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Sharp Warm & Toasty R-55TS Service Manual Download Page 22

20

R-55TS

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

4) Follow the troubleshooting guide given below for repair.

STEPS

OCCURRENCE

CAUSE OR CORRECTION

1

Only pattern at “a” is broken.

*Insert jumper wire J1 and solder.

2

Pattern at “a” and “b” are broken.

*Insert the coil RCILF2003YAZZ between “c” and “d”.

5) Make a visual inspection of the varistor.

Check for burned damage and examine
the transformer with a tester for the
presence of layer short-circuit (check
the primary coil resistance which is
approximately 218

Ω

 

±

  10%). If any

abnormal condition is detected, replace
the control unit.

6) Reconnect all leads removed from components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the outer case is installed.
9) Run the oven and check all functions.

2. Follow the troubleshooting guide given below, if indicator does not light up after above check and

repairs are finished.
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 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.

STEPS

OCCURRENCE

CAUSE OR CORRECTION

The rated AC voltage is not present between

1

Pin Nos. 5 and 7 of the 7-pin connector (A).

Check supply voltage and oven power cord.

2

The rated AC voltage is present at primary

Low voltage transformer or secondary circuit defective.

side of low voltage transformer.

Check and replace control unit.

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) Reconnect all leads removed from components during testing.
12) Re-install the outer case (cabinet).
13) Reconnect the power supply cord after the outer case is installed.
14) Run the oven and check all functions.

VRS1

7

T1

J1

D4

a

b

c

d

Summary of Contents for Warm & Toasty R-55TS

Page 1: ... BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING INSIDE FRONT COVER WARNING TO SERVICE PERSONNEL 1 MICROWAVE MEASUREMENT PROCEDURE 2 FOREWORD AND WARNING 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLESHOOTING GUIDE 11 TEST PROCEDURE 13 TOUCH CONTROL PANEL 21 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE...

Page 2: ...ransmission 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 an operative unit perform a microwave emission check as per the Microwave Mea...

Page 3: ...citor 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 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 capacitor 4 Reconnect...

Page 4: ...e 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 Mode 5 Close the d...

Page 5: ... not damaged D The door is not deformed or warped E There is no other visible damage with the oven Servicing and repair work must be carried out only by trained service personnel DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized High Voltage C...

Page 6: ...y Standard UL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J SPECIFICATION GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances In the event of an electrical short circuit...

Page 7: ...securely on the turntable support The turntable will rotate clockwise or counterclockwise Only remove for cleaning or for the foods specified in this manual 9 Top grill heater top heater 10 Bottom grill heater bottom heater The bottom heater is under the cavity floor 11 Ventilation openings rear 12 Oven light It will light when oven is operating or door is open 13 Waveguide cover DO NOT REMOVE 14 ...

Page 8: ...switch relay RY1 and primary interlock relay are activated with the following results The circuits to the turntable motor the cooling fan motor and the high voltage components are de energized the oven lamp remains on and the digital read out displays the time still remaining in the cook cycle when the door was opened 8 The monitor switch electrically monitors the operation of the secondary interl...

Page 9: ...dial When the START pad is touched the following operations occur Figure O 5 PREHEATING CONDITION 2 The coil of shut off relays RY1 RY2 RY3 RY4 and RY5 are energized 3 The contacts of the select relay will close between the common and normal close terminal 4 The numbers of the digital read out start the count down to zero 5 Then the upper heater lower heater turntable motor oven lamp and fan motor...

Page 10: ... SWITCH TTM OL FM C T FUSE THERMAL CUT OUT N O N O N O N O N C C1 COM COM COM COM DOOR SENSING SWITCH THREMISTOR OVEN THERMOSTAT UPPER HEAER LOWER HEAER RY5 RY1 RY3 CONTROL UNIT PRIMARY INTERLOCK RELAY GRN C2 CAPACITOR 0 82µF AC 2100V E3 A7 A1 A5 B3 B1 B5 RY4 RY2 B2 SELECT RELAY 120V AC 60 Hz OVEN LAMP FAN MOTOR TURNTABLE MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER MAGNETRON SECONDARY INTERLO...

