Akai GX-M10 User manual

I SERVICE MANUAL
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STEREO CASSETTE DECK
MODEL GX-M!1 Oo

STEREO CASSETTE DECK
MODEL GX-M 1 0
ALSO APPLICABLE TO BLACK PANEL MODEL
SECTION
1
SERVICE
MANUAL
....................
3
SECTION
2
PARTS
LIST
............
000s.
esas
ceeee
35
SECTION
3.
SCHEMATIC
DIAGRAM
................
51

SECTION 1
SERVICE
MANUAL
TABLE OF CONTENTS
I.
TECHNICAL
DATA...
2.0.2
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tenet
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en
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eenes
4
I
DISMANTLING
OF
UNIT
......6
0.
0cceceeeeeesteeeeteeeesees
5
Wil:
-CONTROLS
ccc
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Pah
a
tenensaeesd
ats
cal
ce
trata
6
IV.
PRINCIPAL
PARTS
LOCATION
.........55.0+0
00005:
snsehcahanes
7
V.
VOLTAGE
AND
CYCLE
CONVERSION
..........0020000
000s
ava
8
i:
VOLTAGE
CONVERSION
a.s0:5:k4
Okc
voto
toneeoseeatenes
8
A
CVGLE
CONVERSION
cia
yids
Scion
dd
vbe
teh
bame
dn
et
ar
ee
8
VI.
IPSS
CIRCUITRY
OPERATION
EXPLANATION
.........2--0+0
0005
9
VIL
TIMER
START
SWITCH
OPERATION
...........000
00s
ee
seers
17
VIN.
AUTO
STOP
MECHANISM
OPERATION
.........0-.000
0
ee
eres
18
IX,
MECHANISM
ADJUSTMENT
.........0-
00.0
0ee
secu
eeeee
eens
20
X.
HEAD
ADJUSTMENT
..........00000
eee
cere
Lada
eeu
eaies
22
XI.
AMPLIFIER
ADJUSTMENT
.......
Selon’
S
fclasde
ace
aaa
ahecontetonitat
e
_
XII.
DC
RESISTANCE
OF
VARIOUS
HEADS
.......---
00-000
ee
ee
eees
28
XIII.
CLASSIFICATION
OF
VARIOUS
BC
BOARDS
&:
sebas
eeetieeiaws
28
For
basic
adjustments,
measuring
methods,
and
operating
principles,
refer
to
GENERAL
TECHNICAL
MANUAL.
.
:

1.
TECHNICAL
DATA
nn
nn
EEE
EESss
EES
TRACK SYSTEM
4 track 2 channel stereo system
TAPE
Philips
type
cassette
TAPE
SPEED
4.76
cm/s
+
1.5%
(1-7/8
ips.
+
1.5%)
.
HEADS
(2):
Erase
head
x
1
ite
Twin
field
Super
GX
head
x
1
MOTOR
(1):
Electronically
speed
controlled
DC
motor
WOW & FLUTTER
i Less than 0.04% WRMS. 0.14% (DIN 45500)
TAPE WINDING TIME
90 sec. using a C-60 cassette tape
FREQUENCY RESPONSE
LN 30 to 15,000 Hz + 3 dB (-20 VU)
LH 30 to 16,000 Hz + 3 dB (20 VU)
CrO, (SA) 30 to 16,500 Hz + 3 dB (-20 VU)
30 to 8,000 Hz + 3 dB (0 VU)
Metal 30 to 19,000 Hz + 3 dB (-20 VU)
30 to 12,000 Hz + 3 dB (0 VU)
SIGNAL
TO
NOISE
RATIO
LN better than 58 dB
LH better than 59 dB
CrO,(SA) better than 60 dB
Metal better than 61 dB
(Measured via tape with peak recording level)
Dolby
NR
switch
ON:
Improves
up
to
10
dB
above
5
kHz
HARMONIC
DISTORTION
CHANNEL
SEPARATION
LN less than 0.8%
LH less than 0.8%
CrO, (SA) less than 0.7%
Metal less than 0.6%
27 dB at 1,000 Hz ©
ee
ee
CROSS TALK
60 dB at 1,000 Hz
INPUT
MIC:
0.3
mV
(Input
impedance
5.0
kohms)
Required
microphone
impedance:
600
ohms
Line:
70
mV
(Input
impedance
47
kohms)
OUTPUT
Line:
410
mV
at
0
VU
;
Required
load
impedance:
more
than
20
kohms
Phone: 100 mV/8 ohms at 0 VU
DIN
Input:
2.0
mV
(Input
impedance
10
kohms)
Output:
410
mV
Required
load
impedance:
more
than
20
kohms
DIMENSIONS
440(W)
x
143(H)
x
250(D)
mm_=
(17.3
x
5.6
x
9.8")
WEIGHT
6.0
kg
(13.2
lbs)
POWER
CONSUMPTION
POWER
REQUIREMENTS
7 12 W
100V, 50/60 Hz for Japan
120V, 60 Hz for U.S.A. & Canada
220V,
50
Hz
for
European
countries
except
U.K.
240V, 50 Hz for U.K. & Australia
110/120/220/240V
switchable,
50/60
Hz
for
the
other
countries
*
For
improvement
purposes,
specifications
and
design
are
subject
to
change
without
notice.
*
“Dolby”
and
the
Double
D
symbol
are
trademarks
of
Dolby
Laboratories.
(Manufactured
under
license
from
Dolby
Laboratories).

