shunde Md Microwave Oven E8528P-B Microwave Oven User Manual Users manual
shunde Md Microwave Oven Manufactory Co., ltd. Microwave Oven Users manual
Users manual
INSTRU~TIONS
SAFETY
MPORTANT
service facilily for examina~on, repair or replacement.
Do not attempt to service or repc.ir this appliance.
10. Do not cover or block any openings on the
appliance. Do not store items on top of microwave
oven ii there are louvers on top of oven.
11. Do not store this appiiance outdoors. Do not
usa this product near water-for example, near
a kitchen sink, in G wet basement, or near a
swimming pool, and the like.
i 2. Do not immerse cord or plug in water.
i 3. Keep cord away from heated surfaces..
14. 00 not Jet cord hang over edge of table or counter.
15. When cleanina surlaces of door and oven that
come togethe; on dosing the door, use only miid,
nonabrasive soaps or detergents applied with a
sponge or soft cloth.
16. To reduce the risk oj fire in the oven cavity:
a. Do not overcook food. espe~ially starc.~y
items such as potatoes and fatty items such
as bacon. Carefully attend appliance ii paper,
plastic, or other combustible materials are
.placed inside the oven to facilitate cooking.
b. Remove wire twist.Ues from paper or plastic
bag before placing bag in oven.
c. If materials inside the oven should ignite, keep
oven door closed, turn oven oft, and disconnecl
the power cord, or shut off power at the fuse or
cirC'uit breaker panel.
d. Do not use the cavity for storage purposes.
Do nolleave paper products: cooking ulensils,
or food in Ihe cavily when not in use.
e. 00 nol put metal inside the oven, except as
spe~ifica"y descnbed In the manual or
cookbook if supplied \vith this oven.
When using electrical appliances. basic safety
precautions should be follo"/ed. incluo1ng the following:
VvARNING- To reduce the risk of bums. electrical
shock. firs. injury iO persons or exposure to excessive
mic:-ow2ve energy:
,. READ ALL. THE INSTRUCTIONS SEFORE USING
THE APPLIANCE:.
2. Read and iollow the specific "?rero...autions to avoid
possible exposure to excessive mic.-owave energy"
found above.
3. Tnis appliance must be grounded and properly
polarized. Connect only to a propeliy grounded and
p::>iarize-:i ouUsl Sse -G(ouncing Ins\rlJC:jons- on page 3.
4. Install or locate this appiiance only in ac:ordance
v/ith the installation instructions described in this
manual.
5. Some products such as ,,/hole eggs and sealed
containers, such as closed glass jars. may explode
and shouid not be heated in this oven.
6. Vse this appliance only for its intended use as
described in the manual. 00 not use corrosive
chemicals or vapors in this appliance. This type of
oven is specifically designed to heat, C:IOk, dry, or
defrost food. It is not desioned for industrial,
laboratory, or commercial-use. It is intended for
home use only. Do not use for drying ctothes,linens.
newspaper. or similar non-load type items.
7. Make sure thaI all persons using this appliance, '
especially chiidren, are closely supervised and
properly instructed on how to use this appliance.
I 8. Do not operate this appliance ij it h2S a damaged
c:>rd or plug. ii i: is nOI working propeny, or if it has
been oamagcd Or oropped.
9. This appliance should be serviced onl)' by qualified
zervic~ per:oonne!. Conlac; the nearest authoriz,erJ
A. Do not attempllo operate this oven with C. Do not operate the oven if it is damaged.
the door open since open-door operation It is par1icularly impor1an~that the oven door
can result in harmful exposure to microwave close properly and that there is no damage to
energy. It is important nol to deieat or the (1) Door (bent), (2) hinges and latches
tamper "vilh lhe safely interlocks. (broken or loosened), (3) door scals and
i . sealing surfaces.
i 8. Do nol place any obJecl belween
oven front face and the door or allow D. The oven should not be adjusted or repaired
soil or cleaner residue to accumulate on by anyone except properly qualified serVice
sealing suriaces. personnel.
