Midea Kitchen Appliances M7017NX-Y Microwave Oven User Manual Print M7017service manual tif 18 pages
Guangdong Midea Kitchen Appliances Manufacturing Co.,Ltd. Microwave Oven Print M7017service manual tif 18 pages
Users Manual
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Glidea®
MODEL :M7017NX—Y
SEHWQHNQ MANUAL
PRECAUTIONS TO AVOID
POSSIBLE EXPOSURE TO EXCESSIVE
MICROWAVE ENERCiY
A. Do not attempt to operate this even with
the door open since open-door operation
can result in harmful exposure to microwave
energy. ll is important not to deieat or
tamper with the salely interlocks.
5. Do not place any obiect between
oven lront lace and the door or allow
soil or cleaner residue to accumulate on
sealing suriaces.
C. Do not operate the oven if it is damaged.
It is particularly imponanto that the oven door
close properly and that there is no damage to
the (1) Door (bent), (2) hinges and latches
(broken or loosened), (3) door seals and
seating surt'aces.
D. The oven should not be adjusted or repaired
by anyone except properly qualitieo‘ service
personnel.
SAVE THESE INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS '
When using electri appliances. basic satety
precautions should b: followed, including the lotlowing:
WARNING—To reduce the risk oi bums electrical
shock, fire, iniury to persons or exposur 0 excessive
microwave enemy:
'i. Fi’ “.D ALL-Ti .E lNSTr-iUCTIONS EEFORE USING
APPLIANCE,
l-‘teao nd follow the specific "Precautions to avoid
poss ole exposure to excessive mic:owave energy'
iound cbOVE.
—!
3.
iance must be grounded and properly
5. Connect only to a properly grounded and
polarized curiae Se. “Grounding Instrucz‘ons" on page 3.
. Install or locate t s app rice only in accordance
with the installation instructions descrioeo' in this
manual.
Some products such as whole eggs and sealed
containers, such as closed glass jars, may explode
and shouici not be heated in this oven.
. Use this appliance only tor its intended use as
Described in the manual. Do not use comsive
chemicals or vapors in this appliance. This type of
oven is specifically designed to h cook, dry, or
defrost iood. It is not designed ior industrial,
laboratory, or commercial use. it is intended for
home use only. Do not use tor drying clothes, linens,
newspaper, or similar non-tood type items.
. Make sure that all persons using this appliance, ‘
especially children, are closely supervised and
properiy instructed on how to use this appliance.
8. Do not one this aoplian it it has a damaged
cord or plug, is networking property, or it it has
been damaged or dropped.
its acolionce should be sen/iced only by qualified
oer-Vic- personnel. Contact the nearest authorized
r;
in
o)
xl
service Iacilily for examination, repair or replacement.
Do not attempt to service or repair this appliance.
10A Do not cover or block any openings on the
appliance. Do not store items on top oi microwave
oven ii' there are towers on top oi oven.
11. Do not store this a oiiance outdoors. Do not
use this product n ..r watcr—ior example, near
a kitchen sink, in a wet basement, or near a
swimming pool, and the like.
Do not immerse cord or plug in water
. Keep cord away from heated sun'ac
14. Do not let cord hang over edge oitabie or counter.
Ear—x)
15. When cleaning surfaces of door and even that
come together on closing the door, use only m
nonaiorasive soaps or detergents applied with a
sponge or soft Cloth.
16 To reduce the risk oi fire in the oven cavity:
a. Do not overcook iood. especially starchy
items such as potatoes and latty 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~ties trom paper or plastic
bag beiore placing bag in oven.
c. ll materials inside the oven should ignite, keep
even door closed. lum oven oh', and disconnect
the power cord, or shut oil power at the fuse or
circuit breaker panel.
d. Do not use me cavity lor storage purposes.
Do not leave paper products, cooking utensils,
or iood in the cavity when not in use.
a. Do not put metal inside the oven, except as
specifically described in the manual or
cookbook il supplied with this oven.
TABLE OF CONTENTS
clause contents page
00 Introduction and Safety precautions
1 Introduction 1
2 Safety Precautions 2
3 Exploded Views 3
4 Schematic Diagrams 4
5 Parts List 5
1.0 Heating Principle of Microwave 6
2.0 Troubleshooting Procedures 7
3.0 Common breakdown and means of repairing 12
4.0 Critical Parts Servicing 13
1 important things to do prior to critical parts servicing 13
2 interlock assembly replacement and adjustment 13
3 door and hinge replacement and adjustment 13
4 magnetron replace ment 13
5.0 Safety checks and tests after servicing 14
1 constructional checks 14
2 insulation resistance test 14
3 microwave leakage test 15
I TRODUCTION
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 leaf form will facilitate the 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 corner 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 pare should be taken to keep it up to
date by prompt and proper filling of subsequent pages as they are issued.
