It seems this has been happening over the last few years. I am a retired appliance tech. My 1870 also started the 59 second routine, Also in a motor home. Pure logic. Had to be the board. New board same results. So now I need to run down a parts manual and possibly service manual, and get the damper switch and motor refered to in earlier posts. Changing out the board was fairly simple. Dropping the unit to change out the other components sounds like it will be a tad bit more difficult.
SOURCE: My Sharp micro will stay on for 59 seconds and
This
is not a problem on the board, it is a problem in one of the damper-related components, either the switch
or motor or the damper door may be binding.
The
damper is a door inside that opens or closes depending on cooking mode.
If the controller senses that the door is not in the right position, it
will shut down the cook cycle.
Sharp models stop after
59 seconds.
See the attached sample
drawing for a typical damper assembly.
We have the applicable
service manuals for these models and have uploaded them to our site here and here.
If a switch is all you
need, we offer a universal type for only $5 postpaid which you can
order here.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Our sharp 957 will now
This
is a problem in one of the damper-related components, most likely the
switch, but it may also be the motor or the damper door.
This is also likely why your convection mode stopped working.
The
damper is a door inside that opens or closes depending on cooking mode.
If the controller senses that the door is not in the right position, it
will shut down the cook cycle.
Sharp models stop after 59 seconds.
See the attached sample photo for a typical damper assembly.
Info on ordering Sharp UK parts / spares is here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer. 
SOURCE: Sharp R-1874 shuts off after 59 seconds
I had the same problem. Turned out to be the micro switch and damper motor. I replaced both myself and fixed the problem for less than $40.00. The best advice I got was replace the switch, reconnect the motor and make sure the motor runs through a damper door cycle. It didn't run, even though it showed continuity and had power, so I replaced the motor which solved the problem. The micro switch which is activated by the cam on the damper motor has to be cycled within one minute, or the unit shuts itself off. The damper motor on my model R-1870 is found in the right rear section of the assembly when facing it. You have to remove the unit, and remove the outer casing to get to it. The damper is a simple sheet metal door, activated by the motor, and the switch mounts at the top of the motor and is activated by the same cam that activates the door.
SOURCE: Sharp model R-1870 Carosel quits cooking at 59 seconds
This
is a problem in one of the damper-related components, most likely the
switch, but it may also be the motor or the damper door.
The
damper is a door inside that opens or closes depending on cooking mode.
If the controller senses that the door is not in the right position, it
will shut down the cook cycle.
Sharp models stop after
59 seconds.
See the attached sample
photo for a typical damper assembly.
We have the applicable
service manuals for these models and have uploaded it to our site here and here to help you. You will
need the free
Adobe Reader
to view or print it.
If a switch is all you
need, we offer a universal type for only $5 postpaid which you can
order here.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Sharp R-1870 stops at 59 seconds
Wow. I just read something ridiculous!
Well, never mind that, here's your solution:
This
is a common problem in one of the damper-related components, most likely the
switch, but it may also be the motor or the damper door.
The
damper is a door inside that opens or closes depending on cooking mode.
If the controller senses that the door is not in the right position, it
will shut down the cook cycle.
Sharp models stop after
59 seconds.
See the attached sample
photo for a typical damper assembly.
We have the applicable
service manuals for these models and have uploaded it to our site here and here to help you. You will
need the free
Adobe Reader
to view or print it.
If a switch is all you
need, we offer a universal type for only $5 postpaid which you can
order here.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
809 views
Usually answered in minutes!
I bought a Sharp Microwave Oven with Sensor, Grill and Convention functions, R-967(SL)M, a few years ago in London, United Kingdom. Problem: Now, each time the timer counts down to 1 second (for example, 1 sec. or 2 mins. 1 sec. or XX mins 1 sec.), the heating function just stop as long as the timer shows 1 second. In addition, I relocated to Hong Kong and the local Sharp customer service refused to provide any repair service (even if paying!) since I did not buy the product model in Hong Kong! The warranty period has ended, hence there is not an issue with warranty service. Appreciate if any expert(s) out there could kindly provide assistance or at least offer a direction/suggestion which I could pursue to get the appliance back to working again. Thank you!
×