Akai VS-2EGN

6-5-4 PAUSE REMOTE CONTROL
The PAUSE remote control provides control over REC
R. PAUSE and PLAY<+P. PAUSE through switching
between HIGH and LOW.
;— The rising edge converts REC mode to REC pause
— or PB mode to PB pause.
—_. The falling edge converts REC pause to REC mode
‘or PB pause to PB mode.
With HIGH (PAUSE) selected, depressing the key REC/
PLAY on VTR results in R. PAUSE/P. PAUSE. With
LOW (REC/PLAY) selected, the key on VTR itself is
accepted just as when the PAUSE remote control ter-
minal is disconnected.
6-5-5 POWER SUPPLY CONTROL
UNREG 19V
AL 12v
PB ZV
O+-“yecs3ec
t
39
R38
~ Fig. 7-105 IFR Power Supply Circuit
The key depressed on the front panel or remote con-
trol command éntered is tested to turn on/off power
supplies (AL12V, AL15SV, PB12V, EE1SV and REC
12V).
When the mode in which PB12 is to be sent out is es-
tablished, PB goes to “LOW” and pin (4) of IC6 also
goes to “LOW” which in turn activates TR13, causing
PB12V to be supplied. The purpose of C37 is to prevent
PB12V from being turned on/off abruptly.
Further, the purpose of R32, R38 and C39 is to set pin
@ of IC6 forcedly to “HIGH” for a period of time as
determined by the time constant of R32 and C39, so as
to prevent PB12V from being sent out until RESET is
applied to the microcomputer after MAIN POWER on
the rear is turned on.
Note that EE15V and REC12V are also controlled using
the same circuit configuration.
6-5-6 REEL MOTOR POWER SUPPLY CONTROL
ALIS
ORM PWR
Fig. 7-106 Reel Motor Power Supply Circuit
As with VS-5, the reel motor is controlled through
torque switching by means of three control lines RM-Hi,
RM-Mid and RM-Lo. The torque varies depending on
whether
the
motor
is
driven
directly,
via
a
100
ohms
resistance
(R14),
or
via
a
120
ohms
resistnace
(R15).
1) At FF/REW time ...... RM-Hi (Low)
; to be driven directly with TRS and TR4,
2) At Review/AEC rewinding/Memory-stop rewinding
time... . RM-Mid + RM-Lo (Both are Low)
; to be driven via R14//R15
3) At Unload time ....... RM.-Lo (Low)
; to be driven via R15.
6-5-7 SERVO POWER SUPPLY AND DRUM HEATER
CONTROL
If the SERVO terminal is at “HIGH”, TR9 and TR8
are kept OFF, resulting in no power being supplied to
the servo PCB, whereas TRIO and TR11 are activated,
causing the drum heater to be energized. When the
SERVO terminal goes to “LOW”, TR9 and TR8 are acti-
vated, causing SRV19V to be supplied to the servo PCB,
whereas TR10 and TR11 are deactivated, resulting in
the drum heater being turned off. In other words, the
power is supplied to the servo PCB only in the mode
where the drum motor rotates, while the power supply is
cut off in the mode where the motor does not rotate (in
this case, the drum heater is tured on).
OO
Service
Manual
VS-2EGN
75