![]() If you have access to a capacitance meter, you could try measuring the component’s capacitance with it in circuit – which would give an indication if it is OK or not. Typically the start up IC capacitor is of the order of a few uF at around 50Vdc.Īs others have said you need to exercise extreme caution measuring mains voltages on such a PCB – but with mains power present you should have around 10-15Vdc across this component. Looking at the photos, this capacitor is the one located just to the left of the transformer, smaller in size than the electrolytic reservoir capacitor (top left). The Canon PIXMA MX922 Energy Star Wireless Inkjet Office All-in-One Printer prints in black and white at 15. ![]() When this capacitor fails – the primary switching IC cannot get started, so there is no output from the PSU. The SMPS needs a voltage for this IC to initiate the HF switching (before the supply to the IC is generated from the transformer windings). Connect an external device such as a computer or a smartphone to the machine via wireless LAN. The machine enters the access point mode. Check the message that is displayed, then press the OK button. ![]() If the fuse is OK, in my opinion the most likely component to have failed is the start up capacitor for the primary switching IC. Use the button to select Access point mode, then press the OK button. Wouldn’t it be great if by just looking at a photo – anyone could determine which components had failed, making repair a doddle?Īnyway – check whether the PCB input fuse has operated it is the small black component on the separate PCB (use a multimeter to measure its continuity). Check for voltage on the two electrolytic capacitors at the right hand edge of the board in your second photo. ![]()
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