Panasonic KX-1T7533G User manual

ORDER NO. KMS9808296C2
Manual
DIGITAL PROPRIETARY TELEPHONE
FOR DIGITAL SUPER HYBRID SYSTEM
KX-1T7533G
KX-1T7533G-B
Black Version
(for Germany)
Service
@ SPECIFICATIONS
Station Loop Limit: 40 ohms
Cabling Method: 2 pair wire
Jacks: PABX, Handset/Headset, Telephone
Display: 16 digits (max.)
Dimensions: 224 (W)x88 (H)x265 (D) mm with handset
Weight: 1.2 kg
Design and specifications are subject to change without notice.
A\ 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.
a
©1998 Kyushu Matsushita Electric Co., Ltd.
| All rights reserved. Unauthorized copying and distribution is a violatin of law.

KX-1T7533G/KX-T7533G-B
When you note the serial number, write down all of the 11 digits. The serial number may be found on the label affixed to the bottom of the unit.
TABLE OF CONTENTS
Page Page
FOR SERVICE TECHNICIANS 1.0... eee eeeeeeeeeeeees 2 HOW TO REPLACE THE FLAT PACKAGE IC........... 30
LOCATION OF CONTROLS ....... ce eeceeseeseseeteeceeeeeeens 3 PRINTED CIRCUIT BOARD ........ceccccestesteertentens 33, 40
DISASSEMBLY INSTRUCTIONS ....... eee ccseteeeeeeees 4 WAVEFORM on. cccoi scescetcdeesicscpeceses cassesbsneaaageaiveneeargieedae 35
ICS DATA arose cectceeieciihe ie ahaa Rie stesiastepbdaterens 6 SCHEMATIC DIAGRAM ........cscesceseceeeeensessseeesereneees 39
BLOCK DIAGRAM .........::ccesscscseeseseseesesseseeeeneesnsseeeenes 11 CABINET AND ELECTRICAL PARTS LOCATION ... 41
CIRCUIT OPERATIONS ...... cee eeeeeeeeeeneesseseeneeeenes 12 ACCESSORIES AND PACKING MATERIALS .......... 42
TROUBLESHOOTING GUIDE .........cccceceeseseceeeeees 24 REPLACEMENT PARTS LIST .......cccccccsseseeseeseeeneees 43
TERMINAL GUIDE OF IC’S TRANSISTORS,
AND DIODES...... 29
FOR SERVICE TECHNICIANS
~_
. Note the following items when exchanging the LEDs (Ref. No. D100-117, 130, 201) of Dial P.C. Board.
1) Do not reuse a LED which is removed from the P.C. Board.
2) Use a soldering iron (less than 15 W) for exchanging LED.
3) Do not heat the LED for more than 2 seconds.
4) Do not move the LED after soldering.
2. This unit employs the switch which is influenced by the light for the hook switch. When you open the cabinet to repair
the unit in the bright light, the hook switch might work improperly. Therefore, take care not to shine the hook switch
directly, or use the jig as shown below.
JIG (Part No. PSHG1176Z)
SW 1 (HOOK SWITCH)

LOCATION OF CONTROLS
Program Button LCD (Liquid Crystal Display)
Intercom Button
Conference Button
Soft Button (S1 through $3)
Shift Button
FWD/DND Button
(Call Forwarding/Do not Disturb)
Message Button
Flash Button
Pause Button Flexible Outside (CO)
Line Button
Auto Dial/Store Button
Auto Answer/Mute Button
Transfer Button
Redial Button
Jog Dial
Microphone
Hold Button
Speakerphone Button

DISASSEMBLY INSTRUCTIONS
HOW TO REMOVE THE LOVER CABINET
1
1) Remove the 4 screws@®.
2) Remove the lower cabinet.
HOW TO REMOVE THE HOOK BUTTON
Procedure
1-2
1) Remove the hook button.
HOOK BUTTON
HOW TO ATTACH THE SPRING
SPRING
HOOK BUTTON

KX-T7533G/KX-T7533G-B
No. 3
Procedure
172-3
H
OW TO REMOVE THE SWITCH AND MAIN BOARDS
) Remove the screw@).
) Pull out the switch board connector.
) Remove the switch board.
)
)
Pull out the flat cable.
Remove the 2 screws@).
) Pull out the speaker and microphone connectors.
7) Remove the main board.
1
2
3
4
5
6
CONNECTOR
HOW TO REMOVE THE LCD BOARD
Procedure
1) Pull out the flat cable. (See Fig. 1)
2) Remove the LCD block. (See Fig.2)
3) Remove the 2 screws @.
4) Remove the lower cabinet.
5) Remove the LCD board.

