The display asks for a country code to be set using jumpers W15-W18.

"Country code must be specified" message

Cause: The country jumpers W15 to W18 on the CPU board are in a combination the game does not recognise. Twilight Zone is the game most often seen doing this.

Checks

• Look at W15 to W18 left of the large U9 chip and note which are in.
• Compare with the setting given inside the front of the game manual.

Fix

• Set the jumpers to the manual's value. For North America, removing all four (America2) gives English defaults and needs only cutting, not soldering.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS

Games

• Twilight Zone

Related tips

• Outhole, shooter diverter and gumball motor all dead: CPU board chip at U4
• "Time and Date Not Set" message
• The CPU must be a 68B09E
• Pre-WPC-S CPU EPROM size jumpers W1 and W2
• Schematics may show W1/W2 as a display-type setting
• CPU board completely dead
• CPU board from an early game won't boot: ROM jumper W1
• DMD dead though display and controller work in other games: CPU board fault

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)