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Troubleshooting
HP Designjet 4000/4020 Printer Series Service Manual
1 If the Printer cannot be turned ON:
2 If the Printer starts (after having pressed the ON button on the Front Panel)
but the front Panel remains black:
Signal LED on
Interconnect
PCA
LED on
PrintMech
PCA
Power
Switch
LED
Corrective Action
5Vsb OFF ON Amber
îš„ Check the connection between the
PSU and the Interconnect PCA.
îš„ If connection OK, replace the
Interconnect PCA
⇒ Page 8-93.
5Vsb ON OFF Amber
îš„ Check the connection between the
PSU and the PrintMech PCA.
îš„ Make sure that ALL cables between
the PSU and PrintMech are not
damaged and are connected
correctly.
5Vsb OFF OFF
Amber
or no
LED
îš„ Check the connection between the
PSU and the PrintMech PCA and
Interconnect PCA.
îš„ If connection OK, check that power
reaches the PSU (check the power
outlet).
îš„ If power reaches PSU, replace the
PSU
⇒ Page 8-113.
Signal LED on
Interconnect
PCA
LED on
PrintMech
PCA
Power
Switch
LED
Corrective Action
5V OFF ON Blue
îš„ Check the connection between the
PSU and the Interconnect PCA.
îš„ If connection OK, replace the
Interconnect PCA
⇒ Page 8-93.
5V ON ON Blue
îš„ Check the connection between the
Front Panel and the Interconnect PCA.
îš„ If connection OK, replace the
Interconnect PCA
⇒ Page 8-93 and
the Front Panel
⇒ Page 8-20.
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