Page 11: ...g Condition 120V AC 60 Hz OVEN LAMP FAN MOTOR TURNTABLE MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER MAGNETRON SECONDARY INTERLOCK SWITCH TTM OL FM C T FUSE THERMAL CUT OUT N O N O N O N O N C C1 COM COM COM COM DOOR SENSING SWITCH THREMISTOR OVEN THERMOSTAT UPPER HEAER LOWER HEAER RY5 RY1 RY3 CONTROL UNIT PRIMARY INTERLOCK RELAY GRN C2 CAPACITOR 0 82µF AC 2100V E3 A7 A1 A5 B3 B1 B2 B5 RY4 RY2...

Page 12: ...TERLOCK RELAY RY2 SECOND ARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION RE FER TO CHAPTER TEST PROCEDURE NOTE C TFUSEANDMONITORSWITCHAREREPLACED AS AN ASSEMBLY 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 direction COOLING FAN MOTOR The cooling fan...

Page 13: ...y to connect the power supply cord after the outer case has been removed in this event 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 transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that pr...

Page 14: ... when power cord is plugged into wall outlet Display does not operate properly when STOP CLEAR pad is pressed Oven does not start when the START pad is pressed Display operates Oven lamp does not light Turntable motor operates Fan motor does not operate Oven lamp lights Turntable motor does not operate Oven lamp lights Oven or electrical parts does not stop when cooking time is 0 or STOP CLEAR pad...

Page 15: ...couple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at P100 100 selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown 3 Remove the cup from the oven and again measure the temperature making sure to...

Page 16: ... an ohmmeter to see if it is shorted between either of the terminals and case If it is shorted replace the capacitor 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL SO DO NOT ATTEMPT TO MEAS...

Page 17: ...ll be activated by relay RY1 PRIMARY INTERLOCK RELAY RY2 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 two 2 wire leads from the male tab terminals of the Primary Interlock Relay Check the state of the relay contacts using a ohmmeter The relay contacts should be open If the relay contacts are closed r...

Page 18: ...mpere fuse and switch A continuity check across the C T fuse terminals should indicate a closed circuit unless the temperature of the C T fuse reaches approximately 302 F 150 C An open C T fuse indicates overheating of the magnetron Check for restricted air flow to the magnetron especially the cooling fan air guide CAUTION IF THE C T FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE REPLACE THE C...

Page 19: ...be used A low priced bi metal type thermometer is not reliable or accurate The temperature should be checked with outer case cabinet installed approx 5 minutes after preheat temperature is reached audible signal sounds four times The temperature experienced may be approx 30 F more or less than indicated on the display however in most cases the food cooking results will be satisfactory Difference i...

Page 20: ...Proper temperature measurement is not obtained When 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 capacitor 4 Reconnect all leads removed from components during 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 fu...

Page 21: ...rox 23 4V D C Lower heater RY5 Approx 24 2V D C Fan motor SELECT RELAY Approx 23 4V D C Power transformer Upper heater Lower heater 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 Reconnect all leads removed from components during testing 12 Re install the outer case cabinet 13 Reconnect the power supply cord af...

Page 22: ...sconnect 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 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 f...

Page 23: ...Power Source Circuit This circuit generates voltage necessary in the control unit Symbol Voltage Application VC 5 2V LSI IC1 3 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 4 Reset Circuit A circuit to generate a signal which re...

Page 24: ... Terminal not used 14 P54 OUT Signal to sound buzzer A key touch sound B Completion sound C When the temperature of the oven cavity reaches the preset temperature in the preheating mode or when the preheating hold time 30 minutes is elapsed 15 P53 OUT Magnetron high voltage circuit driving signal To turn on and off the select relay In 100 POWER operation the signals hold L level during microwave c...

Page 25: ...EN THERMISTOR H level GND Thermistor OPEN timing L level 5V Temperature measuring timing Bake cooking 29 P70 OUT Terminal not used 30 XIN IN Internal clock oscillation frequency input setting The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal 31 XOUT OUT Internal clock oscillation frequency control output Output to control oscillat...

Page 26: ...ched 44 P14 OUT Tact switch strobe signal Signal applied to tact switch section A pulse signal is input to P24 P27 terminal while one of tact swithes SW13 SW14 SW15 on matrix is touched 45 48 P13 P10 IN Terminal not used 49 56 P07 P00 OUT Terminal not used 57 59 P37 P35 IN Terminal not used 60 72 SEG12 SEG0 OUT Segment data signal Connected to LCD The relation between signals are as follows LSI si...

