Specifications
Page 3-8 105SL Maintenance Manual 32056L Rev. 2 12/4/01
SECTION 3 TROUBLESHOOTING
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Additional diagnostic tests are available for printhead assembly adjustments. These
diagnostic tests are only accessible when the data interface cable is disconnected from the
printer and a loopback connector is attached in its place.
The serial loopback connector is a 25-pin or 9-pin “D” Type Male with the following pins tied
together:
The parallel loopback connector is a standard 36-pin parallel connector mounted to a small
printed circuit board. This connector is available from Zebra Technologies as part # 44681.
For each of these diagnostic tests, the printer “transmits” the test label format out of the data
interface connector to the loopback connector. The loopback connector passes the test label
format to the printer as “received data” and the test label is printed.
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This test demonstrates the media movement capabilities of the printer and provides a test
label to view while making print quality adjustments.
With the loopback connector in place, press the PAUSE key while turning the power switch
ON.
After the Power-On Self Test, the printer prints 500 head test labels. Each series of labels
backfeeds prior to printing and feeds to the rest position after printing if the printer is PAUSED
and the PAUSE key is pressed.
A serialized number prints on each label for label comparison purposes if required. See label
example in Figure 3-6. The PAUSE key can be used to stop and restart the printing operation.
• Pins 2 and 3
• Pins 4 and 6
• Pins 7 and 8
• Pins 2 and 3
• Pins 6 and 20
• Pins 13 and 14
• Pins 16 and 19
Figure 3-6. PAUSE Key Loopback Test Sample Label
DB-9 Connector (Solder Side)
DB-25 Connector (Solder Side)