What are the Main Control Valve & Circuit for HL770-7A
{"Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "ACDSee Pro 9", "Image DateTime": "2019:04:30 15:28:02", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "159", "EXIF SubSecTime": "540", "EXIF ExifImageWidth": "451", "EXIF ExifImageLength": "630"}