Sharp R-2380 Service Manual

Commercial microwave oven

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SHARP

SERVICE MANUAL

S5001

R2380J//

COMMERCIAL

MICROWAVE

OVEN

MODEL

R-2380

In interests of user-safety

the oven should

be restored to its original

condition

and only manufacturer

original

spare parts must be used.

TABLE

OF CONTENTS

Page

CAUTION,

MICROWAVE

RADIATION

..........................................................................................................

GENERAL

IMPORTANT

INFORMATION

......................................................................................................

WARNING

..........................................................................................................................................................

PRODUCT

SPECIFICATIONS

.........................................................

. ...............................................................

APPEARANCE

VIEW

........................................................................................................................................

OPERATING

SEQUENCE

.................................................................................................................................

FUNCTION

OF IMPORTANT

COMPONENTS

..............................................................................................

COUNTER

CHECK

............................................................................................................................................

RESETTING

THE COUNTER

MEMORIES

..................................................................................................

SERVICING

.....................................................................................................................................................

TEST PROCEDURE

........................................................................................................................................

TOUCH

CONTROL

PANEL ...........................................................................................................................

COMPONENT

REPLACEMENT

AND ADJUSTMENT

PROCEDURE

.....................................................

MICROWAVE

MEASUREMENT

...................................................................................................................

TEST DATA AT A GLANCE

.......................................................

. ..................................................................

TEST POINT ON CONTROL

UNIT ...............................................................................................................

WIRING

DIAGRAM

.......................................................................................................................................

PICTORIAL

DIAGRAM

....................................................................................

-. .............................................

CONTROL

PANEL CIRCUIT

.........................................................................................................................

PRINTED WIRING

BOARD

..........................................................................................................................

SPARE PARTS LIST ......................................................................................................................................

