Panasonic KX-T2371MXW User manual

ORDERNO. KM40107835C3
TelephoneEquipment
KX-T2371MXW
IntegratedTelephoneSystem
White Version
(forAsia, MiddleNearEast and Otherareas)
SPECIFICATIONS
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1. LOCATIONOFCONTROLS
2. CONNECTION
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3. OPERATIONS
3.1. Making Calls
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3.2. Answering Calls
4. SPECIALFEATURES
4.1. ForCall Waiting Service Users
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4.2. TemporaryToneDialing (ForRotaryService Users)
4.3. How toUse thePAUSE Button (ForAnalog PBXLine/Long
Distance Service Users)
5. DISASSEMBLYINSTRUCTIONS
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Ref. No. Procedure ShowninFig—. Toremove —. Remove —.
1 1 1 LowerCabinet Screws(2.6×12)............. (A)×5
21~2 2 PrintedCircuitBoard Remove theP.C.Board
6. HOWTO REPLACE FLATPACKAGEIC
6.1. Preparation
-SOLDER
SparkleSolder115A-1, 115B-1 orAlmitSolderKR-19, KR-19RMA
-Soldering iron
Recommendedpowerconsumption will bebetween30 Wto40 W.
TemperatureofCopperRod 662 ±50°F(350 ±10°C)
(Anexpertmayhandlebetween60 Wto80 Wiron, butbeginner
mightdamagefoil byoverheating.)
-Flux
HI115 Specificgravity0.863.
(Original fluxwill bereplaceddaily.)
6.2. Procedure
1. TemporaryfixFLATPACKAGEICbysoldering on twomarked2
pins.
*Mostimportantmatterisaccuratesetting ofICtothecorresponding soldering foil.
2. Applyfluxforall pinsofFLATPACKAGEIC.
3. Solderemploying specifiedsoldertodirection ofarrow, as sliding
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thesoldering iron.
6.3. Modification ProcedureofBridge
1. Re-solderslightlyon bridgedportion.
2. Removeremainedsolderalong pinsemploying soldering iron as
showninbelow figure.
7. CPU DATA
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8. TERMINALGUIDE OFIC’STRANSISTORS AND
DIODES
9. ICBLOCK DIAGRAM
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10. OPTIONJUMPER TABLE
10.1. Dialing ModeSW
IC1
SWPosition
Pin14 LOWTonedialing
Pin14 High Pulse dialing 10 pps
10.2. FlashKey
Flashtime Option
98 ms J1
305 ms J2
600 ms J3 default
11. BLOCK DIAGRAM(IC2)
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12. CIRCUITOPERATIONS
Note:Thecircuitdiagram may bemodifiedatanytimewiththedevelopmentofnewtechnology.
12.1. TelephoneLineInterface and Pulse Dial Circuit
WhenthehookswitchSW1isON(off-hook), thecircuitisclosed, and currentissuppliedtothe
base ofQ2viathediodebridgeD1and Q2isOnQ1isON(OFF-HOOKcondition).
Q1and Q2arethedial pulse generating circuits, and aredrivenbytheDIALER(IC1), whenthe
DIALERPin10 ofIC1isLOWQ2isOFF and Q1isOFF. (break)IfportPin10 isHIGHQ2is
ONQ1isON. (make)
12.2. ToneDial Circuit
Function:
Thetonedialing circuitconsistsofaDTMF(Dual ToneMulti Frequency)signal generator
(outputtedfrom Pin11 oftheIC1)for tonedialing, and alsoacircuitfor outputting thesignal to
line.
TheDTMFcircuitidentifies inputsfrom the12 keys (1,2,3,4,5,6,7,8,9,0, and #)bymeansofa
total ofsevenfrequencies, thatisfour lowfrequencies (Lowgroup)and three high frequencies
(High group).
CircuitDescription:
Whenadial key ispressed, aDTMFsignal isoutputfrom Pin11 ofIC1as ananalog synthetic
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wave.
