Adapted from one of Stern’s Service Manuals

REGULAR MAINTENANCE

(MONTHLY/500 GAMES)

• Remove the playfield glass
• Enter the software diagnostics menu, start lamp test, then
clean and wax the playfield.
• While cleaning the playfield, identify and repair malfunc-
tioning lights, loose parts, cracked plastics and worn
rubber parts.
• While in diagnostics, enter the switch test (Select the “SW”
Icon, then “TEST” Icon).
• Use a pinball to actuate all switches and verify the cor-
rect switch registers with the switch test.
• The game will play a sound to confirm the switch.
• Lift the playfield and inspect all assemblies for loose parts,
broken wires or excessive wear. Look at the bottom of the
cabinet for any parts that may have worked loose, then find
the source.
• Check all coin door mechanisms and bill acceptor (if in-
stalled) for proper operation
• Play the game to ensure all coils and features are working
• Check the playfield to ensure it is level and set to the prop-
er pitch using the bubble level on the right side wood rail.
• Check game audits: Replay % and Ball Time and note
abnormal values which can indicate problems.
• Ensure game volume is set appropriately for the location.
• Clean both sides of the playfield glass and reinstall.
• Check and clean pinballs and replace if excessively worn or
scuffed. Dirty pinballs accelerate game wear.

OVERHAUL MAINTENANCE

(5000 GAMES)

• Verify latest game software is installed
• Check flippers for excessive wear. Excessive flipper sloppi-
ness (vertical or horizontal) or weakness indicates a flipper
rebuild is required.
• Clean machine inside and out and check leg levelers for
free operation.
• Visual check for loose or broken playfield and cabinet parts
and repair as necessary.
• Electrical check: Plug into grounded outlet and check for
proper operation through DIAGNOSTICS.
• Replace worn or dirty rubbers.
• Replace pinballs.
• Check all playfield switches with a pinball.
• Check all settings (refer to manual for factory settings).
• Check coin door: With door closed, insert coins to verify
proper operation.
• Check for proper adjustment of the plumb bob tilt.
• Play game: Check for satisfactory operation.