At power-on the game goes to audits instead of attract mode (on System 4-7, "04 00" in the credit and ball-in-play displays).

Game powers up in audit mode

Cause: Stored settings were lost: dead batteries, a bad battery holder, failed blocking diode D17, a bad IC19 5101 RAM, or corrosion damage.

Checks

• Check the batteries and holder.
• Measure IC19 pin 22 (to pin 8, ground): about 3.9 to 4.3 VDC.
• Check D17.

Fix

• Replace batteries, holder or D17 as found; if all are good, replace the 5101 at IC19.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Game powers up in audit mode instead of attract mode
• System 3 with no batteries boots into audit mode
• Battery holder looks fine but makes no contact
• Audit mode with under 3.6 V at the RAM
• Lights up but dead after storage: leaked batteries on the board
• Boots straight into the adjustments menu: corroded battery holder
• Replace batteries of unknown age right away
• CPU will not boot after battery corrosion

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)