SAFETY PRECAUTIONS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID '
POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY:
A. 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 KNOWLEDGEAHLE 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.
..| .l
__|
EXPLODE VI EW
MODEL: M701 7NX—Y
PARTS LIST
MODEL M7017NX-Y
NO. DESCRIPTION QTY NO. DESCRIPTION QTY
1 Cabinet 1 29 Bottom plate 1
2 Lead-assy 1 30 Hook 1
3 Magnetron 1 31 Turntable motor I
4 Cavity thermostat 1 32 TT driver I
5 Fan Bracket 1 33 Lamp holder 1
6 Fan motor 1 34 Indicatorlight 1
7 Fan blade 1 35 Switch bracket 1
8 Fuse 1 3 6 Interlock switch 2
9 Delay Filter 1 37 Monitor switch 1
10 Screw 2 38 H.V. transformer 1
11 Screw 54? 3 39 Foot 2
12 Screw 3# 1 40 Capacitor clamp 1
13 Screw 94? 9 41 H.V. diode 1
14 TT-ring driver assembly 1 42 H.V. Capacitor 1
15 Tray 1 43 Lever (2) 1
16 Screw 6# 10 44 H.V wire 1
17 Mica plate 1 45 PET film I
18 Power supply cord 1 46 Knob 2
19 Oven cavity assembly 1 47 Key press button 1
20 Gasket I 48
21 Upper hinge 1 49
22 Door assembly 1 5 0
23 Glass 1 5 I
24 Door frame 1 5 2
25 Key press block 1 53
26 Control panel assenny 1 54
27 Lower hinge 1 55
28 Timer 1 5 6
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THE HEATING PRINCIPLE OF MICROWAVE
Microwave Is one lrind of radio wave whine wavelength is very short, treoueney is very high. ‘l'lteretnre, is called ultrahigh
iregueucy electromagnetic wavtr Microwave can heat food tnatniy result in the lmllual affect or the lood iu the microwave field
and the microwave rtel itsclt.
under the altect of microwave held. the thermal elteet mechanism produced from the mutual attect ot the microwave and the
food includes two aspects: tine it Dielectric loss or polm molecule. the otlter is conductive loss or ion.
Usually, loud is constitute uimganisnttplaul and auinutll. Tllc orgtnism is termed by all kinds of polar water molecule, polar
ntoleiu molecule. and all sorts nl salt ion. The center of gravity or the positive and negative charge lathe molecule is not eo'n-
title. in normal condition. tlte ltlttlctult: is in irregular luder due t ils thermal action, thus the land do not appear rtul ty.
lFlGJ — ht). Under tlte action or outer electric field. the ptis We end nl the polar molecule trettd tn the negative electric
field. the negative end or polar molecule trend to tire v ttive electrte field, and somewhat arrange in order through the direc-
tiou ot the electric ticldl FIUJ » In) 1 usually he called "TORQUE POLARI'I'Y". when the outer electric
field apply to. the oppos tc pnlarily. the polar tunlccule then arrange an opposite direction order accordinglyt FlG.l » 1h). It
the direetlon ot the outer clectr e ield changed repeatedly. the polar molecule wu tl repeatedly sway accordingly. During the
swaying, it is understanding that the polar molecule would produce treat due to router-that similar is tiou among them. When
s pltentnnemt
I ...
Mgfi omo
OQOg moo
”fir“—
+ (a) (b)
Fitz] “l
Ill: electric field is applied (at ultrahigh [rt-quail microwave Iicltl from till: outside. its ditcclion would change tells hilliml
limu per second. an tie the MOIECUIC. This kind uI nltlIccltlc swaying pmducing similar Irictilmal heal (mm the inlcrfcrtrlc:
rind ttlnelr or the action strength among the molecule. mltl‘cllangcd to mocxmctlpic t tcrnwave heating, icrowave lteatlng tutl
nttly concerned the nature or the matter itsell‘. but alsttcitls'edly connected willt the electric licltl strength anti lreqtlsucy. When
the frequency is low. the molecule swaying rate and the acute degree ot the mutual trictinu among the lllttleculc "3 low. and
would produce much heat. Wlteu the frequency is too high. as the swing or the polar molecule is with rotating inerti . tt made
lhe swing (In "(II in line "will the Chan lug rhylhm of [he cltcltil: field Mulls: rtf lllt: lticlinn drag. Illlls. aclnzIIy Irrwed the pn—
lar molecule swaying spud. the it on clinging degree is concerning ahoot the magoeleetric wave frequency. polar molecule
shape. and the matter's stlelty degree to different ntnttor's molecule. there are dirterent spt nl rrequeucy rune. those eltu
absorb microwave energy trout there zone are most ea lhln to tom n erotvnvc energy to heat energy.