KX-1T7533G/KX-T7533G-B
1.101
Pin | Dir. _|_Pull Up
DBS = TT
DB2 bidi
IC DATA
| to | Act. | Block _|
PTSBO3
Data Bus [2]
Data Bus [1]
2.0 Data Bus [0]
input
input | 12-38k Ptsp01u |_ 2.0
CSN | 8 | input| -- | pT5D01 | 1.0 | Chip Select
REN | 10 | input PTSD01U | 2.0 | Read Enable Command
WEN | 9 PTS5DO1U| 2.0 | Write Enable Command
RST 63 | input _ PC5D21 | 0.01 | Asynchronous Reset Input
INTON 11 | output — PC5001 0.01 Interrupt Request
INTIN 12 | output 0.01 | Interrupt Request
DRO 38 | input — | pcspo1 | 0.6 | Dpits Receive Data [1]}
DR1 39 | input | pcspot | o6 | Dpits Receive Data [0]
DXO 40 | output oa | Pcsoo2 | 0.6 | Dpits Transmit Data [1]
DX1__|_ 41 | output ee : Dpits Transmit Data [0]
CK512K | 37 | output| Dpits Bit Rate Clock
SRO 19 | input | 12-38k TTL — PTSDO1U | 0.1 | Serial Receive Data Strear [0]
input | 12-38k C TTL = 0.1 | Serial Receive Data Stream [1]
| sx | 21 | =a aa CMOS 4.0mA 0.1 Serial Transmit Data Strearn
output - CMOS 4.0mA | high | PC5002 2.1 Serial Stream Clock
| ePo | 13 [output] — ' CMOS 2.0mA 0.01 | Extermal Channel Pulse [0
EP 4 14 | output -s- CMOS 2.0mA | high | PC5001 | 0.01 | External Channel Pulse [1]
EP2 15 | output -- CMOS 2.0mA | high | PC5001 | 0.01 | External Channel Pulse [2|
-6

