Panasonic KX-T2373MXW Service Manual Download Page 1

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KX-T2373MXW

Integrated Telephone System

White Version

(for Asia, Middle Near East and other areas)

Telephone Equipment

ORDER NO. KM40108848C3

Summary of Contents for KX-T2373MXW

Page 1: ...tric Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law KX T2373MXW Integrated Telephone System White Version for Asia Middle Near East and other areas Telephone Equipment ORDER NO KM40108848C3 ...

Page 2: ... Speakerphone IC Data 14 8 TERMINAL GUIDE OF IC STRANSISTORS AND DIODES 15 9 BLOCK DIAGRAM 16 10 BLOCK DIAGRAM IC 1 17 10 1 Communication ICs 17 11 CIRCUIT OPERATION 18 11 1 Bell Detector Circuit 18 11 2 Line Interface 18 11 3 MODULE BLOCK DIAGRAM 19 12 TROUBLE SHOOTING GUIDE 23 12 1 Service Hints 23 12 2 Pulse Dialing Problems 23 12 3 Tone Dialing Problems Hnadset 24 12 4 No Ringing Sound When Ri...

Page 3: ...1 LOCATION OF CONTROLS 3 KX T2373MXW ...

Page 4: ... device computer modem fax answering machine etc to the telephone line you can connect it through this unit using the DATA jack After connecting the handset and telephone line cord connect the communication device telephone line cord to the DATA jack Make sure the communication device is not in use before using this unit making calls storing phone numbers in memory etc or the communication device ...

Page 5: ...ch tone service set to Tone If rotary or pulse service is used set to Pulse Your phone comes from the factory set to Tone Make sure that a call is not put on hold 3 2 Selecting the Ringer Volume You can select the ringer volume to HIGH LOW or OFF Your phone comes from the factory set to HIGH 5 KX T2373MXW ...

Page 6: ...h Time The flash time depends on your telephone exchange or host PBX You can select the following flash times 80 90 100 110 200 250 300 400 600 700 ms milliseconds Your phone comes from the factory set to 600 ms Make sure that a call is not put on hold If you are connected via a PBX a longer flash time may be necessary to use PBX functions transferring a call etc Consult your PBX installer for the...

Page 7: ...s from using your unit The Pin Code is required for the dial lock and call restriction to be set or canceled The factory preset Pin code is 1111 Make sure that a call is not put on hold Please write down your Pin code If you forget your Pin code consult your nearest Panasonic service center 7 KX T2373MXW ...

Page 8: ...Even if the dialing buttons are locked the number stored in the button can be dialed If you choose not to program emergency numbers but plan to use the dial lock any number programmed into the EMERGENCY button can be accessed 4 4 1 To Set the Dial Lock You can use the following features while the dialing buttons are locked Dialing a number you programmed into the memory of the EMERGENCY button Adj...

Page 9: ...led out 4 5 1 To Set the Call Restriction Make sure that a call is not put on hold If your unit is connected to a PBX this function may not operate Contact your PBX supplier for more information 4 6 To cancel the call restriction Follow steps 1 through 5 In step 6 press to cancel call restriction and press A long beep will sound and the unit will return to the standby mode 9 KX T2373MXW ...

Page 10: ...4 7 How to Release the Establishment of Dial Lock After this procedure you will be able to establish a new password How to release the establishment of dial lock 10 KX T2373MXW ...

Page 11: ...5 DISASSEMBLY INSTRUCTIONS Ref No Procedure Shown in Fig To remove Remove 1 1 1 Lower Cabinet Screws 2 6 12 A 5 2 1 2 2 Printed Circuit Board Remove the P C Board 11 KX T2373MXW ...

Page 12: ...Specific gravity 0 863 Original flux will be replaced daily 6 2 Procedure 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 6 3 Modification Procedure of Bridge 1 Re s...

Page 13: ...7 CPU DATA 7 1 IC801 13 KX T2373MXW ...

Page 14: ... V Input dc supply voltage V can be powered from Tip and Ring if an ac decoupling inductor is used to prevent loading ac line signals The required V voltage is 6 0 to 11 V 7 5 V nominal at 7 0 mA 17 AGC A capacitor from this pin to VB stabilizes the speaker amp gain control loop and additionally controls the attack and decay time of this circuit The gain control loop limits the speaker amp input t...

Page 15: ...8 TERMINAL GUIDE OF IC S TRANSISTORS AND DIODES 15 KX T2373MXW ...

Page 16: ...9 BLOCK DIAGRAM KX T2373MXW 16 ...

Page 17: ...10 BLOCK DIAGRAM IC 1 10 1 Communication ICs 17 KX T2373MXW ...

Page 18: ... Speaker 11 2 Line Interface In talk status L1 RLY output from pin 25 of IC801 changes to low level causing Q103 Q101 to turn on and resulting in a line loop The loop current flows from D101 Q101 Q108 R124 D106 in that order A pulse signal that repeated switches between high and low logic is output from pin 26 of the CPU This switches the line loop on and off generating the dial pulse signal 18 KX...

Page 19: ...g to the RX signal 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 IC6...

Page 20: ... turns on thus providing an off hook condition active DC current flow through the circuit and the following signal flow id for the DC loop current T POS101 D101 Q101 Q108 R124 D106 D101 R The receiving signal flows TEL line POS101 Q101 C113 R125 C108 Q109 Q405 Q406 Speaker The transmission signal flows Mic Q421 Q424 C435 R437 Q108 POS101 Tel Line 20 KX T2373MXW ...

