DOWNLOAD Panasonic KX-TS2356UAB / KX-TS2356UAW (serv.man3) Service Manual ↓ Size: 1.27 MB | Pages: 46 in PDF or view online for FREE

25

122

SEG0/STB0

D.O

SEG0/

KeyStrobe0

CMOS

CMOS

CMOS

CMOS

123

SEG1/STB1

D.O

SEG1/

KeyStrobe1

CMOS

CMOS

CMOS

CMOS

124

SEG2/STB2

D.O

SEG2/

KeyStrobe2

CMOS

CMOS

CMOS

CMOS

125

SEG3/STB3

D.O

SEG3/

KeyStrobe3

CMOS

CMOS

CMOS

CMOS

126

NC

-

-

-

-

-

-

127

NC

-

-

-

-

-

-

128

NC

-

-

-

-

-

-

Pin No.

Description

I/O

Connection

Normal

Standby

Stop

Reset

26

27

1. SCK

SCK terminal is input terminal of Serial Clock to control transmit and receipt between Master and Slave.

2. SDA

SDA terminal is input terminal, to forward the address and the mutual data between Master Device and Slave Device the
mutual.
This terminal needs the pull-up resistance external because output circuit of SDA uses Open Drain. 

3. A0, A1, A2

A0, A1, and A2 terminal is not used.

4. WP

WP terminal controls writing action. It is possible to do only reading action when high level input and it is possible to do read-
ing and writing action when low level input.

28

Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a
soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.

• PbF (: Pb free) Solder
• Soldering Iron

Tip Temperature of 700

°F ± 20°F (370°C ± 10°C)

Note: We recommend a 30 to 40 Watt soldering iron. An expert may be able to use a 60 to 80 Watt iron where someone with
less experience could overheat and damage the PCB foil.

• Flux

Recommended Flux: Specific Gravity 

→ 0.82.

Type 

→ RMA (lower residue, non-cleaning type)

Note: See About Lead Free Solder (PbF: Pb free) (P.4).

1. Put plenty of solder on the IC pins so that the pins can be completely covered.

If the IC pins are not soldered enough, you may give pressure to the P.C. board when cutting the pins with a cutter.

2. Make a few cuts into the joint (between the IC and its pins) first and then cut off the pins thoroughly.

3. While the solder melts, remove it together with the IC pins.

When you attach a new IC to the board, remove all solder left on the land with some tools like a soldering wire. If some solder is left
at the joint on the board, the new IC will not be attached properly.