Panasonic KX-T7735UA / KX-T7735UA-B (serv.man3) Service Manual / Supplement ▷ View online
5
KX-T7735UA/KX-T7735UA-B
1.4.
HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED
Change from the Original Service Manual Section 1.2.
C24
C25
C
C43
C44
C45
C46
C47
C48
C49
C50
C51
C52
C53
C203
C54
C204
C55
C205
C56
C206
C57
C58
C59
C210
C60
C61
C62
C63
C213
C64
C214
C65
C215
C66
Q12
C67
Q13
SP+
Q14
C68
Q15
Q16
Q18
SP2
C71
C72
C73
C74
C75
C76
A5
A6
DG2
A8
C82
C84
C85
C86
SPN
B3
B5
AG
Q102
D4
D5
D6
D9
E5
DG
G1
G2
JK3
J2
R10
2
J3
R105
R106
R107
K1
D31
D32
D33
D34
M1
M2
M3
C103
N1
N4
N10
N11
N5 N6
N7
N8
N9
IC3
IC4
IC5
IC7
IC8
AG1
AG2
R20
D5V
R2
3
R25
R
2
R27
R28
Q6
R42
R43
R44
R45
R46
R47
R48
R49
R50
R51
R52
R54
R55
R56
R57
R58
R59
R60
R61
R62
R63
R64
R65
R66
R67
R68
R69
R70
R71
R72
R
7
R75
V1
R78
R79
R80
R82
R85
R86
R87
R88
R89
CN2
CN3
CN5
CN7
+6V
R201
IC11
R206
R207
1
28
14
15
1
8
5
4
1
7
14
6
PbF
PSUP1395X -C
E
PbF
PSUP1395X -B
PbF
5
8
1
R
W
8
R
W
R
W
PSUP1395X -A
E
KX-T7735UA/KX-T7735UA-B MAIN BOARD COMPONENT VIEW
Marked PbF
(around here)
Marked PbF (around here)
6
KX-T7735UA/KX-T7735UA-B
1.5.
DISASSEMBLY INSTRUCTIONS
Change from the Original Service Manual Section 6.
4. Disolder lead and pararell wire from the main board.
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KX-T7735UA/KX-T7735UA-B
1.6.
BLOCK DIAGRAM
Change from the Original Service Manual Section 7.
LED DRIVING
CIRCUIT
(Q105~108)
H
L
T
R
T2
POWER
REGULATOR
(IC7)
SIGNAL
TRANSMITTING
CIRCUIT(Q101)
SIGNAL
RECEIVING
CIRCUIT(Q102)
IC9
RESET IC
(IC2)
Vcc (5V)
CPU
(IC1)
X1
DRIVING
CIRCUIT
(Q103,Q104)
LED
LCD
KEY
LCD Module
RINGER
DTMF
SPEAKER
MIC
HEADSET
HANDSE
T
SP-PHONE
(IC3)
Handset Amp
(Q5,Q8)
Pre Amp
(Q4)
HYBRID
CIRCUIT
(Q3)
DIODE
BRIDGE
(D1)
DIODE
BRIDGE
(D2)
T1
KX-T7735U
A/KXT7735U
A-B MAIN BO
ARD
POWER
REGULATOR
(IC11)
Vcc (3.3V)
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KX-T7735UA/KX-T7735UA-B
1.7.
CIRCUIT OPERATIONS
1.7.1.
KEY INPUT CONTROL CIRCUIT
Change from the Original Service Manual Section 8.1.
Sequential input information is executed by dynamic scanning.
The ports P3_1, P3_6, P8_4~6, P8_1 of IC1 are brought to high status consecutively.
If a key is pressed, the key-in information input is executed by ports P2_1~7, P6_1~2.
The ports P3_1, P3_6, P8_4~6, P8_1 of IC1 are brought to high status consecutively.
If a key is pressed, the key-in information input is executed by ports P2_1~7, P6_1~2.
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