The Tangles’ 7 Opto board is a fully compatible replacement for the original Bally Williams part  A-15576.1.  Similar to the 10 opto board, the original boards suffer from heat stress.  The new Tangles board has the power resistors mounted on ceramic spacers and cooling holes underneath.

Installation

The TPP-1024 board has four mounting holes compatible with the metal mounting brackets.  The rivets on the original board need to be drilled out with a 3.5mm drill.