Theory Of Operation - Teac MT-20D-IO Maintenance Manual

3-6-2 Theory of operation
Description is given below on the circuit operation of each block shown in
Fig. 329(a).
The circuit description of the LSI type is omitted herein, because it is
nearly the same as in the discrete type.
(1) Initial control
The INITIAL CONTROL CIRCUIT controls the initialization of each part
of MTU, and subsequent operations due to Power ON (with the cassette
loaded), cassette loading, or by a reset signal from the BASIC
I/F.
After the completion of initialization, it is not operated until the
following reset conditions are met.
~~~I ------:!~-:~I_C_~_ET_S~_T_L_...JIJ---------
OST
GOD - - - - - - - - - -
I
HOLD - - - - - - - - - - -
INITIAL
CONTROL
- - - - - - - - - - - - - PRDY
I
- - - - - - - - - - - - - SPEN
INITIAL CONTROL CIRCUIT
Fig. 330 Initial control
- 354 -