Panasonic KX-T7565AL User manual

©2000 Kyushu Matsushita Electric Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
KX-T7565AL
KX-T7565AL-B
White Version
Black Version
(for Australia)
DIGITAL PROPRIETARY TELEPHONE
ORDER NO. KMS0011532C3

1 CAUTION 2
2 FOR SERVICE TECHNICIANS 2
3 LOCATION OF CONTROLS 3
4 DISASSEMBLY INSTRUCTION 4
4.1. HOW TO REMOVE THE LOWER CABINET(Procedure 1)
4
4.2. HOW TO REMOVE THE HOOK BUTTON(Procedure 1ｮ2)
4
4.3. HOW TO REMOVE THE MAIN BOARDS(Procedure 1ｮ2ｮ
3) 5
4.4. HOW TO REMOVE THE LCD BLOCK(Procedure 1ｮ2ｮ3ｮ
4) 5
5 IC DATA 6
5.1. IC1 6
5.2. IC2 8
6 HOW TO REPLACE THE FLAT PACKAGE IC 10
6.1. PREPARATION 10
6.2. FLAT PACKAGE IC REMOVE PROCEDURE 10
6.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 11
6.4. BRIDGE MODIFICATION PROCEDURE 11
7 BLOCK DIAGRAM 12
8 CIRCUIT OPERATIONS 13
8.1. KEY INPUT CONTROL CIRCUIT 13
8.2. LCD CONTROL CIRCUIT 14
8.3. LED CIRCUIT 15
8.4. DATA COMMUNICATION CIRCUIT 16
8.5. RESET CIRCUIT 17
8.6. TONE GENERATION CIRCUIT 18
8.7. HANDSET CIRCUIT 20
8.8. SPEAKER-PHONE CIRCUIT 20
9 TROUBLE SHOOTING GUIDE 22
9.1. NO OPERATION 22
9.2. THE ELECTRONIC VOLUME OF THE SPEAKER-PHONE
DOES NOT WORK 23
9.3. THE ELECTRONIC VOLUME OF THE HANDSET DOES
NOT WORK 23
9.4. SPEAKER-PHONE TROUBLE 24
9.5. TONE DIAL TROUBLE 24
9.6. HANDSET TROUBLE 25
10 WAVEFORM 26
11 TERMINAL GUIDE OF IC 担, TRANSISTORS AND DIODES 28
12 CABINET AND ELECTRICAL PARTS LOCATION 29
13 ACCESSORIES AND PACKING MATERIALS 30
14 REPLACEMENT PARTS LIST 31
14.1. CABINET AND ELECTRICAL PARTS 31
14.2. ACCESSORIES AND PACKING MATERIALS 31
14.3. MAIN BOARD PARTS 31
15 SCHMATIC DIAGRAM 35
16 PRINTED CIRCUIT BOARD (MAIN BOARD) 37
16.1. COMPONNENT VIEW 37
16.2. BOTTOM VIEW 38
CONTENTS
Page Page
1 CAUTION
Note:
When you mention the serial number, write down all 11 digits.
The serial number may be found the label affixed to the bottom of the unit.
2 FOR SERVICE TECHNICIANS
1.Note the following items when exchanging the LEDs (Ref. No. D100-107) of Main 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.
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KX-T7565AL / KX-T7565AL-B

3 LOCATION OF CONTROLS
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KX-T7565AL / KX-T7565AL-B

4 DISASSEMBLY INSTRUCTION
4.1. HOW TO REMOVE THE LOWER CABINET
(Procedure 1)
(1) Remove the 5 screws A.
(2) Remove the lower cabinet.
4.2. HOW TO REMOVE THE HOOK BUTTON
(Procedure 1→
→→
→2)
(1) Remove the hook button.
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KX-T7565AL / KX-T7565AL-B

4.3. HOW TO REMOVE THE MAIN BOARDS
(Procedure 1→
→→
→2→
→→
→3)
(1) Remove the 6 screws A.
(2) Remove the main board, speaker, H/S jack and mic.
4.4. HOW TO REMOVE THE LCD BLOCK
(Procedure 1→
→→
→2→
→→
→3→
→→
→4)
(1) Pull out the flat cable. (See Fig. 1)
(2) Remove the LCD block. (See Fig.2)
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KX-T7565AL / KX-T7565AL-B

