After around 7 or 8 years of some tough abuse and shredding my Fellowes PS-77CS Shredder has finally given up the ghost and failed on me.
The machine is getting power, but it doesn’t run the shredder motor. There are signs of power going to the device, because it detects win the bin is open and lights up the red light to say it’s open. The light goes off when you push in the Micro switch so this tells me the sensor circuit was working fine and the problem was more electrical as opposed to mechanical.
I did some dismantling of the actual equipment. Fairly simple, lift it up and remove about 10 screws. Open the lid then disconnect the wire attaching the motor to the PCB. I did a quick look around the circuit and couldn’t find any specific issues.
I finally identified the problem, I went to remove the PCB so I could look up the schematics and when removing it the transformer was literally hanging on a couple of threads of copper wire. So it came off easy enough (picture below)
I decided to remove it, as it was evident to me the transformer is what caused the problem. For those who don’t know, a transformer receives an incoming voltage in a circuit and then alters it for the output side (either by increasing or decreasing it). In this case, it’s receiving an input voltage of ~220v and outputting it into ~15.6v from what I can find online (these are the specs). I’ve wrote them below if anyone finds them useful.
Input Voltage : 220V
Output Voltage : 15.6V / 15.6V
Dimensions ???? : 8*11 (On other sites, this number translates as “specification” – so I think it’s the size)
No Idea???? : 3+4 (On other sites, this translates as “stitch / work type” – not sure if this means the number of pins)
Now, when researching online, it seems these transformers are commonly fitted to the Fellowes shredder models and seem to be the weak point of them. The point of failure is usually when the shredder falls over or gets banged about a bit. The transformer / PCB are mounted upside down in the shredder motor. So if the unit falls over it can damage it. Essentially it’s dangling on it’s own internals.
A common fix suggested by one user seems to be fitting an M2730 transformer, which is slightly bigger then hot glue it in place so it doesn’t damage it if it falls. I looked up this product and unfortunately it’s a discontinued product. So I may try places like eBay or Farnells/CPC in the UK to try and source one.
In the meantime I have emailed Customer Support at Fellowes to see if they stock spares. I’m more than happy to fit the equipment myself to get it up and working again. Failing that I’ll source one online if they cannot supply. The equipment by Fellowes is amazing. It’s stood up to some tough abuse from myself, but I’d rather not pay £100 for a new shredder if I can fix it myself for around £20
I’ll update this post as I go, hope some of you find it useful and helps you on your quest with your Fellows PS-77CS Shredder or others.
PS : If your from Fellowes, I’ll happily receive a new shredder from you if you offer me one. I wouldn’t complain 🙂
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