The Mitutoyo APL‑325L is a digital readout (DRO) linear scale counter that displays position from a linear encoder and offers remote zeroing and macro key functions. Common failures on this model include loss of signal due to damaged cable connectors, power supply dropout causing the display to reset or go blank, and internal board faults such as burnt capacitors or degraded resistors leading to incorrect readings. For first‑check diagnostics, verify that the unit is receiving its rated 12 V DC input and that the voltage regulator output is stable; inspect all cable connections for corrosion or breakage; and review any error codes displayed on the panel before proceeding with a board inspection.[oss-gpt-20b]