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Sharp R-7370 Service Manual
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Sharp R-7370 Service Manual

Sharp R-7370 Service Manual

Microwave oven
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Download this manual See also: Operating Manual
R-7370
SHARF=
SERVICE MANUAL
S6606R737OJ//
MICROWAVE
OVEN
MODEL
R-7370
photo R-7370
In
the
interests
of user-safety
the
set should
be restored
to
its
original
condition
and only *parts
identical
to those
specified
be
used.
/--
\
This is a supplemental
Service Manual
for R-7370.
These models are quite similar to Base Model
R-7260.
Model
R-7370
has Reheat Sensor and Compu
Defrost
functions
in addition,
compared
to base
model
R-7260.
Use this supplemental
manual together
with the Base Service Manual.
Refer to the Base Service Manual
for complete
operation,
service information,
etc.
/
TABLE
OF CONTENTS
\
Page
FOREWORD
......................................................................
1
CAUTION,
MICROWAVE
RADIATION
...................................................
1
THUMB
INDEX
...................................................................
1
PRODUCT
DESCRIPTION
............................................................
2
OPERATING
INSTRUCTIONS
.........................................................
3
SERVICING
......................................................................
8
TOUCH
CONTROL
PANEL
ASSEMBLY
.................................................
10
MICROWAVE
MEASUREMENT
.......................................................
23
SCHEMATIC
DIAGRAM
............................................................
24
PICTORIAL
DIAGRAM
.............................................................
24
CONTROL
PANEL
CIRCUIT..
.......................................................
25
PRINTED
WIRING
BOARD
..........................................................
26
PACKING
AND
ACCESSORIES..
.....................................................
27
PARTS
LIST
....................................................................
28
SHARP CORPORATION

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Summary of Contents for Sharp R-7370

  • Page 1 R-7370 SHARF= SERVICE MANUAL S6606R737OJ// MICROWAVE OVEN R-7370 MODEL photo R-7370 interests of user-safety set should be restored original condition and only *parts identical to those specified used. This is a supplemental Service Manual for R-7370. These models are quite similar to Base Model R-7260.
  • Page 2 Sharp Service Personnel with complete Operation and Service Information for the Sharp Microwave Oven. These models are quite similar to Base Model R-7260. lt is recommended that service personnel carefully study the entire text of two Manuals...
  • Page 3 PRODUCT DESCRIPTION EXPLANATION OF MICROWAVE COOKING Materials with a high moisture content, like most foods, will The Sharp Microwave Oven uses microwave energy to produce As the microwave energy at a fre- absorb microwave energy. heat in the food to be cooked.
  • Page 4 HlGcl or tncrease 1 m,nure by 1 minute mumpies durmg varmie cookmg omx>u DefrostTM / Your Sharp Microwave Oven has special function keys to defrost meats and poultry faster and better. Compu Defrost automatically defrosts roast beef, pork, steaks,...
  • Page 5 !]and ISTRR:] will Open the door. Turn steak over and shield be displayed repeatedly. any warm portions. Return food to the oven. Close the door. !TETTl jEU”=li’] will Repeat step 4. be displayed repeatedly. and i 5 T,q&‘Tj jFRESSI Reheat step 5.
  • Page 6 R-7370 Compu DefrostTM Chart Compu Defrost Pood Comment Procedure Display Amount Setting r ii r-7 T1 I Stand, covered Before defrosting.. Minced I- CJ LJ JJ / 10 - 15 minutes. Remove any thawed r*n \,,-, beef ICE - 1 I 1-l Y c pieces after each stage.
  • Page 7 REHEAT SENSOR REHEAT SENSOR WORKS Sharp’s Electronic Sensory Processor is a semi-conductor device that detects the vapor (humidity) emit- ted from food as it heats. The Sensor adjusts heating times and variable power for various foods and quan- tities. It takes the guesswork out of microwave heating.
  • Page 8 R-7370 To Use Reheat Sensor To use the Reheat Sensor, open oven door, place food in oven, close door and touch REHEAT SENSOR pad. REHEAT SENSOR pad must be touched within one minute after closing oven door or touching STOP/CLEAR pad.
