Akai GX-A5

VI. ACTIONS OF SYSTEM CONTROL IC LM6504-145
6-1 ACTION OF FF AND RWD PLUNGERS
The FF and RWD plungers are controlled by the
“HIGH” and “LOW” signals at Pin @ and @ of
1C4 (LM6504-145), and the “ON” and “OFF” operation
of the FF and RWD plungers activates the mechanical
operation of each mode.
CONTROL
by IC4
PLUNGER
* The plunger is activated by the “LOW” control
signal from IC4 (LM6504-145) pins @ and @
OUTPUT SIGNALS
RWD Plunger Pin @
FF Plunger Pin @
Mechanical
Action
Fig. 6-1 TAPE SELECTOR OPERATION
6-2. TAPE SELECTOR OPERATION
When a cassette tape is inserted and the switches
SW901 and SW902 are turned ON or OFF, the
signal combination as shown in Fig. 6-2 will be
input through Pins @ and @ of the IC4
(LM6504-145). Through the combination of “LOW”
and “HIGH” at these input pins @ and @ , the signals
to contro! the REC equalizer, bias voltage, etc. will be
output from IC4 (LM6504-145) as shown in Fig. 6-3.
[Input]
T.S.IN METAL
Pin No.
T.S. IN CrOz
Pin No.
Each POSITION lights at “*L” output
* In Pin Nos. @ and @, same as in other switch
inputs, when the switch is pressed, the input to
Micro Computer is switched from “H” level to
“L” level.
[Output)
NORMAL
Fig. 6-2 INPUT
SERVICE MANUAL GX-A5/X
CrO2
Fig. 6-3 OUTPUT