KX-T7533G/KX-T7533G-B
Name Pin | Dir. Pull Up | Type lo Act. Block MHz Descriptions
EP3 16 | output --- CMOS high | PCSOO1 | 0.01 External Channel Pulse [3]
Pl 61 | input --- CMOS schmidt --- high | PC5D21 | 0.01 Rotary Encoder Input [Pos]
| input |---| CMOS schmidt | -- _| high | PC5D21 | 0.01 | Rotary Encoder Input [Neg]
ued} =] GMS 4.0mA 0.01 | LED Column Drive [0]
output CMOS 4.0mA | high | PC5002 | 0.01 LED Column Drive [1]
CLM2 sf sat ih 8008 J 0.01 | LED Column Drive [2]
CLM3 CMOS 0.01 | LED Column Drive [3]
CLM4 0.01 | LED Column Drive [4]
NROWO CMOS 4.0mA low PC5002 | 0.01 LED Row Drive [0]
NROW1 ef Be low | PC5002 | 0.01 | LED Row Drive [1]
| NROW2 | 52 | output} --- | CMOS tow | PC5002 | 0.01 | LED Row Drive [2] =
| NROWS | 53 | output} -- | = CMos | iow | PC5O02 | 0.01 | LED Row Drive [3]
| NROw4 | 54 [output| | cmos low 0.01 | LED Row Drive [4)
| NROWS | 55 |output| -- | cmos | 4.0ma | low | Pcsoo2 | 0.01 | LED Row Drive [5] |
| nROws | 56 | output] -- | cmos | 4.0ma | low | Pcsooz | 0.01 | LED Row Drive [6]
| NROw7 | 57 | output] -- | cmos | 4.0ma | tow | Pcs002 | 0.01 | LED Row Drive [71
| NROWs | 58 | output] --- | CMOS PC5002 LED Row Drive [8]
| NROws | 59 | output| | __CMos PC5002
| ipo | 27 | input | 12-38k | CMOS - PCSDO1U
| tpi [ 28 | input | 12-30 | cmos | | high [Pcspotu| 0.01 | inputPon ty)
0 ine)
input | 12-36k | cmos | -~ [high |Pcspotu| 0.01 | Input Pot fa)
30 | input | 12sec | cmos | | high [Posporu| 0.01 | inputPon is)
[23 |output| | CMos | 4.0ma | high | PCSO02 | 0.01 | Output Port (0)
U
wo
opi [24 |output| | CMOS | 4.0mA | high | PCSO02 | 0.01 | Output Port [1]
ope | 25 fouput[ | cmos | 4.0ma | high | Pcsoo2 | 0.01 | OutputPonia)
| ops | 26 [output| |= cMOS | 4.0ma | high | PC5O02 | 0.01 | Output Port [3]
| kak | 22 [output] | cmos | 4.0ma | high | Pcsoo2 | 0.20 | 2kH2 Clock Output (duty25%)_|
CK16M CMOS high | PC5001 | 16.4 | Master Clock Out
OS Analog PC5xX02 | 16.4 | X'tal in (XIN)
Analog PC5X02 16.4 | X'tal Out (XOUT)
not used
oO c is
no)
Cc
*
er en
as a
| || not used
vDD1
|
|
Vda
6)
| || ved vy
vpp3_| 49 | vdd a
VSSi Hes (60)
|__| Vss (GND)
vss Vss (GND)
a7

KX-T7533G/KX-T7533G-B
2.1C2
VREFDA
AG1
NO. /O
Analog
output
Classification
APMP 1 | Analog | Analog
input
Power
supply, etc.
Power
supply, etc.
Analog
Power
Function
Non-inverting input terminal of microphone amplifier M1.
Connect to the microphone.
Reference voltage terminal of DAC.
Connect the capacitor of 40uF between this terminal and pin 9(AG2).
Ground terminal of the analog circuit.
Output terminal for the handset receiver.
HO+ terminal and HO- terminal are biased to Vdd/2 voltage.
HO- terminal is the inverse porality output terminal for pin 4 (HO+).
Connect the capacitor in series between the handset and these terminals to
cut the DC.
Use the nonpolar type capacitor.
5V power supply terminal of analog circuit.
Output terminal for the speaker amplifier.
Connect to the external speaker amplifier input terminal.
SPO terminal is biased to Vdd/2 voltage.
Connect the capacitor of 0.1yF in series between the externa! speaker
| amplifier input terminal and this terminal.
Ground terminal of the analog circuit.
supply, etc.
Micro-
computer
interface
Mode selection terminal of microcomputer interface. Inputting "O" selects
the serial mode, and "1" selects the parallel mode.
System reset terminal.
The system is reset when "0" is pressed.
Power
Supply, etc.
Ground terminal of the digital circuit.

