Schematics may show W1/W2 as a display-type setting

Some schematics label W1/W2 by display type: W1 in, W2 out for dot matrix; W1 out, W2 in for alphanumeric. This matches the EPROM-size settings those games shipped with.

Systems

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

Related tips

• "Checksum Error" at power-on
• Set imported games to an English country setting
• Signals a dead CPU board should show
• "Time and Date Not Set" message
• CPU board completely dead
• "Country code must be specified" message
• 'Check F114 and F115' then ground short row 1: failed 12 V regulator on CPU
• Outhole, shooter diverter and gumball motor all dead: CPU board chip at U4

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