(pF) ±0.1 ±0.25 ±0.5 ±1 ±2
#!0!#)4/23
C C 4 5 T H 1 H 2 2 0 J
1 2 3 4 5 6
1 = Type ...ceramic, electrolytic, etc. 4 =Voltage rating
2 = Shape ... round, square, etc. 5 = Value
3 = Temp. coefficient 6 = Tolerance
s4EMPERATURECOEFFICIENT
1st Word C L P R S T U
Color* Black Red Orange Yellow Green Blue Violet
ppm/°C 0 –80 –150 –220 –330 –470 –750
s4OLERANCE-ORETHANP&
Code C D G J K M X Z P No code
(%) ±0.25 ±0.5 ±2 ±5 ±10 ±20 +40 +80 +100 More than 10µF :–10~+50
–20 –20 –0 Less than 4.7µF : –10~+75
s6OLTAGERATING
2nd word
A B C D E F G H J K V
1st word
0 1.0 1.25 1.6 2.0 2.5 3.15 4.0 5.0 6.3 8.0 –
1 10 12.5 16 20 25 31.5 40 50 63 80 35
2 100 125 160 200 250 315 400 500 630 800 –
3 1000 1250 1600 2000 2500 2150 4000 5000 6300 8000 –
s#HIPCAPACITORS
(EX) C C 7 3 F S L 1 H 0 0 0 J Refer to the table above.
1 2 3 4 5 6 7 1 = Type
(Chip) (CH, RH, UJ, SL) 2 = Shape
3 = Dimension
(EX) C K 7 3 F F 1 H 0 0 0 Z 4 = Temp. coefficient
1 2 3 4 5 6 7 5 = Voltage rating
(Chip) (B, F) 6 = Value
7 = Tolerance
2%3)34/23
s#HIPRESISTOR#ARBON
(EX) R D 7 3 E B 2 B 0 0 0 J
1 2 3 4 5 6 7
(Chip) (B, F)
s#ARBONRESISTOR.ORMALTYPE
(EX) R D 1 4 B B 2 C 0 0 0 J
1 2 3 4 5 6 7
1 = Type 5 = Rating wattage
2 = Shape 6 = Value
3 = Dimension 7 = Tolerance
4 = Temp. coefficient
CC45 Color*
2nd Word G H J K L
ppm/°C ±30 ±60 ±120 ±250 ±500
Example : CC45TH = –470±60ppm/°C
s#APACITORVALUE
010 = 1pF 2 2 0 = 22pF
100 = 10pF
101 = 100pF Multiplier
102 = 1000pF = 0.001µF 2nd number
103 = 0.01µF 1st number
L
W
T
s$IMENSION
PARTS LIST

TK-P721
20
✽New Parts. indicates safety critical components.
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
L : Scandinavia K : USA P : Canada
Y : PX (Far East, Hawaii) T : England E : Europe
C: China X : Australia M : Other Areas
Ref. No. Address Parts No. Description Desti-
nation
New
parts
TX-RX UNIT (X57-7880-22)
Ref. No. Address Parts No. Description Desti-
nation
New
parts
PARTS LIST
L: Scandinavia K: USA P: Canada
Y: PX (Far East, Hawaii) T: England E: Europe
C: China X: Australia M: Other Areas
TK-P721
TX-RX UNIT (X57-7880-22)
1 1A A02-4166-03 PLASTIC CABINET ASSY
3 2C B09-0725-03 CAP(SP/MIC) ACCESSORY
4 1B B43-1622-04 BADGE(FRONT)
5 1B B43-1623-04 BADGE(REAR)
6 1C
✽B62-2445-10
INSTRUCTION MANUAL ACCESSORY
92A D10-0649-03 LEVER
10 1A D21-0863-04 SHAFT(LEVER)
11 1A D32-0441-13 STOPPER(LEVER)
13 2A E04-0477-15 RF COAXIAL RECEPTACLE(SMA)
14 3A E23-1253-04 TERMINAL(GND)
15 2A E23-1254-04 TERMINAL(+VE)
16 1B E37-1165-15
PROCESSED LEAD WIRE(SP+/RED)
17 1B E37-1514-05
PROCESSED LEAD WIRE(SP-/BLK)
193A F20-3353-14 INSULATING SHEET(+VE)
21 2A G01-4542-04 COIL SPRING
22 2A G01-4543-14 COIL SPRING
23 2B G10-1330-04 FIBROUS SHEET
24 2A G11-4465-04 RUBBER SHEET
