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9.Using the tweezers (1), remove  the wiper blade as follows:
a. Pull the bottom of the wiper blade (2) to release.
b.Pull the wiper blade out from its slot from the top.
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10.Take a new wiper blade from the cleaning kit drawer.
CAUTION Hold the wiper blade (1) from the bott om rubber edge. Do not touch the top
edge (the blade).
11. Using the tweezers, insert the wiper blade as follows:
a. Insert the wiper blade into its slot so that  the bottom edge can be taken by the tweezers from
below the slot.
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b.From below the slot, pull the wiper blade  down so that it is fully inserted.
12.Close the right maintenance cover (1).
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13.Close the front cover (1).
The following message is di splayed on the front panel:
14.Select  YES and press the  OK key to confirm replacement.
When returning to the printer  after being switched off for an
extended period (l ess than two weeks)
WARNING!Never switch off the printer without follow ing the correct procedures. Even with the
storage liquid installed, never leave the printer off  for more than 4 weeks. Leaving your printer off
for more than 4 weeks can cause permanent damag e that cannot be repaired. In all other cases
make sure you observe the appropriate maintenance guidelines.
CAUTION If you need to leave the printer unatte nded for any reason, ensure that the printer
is on , the ink cartridges are full , media is loaded  and the waste ink bottle is empty , so that
automatic maintenance can be comp leted successfully for the time you are not present. If needed,
install new ink cartridges. The  ink cartridges that you replace  can be reused when you return to
your printer, if they still contain ink.
To clean the ink system, you will need the HP 780 Ink System Cleaning Kit (part number CB303A).
Clean ink system
This option allows you to clean dry ink from the ink system with cleaning liquid after the printer is powered
on after being stored for less than two weeks.
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CAUTIONDo not open or close the front covers or  change the position of levers while the
cleaning process is being performed or the operation may have to be restarted from the beginning.
This will result in the waste of the cleaning li quid. If the cleaning process has to be restarted,
new  cleaning liquid cartridges will be needed.
1. Press the  ONLINE key.
2. Press the  SHIFT key to display the  PH. MAIN menu.
3.Press the  key to select the  PH. MAIN menu.
4. Scroll to the  INK SYSTEM OPT  option and press OK.
5. Scroll to the  CLEAN INK SYS  option and press OK.
6. Press OK to confir m your selection.
7. When the front panel displays the waste ink bottle warning message, check whether the waste ink
bottle is present and ma ke sure it is empty.
CAUTIONYour waste ink bottle should be empty. Have available an empty waste ink
bottle.
8. Press the  OK key once the waste ink bottle has been checked and follow the instructions on the front
panel.
Install the Cleaning Liquid cartridges  when prompted by the front panel.
After cleaning the ink system, the ink charge  process must be performed (see How do I… Charge the inksystem).
Prepare for extended power  down (two to four weeks)
CAUTIONIf you physically need to relocate the printer to a new location, please contact HP
because this must only be done by a trained professional.
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CAUTIONNever switch off the printer  without following the correct  procedures. Even with the
storage liquid installed, never leave the printer off  for more than 4 weeks. Leaving your printer off
for more than 4 weeks can cause permanent damag e that cannot be repaired. In all other cases
make sure you observe the appropriate maintenance guidelines.
CAUTION The printer has an internal clock which allows it to automatically wash the printheads
and flush some ink through the printheads, whic h keeps the printheads in good condition. The
printer automatically washes  the printheads regularly after the la st printing process. If the printer
is switched off for a long peri od, this process does not happen.  If the ink does not flow through
the printheads from time to time, the ink will dry inside the nozzles reaching a point where it is
impossible to recover them and the printheads will  fail. If the printer must be switched off for a
long period of time, the customer must use either  the optional HP Ink System Storage or Cleaning
Kit to recover or protect the printheads.
Automatic maintenance and cleaning will not be per formed if you turn off the printer on the front
panel. The printer power switch on the rear of the printer should only be used when the printer is
turned off to move it, to connect it to a comp uter, or to install or maintain printer parts.
Before starting the ink system storage procedure, make sure you have available the HP 780 Ink System
Storage Kit and an empty waste ink bottle.
Ink system storage
This procedure allows you to empty  the ink system of ink and fills it with storage liquid that will preserve
the ink system if you do not intend to use the printer fo r a period of time (between two weeks and a month).
CAUTIONDo not open or close the covers or change  the position of levers while the ink system
storage process is being performed or the operati on may have to be restarted from the beginning.
