This model featured a new chipset manufactured in Singapore that had a problem related to either overheating or data overload.Otherwise known as the ASIC issue, this meant the 615n card could fail without warning, and when it failed, would completely shut down, appearing to vanish from the printer entirely.

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EIO print servers will not work in LIO slots, nor will the LIO print servers work in EIO slots.

In 2002 HP released the 615n series of Internal EIO print server.

Jetdirect is based on HP's MIO (Modular Input/Output) interface, which was designed from the ground up with the IIIsi to create a mainstream full function high performance networked printer.

The initial MIO interface card had Ethernet and Token Ring physical layer variants and used various networking protocols over an AUI/BNC connection.

HP recommended to call them or contact them through the Web site and they will proceed to do some simple troubleshooting steps to determine if the failure is due to the chipset or some other cause.

If it is proven to be the chipset, HP would be able to replace the card under warranty with an as-new card (nominally a 620n).

Soon afterwards, HP began to do a per-item replacement policy that has ended as of October 31, 2008, when all known 615n cards were at least 4 years old and at such time HP felt it had taken appropriate corporate responsibility for a defect in manufacturing.

The 615n cards most often affected were the units installed in the Laserjet 2300, 4200 and Color 4600 series. Any 615n series card can fail, but it is up to HP to determine if the failure is due to the chipset or some other factor.

Initially, a printer needed a separate card for each protocol, such as TCP/IP, IPX/SPX, Apple Talk, or DLC/LLC.