KX-T7533G/KX-T7533G-B
: /O Classification Function
13 |3states | Output port | Outputs BITO signal of OPORT1 resistor.
Outputs BIT1 signal of OPORT1 resistor.
Fl
5V power supply terminal of digital circuit.
Outputs BIT2 signal of OPORT1 resistor.
Outputs BITS signal of OPORT1 resistor.
Outputs BIT4 signal of OPORT1 resistor.
Outputs BITS signal of OPORT1 resistor.
Outputs BIT6 signal of OPORT1 resistor.
Outputs BIT7 signal of OPORT1 resistor.
Output terminal for PCM data
Input terminal of Sync. signal for PCM interface. The frequency of input sync.
signal is 8 kHz.
Input terminal of shift clock pulse for PCM data. Input pulse frequency
range is 64 kHz~2.048 MHz.
PCM data (TXD terminal signal) is output at the positive edge.
PCM data (RXD terminal signal) is sampled at the negative edge.
The sampling is performed inside LSI.
Clock pulse output terminal. Output pulse frequency is 6.144MHz.
System reset (inputting "O" to -RESET terminal) doesn't stop this output.
Clock pulse output terminal which has selective frequencies.
The following 4 frequencies can be selected by resistor setting:
12.228, 4.096, 2.048, 1.536 (MHz)
System reset (inputting "O" to -RESET terminal) selects the frequency of
1.536MHz and doesn't stop this output.
Ground terminal of digital circuit.
Input terminal of oscillation circuit.
Connect the oscillator and resistor between this terminal and pin 30(0SCQ),
moreover, connect the capacitor between this terminal and digital ground to
Output terminal of oscillation circuit.
Connect the oscillator and resistor between this terminal and pin 29 (OSC)
moreover, connect the capacitor between this terminal and digital ground to
5V power supply terminal of digital circuit.
Outputs 8 kHz clock pulse which is synchronized with -FSYNC.
Connect to the digital ground.
SV power supply terminal of analog circuit.
Input terminal of TX handset signal.
Either this signal or the signal supplied to pin 49 (HI) is input to AD converter.
Reference voitage terminal of AD converter.
[Name NO
| OPO
OP1 14 | output
ia D5V1 15 --- Power
Supply, etc.
47 | output
a ue Output port
utpu
OPS ae
OP6 20
OP7 21
RXD 22 | TTL Input terminal for PCM data
input
TXD 23 | Output
—FSYNC 24 TE PCM
input interface
BCLK 25
MCLK 26 | Output Clock
CLKO 27
Power
supply, etc.
OSCI 29 Clock
make the oscillation circuit.
OSCO
make the oscillation circuit.
D5V2 Power
supply, etc.
—INT 44 | Output Micro-
computer
interface
TEST 45 | CMOS Power Test terminal
input supply, etc.
A5V3
HI Analog
VBB Power
supply, etc.
Connect the capacitor of 10uF between VBB terminal and pin 50 (AG3).

KX-T7533G/KX-T7533G-B
Name [NO.| 1/0 _ | Classification Function
ri 49 | Analog Analog Input terminal of TX microphone signal.
input Either this signal or the signal supplied to pin 47 (HI) is input to AD converter.
AG3 50 —- Power Ground terminal of analog circuit.
A5V4 51 supply, etc. | 5V power terminal of analog circuit.
AP2HO 52 | Analog Output terminal of microphone amplifier H2.
output Connect the capacitor of 0.1p:F to this terminal to cut the DC.
Inverting input terminal of microphone amplifier H2.
input Connect the capacitor of 0.1p1F to this terminal to cut the DC.
54 | Analog Output terminal of microphone amplifier H1.
output Connect the capacitor of 0.1pF to this terminal to cut the DC.
AP1HN 55 | Analog inverting input terminal of microphone amplifier H1.
Connect to the handset.
Non-inverting input terminal of microphone amplifier H1.
AP1HP 56 Analog
VREFM Reference voltage terminal of microphone amplifier.
Power Connect the capacitor of 40 uF between this terminal and pin 56 (MICG).
supply, Otc: Ground terminal of analog circuit.
As 59 | Analog
output
Anal
APMN 60 | Analog —
input
Output terminal of microphone amplifier.
Connect the capacitor of 0.1,F to this terminal to cut the DC.
Non-inverting input terminal of microphone amplifier M.
=f0=

SPEAKER
1C2(TEL Communication LSI)
CODEC (D--A/A>D)
SP-Phone CIRCUIT
HANDSET CIRCUIT
CATION
IC11,Q1,Q2
b: TONE GENELATOR
x1
LJ 16.384
|
MHz
PSUP1206ZA
(Main p.c.board)
DPITS
HANDSET | communi
'
-cation
:
LED
-5V
ee
w
INT
Control
CONVERTER
rm
AD,WT,ALE,
|
|
JOG
SW
©
D5~D7
Control
RO-R5
QO
A
DRIVING
=
D100~D1 =
2AP
tecccescoceeecccne
ss
Q3-a12
LEED
NSO>
"oh
>
(LCD
p.c.board)
CO~C5
ae
QQ
17533:PSUP1178ZA
!
esate
0
>
LCD
PANEL
=» KX-T7545CE
17533
(16x3)
CK2K
A
a
=f
=~]
a
Ww
2
A
<
=|
“NI
On
a)
Ww
re
wW