Apart from Ille abuv: slit] atllon, lhgl’e is anttlhct aclitlll w
s electric ion under the action of microwave lield. act llercely
accompanied with the acceleration oi electric field. The pot e intt translcr to the negative polarity oi the field while the neg-
ative ion do npposile. Accompaning with the eh ng electric "(Ida the electric loo changing accordingly. During the IranSr
rcring. heat produced with (In: erash among the ion. This kind or action talte the main sheet to those tulerowave heating ol
high salt mnlecult.
Ne mutter lt hr the polar molecule swaying or the ion transtcriug. they both are turning the microwave energy which the heat-
ing ntntter got from the tnicrownve held to hcttt energy. Front the nualnttt of theory. we cl“ draw toelt a candid-inn that the
power which a unit or volume matter ahsorhecl trout llte tutctowave field as the tollowing lornula:
I': = x5 lattes
Pa stand: lor lhc power the heated matter absorbed hour the microwave field.
K stands for a unstant
E Stand tor microwave tteld strength
i Stands (or the microwave lrettncncy.
tats Stands for lots angle tangent oi the heated matter.
Er stand: lot relative dielectric constant at the heated tttatler.
TROUBLESHOOTING PROCEDURES
More werhalllln; a microwave oven. you abould judge the Muldwn and the eaten correctly. then you can repair it with
mtupoadtlt' W. a. The overhauling mint be proceed in older. any hasty conclusion It not recommendable, otherwln wef-
wnrfiln‘wntald he done when repair» The microwave liven may mill mapotmd hreakdtwm dlle to all kind! of dilierent
mama. thua. when overhaul. they all should be take into consideration. Special attention ll'lllll be given to the microwave
leakage and the electric Ituulatioa when examine bet-lire they may do illi't‘l‘lll to the repairing atatt.
i . MEANS OF THE BREAKDOWN EXAMINING.
How to cut-thre- uricnmve oven with breakdown? A better meana whlth «mutated in uremic-i oral-tin; are through
Ilupeeliu tntl listenlns. On the butt of Iarxe mounts or pereeptttal knowledge. you etu judge Ind erulysit the ilreah- ‘
down quickly and eeneeti.
' i. inspection .
inlpeet whether the well ahllpe is disordered and where is the disordered position. liany. it is normal ii the cabinet
dlawdeleti a little. but abnormal if the oven. the door disordered. the door hook broken. the door crooked. or there are
loo much iootenen between the door and tile oven after the door il cloud.
2, Litieninl.
Listening to the voice of the oven operating and the none oi the tan alter lt emdltctett Minor ”wen wen" noise. eyeiiu
“knit" naive and “thhhl” min should be consider a: normal. out it it mutt-mat it the following Mlle occured:
(1) Sound "welt wen" nolaet .
(1) Long tlllle “rhithl‘ nolre.
‘ (3) Strike voice like “pip-l plpa".
l . spar exammmo snaps or THE MlCROWAVE overt
I. Examine the microwave insulating rellatanee.
Manure the inllalating resistance with a avotlleter ora mgltlllmuleter the value should not lea: than 2 meg-ohm. 0th-
ervrlse. part ealninatiott should be taken at once. Such as checking whether the motorV the thermal cutout. the tram.
lurnter or the capacitor are electricity luklngt
2t Examination oi the rellataltce value oi the microwave oven.
Clote the door. wet the utueithc oven la at otter-ting eondition but the power plug havn't been plugged In), mealure
the two ieel (L- N) of the power plug with R x 1 grade oi a avornelcr. the resistance value should be about 2.5 ohm.
ii open circuit occured. than you mual cheek whether the BA (use I: broken. the primary winding of the transformer is
open circuit. tlle thernuti eutnut h open circuit or not. you mull check whether the interlock device It put lhmlllh or
all the plus are connected well. it siml circuit veer-red or the rfiiaiance lea: lllan it 5 ohm. you should check whether
the primary wlodlnl or the power transformer is short — circulteti or part short — ctrcuiicti.
