But the screen had been glitching, too. That wasn't mechanical. He consulted the "Display Diagnostics" section. The manual suggested checking the ribbon cable connection to the LCD.
The manual is generally divided into sections that vary in usefulness: stat fax 4700 service manual
: The instrument is factory-calibrated and generally described as "maintenance-free" for the end-user. However, manual calibration for specific assays (like Histamine testing) involves running known standards to obtain reference figures. But the screen had been glitching, too