Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet II triac replacement        
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HP LaserJet II triac replacement

(From: John (jneff@uidaho.edu).)

We have been replacing these with a SK10466 (800 V, 8 A, Vgt 2 V, Igt 50 mA).

(From: dhickey@knox.edu).

If it is in the AC Powersupply, try a NTE 56006.

Also check for 2 open resistors.