3. Examination of microwave leakage.
Measure the microwave leakage with a miemwave leakage measure. Pince t moutte ni 275ml water at the middle or
the [Ian tray of the oven (Fills - 1,7 Close the door. power let higllt lime let lo 3 minutes, press the Starting button
to operate the oven. Alter rlmltltled the microwave leakage measure. measure around the door crack. those hole poll-
livll of the window and the air vent at [our sides of the oven with the probe oi the measure. when measuret the mlwing
We‘d oi the probe should not exceed ”mm per sewn-d, and the mersuring diretlloll should be the same with the outing
direction ofthe mlelovlave Icahn (FIG. 5 — 2).
when mealurlug. the ultimate value of microwave leakage of all the measured position thould not exceed 1 mllliwatt/
cm‘. or should be considered as abnormal.
4. Examine when the oven at operating. but the food Ean't be heated.
(l) Examine when the lamp It on. the glass tray ll cyclingv the villt operating in normal:
Take off the cabinet starting the overt. measure the plug of the transformer with a avomeler to lee whether it la e-
notllh to l20v. If it is enough to 110V. then the lecondary high voltage ol‘ the trantiormer should be examined as
FIGJ - 3.
route or tlu mat-me mom.
uetmiu, mu- ot the probe
FiG.S-2
hie-sure It with «he zsouv al«erna«ing grade ol model 500 ayomeler. One rod or the avorneier connec« «he iron can
ofllle llamfolmcr. the oiher rod connect ehc seeondary high voliage plug (1116.5 — 4), The avorneler reading
should be nbaul210th (when mensure, be careful wleh «he high vollage). If no voliage ni allr i« lndlca«er ehal «he
«ranriormer lus hroken, and should be repluced by a new one if i« is enough in now, «hen check «he lilamenl
yoliuge of «he «ransloriner wi«h allernaling 10V grade ol n avome«er. «he value should be aboui 3.4v (FlGr s - s).
Seemidary wlndlng
Primary whim!
Fig.5-3 Flg.5-4
FigJ—S FIg-S-6 . Fig.5~7
If «here Is no voltage u« all, le indicnies ehe «ranegormer has blokena and should be replaced by a new one. it l« is
enough (0 sew. check the lilamenc resistance or «he magnelron, measure «he filament plug with «he R x 1 grade
ol n avorne«er (Fla 5 - o). ll i« is open ~ cireuhed. i« indie-«es «he magneiron has broken, and should be replaced
by: new one l« is normal ll «he reaiuancc yalue Is very small. Then check whelher «he magnerron aieel has
broeken. ll broken, replace wl«h a new magnetronr
it «here is no problem wini «he magnenon. check «he high yoliage diode «hen. Meueure «he diode whh R x «ox
grade or . avome«er, «he " e " rod end or «he avomelzr conneci «he cmhode oi «he diode. «he “ — " rod end ul «he
ayomeler eonnecl «he anode ol «he diode (FlG.$ - 7). The ayome«er reading should be abou« 150 mot-sand ohma
Then change lhe rod in dillerenr elec«rode, «he readlng should be "en li «he reading is very small. And near «o
shun elreun, i« indium «he high yoliuge diode hns been punctured. and should be replneed by a new one.
seeond-ry whim
FigJ-B Fis~5'9
it the high voltage dltttle is OK. othen check the forwarding plug of the transformer to see whether it is enough to
I20v. it it is not enough, cheeir‘the mlcro- switch or the time and power distributer. Connect the two rod or the
avumetcr to the L1 place of thc timer with RK IK grade.“ is normal It the reading it "it"when at cut oil condi-
tionull tlle rcadit it indicates the micro svrltcll has broken. and the timer should be replaced by a new
one it all the shove examtna nm shows normal, then check whether the terminal plug or the magnetron and the ca-
paeitor have loosed. it it is loosed. pinch lt tlghtly with a pliers.
5. Examine the starting and the
Pullout the power plug, take all the cabinet. discharge the capacitor. measure the resistance value of the primary
winding and the secondary windlng of the transformer with a tvomeler (FlGJ - 10 and FlG.5 - 9). The resistance
value of the primary winding should be about It 2 ohm. the secondary winding should be about 130 ohm. otherwise. it
indicates the transformer has brokenv and should be replaced by a new one.
Tnntloetner
Primary wlrrdlrrg
Fig.S— ll Fig.5- 1: Figs- to
it the transformer is normal. then the hlgh voltage capacitor should be checked. Pull out the connecting plug of the ca»
pacltor. and measure it with R x I grade or a avometer, the two rod or the avometel‘ connect the two polarity or the ca-
pacitor. when they just connected, the reading of the avomcter should be zero. then enlarge to nine megaohm slowly.