SHARP CORPORATION

Table of Contents

Summary of Contents for Sharp R-2380

Page 1: Table Of Contents
SHARP SERVICE MANUAL S5001 R2380J// COMMERCIAL MICROWAVE OVEN MODEL R-2380 In interests of user-safety the oven should be restored to its original condition and only manufacturer original spare parts must be used. TABLE OF CONTENTS Page CAUTION, MICROWAVE RADIATION ......................
Page 2 R-2380...
Page 3: Caution, Microwave Radiation
“-‘: OPERATING SEQUENCE R-2380 : .; FUNCTION IMPORTANT ’ , ,’ FOREWORD ~., COMPONENTS This Manual has been prepared to provide Sharp Corp. Service Personnel with Operation Service Information SHARP MICROWAVE OVEN R-2380. “” :I ,;.,- ..;;; __ ;r TROUBLESHOOTING CHART _ ., =-...
Page 4 PRODUCT DESCRIPTION SPECIFICATION DESCRIPTION ITEM 240 Volts Power Requirements 50 Hertz Single phase, 3 wire earthed Microwave cooking 2.4 kW Approx. 10.0 A Power Consumption 1300 watts nominal of RF microwave energy (2 litter water load) Power Output Operating frequency of 2450MHz Outside Dimensions Width 510 mm Height 335 mm including foot...
Page 5: Appearance View
R -2380 GENERAL INFORMATION WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE: : EARTH GREEN-AND-YELLOW : NEUTRAL BLUE : LIVE BROWN APPEARANCE VIEW 1. Door handle. 2. Access cover for oven lamp replacement.
Page 6: Operating Sequence
OPERATING SEQUENCE When the cooking time is up, a signal tone is heard OFF CONDITION and the relays RY3+ RY4 go back to their home position. The circuits to the power transformers Closing the door activates all door interlock switches Tl + T2 are cut off.
Page 7 R-2380 MAGNETRON OPERATION SYSTEM Two magnetrons MGl + MG2 are equipped in order to get higher microwave power output. The primary windings of the power transformers Tl + T2 are connected so that each magnetron can be oscillated alternatively according to the frequency of the power supply.
Page 8 MICROWAVE VARIABLE COOKING When the microwave oven is preset for variable cooking power, the line voltage is supplied to the power transformers Tl + T2 intermittently within a 32 second time base through the contacts of the relays RY3+ RY4. The following levels of microwaves power are given.
Page 9: Function Of Important
FUNCTION OF IMPORTANT COMPONENTS UPPER LATCH SWITCH ASYMMETRIC RECTIFIER LOWER LATCH SWITCH The asymmetric rectifier is solid state device that pre- STOP SWITCH vents current flow is both directions. And it prevents + SW2 + SW4 temperature rise of the power transformer 1.
Page 10 -2380 DOOR OPEN MECHANISM BLOWER MOTOR The door release lever is pulled. The blower motor drives a blade which draws external The upper latch head is lifted up by the linked door cool air. This cool air is directed through the air vanes release lever.
Page 11: Counter Check
R-2380 Counter Check Procedure Order Display ;tep Touch START pad for 2 seconds. After 2 sec. an entry signal sounds. pi-j llyvllr*i. Touch CHECK pad for 2 seconds. (For 2 sec.) After 2 seconds. (Total times used) Touch NUMBER pad II.
Page 12: Resetting The Counter Memories
Resetting the counter memory When the counter memory is displayed on the readout (see page 9 Counter Check), the count can be reset to zero by touching the SELECTAPOWER pad for 2 seconds To reset memory 1 to zero. Procedure Order Display itep...
Page 13 One or two stage cooking can be programmed into any of the 10 programme positions. To programme the time and power level into a memory Suppose you wish to enter 4 minutes at 60% for a single quantity in the memory 1 itep Order Display...
Page 14 To change the time constant for double quantity The time constant for double quantity is preset 1.8 times the single quantity cooking time, but you can alter this constant to suit your needs. Suppose you wish to alter the time constant to 1.67 in memory 1. Order Display ;tep...
Page 15 R-2330 EXPRESS DEFROST To set te constants of Express Defrost to factory setting: 1st sequence: 20% of total time at 40% power. 2nd sequence: 30% of total time at 30% power. 3rd sequence: 50% of total time at 20% power. itep Procedure Order...
Page 16 EXPRESS DEFROST --_. . _--- __. ..- Order Display Procedure Step Touch NUMBER pad 141. LEEEEl p-x&--j Touch SELECTATIME pad. /r0-‘i3 Touch NUMBER pads a, 131. pzEq Touch SELECTATIME pad. Touch NUMBER pad 131. ISELECTAPOWER/ Touch SELECTAPOWER pad. p---ygq Touch NUMBER pad 131. Touch SELECTATIME pad.
Page 17: Servicing
3D checks lated screwdriver. re-examine the connections to the component ing tested. Sharp recommend that wherever possible fault-finding is carried out with the supply discon- nected. It may in, some...
Page 18 tu - NOTE: “C,” means direct cause and part. “A” means indirect cause and part. H.V. RECTIFIER ASSEMBLY WITH HVC HARNESS ASSEMBLY 5 !I I :: M LT 8 ii4 Z Lt. “, 5 rr’ PROBLEM does not appear in display but power supply cord is plugged...
