text: <s>[INST] Multiple Drives Similar Failure- Grenading resistors. Summary: All 3 have blown the same resistor.In the last two weeks we've had 3 drives literally explode the R14 resistor on the main board of the drive. All three drives are catalog no 20G11G D 014 AA0NNNNN Frame 1 Series A 755 I doubt the problem is dirt, because we have the same model drive in dirtier areas that have been running for several years. If someone could point me in the right direction to find a solution to the probelm or explain what the resistor does, it will help me diagnose the problem. [/INST] What has changed in / around the application where these drives reside? The image you've shared is of a drive manufactured in November 2011. These are not new drives. If they've been running for years, and then suddenly failed, what changed in the area? Did something change in the utility power? Recent maintenance on the motors? New installation of equipment on the same utility feed? Something is different than the way things were three weeks ago. \\n </s>