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Have a GBC Shredmaster 2260X shredder. Began showing "door open" when door was in fact properly closed. Seemed as if "door close" switch was the problem. But would go from "door closed" to "door open" indication by itself during a day as if temperature variation was a factor. Finally, it just shows "door open" at any time. I have removed the switch and checked it. NO to common and NC to common work fine. The switch is fine. I have shorted the proper wire to common without the switch, and the machine still shows "door open". The problem must be on one of the two circuit boards. Any thoughts on this? Thank you. David Seales

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  • dmseales Oct 01, 2009

    There are only two circuit boards. I have been over every semiconductor, chip, diode and most of the can capacitors. Nothing "closes the door". Do you have access to a schematic so we can figure out which component(s) are the most likely suspects? Are we hearing from anyone else who has had the same problem and has solved it? David

  • dmseales Oct 02, 2009

    Not sure this next section went through to you. Have heated and/or cooled each transistor, diode and chip and most of the can capacitors on the two circuit boards. No luck. Do you have access to the circuit diagrahm and/or trouble-shooting material? David

  • dmseales Oct 02, 2009

    This is a shredder, not a sewing machine.

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This issue is caused by a overheating semiconductor in the board. It may be a simple transistor or the entire chip. To locate the broken board, just follow the wires from the door switch.

If you feel confident about electronics repair, use some canned air to cool down each component, one by one, first transistors, then integrated circuits. As soon you see the shredder stops showing "door open" after cooling a specific part, you will know which one is broken.

If you have no experience about repairs, I do not recommend you to continue using or trying to fix it. Just remember; the safety features are not working properly and it is not safe to operate or play with it. Don't lose a finger just to save some bucks.

Good luck!

Posted on Sep 30, 2009

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Posted on Jan 02, 2017

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