The left magnet under the mini-playfield (Powerfield) does nothing in test, and only about 8 V is measured at its connector instead of the full coil voltage.

Left mini-playfield magnet dead, about 8 V at it: F101 blows, shorted Q26

Cause: The magnet's fuse F101 had blown because its drive transistor Q26 was shorted, so a new fuse blew again straight away. Note that the original manual lists F101 and F102 as unused, but they do feed these magnets.

Checks

• With the game on, check for full coil voltage at both lugs of the magnet when it is not firing; low or missing voltage points to the feed.
• Pull F101 and F102 and test them with a meter; check whether other coils on the same fused circuit are also dead.
• If a new F101 blows right away, test drive transistor Q26 for a short and check the coil lugs aren't touching ground.

Fix

• Replace the shorted Q26 and fit a new F101 of the correct rating.

Systems

• WPC Fliptronics

Games

• Twilight Zone

Related tips

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• No coils work at all, fuses are good
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• No coils, lamps, GI or flashers but display and sound work: check blanking
• Coil-not-working checklist

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