Change the rod to dil‘lerent polarity, the reading repeat from zero to nine megaohm (FlG.5 — 11) t means the capaci-
tor is normal. it the indicator of the avometer can' t‘point out from zero to nine megaohm. it indicates the high voltage
capacitor has broken, and should be replaced by a new one,
ll it is normal between the two pole of the capacitor. then the insulation between the capacitor pole and the cabinet
should be measured with R X [0K grade of a avometerr The resistance value should be "co" (FlGr 5 - 11)t It It Is
short eircuited or have a number reading. it indicates that the capacitor has been punctured in electricity leelted. and
should be replaced by a same model. same capacity one
ll the resistance vttlue oi the capacitor's two pole are "6°". the capacitor is normal. Then check the earth or the mag-
netron's two filament to see whether they are short - circuited (FIG. 5 - 13)r If they are short " circulted and the lila-
merit strllres the shell or the magnetron, it indicates the magnetron has hroiten. and should he replaced try a new, same
model oner
If the magnetron is also normal. then test the pilot switch. Pull out the two plugs or the switch Measure it with the R
x 1 grade of I avonteter, the two rod connect the plug of the switch. the resistance value should be “n"(FlGJ) ~ 8) .
Then press down the pilot switch with a screwdriver. if the reading oi the avometer pointed to zero. it indicates the pi-
lot switeh has broken. and should replace it with a new. same model one.
in . REPAIRING METHOD OF SEVERAL BKEAKDOWN
1, Repair when there oecured large amounts microwave leakage. There are many factors which may cause microwave
leeliingt Following mentioned may be the main cause of microwave leakage:
(l) The door deformed, the hinge loosed or damaged Ihal caused the door can not close tightlyr
(2) The door pressing cover or the embed piece damaged or come on.
(3) Obvious damage or uneven oi the ovenr
(4) There are filth between the door and the oven.
(5) The door and the oven are serious loosed alter the door closed.
(6) The crack at the door shielding net cover.
Before repairing. check whether the above "start point are existed. if not. can you start the microwave oven. Place
a graduate of about 275ml water at the middle of the glass tray. close the door. time set It 3 mlnutes. power at
high. make the oven operating in normal. Recitity the nllcrowave leakage measure. measure the amount at the
microwave leakage around the oven with its probe. ll’ there are places which the leakage exceed the standard re-
quirement, tllen repair them accordingly. II“ the leakage amount exceed 1 rnillivlvatI/crnx at the left door crack.
then pull out the power plug, take down the cabinet. adjust the screwes of tile hinge(up and low) as figures - 14
to less the gap between the door and the oven. Then measure again. the leakage amount should less than I milli-
watt/cm’. Generally. it should he controlell below 0.75 mllliwatt/clnl with some allowance.
Door null-h. part at right Ame ._.
Dwr mm (up; U C7 Screw
Door
Door hinge (low)
om pushing pm at rum below L__
Flg.s— 14 Figs- 15
if the leakage occnred at the right door crack. adjust the screwes whlch ill the Interlock holder and the hook. [I
the leakage In on the larger side at the right — above of the oven. then adjust the upper screw as FlG.5 - ts.
Loosen out the screw. push the door close to the oven to hook the door hook with the pllstlc parts. then tlghten the
Screw again. if the leakage is larger at the right - below. then adjust the lower screw as FlG.$ - 15. Loosen the
screw. push the door close to the oven to hook the door hook wlth the swltch holder tightly. then tighten the screw
ugaln, and open and close the door reputedly to check whether the door can operate flexibly. whether the hook
and the switch are in thelr normal waltlmt If it. it not in position. then adjust the door hook and the switch holder
repeatedly to make them In the norm-I posltlvn. to out through the Interlocks, to cut oil the pilot switch, to less
the loose between the door and the oven, then measure the leakage wlth microwave leakage measure agahl.
ii the leakage still exceed standard requirement. then Inspect whelher the right oven ls even or not. it not. smooth
ll. Then adjust the door and the oven to elimlnlte their loose to the ultimate»
10
It“ there still exist miernwave lcaltagc. measure near the magnetron with the prohe oi the microwave leakage mea-
sure. it the leakage Is larger. the oven should be turned oil and check whether the tour serewr which ill the mag-
netmln have been loosed. ii‘ loosed. twist them tightly with socket wrench. lithe [our screws are fixedly. then the
magnetron should be take down to check the copper filament weaved washer oi the magetron has been placed well
or whether the wave guide housing coupling has been oxidized or have lacquer on it. if do have. scrape the oxi-
dlzed layer or the lacquer off. when fix the magnetron, the copper filament weaved washer must be placed well,
the screws must be twist tightly. Then turn on the oven amt measure again until it comply with tlve requirement.
