Akai X-360D

1.
Relays & Solenoids Actuated for Each Operation
Function
Normal Play
Reverse Play
Recording
remreme | P| |
pe PP
O mark indicates ‘‘engaged”’.
STOP
Load a tape and depress the Power Switch. Current
flows as indicated by the red line in Figure 2, driving
the Main Motor in the normal direction, and lights
the VU Meter Lamp.
PLAY
With the Recorder set to STOP, depress the
FORWARD Button. Current flows as indicated in
Figure 3, actuating the PLY, QT, and MAG Relays
and the P.R. and BRK Solenoids. Tape is fed in the
normal (forward) direction at a constant speed as
current is supplied through R201 and R206 to Left
and Right Reel Motors. To provide increased start-
ing torque for the Reel Motors, the QT Relay is
actuated approximately 0.2 second after the
FORWARD Button is depressed, partially shorting
R201 and applying higher voltage to the Take-up
Motor. The Block Diagram clearly show the opera- .
tion of the individual relays.
FAST FORWARD
When the FAST FORWARD Button is depressed,
current {lows as indicated in Figure 4, actuating the
FF, MAG, QT, and TIM Relays and the BRK
Solenoid. 100V is supplied to the Take-up Motor,
and 13V is fed to the Supply Motor through R203,
for back tension application during FAST
FORWARD feed.
REWIND
When the REWIND Button is depressed, current
flows as indicated in Figure 5, actuating the RWD,
QT, MAG, DS, and TIM Relays and the BRK
Solenoid. 100V is supplied to the Supply Motor and
13V is fed to the Take-up Motor through R203, for
back tension application during REWIND.
20
Magnetic Brake
When the STOP Button is depressed during FAST
FORWARD or REWIND, the Magnetic Brake
smoothly and quickly stops the fast moving tape.
a) When the STOP Button is depressed during
REWIND, Condenser C44-7 (10 pF) is dis-
charged through VR44-1 (100K &) and R44-4
(6.8K Q), as shown in Figure 6.
Discharge Time Constant is 2 seconds with —
SW102 set to STANDARD, or 4 seconds when
set to 1 or 1/2 mil. During discharge Tr44-1
(2SC372) and Tr44-2(2SC728), as well as TIM
and DS Relays remain engaged. 65V AC is
supplied to the Take-up Motor through R205
(400 ©) and DC current is’ supplied to the
Take-up Motor Sub Coil through R205(1K Q)
and Diode (10D4), allowing the Take-up Motor
to serve as a Brake.
b) When the STOP Button is depressed during
FAST FORWARD, the TIM Relay remains
engaged, and supplies hoth AC and DC to the
Supply Motor which serves as a Brake for the
fast moving tape. When the Magnetic Brake
Contiol Switch SW-102 is sel tv 1 or 1/2 mil,
D44-11 and R204 are cut out from the circuit
and AC only is supplied to the Motor.
Because the Brake Band only assists the
Magnetic Brake, Brake Tension (Braking Power)
applied by the Brake Band can be of a
_ comparatively smaller value than usual.