Question about Lexmark Lemark E352DN Laser Printer

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Door open after power up

Checked interlock with oam meter seams to be OK

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Hope you clean the lens properly and put it back appropriately. Check switch and door if it is making good contact with the actuating switch. - epson t060120

Posted on Sep 22, 2011

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I have a microwave hood combo - kenmore. the power goes out when i open the door or closes it, then it comes back on -


Hi and welcome to FixYa, I am Kelly.
You have a bad door interlock switch or bent switch actuation arm. Should someone open the door while the microwave is operating without pressing pause/stop when the unit has this symptom will cause the internal fuse to blow and it will not operate until the fuse is replaced. The switches are inexpensive but takes someone with some reasonable mechanical skills and knowledge of using a meter to isolate which of the 3 door interlock switches is causing the problem.
Thanks for choosing FixYa,
Kelly

Mar 02, 2011 | Kenmore Microwave Ovens

1 Answer

Sharp microwave carousel R330J 1100 watt. When the heating cycle is started the microwave light flickers on and off and there is a clicking sound. Initially high voltage fuse blown. replaced fuse and...


Hi and welcome to FixYa. I am Kelly.

1st the model number appears to be incomplete. Not an issue at this point but will be if you need parts.

You most likely have an interlock problem with one of the 2 door switches or the door interlock mechanism is broken.
There are 3 safety interlock micro switches activated by the door. One for the light, one for the Magnetron and one for the control panel power. If the problem persists with the Magnetron disconnected. The Magnetron safety interlock micro switch is supposed to blow the fuse if the unit is energized with the door open. Check continuity of your door interlocks. Pat particular attention to the NC (normally closed), C (Common) and NO (Normally Open) contacts.
NC should read to C and when the switch is activated read open at which time the NO contact will read to C.

I really suspect a bad microswitch.

Thanks for choosing FixYa.

Kelly

Aug 21, 2010 | Vacuums

1 Answer

Washing machine won't switch on , changed fuse and checked power.


assuming fuse and power both ok could be off/on switch or door interlock if indicators say power ok

Apr 03, 2010 | Whirlpool Duet GHW9150P Front Load Washer

1 Answer

No poer to fridge


there are interlock switches located throughout the unit for safety reasons...power goes through the interlocks...one or more of them is open...each one must be checked and /or replaced would be a better idea

Aug 15, 2009 | Hotpoint RLA30 Compact Refrigerator

1 Answer

Do you test your commercial microwaves for leakage? What standards do you comply with as far as allowable leakage?


As per a similar manual:

1. Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

2. Safety interlock switches: Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at any point 5cm or more from
the external surface of the oven.

You need to be sure that if the meter comes with a styrofoam cone tip, that should be installed or it will give high readings.

Also, the meter should be calibrated periodically, typically annually.

If the meter gets dropped or bumped, that may throw it out of alignment.

The most common causes of excessive leakage are loose or misaligned door switch mounts or hinges and physical damage to the chassis of the oven.

The most common cause of the misalignment of door switch mounts is slamming the door.

I would be sure my meter is set up and calibrated, then I would be sure my door switch mounts are aligned & tightened properly.

From a similar manual:

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor. If the door sensing switch, secondary interlock switch and monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

4. Loosen the two (2) screws holding latch hook to the oven cavity front flange.

5. With door closed, adjust latch hook by moving it back and forth, and up and down. In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch and secondary interlock switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed.

6. Secure the screws with washers firmly.

7. Check the operation of all switches. If each switch has not activated with the door closed, loosen screw and adjust the latch hook position.

After adjustment, check the following.

1. In and out play of door remains less than 0.5mm when in the
latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm.

2. The door sensing switch and secondary interlock switch interrupt the circuit before the door can be opened.

3. Monitor switch contacts close when door is opened.

4. Re-install outer case and check for microwave leakage around
door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Please write back with more details if you need further help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Aug 12, 2008 | Sharp Microwave Ovens

2 Answers

Whirlpool Electric Range - Setting Timer Stove says door


It may be that the door interlock is faulty.

It will not turn on if it thinks the door is open. It will probably work fine if in manual mode - as this is not used.

If out of warranty, check the door interlock for anything broken off, and with a meter to ensure correct operation.

If this is ok, check cabling back to controller. This board may need repair/ replacement if faulty.

Jun 11, 2008 | Whirlpool RF378LXKS Electric Kitchen Range

3 Answers

JMC7000ADW Blows circuit breaker


I've had this problem twice with our microwave. The hint to where the problem lies is that the breaker blows when you open the door at times. Inside the microwave are three microswitches; primary and secondary interlock micro switches and an Interlock Monitor switch. The switches are supposed to shut down the microwave if it is running and the door is opened. But, I've found the upper primary switch can stick internal at times and when the door is opened the stuck switch will, because of the way it is wired as a safety switch, cause either the fuse or possibly the main circuit breaker for the oven to pop. The reason the stuck switch blows the breaker or fuse is when the door is opened the interlock switch will cause the neutral wire from the AC power to be applied to the Upper Primary Interlock switch which normally should be open when the door is opened, but if the switch is intermittent or the contacts weld themselves shut the neutral line is connected direct to the "hot" side of the power line through the fuse and thermostat. The first time my microwave failed the switch had melted the contacts together inside the switch and the second time the switch became intermittent and would blow the breaker to the over ever so often. I suspected the switch the second time this happened and utilizing an ohm meter I checked the switch several times by opening and closing the door and once in a while it would remain closed instead of opening when the door was opened. Of course while trouble shooting the power cord to the microwave must be disconnected and use all safety precautions when working around the high voltage areas inside the microwave. I wrote Jenn-Air about the bad switch and the way it is wired into the circuit, but never received any acknowledgement. I suspect these microswitches are under rated for the amount of current that passes through the switch, thus they overheat and eventually arc the contacts together. I hope this helps explain the intermittent problem and could explain many of the intermittent blown fuse problems I see in these internet help sessions

May 09, 2008 | Jenn-Air JMC7000 Microwave Oven

1 Answer

Door interlock switch


the door interlock switches are safety switches so the washers stops when the door is open if bypassed and the door is open could be a mess and damage floor so let your mind be your guide its not recommend by factories who are damage minded hope this helps but it wold work i mean if such a condition existed the washer would run

Jan 10, 2008 | Dishwashers

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