Page 27: ...n it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor related controls of the touch control panel by using the dummy resistor s 3 Servicing Tools Tools required to service the touch control panel assembly 1 Soldering iron 30W It is recommended to use a soldering iron with a grounding terminal 2 Oscilloscope Single beam frequency range ...

Page 28: ...nd that the iron temperature is adjusted accordingly 3 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 wil...

Page 29: ...this causes the latch leads to rise it is then possible to hear a click as the door switches operate 3 Visually check the door and cavity face plate for damage dents cracks signs of arcing etc Carry out any remedial work that is necessary before operating the oven Do not operate the oven if any of the following conditions exist 1 Door does not close firmly 2 Door hinge support or latch hook is dam...

Page 30: ...Remove one 1 screw holding high voltage rectifier assembly to capacitor holder 9 Disconnect rectifier terminal from capacitor High voltage rectifier assembly is now free 10 Remove capacitor holder Capacitor is now free CAUTION WHEN REPLACING HIGH VOLTAGE RECTI FIER AND HIGH VOLTAGE CAPACITOR GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW CAUTION 1 ...

Page 31: ...f Removal of MAGNETRON REPLACEMENT 5 Remove the one 1 screw holding the oven lamp to the air duct 6 Now the oven lamp is free Terminal Push Pull down 1 2 Lever Positive lock connector 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 wire leads and connectors from control unit CONTROL PANEL ASSEMBLY R...

Page 32: ...rier to the oven cavity 17 Remove the bottom plate assembly with the main wire LOWER HEATER REMOVAL harness from the oven cavity assembly 18 Remove the three 3 screws holding the bottom reflector to the oven cavity 19 Straighten the two 2 tabs of the bottom reflector and remove the bottom reflector from the oven cavity 20 Lift up the stopper and remove the lower heater 21 Now lower heater is free ...

Page 33: ...th air duct and the reflector from the waveguide flange referring to the items 4 10 of Removal of MAGNETRON REPLACEMENT 5 Remove the control panel assembly from the oven cavity front flange Refer to the CONTROL PANEL ASSEMBLY REMOVAL 6 Disconnect wire leads from the switches 7 Slide the switch lever rightward and remove it from the oven cavity front flange 8 Remove two 2 screws holding latch hook ...

Page 34: ...ftward and insert the left edge of the front door glass into the three 3 long tabs of the door frame 4 Reinstall the door glass stopper so that the glass stopper catch the upper and right corner of the front door glass 5 Reinstall the latch spring to the latch head Reinstall the latch spring to the door frame Reinstall the latch head to misadjustment the following adjustment should be made 4 Loose...

Page 35: ...om 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 microwave survey meter Refer to Microwave Measurement Procedure Note The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during co...

Page 36: ...T WHT RED GRN GRN BLK BLK WHT WHT BLU BLU RED WHT WHT RED RED RED C T FUSE FAN MOTOR TURNTABLE MOTOR CONTROL UNIT SELECT RELAY BLK 2 1 WHT WHT WHT WHT WHT BLK BLU CN C H N NOTE The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw The screw must allways be kept tight RED WHT WHT WHT GRN 5 4 CN B BLK WHT BRN BRN CN A WHT RED 2 3 1 5 4 7 6 2 3 1 2 BLK 3...

Page 37: ... Q26 Q24 Q22 B3 Q25 1W 3 60 R2 1W 360 R3 1K 35V 10u R4 C7 J2 J5 J4 J7 J6 R7 R6 C5 4 7K C30 J1 D25 D24 D21 RY5 RY4 RY1 D23 Q21 C20 0 1u 50V 4 7K C3 50V 0 1u Q2 NOTE A B C R50 R51 R52 R53 4 7K 100K 100K 4 3 2 1 11 10 9 5 6 11 10 9 5 6 4 3 2 1 Q40 C52 C54 C53 CN D WH B SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG11 SEG10 COM2 COM1 COM0 B5 A1267Y 50V 0 1u 13P HARNESS KRC243M IF NOT SPECIFIED ...

