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(Topic ID: 235401)

Knocker not firing on Flash.

By crujones4life

5 years ago


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Knocker (resized).jpg
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#16 5 years ago
 
TK

Tuukka

Pinside member

FI Lempäälä

5y 78,350 1,762 16 18

The coil at 4.5 ohms is OK, so is the diode with 0.7V drop. Does the knocker work if you short its driver transistor collector (tab) to ground? If it works then, you have a bad transistor - either the power transistor or pre-driver. If not, then check connectors for bad contact.

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#26 5 years ago
 
TK

Tuukka

Pinside member

FI Lempäälä

5y 78,350 1,762 16 18

If you tried grounding directly at the coil and it still did not work, there is a problem getting +24V power to the coil (the red wires).

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