Fuse F103 on the power driver board blows as soon as the game is powered. After that is fixed, the ball magnet does not grab the ball and pulsing it in test makes the right ramp diverter move.

F103 blows instantly: shorted ramp diverter coil; magnet fires the diverter if F104 open

Cause: The right ramp diverter coil had shorted (about 1 ohm instead of the usual few ohms), which blew F103. Separately, F104 was open: the diverter's protection diode returns through that fuse, so with F104 blown the magnet and diverter end up in series and the magnet fires the diverter instead of holding the ball.

Checks

• Unplug the coils and plug them back one at a time to find which one blows F103.
• Measure the suspect coil's resistance with power off; around 1 ohm means it is shorted.
• Test F104 with a meter, not by eye.

Fix

• Replace the shorted ramp diverter coil (and its drive transistor if it has failed).
• Replace F104. Some owners also fit a 1N4004 diode directly across the diverter coil, banded end to the power side, for extra protection.

Systems

• WPC-95

Games

• Tales of the Arabian Nights

Related tips

• Coil locks on as soon as the coin door closes: transistor shorted by the old coil
• Switch matrix fuse F115 (F101 on WPC-95) blows as soon as it is replaced
• Brand-new coil burns up soon after fitting: find the reason the old one burned
• WPC-95 driver board fuse ratings
• A coil keeps firing at power-on and the DMD is blank
• Typical causes of each blown fuse (WPC-95)
• "Check Fuses F114/F115" (F106/F101 on WPC-95) message
• "Check Fuse F114/F115" (F106/F101 on WPC-95): step-by-step

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