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Troubleshooting

HP Designjet 4000/4020 Printer Series Service Manual

Using the PCA LEDs to Troubleshoot

In certain circumstances, the LEDs located on the Interconnect PCA and

PrintMech PCA can help to troubleshoot the Printer. The LEDs can either be

ON or Off and using different combinations can indicate different problems:

5Vsb

24V

Interconnect PCA

5V - Comes from the PSU after the fuse on Interconnect PCA. Used to power On Front Panel

and some Interconnect Electronics. Should be ON at the same time as Blue Power Switch LED.

5Vsb - Comes from the PSU after the fuse on Interconnect PCA. Used to power On the Printer

from the Front Panel. Should be ON at the same time as Blue or Amber Power Switch LED.

24V - Comes from the PSU after the fuse on Interconnect PCA. Used to power the Carriage

PCA. Should be ON at the same time as Green Power Switch LED.

PrintMech PCA

5Vsb - Comes from the PSU after the fuse on PrintMech PCA.

3V3

ERIDANI

24V

VPOWER2

VAUX

VAN

5SB

3V3 - Comes from the Power Supply Unit.

5V - Comes from the Power Supply Unit.

ERIDANI - Specific power line from PSU which powers ERIDANI chip after a fuse on PrintMech.

24V - Comes from the PSU after a fuse on the PrintMech PCA.

VPOWER2 - Comes from the PSU (42V) after a fuse on the PrintMech PCA.

VAUX - Comes from the PSU (12V) after a fuse on the PrintMech.

VAN - Is generated in the PrintMech PCA (reference tension is generated from ERIDANI IC).

The value is around 5V. If this LED is not ON, and the others are ON, this indicates that

there is high probability that the PrintMech PCA is defective.

Brand

Model

4000

HP 4000 User Manual

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