If the microwave leakage is larger at. those hole position of the window board. the oven should be turned 0“ to in-
spect whether there are crack among them (fig. 5 — I7) . if several holes formed a creek . it would enlame the mi-
crowave leakage. ii that is the case, it Indicates the door has broken. and should be replaced with a new door.
1. Means of repair when the oven can heat, but the turntable gt-rs can't move
Firstly. eheelt whether the turntable holder is placed correctly, it it is correct. then pull out the power plug and take
down the turntable combination, measure the resistance value oi the turntable motor with R X 1K grade ol'a avometer.
if it Is open — eircuited. it indicates the turntable motor halt broken. and should be replaced by a new. some model
one, if the resistance value is between 15 - 12K. it indicates the turntable motor is normal. then check the connecting
shalt weave. lithe plastics which the shalt Insert In has broken. a new shall weave should replace it. v
3. Repair when the oven can heat. but the lamp is not on.
Pull out the power plug. take down the cabinet and discharge the capacitor.
Pull out the two terminal plugs or the lamp, measure the two plugs or the lamp with the R x 100 grade or a avometer.
if it is open“ circuited. it indicates the lamp has broken. and should be replaced by a same model one.
tmttaen
thts- 16 Fig.5- 17
4. Means of repair when the oven atop working arrer aeveral mlnutea operatan
The phenomenon indicates the thermal cutout In playing lta protective role, and you should check whether the tan is
working in normal. Turn on the oven . pull out the power plug. take down the cabinet. discharge the capacitor . then
turn the fan with hand to see whether It Is moving flexibly. it not. it indicates that the oil bearing of the fan motor has
nln oil the oil, and should take down the tan combinatlom to repair the motor. Loosen the two screws which ii: the
bearing out the shaft lull the bearing. and rinse them with kerosene (ATFENTION: The bearing an only be wiped
with a silk which moistened with kerosene rather than be washed in the kerosene because there are felt on it. it the ielt
are soaked with kerosene. then the engine oil can not be sutked up. ). After the bearing being cleaned. the felt should
be refilled illlly with engine oil (for when the oven is operating. the engine ‘ empty into the oil bearing slowly). Fix
the hearing cover with two screws. turn the inn aroturd till it can move flexibly. Then install them to the oven. and
plug in the two terminal plugs.
if the fan can move flexibly. then the winding of the fan motor should be examined. Measure the winding with R X 100
grade of a avorneter. it it is open - clrcultcd. it indicates the winding oi the fan motor has broken. and should be re-
placed by a new. same model one.
11
COMMON BREAKDOWN AND MEANS OF REPAIRING
PHENOMENON
CAUSE
REPAIRING MEANS —|
i. When starting the oven. the
lamp is not on, the turntable
tray can't rotate and the toot!
can't be hutetl
. fuse broken.
. The primary and secondary winding of the
transformer are short ~ circuited.
. The earthing or the polarity of the capacitor
is punctured.
. The pilot switch can't cut off.
. The interlock switch haven't closed.
The power plug and the socket are not in
good connection.
The door hook broken.
N—
stow-at-
Change a new fuse.
Change a new transformer.
Change at new capacitor.
. Change a new pilot switch.
. Change a new interlock
switch.
Adjust the connection or
replace it by a new one.
7. Change a new hook.
utth—
.°‘
2. When startlng lhe oven. the
lamp is on. the turntahle rotat-
ing. the fan cycling hut the food
can‘t be heated.
. The food can be heated. but the
lamp I: not on
. The food can be heated hut the
turntable tray is not rotating.
5. The five“ can hell within 2 _. 3
minutes, but can not heat from
the fourth mInules
6. When starting the oven. it can't
heat. and with "wenwen" noise.
7. The even can heat. but wllh
sound “shishl” noise
8. Large amount of microwave
leakage
9. The door can'topen
i. The primary and secondary winding. tlte ril-
ament ot the transformer are open — circuit-
ed.
2. The magnetron filament is open — circuited,
the magnetic steel of the magnelrtm broken
or the magnetron r leeklng.
3. Time and power distriooter broken.
4. The plugs of the magnetron or the capacitor
loosed.
The lamp broken.
1. The plug iali o“.
l. Change a new transformer.
