Akai VS-2EGN

4-1-7 LOADING MOTOR DRIVE CIRCUIT
TR2 COLLECTOR
TR3 COLLECTOR
1C3 BA6IOD
RES
R22
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Vout 260)
ai -(F)
vz2 3
7 ot
vi @ * 7
3
Vout | (2 ] ay
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CM FG O
CM FG O
Fig. 7-75 Loading Motor Drive Circuit and Capstan Motor Control Circuit
The upper half of Fig. 7-75 is the loading motor drive
circuit. The power supply is obtained from AL 15V.
When LM STP from the SYS-CON is HIGH, D4 and D5
conduct, and outputs Vout 1 and Vout 2 become LOW
regardless of M RVS, causing the loading motor to stop
rotating. When LM STP becomes LOW, D4 and D5
cease conducting, HIGH/LOW of Fin and Rin is deter-
mined by M RVS, so that NORMAL/REVERSE is con-
trolled. TRS is for determining the output volt-
age, so that about 10.5V is applied to the motor.
THI and TH2 are posisters (Positive temperature coef-
ficient thermistors) for preventing abnormal heating of
IC, transistors, resistors, etc. in the event of a short
circuit, by means of limiting the current.
Service Manual VS-2EGN
60
4-1-8 CAPSTAN MOTOR CIRCUIT
The lower half of Fig. 7-75 is the capstan motor cir-
cuit. CM+ and CM— are supplied from the servo cir-
cuit, and connected to the capstan motor after passing
through the respective relay and filter.
In the REVIEW mode, relay RL1 is ON, so that the
CM+ and CM— connections are reversed, and hence
the capstan motor muns in the reverse direction.