Sharp R-1750 Wartungshandbuch

R-1750R-1751R-1752R-1754In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specifi

8R-1750R-1751R-1752R-17542. HORIZONTAL VENTINGThe air handing is the same as VERTICAL VENTINGexcept that the final air discharge is directed horizonta

9R-1750R-1751R-1752R-1754Wave-form of main parts are shown in Figure A-2.During off-time, flyback voltage appears on the primarywinding of the high vo

10R-1750R-1751R-1752R-1754SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED2. COOKING TIME PROGRAMMED3. VARIABLE COOKING CONTROL "HIGH"4. "

11R-1750R-1751R-1752R-1754Figure O-3. Inverter Unit CircuitMAC3PWMMCKVSMCK(CN-A)VS(CN-A)CN-AOSCOSCENINTPAGNDQ50AGNDVP0VCCOUTVSVP24.7K39KVP1IA111910182

12R-1750R-1751R-1752R-1754Figure O-4. Printed Wiring Board for Inverter Unit Circuit3FA930DRR42ECGEEMEEBE++R43J6M1M2ZD40C41J3Q3Q2Q4C51R56R71Q70R71C70C

13R-1750R-1751R-1752R-1754DESCRIPTION AND FUNCTION OF COMPONENTSDOOR OPEN MECHANISMThe door is opened by pulling the door handle, refer to theFigure D

14R-1750R-1751R-1752R-1754STIRRER MOTORThe stirrer motor drives the stirrer fan to stir the microwaveradiation from the waveguide.HOOD LAMPThe hood la

15R-1750R-1751R-1752R-1754CK = Check / RE = ReplacePOSSIBLE CASE AND DEFECTIVE PARTSPROBLEMTEST PROCEDURECONDITIONOFFCONDITIONIDLECONDITIONMICROWAVECO

16R-1750R-1751R-1752R-1754B INVERTER UNIT TESTTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer c

17R-1750R-1751R-1752R-1754Chart for checking the defective inverter unitNo power at full power output cookingVaristor VRS2 or/and foil pattern openon

R-1750R-1751R-1752R-1754PRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVE ENERGY(a) Do not operat

18R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTDescription of main partsSYMBOL PART NAME FUNCTIONC11, C12 High voltage capacito

19R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TEST4. Transistor Q2 and Q3Check the resistance of transistor Q2 andQ3 by using ohmm

20R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTD PRIMARY INTERLOCK SWITCH AND SECONDARY INTERLOCK SWITCH TEST1. Disconnect the

21R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTH HOOD THERMAL CUT-OUT TEST1. Disconnect the power supply cord, and then remove

22R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTJ TOUCH CONTROL PANEL ASSEMBLY TESTThe touch control panel consists of circuits

23R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1) Disconnect the power supply cord, and then remove outer case.2) Open the door

24R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTTo protect the electronic circuits, this model is provided with a fine foil patt

25R-1750R-1751R-1752R-1754TEST PROCEDURESPROCEDURELETTERCOMPONENT TEST6) After that procedure, re-connect the power supply cord.7) Follow the troubles

26R-1750R-1751R-1752R-1754(4) Remove the AH sensor.(5) Install the new AH sensor.(6) Reconnect all leads removed from components during testing.(7) Re

27R-1750R-1751R-1752R-1754TOUCH CONTROL PANEL ASSEMBLYOUTLINE OF TOUCH CONTROL PANELIn addition, the synchronizing signal is available in orderto comp

1R-1750R-1751R-1752R-1754WARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact wi

28R-1750R-1751R-1752R-1754DESCRIPTION OF LSILSI(IZA958DR)The I/O signal of the LSI(IZA958DR) is detailed in the following table.Pin No. Signal I/O Des

29R-1750R-1751R-1752R-175421 P41 OUT Key strobe signal.Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal whileone of

30R-1750R-1751R-1752R-1754Pin No. Signal I/O Description69 XTAL IN Internal clock oscillation frequency control input setting.The internal clock frequ

31R-1750R-1751R-1752R-1754(1) Structure of Absolute Humidity SensorThe absolute humidity sensor includes two thermistorsas shown in the illustration.

