Videojet Printer EXCEL 170i

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.)

Changing the Control Board Memory Battery

Important: The battery enables the control board to keep all stored printer values, messages and set-up information in memory. If the printer is turned Off and you remove the battery, all the values entered in memory will be lost. If you leave the printer On when you change the battery, none of the data will be lost.

CAUTION: You must be electrostatically connected to the printer chassis using a grounding strap. This prevents erasure of the program by static discharge.

Attach a wrist grounding strap to your wrist.

Locate the braided wire strain relief in the upper left corner of the cabinet where the umbilical cable enters the cabinet.

Attach the loose end of the grounding strap to the braided wire.

With the printer On (refer to Important: above), move the jumper on the pins at E74 to the pins at E79.

Remove the old battery and discard it.

Place the new battery in position on the control board.

Warning: 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.

Spread paper towels or absorbent rags on the bottom of the fluid pan to catch any ink that may spill during this procedure.

Remove the ink cylinder input line from the bottom of the existing ink filter.

Turn the existing ink filter anti-clockwise to remove it from the bottom of the ink cylinder top cap.

Caution: Do not use Teflon tape on the ink filter. Use caution when threading the filter into the top cap and ink cylinder input line to avoid cross-threading the filter.

Mount the new filter to the top cap of the ink cylinder. Carefully hand-tighten the filter into the top cap by turning it clockwise.

Connect the ink cylinder input line to the input end of the new filter.

Holding the filter in your hand, carefully tighten the nut with your fingers. Then use a 76\ wrench to tighten the nut an additional half turn. If the filter leaks during operation

Enter the number of hours the printer has been in operation

Is liquid visible in the vacuum filter?

Is proper vacuum difficult or impossible to maintain?

Enter the date of the vacuum filter change

Inline Ink and Make-up Replenishment Filters

Enter the number of hours the printer has been in operation

Are the replacement filters positioned exactly the same as the old filters?

Enter the date of the inline ink and make-up replenishment filters change

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