Teac MT-20D-IO Maintenance Manual page 174

Ferrite head
(3) Replacement procedure
(a) Remove the protector guide in accordance with item
4-2-3 (1).
(b) Extract the connector
J6.
(c) Remove the head screws, detach the head Ass'y from the base (Fig.
435) .
At this time, keep the insulation sheet between the head and base
attached onto the base.
Remark If the insulation sheet is attached to the head Ass'y
together, strip it with tweezers.
(d) Attach the new head Ass'y in the reverse procedure to the above.
Remarks
1. Attach the head Ass'y so that it is pressed to the
cassette side against the positioning pins on the
base.
2. Be sure to tighten screws with the tightening torque
of 1.5 kg.em.
(e) Connect the connector
J6.
(f) Detach the PCBA Interface Control in accordance with Item
4-4-10.
(g) Check and adjust the head alignment in accordance with Item
4-3-8.
(h) Check the AGC operation in accordance with Item
4-3-9.
(i) Check and adjust the read preamplifier level in accordance with
Item
4-3-14.
(j) Check and adjust the read level in accordance with Item
4-3-15.
(k) Check the feed through in accordance with Item
4-3-16.
(1) Check for the resolution in accordance with Item
4-3-17.
(m) Check for the erase level in accordance with Item
4-3-18.
(n) Check the peak shift in accordance with Item
4-3-19.
(0) Check the asymmetry in accordance with
4-3-20.
(p) Attach the PCBA Interface Control in accordance with
4-4-10.
(q) Attach the protector guide in accordance with Item 4-2-3.(2).
(r) Perform the overall check in accordance with Item
4-3-22.
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