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R305MR

12 – 1

R305MR

Service Manual

CHAPTER 12.

CIRCUIT DIAGRAMS

[1] Pictorial Diagram (Figure S-1)

Figure S-1. Pictorial Diagram

HIGH

VOLTAGE

CAPACITOR

H.V.

RECTIFIER

HIGH

VOLTAGE

COMPONENTS

MAGNETRON

COM.

MONITOR

SWITCH

COM.

N.O.

N.C.

DOOR

SENSING

SWITCH

SECONDARY

INTERLOCK

SWITCH

TURNTABLE

MOTOR

POWER

TRANSFORMER

COM.

NO

GRY

W

H

T

WHT

GRY

RED

GRY

GRY

R

E

D

P

N

K

B

L

K

W

H

T

R

E

D

GRN

GRY

GRY

GRN

BLK

GRY

WHT

GRY

RED

RED

GRN

BLK

PNK

GRY

C/T

FUSE

FUSE

NOISE

FILTER

FAN

MOTOR

BLK

WHT

2

1

WHT

WHT

WHT

RED

RY1

PRIMARY

INTERLOCK

RELAY

CN-B

CN-B

T1

1

2

RY2

CONTROL

UNIT

GRY

OVEN

LAMP

PNK

RED

RED

PNK

RED

WHT

Power

Supply

Cord

Screw

Oven

Cavity

Back

Plate

L

N

Connect

the

wire

lead

which

has

the

black

case

to

the

terminal

"L"

of

the

noise

filter.

GRY

GRY

THERMAL

CUT-OUT

(OVEN)

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Summary of Contents for R-305MR

Page 1: ...E CHAPTER 12 CIRCUIT DIAGRAMS Parts List S1701R305MPR SERVICE MANUAL R305MR CONTENTS This document has been published to be used for after sales service only The contents are subject to change without notice TopPage MICROWAVE OVEN R 305MR MODEL In the interest of user safety the oven should be restored to its origi nal condition and only parts identical to those specified should be used WARNING TO...

Page 2: ...9 H BLOWN MINITOR FUSE TEST 8 3 10 I NOISE FILTER TEST 8 4 11 J TOUCH CONTROL PANEL ASSEM BLY TEST 8 4 12 K KEY UNIT TEST 8 5 13 L RELAY TEST 8 6 14 M DEFROST TEST 8 6 15 N FOIL PATTERN ON THE PRINTED WIRING BOARD TEST 8 6 CHAPTER 9 TOUCH CONTROL PANEL ASSEM BLY 1 OUTLINE OF TOUCH CONTROL PAN EL 9 1 2 SERVICING FOR TOUCH CONTROL PANEL 9 2 CHAPTER 10 PRECAUTIONS FOR USING LEAD FREE SOLDER CHAPTER 1...

Page 3: ...components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner BEFORE SERVICING Before servicing a...

Page 4: ...gh voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord 2 When the testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capa...

Page 5: ...he oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Set the cooking control on Full Power Cooking M...

Page 6: ... and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is not any other visible damage with the oven Servicing and repair work must be carried out only by trained service personnel 3 DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the follo...

Page 7: ...ess Depth 15 1 4 387mm Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 minutes 99 seconds Microwave Power for Variable Cooking Repetition Rate P HI Full power throughout the cooking time P 90 approx 90 of FULL Power P 80 approx 80 of FULL Power P 70 approx 70 of FULL Power P 60 approx 60 of FULL Power P 50 approx 50 of FULL Power P 40 approx 30 of FULL Power P 30 approx 40 of F...

Page 8: ...have it replaced with a properly grounded three pronged wall receptacle or have a grounding adapter properly grounded and polarized If the extension cord must be used it should be a 3 wire 15 amp or higher rated cord Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRO...

Page 9: ...NEL NOTE Some one touch cooking features such as MINUTE PLUS are disabled after three minutes when the oven is not in use These fea tures are automatically enabled when the door is opened and closed or the STOP CLEAR pad is pressed ...

Page 10: ...time still remaining in the cook cycle when the door was opened 7 The monitor switch electrically monitors the operation of the sec ondary interlock switch and primary interlock relay and is mechani cally associated with the door so that it will function in the following sequence a When the door opens from the closed position the primary interlock relay RY2 and secondary interlock switch open thei...

Page 11: ...Y INTERLOCK RELAY GRN B2 CAPACITOR 0 19μF AC 2100V B1 FUSE 20A NOISE SUPPRESSION COIL LINE CROSS CAPACITOR 0 22μF AC 250V LINE BYPASS CAPACITOR 0 0033μF AC 125V LINE BYPASS CAPACITOR 0 0033μF AC 125V L N NOISE FILTER MAGNETRON MAGNETRON OR OR OVEN NOTE indicates components with potentials above 250V 120V AC 60 Hz OVEN LAMP OVEN LAMP RELAY TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER MONITOR SWITCH...

Page 12: ...R SENSING SWITCH PRIMARY INTERLOCK RELAY RY2 SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAPTER TEST PROCEDURE NOTE MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY 4 TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the food on the turntable is cooked evenly The turntable may turn in either direct...

