To adjust Cutoff connect an oscilloscope to the Blue cathode. Adjust the screen VR until the black level is 160V ± 2V.
Black Level 160V ± 2V GND
SELF CHECK
Self-check is used to automatically check the bus lines and hexadecimal code of the TV set.To enter Self-Check mode, press the STATUS button on the remote control and at the same time press the down (-/v) button on the customer controls at the front the TV set. To exit Self Check, switch off the TV set at the power button.