Read Panasonic KX-T7740X (serv.man2) Service Manual online
1.2. HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED
PbF is stamped to show that Pb free solder is used. (See the figure below.)
E4
B4
A4
A1
B1
A2
B2
B3
A3
A6
D5V
GND
T1
IC2
A7
IC3
C5
10
6
C1
R1
R2
D3
R15
5
1
1
7
C2
R8
R3
R4
8
14
C7
Q1
Q2
R6
D2
R7
C3
R5
A5
E5
B8
R
B6
B9
E1
E2
B7
B10
E3
L
T
H
D1
B5
Q11
IC1
32
33
48
49
64
C11
C9
R13
R14
R28
IC4
RA1
C12
C10
1
16
17
R21
R22
C13
C8
R10 R9
R11
R12
X1
R24
R23
R25
Q14 R27
JK1
R26
Q12
Q13
C4
C6
Q15
Q16
Q17
PSUP1383Z
A
KX-T7740X-B MAIN BOARD
COMPONENT VIEW
Marked PbF (PbF is marked around here)
PbF
4
KX-T7740X-B
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