DISMANTLING
OF
UNIT
In
case
of
trouble,
etc.
necessitating
dismantling,
please
dismantle
in
the
order
shown
in
the
photographs.
Reassemble
in
reverse
order.
SCREWS
SCREWS
FRONT PANEL
SCREWS
UPEER COVER
BACK BOARD
SCREWS
CONTROL KNOBS
LID PANEL
Pult
toward
you
both
lower-ends
of
folder.

i. CONTROLS
No
10.
11.
12.
POWER SWITCH
CASSETTE RECEPTACLE
TIMER START SWITCH
INDEX COUNTER AND RESET BUTTON
AUTO SYSTEM SWITCH |
MEMORY/IPSS SWITCH
PROGRAM DISPLAY .
IPSS PROGRAM SWITCH
CLEAR SWITCH
FL DISPLAY BAR METER
RECORDING INDICATOR LAMP
LEFT —*}-RIGHT RECORDING
LEVEL CONTROLS
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
Fig. 1 Controls
MICROPHONE JACKS
OUTPUT/PHONES LEVEL CONTROL
DOLBY NR SWITCH AND FILTER
TAPE SELECTOR
HEADPHONE JACK
REC MUTE
OPERATING KEYS
LINE OUTPUT JACKS
DIN JACK (The JPN, USA models do not have this facility)
LINE INPUT JACKS
INPUT SELECTOR SWITCH
(The JPN, USA models do not have this facility)

iv. PRINCIPAL PARTS LOCATION
_REC/PB HEAD
H9O! PR4-7
POWER SWITCH WIND. SWITCH
SWE SW903: =:
os PROGRAM_LED
; “SWITCH SWI. RC BOARD CE-5206B
UsTIMER “START: =~: [oss5:s MEMORY/IPSS: | ss PROGRAM. SWITCH
SWITCH > fo Se SWITCH SW2 vote SW4
CLEAR SWITCH
sw3
LED P.C_ BOARD
CE-5201B
MUTE SWITCH
Sw902
BAR METER
INDI
ERASE HEAD
H902 E-921
PHONES JACK J3
DOLBY NR AND FILTER REC LEVEL.
SWITCH SW3 CONTROLS VR!
REC MUTE SWITCH TAPE SELECTOR
sw5 Sw4
OUTPUT LEVEL
CONTROL VR!
L R
Ld
MIC JACKS
Fig.2 Front View
VOLTAGE SELECTOR
vsi
POWER SUPPLY
P.C BOARD CE-5202
POWER TRANSFOMER
CET- 2!
PRE AMP _P.C BOARD
CE-S5201A
POWER SWITCH MOTOR
sw!
M901 MMI-6A2LK
SYS.CON RC BOARD
CE-5206A
Fig.3 Top View

V.
VOLTAGE
AND
CYCLE
CONVERSION
POWER SUPPLY
RC BOARD CE-5202
POWER CORD
SHORT PIN
Fig. 4 Voltage Conversion (U/T Model)
1.
VOLTAGE
CONVERSION
2.
Loosen
holding
screws
and
remove
upper
cover
Models
for
Canada,
Europe,
USA,
UK,
Australia
and and
back
board.
;
Japan
are
not
equipped
with
this
facility.
3.
Remove
short
pin
plug
from
present
holes
and
Each
machine
is
preset
at
the
factory
according
to
replace
in
correct
holes.
Follow
the
markings
destination,
but
some
machines
can
be
set
to
110V,
explicitly.
120V, 220V or 240V as required.
If voltage change is necessary, this can be accom-
plished
as
follows:
2.
CYCLE
CONVERSION
1.
Disconnect
power
cord.
With
DC
motor,
cycle
conversion
is
not
necessary.

