C-2 Appendix C: Service Diagnostics
1. Scan the Diagnostic Mode tag to enter the Base Diagnostic state—this must be the first
tag scanned after applying power to the 7893.
2.
Scan the Hex 4 tag, then the Hex A tag to read the firmware version level.
3.
At this point, the scanner begins speaking the firmware version. The Scanner speaks
"Version Two Scanner 4 9 7 x x x x x x x", where the x x x x x x x refers to the firmware
release number.
4.
After taking a note of the firmware version, the scanner must power cycle (power off, then
power on) to put it back into operational state. A Reset tag may be used.
Toad Test
The Toad test checks the scanner's ability to read UPC bar codes in various parts of the scan
pattern. The test repeats until ended by removing power from the 7893.
1.
Scan the Diagnostic Mode tag to enter the Base Diagnostic state—must be the first tag
scanned after applying power to the 7893.
2.
Scan the Hex 1 tag to enter the Toad test mode.
3.
Position a good UPC or EAN tag within the scan pattern.
a.
The green LED Status Indicator displays and the Good Read tone sounds off if the
scanner can read the bar code.
b.
The red LED Status Indicator displays if the scanner cannot read the bar code.
4.
Repeat Step 3 for various areas of the scan pattern.
5.
Remove power from the 7893 to end this test.
Possible Bad Components
Optics Engine
Digital Board
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