HP Designjet T920

PSU LED Upper Mid Lower Problem and recommendations
Off Off Off Off The printer is not receiving electrical power.
1. Ensure that the printer is connected to the power outlet.
2. Ensure that the outlet delivers the expected power.
3. Replace the power supply unit.
On Off Off Off There is a possible power failure in the formatter.
1. Reseat the power connector in the formatter.
2. Replace the formatter.
3. Replace the power supply unit.
On On Off Off The formatter BIOS is unable to start.
1. Update the BIOS.
2. Replace the formatter.
On Blinking Off Off The formatter BIOS cannot detect the hard disk drive.
1. Reseat the hard disk drive connectors.
2. Replace the hard disk drive.
On On Blinking Off The operating system has experienced a fatal error.
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Replace the hard disk drive.
On On On Off There is a communication failure with the engine PCA.
1. Reseat the engine PCA.
2. Replace the engine PCA.
On On On Blinking There is a possible failure in the engine PCA.
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Replace the engine PCA.
On On On On There is a communication failure in the front panel.
1. Ensure that the front panel cable is properly connected to the
engine PCA.
2. Replace the front panel.
Finally, there’s another case where the printer seems to be in sleep mode but is not able to boot. All the
formatter LEDs are off, but the PSU LED is On.
ENWW What to do if the front panel fails to initialize 105