1-17
Troubleshooting
HP Designjet 4000/4020 Printer Series Service Manual
3 The Printer is up and running, or may have a System Error at the end of the
power-up sequence. For the Carriage PCA connection, perform the Scan-
Axis Test
⇒ Page 4-7:
4 On the PrintMech PCA, if the 3V3 LED is ON, 5V LED is ON, ERIDANI LED
is ON, VAUX LED is ON and the VAN LED is OFF, then try the following:
îš„ Run the Electronics Module Test to further diagnose the problem.
 Replace the PrintMech PCA ⇒ Page 8-119.
5 If the Power Switch LED is Green and the 3V3 LED is ON, 5V LED is ON,
ERIDANI LED is ON, VAUX LED is ON, VAN LED is ON and the VPOWER2
LED is OFF, then try the following:
îš„ Check the connection between the PSU and the PrintMech PCA.
îš„ Run the Electronics Module Test to further diagnose the problem.
 Replace the PrintMech PCA ⇒ Page 8-119.
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.
24V ON ON
Blue
and
Green
îš„ Check the System Error that is
produced and run the corresponding
Diagnostic Test (either Scan-Axis or
Media-Axis Test.
24V OFF OFF
Blue
and
Green
îš„ Check the connection between the
PSU and the PrintMech PCA and
Interconnect PCA.
îš„ If connection OK, run the Electronics
Module Test to further diagnose the
problem.
24V OFF ON
Blue
and
Green
îš„ Check the connection between the
PSU and the Interconnect PCA.
îš„ If connection OK, run the Electronics
Module Test to further diagnose the
problem.
24V ON OFF
Blue
and
Green
îš„ Check the connection between the
PSU and the PrintMech PCA.
îš„ If connection OK, run the Electronics
Module Test to further diagnose the
problem.
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