After a flipper rebuild and rewiring, the lower flipper moves as if only the hold winding is powered, even though 70 V is present at the coil lugs. The upper flipper works normally and jumpering the EOS made no difference.

Flipper only has hold strength after a rebuild: EOS wire on the wrong coil lug

Cause: The EOS switch wire was put back on the wrong coil lug, so the switch no longer shorts out the hold winding at rest.

Checks

• Compare the coil wiring with the schematic or the other flipper: the EOS switch must connect across the hold winding, on the hold lug that also carries the ground/drive side.
• Check that the coil is mounted the right way round, with the lugs matching the schematic.

Fix

• Move the EOS switch wire to the hold lug that shares the ground side, as shown in the schematic.

Systems

• Data East CPU Version 1/2

Games

• Secret Service

Related tips

• Checking a pre-solid-state flipper coil
• Flipper coil runs very hot (Time Machine and earlier)
• Flipper flutters when held (Time Machine and earlier)
• Flipper circuit on Laser War to Time Machine
• Weak flipper on Time Machine and earlier: pitted switch contacts
• Pre-solid-state flipper keeps blowing its fuse
• Diode direction on three-lug flipper coils
• Solid state flipper has no power though fuses are good

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