Frispel
sedan 2001
Dessutom ligger ytterligare två switchar i samma kolumn, 'Left Return' och 'Right Return', d v s inlaneswitcharna.Kolla om de två funkar i switchtest. Om inte är det hela den kolumnen som är utslagen på något sätt.
When in a hurry, many make an under playfield adjustment with the game turned on. Doing a switch adjustment with the power on could easily short a coil lead (+25/50 volts) to a switch lead. This will immediately blow the switch matrix, and fry the most anything to and including the 6821 PIA at U38. You can bet the switch row 4011 chips at U30 and U39 will have failed (turning on the switch rows 1-4 and/or 5-8). Also it could take out the switch column 2N3904 transistor(s) and the 74LS244 chip at U40.