Keithley DMM7510 7.5-digit desktop multimeter is said to be comparable to 8.5-digit multimeters on the market in terms of performance and functions. In early September, an old customer in Shenzhen sent a faulty machine to the repair company, reporting that the instrument could not be turned on. The following is a simple repair measure shared by an Antai Keithley maintenance engineer:
Fault phenomenon
The instrument cannot be turned on normally after powering on. 
Inspection and repair
The instrument cannot be turned on. First, solve the problem of turning on. After a series of inspections, it was found that the logic unit of the instrument control board was damaged. After replacing the damaged components, the instrument can be turned on normally, but a new fault occurred. The error A/D time out appeared when it was turned on. Continue to check and detect, and find that the instrument mainboard is faulty, causing the instrument to report an error. Replace the damaged components and test the instrument. 
Repair results
The instrument starts normally, the error disappears, the measurement signal is normal, and the repair is completed.
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