Page 21: ...sy tone or dial tone during Auto Redial 11 3 3 1 Circuit operation D101 Q101 C201 R201 R205 Pin 5 of IC201 Pin 1 of IC201 D202 R208 Q201 When the subscriber hangs up check the intermittent tone If cycle tone is detected the collector of Q201 goes to a low logic 21 KX T2373MXW ...

Page 22: ...ialize the microcomputer when it incorporates batteries 11 3 4 2 Circuit operation When the batteries is inserted into the unit then the voltage is shifted by D304 and power is supplied to the CPU The set can operate beyond point A in the circuit voltage diagram 22 KX T2373MXW ...

Page 23: ... Q101 Q103 Q104 Can t auto redial Check IC201 Q201 No rings Check D1 IC1 and Q1 can t speak with the speakerphone Check IC601 Can t hold Check Q107 Can t speak with the handset Check handset jack Can t speak with the headset Check headset jack Can t change the volume for speakerphone Check IC801 IC601 Can t change the volume for handset Check IC801 Q405 No volume handset or speakerphone Check IC80...

Page 24: ...12 3 Tone Dialing Problems Hnadset 12 4 No Ringing Sound When Ring Signal is Input 24 KX T2373MXW ...

Page 25: ...13 CABINET AND ELECTRICAL PARTS LOCATION 25 KX T2373MXW ...

Page 26: ...14 ACCESSORY AND PACKING MATERIALS 26 KX T2373MXW ...

Page 27: ...BATTERY TERMINAL 15 PQJC314Z BATTERY TERMINAL 16 PQQT22058Z INDICATION LABEL 17 PQSX10186Z KEYBOARD SWITCH 18 PQSX10187Z KEYBOARD SWITCH 15 1 2 MAIN P C BOARD PARTS Ref No Part No Part Name Description Remarks PCB1 PQWPT2373MXW MAIN P C BOARD ASS Y RTL ICS IC1 PQVIBA8206F IC S IC201 PQVINJM2904F IC S IC303 PQVIPS3327UT IC IC304 PQVIXCF3702P IC IC601 PQVISC77655S IC S IC801 C2CBFE000007 IC IC903 PQ...

Page 28: ... ERJ3GEYJ681 680 R409 ERJ3GEYJ223 22k R410 ERJ3GEYJ474 470k R411 ERJ3GEYJ681 680 R412 ERJ3GEYJ682 6 8k Ref No Part No Part Name Description Remarks R421 ERJ3GEYJ182 1 8k R422 ERJ3GEYJ153 15k R423 ERJ3GEY0R00 0 R424 ERJ3GEYJ334 330k R425 ERJ3GEYJ225 2 2M R426 ERJ3GEYJ272 2 7k R427 ERJ3GEYJ121 120 R428 ERJ3GEYJ562 5 6k R429 ERJ3GEY0R00 0 R430 ERJ3GEYJ473 47k R432 ERJ3GEYJ223 22k R434 ERJ3GEYJ155 1 5...

Page 29: ...C606 ECUV1C683KBV 0 068 C607 ECUV1C273KBV 0 027 C608 ECUV1C153KBV 0 015 C609 ECUV1C104KBV 0 1 C610 ECEA1HKA010 1 C611 ECEA1HKA010 1 C612 ECEA1VKS4R7 4 7 S C613 ECUV1C683KBV 0 068 C614 ECEA1EU470 47 S C615 ECEA0JU220 22 C616 ECUV1C104KBV 0 1 C617 ECEA1CKS470 47 S C618 ECEA1VU330 33 S C619 ECEA1VKS4R7 4 7 S C620 ECUV1E183KBV 0 018 S C621 ECEA0JKA101 100 C622 ECUV1C104KBV 0 1 C623 ERJ3GEY0R00 0 C624 ...

Page 30: ...A to telephone line from the loop simulator 2 This schematic diagram may be modified at any time with the development of new technology Important Safety Notice Components identified by mark have special characteristics important for safety When replacing any of these components use only the manufacturer s specified parts 30 KX T2373MXW ...

Page 31: ...16 1 MEMO 31 KX T2373MXW ...

Page 32: ...17 SCHEMATIC DIAGRAM DTMF Hold Music Beep 5 8V 3 7V 3 7V 1 4 5 6 7 9 11 13 14 17 21 24 25 26 28 29 10 18 19 20 27 30 31 32 33 IC651 IC601 IC801 IC903 32 KX T2373MXW ...

Page 33: ...Set Headset Set Outgoing Signal The voltage during ON Hook is indicated shows the voltage during OFF Hook KX T2375MXW SCHEMATIC DIAGRAM Battery Low 3 8V 3 9V 5 7V 4 2V 5 8V 4 5V 6 3V 3 7V 3 7V 6 3V 1 4 5 6 7 9 11 13 14 17 21 24 25 26 28 29 10 18 19 20 27 30 31 32 33 IC201 IC1 IC304 IC302 IC303 33 KX T2373MXW ...

Page 34: ...34 KX T2373MXW ...

Page 35: ...37 KX T2373MXW K KXT2375MXW Printed in Japan ...

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