5 IC DATA
5.1. IC1
Name Pin Dir. Pull Up Type Io Act. Block MHz Descriptions
DB3 2bidir --- TTL 8.0mA high PT5B03 2Data Bus [3]
DB2 3bidir --- TTL 8.0mA high PT5B03 2Data Bus [2]
DB1 4bidir --- TTL 8.0mA high PT5B03 2Data Bus [1]
DB0 5bidir --- TTL 8.0mA high PT5B03 2Data Bus [0]
ADR1 6input 12-38k TTL --- high PT5D01U 2Address Bus [1]
ADR0 7input 12-38k TTL --- high PT5D01U 2Address Bus [0]
CSN 8input --- TTL --- low PT5D01 1Chip Select
REN 10 input 12-38k TTL --- low PT5D01U 2Read Enable Command
WEN 9input 12-38k TTL --- low PT5D01U 2Write Enable Command
RST 63 input --- CMOS schmidt --- high PC5D21 0.01 Asynchronous Reset Input
INT0N 11 output --- CMOS 2.0mA low PC5O01 0.01 Interrupt Request
INT1N 12 output --- CMOS 2.0mA low PC5O01 0.01 Interrupt Request
DR0 38 input --- CMOS --- low PC5D01 0.6 Dpits Receive Data [1]
DR1 39 input --- CMOS --- low PC5D01 0.6 Dpits Receive Data [0]
DX0 40 output --- CMOS 4.0mA low PC5O02 0.6 Dpits Transmit Data [1]
DX1 41 output --- CMOS 4.0mA low PC5O02 0.6 Dpits Transmit Data [0]
CK512K 37 output --- CMOS 2.0mA high PC5O01 0.6 Dpits Bit Rate Clock
SR0 19 input 12-38k TTL --- high PT5D01U 0.1 Serial Receive Data Stream [0]
SR1 20 input 12-38k TTL --- high PT5D01U 0.1 Serial Receive Data Stream [1]
SX 21 output --- CMOS 4.0mA high PC5O02 0.1 Serial Transmit Data Stream
CK2M 18 output --- CMOS 4.0mA high PC5O02 2.1 Serial Stream Clock
EP0 13 output --- CMOS 2.0mA high PC5O01 0.01 not used
EP1 14 output --- CMOS 2.0mA high PC5O01 0.01 not used
EP2 15 output --- CMOS 2.0mA high PC5O01 0.01 External Channel Pulse [2]
EP3 16 output --- CMOS 2.0mA high PC5O01 0.01 not used
PI 61 input --- CMOS schmidt --- high PC5D21 0.01 not used
NI 62 input --- CMOS schmidt --- high PC5D21 0.01 not used
CLM0 43 output --- CMOS 4.0mA high PC5O02 0.01 LED Column Drive [0]
CLM1 44 output --- CMOS 4.0mA high PC5O02 0.01 LED Column Drive [1]
CLM2 45 output --- CMOS 4.0mA high PC5O02 0.01 LED Column Drive [2]
CLM3 46 output --- CMOS 4.0mA high PC5O02 0.01 LED Column Drive [3]
CLM4 47 output --- CMOS 4.0mA high PC5O02 0.01 LED Column Drive [4]
CLM5 48 output --- CMOS 4.0mA high PC5O02 0.01 LED Column Drive [5]
NROW0 50 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [0]
NROW1 51 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [1]
NROW2 52 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [2]
NROW3 53 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [3]
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NROW4 54 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [4]
NROW5 55 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [5]
NROW6 56 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [6]
NROW7 57 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [7]
NROW8 58 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [8]
NROW9 59 output --- CMOS 4.0mA low PC5O02 0.01 LED Row Drive [9]
IP0 27 input 12-38k CMOS --- high PC5D01U 0.01 not used
IP1 28 input 12-38k CMOS --- high PC5D01U 0.01 not used
IP2 29 input 12-38k CMOS --- high PC5D01U 0.01 not used
IP3 30 input 12-38k CMOS --- high PC5D01U 0.01 not used
OP0 23 output --- CMOS 4.0mA high PC5O02 0.01 LCD Vol.control 1
OP1 24 output --- CMOS 4.0mA high PC5O02 0.01 LCD Vol.control 2
OP2 25 output --- CMOS 4.0mA high PC5O02 0.01 not used
OP3 26 output --- CMOS 4.0mA high PC5O02 0.01 not used
CK2K 22 output --- CMOS 4.0mA high PC5O02 0.2 not used
CK16M 36 output --- CMOS 2.0mA high PC5O01 16.4 Master Clock Out
OSI 33 input --- Analog --- --- PC5X02 16.4 X´tal In (XIN)
OSO 34 output --- Analog --- --- PC5X02 16.4 X´tal Out (XOUT)
N.C. 32 --- --- --- --- --- --- --- not used
N.C. 42 --- --- --- --- --- --- --- not used
N.C. 60 --- --- --- --- --- --- --- not used
VDD1 1vdd --- --- --- --- --- --- Vdd (5V)
VDD2 31 vdd --- --- --- --- --- --- Vdd (5V)
VDD3 49 vdd --- --- --- --- --- --- Vdd (5V)
VSS1 17 vss --- --- --- --- --- --- Vss (GND)
VSS2 35 vss --- --- --- --- --- --- Vss (GND)
VSS3 64 vss --- --- --- --- --- --- Vss (GND)
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KX-T7565AL / KX-T7565AL-B

