Panasonic KX-TG4222CB User manual

© Panasonic System Networks Co., Ltd. 2013
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KM41303666CE
F1
Telephone Equipment
Model No. KX-TG4222CB
KX-TG313CSK
KX-TGA421CB
KX-TGA421CN
Digital Cordless Answering System
B: Black Version
N: Champagne Gold Version
(for Canada)
(Handset)
KX-TGA421 KX-TG4221
(Base Unit)
Caller ID Compatible
(Charger Unit)
Model No
Base Unit Handset Charger Unit Expandable
KX-TG4222
1 (TG4221) 2 (TGA421) 1 Up to 6
KX-TG313SK
1 (TG4221) 3 (TGA421) 2 Up to 6
Configuration for each model

2
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
WARNING
Thisservice information isdesigned for experienced repair techniciansonly and isnot designed for use by the general
public. It doesnot contain warningsor cautionsto advise non-technical individualsof potential dangersin attempting
to service aproduct. Productspowered by electricity should be serviced or repaired only by experienced professional
technicians. Any attempt to service or repair the product or productsdealt with in thisservice information by anyone
else could result in seriousinjury or death.
IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are important for safety. These parts are marked by
in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that
these critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT INFORMATION ABOUT LEAD FREE, (PbF), SOLDERING
If lead free solder was used in the manufacture of this product, the printed circuit boards will be marked PbF.
Standard leaded, (Pb), solder can be used as usual on boards without the PbF mark.
When this mark does appear, please read and follow the special instructions described in this manual on the
use of PbF and how it might be permissible to use Pb solder during service and repair work.
LWhen you note the serial number, write down all 11 digits. The serial number may be found on the bottom of the unit.
LThe illustrations in this Service Manual may vary slightly from the actual product.

3
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions----------------------------------------------- 4
1.1. For Service Technicians --------------------------------- 4
2 Warning -------------------------------------------------------------- 4
2.1. Battery Caution--------------------------------------------- 4
2.2. About Lead Free Solder (PbF: Pb free)-------------- 5
2.2.1. Suggested PbF Solder ------------------------------ 5
2.3. Discarding of P. C. Board-------------------------------- 5
3 Specifications ----------------------------------------------------- 6
4 Location of Controls and Components ------------------- 7
5 Installation Instructions ---------------------------------------- 7
6 Operating Instructions------------------------------------------ 7
7 Schematic Diagram ---------------------------------------------- 9
7.1. For Schematic Diagram---------------------------------- 9
7.1.1. Base Unit (Schematic Diagram (Base
Unit_Main)) --------------------------------------------- 9
7.1.2. Handset (Schematic Diagram
(Handset_Main)) -------------------------------------- 9
7.2. Schematic Diagram (Base Unit_Main) --------------10
7.3. Schematic Diagram (Base Unit_Operation) -------12
7.4. Schematic Diagram (Handset_Main) ----------------14
8 Exploded View and Replacement Parts List -----------16
8.1. Replacement Parts List ---------------------------------16

4
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
1 Safety Precautions
1.1. For Service Technicians
•Repair service shall be provided in accordance with repair technology information such as service manual so as to
prevent fires, injury or electric shock, which can be caused by improper repair work.
1. When repair services are provided, neither the products nor their parts or members shall be remodeled.
2. If a lead wire assembly is supplied as a repair part, the lead wire assembly shall be replaced.
3. FASTON terminals shall be plugged straight in and unplugged straight out.
•ICs and LSIs are vulnerable to static electricity.
When repairing, the following precautions will help prevent recurring malfunctions.
1. Cover plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.
2Warning
2.1. Battery Caution
Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according to the instructions.
Attention:
A nickel metal hydride battery that is recyclable powers the product you have purchased.
Please call 1-800-8-BATTERY (1-800-822-8837) for information on how to recycle this battery.

