When the PHA is empty when replaced. The system uses the startup routine to ll the PHA and prepare it for
the rst page of printing. When performing a PHA replacement it is necessary to have enough ink in the
cartridges, as prompted by the front panel. As noted in the section on the RIDS (Ink Tubes) on page 494;
when the tubes are empty, a new, empty printhead must be used.
NOTE: HOT SWAP is not allowed: If the PHA is replaced with the printer turned ON, there is a risk of Main
PCA damage if the printhead replacement front panel procedure is not followed.
Electronics
The PHA is controlled through the carriage PCA and trailing cables to power the printhead and transmit data.
It is connected on the backside of the carriage.
ENWW Subsystems 13
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