Page 13: ...the power transformer 5 Reinstall the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions 1 TROUBLESHOOTING CHART RE CK A B C D E F F G H RE RE CK J CK CK CK K L N I POSSIBLE CASE AND DEFECTIVE PARTS SHORT IN POWER CORD SHORT OR OPENED WIRING MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR TEMPERATU...

Page 14: ...g sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot water temperature The normal result should be32 1 to 59 7 F 17 9 to 33 2 C rise in tempera ture If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has...

Page 15: ...de An open temperature fuse Oven or thermal cut out Oven indicates overheating of the oven exchange the temperature fuse or thermal cut out and check inside of oven cavity and for improper setting of cooking time or operation of control unit Check for restricted air flow through the vent holes of the oven cavity especially the cooling fan and air guide 6 Reconnect all leads removed from components...

Page 16: ...igh voltage capacitor 4 Before performing this test make sure that the secondary interlock switch and the primary interlock relay are operating properly according to the above Switch Test Procedure Disconnect the wire lead from the monitor switch COM terminal Check the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed circuit When th...

Page 17: ...to two units Control Unit and Key Unit and also the Control Unit is divided into two units CPU Unit and Power Unit and troubleshooting by unit replacement is described according to the symptoms indicated Before testing 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the power...

Page 18: ...ng testing 5 Re install the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions 12 K KEY UNIT TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Using an ohmmeter and referring to the key unit matrix indicated on the control unit circuit c...

Page 19: ...ord after the outer case is installed 14 Run the oven and check all functions 14 M DEFROST TEST WARNING The oven should be fully assembled before following procedure 1 Place one cup of water in the center of the turntable tray in the oven cavity 2 Close the door touch the DEFROST pad once And then touch the number pad 2 3 Touch the number pad 5 and then touch the start pad 4 The oven is in Defrost...

Page 20: ...o the primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply cord 7 Follow the troubleshooting guide given below for repair 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 11 Reconn...

Page 21: ...which resets the LSI to the initial state when power is supplied 2 Indicator Circuit This circuit consists of 14 segments and 3 common electrodes using a Liquid Crystal Display 3 Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage In addition the synchronizing signal is avail able in order to compose a basic standard time in the clock circuit...

Page 22: ...e oven itself is so short that the two can t be separated For those models check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven b On some models the power supply cord between the touch control panel and the oven proper is so long enough that they may be separated from each other For those models therefore it is possible to...

Page 23: ... adjusted accordingly Soldering As the melting point of lead free solder Sn Ag Cu is higher and has poorer wettability flow to prevent damage to the land of the PWB extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time Remove the bit as soon as a good flow is achieved The high content of tin in lead free solder will cause premature corrosion of th...

Page 24: ...t close firmly 2 Door hinge support or latch hook is damaged 3 The door gasket or seal is damaged 4 The door is bent or warped 5 There are defective parts in the door interlock system 6 There are defective parts in the microwave generating and transmission assembly 7 There is visible damage to the oven Do not operate the oven 1 Without the RF gasket Magnetron 2 If the wave guide or oven cavity are...

Page 25: ...r to PICTORIAL DIAGRAM 4 Reinstall outer case and check that oven is operating properly 4 HIGH VOLTAGE COMPONENTS REMOVAL HIGH VOLTAGE CAPACITOR AND HIGH VOLT AGE RECTIFIER ASSEMBLY To remove the components proceed as follows 1 Disconnect the power supply cord and remove outer case 2 Open the oven door and block it open 3 Discharge high voltage capacitor 4 Disconnect the high voltage wire of the p...

Page 26: ...D holder and the rubber connector from the control panel frame 7 Tear away the graphic sheet from the control panel frame 8 Tear away the membrane switch from the control panel frame 2 REINSTALLATION 1 Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol 2 Tear the backing paper from the new membrane switch 3 Insert the ribbon cable of the membrane swit...

Page 27: ... the fan blade from the fan motor shaft according to the fol lowing procedure 7 Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers CAUTION Make sure that no metal pieces enter the gap between the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced Do not touch the pliers to the coil of the fan motor bec...

Page 28: ...d into the square hole of the rear cabinet referring to the Figure C 3 b 2 Install the earth wire lead of power supply cord to the oven cavity back plate with one 1 screw and tight the screw 3 Connect the gray wire leads of power supply cord to the noise filter correctly referring to the Pictorial Diagram 4 Re install outer case and check that the oven is operating properly Figure C 3 a Power Supp...

Page 29: ...when in the latched position First check upper position of latch hook pushing and pulling upper portion of door toward the oven face Then check lower portion of the latch hook pushing and pulling lower portion of the door toward the oven face Both results play in the door should be less than 0 5mm 2 The door sensing switch and secondary interlock switch interrupt the circuit before the door can be...

Page 30: ...e following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate 4 Check for microwave leakage around door with an approved micro wave survey meter Refer to Microwave Me...

