HP 4000

1-16
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
 Check the connection between the
PSU and the Interconnect PCA.
 If connection OK, replace the
Interconnect PCA
⇒ Page 8-93.
5Vsb ON OFF Amber
 Check the connection between the
PSU and the PrintMech PCA.
 Make sure that ALL cables between
the PSU and PrintMech are not
damaged and are connected
correctly.
5Vsb OFF OFF
Amber
or no
LED
 Check the connection between the
PSU and the PrintMech PCA and
Interconnect PCA.
 If connection OK, check that power
reaches the PSU (check the power
outlet).
 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
 Check the connection between the
PSU and the Interconnect PCA.
 If connection OK, replace the
Interconnect PCA
⇒ Page 8-93.
5V ON ON Blue
 Check the connection between the
Front Panel and the Interconnect PCA.
 If connection OK, replace the
Interconnect PCA
⇒ Page 8-93 and
the Front Panel
⇒ Page 8-20.