  • Page 9 R-7370 SERVICING TROUBLESHOOTING GUIDE Note: For other Test Procedures, please refer to Service Manual for Base Model R-7260 etc. TEST PROCEDURE PROBLEM POSSIBLE CAUSE CORRECTION SENSOR COOKING Oven is in the sensor cooking con- RH sensor open and/or short. Procedure...
  • Page 10 R-7370 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER REHEAT SENSOR CIRCUIT Water Load Cooking Test Check as follows: Fill milliliters (3.6 oz) of tap water initially at 20 + 1 OC (68°F) in a 500 milliliter measuring cup. Place the container...
  • Page 11 R-7370 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL touch control section consists of the following units as 1) Power Source Circuit shown in the block diagram. This circuit generates voltage necessary in the control Key unit and indicator circuit, from the AC line voltage.
  • Page 12 R-7370...
  • Page 14 R-7370 Description Pin No. Signal Segment data signals The relation between signals and segments are as follows: Segme Signal ....j; H;);H : Gw ......* ..*... ‘r-d COOK i AUTO 1: s.....
  • Page 15 R-7370 Description Signal Kev strobe signal. Signal applied to touch-key section. P13 terminal while one of G-3 line keys on key matrix A pulse signal is input to PlO touched. Key strobe signal. Signal applied to touch-key section. P13 terminal...
  • Page 16 R-7370 Pin No. Description Signal RH sensor input. This input is an analog input terminal from the RH sensor circuit, and connected to the A/D converter built into the LSI. Terminal to change the functions according to the Model. By using the A/D...
  • Page 17 R-7370 Description Signal Pin No. ‘Oven Iamp cooling fan motor and turn table motor driving signal (Square waveform: 50Hz). To turn on and off the shut-off relay (F$Y I) : Square waveform voltage (50Hz) is delivered driving circuit control circuit.
  • Page 18 R-7370 Description Pin No. Signal Input signal which communicates the door open/close information to LSI. “H” level signal (OV) Door closed: “L” level signal (-12V) Door opened: Segment data signals. Signal similar to P30. ) Connected to GND. POWER SOURCE CIRCUIT...
  • Page 19 R-7370 SYNCHRONIZING S IGNAL CIRCUIT to PA1 terminal of LSI. This voltage is referred to as a power secondary side of the power source circuit there sync. signal. caused AC half-wave rectified voltage and it is applied via R7 >...
  • Page 20 R-7370 BUZZER CIRCUIT (2.5 square waveform developed from T terminal of LSI waveform voltage kHz) is applied to SPl to generate buzzer sound. applied to the base of Q30 to turn on and off Q30, and square u-uzv I- -------l (From LSL) Dp~~~“-T-;;y~;...
  • Page 21 R-7370 REHEAT SENSOR CIRCUIT 1. Operational Principle of Reheat Sensor 2. Reheat Sensor Circuit As shown in Fig. T-8,2 pieces of temperature sensitive resis- This circuit is composed of a part which transmits a change of the reheat sensor voltage to PO0 terminal...
  • Page 22 R-7370 CIRCUIT INDICATOR 13segments Method of Display In this model, the Fluorescent Display 6-digits, Indicator element is Fluorescent Display. are used for displaying figures. Basically, a Fluorescent Display is a triode having a cathode, a grid and an anode. Usually,...
  • Page 23 R -7370 SERVICING On some models, the power supply cord between 1. Precautions for Handling Electronic Components touch control panel and the oven proper is so short that This unit uses PMOS LSI in the integral part of the circuits. they can’t be separated...
  • Page 24 MICROWAVE MEASUREMENT Recommended instruments are: After the adjustment of the latch switches and door is com- NARDA 8100 pleted individually or collectively, the following leakage test NARDA 8200 must be performed with a survey instrument and it must be confirmed that result meets...
  • Page 25 R-7370 0’ CI N’ ( I , 11 T-1 ~ Jm I,“:1 B .- cn” 5 .-...