TABLE OF CONTENTS
Introduction and Safety precautions
00
1
2
3
4
5
1
2
3
4
5
I ntrod uction
Safety Precautions
Exploded Views
Schematic Diag rams
Parts List
1.0 Heating Principle of Microwave 6
Trou bleshooting Proced ures
2.0 7
Common breakdown and means of repairing
3.0 12
Critical Parts Servicing 13
important things to do prior to critical parts servicing
interlock assembly replacement and adjustment
door and hinge replacement and adjustment
magnetron replace ment
13
13
13
13
1
2
3
4
14
Safety checks and tests after servicing
5.0
1
2
3
14
14
15
constructional checks
insulation resistance test
microwave leakage test
This Microwave Oven Service Manual is printed in a loose leaf format. Each part is
divided into sections relating to a general group of components and each section is
subdivided into various parts describing a particular component or service procedure.
The subdividing of the subject matter plus the loose leaffonn Will facilitate Ute updating
of the manual as new or revised components and service procedures are introduced.
Each page of this service manual will be identified in the lower right hand comer and as
new or revised pages are published it will be easy to keep the manual up to date by
following the filing instructions on the cover letter.
This Service Manual is a valuable service tool and .care should be taken to keep it up to
date by prompt and proper filling of subsequent pages as they are issued.
SAFETY PRECAUTIONS
!PRECAUTIO,NS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID
IPOSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY:
IA. Do not operate or allow the oven to be operated with the door open.
B. Make the following safety checks on all ovens to be serviced before activating
the magnetron or other microwave source, and make repairs as necessary.
( 1 ) Interlock operation
( 2.) Proper door closing
(3) Seal and sealing surfaces (arcing, wear, and other damage ).
4) Damage to or loosening of hinges and latches.
( 5) Evidence of dropping or abuse.
C. Before turning on microwave power for any service test or inspection within
the microwave generating compartments, check the magnetron, wave guide
or transmission line, and cavity for proper alignment, integrity, and connections.
D. Any defective or misadjusted 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.
F. Operate the oven from a properly grounded AC outlet capable of supplying 120
volts at 15 amperes.
THIS MANUAl, AS WELL AS THE INFORMATION CONTAINED IN IT, IS TO BE USED ONLY BY
AN AUTHORIZED SERVICE TECHNICIAN FAMILIAR WITH AND KNOWLEDGEABLE OF
;
PROPER SAFETY AND SERVICING PROCEDURES AND POSSESSING HIGH QUALITY TEST
EQUIPMENT ASSOCIATED WITH MICROWAVE AND ELECTRICAL APPLIANCE REPAIR.
ALL INDIVIDUALS WHO ATTEMPT REPAIRS BY IMPROPER MEANS OR ADJUSTMENT,
SUBJECT THEMSELVES AND OTHERS TO THE RISK OF SERIOUS OR FATAL INJURY.
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THE HEATING PRINCIPLE OF MICROWAVE
Microwave Is one kind of radio wave wlKlSe wavelenctll is very shurt. frequency is very hiBh. Therefore. It Is called ultrahi~h
frequency electromagnetic waye. Microwave can hcat fc)()(1 mainly result in the Inutual afrect or the rood in the microwave field
and the microwave field itself.
under the .ffect of microwave field. the tl\C~.1 effect mechanism produced from tile mutual affect or the microwave and the
f~ Includes two aspects: One is Dielectric loss or (lCllar molecule. the olher is clJOducti.e Ius.. or ion.
Usually. f~ is constitute of fH"~anisnl( plant and aninlall. The QfJ:inism is foroled by all kinds of poiar ~ater 111OIecule, polar
protein molecule, and all S()rts of salt ioll. Tile centcr uf i=rayity or Ibe positive and neptiye charge in the molecule is not coin-
cide. In normal condition. the tn~cculc Is in irrCl~llar IN"der due to its thermal action, thlls the (ood do not appear JX)larily.
