Hitachi VM-E230A - Manual (Page 56)

Advanced Techniques
Note: Only replace the camera light bulb with VM-CP4L (optional) to reduce the risk of fire.
Viewfinder Bright, Color and Tint Control
This small "BRIGHT", "COLOR" and "TINT" controls are set at the factory and should
require no adjustment. If they ever require adjustment, use a plastic screwdriver. Make
the adjustments with caution to prevent damaging the miniature controls.