DEC VT420 Service Manual page 39

Removing and Replacing FRUs 31
8. Remove the arc protection board from the back of the CRT.
G S F _ 1 4 4 7 _ 8 9 . D G
CAUTION
To prevent damage to terminal board components, be careful
when you unlock and remove the yoke wiring harness
connector in the next step.
To prevent damage to the connector wires, only pull on the
connector.