Judge Dredd
Bally, 1993Wpc 89 driver board. Judge Dredd.
Was removing bad transistors when I noticed this resistor looked off. Testing with the meter confirmed it's dead. But I'm a bit confused as to getting a replacement. Williams schematics show R150 as being a .22 ohm resistor. The banding shows it to be a .69. Do the rottendog boards differ from the official schematics?
PXL_20211006_154324015 (resized).jpgQuoted from frobozz:What's wrong with the resistor, other than being gouged up a bit when you were removing the transistor? Merely a flesh wound - I bet it still measures fine.
It measures nothing at all.
Quoted from PinballAir:Failed open?
Also, the solder joints on R150 look a lttle iffy
Looks like it's closed. I get no continuity through it, and measuring resistance just shows OL on the meter.
All the other like resistors show .6 ohms and show continuity.
Quoted from trolldownstairs:Williams schematics show R150 as being a .22 ohm resistor.
Quoted from trolldownstairs:The banding shows it to be a .69.
Quoted from trolldownstairs:Do the rottendog boards differ from the official schematics?
That should answer the question. I believe the resistor is actually a 0.68 (R68) Ohm 5% resistor. It is often difficult to tell the difference between gray (8) and white (9) particularly when the resistances are small. The E12 values of R47, R56 or R68 fit the bill.
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Salinas, CA