  • Page 26 R-7370 I / 1 l!lIlllI !I// P +tttY !=m.--?I “8 2 ; ---------1 jI// 3” m .- till’ ’ ] I / 1 1 1 I I$, IIT I -q-q, ’ .% I ‘, ncn?
  • Page 27 R-7370 <Tl 7.;P .-I* _cI - “, ^ * , q-J I”%- &- .&W,.L Figure S-4. Printed Wiring Board...
  • Page 28 R-7370 PACKING AND ACCESSORIES PACKING ADD KIT TURNTABLE’TRAY EORfPROTECTION ; .S (BPADPQOO5YBEO) 0 WADBWBBYBEO) If (SPAKCA233WREO) * Not Replaceable Items...
  • Page 29 R-7370 PARTS LIST Q’TY DESCRIPTION CODE PART NO. REF.NO. ELECTRICAL PARTS l- 1 Mains supply cord 1 QACCAA 0 0 7WR E 0 l- 2 FDTCTAO 2 3WRK0 RH sensor-. FuseM6.3A ,QFS-C0019WREO l- 4 QFSHDOO 19WREO Fuse holder (115°C) l- 5 QFS-T0026WREO Temp.
  • Page 30 R-7370 Q’TY 1 CODE DESCRIPTION PART NO. REF.NO. CONTROL PANEL PARTS CPWB F 2 0 7 SWR K 0 Control unit QPLGJ2381YAZZ 4-pinconnector 3- 1B QPLGJ2255YAZZ 3-pin connector(B) QPLGJ2362YAZZ 3-pinconnector QPLGJ2335YAZZ 4-pinconnector __--- E,.- QPLGJ2299YAZZ‘ i$nconnector(F) 12-pin connector(G) QPLGJ 2YAZZ ’...
  • Page 31 R-7370 Q’TY CODE DESCRIPTION REF.NO. PART NO. 27Oa VRS-FT3AB27 Resistor 1/5w 82Oa Resistor VRD-ST2DF 82OQ VRS-FT3AB8 Resistor R7,R8 VRD-ST2DF473 Resistor 47kn 1/5w 1/5w 1Okn Resistor R20,R21 VRD-ST2DF 10 3 J 1/5w Resistor 3.3ka R30,R40 VRD-ST 2 DF 3 3 2 J...
  • Page 32 R-7370 Q’TY CODE DESCRIPTION REF.NO. PART NO. Clip 4-13 PCLiC0026WREO 4-14 Steam duct PDUC-A020WRFO PDUC-0501WRP0 Air duct 4-15 Oven lamp holder 4-16 LHLD-0048WRF0 PSPAY0017WRPO Thermo-spacer 4-17 4-18 PCUSUO189YBPO Shading cushion 4-19 Magnetron cushion PCUSU0506WRPO 4-20 PC@iPA051WRFO Sensor cover DOOR PARTS C Db R F A 0 8 8 WR K 0 ’...
  • Page 33 R-7370 Q’TY j CODE DESCRIPTION REF.NO. PART NO. 7- 2 I L X-BZ 0 1 8 6WR E 0 Screw ; rectifier, capacitor holder, earth wire (for control unit), transformer (for control unit), monitor resistor and turntable motor cover 7- 3 j LX-BZ0194WREO Screw;...
  • Page 34 R-7370 CONTROL PANEL PARTS / 1. I ‘, /’ ’ I / ’ /’ b @P \‘\ -1’:;:...
  • Page 35 R-7370 CABINET, UNIT CHASSIS AND OVEN PARTS d--q _________ - __---------- :--.w* CYyp /’ ‘\ ,’ 1’ ,’ ,I’ ‘\\\ ,’ ’ @!?,,yyv r--L---- -‘\, {F\ -J$-.--~ c5- \$ ,i’Q / ,’ z-3 A?ix+&Lz y’ H ed ’ A...
  • Page 36 R-7370 DOOR PARTS MISCELLANEOUS (6-lJl 11.5$...
  • Page 37 R-7370...
  • Page 38 R-7370...
  • Page 39 R-7370 SHARP ‘86 0 SHARP CORP. (6N0.8E) Printed in Japan...