[ KX-T7533G/KX-T7533G-B |
CIRCUIT OPERATIONS
1. KEY INPUT CONTROL CIRCUIT
1) Circuit Operation
Sequential input information (negative logic) from the DSHS proprietary telephone is executed by dynamic scanning.
The ports RR70 to RR73, RR80 to RR83 of IC8 are brought to low status consecutively.
If a key is pressed, the key-in information input is executed by ports R91 to R93, RB1, RB11, RB21, RBO, RD1.
Circuit Diagram
Pe po ee pas 29 ‘ied ‘enka:
e) oO 00 r-O0 0 OO
a COS CO4 C03 COt RR{70]
pai
cote (ee}h} C010
eS 7
- wo
-
RIS2] AI93] RB[t]
Hee) Ee PAUSE | PROG
‘is pa ae
OOo OO OO
Di7
| O18 | -raer
Hein Pe ade cee Pee
rs
NEXOENENENE)
5
c
ae ah Rs 44h
RD[t]
Key Input Control Timing Chart
"1" button is pressed. |
‘ ‘ When "RR81" is low status
RR70 : 1 + and the "1" button is pressed,
ols i LI L the key-in information is read.
ee ae
RR72
—
LI
;
Lu
:
pk
os
mit ;
(negative
logic)
—~12-

KX-T7533G/KX-T7533G-B
2. LCD CONTROL CIRCUIT
1) Circuit Operation
The LCD data is output from pins 32 to 35, 40 to 47 and 11 of IC6. LCD contrast adjustment is performed by the circuit
composed of Q28, Q29, R109, R108 and R106. The contrast is determined only by the voltage level between V5 and
VEE of 1C202 and 1C201. Higher potential makes the contrast high.
Circuit Diagram
[or
soo Tr

KX-T7533G/KX-T7533G-B
LCD Contrast Control
CONTRAST IC9 Pin 56 ICQ Pin 57
HIGH H L
MIDDLE L H
LOW H H
4-bit Data Transfer Timing Sequence
Data Transfer Timing Sequence
READ CYCLE
RW, CS, RS
DBO-7
WRITE CYCLE
E
RW, CS, RS
DBO-7
he eas

KX-T7533G/KX-T7533G-B
3. LED CIRCUIT
1) Circuit Operation
The LED executes dynamic lighting for the status indicators, and control is executed by the output ports CO to C5
(column) and RO to R9 of 1C1.
A fixed pulse (T=1.82 msec) is output continuously from the/SCK1 terminal of IC9. This pulse is counted and the
output of !C1 is shifted sequentially from CO to C5.
RO to R7 of IC1 also output pulses, and the lighting of the LED is controlled by the timing of the output ports CO to C5.
1C1
Circuit Diagram ® Waveform
CoO1
C2 3
OU V
Cl "OO V A
Ch3 S.00V soomv
+5V(V1)
4
R26 | C16
[—> Kx-T7548CE
D201
—~15—-

KX-T7533G/KX-T7533G-B
4. DATA COMMUNICATION CIRCUIT
1) Function
The data communication circuit serves the following functions:
Information exchanger between the DSHS and DSHS proprietary telephone, key input information as well as data for
the LED control, LCD control, etc. This information is continuously exchanged at all times.
2) Circuit Operation
When the DSHS proprietary telephone receives an IRQ signal from the DSHS and after sending the key input
information to the DSHS and receiving data for the LED control, etc., the DSHS proprietary telephone will return to the
DSHS an acknowledge signal.
3) Reception
The data from the DSHS is received via the H and L lines along the path shown below.
H, L Line + T1 > 1C11 Pin 5, 10 > IC1 Pin 38, 39 > IC1 Pin 21 > IC2 Pin 22
4) Transmission
The data to the DSHS proprietary telephone is transmitted along the following path.
IC2 Pin 23 > IC1 Pin 20 > IC1 Pin 40, 41 — Q1, Q2 5 T1 5H, L Line
Circuit Diagram
IC2
COMMUNICATION LS!
TO HANDSET
SP-PHONE
XDP PORT
RXA
Reception
—~16-