Page 19 R-2380...
Page 20 66mm I-WUJI- LDZOWWD3CXW H.V. RECTIFIER ASSEMBLY WITH HVC HARNESS ASSEMBLY PROBLEM appears in display. 0000000000000 /EE] appears in display. appears in display. appears in display. Keys are touched but the programme can not be entered. Both oven lamp and blower motor do not work.
Page 21 R-2380 - -I L F’ 5 SZ ; -1 0” & 0’ 0’ E > &; z CT p : . 2 kc : s; 5: a1 l- - ? -/ > > > no00 or\nnoo 0000...
Page 22 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT Q CHECKS Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal.
Page 23: Test Procedure
TEST PROCEDURES (CONT’D) PROCEDURE LETTER COMPONENT TEST Example: Tl = 20X, T2 = 21 “C Initial temperature Tl = 10°C T2 = 11°C Temperature after 1 min. 52 sec. Tl = 20°C T2 = 21 “C Temperature difference Cold-Warm AT1 = 10°C AT2 = 10°C Mean temperature rise AT =(ATl...
Page 24 2380 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS. isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range.
Page 25 R-2380 TEST PROCEDURES (CONT’D) PROCEDURE LETTER COMPONENT TEST SWITCH TEST CARRY OUT 3D CHECKS. isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table. Table: Terminal Connection of Switch Plunger Operation...
Page 26 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER TEMPERATURE FUSE OR THERMAL CUT-OUT TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the temp. fuse or thermal cut-out. Then using an ohmmeter, make a continuity test across the each two terminals as described in the table below. CARRY OUT 4J CHECKS Table: TemDerature Fuse or Thermal Cut-out Test Temperature of...
Page 27 R-2380 TEST PROCEDURES (CONT’D) PROCEDURE LETTER COMPONENT TEST THERMISTOR TEST CARRY OUT 3D CHECKS Disconnect connector B from the CPU unit. Measure the resistance of the thermistor with ohmmeter. Connect the ohmmeter leads to the leads of the thermistor. 1 Resistance 1 Room Temp.
Page 28: Touch Control
!380 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
Page 29 R-2380 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER DC. voltage not indicated ..Check diode which is connected to the relay coil. If diode is good, control unit is defective. RELAY SYMBOL OPERATIONAL...
Page 30 TOUCH CONTROL PANEL ASSEMBLY: Outlines of Touch Control Panel Key unit The touch control section consists of the following units as The key unit is composed of a matrix circuit in which when shown in the touch control panel circuit. a key is touched, one of signals Pl 1 -PI...
Page 31 2. DESCRIPTION OF LSI AND K’S 2-l. LSI (ICI : IZA324DR) The I/O signals of the LSI (IZA324DR) are detailed in the following tables. VREF AVCC IZA324DR Figure T-l Relationship between pin Nos. and Signals (LSI: IZA324DR)
Page 32 q-2380 DESCRIPTION OF LSI LS I WA324DR) The l/O signal of the LSI (IZA324DR) is detailed in the following table. Pin No. Description Signal VREF Reference voltage input terminal. A reference voltage applied to the A/D converter in the LSI. Connected to GND.
Page 33 Pin No. Signal Description Terminal not used. Power supply output at thermistor detecting circuit. (Output - 5V in cooking only, but apply high impedance to others to prevent thermistor from electrolytic corrosion ocurrence.) Oven lamp and Fan motor driving signal (Square waveform: 50Hz).
Page 34 Pin No. Signal Description Signal synchronized with commercial power source frequency. This is the basic timing for all time processing of LSI. -r-u- *INo 20.0 msec. J---- L’L5V’ Terminal not used. CNVSS Connected to VC. (-5V) Auto-clear terminal. RESET Signal is input to reset the LSI to the initial state when power...
Page 35 Pin No. Signal Description I) Segment data signals. The relation between signals and indicators are as follows: Signal Segment Signal Segment PI7 ......LB PO7 .
Page 36 Pin No. Signal Description 1) Segment data signal. Signal similar to P17. 2) Key strobe signal. Signal applied to touch-key section. A pulse signal is input to RO - R3 terminal while one of G-7 line keys on key matrix is touched.
Page 37 Pin No. Signal Description Digit selection signal. Signal similar to P05. Terminal not used. Terminal not used. (Sound) Volume Level Control Terminal. This terminal (P-23) is to control volume level of buzzer sound with terminals, P22 and P21. Since the volume level of buzzer sound depends on voltage energized,...
Page 38 IViemory IC (IC3) 35C102 is a 2K-bit, serial memory, enabling CMOS to be erased/written electrically. This memo- ry is constructed with 128 registers X 16 bits, enab- ling individual access, read and write operations be performed. Details of input/output signal for IC3 are as shown in the following diagram.