1. Change the magnetron.
3. Change the time power dls-
lrllwler or the mlero- swllchi
. Fix them.
. Change a new lamp
2. insert the plug again
. The turntable motor broken
. The plug fall oft
. Connecting shaft weave hrtrlten
1. Change the turntable motor
2. inrert the plug securely
3. Change the wane
I. The wlnding of (he fan motor In open — cir-
cuited.
. The fan falls oft
3. The plug of the fan motor falls off
4. The turnatahlc shaft is griped with the inn.
tor hearin
s. The cooling vent blocked
Change the (In motor
change the tan
Insert the plug
Overhauling them
Repairing it
meta-r..-
The high voltage diode was punctured
Change a new diode
The Iron ewe ol the transformer loosed
Change a new lrnnsl‘oflner
i. The door deformed
2. The door metal net cracked '
3. The gap of the door crack is too large
4. The welding point or the oven fall off
5. The screws which rot the magnetron loosed
o. The wave guide connection oxidized.
7. The magnetron copper filament washer is too
thin cause the wave guide opening not in
good earth.
. After long time using. the wear and the rnst
- eaten enlarged the gap of the door shaft
and the shaft hole. thus cause the door
crooked.
2. The door hook hroken.
It Mend Ihe door
1. Change the door
3. Adjust the gap
4. Change the oven
5. Tighten the
s. Scrape the ox
Ihe xcrews
7. Thick the copper filament
washer
led and tighten
1. Adjust the hinge to reetliy the
position of the door.
2. Change the hook.
I0. The door release bullon fall all
it. Electricity leaking
"I—
Weared and aged alter long time operating
The enllhlng insulation reslstunez of all the
motors or the trastormer are lees than 2
megaohm.
12
Overhaul It or renew it '
Test where is the leaking place.
then repair it or change those
damaged components.
CRlTICAL PARTS SERVICING
1 IMPORTANT 11-31le TO DO PNDR TQ CRITICAL PARTS SERVICKNQ
"the following illslfllziiflns are CRITICAL lo Ute owner‘s safety . Be sure to l'uilmv all the instrumigu cam“: um
nunut'acrure: or distributor it'you have any question
ll’ the arm is apatite prior tn servicing. a Mimwnve Luk-le Tct (1L; Mimwave Ezisign
Cheek) should be painted prior to servicing the oven. Rule: to Seedvn 7a. Min-vw-ue Lahge Ttst. for
the detailed ehck procedure.
in the event that any n-u'mmve ovct found In have mimuhre minim: level in ates: at": mw/flfl. The
(allowing procailtrr: should be lollowefi
1 Infant: the dism'mtmr. import: or minimum: the finding Rand it in the logbook a: well.
b. Rqair the unit at no that to the own:
e htvmignte the oval and axe-um the cut: of the ezcssi we lakztge.
1 Hold the oven in your theiiiq and ins-ate: the invite: not to use the unit untii the own hx
been "might into compliance
in the even that the av: 09:45 with the tioer open. file following pmcfinru should he follomrei'
a. Teil the uscnot ta opczte the over.
b. Hold the me: in year facility until it is instigated and regnirei
e. Contact the Emmi-lean: and CDRl-l (FDA) immen'iate
2 interlock Assembly Replat=tmt anti Mimezt
If)“ sue-pee: d "it primary. scandal-1 or monitnr hue-Eves; switehst use your (INCL-(04:41:51 or
analog (3pm to can»: the eieezrld cuntimtity.
Make sure the pew: avid is pulled out and the hip'i-withge epithet is discharge—i before the elf-trial
continuity £15k.
Set the ahmet: In ‘Low Rs'tmnee‘ mge and ennn .: both lads (zlligntar clips) to the SWitd't
nemv‘mls
0pm the door mdlnon'c: the mu: r=dlh.-, The primary or scandary ihtciodt svvitL‘i should show an
“infinite“ m5: «hm the door is open. Regine: it witc: it is defeeeive. The monitor intcloc'x should
shown “1:9 one: 2:0" resistance win: the danr is open. What the door is closed. the milling: Will be
appetite.
[l' the ova has he: x==d===l invpc’ative due tn the failure ot' Ute monitor-ft w'ety (wrimqry anti/ut-
' scandal-y) int-rims), you should replace all of the minimal stately intz'toei: switchrs and the monitor
switch.
Refer to Chaim: 4. Seetims land it tbr how to rznovc and assemble the interiodc and monitor swimhm.
Always ' tn Stain-10.4 l'ur adequate Winn; diagnm. Munitor interlock must always be insmt‘d.
