Tektronix Phaser 740, Service Manual

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Service Guide
17
Rear panel
The rear panel of the printer features the host interface connectors:
■
Bi-directional parallel (high-density connector). For the Phaser 750, the
parallel port can be used to connect to a qualified optical scanner.
■
Phaser 740 printer: Twisted Pair10baseT Ethernet connector.
Phaser 750 printer: Twisted Pair10/100baseT Ethernet connector.
RX indicator (green);
blinks while the network card is receiving data. The
LED is off steady while no data is being received. If the LED is on steady , then
a problem (probably hardware) has occurred at the network hub.
■
Phaser 740 printer only: SCSI high-density connector for connecting an
external hard disk drive or optical scanner only). The Phaser 750 printer
has no SCSI support.
■
Phaser 750 printer only: USB Type A connector for connecting to a USB-
compatible host.
With the addition of the appropriate network card, the printer can feature either of
these groups of connectors:
■
Phaser 740 printer only: ThinNet (100base2) and Twisted Pair (100baseT)
Ethernet connectors. RX indicator (green);
blinks while the network card is
receiving data. The LED is off steady while no data is being received. If the
LED is on steady , a problem (probably hardware) has occurred at the
network hub.
■
Phaser 740 printer only: LocalTalk connector.
■
Unshielded Twisted Pair (10baseT) and shielded Twisted Pair (DB-9) Token
Ring connectors. The Token Ring card installed disables the built-in
Ethernet port.
Test print button
In the center of the rear cabinet panel is the test print button. Pressing this button
while the printer is idle causes the print engine to print a built-in test print. The print
consists of a field of thin horizontal lines. The print is made independently of the
image processor board. Hold in the test button for at least 4 seconds before releasing,
or until you hear the print process begin. The print demonstrates that the print engine
can print (independently of the image processor); it has no use for determining print
quality.
Note
Phaser 740 printer: The Test Print button will not make a test print if
the auto-duplex unit is installed since the Test Print function defaults
to the upper tray.