Toshiba TR PMIU, User Manual, Page: 36 / 182

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Trouble shooting
If PMIU unit causes malfunction, or any unit emits smoke or odor, shut OFF all power of your system/machine
immediately and safely.
When you check the system/machine, give measures carefully so that harmful operation should not happen.
Make sure enough safety when you turn ON the power when investigate the failure cause.
If the problem is found in the TR unit, check the following points;
1. Supply of power
2. PMIU unit
3. Input and output of Expansion I/O unit
4. Remove all Expansion I/O units and check PMIU unit alone. If PMIU unit operates normally, connect each
Expansion I/O unit one by one. There is possibility that breakdown of some unit causes overall
malfunction.
5. Check operation of unit in the place where a trouble happened. If the unit operates normally, some
environmental factor may causes trouble. If unit causes malfunction synchronously with other
device/machine/equipment, they might cause trouble.
Supply of power
・ POWER LED
POWER LED is lit or blinking when power is supplied to the unit regardless of unit mode. If not lit, power
is not supplied to PMIU unit.
・ Wiring of power supply
Check connection of wire and terminal block. Screws of terminal block should be tighten surely, and
terminal block should be inserted to connector of unit surely.
The core wire which came loose may short-circuit with the next terminal.
・ Input voltage
Check polarity and voltage (DC24V +/- 15%) at power supply connector of unit. Do not connect AC to
the unit. Electromagnetic noise, voltage fluctuations, surge of voltage must not superimpose to power line.
If the capacity of the power supply is extremely small, when the input/output circuit operates, or supply
voltage is dropped by inrush current of unit, unit might not be able to be booted.
・ Cable
If POWER LED become lit when remove cable (communication cable or programming cable), the there is
short-circuit in the external connections of the port. Check USB or serial cable, or USB/COM port of
your PC.