Index Adjustment; Compliance Check And Adjustment; Compliance Check - Tandon TM-100-1 Operating And Service Manual

2.3.1.9 For double-sided disk drives, if Head 00, the lower head , meets the specification, check Head 01 , the
upper head.
NOTE
Head 01 sh.ould meet the same specification.
2.3.1.1 O If either Head 00 or Head 01 does not meet the specification, adjust the index sensor (see Section
2.3.2.1 ).
2.3.1.11 Recheck both indexes after they are adjusted.
2.3.1.12 When both index measurements on a double-sided disk drive or the one index measurement on a
single-sided disk drive meet the specification, check the index on Track 34.
2.3.1 .13 On a double-sided disk drive, check Heads 01 and 00, the upper and lower heads.
NOTES
If any index measurement does not meet the specification, the index
sensor must be adjusted (see Section 2.3.2 .1 ).
If the index measurements meet the specification, the index sensor
does not need to be adjusted.
2.3.1.14 Recheck all indexes after each adjustment.
2.3.2 Index Adjustment
2.3.2.1 From the bottom of the chassis, lossen the index sensor's retaining screw counterclockwise one-
quarter (1 /4) turn (see Figure 2-9) with a Phillips screwdriver.
2.3.2.2 Adjust the index sensor with a flat blade screwdriver until the data pulse begins 200 usec
± 100 usec
from the trigger point.
2.3.2.3 Tighten the index sensor's retaining screw with a Phillips screwdriver.
2.3.2.4 Verify the indexes.
2.4 COMPLIANCE CHECK AND ADJUSTMENT
Compliance is the maximized output of the magnetic head when the pressure of the felt pressure pad is centered
over the read/write gap. For single-sided disk drives, a compliance check and adjustment can be made in the
field. For double-sided disk drives, a compliance check and adjustment must be made at the factory.
2.4.1 Compliance Check
2.4.1 .1 Rest the disk drive on its cast base.
2.4.1.2 Remove the two (2) screws that attach the Logic PCBA to the guide rails.
2.4.1 .3 Lift out the Logic PCBA, and lay it on the disk drive.
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