1: Check whether the adapter has the correct 24V stable output, you can try other 24V adapters
2: Open the cover and check whether the motherboard UV light port and the adapter board port have stable 24V.
Increase the exposure time and select the exposure test. During the exposure test, check whether there is a voltage pulse signal of about 3.5V at the UV light port of the constant current board. If there is no damage to the motherboard, replace the motherboard.
There is pulse output, re-plugging and unplugging the UV lamp wiring will improve the problem. The wiring is loose.
No improvement. Check the wiring at the constant current board. Solve the problem. The wiring at the constant current board is loose.
No improvement, UV constant current board and light board parts