[TechAssist] Re: More help needed -GE JVM140H Range hood Spacemaker 1400 No heat.
- From: "majorthom@xxxxxxxxxxxxx" <majorthom@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 3 Jul 2004 10:04:58 -0700 (PDT)
Hi Roger-Before I go on the GE answer center # is 18006262000 and the place to
get complete schema is 18006262002. Can you remove all HIv by pulling off the
wire at the xfmr tap and energize cook fcn then check the 3VAC filament
presence ? That done I have used a HiV probe in reverse to check the HiV.Now
this can be DANGEROUS-I clip the normal HIV ground to the HiV at the diode or
maggie then ground the tip of the probe then get the heck away while I observe
the meter's slight rise when in cook mode.If your probe pointer is zeroed
properly,you can see the slight rise when HiV is present in cook mode.Of course
after this test,short out your cap to relieve the stored charge.To me,all a
working maggie needs is the fil,the HiV, and a magnetic cavity to sustain uwave
oscillations.Does this help-Hope you have a happy and SAFE 4th of
July..............Regards,
Pete
hivolts <hivolts@xxxxxxxxxxxxxxxx> wrote:
I have also seen the hv diode cause the same thing the ones I have seen the
diode ck's good but was bad and I had no heat
Chuck Staples
Staples TV
Phippsburg Maine 04562
hivotls@xxxxxxxxxxxxxxxx
----- Original Message -----
From:
To:
Sent: Saturday, July 03, 2004 8:53 AM
Subject: [TechAssist] Re: More help needed -GE JVM140H Range hood Spacemaker
1400 No heat.
> Roger,
>
> You said you changed the three microswitches. I think you said the
> symptom changed when you did that. I can't help but wonder if I wired it
> wrong, or used an N.O. switch in place of an N.C. contact switch. Most
> of those microwaves came with a wiring diagram. Sound like you need to
> find one.
>
> Good luck.
>
>
> Ken Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL 32563
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
>
> On Sat, 03 Jul 2004 00:20:39 -0400 Roger G
> writes:
> > Hi Pete-
> > To answer your questions -
> > I am getting Hi voltage when I connect the Xformer to 110v so all
> > HiV
> > components are OK.
> > Filament winding is on main Xformer.
> > The front ckt bd has 5 small relays, one medium sized and one large
> > one.
> > The relays are marked for function - like Vent- On/Off; Light -
> > bright;
> > light night etc. This is an over the range unit with light and vent.
> > One relay (small) is marked Main and this is the one that clicks
> > when
> > Microwave Start button is pressed.
> > All the small relays are the same so I swapped out the Main with
> > another -
> > no better.
> >
> > This is what happens -
> > Set time cook - hit Start. Unit starts up but no heat.
> > If I open the door, fan stops, light comes on BUT timer keeps
> > counting
> > down !!
> > If I close the door, power starts up without having to hit START
> > - still
> > no heat.
> > If the door is open when the time runs out, a relay clicks.
> > If the door is closed, beeper beeps and shows END.
> >
> > As mentioned, timer keeps running down even when door is opened.
> > START
> > button is also the PAUSE button.
> > Tried hitting the Start/Pause button during cycle - relay would
> > click and
> > timer would stop.
> > 99% sure it is NOT a microswitch interlock.
> > The coil of the Main relay goes thru some transistors which I figure
> > are
> > controlled by the microprocessor. The Xistors are marked C815-Y and
> > R1005.
> > I can swap the R1005 with another on the board but C815 is the only
> > one.
> > The C815-y crosses to a NTE289A.
> > The R1005 crosses to
> > NTE Device Number: NTE5404
> > SCR-200 VRM,0.8A,TO-92.
> >
> > Now if the SCR is locking up, wouldn't this keep the relay
> > activated??
> >
> > The only other thing I can figure is that the CPU is not getting the
> > signal
> > to open the relay and pause the timer when the door is opened.
