Hyperball
Williams, 1981I have two rows of lights out on my Hyperball and saw that they are linked to Q19 and Q25. However, after looking in the manual it just says that they are NPN darlington transistors, it does not tell the specific kind of transistor. Does anyone know the specific kind?
Are the TIP 101 and TIP 121 interchangeable? I am safe to ground out the metal tap on the two affected row transistors and see if the rows turn on correct? If they turn on then at least I know that the wiring going from the board to the play field is good.
Quoted from Pepse25:I have a mixture of TIP101 and TIP121 in mine
Perhaps this poster meant TIP102. TIP101/121 are different animals.
Can you read the part number on one of the other transistors?
No, I wouldn't ground the tab. I'd test the transistor using diode test on your DMM. Compare readings to known good transistors of the same type.
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Chris Hibler - CARGPB #31
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Logic probe out the entire circuit starting at the PIA. To the 7406 inverter, to the 2n6427 predriver to the main driver transistor. There is also an SCR in the row circuit.
Rows strobe the ground. Columns strobe the positive +18v. Grounding a column tab would blow the fuse or worse. Grounding a row driver would just turn on all those lamps. This would only prove that the circuit from the driver transistor to the PF is good and not open from a bad connector or broken wire.
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Benton, PA