HP Designjet L25500 Printer series - Page 57

Using the PCA LEDs to Troubleshoot 49
Troubleshooting
Interconnect PCA
To view the LEDs on the Interconnect PCA first remove the cover secured with six T-10 screws.
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 a fuse on the PrintMech PCA.
VPOWER2 - Comes from the PSU (42V) after a fuse on the Interconnect PCA. Used to power the Carriage
PCA. Should be ON at the same time as Green Power Switch LED.
PrintMech PCA
The following illustration shows the locations of the LEDs on the PrintMech PCA.
DS7: 5Vsb - Comes from the PSU after the fuse on PrintMech PCA.
DS1: 3V3 - Comes from the Power Supply Unit.
DS2: 5V - Comes from the Power Supply Unit.
DS3VPOWER2 - Comes from the PSU (42V) after a fuse on the PrintMech PCA.
DS5: VAUX - Comes from the PSU (12V) after a fuse on the PrintMech.
DS7: 5Vsb - Comes from the Power Supply Unit
Interconnect PCA
DS5: 5V
DS3: 5Vsb
DS1: 24V
DS4: VPOWER2
DS3: VPOWER2 42V
DS7: 5Vsb
DS1: 3V3
DS2: 5V
DS4: 24V
DS5: VAUX=12V
Note: LED DS7: 5Vsb is
a little difficult to see,
however if you look into
the printmech from the
position shown here,
you should see it.