5
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
2.2. About Lead Free Solder (PbF: Pb free)
Note:
In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that
contains lead.
We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn),
Silver (Ag), and Copper (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder.
Caution
• PbF solder has a melting point that is 50 F ~ 70 F (30 C ~ 40 C) higher than Pb solder. Please use a soldering iron with
temperature control and adjust it to 700 F ± 20 F (370 C ± 10 C).
• Exercise care while using higher temperature soldering irons.:
Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB.
• PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100 F (600 C).
• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the
opposite side (See the figure below).
2.2.1. Suggested PbF Solder
There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper
(Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu), or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the
manufacturer's specific instructions for the melting points of their products and any precautions for using their product with other
materials.
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3 mm, 0.6 mm and 1.0 mm.
2.3. Discarding of P. C. Board
When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.
Component
Component
pin
Solder
Remove all of the
excess solder
(Slice View)
p
0.3mm X 100 g 0.6 mm X 100 g 1.0 mm X 100 g

6
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
3 Specifications
Note:
• Design and specifications are subject to change without notice.
Note for Service:
•Operation range: Up to 300 m outdoors, Up to 50 m indoors, depending on the condition.
•Analog telephone connection: Telephone Line
Power source
Receiving Method
Oscillation Method
Detecting Method
Tolerance of OSC Frequency
Modulation Method
ID Code
Ringer Equivalence No. (REN)
Dialing Mode
Redial
Speed Dialer
Power Consumption
Operating Conditions
Dimensions (H x W x D)
Mass (Weight)
AC Adaptor
(PNLV226Z, 120 V AC, 60 Hz)
Super Heterodyne
PLL synthesizer
Quadrature Discriminator
13.824 MHz ±100 Hz
Frequency Modulation
40 bit
0.1B
Standby: Approx. 0.7 W
Maximum: Approx. 3.5 W
0 °C - 40 °C (32 °F – 104 °F)
20 % – 80 % relative air humidity
(dry)
Approx. 53
mm ´ 96 mm ´ 136 mm
Approx. 150 g
Rechargeable Ni-MH battery
AAA (R03) size (1.2 V 400 mAh)
Super Heterodyne
PLL synthesizer
Quadrature Discriminator
10.368 MHz ±100 Hz
Frequency Modulation
40 bit
Tone (DTMF)/Pulse
Up to 48 digits
Up to 32 digits (Phonebook)
6 days at Standby,
10 hours at Talk
0 °C - 40 °C (32 °F – 104 °F)
20 % – 80 % relative air humidity
(dry)
Approx. 168
mm ´ 48 mm ´ 33 mm
Approx. 130 g
Base Unit Handset Charger
AC Adaptor
(PNLV233-AZ, 120 V AC, 60 Hz)
Standby: Approx. 0.1 W,
Maximum: Approx. 1.8 W
0 °C - 40 °C (32 °F – 104 °F)
20 % – 80 % relative air humidity
(dry)
Approx. 44 mm ´ 72 mm ´ 73 mm
Approx. 50 g
Duplex procedure:
TDMA (Time Division Multiple Access)
Channel spacing:
1,728 kHz
Bit rate:
1,152 kbit/s
Modulation:
GFSK (Gaussian Frequency Shift Keying)
RF transmission power:
115 mW (max.)
Voice coding:
ADPCM 32 kbit/s
N
N
N
N
N
N
NStandard:
DECT 6.0 (Digital Enhanced Cordless
Telecommunications 6.0)
NNumber of channels:
60 Duplex Channels
NFrequency range:
1.92 GHz to 1.93 GHz

7
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
4 Location of Controls and Components
Refer to the Operating Instructions.
Note:
You can download and refer to the Operating Instructions (Instruction book) on TSN Server.
5 Installation Instructions
Refer to the Operating Instructions.
Note:
You can download and refer to the Operating Instructions (Instruction book) on TSN Server.
6 Operating Instructions
Refer to the Operating Instructions.
Note:
You can download and refer to the Operating Instructions (Instruction book) on TSN Server.

8
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
Memo

9
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
7 Schematic Diagram
7.1. For Schematic Diagram
7.1.1. Base Unit (Schematic Diagram (Base Unit_Main))
Notes:
1. DC voltage measurements are taken with voltmeter from the negative voltage line.
2. The schematic diagrams may be modified at any time with the development of new technology.
7.1.2. Handset (Schematic Diagram (Handset_Main))
Notes:
1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.
2. The schematic diagrams may be modified at any time with the development of new technology.
Important Safety Notice:
Components identified by mark have special characteristics important for
safety. When replacing any of these components, use only the manufacture's
specified parts.

