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The protect mode indicates that a problem was detected in the final stage of amplification and the unit has shutdown to prevent further damage. These units use an AMP-pac part number: VHISTK40270N1 which is available at tritronicsinc.com for $53.09 plus shipping.
The output amp section for your system is not designed to run more than the speakers that come with it. By adding more, you presented too low an impedence load to the amp and overheated it. This occurred too quickly for the internal protection circuits to kick in to prevent damage to the outputs. This unit will now require that the outputs be replaced. These are not the easiest units to work on, so I would not suggest that you attempt this repair yourself. Expect a parts cost in the $35 range for this repair.
You have a blown amplifier IC in the stereo that must be replaced, that is what causes the protect error on the display. It is a good idea to take it to a repair center and have them do it if you are willing to spend about $125 to $150, depending on the rates of the shop, to have it repaired. Otherwise, you will just need to get a new one. There is no other way to fix this problem without replacing the amp IC.
Sorry for the bad news, I wish I could have given you an easy fix, but there just isn't one for this problem.
It shows "protect" because the amp IC is blown. You would need to replace it or take it to a repair center and have them do it. The repair cost is normally from $125 to $150, depending on the rates of the shop. If you do not have really good soldering skills and know how to dis-assemble and re-assemble these type of units, you really should just take it in for service.
As Shown Here, A Sharp-Associated Repair Person Suggested Replacing A Specific Output IC, As Well As Two Other Small Components. The Total Of The Three Replacement Parts Is $55.43. I Suggest Doing The Repair Yourself, As The Stereo Would Be No Longer In Warranty, Unless You Have No Experience With Working With Electronics. You Could Also Get The Repair Done By Circuit City, Best Buy, Or A Similar Electronc Consulting Business