KX-1T7533G/KX-T7533G-B
Timing Chart for D-PITS Transmission
4
hit Hh ec HEA Hh ‘on
fe i
Between Hand L
JK1(H-L)
DRX-A H
IC1
DRX-B
C1 69 fil
DTX-A
ae HHL
DTX-B
1C1 4D
Parity Parity
From Format Deh] Bich Bech || [svnc|mam[Dch] Bt ch B2 ch
va | -| [+ es
Data receive from PBX Data transmission to PBX
<
125us / frame
5) IC1 (GATE ARRAY) DPITS Interface
DPITS Layer 1 interface. DR [1:0] is receiving input and DX [1:0] is transmitting output.
Layer 1 is the transmission method of Ping-Pong type which is AMI encoded. "SYNC/MAMC/D/B1/B2/P" data is
received in the first half at 125us/frame. After 1 bit time has passed since receiving P data, "SYNC/MAM/C/D/B1/B2/P"
is transmitted. 1 bit time is 512kHz. 7-bit time idle term comes after receiving P data.
Dpits Frame Timing
Parity Bit
125us. ——___________-
frame | sync |mamlcl 0 | BI | B2 IP] | sync [mamiclo|] — Bt | B2P| |
DRO Sater EPL Pere ee
DRI = a [inn
DXO = TSE
DXx1 - :
<«— Idle —+:
Transmit
~_-—_—_————- Receive
ee sd ee switching term (1 bit time)
217 =

KX-T7533G/KX-T7533G-B
6) PCM interface (between IC1 and IC2)
PCM interface consists of following 4 terminals.
PCM interface terminal
—FSYNC | 8kHz sync. signal input terminal BCLK PCM data shift clock input terminal
TXD data output terminal PCM data input terminai
The first PCM data is output from TXD at the positive edge of -FSYNC. The second data and the followings are output
at the positive edge of BCLK. After all data of 8 bit are output, the last data is kept until the positive edge of next -
FSYNC. The positive edge of BCLK should be within +100ns from the positive edge of -FSYNC.
The PCM data input from RXD is sampled at the negative edge of BCLK inside LS!. The sampling of the first data is
performed between the positive edge of -FSYNC and the first negative edge of BCLK. After completing the sampling of
all data of 8 bit, this sampling pauses until the next positive edge of -FSYNC.
Pulse Timing
-FSYNC (Sync. Signal)
BCLK (Data shift clock pulse)
the second data
the second data
the first data
the first data
TXD (Data output)
RXD (Data input)
(~100nsS@S +100ns)
=19.5

5. RESET CIRCUIT
1) Circuit Operation
This
circuit
is
used
for
transmission
of
a
reset
pulse
to
the
CPU
(IC6)
at
the
following
times,
connecting
the
telephone
line jack and circuit operation.
The timing chart is shown below.
Circuit Diagram
Power ON
Q25 OFF
The reset signal goes up with the power voltage.
D1i1 Zener Diode ON
Charging C63 is started.
The base voltage of Q25 goes up.
Q25 ON
The reset signal is negledted.
Reset signal is asserted
Timing Chart
+5V (V1) —~ fy
Qa5 oa aie a
Reset signal IC1 Pin im
IC6
Pin
(5)
+41
eee)
x
a
IC6 Pin (14) or 20
2.00V ch4 2oomv
i
Fata Seed eee ~ amen Roce Arnie ba tetvepete qm geecercm ee
2.92V
|
The first reset
is asserted.
~19-
|
The reset signal
is neglected.

KX-T7533G/KX-T7533G-B
6. TONE GENERATION CIRCUIT
1) Function
Cailing tones, Busy tone, DTMF signal and Key in tone are generated in IC2.
PCM
IN
PCM
OUT
Decoder
Coder
Output
Port
Register
IC2 Block Diagram
Speech
3 Network
Output Port
MPU Interface
Speaker
DTMF Frequency Table
High Group
(IC9 Pin 77)
1209 Hz | 1336 Hz | 1477 Hz
1 3
2
90