Panasonic KX-T7565AL Service Manual Download Page 14 | Manualshive

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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

14

KX-T7565AL / KX-T7565AL-B

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Summary of Contents for KX-T7565AL

Page 1: ...shita 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 ...

Page 2: ...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 ...

Page 3: ...3 LOCATION OF CONTROLS 3 KX T7565AL KX T7565AL B ...

Page 4: ...LY 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 4 KX T7565AL KX T7565AL B ...

Page 5: ... 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 5 KX T7565AL KX T7565AL B ...

Page 6: ... 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 PC5O...

Page 7: ...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 Cl...

Page 8: ...trol 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 K...

Page 9: ...t 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 Out...

Page 10: ...ced 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 c...

Page 11: ...esponding 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 11 KX T7565AL KX T7565AL B ...

Page 12: ...NE 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 ...

Page 13: ...ial 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 13 KX T7565AL KX T7565AL B ...

Page 14: ...djustment 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 14 KX T7565AL KX T7565AL B ...

Page 15: ... 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 15 KX T7565AL KX T7565AL B ...

Page 16: ...l 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 ...

Page 17: ...SET 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 17 KX T7565AL KX T7565AL B ...

Page 18: ...tch 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 18 KX T7565AL KX T7565AL B ...

Page 19: ... 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...

Page 20: ...nal 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 Co...

Page 21: ...ONTROL The attenuator control detects the setting of the volume control through Pin 24 of IC8 and automatically adjusts the volume for changing ambient conditions 7 TRANSMISSION SIGNAL PATH The input signal from the microphone is sent through the circuit via the following path 8 RECEPTION SIGNAL PATH Signals received from the telephone line are output to the speaker via the following path 9 OFF HO...

Page 22: ...9 TROUBLE SHOOTING GUIDE 9 1 NO OPERATION 22 KX T7565AL KX T7565AL B ...

Page 23: ...9 2 THE ELECTRONIC VOLUME OF THE SPEAKER PHONE DOES NOT WORK 9 3 THE ELECTRONIC VOLUME OF THE HANDSET DOES NOT WORK 23 KX T7565AL KX T7565AL B ...

Page 24: ...9 4 SPEAKER PHONE TROUBLE 9 5 TONE DIAL TROUBLE 24 KX T7565AL KX T7565AL B ...

Page 25: ...9 6 HANDSET TROUBLE 25 KX T7565AL KX T7565AL B ...

Page 26: ... WAVEFORM TX DATA TRANSFER 1 LED CONTROL DATA 5 RX DATA TRANSFER 2 RX VOICE SERIAL DATA VOICE DATA ON 6 H L DATA 3 TX VOICE SERIAL DATA VOICE DATA ON 7 LED COTROL DATA 4 CK2M 8 26 KX T7565AL KX T7565AL B ...

Page 27: ...EP2 9 KEY INPUT KEY ON 13 INT RX INT TX 10 KEY SIGNAL 14 A0 A1 IOR IOW 11 16 384MHz 15 D0 D1 D2 D3 12 8MHz 16 27 KX T7565AL KX T7565AL B ...

Page 28: ...11 TERMINAL GUIDE OF IC S TRANSISTORS AND DIODES 28 KX T7565AL KX T7565AL B ...

Page 29: ...12 CABINET AND ELECTRICAL PARTS LOCATION 29 KX T7565AL KX T7565AL B ...

Page 30: ...13 ACCESSORIES AND PACKING MATERIALS 30 KX T7565AL KX T7565AL B ...

Page 31: ...UBBER PARTS FOOT 9 PSGP1067Z1 PANEL LCD WHITE VERSION S 9 PSGP1067Z2 PANEL LCD BLACK VERSION S 10 PSGT2102Z NAME PLATE WHITE VERSION 10 PSGT2103Z NAME PLATE BLACK VERSION 11 PQAS57P03Z SPEAKER 12 PQJM122Z MICROPHONE 13 PQMG10022Z RUBBER PARTS MIC 14 2 ACCESSORIES AND PACKING MATERIALS Ref No Part No Part Name Description Remarks A1 PQJXF0202Z HANDSET WHITE VERSION A1 PQJXF0201Z HANDSET BLACK VERSI...