10
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
7.2. Schematic Diagram (Base Unit_Main)
NC: No Components
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
SHORT
URX
EEP_WP EEP_SDA EEP_SCL
JTAG_RTCK
ANS_LED
MSG_LED
MSG_LED
KEYS_E
JTAG_TDO
KEYS_D
KEYS_C
KEYIN3
KEYIN2
KEYIN1
JTAG_TDI
JTAG_TCK
JTAG_TMS
UTX
JTAG_TCK
JTAG_RTCK
JTAG_TDO JTAG_TMS JTAG_TDI
TXp
+3.0V
C517 0.1u
UGND
RSTN
C601 0.1u
TXn
RTCK
STM/CKM/P15
RXp
C518 0.1u
GND
VBAT
C508 10p
RXn
X501
13.824M
VDDC
C516 0.1u
R507
1k
+3.0V
LED_VDD
NC
R652 680
KEYS_C
KEYIN2
ANS_LED
KEYIN1
VBAT
KEYIN3
KEYS_E
KEYS_D
R651 680
MSG_LED
Q652
Q651
IC601
1
*CS
2
DO/IO1
6
CLK
7
*HOLD/IO3
3
*WP/IO2
8
VCC
4
GND
5
DI/IO0
D472 NC
AK
D473 NC
AK
C478 NC
C476 NC
C479 NC
C477 NC
C515
1u
R509 NC
C513 2.2u
D
N
GDN
G
VBAT
RXp
RXn
TXn
L803
2.7n
TXp
C895
2p
C897
NC
GND
GND
C819
10p
L804
NC
C896
NC
R506 10k R502 10k R503 10k R504 10k
TCK TMS TDI TDO
UTX URX
SW1
NC
1
2
SHORT1
SHORT2
SHORT4
SHORT5
45
TXp
46
RXp
47
RXn
48
GND_RF
49
TRSW_p
50
ANT_n
51
ATST_n
52
ATST_p
40
VDD_IF
41
VCC_FE
42
ANT
43
TRSW_n
44
TXn
53
TEST
54
RSTN
55
NC
56
VCC_VCO
57
GPIO[27]
58
VDDUSB
59
DM_USB/GPI28
60
DP_USB/GPI29
61
VDDC1
62
JTAG_TDO
63
JTAG_TDI
64
JTAG_TCK
65
JTAG_TMS
66
JTAG_RTCK
67
GPIO[0]/SCL_IIC
68
GPIO[1]/SDA_IIC
69
GPIO[2]
70
GPIO[3]
71
GPIO[4]
GND
GND
SHORT6
GND
ANT1
12
GND
GND
SHORT3
GND
C871 1.5p
C872
1.3p
C873
2p
C874
15p
TO RF BLOCK
1
10
open-stub
SL
W=2.0mm
L=10.8mm
SL
W=0.3mm
L=6.5mm
Tx-balun
SL
W=0.3
L=40mm
MSL
Wm=0.4mm
Lm=10mm
FbB"
C=2.5pF
7.3mm2
open-stub
SL
W=0.6mm
L=20mm
open-stub
SL
W=2.9mm
L=3.8mm
SL
W=0.3mm
L=12.45mm
Pre-matching
MSL
W=0.25
L=2mm
SL
W=0.3mm
L=6.95mm
SL
W=0.2mm
L=20mm
open-stub
SL
W=2.2mm
L=5.0mm
FbB"
C=2.5pF
7.3mm2
MSL
W=0.25
L=2mm
RF Block
SPP
SPN
W 0.15mm
L 6.2mm
1st layer
ANT-
Pattern
W 0.2mm
L 3.8mm
1st layer
SHORT
SHORT
SHORT
SHORT
SHORT