Vil.
IPSS
CIRCUITRY
OPERATION
EXPLANATION
¥ © CLEAR PROGRAM © \
LINE OUT
De
(LEFT)
BLANKING
DISPLAY
COMPARATOR
REFERENCE
VOLTAGE
LINE OUT
2 (RIGHT)
he
LINE AMP
-
TAPE COUNTER
& (000)
ONE SHOT PULSE :
GENERATOR
STOP
|
peu
ON
OorF
|
IPSS
OMEMORY
ae
OOFF
AUTO SYSTEM
1.
IPSS
(Instant
Program
Searching
System)
is
the
pro-
graming
in
advance
of
the
song
or
songs
(up
to
9
from
the
present
position
on
the
tape)
you
want
to
listen
to.
When
the
FF
or
RWD
and
PLAY
keys
are
depressed
simultaneously,
the
no
signal
portion
between
songs
is
detected
by
the
REC/PB
head
and
the
number
of
these
is
counted
down
according
to
the
programmed
number
of
songs.
As
it
goes
from
1
to
0,
the
FF
or
RWD
key
is
released
and
it
enters
the
Play
mode.
2.
CIRCUITRY
DETECTING
THE
NO
SIGNAL
PORTION
(Refer
to
Figs.
6,
7,
&
8)
When
the
FF
or
RWD
and
PLAY
keys
are
depressed
simultaneously,
the
REC/PB
contacts
the
tape
and
the
signal
on
the
tape
is
picked
up
by
REC/PB
head.
The
head
is
about
1.7
mm
lower
than
it
would
be
in
the
playback
mode.
The
picked
up
signal
is
added
to
input
IC1-1
@
in
the
Limiter
Amp.,
it
is
amplified,
detected
by
D2
and
added
as
TR1’s
base
bias.
TR1
is
ON
and
IC1-2
©
is
practically
earth
potential.
The
standard
voltage
of
the
Comparator
(IC1-2)
is
1/2
Vcc
(about
6V)
so
the
output
@
becomes
Vcc
(about
12V).
When
a
no
signal
portion
is
reached,
base
bias
is
not’
added
to
TRI
and
it is
turned
OFF.
C3
charges
and
IC1-2
@
becomes
Low
Level
at
the
point
that
|, [i
F.F./RWD KEYS REC KEY REC MUTE BUTTON
Fig.5
IPSS/MEMORY
SYSTEMS
BLOCK
DIAGRAM.
NOTE
1. SWITCHS ENCLOSED BY [___] ARE MANUAL.
2. & 1S A SWITCH CIRCUIT.
LEFT AND RIGHT ARE CONNECTED ONLY
WHEN A COMMAND IS INPUT 4.
IC1-2 ©’s potential exceeds the standard voltage
(1/2 Vcc) in the comparator. As a result, charging
current flows into C5 and a trigger pulse is generated
at the cathode side of D14. IC2 counts down by this
pulse’s falling portion.
C2 and RS are to compensate for the high frequency
level drop caused by the head not touching the tape
perfectly.
When there is noise in the portion between songs
on the tape, there is more than one trigger pulse
generated in the portion making miscounting a
probability. C5’s charged and discharged electricity
are used to prevent this occuring.
C5 is charged through D3 and R56 while IC1-2 @ is
at
Low
Level
(no
signal
portion
between
the
songs
on
the tape) and both terminal’s voltage difference is
almost Vcc (+12V). When the no signal portion is
over IC1-2 @ becomes High Level and because it is
piled on to the potential charged to C5, D14’s
cathode side’s potential becomes higher than +B’s
(+12V) potential. Then C5 will discharge through
R14 until both terminal’s potentials are equal. Until
C5 discharged down to a certain level even if
IC1-2 @ becomes Low Level, only a small trigger
pulse is created in the D14 cathode side and does not
reach
the
IC2’s
DOWN
COUNT
operation
level.
Therefore the programme counter does not count.
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“7, MONOSTABLE ASTABLE MULTIVIBRATOR
MULTIVIBRATOR
Fig.6 IPSS/MEMORY SYSTEMS SCHEMATIC DIAGRAM
10

