Videojet Printer EXCEL 170i

CAUTION: Ground the printhead to a metal service tray.

CAUTION: Wear safety glasses with side shields when working with fluids.

CAUTION: Ensure that the work area is well-ventilated.

CAUTION: Pour all unused fluids into a grounded, metal container.

CAUTION: Properly dispose of all unused fluids in approved containers and in an approved manner.

Enter a text message in the font you intend to print

Set <NOZZLE DRIVE> in Frame <04 SERVICE>. Set at 1% and increase until breakoff comes into view in charge tunnel window

Gradually increase nozzle drive level until the breakoff point reverses direction and begins to move toward the front end of the printhead (the point at which it reverses direction is foldback)

Lower nozzle drive below foldback and determine the print window (nozzle drive range that yields good print quality) using the following criteria: • satellites, if present, are forward-merging • number of satellites is three or fewer • breakoff point lies within charge tunnel • print quality is acceptable*

Cleaning the Printhead:This section describes how to clean the printhead.

When to Clean the Printhead:Clean the printhead at the start of every shift or work period.

Never clean the printhead at shutdown. By not cleaning the printhead at shutdown, a cap of ink is allowed to dry over the end of the nozzle. This ink cap keeps air from entering the nozzle and drying the ink. This helps prevent clogs in the nozzle.

Before starting this procedure, make certain that mains power to the printer is Off, and the mains power and compressed air supply to the printer are disconnected (unplugged). Failure to follow this warning may result in personal injury.

1. If you have not done so, press the OFF key to turn the printer Off. Allow the printer to complete its programmed four-minute shutdown sequence.

2. Turn the mains power switch Off. (Refer to Figure 6-1 for the location of the Mains Power Switch.)

3. Locate the screw that holds the printhead cover in place. (Refer to Figure 6-2.)

CAUTION: Ground the printhead to a metal service tray.

CAUTION: Wear safety glasses with side shields when working with fluids.

CAUTION: Ensure that the work area is well-ventilated.

CAUTION: Pour all unused fluids into a grounded, metal container.

CAUTION: Properly dispose of all unused fluids in approved containers and in an approved manner.

Press HEAD key to turn air control solenoid On

Turn < INK> On in Frame <02 SERVICE>

Align ink stream into ink return block

Preset ink pressure to 40 psi (2.8 bar) for ketone/alcohol or 50 psi (3.4 bar) for water/poly

CAUTION: Ground the printhead to a metal service tray.

CAUTION: Wear safety glasses with side shields when working with fluids.

CAUTION: Ensure that the work area is well-ventilated.

CAUTION: Pour all unused fluids into a grounded, metal container.

CAUTION: Properly dispose of all unused fluids in approved containers and in an approved manner.

Note: The following procedure may have to be repeated if the ambient temperature changes substantially.

Perform the printer calibration procedure to set the ink pressure.

Enter a text message using the font you intend to print.

Find the foldback nozzle drive level.

The following safety procedures are recommended for all procedures in this section.

Ground the printhead to a metal service tray. Refer to Chapter 2, Safety, in this manual for the recommended printhead grounding methods.

Wear safety glasses with side shields when working with fluids.

Ensure that the work area is well-ventilated.

Pour all unused fluids into a grounded, metal container.