This will result in the waste of the storage liquid. If ink system storage has to be restarted,  new
storage liquid cartridges will be needed.
1. Clean the ink system (see How do I… Clean ink system ).
2. Press the  ONLINE key.
3. Press the  SHIFT key to display the  PH. MAIN menu.
4.Press the  key to select the  PH. MAIN menu and press  OK.
5. Scroll to the  INK SYSTEM OPT  option and press OK.
6. Scroll to the  STORE INK SYS  option and press OK.
7. Press  OK to confirm your selection.
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8.When the front panel displays the waste ink bottle warning message, check whether the waste ink
bottle is present and ma ke sure it is empty.
CAUTIONYour waste ink bottle should be empty. Have available an empty waste ink
bottle.
9. Press the  OK key once the waste ink bottle has been checked and follow the instructions on the front
panel.
Install the Storage Liquid cartri dges when prompted by the front panel.
When you turn on the printer again, you will  have to clean the ink system (see How do I… Clean inksystem).
Charge the ink system
After the ink system has been cleaned,  then you will need to charge the ink system with ink. You will need
ink cartridges with more than 100 cc of ink available.
If any of the ink cartridges contain less than 100  cc of ink, a warning message is displayed on the front
panel. Install a correct ink cartridge that contains more  than 100 cc of ink in the indicated slot in order to
continue.
To charge the ink system:
1. Press the  ONLINE key.
2. Press the  SHIFT key to display the  PH. MAIN menu.
3.Press the  key to select the  PH. MAIN menu.
4. Scroll to the  INK SYSTEM OPT  option and press OK.
5. Scroll to the  CHARGE INK SYS  option and press OK.
6. Press OK to confir m your selection.
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7.When the front panel displays the waste ink bottl e warning message, check whether the waste ink
bottle is present and is  not full. Check the waste ink bottle and press the  OK key.
8. The Ink Charge process starts. Check whether  the waste ink bottle is present and is not full. Check
the waste ink bottle and press the  OK key.
When the ink charge process is co mplete, the front panel displays the  CHARGE INK SYS option.
NOTEDo not use the printer for at least one hour  after charging with ink. Check that the
wiper sponge is moist.
Clean the exterior  of the printer
CAUTIONTurn off the printer before starting to clean the exterior.
CAUTIONWipe the printer clean with a soft cloth.  A cloth moistened with a neutral detergent
may be used. Do not allow liquid to enter the printe r. This may create risk of fire and electrical
shock and cause a malfunction. Do not clean the printer with benzene or paint thinner. This may
damage the paint.
Clean the outside of the printer and all other parts of  the printer that you regularly touch as part of normal
operation as required with a damp sponge or a soft cl oth and a mild household cleaner such as non-abrasive
liquid soap.
Clean the carriage base
If there is banding on the print caused by smeared  ink on the carriage base you will need to clean the
carriage base.
1. Press the  ONLINE key to set the printer offline.
2.Press the  SHIFT key to display the  PH. MAIN menu.
3.Press the key to select the  PH. MAIN menu.
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4.Scroll to the  CAP CLEANING  option using the  key and press OK to select.
5. Press  OK again to confirm your selection.
The carriage will automatically move  to the left side of the printer so that the capping unit can easily
be accessed. The front panel displays  CARRIAGE MOVING — PLEASE WAIT  .
CAUTIONSome types of media are prone to cockling in the area adjacent to the heaters
if left stationary for any length  of time. Consequently it is good practice to feed approximately
20 cm of media through the printer before star ting the cap cleaning to avoid any possible
damage to the printheads that  could be caused by them touching any raised areas of the
media.
Once the carriage is out of the capping unit , the cleaning procedure must be done as quickly
as possible so as not to permanently dam age the printheads. The printer issues an audio
warning beep throughout the procedure.
6. When the following message is displayed, open the front cover (1).
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7.Open the carriage maintenance cover (1).
8.Clean the carriage base with a soft cloth.
9. Close the carriage maintenance cover (1) and close the front cover (2).
The printhead carriage will return to the right  maintenance area (home position) automatically.
NOTEUse the NOZZLE PRINT  to check that there are no prin thead nozzles out after cleaning
the carriage base.
Clean the front cover and media feed
NOTE Do not attempt to remove dust from media by  blowing it off. This may affect print quality.
CAUTIONWipe the printer clean with a soft cloth.  A cloth moistened with a neutral detergent
may be used. Do not allow liquid to enter the printe r. This may create risk of fire and electrical
shock and cause a malfunction. Do not clean the printer with benzene or paint thinner. This may
damage the paint.
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