diff --git a/contrib/japanese/gdev10v.c b/contrib/japanese/gdev10v.c
index 5c8b7fb..53da0ec 100644
--- a/contrib/japanese/gdev10v.c
+++ b/contrib/japanese/gdev10v.c
@@ -73,8 +73,20 @@ gx_device_procs prn_bj10v_procs =
   prn_matrix_procs(gdev_prn_open, bj10v_get_initial_matrix,
     gdev_prn_output_page, gdev_prn_close);
 #endif
+
+static int
+bj10v_open(gx_device * pdev)
+{
+    if (pdev->HWResolution[0] < 180 ||
+        pdev->HWResolution[1] < 180)
+    {
+        emprintf(pdev->memory, "device requires a resolution of at least 180dpi\n");
+        return_error(gs_error_rangecheck);
+    }
+    return gdev_prn_open(pdev);
+}
 gx_device_procs prn_bj10v_procs =
-  prn_procs(gdev_prn_open, gdev_prn_output_page, gdev_prn_close);
+  prn_procs(bj10v_open, gdev_prn_output_page, gdev_prn_close);
 
 gx_device_printer gs_bj10v_device =
   prn_device(prn_bj10v_procs, "bj10v",
diff --git a/contrib/japanese/gdevalps.c b/contrib/japanese/gdevalps.c
index f29aeb1..d4de619 100644
--- a/contrib/japanese/gdevalps.c
+++ b/contrib/japanese/gdevalps.c
@@ -155,13 +155,20 @@ static const char end_md[] = {
 static int
 md_open(gx_device *pdev)
 {
-        static const float md_margins[4] =
-         {	MD_SIDE_MARGIN, MD_BOTTOM_MARGIN,
-                MD_SIDE_MARGIN, MD_TOP_MARGIN
-         };
-
-        gx_device_set_margins(pdev, md_margins, true);
-        return gdev_prn_open(pdev);
+  static const float md_margins[4] =
+    {
+        MD_SIDE_MARGIN, MD_BOTTOM_MARGIN,
+        MD_SIDE_MARGIN, MD_TOP_MARGIN
+    };
+
+    if (pdev->HWResolution[0] != 600)
+    {
+        emprintf(pdev->memory, "device must have an X resolution of 600dpi\n");
+        return_error(gs_error_rangecheck);
+    }
+
+    gx_device_set_margins(pdev, md_margins, true);
+    return gdev_prn_open(pdev);
 }
 
 /* MD5000 monochrome mode entrance. */