11
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
KX-TG4221C SCHEMATIC DIAGRAM (Base Unit_Main)
NC: No Components
(1)
(2)
(3)
(4)
(6)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(18)
(17)
(5)
(7)
1.2V
3.0V
Rx Tx
Caller ID
Bell
UTX
URX
SPI_CLK SPI_DO SPI_DI
BELL
HOOK
HOOK
SPI_CLK
SPI_DO SPI_DI
BELL
KEYS_C
SPI_CS KEYIN2 KEYIN3
KEYS_D
KEYIN1
SPI_CS
KEYS_E
ANS_LED
EEP_WP
EEP_SCL EEP_SDA
C120
1000p
ZA1 NC
12
6
79
11
810
12
R131 10M
L1R
+5.5V
C351
1u
C133 NC
R133 330k
C611 0.1u
R501 10
VDDC
C331 NC
DCP
C521 1u
C111 0.047u
R141
100k
+3.0V
C142 K0.01u
C509 12p
C124 NC
C151 NC
L1T
DCM
C132 K0.01u
VBAT
+3.0V
+3.0V
VCCA
+5.5V
+3.0V
+3.0V
R112 100k
C185
NC
R113 10k
C522
NC
+3.0V
F301
3.0A
CHARGE-
C186
10p
R142
2.7k
C504 1u
C123 NC
R145 2.2k
R111 100k
GND
L501
100n
C113
K0.68u
R121 390k
C519
0.1u
+5.5V
R122 390k
CHARGE+
C112 0.047u
+5.5V
C501
0.1u
C520
0.1u
VDDC
HAK_CL1
CHG+
GND
R322
100
R321
140
IC302
3
IN
2
OUT1
1
ADJ
4
OUT2
D361
NC
AK
C502
10u
C503
10u
C505 10u
C511 10u
D362
1SR154
AK
Q142
BC
E
*SA101
300V
SA103
NC
21
Q111
D113
AK
D133
AK
D153 NC
AK
R164
2.7k
R161
100k
C168NC
R151
100k
C152 0.01u
R177
1k
Q171
Q161
B
C
E
C161 10u
R165 27k
+3.0V
C164 NC
R331
68k
R332
33k
RA611
3.3k
1 2 3 4
6 7 8
RA151
1k
1
23
4
L474 NC L476 NC
C342 0.1u
C181 NC
C184
1u
C321 1u
C506
1u
C510 1u
C163 NC
D101
1
43
2
C507
2.2u
R510
10k
IC611
1
A0
2
A1
6
SCL
7
WP
3
A2
8
VCC
4
GND
5
SDA
C341 330u
C101 680p
C102 680p
C121 680p
C122 680p
R163 39
R152 130k
R176
1k
R175
3.9k
R172 680k
R371
1
R372
1
VREF
VCCA
VDDC
C176 1u
R114
47k
1
2
*D142
25V
1
GPIO[20]
2
GPIO[21]
23
MIP
3
GPIO[22]
4
GPIO[23]
5
GPIO[24]
6
GPIO[25]
7
GPIO[26]
8
VDDC2
24
HSMIN
25
HSMIP
26
MPWR
27
HSSPOUTP
28
LOUT
29
SPOUTN
30
VCCPA
81
GPIO[13]
82
GPIO[14]
83
GPIO[15]
84
GPIO[16]
85
GPIO[17]
86
VDDIO2
87
GPIO[18]
88
GPIO[19]
89
9
COREOUT
10
VBAT
11
DOUBCAPN1
12
DOUBCAPN
13
DOUBCAPP
14
DOUBCAPP1
15
DOUBOUT
16
DCIN0/LIN0
17
DCIN1
18
DCIN2
19
DCIN3/LIN1
20
VREF
21
VCCA
22
MIN
31
SPOUTP
32
PWM1
33
PWM0
34
DCINS
35
XOUT
36
XIN
37
VBAT_APU
38
VDD_APU
39
VCC_IF
72
GPIO[5]
73
GPIO[6]
74
GPIO[7]
75
GPIO[8]
76
VDDIO1
77
GPIO[9]
78
GPIO[10]
79
GPIO[11]
80
GPIO[12]
C173
0.1u
C167
1000pC171
0.022u
C175 560p
C178
0.033u
R160
820
R171 220
R168
4.7k
*R115
NC
*C115 NC
*P101
*Q141
*D143
NC
*SA102
NC
*R162
47k
(YELLOW)
(GREEN)
GND
*IC501
5
3
3
54
REFERENCE
7XX : FOR DK/BT
3XX : POWER, CHARGE
5XX : BBIC
6XX : FLASH, EEPROM, KEY, LCD
4XX : MIC, SP
1XX : TEL LINE
XX : RF
!

