Head Carriage Adjustment; Head Module Retaining And Cam Screws - Tandon TM848-1 Operating And Service Manual

H. Verify that the smaller of the two Cats Eye lobes is not less than 75 percent in amplitude of
the other one. The calculation is:
I. Step the drive to Track 00, then, step it back to Track 38.
J. Reverify the Cats Eye pattern.
K. Step the drive to Track 76; then, step it back to Track 38.
L. Reverify the Cats Eye pattern.
M. On double-headed drives, select the upper head (Head 01) and repeat Steps F through L.
N. If any of the checks listed above does not meet the conditions stated in Step H, the head
carriage must be adjusted.
2.3

HEAD CARRIAGE ADJUSTMENT

A. Turn the tw o p o s ition retaining screws t hat s t raddle th e n y lon adjustment ca m l o cated
beneath the drive until the cam can be moved (see Figure 2-4).
OG
Is-
B. Observe the Cats Eye pattern from the head that is farthest out of alignment.
C. Using a flat blade screwdriver, turn the adjustment cam until one Cats Eye lobe is within 75
percent of the amplitude of the other lobe.
Check the upper and lower heads on double-sided drives (see Section 2.2.1, "F" through
"L" on upper head).
D. Tighten the two positioner retaining screws (see Figure 2-4).
am p o f smaller lobe
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-
p op
0 0

Head Module Retaining and Cam Screws

2-5
a mp o arger o e
POSITION RETAINING SCREWS (2)
ADJUSTMENT CAM
Figure 2-4
Note
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