Turbo Out Run Repair Logs

From Arcade Otaku Wiki
Jump to navigation Jump to search

Repairer: channelmaniac

Symptom: Dead

Lights were on for the video board but not for the CPU board. Replaced burned power connector and adjusted power supply voltage to 5.05v.

Symptom: Missing obstacles and background objects

This was a strange one. The sky and road obstacles were missing. The buildings were there but the road and the car never moved left or right. This was a problem with the subprocessor. Built-in tests showed one of the ROMs bad. ROM read good in an EPROM programmer and a replacement ROM gave the same symptoms. Checked all the pins on the socket for continuity. The ROM pairs (High & Low) had a common CE line. This was driven by a 74LS138. The chip had badly rusted legs. Replaced the chip and the game worked normally. The rust had travelled up the body of the chip.

Symptom: No audio

Resoldered the interconnects and the audio output IC on the amplifier board.

Retrieved from ‘https://wiki.arcadeotaku.com/index.php?title=Turbo_Out_Run_Repair_Logs&oldid=7284’