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RESTRICTED USE ONLY Fargo Electronics, Inc.
HDP 800 Series Card Printer/Encoders Service Manual (Rev. 5.0)
462
Setting the Magnetic TOF
Use this setting to position the magnetic data at the correct distance from the leading edge of
the card.
• The Magnetic TOF is the distance from the edge of the card to the Start Sentinel (SS).
• The Start Sentinel marks the beginning of the encoded data. (Note: According to the
magnetic recording standard (ISO 7811), the correct Start Sentinel distance is 0.293
inches ± 0.020 inches (7.44 mm ± 0.51 mm) from the leading edge of the card.)
Step Procedure
1 a. Measure this distance by making the data visible using a magnetic viewer or
developer solution.
b. Alternatively, use a magnetic card analyzer to measure the Start Sentinel
distance.
2 a. Use a magnetic viewer or developer solution or spray to make the magnetic
data visible (in order to identify the Start Sentinel as the first set of magnetic
lines or first one-bit, which are visibly closer together than the large number
of evenly spaced lines or leading zero-bits that fill the space to the edge of
the card, as shown on the next page).
b. Use a magnifying device with a built-in measuring scale to measure the
distance from the edge of the card to the Start Sentinel in the data, as shown
on the next page.
3 If the Start Sentinel is too far from the leading edge of the card, reduce (or make
negative
) the Magnetic TOF setting needs.
OR
If the Start Sentinel is too close to the leading edge of the card, increase (or
make positive
) the Magnetic TOF setting needs.
4
Select MENU, Setup Printer and Magnetic TOF.
5 Adjust the setting by the amount determined by the following formula:
• 0.293 inches: Represents measured SS distance (inches) x 300 steps per
in.
OR
• 7.4 mm: Represents measured SS distance (millimeter) x 11.8 steps per
mm.
Example: (0.293 – 0.284) x 300 = 2.7