Panasonic KX-TSC62SXB User manual

© Panasonic System Networks Co., Ltd. 2011
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KM41103334CE
Telephone Equipment
Model No. KX-TSC62SXB
KX-TSC62SXW
Integrated Telephone System
B: Black Version
W: White Version
(for India)
Caller ID Compatible

2
KX-TSC62SXB/KX-TSC62SXW
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general
public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting
to service a product. Products powered by electricity should be serviced or repaired only by experienced professional
technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone
else could result in serious injury or death.
IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are important for safety. These parts are marked by
in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that
these critical parts should be replaced with manufacturer's specified parts to prevent shock, fire or other hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT INFORMATION ABOUT LEAD FREE, (PbF), SOLDERING
If lead free solder was used in the manufacture of this product, the printed circuit boards will be marked PbF.
Standard leaded, (Pb), solder can be used as usual on boards without the PbF mark.
When this mark does appear, please read and follow the special instructions described in this manual on the
use of PbF and how it might be permissible to use Pb solder during service and repair work.
LWhen you note the serial number, write down all 11 digits. The serial number may be found on the bottom of the unit.
LThe illustrations in this Service Manual may vary slightly from the actual product.

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KX-TSC62SXB/KX-TSC62SXW
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions----------------------------------------------- 4
1.1. For Service Technicians --------------------------------- 4
2 Warning -------------------------------------------------------------- 4
2.1. About Lead Free Solder (Pbf: Pb free)--------------- 4
2.2. Discarding of P. C. Board-------------------------------- 5
3 Specifications ----------------------------------------------------- 6
4 Technical Descriptions ----------------------------------------- 7
4.1. Block Diagram---------------------------------------------- 7
4.2. Circuit Operation------------------------------------------- 8
5 Location of Controls and Components ------------------11
6 Installation Instructions ---------------------------------------11
7 Operating Instructions-----------------------------------------11
8 Troubleshooting Guide ----------------------------------------12
8.1. Service Hints-----------------------------------------------12
8.2. Set Dead----------------------------------------------------12
8.3. Pulse Dialing Problems ---------------------------------12
8.4. Tone Dialing Problems ----------------------------------13
8.5. No Ringing Sound When Ring Signal is Input ----13
9 Disassembly and Assembly Instructions ---------------14
9.1. Disassembly Instructions -------------------------------14
9.2. Assembly Instruction-------------------------------------16
10 Miscellaneous ----------------------------------------------------18
10.1. IC Block diagram -----------------------------------------18
10.2. How to Replace the Flat Package IC ----------------21
10.3. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------23
11 Schematic Diagram ---------------------------------------------24
11.1. For Schematic Diagram---------------------------------24
11.2. Schematic Diagram (Main)-----------------------------26
11.3. Schematic Diagram (Operation) ----------------------28
12 Printed Circuit Board-------------------------------------------29
12.1. Circuit Board (Main)--------------------------------------29
12.2. Circuit Board (Operation) -------------------------------31
13 Exploded View and Replacement Parts List -----------33
13.1. Cabinet and Electrical Parts ---------------------------33
13.2. Accessories -----------------------------------------------34
13.3. Replacement Part List-----------------------------------35

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KX-TSC62SXB/KX-TSC62SXW
1 Safety Precautions
1.1. For Service Technicians
•Repair service shall be provided in accordance with repair technology information such as service manual so as to pre-
vent fires, injury or electric shock, which can be caused by improper repair work.
1. When repair services are provided, neither the products nor their parts or members shall be remodeled.
2. If a lead wire assembly is supplied as a repair part, the lead wire assembly shall be replaced.
3. FASTON terminals shall be plugged straight in and unplugged straight out.
•ICs and LSIs are vulnerable to static electricity.
When repairing, the following precautions will help prevent recurring malfunctions.
1. Cover plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.
2Warning
2.1. About Lead Free Solder (Pbf: Pb free)
Note:
In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that con-
tains lead.
We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn),
Silver (Ag), and Copper (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder.
Caution
• PbF solder has a melting point that is 50 F ~ 70 F (30 C ~ 40 C) higher than Pb solder. Please use a soldering iron with tem-
perature control and adjust it to 700 F ± 20 F (370 C ± 10 C).
• Exercise care while using higher temperature soldering irons.:
Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB.
• PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100 F (600 C).
• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the
opposite side (See the figure below).
component
component
pin
solder
remove all of the
excess solder
slice view

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KX-TSC62SXB/KX-TSC62SXW
2.1.1. Suggested PbF Solder
There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper
(Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu) or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the manufac
turer's specific instructions for the melting points of their products and any precautions for using their product with other materi-
als. The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3 mm, 0.6 mm and 1.0 mm.
2.2. Discarding of P. C. Board
When discarding P. C. Board, delete all personal information such as telephone directory and caller list of scrap P. C. Board.
0.3mm X 100g 0.6mm X 100g 1.0mm X 100g

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KX-TSC62SXB/KX-TSC62SXW
3 Specifications
Note:
• Design and specifications are subject to change without notice.
Power Source: From telephone line
Memory Capacity: 30 Caller ID memory
Redial: The unit redials the last 5 dialed numbers
Microphone: Electret condenser microphone
Input Jack: Telephone Line
Approx. 202.5 mm x 76.5 mm x 130 mmDimensions (H x W x D):
Mass (weight): Approx. 453
Operating Enviroment: 0 oC - 40 oC, 20 % - 80 % relative air humidity (dry)
g
Speaker Unit: Unit: 5cm (2") PM Cone type 32
Handset: 3 cm (1
13
/ 16 ") PM dynamic type 150

