UTF-8에서 2단 카테고리를 사용하고 있는데요~

-----
if ($is_category) {
$nc_category_location = "./board.php?bo_table=$bo_table&sca=$sca&sfl=wr_10&stx=";
$nc_category_option = get_nc_category_option($bo_table, $sca);
-----

<? if ($is_category) { ?>
<form name="fcategory" method="get">
<td width="50%">
<select name=sca onchange="location='<?=$category_location?>'+encodeURI(this.value);">
<option value=''>전체</option>
<?=$category_option?>
</select>
<? if ($sca) { ?>
<select name=nca onchange="location='<?=$nc_category_location?>'+encodeURI(this.value)+'&nca='+encodeURI(this.value);">
<option value=''>전체</option>
<?=$nc_category_option?>
</select>
<? } ?>
</td>
</form>
<? } ?>
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UTF-8에서 1단계 [분류(<? if ($is_category) { ?>)]에서 카테고리를 선택했을때는아래처림 잘나오는데.
board.php?bo_table=EIRABA&sca=%EC%84%9C%EC%9A%B8%ED%8A%B9%EB%B3%84%EC%8B%9C

2단계 선택을 했을때는
(<?=$nc_category_location?>) 분류된 카테고리는 불러오지 못하고 에러가 나네요~
board.php?bo_table=test&sca=서울특별시&sfl=wr_10&stx=%ED%85%8C%EC%8A%A4%ED%8A%B8&nca=%ED%85%8C%EC%8A%A4%ED%8A%B8

select distinct wr_parent from g4_local_write_test where ca_name = '??울??별??sfl=wr_10' and ((INSTR(, '테스트')) ) and (wr_num between '' and '10000')

1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' '테스트')) ) and (wr_num between '' and '10000')' at line 1

error file : /test/bbs/board.php

해결할 방법이 있는지 도움을 부탁드립니다.