Outline Of Mechanical Section - Teac MT-20D-IO Maintenance Manual

3-1-2 Outline of mechanical section
The mechanical section of this MTU (Magnetic Tape Unit) consists of a
magnetic head moving mechanism, tape drive mechanism, and various detection
mechanism, mainly the transport Sub Ass'y (sub assembly).
Each mechanism is assembled so as to keep the stable quality using high
precision parts, since compatibility is required between MTUs.
During maintenance, only the maintenance experts subjected to the specified
maintenance training should access the internal mechanisms.
In any case, never give excessive shocks to the main unit, but handle it
very carefully.
(1) Transport Sub Ass'y
The transport Sub Ass'y is the main frame to mount each mechanism or
PCB with the cassette tape loading/unloading mechanism as a center.
I t consists of a loading base (C) Ass'y, loading base (M) Ass'y,
lever base Ass 'y and loading arm Ass 'y, etc. centering around the
chassis.
The loading/unloading operation of the cassette tape is performed as
shown below.
(a) Loading operation
When the cassette tape is pushed in up to the front bezel, the
ejector on the loading base (C) Ass'y is moved in the direction of
insertion, and the cassette tape is attracted automatically
together with the ejector by the rotary force of the loading arm.
When the stopper of the ejector is released, the loading arm
begins to push the cassette tape and the loading base (C) Ass'y at
the right angle to the direction of insertion. When the loading
base (C) ASs'y reaches the predetermined position, the stopper of
the cam lever roller is released, and the reel motor within the
chassis is lifted together with the loading base (M) Ass 'y, and
then the MTU is placed in the cassette loading status (Fig. 302,
303).
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