With test EPROM 2 fitted, the five-flash burst does not appear.

Test EPROM 2: game PROM socket test fails

Cause: A fault in the traces, select logic or address buffers to the game PROM socket, a bad D102-to-2716 conversion, or wrong jumpers on newer boards.

Checks

• Check traces from the 6502 to the socket.
• Check Z7, Z9, Z10 and Z12.
• On converted D102 boards, check the conversion wiring.
• On newer boards check jumpers E3, E4 and so on.
• For a 2732 game PROM, check address line A15 reaches the socket from TC1 pin 35.

Fix

• Repair the fault. To feed A15 for a 2732 without cutting traces: remove jumpers E3 and E4 and wire TC1 pin 35 to the point where E3 and E4 meet.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• Test EPROM stalls at the switch matrix RIOT (U4)
• Test EPROM: no long flash, or LED stuck on
• Test EPROM stalls before the RAM pass flash
• System 80 test EPROM LED flash codes
• Replacing U2 and U3 with one 2764 EPROM
• Ways to fit EPROMs at U2/U3
• Which System 80 test EPROM image to use
• Bench setup for the System 80 test EPROM

Source: Gottlieb System 80 Test EPROM V3.2 (February 2015), Pinitech