12
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
7.3. Schematic Diagram (Base Unit_Operation)
KX-TG4221C SCHEMATIC DIAGRAM (Base Unit_Operation)
NC: No Components
ANS1
12
STOP
12
ERASE
12
MSG2
12
MSG1
12
RPT
12
SKIP
12
UP
12
DOWN
12
LOCAT/INT
12
LED902
AK
LED901
AK
MEG_LED
KEYIN2
KEYS_B
ANS_LED
KEYS_E
KEYS_C
KEYIN1
2APVCC
KEYIN3
KEYS_D

13
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
Memo

14
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
7.4. Schematic Diagram (Handset_Main)
COL2
COL3
ROW2 ROW3
COL4
COL1
ROW1
LCD_CD
LCD_SCL
LCD_SDA
BELL_LED
LCD_RESET
COL1 COL2 COL3 COL4
COL5
CHARGE
COL0
BELL_LED
LCD_CSB
CHARGE_CTRL
SOCp
LDO_CTRL
ROW0
COL5
SOCn
ROW1 ROW2 ROW3 ROW0
LCD_RESET
LCD_CD
LCD_SCL
LCD_SDA
LCD_CSB
URX
POWER
GND
GND
R66 1k R64 10k
GND
C172
K0.1u
GND
R63 100
JTAG
RA61
220
1
23
4
UTX
+1.8V
C138
NC
GND
GND
LED12
C139
NC
RF_TXn
RF_TXp
RF_RXn
RF_RXp
TXON
RXON
C44
K0.1u
R203
56k
F
GND
C41
NC
C43D10p
C47
K1u
C17 D10p
C11 K0.1u
C18 D10p
RA4
3.3k
C13 K0.1u
C147 NC
GND
GND
R7 1.2k
BATT-
R30 1.5k
GND
R3
1k
C35 39p
VBAT
GND
R45 0.1
C121
NC
GND
VBAT
C3
NC
BATT+
GNDGND
GND
C46 D 10p
VBAT
+1.8V RA1
NC
C59 NC
GNDGND GND
C57 NC
GND
C58 NC C56 NC
STM
R20
10
C52 K10u
CP_LED
C53 K10u
CPLED
C54 D10p
CP+3.0V
C51 K1u
C55
NC
C45
K0.1u
C40 k0.1u
CP+3.0V
C107 NC
R233 NC
GND
R52 1k
R232 NC
C203 NC
R55 1k
GND
C106 NC
R51 470
C105 100p
R50 10k
C200 NC
GND
R54 10k R53 3.3k
GND
C206 NC
C103 100p
F1
2.5A
LED21
CP_LED
LED22 LED23
CHG(+)
CHG(-) RA40
3.3k
1 2 3 45
6 7 8
E_SDA
E_SCLK
E_WP
RST
CHG-
CHG+
R231 NC
C201 K1u
GND
TALK
1 2
1
1 2
SHARP
1 2
6
1 2 1 2
AST
1 2
4
1 2
8
12
3
0
1 2
9
1 2
SP
12
2
12
5
12
7
1 2
SOFT_C
1 2
SOFT_B
1 2
SOFT_A
1 2
R
12
GND
C205 NC
GNDGNDGND
CP+3.0V
C866
1u
C341
NC
C342
10p
GND
C340
NC
C344
0.1u
C345
NC
GND GND
CP+3.0V
GND
C150
16V
NC
CN51
9
VOUT
CN51
6
VDD
CN51
2
RS
CN51
10
CAP2-
CN51
13
CAP1+
CN51
7
V0
CN51
11
CAP2+
CN51
4
SI
CN51
5
SCL
CN51
16
GND
CN51
12
CAP1-
CN51
3
/CS
CN51
14
VSS
CN51
8
VR
CN51
1
GND
CN51
15
/RES
DOWN
12
UP
1 2
LEFT
1 2
RIGHT
1 2
D1
CKM
CP3V
X1
10.368M 1
32
R2 NC
R6 NC
R4 NC
C204 0.1u
Q2
Q9
C5
NC
R8
100
Q4
R31 100
D7
C1
220u
6.3
C2
220u
6.3
C7
NC
GND
IC3
16K
1NC1
2NC2
3NC3
4VSS 5
SDA
6
SCL
7
*WC
8
VCC
R57
120
RA32
120
1 2
3 4
IC5
1VSS_LNA1 2RF_RXn 3RF_RXp 4VSS_LNA2 5RFP1 6RFP0 7REF_RES 8AVS_XTAL 9XTAL2
10 XTAL1 11 AVD_XTAL 12 RF_SUPPLY1 13 PARADET/P3_4 14
RINGOUT/RINGING/P3_5
15 RINGn/P3_6 16 RINGp/P3_7 17 CIDINp/P3_2 18 VREFp 19 CIDINn/MICp 20 CIDOUT/MICn 41
VBAT
42
CP_C2y
43
CP_VOUT1
44
CP_VOUT2
45
PON/P1_6
46
VDD1
47
P2_7/BXTAL
48
P1_5/INT5/RDI/VDDE
49
P1_4/INT4/TDOD
50
P1_3/INT3/SIO
51
P1_2/INT2/SK
52
P1_1/INT1/LE
53
P2_6/WTF_IN
54
P0_7/SPI_DI/PWM1
55
P0_6/SPI_DO
56
P0_5/SPI_CLK
57
P0_4/SPI_EN
58
P0_3/SCL2/URX2
59
P0_2/SDA2/UTX2
60
P0_1/URX/PWM0
61
P0_0/UTX
62 RSTn
63 JTAG
64 P2_5/PCM_FSC/SF
65 P2_4/SCL1/PCM_DO/DP3
66
P2_3/SDA1/PCM_DI/DP2
67
P2_2/PCM_CLK/CLK100
68 WLED_CUR_0
69 WLED_CUR_1
70 WLED_CUR_2
71
P2_1/ECZ2/PWM1/LED4
72
P2_0/ECZ1/PWM0/LED3
73 VDD2
74 LDORF_CTRL
75 RFP0n
76 RF_SUPPLY2
77 RF_SUPPLY_PA
78 RF_TXn
79 RF_TXp
80 RFP2
93
GND1
C104 10p
C865
10p
BELL LED
(Amber)
TO RF BLOCK
To Charge
Terminal
To Battery
LCD_BACKLIGHT
(US:Amber)
(1)
(2)
(3)
(4)
(5)
(7)
(6)
(9)
(10)
(8)
NC: No Components
Charge Current
TX _RF
RX _RF
*When "SFR" command isexecuted,
13.824MHz frequency will be output.
CP+3.0V
CP_LED
0.85V
1Vp-p
0V
!

