Dixie Narco DNCB 501E - Credit and Free-Vending Issues; Accepts Coins, Vends, Then Rejects Coins but Continues Free-Vend

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ACCEPTS COINS AND WILL VEND,
THEN REJECTS COINS BUT WILL CONTINUE TO FREE-VEND
Problem 1: Set up Credit Push a Selection It will vend
Push same Selection It will vend
Rejects coins Push same selection It will continue to vend
Reason: The by-pass switch is not canceling the credit.
Check: The by-pass switch electrically If faulty replace
The by-pass switch for a sticking plunger If faulty replace
The by-pass for incorrect wiring If faulty correct
Set-Up credit Push a selection It vends
Push same selection It does not vend