In those areas of the country that are subject to large power line voltage fluctuations, excessive voltage may be applied to capacitor C12 on the AVR unit (X43-1500-00). These voltage fluctuations might exceed the capacitor breakdown voltage. Replacing capacitor C12 with a capacitor having a higher breakdown voltage will help prevent this potential problem.
On the AVR unit (X43-1500-00) change C12 from a 6800 µF capacitor to a 5600 µF 25 V capacitor (C90-2037-05)
This change is applicable to serial numbers prior to 701xxxx.
Time required for this modification is 1 hour or less.