Taxi
Williams, 1988Working on my game yesterday and I noticed that one of the banks of ceramic resistors (left bank in picture) was pretty hot to the touch, much moreso than the one on the right. R82 to R88 are the ones in question. Cause for concern? Things to check into? Much appreciated!
The resistors on the base of the lamp column drivers get really hot and its pretty normal. Some may be hotter than others because of the duty cycle. They are all normally getting strobed, but it becomes a problem when a column circuit locks on for whatever reason. If a column circuit locks on the resistor will get so hot to the point they desolder themselves and/or burn the board. If all your lamps are working properly and none seem really bright, your columns are probably fine and the heat is normal.
You can look on pinwiki for information about replacing these lamp column drives with a different technology transistor that does require the big current limiting resistors that get hot.
Quoted from barakandl:The resistors on the base of the lamp column drivers get really hot and its pretty normal. Some may be hotter than others because of the duty cycle. They are all normally getting strobed, but it becomes a problem when a column circuit locks on for whatever reason. If a column circuit locks on the resistor will get so hot to the point they desolder themselves and/or burn the board. If all your lamps are working properly and none seem really bright, your columns are probably fine and the heat is normal.
You can look on pinwiki for information about replacing these lamp column drives with a different technology transistor that does require the big current limiting resistors that get hot.
Thanks this makes me feel alot better! No bright or abnormal light behavior that I can tell but appreciate the knowledge so I can just keep it in mind if anything does seem weird later on.
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Fairview Park, OH