15
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
CHARGE
CHARGE_CTRL
COL0
LDO_CTRL
SOCn
SOCp
RF_RXp
RF_TXp
R807
220
GND
GND
VBAT
C826
1.1p
C803
1.5p
TXON
GND
GND
RF_RXn
GND
GND
C837
NC
R806
220
GND
GND
RXON
GND
RF_TXn
DA801
1
2
3
GND
GND
C823
100p
GND
GND
GND
C12
K10u
R27 820
R215
0
PCB
RE1
R28
820
CARBON_CL1
C73
NC
SP-PHONE_SPEAKER
+
-
C72
NC
GND
GND
C10
K2.2u
+1.8V
MIC+
VREFmVREFm
R74 82
MIC-
C113 D10p
R73 82
C74 D10p
RCV+
C152
K1000p
C71
NC
C70
NC
GND
RCV-
RECEIVER
+
-
L47
C38
NC
C49 K1u
C50
K1u
GND
VBAT
C188 K1u
C48 NC
VREFm
C96 D10p C97 D10p
C863 7p
C864 7p
GND GND GND
GND GNDGND
GND
GND
C189 39p
R23 1k
VREFm GND
GND
D3 NC
D4 NC
GND
S1
1 2
C75 10p
C99
10p
C98
10p
GND GND
GND
C190 K1u
GND
R94
1
R95
1
GND GND
GND GND
C95
1000p
C94
1000p
ANT1_TP
GND
1.8V
C805
2.4p
C806
2.7p
C810
1.1p
C813
1.1p
L802
5.1n
L803
5.1n
C809
100p
C820
0.5p
C804
2p
C802
2p
MIC AP1
1
2
ANT-Short
ANT-Short-GND
D21
4.3V
D22
4.3V
D13
4.3V
D14
4.3V
GND
C801
10p
R808
33
21
MICh
22
VREFm
23
LSRp
24
LSRn
25
AVD
26
LDO_CTRL
27
ADC0/P3_3
28
ADC1/INT0/P1_0
29
NTC/ADC2
30
SOCp
31
SOCn
32
CHARGE_CTRL
33
P1_7/CHARGE
34
DP1/PAOUTp/P3_1
35
VDD_PA
36
DP0/PAOUTn/P3_0
37
ULP_XTAL
38
CP_C1x
39
CP_C2x
40
CP_C1y
IC5
81 GND2
83 GND4
82 GND3
84 GND5
85 GND6
86 GND7
92
GND13 91
GND12 90
GND11 89
GND10 88
GND9 87
GND8
C36 39p
L46
C814
10p
C825
10p
C812
10p
C811
10p C822
10p
LSRp
LSRn
Test Pattarn for Carbon
MICp
MICn
RF BLOCK
(MAX500mA)
(1)
(2)
(3)
(4)
(5)
(7)
(6)
(9)
(10)
(8)
KX-TGA421C SCHEMATIC DIAGRAM (Handset_Main)
NC: No Components
1.8V
Handset RX
Handset TX/Sp-phone TX
Sp-phone RX
RX_RF
TX_RF