Page 32: ...33 R30 ERJ3GEYJ330 33 R31 ERJ3GEYJ330 33 R32 ERJ3GEYJ330 33 Ref No Part No Part Name Description Remarks R33 ERJ3GEYJ330 33 R39 ERJ3GEYJ103 10K R40 ERJ3GEYJ273 27K R41 ERJ3GEYJ473 47K R42 ERJ3GEYJ103 10K R43 ERJ3GEYJ104 100K R44 ERJ3GEYJ222 2 2K R45 ERJ3GEYJ561 560 R46 ERJ3GEYJ222 2 2K R47 ERJ3GEYJ103 10K R50 ERJ3GEYJ332 3 3K R51 PQ4R10XJ122 1 2K S R52 ERJ3GEYJ221 220 R53 PQ4R18XJ472 4 7K S R54 ER...

Page 33: ...ECST0JY106 10 C106 ECST0JY106 10 C107 PSCEV0JA101 100P C108 PQCUV1H102J 0 001 S C109 ECUV1C104KBV 0 1 C110 ECST0JY106 10 C111 ECUV1C104KBV 0 1 C112 ECUV1C333KDV 0 033 S C113 ECUV1H222KBV 0 0022 C114 ECUV1H153KBV 0 015 C115 ECUV1C473KBV 0 047 C116 ECUV1C104KBV 0 1 C118 ECUV1C683KBV 0 068 C119 ECUV1H223KBV 0 022 S C120 ECUV1H223KBV 0 022 S C121 ECUV1C104KBV 0 1 C122 ECUV1C683KBV 0 068 C123 PQCUV1A47...

Page 34: ...34 KX T7565AL KX T7565AL B ...

Page 35: ... 3 2 5 4 Vo 5 Vdd NC C35 DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG DG R108 100 5VD 5VD 5VD 5VD 5VD 5VD 5VD 5VD 5VA 5VD 5VD 5VD 5VD 5VD 5VA 5VA 5VA 5VA G1 G2 AG AG AG AG AG AG AG AG AG AG AG AG AG AG AG SW40 HOLD NC C4 NC C7 NC C145 NC C146 AG AG C127 4 7 C123 4 7 C130 4 7 AG IC9 8 9 6 IC9 10 11 12 R131 100K AG R162 150K C147 1000p C139 1000P Q1 1 4 3 2 5 5VD R60 1M...

Page 36: ...KX T7565AL KX T7565AL B 36 ...

Page 37: ...W24 D110 D109 D104 D105 D106 D107 D100 D101 D102 D103 PROGRAM TRANSFER 3 2 1 6 5 4 9 8 7 SW36 SW39 SW38 SW37 D108 SW35 STORE INTERCOM SW34 FLASH SW31 SW18 SW20 SW21 SW16 SW17 SW19 SW13 SW15 SW14 SP PHONE MUTE 0 SW12 SW23 SW10 HOLD REDIAL SW40 SW11 SW22 R47 R44 C37 R41 R40 KX T7565AL KX T7565AL B 37 ...

Page 38: ...995 R60 C31 C300 R39 C21 Q6 C127 C119 R130 R997 C125 IC6 1 8 5 4 C142 C143 C134 R140 C135 C137 C136 R141 R138 C131 R142 C138 R143 C132 C130 C148 R100 R157 R107 C112 R116 C151 R156 R151 C144 R300 R124 R150 C105 20 11 1 10 R148 R102 C102 C987 R105 R999 C28 C27 R25 R27 C29 R26 Q10 R45 R46 C990 C103 IC3 R101 C102 R149 C100 C101 C26 R24 R29 R28 C988 R136 C141 R123 R103 R104 C104 C999 C30 R998 SP SP R99...

Page 39: ...39 KX T7565AL KX T7565AL B H KXT7565ALL4 KXT7565ALBL4 Printed in Japan ...

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