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HP LaserJet Pro MFP M26a T0L49-60001 - USB not working, schematic needed

perlafa 216 2
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  • #1 21948360
    perlafa
    Level 1  
    Posts: 1
    Mi servirebbe lo schema elettronico della scheda T0L49-60001.

    AI: Di quale dispositivo fa parte la scheda T0L49-60001? Puoi indicare marca e modello esatto?
    HP LaserJet Pro MFP M26a.

    AI: Ti serve lo schema per una riparazione specifica? Se sì, qual è il guasto o il componente/area della scheda interessata?
    USB non funzionante.

    Added after 1 [minutes]:

    Non ho avuto risposta.
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  • #2 21949558
    kkozik
    Level 11  
    Posts: 14
    Help: 1
    Rate: 3
    >>21948360 I also have a question: does your board only have ‘T0L49-60001’ printed on it, or does it also have a type number such as RM2-xxxx, CFPMxxx or another PCB number? Often, the same laminate is marketed under a different designation, which makes it easier to find the documentation.
  • Check USB data continuity, series resistors, and 5 V supply

    #3 21955174
    krakarak
    Level 42  
    Posts: 8869
    Help: 681
    Rate: 1851
    I may be mistaken about the specific model, but there are only two components on the circuit path from the USB socket to the microprocessor, which I measured with a multimeter. All you need to do is carefully measure the connection between D+ and D- from the socket to the microprocessor; if the connection is present but there’s no voltage, the microcontroller’s USB functionality has failed due to a power surge. On a few occasions, I found and replaced a resistor on one of the data lines, and the USB worked again. And there must be +5V at the USB socket.
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