Dyson & Sebo Vacuum Cleaner Repair & Advice Forums

Dyson Models => First Generation "The Ball" Dysons. => Topic started by: Bendini on January 20, 2012, 09:16:10 PM

Title: DC24 PCB Output Voltage
Post by: Bendini on January 20, 2012, 09:16:10 PM
Hi there

I have been working on some DC24s one of which had a blown PCB in the head. There was a dead short in the motor which had blown the large grey resistor. I acquired a non-working second hand head and tested it. The PCBs DC output voltage measured at 322v on my meter whereas the motor is rated at 240v DC. I suspected it to be faulty and bought a second hand PCB from a reputable source. This too showed 322v output at the pins where the black plug for the motor exits the PCB. I figured it was unlikely that both PCBs were faulty and connected the motor. It seems to run fine, hasn't blown or tripped the reset/overheated and doesn't seem to be running the brushbar too fast. Can anybody tell me if this voltage is normal?

Thanks 
Title: Re: DC24 PCB Output Voltage
Post by: Vacuum Cleaner House on January 20, 2012, 09:50:04 PM
the pcb on the dc24/25 is not to reduce voltage but actually to change it from ac- dc the motor is a 220v dc ,other wise know as a voltage rectifier.  I would get a new electrical tester. ;)
Title: Re: DC24 PCB Output Voltage
Post by: Bendini on January 21, 2012, 08:57:17 AM
Hi thanks

That is what I thought. As you say the PCB is a rectifier not a transformer and otherwise just incorporates the reset device. I will try a different tester. I think I have an analogue one with a needle readout somewhere and see what reading I get on that