NLG Users Repair Logs and Other Ramblings. Request your very own topic. Just ask any site staff. > Channelmaniac's Arcadecomponents' Old School Repair Logs

Sega Games (Other Arcade)

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channelmaniac:
Model: Turbo Out Run
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.

channelmaniac:
Model: Turbo Out Run
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.

channelmaniac:
Model: Turbo Out Run
Symptom: No audio

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

channelmaniac:
Model: Sega NAOMI
Symptom: Fails self test

Self test showed IC29 as bad. Replaced IC29 and re-ran the test.

IC29 was a standard 62256 surface mount type SRAM IC.

channelmaniac:
Model: Sega NAOMI
Symptom: Dead

System gave raster but no picture. Inspection of the board turned up a leaking .1f 5.5v memory capacitor. The electrolyte spread on the board and started corroding things.

Desoldered the BIOS ROM and the serial EEPROM holding the code for the Altera FPGA chip. Cleaned the electrolyte from the board and inspected the board for damage. The corrosion damaged a plate thru under the serial EEPROM socket, causing the FPGA chip to not load its code from the EEPROM upon boot. Repaired the trace, replaced the bad memory cap, and tested the board.

The EEPROM chip connects to the Altera chip as follows:

Pin 1 - Pin 12
Pin 2 - Pin 1
Pin 3 - Pin 37
Pin 4 - Pin 4
Pin 5 - Ground
Pin 6 - No Connection
Pin 7 - +5v
Pin 8 - +5v

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