MUSIC-I_ MUSIC -2
(a) I¢ 1-1 @)
tb) IC 1-1
o—_— st
(atc 1-2 6)
1/2Vec
enc i-2 @
{f) DI4 CATHODE
DOWN COUNT
Fig. 7
> BLANK
NOSE |
MusIC | 4 he 1 MUSIC
“@ici-2 @ } |
; . | | |
ie C5~RI4 DISCHARGE
ae
CHARACTERISTICALY
DOWN COUNT OPERATION LEVEL
OF Ic2
{b) DI4. CATHODE
Fig. 8 When there is noise in the portion between songs on the tape
11

3. CIRCUIT CONSTRUCTION OF
IC2 MSM 5953RS
Function BCD UP/DOWN COUNTER/7
SEGMENT DECODER/DRIVER
Construction CMOS IC
1) Block Diagram
uP IN C1)
1
SCHMIDT
CONTROL
j
1
I
I
|
{
I
|
I
'
!
i
u/D ()
DOWN OUT
DOWN IN
r
2) Terminals and their functions
1.
2
3.
UP IN: Counts up (+1) using the raised portion
_FL of the pulse.
DOWN IN: Counts down (—1) using the falling
portion +J of the pulse. Does not count at 0.
DOWN OUT: Outputs when there is DOWN IN
input. ,
When a condenser is attached between this
and GND, after input enters the DOWN IN
terminal, the delayed time can be adjusted up —
until the counter counts down.
. U/D (UP/DOWN): There is input to the DOWN
IN terminal but counts down only when this
‘terminal is Low Level.
f
(3) COUNTER
I
\
I
(2) SCHMIDT
|
I
|
BCD 7
SEGMENT
DECODER
1a)
~
(6) BORROW OUT
SEGMENT
DRIVER OUT
ant eaerFr Aa
-----©®OG0O@---
Fig.9 MSM5953RS
. RBI (Ripple Blanking Input): When put to
Low Level the counter display (LED) is extin-
guished.
BORROW OUT: There is momentary output
when there is DOWN input after the counter
goes from 1 to Qor from 0.
. RESET: When put to Low Level the counter is
reset to 0.
to 15 SEGMENT OUT: Connects the Anode
Common 7 Segment LED.
Light up when put to Low Level.

3) Function Table
COUNT CONDITION
BORROW OUT
X = Doesn’t matter
Chart-2
RESET uD | DOWNIN | UPIN | COUNT CONDITION | COUNT
H #H xX a xX a NO .
|
a
X
x
UPCOUNT(#1)
|
art ee =F
an eee ae? ae. X |_NO |
H L L a X UPCOUNTGH) |
H | OL =e H 1 to9 | DOWN COUNT (-1)
a a ee ae H 0 No.
[ 4 ae ee X X CLEAR (0)
X = Doesn’t matter
Chart-1
13

+8
REwso! ~1C 2D UP IN
OFF
REC MUTE SW
Fig. 10 Oscillation Stopped .
+8 +B
*swao! IC 2) uP IN
=
ON
REC MUTE SW
cis ip:
R48
! 2 ~=> UP COUNT
(b) O
(a)
a
ei
Fig. 11 Oscillation
14

