EasyCoder PX4i and PX6i Service Manual 151
Chapter 15 — CPU Board
15.4 Test Points
The CPU board is provided with many test points. Only those of immedi-
ate interest to the fi eld service technician are shown below. If further test-
ing or servicing is required, exchange the CPU board and return the faulty
board to a service center.
Test Points
If available, use an oscilloscope to measure the various voltages. When
using for example a multimeter, a fl uttering value may indicate an errone-
ous voltage.
GND Ground
2.5V 2.5V –> GND (max ± 0.2V)
3.3V 3.3V –> GND (max ± 0.2V)
5.0V R718 –> GND (max ± 0.2V)
24V F70 left side –> GND (allowed deviation ± 2V)
(If no voltage on the left side, check the right side. If voltage
there, fuse is blown; else cable, driver board, or PSU trouble.)
DONE High level = U30 programmed, see Chapter 15.5
DEBUG Startup check, see Chapter 15.5
WAND Use an oscilloscope. OK if there is a pulse train when the wand is
reading a bar code.
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