MacDermid ColorSpan 5440 Technical Training Manual - page 29
printer electronics to allow pressure to be applied. The normal state of the valve
is open, allowing the vacuum to act on the ink in the printheads.
Service Station
- Height & Position: for effective wiping, the carriage position and service station
height must be properly calibrated. Use the embedded software routine to cali-
brate.
- Wiper Condition: since wiping occurs only periodically (on average, less than
once per print job), the wipers will wear slowly. Inspect the wiper blades periodi-
cally for wear, but more importantly for any build-up of ink solids that should be
wiped away. Use the same wipes as for the printheads themselves, to avoid
transferring lint of paper dust to the printheads.
- Wiper rails: the two round rails that guide the wiper head in the Y-axis (front to
back) will become sticky if contaminated with ink. This will inhibit wiper-head mo-
tion and the printheads may not be serviced correctly by a Purge, and will show
many missing jets in the Prime Bar pattern. Clean the rails with isopropyl alcohol
and apply grease from FRM 0900854.
4. Electronics Assembly
The electronics assembly is the complete command and control center of the printer.
Rasterized images and all functions go through and are processed by the electronics.
The most important thing to consider with the electronics is that the proper voltage is
coming into the machine without excessive fluctuation. The printer will not work properly
with a fluctuating line voltage The electronics assembly consists of these components:
- Motherboard - The motherboard is a standard Intel-class part. It holds all the
daughter boards/cards, the processor, RAM, and attendant computer components.
The onboard ethernet port handles VideoNet communications with the server.
- I/O board - The I/O board is responsible for coordinating all electrical and electronic
functions of the printer. It must send correct voltages to the various motors, retain
registration data and user configurations, and the embedded printer software. Regis-
tration data and all other user settings are stored on the I/O board.
- ATX power supply - Powers motherboard and all other computer-like components.
- 24-volt power supply (integrated with 36-volt supply) - The 24-volt power supplies
provides voltage to the vacuum fans, the pressure pump, the enclosure cooling fans,
the carriage drive motor, the rail height motors, the camera board, the air valves, and
a variety of other sensors and relays.
- 36-volt power supply (integrated with 24-volt supply) - The 36-volt power supply
provides voltage to the media drive motor, the printhead heaters, and the printhead
jets.
- Power distribution board
- AC relays (qty. 2) - controls power to the service station vacuum and the ionizer
bars. The service station vacuum is powered only during the Purge or related ink
5400 Technical Training Manual
MacDermid ColorSpan Confidential
Page 25 of 39
MacDermid, Inc. 11311 K-Tel Drive, Minnetonka, MN 55343
Phone: 952-944-9457 Fax: 952-944-8507