
3. MECHANICALSECTION
OPERATION
OUTLINE
Take-up
The operation outline of this unit is as follows:
l. Operationselection
system.....There is no power
assistmechanism
2. Driving system..... I motor belt drive
3. Head.....Fixedhead
4. Auto-stopsystem..... REC+PLAY andPLAY auto-
stop
5. Operationsystem..... Leverlock system
6. EJECTsystem..
... STOP-EJECT system
The following will describe
operationsaccordingto their
respectivemodes.
3.1. STOP
MODE
The head
chassisassemblyand therespectiveoperation
leverscomedown to their specified
positionsandbecome
into stop mode when the respectiveswitchesare OFF.
3.2. PLAYMODE
(l) When PLAY lever
ispressed.
thelock cammoves
to
the left direction and the power supply switch is
turned ON. At the same time, the head chassis
assemblywhich is linked to theplay leverispushed
up to the specifred
position with the head chassis
spring and the PLAY muting switch being turned
ON. In addition. the PLAY lever is locked with the
lock cam.
(2) At the same time, the head chassis.while rising
pushes
up the pinch pressure
contact
springwithin
the pinch roller arm to pressure
contactthe pinch
roller to the capstanand commencestaperunning
(3) At thesametime,
the PLAY idler isalso
pushed
up
causing
thetake-upreel
tableto rotate
and to begin
take-up
of tape and becomesinto PLAY mode.
Powersupply
switch
reel table seen
PLAY idler
frontsideof mechanism
Capsta
n
Pinch roller arm
Head chassis
spnng
PLAY muting SW
PLAY lever Pinchpressure
contact
spflng
Head chassis assemblv Headchassis
assembly
3-3. PLAY-STOP OPERATION
Mechanically, it operates in reverse of the afore-
mentionedPLAY mode.
(See
Figs.
3-l and 3-2.)
(l) When STOP leveris pressed,
the lock cam moves
in
theleft direction and releasesthe PLAY lever.At the
same time, the PLAY muting switch and power
supply switch are turned OFF.
(2) At the sametime, the PLAY idler is pushed down
while the headchassiscomesdown, and thetake'up
reel table stops as also the take.up of tape.
(3) At the same
time,release
the pressure
contactof the
pinch roller and capstan by pushing up the pinch
pressure
contact spring and stop the tape running
3-4. PLAY-PAUSE mode-PAUSE release
o PAUSE
mode
(l) When the PAUSE lever is pressed
in PL,AY mode,
the PAUSE lever pushes down the head chassis
assembly
(linked to pinch roller) which is linked to
the PLAY idler and PAUSE arm. At the same
timg
the PLAY idler and pinch roller are pressed
down
And with PAUSE cam, it is locked at the PAUSE
position and becomesinto PAUSE mode.
o PAUSE position
. Headcomes
down 1.7mm at centervaluefrom the
PLAY position
. Pinch roller doesnot contactwith thecapstan"
. PLAY idler doesnot contact
with the reeltable,
. Play muting switch and powersupplyswitcharein
ON mode.
. Clearance
of pinchroller: 1.7mm atcenter
. Clearance
of play
idler : 1.7
mm atcenter
Fig. 3-2. PLAY mode diagram
Leftdirection
Right
direction
STOPlever
Fig.
3-1.PLAYmode
diagram
(motor
installingside)