16
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
8 Exploded View and Replacement Parts List
8.1. Replacement Parts List
1. RTL (Retention Time Limited)
Note:
The “RTL” marking indicates that its Retention Time is Limited.
When production is discontinued, this item will continue to be available only for a specific period of time.
This period of time depends on the type of item, and the local laws governing parts and product retention. At the end of
this period, the item will no longer be available.
2. Important safety notice
Components identified by the mark indicates special characteristics important for safety. When replacing any of these
components, only use specified manufacture's parts.
3. ISO code (Example: ABS-94HB) of the remarks column shows quality of the material and a flame resisting grade about
plastics.
Note:
(*1) You can download and refer to the Operating Instructions (Instruction book) on TSN Server.
Safety Ref.
No.
Part No. Part Name & Description Remarks
A1 PNLV226Z AC ADAPTOR
A2 PQJA10075Z CORD, TELEPHONE
A3 PQKL10088Z1 STAND, WALLMOUNT (for KX-TG4222CB) ABS-HB
A3 PQKL10088Z3 STAND, WALLMOUNT (for KX-TG313CSK) ABS-HB
A4 PNQX6007Z INSTRUCTION BOOK (ENG)(*1)
A5 PNQX6008Z INSTRUCTION BOOK (FRE)(*1)
A6 PNLC1041ZB CHARGER UNIT (for KX-TG4222CB)
A6 PNLC1041ZN CHARGER UNIT (for KX-TG313CSK)
A7 PNKK1038Z1 LID, BATTERY (for KX-TGA421CB) ABS-HB
A7 PNKK1038Z2 LID, BATTERY (for KX-TGA421CN) ABS-HB
A8 PNHS1079Z SPACER
A7
A6
A1 A2 A4, A5A3
A8*
* Attached the Spacer to the exact location
describe below.
Spacer (No. A8)
Battery cover
Put it in the center.
Stick it between
ribs.

17
KX-TG4222CB/KX-TG313CSK/KX-TGA421CB/KX-TGA421CN
MIN
KXTG4222CB
KXTG313CSK
KXTGA421CB
KXTGA421CN