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From the Owner's Manual for a 1971 F model:
"When an external power source is connected, a split bus contactor automatically removes power from the electronic section of the split bus to protect against damage to the transistors in the electronic equipment by transient voltage from the power source. Therefore, the external power source can not be used when checking electronic components."
Last edited by JimC : 09-26-17 at 03:10 PM.
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