Page 38: ... WH A SW14 SW13 2 3 SNACKS TOAST BAKE MICRO Q TY TIME DCUT 10 C50 1 C51 R52 R51 R53 R50 R64 R62 R12 R42 E B B B B 1 3 Q25 C4 17 12 24 J8 D24 D23 D22 R21 ZD3 D21 R9 J9 25 R4 R20 R45 R8 R6 R31 R10 Q4 Q21 R3 E E E CN E CN D CN C CN B D27 35 D3 C3 C1 Q40 R1 J1 D4 E B E B 27 12 CF1 R60 18 WH B LD4 LD5 LD6 SW15 SW1A SW10 GRILL SW11 SW9 REHEAT SW5 REHEAT SW5 BEVERAGE BAKE SW12 9 8 POPCORN SW7 FROZEN ENTR...

Page 39: ...PANEL PARTS 3 1 XEBSD30P08000 Screw 3mm x 8mm 12 AA 3 2 DPWBFC339WRKZ Control unit 1 BH 3 3 FPNLCB754WRKZ Panel sub assembly 1 BB 3 3 1 JBTN B246WRFZ Open button 1 AH 3 3 2 JBTN B247WRFZ Select button 1 AQ 3 3 3 MSPRCA143WREZ Button spring 1 AE 3 3 4 FKNBKA217WRKZ Timer knob assembly 1 AQ 3 4 PCUSGA617WRPZ LCD cushion 3 AB OVEN PARTS 4 1 PHOK A132WRFZ Latch hook 1 AH 4 2 LBNDKA151WRPZ Capacitor ba...

Page 40: ...n manual 1 AG 6 3 TLABMA911WRRZ Menu label 1 AE 6 4 NTNT A070WRH0 Turntable 1 AR 6 5 FW VZB979WREZ Main wire harness 1 AX 6 6 TCAUAA283WRRZ Monitor caution 1 AT 6 7 TCAUAA284WRRZ DHHS caution label 1 AS SCREWS NUTS AND WASHERS 7 1 XCPSD40P06000 Screw 4mm x 6mm 1 AA 7 2 XFPSD40P10000 Screw 4mm x 10mm 3 AA 7 3 XFPSD40P08000 Screw 4mm x 8mm 1 AA 7 4 XFTSD40P08000 Screw 4mm x 8mm 4 AA 7 5 XHPSD30P0600...

Page 41: ...3 4 18 1 15 7 5 7 22 4 26 1 14 7 21 4 34 4 4 4 3 4 7 4 9 4 11 4 10 4 8 4 24 4 22 7 20 4 28 4 16 1 6 6 1 6 4 1 13 7 6 2 1 4 5 1 5 4 2 7 16 4 38 7 19 7 3 7 5 7 4 7 4 7 4 7 4 4 14 1 2 7 19 4 36 7 15 4 17 6 6 4 13 7 10 7 17 7 9 1 12 4 15 1 2 7 7 1 10 4 1 1 1 1 1 4 35 7 19 7 24 7 7 7 1 1 4 1 8 7 2 7 2 x2 x2 7 16 7 16 7 20 2 2 2 2 7 7 7 7 7 20 7 11 7 12 1 9 4 6 7 16 7 13 7 13 4 20 4 12 4 32 4 29 7 26 7 ...

Page 42: ...B C D E F G H A B C D E F G H DOOR PARTS CONTROL PANEL PARTS MISCELLANEOUS 3 1 4 21 5 5 1 5 4 5 6 5 3 5 2 5 5 5 7 6 5 5 7 3 2 3 4 3 1 3 3 3 3 1 3 3 2 3 3 3 3 3 4 Actual wire harness may be different from illustration Sus cover Door frame ...

Page 43: ... TOP PAD ASSEMBLY FPADBA527WRKZ 6 1 TURNTABLE SUPPORT 6 4 TURNTABLE WRAP COVER SSAKHA076WRE0 BOTTOM PAD ASSEMBLY FPADBA528WRKZ PACKING CASE SPAKCD942WREZ WRAP COVER SSAKHA086WREZ CABINET COVER SPADPA632WREZ 6 2 OPERATION MANUAL 6 3 MENU LABEL inside operation manual ...

Page 44: ...BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher ...

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