Akai X-360D

7. REVERSE PLAY
a) Normal—-———Reverse
@--—0o,-= s— Reverse ‘‘ON” (Button or Dial)
{ ——C552 charges(220zF).
5mS4--
| OmS
|5mS4------- REV.! ‘‘ON’’ (Main Motor Starts
20mS : PT “ON” Reverse rotation. )
30mS
4
----
PLY.
“ON”
'
40mS |
ie MAG. “ON”
0.58. -- —~7~ REV.H ‘ON’ (P.B.Head held down
’ to Reverse position.)
i
' :
— P.T. kept ‘“‘ON’’ condition.
'
hiss PT “OFF”
4.01 58.4-—--7 >> REV.2, REV3, QT, BRK, PR are
“ON”
time
Fig. 7
Sequence of operation when. the REVERSE Button is
depressed, or when the White Mark on the Tape Count
Meter reaches the Black Arrow of the Reverse Set Dial as
follows for Automatic Reverse. Assuming this is point
(A), Figure 7 shows Relay and Solenoid operating
sequence beginning at this point.
Relay operation can be clearly understood by referring
to the System Contro] Board Block Diagram (Figure 8.).
As soon as REVERSE is actuated (‘‘ON’’) at point (A),
current begins to flow in the Reverse Circuit. Since it
takes about 15 milliseconds before the contact is
operative, C552 (220 wF) is charged within approxi-
mately 5 milliseconds through REV1-2 (normally closed
contact).
26
15 milliseconds later, REV1 Relay is actuated (“ON’’)
and the normally closed contact of REV1-2, is opened,
220 uF is discharged through the 10 2 Resistor and the
PT Relay. The PT Relay remains engaged and the pinch
roller disengages during the 4-second Discharge Time.
The REVI Relay is actuated (“ON’’) during this 4
seconds, starting the Main Motor rotating in the reverse
direction. PLY and MAG Relays are actuated (“ON”),
permitting current to flow to the Left and Right Reel
Motors. The REV. H Solenoid is actuated (“‘ON’’), the
Playback Head lowers to its REVERSE position. The PT
Relay is now cut off, and the pinch roller engages.
Approximately 15 milliseconds later the REV2, REV3,
and QT Relays and the BRK and PR Solenoide’ are
actuated (“‘ON’’), causing the tape travel to REVERSE.