(r:IG.l - la). Undcr thc actiOtI or outcr clectric ficld. the (lClSitive end or the lJ()Iar molecule trrnd to the negative electric
field, tbe negativc end or ~1ar Itloleculc trend to the pusitive clcctric field. and sonlcwhat arraDle In order througl' the dlrec-
tim or the electric field( FJ(j.1 - Ic). l"Ilis phenolneCtfl11 usually be called MTORQUE POLARITY". WllCn the. outcr elcctri~
rield apply for tile op~itc polarity, thc polar D,olecule Illcn arrange an OI)po5ile dircclion ()r"dcr accordlnlly( FIG. J -Ib). If
Ille direction of the outer electric field changed ref)Catcclly. the polar molec"le WCKlld ref)Caledly sway accordingly. During the
swa,iRl, it is undentalKllIIg Ihnt the pular muleculC! ,vlII)ld prUl.luce heat due to Sllnle~hat similar fricliun .0.00& Ihem. When
- 1+
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II -(ct~
-J (b)
Fi~J - I
, lhe electric field is applied ror ultrahigh rrcquent lulcruwave neld rrom tile outside. its direction would change tens hilUm1
times per second. so do the mol~ule. This kind of nllllccuic ~waylng producing: sinlilar frictiooal heat fnJRI the interfercncc
Qnd block of the action slrenst" anionS the molecule, and,changed to mocrnscopic nalcmw.ve heating. Microwave heating nfJt
unly concerned thc nature or the nlatter itselr. but Dls" ck1SCdly connected with thc clcctric field strength and rrequency. Whcn
Che rrequency Is low, thc nKJlecule swaying rate and the acute degree or lhe mutual fricl!lln am~ the n1O1«ute is low, and
wwld pnMiu~c much heat. When tile frequency is too Iligh. 115 thc swin, or tl1e pular looleculc is with rotaCing inertia. it made
the swinK do not in line wiCIJ the changin~ ..h,lhol or lhc: electric field because or tate frlciiUt", drag. thus. actually lowed lile po-
lar molecule swaying spced. l"he frictiOfI d.-aging delle\: L, concerning abouC the magnelectric wave frequency. (MJlar molecule
shape, and tile matter' s sti~ky degree, To dirfcrentJJlaCICr' s nloleculc. there are dlfferenC .cpecial rrcquency zone, Those aho
absorb microwave enctgy rrom tlle.~e zone are nwst callable to tum microwave ener~y to heat energy-
Apart from the above said acCjon. there Is another actiun which is electric ion under tbe action of microwave field. act nercely
accocnpanied with the aeccleration of electric field. Tllc positive iOfI transfer to the negative pJlarity or the field while the 11eg-
ati~e Ion do opposite, Accompaninl with tile clt8nBln~ electric field. the electric Ion chaRging accordingly. During the trans.
fcrlnl. beat produced with tile crash anM1ng the ion. Thi5 kind of actiwa take the nlain erfcct to Ihose mlcrowaye heating of
high lalt molecule.
No matter It II the pol.r molecule Iw8ylnl or the loa ttansfering. they bot It are turninl the microwave encrJY whicb the Kat.
ina ...atter lOt frOln the IIllCfOWllye neld to heat ene~y. I":ronl the analasl- of thellrY, we e8n draw .uch 8 cuncluaion th8t the
power which a 'Init of volume nlatte.. absorbed from tile Inicrowave field a.~ the followiol foftlula:
Pa - KE fErt~a
Pa'Stands for the power tile heated matter absorbed fr(M.. tile loicrowave field.
K St_. for a canstant
E Staad fcw microwave field strength
r Stands for the ml~rvwaYe frequency.
la~ ~f.ftd. 1- r_- ___I. -, ~L- L__&_.J --,.--~