5.2. IC2
Classification Terminal Pin No. Input/Output Function
Power supply Vcc 7 - Power supply terminal
GND 3 - Ground terminal
CVcc 64 -Connect to the Vcc terminal
Vtref 61 -DTMF reference level voltage terminal
Connect to the Vcc terminal
Oscillation X1 1Input Input/Output terminal to the main oscillator.
X2 2Output Connect to the ceramic oscillator.(8MHz)
OSC1 5Input No use
OSC2 4Output No use
Reset RESET 8Input Reset terminal of MCU (Active Low)
Test TEST 6Input No use
I/O port P20 9Output DTMF tone control
P24 13 Output Handset tone control
P25 14 Output SP-Phone tone control
P26 15 Output Ringer tone control
P27 16 Input Hook Switch
SCK1 10 Output LCD serial clock
P22 11 Output LCD write enable command
SO1 12 Output LCD data
P17 17 Input Interrupt request from G/A (IC1)
P16 18 Input Interrupt request from G/A (IC1)
P15 19 Output Reset terminal of G/A (IC1) (Active Hi)
P14 20 Output KEY communication output 1
P13 21 Output KEY communication output 2
P12 22 Output KEY communication output 3
P11 23 Output KEY communication output 4
P10 24 Output KEY communication output 5
P50 28 Input KEY communication input 0
P51 29 Input KEY communication input 1
P52 30 Input KEY communication input 2
P53 31 Input KEY communication input 3
P54 32 Input KEY communication input 4
P55 33 Input KEY communication input 5
P56 34 Input KEY communication (HOLD key)
P57 35 Input No use
PA3 25 Output W.OHCA control
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KX-T7565AL / KX-T7565AL-B