Repczt Step 6.24 to duck e‘eeu-tcl continuity.
Perform minim-d vibe-"5:5 and Isis us IiL‘SCiiJI—‘J in Clluplur
eic‘sing the oven lo the owmz.
13
3 Door and Hing: Replacement uni Adjusmmtit
11
u.
u.
3.4
Pull the powe: cord from the outlet Cited: the timer for waive-l or damaged arcs. Chfik the Mn: for
broken or «am anzm Cited: tithe: art-z sud-t as tracked l'mxtl. glass. broken door Interns. “11m! marked
viewing sch-en and etc.
Alter determining the door ambly shwuld be minced. Cilfik the parts [kl fur the comm pan numb: All
oven door mponcus musl be art-lad direrJy from me manm'antm or its authorized dim-ibutar.
Refer to Chapter -‘. Satin: l. [L and ill for how to disassemble asemble and adjust the door and/or
hinge.
Perform minim! ehezk's and Isl: a 651:in in Clmpv: 7 before relaxing the evm In the mm:
4 Magnetron Regiment
4.1
.l.
Ref: 147 Chum: 1. sczion IV for rcnoving and replacing the menu. Click for the grace. of the
wire rush wit: before installation.
Perform mird (hf-33 and us: as alsci‘od ixi Chapter 7 before 35min! the oval to the ewe.
Cann‘ucu' Mictmm'e Lckzgg Tattllef: ta Seeuon 7.5) at the magnetron era prior to Mailing the my
tbvti
SAFETY CHECKS AND TESTS AFTER SERVICING
C unstructional Chunk:
[l‘ me:!tanir:.l or eleezrinl (demonic) parts have beta 12;th be sure lo follow the following star.
1.1
Cheek fur entree: wiring, adequate nit-martial sentiments ot'pans. and tirm tsunami;
Che-k for adrqtnte grinding,
Cheek the following items before mmin; the oven ON.
1) Pmpedoordosingsnudwkemficamdhinges.
Z) No whine. damage
a) qupc interlock end monitor (mentions. (Refe- to Steps 6.1.1 to 6.14.)
Insulation Rsisunc: Tat
lfth: law vol g: pow: supply has be=1 retain". m a 500 V Megaoitnunetzm mm: the rah—ran: bezwm the
primary (Line and Nana-an oi" the ;o\vc ping and operator mini: metal parts. The misuse: shuuld be no less
than 2 Mzga Ohms. Rewir the over again when mm.
14
Mimwave Linkage Test
Inthe
'ml that mgtemn. door. or hing: has "a: rqiaeec'. or mtijustei rt mimwave tat-t as foilows must be
prefeerm':
3.)
PI
Id
is
3.10
Test itummtctts muirei‘
Mimmve Stu-wry: Meter, Enladay MOO'L’ l-II~l7l0 or equinlezt
600 ml ginss bez'xe:
Precautions:
J‘m the your: otl'(or unplug the ova) immu‘hteiy if the ova his this test;
Plug the own pow: and into the pew: melt
Turn on the MCO\\1VC Leeitnge Maze: and warm up for at test 10 minutes. Se: the mezr regions: (Git:-
selection) at “FAST. '
Fill the gas: best: with 275 (4+ 15't ml ol‘coid up watt: tutti place the bake: in the cat: of the
turntable gins plate. ‘ ‘
Close the oven door, Set the timc‘ at “5 minus". Se: the Power Level at " GK“ or ‘100 7." met start the
operation
Hold (by the handle mtrttmt) the probe (cone spacer) pmctdiwlu to the are: under tut (of RF emtssions
Move the ;roix at a ape-d ot'no (ash: than 1 inch per second. The arm nude; tm are
n The eintmttkrctce of the door/cavity ml.
2) The era ot‘the door scent.
3) flte ara ot‘comml panel.
4) The era mezr line card.
5) All vent openings.
6) All chine: sums.
7) Other stnpm arm
At several loctions in the Vicinity ot'ceit high leakage point. hold the probe stationary until a steady state
value is mchett‘ on the Sun's! Meter. Glue-v: the maximmtt labge at aah loun'on.
Se: the Met: [ta-polls: to ‘SLOW" : mot-sure the lakag: at the point ot'm‘dmum lnitnge located in
Step 7.3.8 abo'te reeord the value and location of the maximum lqmge ammo-coat with the meta
mouse on "SLOW“.
flte maximum RF emission fl=tlzgei should be 4‘0 mW/mtz or lets. ll'noL instigate and man": the oven
again until it passe: the lat.
15
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