Page 39 Description Pin No. Signal Serial data output: outputs data to IC 1. -GND 4oops Connected to VC. (- 5V). Connected to GND. Terminal not used. Connected to GND. 3 Magnetron Trouble-shooting Circuit HIGH VOLTAGE TRANSFORMER This is a circuit for detecting troubles of magnetron along with high voltage...
Page 40 SERVICING 1. Precautions for Handling Electronic Components On some models, the power supply cord between This unit used PMOS LSI in the integral part of the circuits. touch control panel and the oven proper is so short that they can’t be separated from each other.
Page 41 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow instructions below before operating the oven. Door does not close firmly. CARRY OUT 30 CHECKS. Make sure that a definite “click” can be heard when Door hinge, support or latch hook is damaged. the microwave oven door is unlatched.
Page 42 MAGNETRON REMOVAL 1. CARRY OUT 3D CHECKS. CAUTION: WHEN REPLACING THE MAGNETRON, 2. Carry out item 2 to item 16 of “POWER TRANS- SURE R.F. GASKET FORMER BLOWER MOTOR REMOVAL”. PLACE MAGNETRON Remove the four (4) screws holding the magnetron MOUNTING SCREWS ARE TIGHTENED...
Page 43 R-2380 OVEN LAMP SOCKET REMOVAL Own Iamp so&., CARRY OUT 3D CHECKS Remove the oven lamp. Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket Flat tyw small with the flat type small screw driver.
Page 44 UPPER LATCH SWITCH, LOWER LATCH SWITCH, MONITOR SWITCH, STOP SWITCH REMOVAL 1. CARRY OUT 3D CHECKS. ch hook 2. Remove the control panel from the oven cavity re- Switch spring ferring to “CONTROL PANEL REMOVAL”. 3. Remove the two (2) screws holding the latch hook /Switch lever to the oven cavity.
Page 45 UPPER LATCH SWITCH, LOWER LATCH SWITCH, STOP SWITCH MONITOR SWITCH ADJUSTMENT In case upper latch switch, lower latch, stop switch Door release and monitor switch do not operate properly due to a Latch head lever -..- mis-adjustment, the following adjustment should made.
Page 46 DOOR REPLACEMENT ADJUSTMENT CHOKE COVER REMOVAL DOOR REPLACEMENT 1. Insert an iron plate(thickness of about 0.5mm) CARRY OUT-Z CHECKS flat type screw driver to the gap between the choke Remove four (4) screws holding the upper and cover and door panel as shown figure to free the lower oven hinge to the oven cavity.
Page 47 DOOR COMPONENTS REMOVAL Remove the door assembly, referring to from item 1 KU;;;) LOWER LATCH HEADS through item 3 of “DOOR REPLACEMENT”. Remove the door release lever from the door as- Place the door assembly on a soft cloth with facing sembly.
Page 48: Microwave Measurement
MICROWAVE MEASUREMENT Recommended instruments are: After adjustment door latch switches, monitor NARDA 8100 switch and door are completed individually or collec- NARDA 8200 tively, the following leakage test must be performed HOLADAY HI 1500 with a survey instrument and it must be confirmed that SIMPSON 380M...
Page 49: Test Data At A Glance
TEST DATA AT A GLANCE Magnetron Filament winding < 1 R Filament winding chassis cc Q TEST POINTS ON CONTROL UNIT Resistance In/Out put terminal Test point Volt (Disconnect the power plug and door is closed) Input terminal (Power supply) Approx.
Page 50 E .- .= 0 ‘G b‘ B + > s 0 x0 “: :u 4m.t r z 9% 9 F6 w FY F9 2 OOQ ’ & i 2s -5 “0 &$$ 8% Be 32 LY B do z:: 2% s?!‘“”...
Page 52 s .L...
Page 53 R-2380 CONTROL Figure S-3. Printed Wiring Board...
Page 54 PARTS LIST Note : The voltage supplied to the parts r*n are greater than 250V. DESCRIPTION 1 cny [CODE REF. NO. PART ELECTRICAL PARTS DH-HZA006WRKOIThermistor assemblv l- 2 QACCAAO30WREO Power supply cord z QFSHDA002WREO Fuse holder l- 3 QSOCLAOllWREO Oven lamp socket l- 4 l- 5...
Page 55 R-2380 .,rr+n . TIT%3 \rrrl+~no c,,nnli,aA +n tlla nrlrt.2 “*” nlLlP+Dr +han 3ErT\/ .“LT I ,,r ““‘Luy’ ‘“f.spa’” L” 111u p2”‘W “I_ y’“uL” Lll”ll &““I. REF. NO. PART NO. DESCRIPTION 07-Y CODE C21,70, VCKYF31HF103Z Capacitor O.OlpF VCEAB31HW474M Capacitor 0.47pF VCEAB31HW225M Capacitor 2.2ccF_ 5ov...
Page 56 R-2380 ~r~l+~~~ cnnnnlicw-l tn tha nswtc “*” swo nrost~r than 7Wl\/ \I,-.*.3 “I” I’““L”..“ll ---.. .“LT I ,,.z vv,rcayr a”p~~~“Y L” Llll p,“‘LY DESCRIPTION O’TY REF. NO. PART CODI 4-10 LANGQA25lWRWO Noise filter angle LSTPPA048WRFO Cord anchorage (upper)
Page 57 R-2380 Note : The voltage supplied to the parts ‘I*” are greater than 250V. DESCRIPTION 1 Q’TY /CODE REF. NO. PART NO. MISCELLANEOUS 6- 1 TINSEA512WRRO Instruction book 6- 2 TLABHA019WRRO Memory sticker 6- 3 FW-VZA938WREO Switch harness 6- 4...
Page 58 R-2380 CABINET UNIT CHASSIS PARTS...
Page 59 CONTROL PANEL PARTS DOOR PARTS...
Page 60 PACKING MOUNTING PLATE LANGKA453WRPO DOOR PROTECTION SHEET %SPADP0336WREO DOOR PAD %SPADF0341 WREO \ TRAY HOLDER +SPADFA3lAWRFO PACKING CASE sSPAKCB520WREO +!+ --- Not Replacement Items PRINTING MATTER INSTRUCTION BOOK / ‘90 0 SHARP CORP. (5K0.62E) Printed in Australia...

Sharp R-2380 Service Manual

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