PA2 26 Output Ringer tone vol. Control 1
PA1 27 Output Ringer tone vol. Control 2
P60 36 Output Handset speaker mute control
P61 37 Output Handset mic mute control
P62 38 Output SP-Phone speaker mute control
P63 39 Output Off-hook-monitor control
P64 40 Output Handset power control
P65 41 Output SP-Phone power control
P66 42 Output Side tone control
P67 43 Output Select A-Law/m-Law
P70 44 Output SP-Phone mic mute control
P71 45 Output Handset vol. Control 1
P72 46 Output Handset vol. Control 2
P73 47 Output Handset vol. Control 3
P74 48 Output Read enable terminal of G/A (IC1) (Active Low)
P75 49 Output Write enable terminal of G/A (IC1) (Active Low)
P76 50 Output Address bus 1 for G/A (IC1)
P77 51 Output Address bus 2 for G/A (IC1)
P80 52 Input/Output Data bus 1 for G/A (IC1)
P81 53 Input/Output Data bus 2 for G/A (IC1)
P82 54 Input/Output Data bus 3 for G/A (IC1)
P83 55 Input/Output Data bus 4 for G/A (IC1)
P84 56 Output SP-Phone vol. Control 1
P85 57 Output SP-Phone vol. Control 2
P86 58 Output SP-Phone vol. Control 3
P87 59 Output SP-Phone vol. Control 4
AN7 61 Input Select Model/Area cord
AN6 62 Input Select Ringer position
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6 HOW TO REPLACE THE FLAT PACKAGE IC
If you do not have the special tools (for example: SPOT HEATER) to remove the SPOT HEATER’S Flat IC, If you have solder
(large amount) a soldering iron and a cutter knife, you can easily remove IC’s even though large than 100 pin.
6.1. PREPARATION
· SOLDER
Sparkle Solder 115A-1, 115B-1 or Almit Solder KR-19, KR-19RMA
· Soldering iron
Recommended power consumption is between 30 W to 40 W.
Temperature of Copper Rod 662 ± 50°F (350 ± 10°C)
(An expert may handle a 60~80 W iron, but beginner might damage foil by overheating.)
· Flux
HI115 Specific gravity 0.863
(Original flux should be replaced daily.)
6.2. FLAT PACKAGE IC REMOVE PROCEDURE
1.When all of the IC lead can not been seen at the standard degree, fill with large quantities of solder.
Note:
If you do not fill with solder and directly cut the IC lead with the cutter, stress may build up directly in the P.C.board’s pattern.
If you do not fill with large quantities of solder as in step 1 the P.C.board pattern may be removed.
2.Using a cutter, cut the lead at the source. (Cut the contents with the cutter lightly 5 or 6 times.)
3.Remove when the solder melts. (Remove the lead at the same time.)
After removing the Flat IC and when attaching the new IC, remove any of the excess solder on the land using the soldering wire,
etc. If the excess solder is not removed from the land, the IC will slip and not be attached properly.
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KX-T7565AL / KX-T7565AL-B

6.3. FLAT PACKAGE IC INSTALLATION PROCEDURE
1.Temporary fix FLAT PACKAGE IC by soldering on two marked pins.
*Check the accuracy of the IC setting with the corresponding soldering foil.
2.Apply flux for all pins of FLAT PACKAGE IC.
3.Solder using the specified solder, in the direction of the arrow, by sliding the soldering iron.
6.4. BRIDGE MODIFICATION PROCEDURE
1.Lightly re-solder the bridged portion.
2.Remove the remaining solder along pins using a soldering iron as shown in the figure below.
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KX-T7565AL / KX-T7565AL-B

7 BLOCK DIAGRAM
DATA
COMMUNICATION
IC4,Q1
TEL JACK
Power circuit
LED
D100
D110
LED
DRIVE
Q5 Q9
IC1
GATE
ARRAY
DPT
communic
ation
LED
control
IC3
CODEC
IC7 SP-PHONE CIRCUIT
HANDSET
CIRCUIT
IC2
CPU
RESET
H/S VOLUME
CONTRAST control
LCD
KEY
8MHz
16.384MHz
HANDSET
SPEAKER
SP-PHONE
VOLUME
+5V
+5V
+5V
+5V
+5V
SW1
HOOK SW
+5V
MICROPHONE
Q10
RESET
IC5,Q3,Q4,D2 D1
Power control circuit
Q200,Q201,Q202
T1
RXA,RXB
TXA,TXB
X2
RX
TX
CK2M,SYNC
IC10
R0,R1,R4,R5
C0 C4
D0 D3
A0,A1,IOR,IOW
INTRX,INTTX
OP0,OP1
X1
CLK,DATA,E
+5V
DTMF generator
Q14
Q15
Q20
Q21
IC8
Tone control
IC9
Side tone
control
IC9
Off-hook
monitor
control
SW2
Ringer SW
Q999
Ringer vol.
control
Q18
W.OHCA
control
CN1
JK1
KEY OUT 1 5
KEY IN 0 5
HOLD KEY
1AP:PSUP1315Z
Q12
Q16
KX-T7565AL / KX-T7565AL-B
12

8 CIRCUIT OPERATIONS
8.1. KEY INPUT CONTROL CIRCUIT
(1) CIRCUIT OPERATION
Sequential input information (negative logic) from the DSHS proprietary telephone is executed by dynamic scanning.
The ports P10 to P14 of IC2 are brought to low status consecutively.
If a key is pressed, the key-in information input is executed by portS P50 to P56.
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8.2. LCD CONTROL CIRCUIT
(1) CIRCUIT OPERATION
The LCD data is output from pins 12 of IC2.
LCD contrast adjustment is performed by the circuit composed of Q10, R44, R45, R46 and R47.
The contrast is determined only by the voltage level between pin 4 of CN1 and +5 V. Higher potential makes the contrast high.
LCD Contrast Control
CONTRAST IC1 Pin 23 IC2 Pin 24
HIGH L L
MIDDLE H L
LOW L H
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KX-T7565AL / KX-T7565AL-B

