单项选择题
Which of the following is the BEST tool to troubleshoot a DB-9 port?（）
A. Ohm meter
B. Anti-static wrist strap
C. Oscilloscope
D. Loopback plug
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A laser printer displays ‘perform user maintenance’. The manufacturer’s information was not available when the user performed the maintenance, and the laser printer continues to display the maintenance code. Which of the following items needs to be performed?（）
A. The printer needs to be sent to the manufacturer for maintenance.
B. The printer’s firmware needs to be updated.
C. A printer system reset must be performed.
D. The maintenance page counter must be reset. -
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A technician has just installed a new power supply into a desktop computer and now the computer will not turn on. Which of the following is the MOST likely cause?（）
A. The voltage selector switch on the power supply is set incorrectly.
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D. The 12v power cord is installed incorrectly. -
单项选择题
A legacy PCI IDE controller card does not recognize a new IDE HDD. Which of the followingmaintenance techniques would BEST resolve this situation?（）
A. Perform a BIOS upgrade
B. Update the IDE controller's firmware
C. Format the HDD on another PC
D. Update the IDE controller's driver