26 3A G13-2009-04 CUSHION(CHASSIS-)
27 3A G13-2033-04 CUSHION(-VE)
28 3A G13-2034-14 CUSHION(SMA)
31 3B G13-2340-14 CUSHION(CF401/CF402)
33 2B G13-2358-04 CUSHION(IC820)
35 3A G53-1604-03 PACKING(CHASSIS)
36 2A G53-1605-03 PACKING(+VE)
37 2B G53-1802-04 PACKING(SMA)
392B G53-1845-03 PACKING(VOL/SEL)
40 1B G53-1846-03 PACKING(SPK)
41 1B G53-1847-03 PACKING(SP/MIC)
46 2A J19-5463-03 HOLDER(+VE)
47 2A J19-5473-03 HOLDER ASSY(+VE)
491B J19-5545-14 HOLDER ASSY(SPK)
48 2C J19-5549-03 HOLDER(SP/MIC) ACCESSORY
50 1C J29-0734-05 BELT CLIP ACCESSORY
52 2A J82-0127-05 FPC
54 1B K29-9309-13 KNOB(VOL)
55 1A K29-9425-03 BUTTON KNOB(PTT)
56 1A K29-9426-03 BUTTON KNOB(SIDE1/2)
57 1B K29-9427-03 KNOB(SELECTOR)
58 1A K29-9492-12 KEY TOP(16 KEY)
A 2A N14-0848-05 CIRCULAR NUT(SELECTOR)
B 2B N14-0849-05 CIRCULAR NUT(VOL)
C 2B N30-2604-48 PAN HEAD MACHINE SCREW
D 3A N30-2606-48 PAN HEAD MACHINE SCREW
E 2B,3A N83-2005-48 PAN HEAD TAPTITE SCREW
60 2C N99-2046-05 SCREW SET ACCESSORY
VR1 2A R31-0676-05 VARIABLE RESISTOR
62 1B T07-0787-05 SPEAKER
64 1B T91-0672-05 MIC ELEMENT
W1 2A W02-3748-05 ENCODER
X60-4020-22 TX-RX UNIT(FOR SERVICE)
101 2B B11-1876-03 ILLUMINATION GUIDE(LCD)
102 2B B11-1877-14 FILTER(LCD)
103 2B B38-0935-05 LCD
D801 B30-1790-05 LED(BLUE)
D804 B30-2314-05 LED(GREEN)
D805 B30-2315-05 LED(RED)
D818-821 B30-2337-05 LED(YELLOW)
D824-828 B30-2337-05 LED(YELLOW)
C1 CC73HCH1H101J CHIP C 100PF J
C3 CC73HCH1H100B CHIP C 10PF B
C4 CK73HB1H102K CHIP C 1000PF K
C5 CC73HCH1H101J CHIP C 100PF J
C7 CC73HCH1H100B CHIP C 10PF B
C8 CC73HCH1H101J CHIP C 100PF J
C9CK73HB1E103K CHIP C 0.010UF K
C10 CC73HCH1H101J CHIP C 100PF J
C11 CK73HB1E103K CHIP C 0.010UF K
C12 CC73HCH1H101J CHIP C 100PF J
C14 CK73HB1A473K CHIP C 0.047UF K
C15 CK73HB1A224K CHIP C 0.22UF K
C16 ,17 CC73HCH1H101J CHIP C 100PF J
C18 CK73HB1E103K CHIP C 0.010UF K
C19CC73HCH1H101J CHIP C 100PF J
C20 CK73HB1H471K CHIP C 470PF K
C21 CK73HB1E103K CHIP C 0.010UF K
C23 CS77MA1VR15M CHIP TNTL 0.15UF 35WV
C24 CS77MA1D1R5M CHIP TNTL 1.5UF 20WV
C25 C93-1905-05 CHIP C 0.068UF J
C27 CK73HB1A224K CHIP C 0.22UF K
C28 CK73HB1H471K CHIP C 470PF K
C29,30 CC73HCH1H150J CHIP C 15PF J
C33 CC73HCH1H470J CHIP C 47PF J
C34 CK73HB1H471K CHIP C 470PF K
C35 CK73HB1E103K CHIP C 0.010UF K
C37 ,38 CK73HB1A104K CHIP C 0.10UF K
C39CK73HB1H471K CHIP C 470PF K
C41 CC73HCH1H101J CHIP C 100PF J
C43 CC73HCH1H101J CHIP C 100PF J
C44 CK73HB1H102K CHIP C 1000PF K
C45 CK73HB1H471K CHIP C 470PF K
C47 CC73HCH1H820J CHIP C 82PF J
C48 CC73HCH1H070B CHIP C 7.0PF B
C49CK73HB1H102K CHIP C 1000PF K
C50 CK73HB1A104K CHIP C 0.10UF K
C51 CC73HCH1H470J CHIP C 47PF J
C52 CC73HCH1H030B CHIP C 3.0PF B
C53 CC73HCH1H070B CHIP C 7.0PF B
C55 CK73FB0J106K CHIP C 10UF K
TK-P721
TX-RX UNIT (X57-7880-22)