8.3. LED CIRCUIT
(1) CIRCUIT OPERATION
The LED executes dynamic lighting for the status indicators, and control is executed by the output ports C0 to C4 (column) and
R0, R1, R4, R5 (row) of IC1.
A fixed pulse (T=1.5 msec) is output continuously from IC1. This pulse is counted and the output of IC1 is shifted sequentially
from C0 to C4.
R0 to R5 of IC1 also output pulses, and the lighting of the LED is controlled by the timing of the output ports C0 to C4.
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8.4. 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 EMSS is received via the H and L lines along the path shown below.
(4) TRANSMISSION
The data to the EMSS proprietary telephone is transmitted along the following path.
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KX-T7565AL / KX-T7565AL-B

8.5. RESET CIRCUIT
(1) CIRCUIT OPERATION
This circuit is used for transmission of a reset pulse to the CPU (IC2) at the following times, connecting the telephone line jack
and circuit operation.
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8.6. TONE GENERATION CIRCUIT
(1) FUNCTION
All system tones including COL, extension, busy, DTMF signal and key-in tones are sent from Pins 60 of IC2 and controls the
path by the Analog Switch (IC8).
(2) CALLING TONES FROM COL AND EXT.
For a calling tone from a CO line or extension, the single row tone signal is output from Pin 60 of IC2 and the tone volume is
controlled by transistors Q999.
Ringer Volume Control
Level OFF LOW HIGH
Q999 OFF ON* OFF
*CAUTION:
It is ON with ringer sound and it is OFF with no ringer sound regardless of the ringer volume.
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KX-T7565AL / KX-T7565AL-B

(3) BUSY STATION CALLING TONE
852 Hz and 697 Hz signals are output from Pin 61 of IC7 alternately at intervals of 60 ms.
The signal flow is shown below.
(4) DTMF SIGNAL
A DTMF tone is generated by IC7 and the signal flow is shown below.
High Group
1209 Hz 1336Hz 1477Hz
697 Hz 1 2 3
Low 770 Hz 4 5 6
Group 852 Hz 7 8 9
941 Hz * 0 #
(5) KEY-IN TONE
An 852 Hz single tone is used as the key-in tone. A tone is generated from IC7 and is heard at the speaker.
The signal flow is shown below.
CONDITION IC8 SWA IC8 SWB IC8 SWC IC8 SWD
Ringing OFF OFF OFF ON
Call Waiting OFF OFF ON OFF
Tone Dial (Handset) ON ON OFF OFF
Tone Dial (Speakerphone) ON OFF ON OFF
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KX-T7565AL / KX-T7565AL-B

8.7. HANDSET CIRCUIT
(1) TRANSMISSION SIGNAL PATH
The analog input signal for the handset microphone is changed to a digital signal and sent through the telephone line via the
following path:
(2) RECEPTION SIGNAL PATH
The digital input signal from the telephone line is changed to an analog signal by IC3 and sent to the receiver via the following
path:
(3) CIRCUIT DIAGRAM FOR TRANSMISSION / RECEPTION SIGNAL PATH.
8.8. SPEAKER-PHONE CIRCUIT
(1) FUNCTION
This 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.
(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.
This switching circuit is contained in IC8 and consists of a Voice Detector, Tx Attenuator, Rx Attenuator, Comparator and
Attenuator Control. The circuit analyzes whether the Tx (transmit) or Rx (receive) signal is louder, and then it processes the
signals so 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 Rx signal, and supplies DC input to the Attenuator Control corresponding to the Rx signal. The Attenuator Control
provides a control signal to the Tx and Rx Attenuator to switch the appropriate signals ON and OFF. The Attenuator Control also
detects the level of the volume control to automatically adjust the volume for changing ambient conditions.
(3) CONTROL SIGNAL PATH
Control signals for transmission and reception are input to IC8 via the following path:
(Transmission Control Signal Path)
(Reception Control Signal Path)
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KX-T7565AL / KX-T7565AL-B