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Preventive Maintenance
9-5
HP DesignJet CP Series printers
Cleaning the Electrical Contacts?
The problem.
The printer fires drops by sending electrical signals from the printhead
carriage to the printhead through the electrical contacts present on the
carriage and on the printheads. The problem is that when you load the
printheads into their stalls, sometimes some ink goes over the carriage
electrical contacts, and when the printhead is installed over the printhead
electrical contacts. When the printer prints, some ink goes to the bottom of the
electrical contacts. This causes electrical continuity problems that can be fixed
very easily.
The solution.
A new tool has been created especially to clean the electrical contacts and is
called the Ink Cleaner (Part Number C6247A - includes the instructions).
Scheduled Maintenance
In some segments of the printer market, the customer tends to print more
than the maximum number of prints that the throughput allows, exceeding
by far the limit of the design. When this happens the customer runs into
print quality problems and continuous Printer failures.
The purpose of scheduled preventive maintenance is to avoid these failures -
ensuring a good performance during all the product life.
Level of Printer Usage
Normal printer use means an average of 15 image prints with an area of
0.76 m
2
/print (8 ft.
2
/print) per day. If the prints are smaller than this, the
number of pages per day can be higher.
Under normal usage conditions, it will be approximately 5 years before the
printer needs maintenance. If the printer is used more than the normal
usage conditions, then it will need maintenance service much more
frequently.
One of the EEROM counters is assigned to counting the number of swaths.
When the printer exceeds 7,000,000 passes (HP DesignJets
2500CP/2000CP) or 6,000,000 passes (HP DesignJets 3500CP/300CP), the
front panel displays the following message:
“Maintenance Advised”
The Service Print also conveys the usage information, and it is accessible by
the user.