Thanks to you both. I will try to see if there is something loose. Sure
sounds like it since things cleared up when I hauled it back to the shop. I
find it hard to believe that Sharp is using such cheap but over priced parts
that you can't take the microwave to the shop without the controls failing.
I will keep you posted on what I find.

Ray

Art wrote in message
...
The Sharp Microwaves have had a lot of failures with the
display-controller
devices used in both their tabletop and under counter models. Only way to
repair them is to replace the complete controler as a unit.
"Sam Goldwasser" wrote in message
...
"Ray Batig" writes:

Greetings,

I have a Sharp Microwave R-530BS (now R-530ES). The magnetron went
bad.
I
took it in fort service and paid for labor since the magnetron was
under
warranty. I brought the unit home and plugged it in. The next morning
the
clock display was missing a lot of segments. I called the repair place
and
was told to unplug for 10 minutes and try again. It didn't help, even
waiting 8 hours. I dragged it back to them, and everything was fine.
Returned home and the next morning display was messed up again. The
repair
guy says this happens a lot to them and they test for 4 hours. He said
$100
would buy a new part.

I looked inside and see that there is a flat ribbon cable between the
circuit board and the display. The ribbon cable is kinked. Could this
be
where the problem is or is there a real need to change out the parts?

I see that there are actually 3 parts to this control. First there is
the
power circuit board. This holds the relays etc. Number on it is Sharp
FB030MR KPC-M-PP ... other side says QKITPB030MRE0. The second part is
the
control circuit board. It holds the clock circuitry and touch panel
circuitry. Number on it is Sharp FA585DR...Lot No. 0074 B031MR. Last
there
is the display itself. The relay board is connected to the circuit
control
board by a flat ribbon cable (obvious round semi-flexible wires)
soldered at
both ends. The circuit control board is again connected to the display
by a
flat ribbon cable ( obvious flat wires or foil) connection to boards
is
through some other method than soldering. Does anyone know if I can
just
replace the circuit control board and display Vs the total three part
assembly? Does anyone have a working circuit control board and display
for
sale?

The bottom line is that you didn't have this problem before you had
the magnetron replaced. Coincidences are unlikely.

Have you checked for bad solder connections, reseated any plubbable
cables,
etc.?

If the display is an LCD, there may be "zebra stripe" connectors linking
it to the PCB. These get dirty.

--- sam | Sci.Electronics.Repair FAQ Home Page:
http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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