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KX-TSC62SXB/KX-TSC62SXW
4 Technical Descriptions
4.1. Block Diagram
SP
MIC
KX-TSC62SX Series : BLOCK DIAGRAM
Keyboard
Switch
IC801
MICON
LCD
D808
X2
Handset
Sending
Amp
Q431, Q433
Handset Receiving
Amp
Q401
Sidetone
Bridge
Q301, Q302
Line
ON/OFF
W Circuit
ake Up Comparator
IC
DTMF CID &
Gain Control
Circuit
Ring Detect
Circuit
Q554
Q503
Power Supply
Circuit
Q101, Q102, Q103
SP
MIC
SP-Phone
Circuit
Q501, Q502
Q422
Ringer
IC
D101 T
R
R201 C201
D413
D106
Buzzer
DTMF
Vdd
Wakeup
FSKIn
DTMF_Gain_Cnt
Bell in
XIN XOUT Vss
DTMFIn
D601
IC501
IC201
IC601
(2AP)

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KX-TSC62SXB/KX-TSC62SXW
4.2. Circuit Operation
4.2.1. Bell Detector Circuit
When the bell signal is input from LINE to T/R (when the telephone rings), the signal is output at the buzzer via the following
path :
T/R C201 R201 IC201 (pin8) IC201 (pin5) R204 SW201 Buzzer
4.2.2. Telephone Line Interface
4.2.2.1. Circuit operation
•On hook
Q301 is OFF, on-hook condition where DC loop is disconnected and voice signal flow is cut.
•Off hook
During Off-Hook, pin 1-3 of SW301 and Q301 is ON, providing an off-hook condition (active DC current flow through the circuit)
and the following is the signal flow :
T POS101 L101 D101(+) Q301 Q401 R412 D413 D101(-) L102 R
•Receiving signal flows:
LINE Q301 C402 C431 R431 Q431 C434 C438 R443 Q433 C440 SP (handset)
•Transmission signal flows:
MIC (handset) C422 R422 R423 C425 Q422 C429 R429 Q401 Q301 LINE
•Pulse Dial
A pulse signal switches repeatedly between high and low logic is output from IC801 (pin 56), on and off the line loop, generating
the pulse dial signal.

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KX-TSC62SXB/KX-TSC62SXW
4.2.3. Speakerphone Circuit
4.2.3.1. Function
The circuit controls the automatic switching of the transmitted and received signals, to and from the telephone line, when the
unit is used in the hands -free mode.
4.2.3.2. Circuit Operation
The speakerphone can only provide a one-way communication path.
In other words, it can either transmit an outgoing signal or receive an incoming signal at a given time, but cannot do both simul-
taneously. Therefore, a switching circuit is necessary to control the flow of the outgoing and incoming signals.
This switching circuit is contained in IC601 and consists of a Voice Detector, TX Attenuator, RX Attenuator, Comparator and
Attenuator Control. The circuit analyzes whether the TX(transmit) or the RX(receive) signal is louder, and then it processed the
signals such that the louder signal is given precedence.
The Voice Detector provides a DC input to the Attenuator Control corresponding to the TX signal.
The Comparator receives a TX and a RX signal, and supplies a DC input to the Attenuator Control corresponding to the RX sig-
nal.
The Attenuator Control provides a control signal to the TX and the RX attenuator to switch the appropriate signals on and off.
The Attenuator Control also detects the level of the volume control to automatically adjust for changing ambient conditions.
1. Transmission signal path:
The input signal from the microphone is sent through the circuit via the following path: MIC Pin 9 of IC601 Pin 10 of
IC601 Pin 3 of IC601 Pin 4 of IC601 C602 R601 Q401 Tel line.
2. Reception signal path:
Signals receive from the telephone line are outputted at the speaker via the following path: Tel line Q431 C434 R600
C603 Pin 27 of IC601 Pin 26 of IC601 Pin 19 of IC601 Pin 15 of IC601 Speaker.
3. Transmission/Reception switching
The comparison result between TX and RX outputs as a DC level of Pin 25 of IC601. TX level is high ...... Pin 25 = Pin 21 -
6mV RX level is high ...... Pin 25 = Pin 21 - 150mVComparator output is connected to the attenuator control inside of IC601.
4. Voice detector
The output of the mic amp (Pin 10 of IC601) is supplied to Pin 13 of IC601 as a control signal for the voice detector.
5. Attenuator control
The attenuator control detects the setting of the volume control through Pin 24 of IC601 to automatically adjust for changing
ambient conditions.

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KX-TSC62SXB/KX-TSC62SXW
4.2.4. Caller ID Detect Circuit
4.2.4.1. Function (FSK Signal)
The caller ID is a changeable ID which the user of a telephone circuit obtains by entering a contract with the telephone company to
utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has been entered for
the circuit being used. The data for the caller ID from the telephone exchange is sent during the interval between the first and sec-
ond rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an FSK (Frequency
Shift Keying) format. Data "1" is a 1200 Hz sine wave, and data “0” a 2200 Hz sine wave. There are two types of the message for-
mat which can be received: i.e. the single message format and plural message format. The plural message format allows to trans-
mit the name and data code information in addition to the time and telephone number data.
•FSK (Frequency Shift Keying) format
4.2.4.2. Circuit Operation
Caller ID signal is sent through the circuit via the following path :
LINE C501/C521 C502/C522 R501/R521 Pin 2/3 of IC501 Pin 1 of IC501 R507 C507 Pin 6 of IC501
Pin 60 of IC801
STD Ring / 20Hz
Tip-Ring
FSK DATA in
1st Ring Silent interval 2nd Ring
DATA
0.1Vrms
70Vrms
1300Hz or
1200Hz
=DATA "1"
2100Hz or
2200Hz
=DATA "0"