# Sharp Microwave

R

#### Ray Batig

Jan 1, 1970
0
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? Thanks in advance for your help and guidance. Ray Batig S #### Sam Goldwasser Jan 1, 1970 0 Ray Batig said: 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

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.

+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.

A

#### Art

Jan 1, 1970
0
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.

R

#### Ray Batig

Jan 1, 1970
0
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

R

#### Ray Batig

Jan 1, 1970
0
Greetings,

I finally got back to being in town and having enough time to do some in
depth troubleshooting. what I have found is that the flat ribbon cable, foil
ribbons, between the control circuit board and the LED display must be the
culprit. When I have the box open and the clock set, then set 8888 I get
Backward E backward C 1 on the left and nothing in the last spot. The flat
ribbon cable is in an inverted U. When I rub across the cable which flexes
it, the unlit segments of the 8888 light up and go off. This cable connects
to the landing spots on the circuit boards with no apparent solder
connections. Almost looks like a spot weld. Do either of you, or others
reading this message know how this connection is made? Can I strip off the
flat ribbon cable and solder fine wires in its place? Any other ideas?

Ray

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