32R-1750R-1751R-1752R-17541. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of thecircuits. When handling

33R-1750R-1751R-1752R-1754Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts mayresult

34R-1750R-1751R-1752R-1754REMOVAL OF OVEN FROM WALL (It is recommended that two people remove the oven)1. Disconnect the power supply cord, and uncoil

35R-1750R-1751R-1752R-17541. Disconnect the power supply cord and remove the ovenfrom wall and remove outer case. (Refer to procedure of"Removal

36R-1750R-1751R-1752R-17541. Disconnect the power supply cord, remove the ovenfrom wall and remove outer case (Refer to procedure of"Removal of O

37R-1750R-1751R-1752R-17541. Disconnect the power supply cord.2. Open the door and block it open.3. Remove the three (3) screws holding the base cover

2R-1750R-1751R-1752R-1754MICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwa

38R-1750R-1751R-1752R-1754TerminalPushPull down12LeverPositive lock®connectorPOSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL1. Disconnect the power s

39R-1750R-1751R-1752R-1754following adjustment should be made.5. Loosen the two (2) screws holding latch hook to the ovencavity front flange.6. With d

40R-1750R-1751R-1752R-1754LATCH SPRING, LATCH HEAD AND DOOR PANEL13.Release the latch spring from the tab of the latch headand tab of the door frame.1

41R-1750R-1751R-1752R-1754645123645123ABCDEFGHABCDEFGHFigure S-1. Pictorial DiagramHIGH VOLTAGE COMPONENTSCONTROL UNIT(POWER UNIT)(LSI UNIT)Power Supp

42R-1750R-1751R-1752R-1754645123645123ABCDEFGHABCDEFGHFigure S-2. Power Unit CircuitA 5T1RY1RY2RY4RY3R2 91 1w CN-ACN-BCN-ECN-C12pin WIREHARNESSACACINV

43R-1750R-1751R-1752R-1754Figure S-3. LSI Unit CircuitC 1 C 2C 8C 7F 1F 2F 3H 1H 2C 3C12G 7G 1 G 2WH-1 WH-1IC2IXA062DRCPU UNITIC5 IXA031DRLIQUID CRYST

44R-1750R-1751R-1752R-1754645123645123ABCDEFGHABCDEFGHFigure S-4. Printed Wiring BoardDIP9HXALCOMH.M H.MR110C110CN - ECN - AC100CN - CDOOR SWSP301753R

45R-1750R-1751R-1752R-1754PARTS LISTNote: The parts marked “∆” may cause undue microwave exposure.The parts marked “*” are used in voltage more than 2

46R-1750R-1751R-1752R-1754REF. NO. PART NO. § DESCRIPTION Q'TY CODEQ1 VS2SD1859//-3 J Transistor (2SD1859R) 1 ACR1 VRD-B12EF242J J Resistor

47R-1750R-1751R-1752R-1754REF. NO. PART NO. § DESCRIPTION Q'TY CODE5-2-5 GWAKPB118MRF0 M Door frame [R-1751] 1 AZ5-2-5 GWAKPB119MRF0 M Door fram

3R-1750R-1751R-1752R-1754SHARP ELECTRONICS CORPORATIONSHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135SERVICE MANUALOVER THE RANGEMICROWAVE OVENR-1750 / R-17

48R-1750R-1751R-1752R-1754645123645123ABCDEFGHABCDEFGHOVEN AND CABINET PARTS1-127-32-12-54-137-104-154-192-67-44-234-247-36-107-57-34-17-1 1-21-137-81

49R-1750R-1751R-1752R-1754CONTROL PANEL PARTSMISCELLANEOUSDOOR PARTS6-66-193-33-23-43-15-55-255-15-65-75-35-44-215-63-43-3-23-3-33-3-15-2-35-2-15-2-4

50R-1750R-1751R-1752R-17542000 SHARP CORP. (8S2.530E) Printed in U.S.ACOPYRIGHT © 2000 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publica

4R-1750R-1751R-1752R-1754ITEM DESCRIPTIONPower Requirements 120 Volts / 14 Amperes / 1600 W60 HertzSingle phase, 3 wire groundedPower Output 1100 watt

5R-1750R-1751R-1752R-1754Electrical RequirementsThe oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THEGR

6R-1750R-1751R-1752R-1754OPERATIONDESCRIPTION OF OPERATING SEQUENCE CONTROL PANELThe following is a description of component functions duringoven oper

7R-1750R-1751R-1752R-17541. The contacts of relays are closed and componentsconnected to the relays are turned on as follows.(For details, refer to Fi