First the outhole kicker fired constantly; afterwards, in switch test, pressing any switch on one row of the matrix made every switch on that row show closed.

Pressing one switch closes the whole row: bad 4011 chip on the CPU board

Cause: A failed 4011 NAND gate chip on the CPU board in the switch matrix circuitry. On this game the chip had failed before and was already socketed.

Checks

• In switch test, note which row or column is affected and check that row's switches under the playfield for crushed wires, bent tabs touching, or shorted diodes, especially near the edges after raising and lowering the playfield.
• If the wiring is clean, use a logic probe on the CPU board's switch circuit chips for that row to find a gate that isn't switching.

Fix

• Replace the faulty 4011 (socket it if it isn't already).

Systems

• Data East CPU Version 1/2

Games

• Time Machine

Related tips

• Switch row trace map from CN10 to the 4011 chips
• Switch row or column error: CPU board or playfield?
• Switch row (return) circuit on the CPU board
• CPU connector CN10: switch row pins and wire colours
• One switch row dead: parts to check in order
• Whole switch column dead after working under the playfield
• Which switches are outside the switch matrix
• Check the switch matrix with a logic probe

Source: Pinball Repair help group!! (Facebook group)