Panasonic KX-T7730X User manual

ORDERNO. KMS0110592C3
PROPRIETARYTELEPHONE
KX-T7730X
(forAsia, MiddleNearEast, Africa and LatinAmerica)
SPECIFICATIONS
1. INTRODUCTION
1.1. NOTE
Whenyou notetheserial number, writedownall ofthe11 digits.
1

Theserial numbermay befound on thelabel affixedtothebottom oftheunit.
1.2. FORSERVICETECHNICIANS
ICsand LSIsarevulnerabletostaticelectricity.
Whenrepairing, thefollowing precautionswill helppreventrecurring malfunctions.
1. Covertheplasticparts boxes withaluminumfoil.
2. Ground thesoldering irons.
3. Use aconductivemat on theworktable.
4. DonottouchICorLSI pinswithbarefingers.
2. LOCATIONOFCONTROLS
2

3

3. CONNECTION
Caution:
Ensurethecordisinsertedinthegroovetopreventdamagetothe
connector.
4. DISASSEMBLYINSTRUCTIONS
4

1. Remove theStand.
2. Remove 4Screws(A).
3. Remove theBottom Cabinet.
4. Remove theConnector (1~3)and theFlatCable
from theMainBoard.
5

5. Remove 2Screws(A).
6. Remove theMainBoard from theTop Cabinet.
7. Remove theCablefrom theMainBoard.
8. Remove theLCD Holderbysliding theHookinthe
direction ofthearrowfrom theMainBoard.
5. ICDATA
6

PinNo. Terminal
Name I/OFunction I/OSetting Description
1RE0 I I LCD linageH:3lineModel L:Other
2TEST I - Vcc Connection
3OSC1 I - 4MHz
4OSC2 O - 4MHz
5RESET I -
6X1 I - NotusedVcc Connection
7X2 O - Open
8GND - -
9D0 I/O OHS SMmute
10 D1 I/O OHFMM mute
11 D2 I/O O(I) HFSMmute(Thisisalsomodel code.)
12 D3 I/O OHFRelay
13 D4 I/O OHS poweron
14 D5 I/O OHFpoweron (CS)
15 D9 I/O IHOLDKey L:Key press
16 D10 I/O ODO
17 D11 I/O ODCLR
18 D12 I I DI
19 D13 I I DI_INT
20 R00 I/O IKEY-IN0
21 R01 I/O IKEY-IN1
22 R02 I/O IKEY-IN2
23 R03 I/O IKEY-IN3
24 R10 I/O IKEY-IN4
25 R11 I/O IKEY-IN5
26 R12 I/O IKEY-IN6
27 R13 I/O IHook-SW
28 R20 I/O OKEY/LED-COM0
29 R21 I/O OKEY/LED-COM1
30 R22 I/O OKEY/LED-COM2
31 R23 I/O OKEY/LED-COM3
32 R30 I/O I/O KEY-COM4
33 R33 I/O O(I) LCD_Contrast1(Thisisalsomodel
code.)
34 R32 I/O O *LCD_Contrast0
35 R31 I/O I/O KEY-COM5
36 R40 I/O IRing vol off
37 R41 I/O O LCD_CLK
38 R42 I/O O(I) LCD_STB/(Model Code)
39 R43 I/O O LCD_DO
40 R60 I/O O LED0
41
R61
I
/
O
O
LED1
7

41
R61
I
/
O
O
LED1
PinNo. Terminal
Name I/OFunction I/OSetting Description
42 R62 I/O O LED2
43 R63 I/O O LED3
44 R70 I/O O LED4
45 R71 I/O O LED5
46 R72 I/O O LED6
47 R73 I/O O LED7
48 R80 I/O OHFSP vol 1
49 R81 I/O OHFSP vol 2
50 R82 I/O OHFSP vol 3
51 R83 I/O OHFSP vol 4
52 R90 I/O OTonecont1
53 R91 I/O OTonecont2
54 R92 I/O OTonecont3
55 R93 I/O OTonecont4
56 RA0 I/O OHS SP vol 1
57 RA1 I/O OHS SP vol 2
58 SEL I I AFour-minuteCycleVcc Connection
59 VCC - -
60 TONC O O DTMFColumn
61 TONR O O DTMFRow
62 VTref - - DTMFStandard Power
63 RD0 I I HeadSetDetention
64 RD1 I I TONE-DET
6. BLOCK DIAGRAM
7. CIRCUITOPERATIONS
7.1. KEYINPUTCONTROLCIRCUIT
Sequential inputinformation isexecutedbydynamicscanning.
TheportsR20~R23, R30, R31 ofIC1arebroughttohigh statusconsecutively.
Ifakey ispressed, thekey-ininformation inputisexecutedbyportsR00~R03, R10~R13.
8

7.2. LEDCIRCUIT
CircuitOperation:
TheLEDexecutes dynamiclighting for thestatusindicators, and control isexecutedbythe
outputportsR20~R23, R60~R63, R70~R73.
9

7.3. DATACOMMUNICATIONCIRCUIT
Function:
Thedatacommunication circuitserves thefollowing functions:
Information exchangerbetweenthePBX and proprietarytelephone, key inputinformation as well
as datafor theLEDcontrol, LCD control, etc. Thisinformation iscontinuouslyexchangedatall
times.
CircuitOperation:
Whentheproprietarytelephonereceives anIRQsignal from thePBX and aftersending thekey
inputinformation (19 pulses)tothePBX and receiving data(47 pulses)for theLEDcontrol, etc.,
theproprietarytelephonewill return tothePBX anacknowledgesignal.
1)Reception
Thedatafrom thePBX isreceivedviatheHand Llines along thepathshownbelow.
H, LLineD2T2R106 Q102 IC2IC1Pin18
2)Transmission
Thedatatotheproprietarytelephoneistransmittedalong thefollowing path.
IC1Pin16 IC2Q101 T2D2H, LLine
10