Teac FD-55 Series, Maintenance Manual

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(a) Connect the SKA according to item 4-2-4 and set the FD PWR switch to
the PSA side,
(b) Start the spindle motor by key "5". (MON indicator turns on).
Install a work disk, and execute drive select by key "0*'. (DSO
indicator turns on).
(c) Key in feC0" and confirm that the TRACK indicator becomes ”00".
(RECALIBRATE)
(d) Key in "Cl" (SEEK TMAX)
(e) Key in "DS". (WRITE/READ LEVEL PRE 2F)
(f) Write 2F and read operations are repeated.
The DATA indicator ill 1 1 (mV) indicates the average read level
of TP7 and TP8 (Pre-amp.) after each cycle of operation (one rotation
of write and one rotation of read) is finished.
(g) Observe the DATA indicator I M l l (mV) with a slight depression
(very slight depression easy to release: 10 ^ 20g) by a finger on
the top of the upper head (double sided) or of the pad arm (single
sided).
(h) Confirm that the read level measured in item (f) is more than 80% of
that in item (g).
(i) For a double sided FDD, depress "F" key to stop and then depress
,"4H key to execute items (e) through (h) for side 0 and side 1 heads
respectively. The side is changed alternately by a depression of
”4" key. If side 1 is selected, SIDE 1 indicator of the SKA turns
on.
(2) SKA method
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