Panasonic KX-TC1400B / KX-TC1400W Service Manual ▷ View online
17 CIRCUIT BOARD (Handset)
(Component View)
(Flow Solder Side View)
PQ
UP10908Z
RF – UNIT
FCT
ADJ
(TXPD)
CHECK
REF
(RXPD)
13
14
ICT
TALK
1
4
7
RINGER
PR
OGRAM
PA
USE
CH
MIC
REDIAL
FLASH
LOUD
2
5
8
0
3
6
9
AU
TO
R921
R915
R904
(455)
R906
LED902
LED903
R914
R920
R271
R272
D212
R922
1
12
DIRECT
1
1
2
2
3
3
4
4
1
5
2
6
3
7
CHG[C]
CHG[+]
CHG[–]
C202
C203
C907
C904
C901
C204
R206
R207
R221
R220
R902
R201
R204
R274
C208
R254
R240
R241
C251
C902
R205
C262
R260
R203
R905
R901
R913
R911
R908
R910
CHARGE
Q204
Q203
Q201
Q202
Q901
R223
C906
1
44
34
33
23
22
ID
BL
SO
SI
PD
RESET
CLOCK
RXD
AT
A
12
11
1
56
43
42
29
28
15
14
C205
D201
D202
X902
IC901
IC201
R208
C247
R234
R235
R231
C238
C239
C242
C236
C259
C244
R233
R232
C235
C240
C237
C234
C233
C231
C224
C905
C220
C221
C226
C223
C219
C213
C214
C228
C206
C225
C232
R280
R251
R229
R228
R210
R215
R217
R218
R213
R919
D901
C216
C217
C210
C212
C209
C218
R211
R209
R225
R224
TP212
MOD
SP–
SP+
TX
RX
VR201
VR202
D203
L203
L202
R202
R916
L201
D204
CN202
VDD
VSS
VSS
Vdd
VPP
MIC
C271
RINGER
TALK
SQL
AF
ANT
GND
REF
DIP
C268
C269
C270
RECHARGE
E
B
B
C
E
B
B
C
E
B
B
C
E
B
B
C
E
B
B
C
PQ
UP10908Z
X901
KX-TC1400B / KX-TC1400W
29
17.1. MEMO
KX-TC1400B / KX-TC1400W
30
18
BLOCK
BLOCK
DIAGR
AM
(Base
Unit)
18.1.
Main
P.C.
Board
IC201
IC401
9
X201
3.58MHz
3.58MHz
IN USE/CHARGE
58
47
59
46
LED201
5V
12
19
49
50
8
18
3
8
4
6
5
7
10
10
RX-POWER
CHARGE-DET.
CHARGE-CNT
TX-DATA
VDD
POWER-DOWN
RESET
BELL
RLY
TX-POWER
UNLOCK
PLL-CLK
PLL-DATA
PLL-EN
SQL
AF
MOD.
11
1
9
24
6
18
1
VR401
RX OUTPUT
ADJUST
(Line Modulation)
ADJUST
(Line Modulation)
LPF
COMPRESER
RX-MUTE
TX-MUTE
LPF
AMP
AMP
Q105
Q108
LIMITTER
AMP
SIDE-TONE
-CIRCUIT
-CIRCUIT
Q101
BELL-
DETECT
DETECT
IC401
RESET/POWER DOWN
Q351
Q102, Q103
TR-RLY
EXPANDER
DATA-AMP
VR402
TX OUTPUT
ADJUST
ADJUST
RX-POWER
TX-POWER
TX-DATA
RX-DATA
TX-MUTE
RX-MUTE
UNLOCK
PLL-CLK
PLL-DATA
PLL-EN
SQL
10
60
D205
D201
51
63
1
3
7
14
23
21
22
13
48
4
1
3
2
D101
1
2
TIP
RING
TEL-JACK
1
2
DC9V+
GND
DC-JACK
1
2
+
3
-
C
CHARGE-CONTACT
6V
REGULATOR
IC351
+ ~
- ~
ID BUFFER
Q353
CHARGE
DETECT
DETECT
Q352
CHARGE
CONTROL
CONTROL
LOCATOR
S201
KEYA
44
IC202
Q203
31
KX-
TC14
0
0
B
/
/
KX-
TC14
00
19 NEW CIRCUIT
OPERATION (Base Unit)
19.1. Power Supply Circuit
As indicated in the illustration, the various voltages are supplied
constantly to their respective blocks. A time constant is used to
compensate for momentary dropouts in the AC power supply.
constantly to their respective blocks. A time constant is used to
compensate for momentary dropouts in the AC power supply.
19.2. Charge Circuit
The voltage from the AC is supplied to the main charge circuits.
Normal charge (60mA) is started soon after the Handset is
placed on the base unit. After 15 hours the mode changes to
trickle charge (18 mA) to prevent overcharging.
Normal charge (60mA) is started soon after the Handset is
placed on the base unit. After 15 hours the mode changes to
trickle charge (18 mA) to prevent overcharging.
19.3. Bell Detector Circuit
When the CPU detects the Bell signal, pin 46 repeats High/Low
fluctuation and then IN USE LED (LED201) in use is flashed.
fluctuation and then IN USE LED (LED201) in use is flashed.
At this time, if the Handset has been charged, the data from pin
10 is sent through the control terminal and then the Handset´s
ringer rings.
10 is sent through the control terminal and then the Handset´s
ringer rings.
If the Handset has been not charged, the data signal generated
by pins 10 of the CPU is sent to the Handset through RF Unit
and then the Handset´s ringer rings.
by pins 10 of the CPU is sent to the Handset through RF Unit
and then the Handset´s ringer rings.
32
X-TC1400B / KX-TC1400W
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