Lamp test can hold coils on for five seconds
On games where driver outputs Q3/Q4 (lamps L3/L4) pre-drive under-playfield coil transistors, the five-second lamp test energizes those coils for the whole five seconds. Expect it.
Systems
Related tips
- Firing coils from CPU buffers Z6 and Z7
- Why System 1 coils lock on: the ground shift
- A CPU controlled coil does not fire
- A shorted coil means replacing its whole driver path
- Coils or driver transistors run very hot
- Testing the 2N6043 coil drivers
- How many coils the driver board can fire
- Which driver transistor fires which coil
Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)