Auto Multimeter APPA 25, 23 - Repair and Troubleshooting.
Automotive multimeter APPA 23, 25 Taiwanese firm APPA, is a professional-level device. APPA ranks second in the world in terms of production of multimeters and clamp-on ammeters.
Multimeter APPA 23, 25 has the basic automotive modes.
Duty Cycle - measurement of the pulse ratio in percent.
Dwell Test - measurement of the angle of the closed state of the contacts (ignition advance angle) in degrees for 4, 5, 6, 8 cylinders.
Lo TACH - tachometer for idle speeds, up to 2000 turns.
Hi TACH - 1/10 tachometer, for maximum revolutions, up to 10,000 revolutions.
Lambda probe test - on the 2V range of constant voltage (inscription Point).
If the mode switch is not used, the multimeter automatically turns off after approximately 30 minutes.
Malfunctions of a multimeter APPA 23, 25: or open or short circuits of input voltage limit dividers.
For ease of repair, I provide a photo of the board input resistive dividers.
After replacing, well rinse the soldering area with alcohol.