Avery Dennison SNAP 656 - Manual (Page 42)

36B • •• • Adjustments / Maintenance Users Manual Model 656/636
Print Head Replacement
NEVER REMOVE THE PRINT HEAD FROM THE PRINTER EXCEPT FOR
REPLACEMENT.
TURN OFF THE POWER TO THE PRINTER BEFORE STARTING ANY
ELECTRONIC COMPONENT REPLACEMENT.
NOTE: The Anti-static wrist strap (which must contact the skin and be tight) and
anti-static gloves must be worn at all times when handling a print head to avoid
damaging the print head.
1) Review the Printhead Handling Procedure Sheet packaged with each print head to
determine if any procedures have changed before beginning this procedure.
2) Remove the ink from the printer for easy access to the print head.
3) Remove the outer screw holding the static brush / guard and rotate the brush /
guard up to expose the print head cable connector on the print head.
4) Unplug the print head cable from the print head. Unplug the cable by gently
pulling it straight out of the connector.
5) Back the print head pressure screw off counterclockwise as far as possible.
6) Place your hand (with static gloves on) underneath the print line of the print head
and push up to release the locator pins on the heat sink, while moving the print
head to the right of the printer. This will remove the print head assembly from the
mount plate. You may need to "help" the print head out by pushing on the heat
sink with your left hand.
7) Remove the two print head mount screws located on the top of the print head
assembly with a 2.5mm ball driver.
8) Remove the old printhead from the heat sink.
9) Place the new print head into the heat sink. Check to see that the new printhead
sits square in the heat sink and that there is no endplay. If there is endplay, or the
head does not seat properly, the heat sink guide will need adjustment.
10) Replace the two print head lock screws. Be sure that the head is resting flat on
the heat sink before tightening these screws.
11) Replace the print head assembly in the printer, making sure that the pin at the
back of the heat sink goes into the hole in the mount plate. Make sure that the
guide pins insert into both the front and back grooves.
12) Reconnect the print head cable, making sure that the connector is seated tightly.
Swing the static brush / guard back into position and reinstall its mount screw.
NOTE: If the cable is not connected correctly, the print head will be damaged when
the printer is powered on. Check to see that the cable is tight by observing
from underneath the print head. The print head cable connector should be
inside of the black connector located on the print head.
13) Replace the ink and double-check your work. Power the printer on and make
sure that no adverse effects are noted.
14) Set the head category. Press the MODE key twice to get to the ENTER
PRINTHEAD SETUP prompt. Press the ENTER key, the press the MODE key
until the HEAD CATEGORY prompt appears. Use the keys to
select the head category. The head category is based on the mean resistance of
the print head being used. The printhead will have a value for the average