Page 31: ...LE MOTOR POWER TRANSFORMER COM NO GRY W H T WHT GRY RED GRY GRY R E D P N K B L K W H T R E D GRN GRY GRY GRN BLK GRY WHT GRY RED RED GRN BLK PNK GRY C T FUSE FUSE NOISE FILTER FAN MOTOR BLK WHT 2 1 WHT WHT WHT RED RY1 PRIMARY INTERLOCK RELAY CN B CN B T1 1 2 RY2 CONTROL UNIT GRY OVEN LAMP PNK RED RED PNK RED WHT Power Supply Cord Screw Oven Cavity Back Plate L N Connect the wire lead which has th...

Page 32: ... 2 Control Unit Circuit Figure S 2 Figure S 2 Control Unit Circuit 4 1 5 7 2 4 4 3 6 5 W 8 3 52 W 8 W 8 1 66 41 114 59 845 6 㨪 0 4 9 0 0 6 5 2 4 4 9 3 6 9 9 W 8 QT 5 5 8 㪜㪪㪛㪘㪜㪪㪚㪣㪢㪜㪪㪧㪞㪤㪙㪩㪜㪪㪜㪫㪭㪧㪧㪭㪚㪚㪭㪪㪪 a b d c ...

Page 33: ...R305MR 12 3 3 Printed Wiring Board of Power Unit Figure S 3 Figure S 3 Printed Wiring Board of Power Unit ...

Page 34: ...REF NO 3 PART NO 4 DESCRIPTION Parts marked may cause undue microwave exposure Parts marked are used in voltage more than 250V PartsGuide 1 OVEN PARTS 2 DOOR AND CONTROL PANEL PARTS INDEX CONTENTS DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA616WRKZ PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE FPAK A577WRKZ BOTTOM PAD ASSEMBLY FPADBA617WRKZ FOAM SHEET SPAKHA012WREZ IN...

Page 35: ... 2 1 7 1 1 13 1 2 1 7 7 3 1 10 1 9 4 10 7 10 7 10 7 8 4 11 7 5 4 17 4 18 7 4 7 10 1 5 1 4 4 2 1 1 1 1 1 11 7 7 7 10 7 10 7 7 6 3 7 10 7 9 7 2 7 2 7 10 7 10 7 10 7 6 1 12 7 8 4 8 1 8 7 11 7 8 1 2 2 3 2 2 4 12 4 6 4 14 7 1 1 3 4 16 4 15 1 6 7 1 6 1 6 2 6 5 4 7 2 3 2 3 4 12 2 3 ...

Page 36: ...Power transformer 1 10 RTRN A730WRZZ Power transformer for production use Interchangeable 1 11 RV MZA340WRZZ BH Magnetron 1 11 RV MZA288WRE0 BK Magnetron Interchangeable 1 11 RV MZA321WRZZ BH Magnetron Interchangeable 1 12 QFS TA014WRE0 AG Temperature fuse 150deg C Magnetron 1 12 RTHM A119WRE0 AK Thermal cut out 145C Magnetron Interchangeable 1 13 FPWBFA385WRKZ AV Noise filter assembly CABINET PAR...

Page 37: ...R305MR 4 2 DOOR AND CONTROL PANEL PARTS 3 2 6 7 3 4 3 6 3 7 3 2 1 3 2 4 3 2 2 3 2 5 3 3 3 1 3 5 3 2 6 3 2 7 6 6 5 1 5 3 3 2 3 5 2 5 4 5 9 5 5 5 7 5 6 5 8 5 8 5 8 5 8 ...

Page 38: ... 3 2 7 GMADIA142WRRZ AG Display window 3 3 LHLD A262WRFZ AF LCD holder 3 4 PSHEPA950WREZ AW LED SHEET 3 5 QCNC A024WRZZ AE Rubber connector 3 6 RLCDSA108DRZZ AU Liquid crystal display 3 7 XEPS730P08XS0 AA Screw 3mm x 8mm DOOR PARTS 5 1 FDORFA403WRTZ BF Door panel 5 2 PSHEPA382WRE0 AH Sealer film 5 3 GWAKPA998WRFZ AX Door frame 5 4 HPNL A841WRRZ AU Door screen 5 5 LSTPPA188WRF0 AG Latch head 5 6 MS...

Page 39: ...14WRPZ 1 4 14 AE PCUSGA615WRPZ 1 4 15 AE PCUSGA620WRPZ 1 4 6 AF PCUSGA681WRPZ 1 4 17 AF PCUSUA235WRP0 1 4 13 AE PCUSUA278WRP0 1 4 12 AB PDUC A833WRPZ 1 4 8 AM PDUC A854WRPZ 1 4 9 AL PHOK A145WRFZ 1 4 1 AL PPACGA176WREZ 1 4 10 AC PSHEPA382WRE0 2 5 2 AH PSHEPA950WREZ 2 3 4 AW PSHEPB114WREZ 2 3 2 5 AT PSPA A141WRFZ 1 4 18 AH Q QCNC A024WRZZ 2 3 5 AE QFS TA014WRE0 1 1 7 AG 1 1 12 AG QSW KA055DRZZ 2 3 ...

Page 40: ...ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in anyform or by any means electronic mechanical photocopying re cording or other wise without prior written permission of the publisher ...

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