Thesignal flowtothelineisas follows.
Pin11 ofIC1R37 Q9Q3Q1Tel Line.
TheDTMFsignal issenttothelineviathefollowing path. Q9and Q3isanamplifierwhichisused
tooutputthesignal toline.
Shownbelowisthesignal flowusedtooutputtheDTMFsignal from thehandsetas amonitor
tonewhenadial key ispressed.
Pin11 ofIC1R48 C33 Q7C18 HandsetSpeaker.
Thesignal combination and frequency corresponding toeachdial key isshownon nextpage.
ToneFrequencies
High Group
LowGroup H1 H2 H3
L1 1 2 3
L2 4 5 6
L3 7 8 9
L4 0 #
LowGroup Frequencies High Group
Frequencies
L1 697 Hz±1.5% H1 1209 Hz±
1.5%
L2 770 Hz±1.5% H2 1336 Hz±
1.5%
L3 852 Hz±1.5% H3 1477 Hz±
1.5%
L4 941 Hz±1.5% ----- -----
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12.3. RingerCircuit
CircuitOperation:
Thebell signal passes through C1(R1)supplying powertopin1ofIC2.
Thering signal isoutputfrom Pin5ofIC2, and itsvolumeisadjustedin3steps(H-L-OFF)by
SW3thenimpressedon theceramicsound generator, and soisgenerated.
Outputfrequency iscontrolledbyR2and C3following belowformula.
12.4. PowerCircuitand Redial Back-up Circuit
Function:
Thissetispoweredfrom theline. WhenitisanOFF-HOOKstatus, Tel LineD1Q1R14
pin17 ofIC1(tobecomethepowersupplyfor IC1speechnetwork).
Thevoltagefrom thelineisturnedintoaconstantvoltagebyD6and thensuppliedtotheIC1and
sending and receiving circuitoftheset.
AtON-HOOKstatusthevoltagefrom thelineviaR40, R5isturnedintoaconstantvoltagebyD8,
and thenbecomepowersupplyfor IC1(Pin17), and theredial Back-up will bedone.
12.5. Sending Circuit(Tx)
Whenaperson talkthrough theHandset, thevoice analog signal flowfrom the
micC20 R33 Q9R38 C23 Q3Q1D1Tel line.
*Q9and Q3isanamplifierfor thevoice signal.
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12.6. Receiving Circuit(Rx)
Receiving signal from thelinego through
D1Q1R15 Q4R19 C16 Q6C17 R26 Q7C18 R29 Handset
speaker.
*Q4and Q6isamplifierfor theReceiving signal.
13. TROUBLESHOOTING GUIDE
13.1. Service Hints
SYMPTOM CURE
NoToneDialing. Check IC1, Q3, Q9, R37, R38, R34 and R35.
Dead. Check IC1, Q2and Q1.
Rings, no dial tone, no pulse or tonedial. Check Q1, Q2, D1.
Norings. Check C1, R1, R3and IC2.
Nopulse dial. Check Q1and Q2.
13.2. Pulse Dialing Problems
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13.3. ProblemsWiththeHandset
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13.4. ToneDialing Problems
13.5. ProblemsWithRinger
Check R1, C1, IC2, R3, C37, R2, C3, C2.
13.6. How toCheck theIC1(Scanning tothekey)
14. CABINETAND ELECTRICALPARTSLOCATION
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15. ACCESSORYAND PACKING MATERIALS
16. REPLACEMENTPARTSLIST
ThisreplacementpartslistisKX-T2371MXWonly.
1. RTL (Retention TimeLimited)
Note:
Themarking (RTL)indicates thattheRetention Timeislimitedfor thisitem.
Afterthediscontinuation ofthisassemblyinproduction, theitem will continuetobeavailablefor
aspecificperiod oftime. Theretention period ofavailabilitydependson thetypeofassemblyand
thelawsgoverning partsand productretention. Attheend ofthisperiod, theassemblywill no
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longerbeavailable.
