Every time the game is switched on it goes straight to the game adjustment menu, even after fitting new batteries.

Boots straight into the adjustments menu: corroded battery holder

Cause: The on-board battery holder's terminals were damaged by old battery corrosion, so the memory chip (5101 RAM) was not being kept alive.

Checks

• Check the voltage across the memory backup at the board, not just at the batteries.
• Inspect the holder terminals and the board under and around the holder for corrosion.
• If the holder is fine, the 5101 RAM itself is the next suspect.

Fix

• Remove the old holder, clean and neutralise any corrosion, and fit a remote battery holder off the board (with its blocking diode), or switch to non-volatile memory.

Leaked battery electrolyte is corrosive: wear gloves and eye protection when cleaning it and neutralise it before rinsing.

Systems

• Williams System 7

Games

• Jungle Lord

Related tips

• Battery holder looks fine but makes no contact
• CPU will not boot after battery corrosion
• Move the CPU batteries off the board
• Clean battery corrosion off a CPU board
• Check the battery blocking diode D17
• Replace batteries of unknown age right away
• Audit mode with under 3.6 V at the RAM
• Batteries drain in days or get hot

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