OPUS
ATX/ITX DC-DC 90W Power Supply User Guide
Solutions, Inc.
www.opussolutions.com
©
OPUS Solutions, Inc. 2002,2003; UG-DCX3.xx09 14-MAR-04
10
Trouble shooting guide
Computer does not turn on?
Check to make sure that battery is connected to DC-DC Power supply connector.
Check to make sure that Ignition input to DC-DC power supply is connected to pin 3 of the power input connector. Make sure
the 2-pin power switch pins are properly attached.
Computer does not turn off when the ignition is turned off!
Check the Green LED state
Interpreting the Green Status LED light flashing
0.1 sec ON and 3.5 Sec OFF Approx.:
DC-DC power supply is in Idle or stand-by state.
On
constantly
The
PC
is
powered and the PC should be operating.
Number of flashes
Reason for flashing
1 Flash
Battery voltage is below normal operating range.
The normal range is 10.6 VDC to 18 VDC.
During engine cranking the low battery voltage detection is ignored so the battery
voltage can dip below 10.6V.
2 Flashes
The computer power up sequence failed
Reasons:
1. Check the wiring of the two wire power-switch cable from power supply
connector J9 to power switch pins on the ATX motherboard. If connected
properly check the polarity of the power switch pins. May be reversed.
2. Check ATX mother board bios settings.
3. Locked up motherboard or software crash of bug.
4. Faulty DC-DC power supply.
3 Flashes
Power supply output voltages are out of normal voltage range.
Reasons:
1. Power supply output is over loaded or shorted.
2. Faulty DC-DC power supply.
4 Flashes
Power down, stand-by or hibernate sequence failed.
Reasons:
1. Check the wiring of the two wire power-switch cable from power supply
connector J9 to power switch pins on the ATX motherboard. If connected
properly check the polarity of the power switch pins. May be reversed.
2. Check ATX mother board bios settings.
3. Check if ACPI function is enabled in the power management BIOS setup.
4. Make sure ACPI drivers are installed in the operating system.
5. Check if application is compatible with ACPI mode of operation.
6. Locked up motherboard or software crash of bug.
7. Faulty DC-DC power supply
