Question about Lexmark X7350 All-In-One Printer

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Lexmark 7300 - high pitched tone

My printer emits a high pitched tone when getting incoming calls and i can't stop it unless i turn the machine off. it has only recently started doing this, i've changed the ink and checked all connections... any ideas? it's driving me mad

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shivam raj

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A GLANCE

  • RF sources can transmit energy into cables, PCB (printed-circuit-board) traces, and ICs.
  • Symptoms of RF susceptibility can be tricky to diagnose.
  • The best technique is to kill noise at its source.
  • Shielding is a high cost Band-Aid.
  • Careful layout and good system design can provide the best protection from RFI (radio-frequency interference).
Sidebars:
Insidious RF
lexmark 7300 - high pitched tone - 01df.jpgSteady streams of RF energy constantly engulf your electronic system. Some of this energy comes from the accidental byproduct of a system; other RF sources, such as radios and radar, intentionally radiate energy. Some RF sources are so strong and so insidious that they create noise in simple wires, such as the magnet wire that forms the voice coil of a speaker. It is merely annoying for consumers to hear noise in their home-audio systems. However, RF noise that causes a machine to go haywire or an airplane’s instruments to malfunction could imperil or even kill people. For this reason, the European Union and the United States instituted RFI (radio-frequency-interference) testing for products that vendors sell there. When the European Union more than a decade ago instituted the CE (Conformité Européenne) immunity-compliance tests, engineers soon learned that passing them is more difficult than passing the US FCC (Federal Communications Commission) noise-radiation tests. “Engineers don’t think it is a problem until it is a problem for them,” says Steve Bible, Microchip Technology’s technical-staff engineer. “They are in a real time crunch. They have made a bad design, and it’s hard to convince them that it’s bad. They want to find that one silver bullet—the one thing they can do so they can pass—except there is no silver bullet.”
To provide your systems with robust RFI immunity, you must understand just how many RF sources your system is subject to. The electric-power industry broadcasts 50- or 60-Hz radio waves as it

Posted on Aug 12, 2008

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