Akai VS-2EGN

1c | MS4532P
TOP view
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Fig. 7-71 IC1 Block Diagram
GND
Fig. 7-72 Equivalent Circuit of Inverter
4-1-5 REEL MOTOR/LOADING MOTOR DRIVE IC (BA6109)
Fin_| Rin [Vout #|vout 2|
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Fig. 7-73 IC BA6109 Block Diagram and Truth Table
BA6109 has three output modes of NORMAL, RE-
VERSE, and STOP corresponding to two input logics
(Fin, Rin), and it determines the direction of motor
rotation. The use of a relay has become unnecessary
thanks to the use of this IC.
4-1-6 REEL MOTOR DRIVE CIRCUIT
CAUTION
When a short-circuit occurs between POWER (pin ®,
pin (8) or GND (pin @® and an output terminal (pin
> pin ), or between the output terminals (pin
> pin ), the load of the output transistor be-
comes. almost zero ohm, and a large current above
1A will flow through the IC, destroying the IC.
“H" When PLOW
ALIS
Fig. 7-74 Reel Motor Drive Circuit
Fig. 7-74 shows the reel motor drive circuit. When
RM PWR is fed from the SYS-CON, NORMAL/RE-
VERSE is determined by Fin and Rin at that time,
and a current is fed to the reel motor (RM). Fin and
Rin are generated by TR2 and TR3 from the M RVS
information from the SYS-CON. In the mode where the
reel motor does not turn rotate, the signal may be Fin or
Rin.
TR4 is for controlling the output voltage of BA6109,
and limits the output voltage during the period of 0,3
second from the reel motor rotation start to the time
that the plunger draws about 3V. As the plunger is
operated, TR4 is switched OFF, and the output is
determined by RM PWR
Service Manual VS-2EGN
59