2. Importantsafetynotice
Components identifiedbythemarkindicates special
characteristics importantforsafety. Whenreplacing anyofthese
components, onlyuse specifiedmanufacture'sparts.
3. TheSmarkindicates service standardparts and maydifferfrom
production parts.
4. RESISTORS&CAPACITORS
Unless otherwise specified;
All resistorsareinohms( )K=1000 , M=1000k
All capacitorsareinMICRO FARADS( F)P= F
*Type&WattageofResistor
16.1. Base Unit
16.1.1. CABINETAND ELECTRICALPARTS
Ref. No. PartNo. PartName& Description Remarks
1PQKM10508Z1 UPPER CABINET S
2PQYF10527Z1 LOWER CABINET S
3PQBH10036Z1 HOOK BUTTON S
4PQBX10350Z1 21 KEYBUTTON S
5L0DDFD000002 RINGER
6PQGD10163Z TELCARD
7PQGV10040Z TELCARD COVER
8PQHR10875Z LED LENS
9PQSX10189Z RUBBER SWITCH, 3KEY
10 PQKE10070Z3 H/SHOLDER S
11 PQSX10186X RUBBER SWITCH, 20KEY
16.1.2. MAINP.C.BOARD PARTS
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Ref. No. PartNo. PartName& Description Remarks
PCB1 PQWPT2371MXW MAIN P.C BOARD ASS'Y(RTL)
(ICS)
IC1 C1CA00000250 IC
IC2 PQVILS1240A IC
(TRANSISTORS)
Q1 2SA1625 TRANSISTOR(SI) S
Q2 PQVT2N6517CA TRANSISTOR(SI) S
Q3 2SC2120 TRANSISTOR(SI) S
Q4 2SD1819A TRANSISTOR(SI)
Q5 2SD1819A TRANSISTOR(SI)
Q6 2SD1819A TRANSISTOR(SI)
Q7 2SD1819A TRANSISTOR(SI)
Q8 PQVTFB1A4M TRANSISTOR(SI) S
Q9 2SD1819A TRANSISTOR(SI)
Q10 UN5113 TRANSISTOR(SI) S
Q11 2SD1819A TRANSISTOR(SI)
Q13 2SD1819A TRANSISTOR(SI)
Q18 2SD1819A TRANSISTOR(SI)
Q19 2SD1819A TRANSISTOR(SI)
(DIODES)
D1 PQVDS1YB60F1 DIODE(SI) S
D2 PQVDS5688G DIODE(SI) S
D5 MA4180 DIODE(SI)
D6 MA4039 DIODE(SI)
D7 1SS119 DIODE(SI) S
D8 MA4056 DIODE(SI)
D9 1SS119 DIODE(SI) S
D10 1SS119 DIODE(SI) S
D11 1SS119 DIODE(SI) S
(LED)
LED1 PQVDSML210LT LED
(OTHERS)
X1 PQVBZTA3.58M CRYSTALOSCILLATOR
JJ101 PQJJ1T020Z JACK SOCKET
JJ102 PQJJ1T020Z JACK SOCKET
JJ103 PQJJ1T030Z JACK SOCKET, HANDSET
SA1 PQVDDSS301L SUGAR ABSORBER S
SW1 PQSH2B105Z HOOK SWITCH
SW2 PQSS2A27W SLIDESWITCH
SW3 PQSS3A17W SLIDESWITCH
SW25 PQSS3A17W SLIDESWITCH
(RESISTORS)
R1 ERDS1TJ682 6.8k S
R2 ERJ3GEYJ223 22k
R3 ERJ3GEYJ331 330
R4 ERJ3GEYJ103 10k
R5 ERDS2TJ564 560k
R6 ERDS2TJ683 68k
R7 ERJ3GEYJ104 100k
R8 ERJ3GEYJ104 100k
R9 ERDS2TJ472 4.7k
R10 ERJ3GEYJ102 1k
R11 ERJ3GEYJ153 15k
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