Teac FD-55 Series, Maintenance Manual

Page: 131 / 216

(A) Equipment
(1) Cross point screwdriver, M3
(2) Alignment disk
(3) Alignment adjustment jig or M3 screw of 15mm long . . '
(4) SKA or user * s system
(5) Oscilloscope
(6) Hygrometer.
(7) Locking paint
(B) Check and adjustment procedure
Note: Check and adjustment of track alignment should be done in an
environment of general room temperature and humidity. Even if the
environmental condition is within the specified operational condition,
extreemly high or low temperature, or extreemly high or low humidity
should be avoided. Check and adjustment should be done after two
hours, Min. of storing in the above mentioned condition.
It is recommended that the orientation of the FDD for the track
alignment check is the same as when the FDD is actually installed
in the user's system.
(1) General method
(a) Use two channels of an oscilloscope and connect them to T P 9 and TP10
(Differentiation amp.) on the PCBA MFD control- Also connect
the external trigger of the oscilloscope to TP4 (Index) and apply
positive trigger.
Oscilloscope range 48tpii AC mode, 0.5V, 20msec
96tpi: AC mode, 0.2V, 20msec
Set both channels, 1 and 2 to the above range. Set either of the
channels to Invert mode and Add both channels.
4-4-13. Check and Adjustment of Track Alignment
4093