DOWNLOAD Panasonic KX-TS85GB / KX-TS85GW Service Manual ↓ Size: 1.62 MB | Pages: 34 in PDF or view online for FREE

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9

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Fig. 1

Fig. 2

A

Remove the P.C. Board

Fig. 3

B

Shown in Fig—.

1

2

3

To remove—

.

Cabinet Cover

Main Printed Circuit Board

Operation Printed Circuit Board

Remove—

.

Screws (3

×

14) . . . . . . . . . . . . . (A)

×

5

Remove the P.C. Board

Screws (3

×

10) . . . . . . . . . . . . . (B)

×

5

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10

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•¡

•¡

•¡

•¡

•¡

1.  Temporary fix FLAT PACKAGE IC by soldering on two marked 2 pins.

*Most important matter is accurate setting of IC to the corresponding soldering foil.

2.  Apply flux for all pins of FLAT PACKAGE IC.

3.  Solder employing specified solder to direction of arrow, as sliding the soldering iron.

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•¡

•¡

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•¡

1.  Re-solder slightly on bridged portion.

2.  Remove remained solder along pins employing soldering iron as shown in below figure.

Soldering iron

bridge

Specified solder

Flux

Temporary soldering point.

•¡

•¡

•¡

•¡

•¡

•E

SOLDER

Sparkle Solder 115A-1, 115B-1

OR

Almit Solder KR-19, KR-19RMA

•E

Soldering iron

Recommended power consumption will be between 30 W to 40 W.
Temperature of Copper Rod 662 

•}

 50 

ß

F

 

(350 

•}

10

••

 )

(An expert may handle 60~80 W iron, but beginner might
damage foil by overheating.)

•E

Flux

HI115         Specific gravity 0.863

(Original flux will be replaced daily.)

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11

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IC1
Speech circuit, dialer and tone ringer
Memory: 21 digit 26 station
Clock frequency: 3.58MHz
Operating range: 15~100mA

CS2 

0

1

DPn 

0

2

HF 

0

3

HS 

0

4

FT1 

0

5

FT2 

0

6

M4 

0

7

M2 

0

8

M3 

0

9

M1 10

STB 11

CS 12

VSS 13

LI 14

RI 15

SS 16

LS 17

CI 18

RECI 19

RECV 20

RO 21

VDD 22

33 OSC

32 LED

31 FCI

30 Head

29 VSSA

28 LS2

27 LS1

26 VPP

25 CM

24 CBN

23 AGND

44 CS1

43 DO

42 DI

41 CLK

40 C4

39 C3

38 C2

37 C1

36 R3

35 R2

34 R1

YYWWAAA
AS2525
Austria

Pin

No.

Symbol

Function

CS2

DPn

HF

HS

FT1

FT2

M4

M2

M3

M1

STB

CS

VSS

LI

RI

ChipSelect 2
Chip select signal for external LCD driver circuit or 2mA LED.
If signal is not activated a pull down resistor (100kOhm) is inserted.

Dial Pulse Output
Digital output which holds the line during off-hook operation or pulls low during break periods of pulse
dialing and flash.

HandsFree Switch Input
This is an Schmitt-trigger input that is pulled high indicating handsfree operation.

HandSet Switch Input
This is an Schmitt-trigger input that is pulled high by the hook switch indicating handset or headset
operation.

Analog input pin for connecting a capacitor for offset cancellation.

Analog input pin for connecting a capacitor for offset cancellation.

Microphone Input 4
Differential input for the handsfree microphone (electret).

Microphone Input 2
Differential input for the handset microphone (electret).

Microphone Input 3
Differential input for the handsfree microphone (electret).

Microphone Input 1
Differential input for the handset microphone (electret).

Side Tone Balance Input
Analog input for side tone cancellation network.

Current Shunt Control Output
N-channel open drain output to control the external high power shunt transistor for synthesizing AC- and
DC-impedance, modulation of line voltage and shorting the line during make periods of pulse dialing.

Voltage Source Source
Negative Power Supply

Line Input
Analog input used for power extraction and line current sensing.

Receive Input
Analog input for ac-separated receive signal.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

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12

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Pin

No.

Symbol

Function

SS

LS

CI

RECI

RECV

RO

VDD

AGND

CBN

CM

VPP

LS1
LS2

VSSA

HEAD

FCI

LED

OSC

R1
R2
R3

C1
C2
C3
C4

CLK

DI

DO

CS1

16

17

18

19

20

21

22

23

24

25

26

27
28

29

30

31

32

33

34
35
36

37
38
39
40

41

42

43

44

Supply Source Control Output
N-channel open drain output to control the external high power source transistor for supplying (Vpp) the
loudspeaker amplifier in off-hook loudspeaking/handsfree mode.

Line Current Sense Input
Analog input for sensing the line current.

Complex Impedance Input
Analog input pin for the capacitor to program a complex impedance.

Analog input for the handsfree receive path. Schould be connected to RO via coupling capacitor.

Analog input for receive voice switching path.

Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150

Ω

 to 300

Ω

.

Voltage Drain Drain
Positive Power Supply

Analog Ground
Special ground for the internal amplifiers.

Analog Input pin for connecting a capacitor for background noise monitoring.

Converter Make Output
This is an output for controlling the external switching converter. During ringing it converts the ring signal
into a 4V supply voltage.

Loudspeaker Power Supply
High power supply for the output driver stage.

Loudspeaker Output 1
Output pins for a 32

Ω

 (25 to 50

Ω

) loudspeaker

Power supply pin for LS1-LS2 output amplifier.

HEADset Switch Input
Digital input for choosing handset and headset mode or choosing between LD and MF dialing. See section
“Service Code Programming 4” for further details. This pin is scanned only after manual OFF-HOOK.

Frequency Comparator Input
This is a Schmitt-trigger input for ring frequency discrimination. Disabled during off-hook.

LED Output
Digital output for connecting 2mA LED.

Oscillator Input
Input for ceramic resonator 3.58MHz.

Keyboard Rows
(see key arrangement)

Keyboard Columns
(see key arrangement)

Clock
Clock output of 3 wire bus. If signal is not activated a pull down resistor (100kOhm) is inserted.

DataInput
Data input of 3 wire bus. If signal is not activated a pull down resistor (100kOhm) is inserted.

DataOutput
Data output of 3 wire bus.
A 100k resistor connected from this pin to vss enables key-locking.
If signal is not activated a pull down resistor (100kOhm) is inserted.

ChipSelect 1
Chip select signal for external EEPROM.
If signal is not activated a pull down resistor (100kOhm) is inserted.