Sharp UX-258TH manual Circuit description of TEL/LIU PWB, TEL/LIU block operational description

Page 50

UX-258TH

FO-475TH

[3] Circuit description of TEL/LIU PWB

(1) TEL/LIU block operational description

1) Block diagram

TEL/LIU PWB				CONTROL PWB

HS

CML

GAIN-C

TXCONT

TEL LINE		H	TXOUT
TEL LINE	HS DETECTOR	L
	HS DETECTOR	L
EXT		CI DETECTOR		0
		CI DETECTOR		0
			RXIN	1
				1
HANDSET				0
			TELIN
			TELOUT
				VOL A
				VOL B
				VOL C
HOOK SW			SP AMP
			SP AMP
			4051
		SPEAKER

TEL MUTE

CI

RHS

+5V

+24

DG

1
0
1	0
BZCONT
0
1

4053

1

0

SIGTX

SIGRX

TXCONT

RXCONT

MONITOR

BZCONT

RCVOL

SP MUTE

TEL MUTE

CI

MODEM

(R96V24)

FC200

GAIN-C

CML

HS

2) Circuit description

The TEL/LIU PWB is composed of the following 7 blocks.

1.Speech circuit section

2.Dial transmission section

3.Speaker amplifier section

4.Ringer circuit section

5.Externally connected TEL OFF HOOK detection circuit

6.CI detection circuit

7.Signal/DTMF transmission level & receiving level

Fig. 5

3) Block description

1.Speech circuit section

•The receiver volume is an electronic volume type, this model is switch in 2 steps.

2.Dial transmission section

•D.P. transmission: The CML relay is turned on and off for control in the DP calling system. (Refer to the attached sheet.)

•DTM transmission: It is formed in the modem, and is output.

3.Speaker amplifier section

•The volume of the ringer sound/speaker sound is controlled with 3-bit signal of VOLA, VOLB and VOLC, and the sound switch is controlled with BZ CONT.

4.Ringer circuit section

•The ringer sound is formed in the tone of 1-chip engine when CI signal is detected. The amplifier circuit drives the speaker of the main body.

5 – 8

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Contents Facsimile Il y a danger d’explosion s’ il y a remplacement incorrect Specifications Operation panel Transmittable documents Site selection InstallationUse of Document Carrier Sheet ConnectionsOriginal document support Loading the fax paperClearing a jammed document Clearing jammed fax paperFunction key menu Using the answering machineQuick reference guide Transmitting documentsAdjustments Diagnostic items Diagnostics and service soft switchOperating procedure Entering the diagnostic mode Check pattern mode Diagnostic items description Soft switch modeAging mode Signal send modeFlash memory check How to make soft switch settingEntry data receive Flash memory clearOption Soft switch descriptionData No. = X 60 sec = 5 min Recall times Binary input Light Dark Darker TEL 0~9 No. = CNG detection in STAND-BY mode Yes Fax switching when A.M. full Yes 10 ~ 25 dBm No. = 12 dB AGC eref access code line Reserved Speaker volume 5 stages Soft switch function description SW-B4 No Auto dial mode Delay timer of after line connect SW-A6 No CNG transmission in manual TX modeSW-B4 No Auto dial mode Delay timer of before line connect SW-B4 No Dial modeSW-E1 No CNG detect time at TEL/FAX mode SW-D1 No Automatic switching manual to auto receive modeSW-E1 No Tel/Fax Automatic switching mode SW-F2 No CNG detection in STAND-BY modeSW-H1 No Reserved SW-H2 No Fax switching when A.M. fullSW-I2 No Alarm during two way recording SW-H1 No Busy tone continuous sound detect timeSW-J2 No ~ No Speaker volume 5 stages SW-J1 No Sender’s phone number settingSW-J1 No , No Ringer volume SW-K1 No Entering Diag mode by pressing Speed keyTroubleshooting ATTG3 Reception Error code tableCommunication error code table G3 Transmission General description Cross section view Documents requiring use of document carrierDocument release General Recording block 5-1. General viewDisassembly and assembly procedures Handset cover and paper support guidePWB case top, bottom and PWB Screwdriver Hook CIS support 11 ,13 Stopper plate Operation panel unit and scanner frameDocument guide upper unit and head frame Document guide upper LCD PWB Operation panelGAP Hopper Guide R Guide L 1211 Drive unit, PWB and cutterRib Speaker and paper sensor leverDrive frame 1811PWB Wire treatmentTEL/LIU Block diagram CutterControl PWB Unit Wiring diagramPower Supply PWB Unit TEL/LIU PWB UnitPoint- to-point diagram Circuit description Circuit description of control PWB Description of each block Main control blockFC200 IC2 Terminal descriptions GPIO0 2XC Ledctl 4XCLcdcs 1XC GPIO1/SASTXD 2XCPanel control block Mechanism/recording control blockModem R96V24 block IntroductionR96V24 IC1 Hardware Interface Signals Pin Signals 100-Pin PqfpTEL/LIU block operational description Block diagramCircuit description of TEL/LIU PWB Circuit descriptionExternally connected TEL OFF Hook detection circuit section Signal/DTMF transmission level & receiving levelSignal selection CI detection circuitExample TEL speaking Circuit description of power supply PWB Circuit description of CIS unitCircuit Block ControlPWBMemory block 44PIN TsopModem IC3Other block 2902Video processing/Motor drive / Thermal block ULN2003AAnalog signal block IC5Control PWB parts layout Top side Control PWB parts layout Bottom side These marks are all safety-critical parts TEL/LIU PWB circuitTEL/LIU PWB parts layout Power supply PWB circuit NJM78M05FAPower supply PWB parts layout Operation panel PWB circuit IC101 74HC147Operation Flowchart ProtocolPower on sequence Relay board unit Service toolsList Description Relay board unit OFFShading paper IC7 VHiW24257S7LL W24257S-70LLT IC signal nameIC13 VHiULN2003AN/ ULN2003A IC3 VHiMC74HCU04FMC74HCU04F IC6, 10 VHiHCF4053M1T HCF4053BIC4 VHiMC34119DR2 MC34119DR2 IC11, 12 VHiLM2902D/-1 LM2902D IC8 VHi27C02015TiIC5 VHiHEF4051BT1 HEF4051BT IC100 VHiPST596CMT1 PST596CNRIC1 VHiR96FC20V24 R96V24 IC2 VHiR96FC20V24 FC200 IC1 VHiNJM2904D-1 NJM2904D