Ok,
Make you measurements on the pins of the 298 directly. No power applied, assuming the multiwatt package:
1. Measure resistance between pin 15 and pin 1. should be low resistance < 5ohms
2. Measure resistance from pin 15 to pin 8. should be low resistance < 2ohms
3. Measure resistance from pin 1 to pin 8. should be low resistance < 2ohms
With power:
4. Measure dc volts at pin 9 to pin 8(negative) should be 5.
5. Measure dc volts at pin 4 to pin 8, should be 25.
Phil |