> >
> > Thanx for your time
> > Roger
> > > > Mr. Fix-It
> > > > Harrisburg, PA 17110 WebSite- http://mrfixit.netfirms.com
> > > > rogerfixit@xxxxxxxx
> > > > FAX 510-740-3641; Tel: 717-763-7098 (shop) 717-652-1703(home)
> > At 01:03 AM 7/2/2004, you wrote:
> >
> > >Hi Roger-Can you use a variac and go on the primary of HiV Xfmr?
> > Start low
> > >and measure HiV tap to see what's what.Are you not getting HiV ?
> > can you
> > >brief me again on what's going on w/microwave.Is the filament
> > supply part
> > >of the xfmr? Some GE's like the JVM series I just finished use a
> > separate
> > >fil. xfmr.Certailly we should be able to dope this
> > out...........Regards,
> > >Pete
> > >Roger G wrote:
> > >Alignment is good - Ck'd continuity using door itself.
> > >Also ck'd high voltage side by putting 110v to transformer.
> > >BTW, did not see any secondary high voltage tap from transformer as
> > mentioned.
> > >Will go over ckt bd with magnifier - sounding more and more like
> > micro [?]
> > >Roger G.
> > >
> > >Mr. Fix-It
> > >Harrisburg, PA 17110 WebSite- http://mrfixit.netfirms.com
> > >rogerfixit@xxxxxxxx
> > >FAX 510-740-3641; Tel: 717-763-7098 (shop) 717-652-1703(home)
> > >
> > >At 10:18 PM 6/29/2004, you wrote:
> > >
> > > >Did you check the alignment of the switches? Check for bad solder
> > on the
> > > >control board.
> > > >Al Marquardt
> > > >Subject: [TechAssist] Re: More help needed -GE JVM140H Range hood
> > Spacemaker
> > > >1400 No heat.
> >
> >
> > Subbed all micro switches - no better - actually, now acting
> > weirdly.
> >
> >
> >
> > All ideas appreciated
> >
> >
> > Did check and looked ok but I have it on a table - he uses it
> > hanging on
> > the wall so it is possible that the door alignment could be off -
> > except -
> > he said he took it home and tried it on the table without
> > hanging it.
> > Maybe something happened in transit.
> > I usually run these and move the door up and down to assure
> > alignment.
> > Roger G.
> >
> > > > >
> > >
> > > > >
> > > > > At 11:09 PM 6/18/2004, you wrote:
> > > > >
> > > > > >Even though the switches check good how does the alignment
> > look?
> > > > > >Al Marquardt
> > > > > >ampm@xxxxxxx
> > > > > >Al Marquardt Electronic Repair
> > > > > >206 W Main
> > > > > >Girardville Pa. 17935
> > > > > >----- Original Message -----
> > > > > >From: "Roger G"
> > > > > >To:
> > > > > >Cc: ;
> > > > > >Sent: Friday, June 18, 2004 5:05 PM
> > > > > >Subject: [TechAssist] GE JVM140H Range hood Spacemaker 1400
> > No heat.
> > > > > >
> > > > > >
> > > > > > > REgarding the comments on the Sharp Microwave on
> > TechAssist,
> > > > > > > Just did a GE with VERY intermittent heating. Resoldered
> > the ckt
> > > bd as
> > > > > > > suggested.
> > > > > > > It worked every time for me - even before I soldered the
> > bd- and
> > > >always
> > > > > >after.
> > > > > > > Custy took it home - said it does not work.
> > > > > > > I had checked the micro switches-- chk'd OK.
> > > > > > > Have you found a similar problem with these GE microwaves?
> > > > > > > The connectors looked clean - not like the ones where the
> > grease gets
> > > >into
> > > > > > > them and turns them brown
> > > > > > >
> > >
> > >
> > >
> > >
> >
> >
> >
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Peter Neal
Neal Electronics
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