4. OSCILLATOR CIRCUITRY FOR REC
TIME COUNT (Refer to Figs. 10 and 11)
This circuit is to indicate the Rec Mute Time Count
in Program LEDs -and to add one second interval
pulses to the UP IN terminal of IC2.
When the Rec Mute button is not depressed, IC3a’s
input terminal @3 is “L” and IC3b’s output terminal
@ is “L”. C13 has been discharged as in Fig. 10 and
1C3a’s input terminal @ is changed to “H” by this
potential.
At this point, when the REC MUTE switch is
depressed, IC3a’s @3 changes to “H” IC3a’s output
terminal @D to “L” and IC3b’s @ to “H’”. As IC3’s
@ has become “L”, C13 discharged through R44.
During this discharging period (time constants of C13
and R44) IC3’s @ becomes “H” due to the voltage
drop at both terminals of R44.
Once C13 has finished discharging, there is no current
flowing in R44 and the voltage drop is 0 so IC3a’s
@ changes to “L”. As a result IC3a’s @) becomes
“H”, IC3b’s GO “L” and this time the charging
current flows from IC3a’s @) throught R44 to C13.
During this charging period (Fixed time constants
of R44 and C36) IC3a’s @) becomes “L”.
After C36 has been charged, due to this potential,
IC3a’s @, changes to “H”, @ to “L” and IC3b’s
@ to ‘“H’’. The above operation is repeated and a
1 Hz square wave appears at IC3b’s output terminal
®
. MONOSTABLE MULTIVIBRATOR
OPERATION (Refer to Fig. 6)
A plunger is activated by IC2’s output © to release
the FF or RWD key in the IPSS mode. However in
IC2’s output there is a pulse width which is too
narrow to drive the transistor directly so the pulse
width is enlarged by a Monostable vibrator, the
transistor drive is corrected and then the plunger is
activated.
. ONE SHOT PULSE GENERATOR
(Refer to Fig. 6)
This circuit resets the counter for an instant when the
REC key has been depressed while the REC Mute
switch is being depressed.
When the REC key has been depressed after the REC
Mute key, if TR14 has not been attached, TR4 turns
off and the IC2 counter does not reset. If the counter.
is counting down numbers with the program switch
these numbers will. be increased by the time taken to
depress the REC Mute switch. To prevent this, when
the REC switch is put on TR14 is put on simultane-
ously for a certain period (the difference between
C70’s and C71’s charging periods) of time only.
When TR14 is turned on TR4 turns on and the
counter is reset. Therefore the REC MUTE TIME
indication begins from 0.
15

CAM LEVER(A)
PLAY,RWD KEY
.
DESCRIPTION
OF
KEYBOARD
OPERATION
(Refer
to
Fig.
12)
With
IPSS
and
MEMORY
operation
the
PLUNGER
is
activated
and
pulls
the
KEYBOARD
CAM
back.
Only
the
FF
or
the
RWD
keys
are
released
and
the
deck
is
put
in
the
playback
mode
by
the
combination
of
the
KEYBOARD
CAM,
the
PLAY
CAM
and
the
CAM
LEVERS
(A)
and
(B).
The
PLAY
CAM
and
the
KEYBOARD
CAM
are
fixed
by
slotting
CAM
LEVERS
(A)
and
(B)
into
section
A
of
the
KEYBOARD
CAM.
(Refer
to
Fig.
12a.)
Now
in
the
IPSS
mode,
when
the
RWD
and
PLAY
keys
are
depressed
simultaneously,
the
RWD
key
attaches
to
the_J
L
section
of
the
KEYBOARD
CAM
and
the
PLAY
key
to
the
[
L
section
of
the
PLAY
CAM.
.
CAM
LEVER
(B)
which
is
being
held
up
with
CAM
LEVER
(A)
by
the
RWD
key
also
moves
in
the
_
direction
of
the
arrow.
(Fig.
12a,
b)
CAM LEVER(B)
CAM LEVER(A)
Fig. 12
CAM LEVERS (A) and (B) separate from the section
A which is fixing the KEYBOARD CAM and the
PLAY
CAM
so
even
if
the
KEYBOARD
CAM
is
pulled
backwards,
PLAY
CAM
remains
attached
to
the PLAY key and does not move backwards.
Therefore
even
when
the
PLUNGER
pulls
the
KEYBOARD
CAM
backwards
because
of
the
IPSS
and
MEMORY
operation,
the
PLAY
CAM
does
not
move
back
with
the
result
that
only
the
RWD
key
is
released and the deck goes in to the play mode.
(Fig. 12c)
This
will
be
the
same
when
the
FF
key
is
depressed
simultaneously
with
the
PLAY
key.
After
the
FF
or
RWD
and
PLAY
keys
have
been
depressed
simultaneously,
when
the
STOP
key
is
depressed
once
only
the
FF
or
RWD
key
will
be
released
so
to
release
the
PLAY
key
the
STOP
key
must
be
depressed
one
more
time.
This
is
due
to
the
operation
outlined
above.
a

VIL.
THMER
START
SWITCH
OPERATION
WORM PULLY
Fig. 13
The
TIMER
START
SWITCH
is
designed
to
put
the
deck
in
the
REC
or
PLAY
modes
by
releasing
the
PAUSE
key
automatically
(the
PAUSE,
REC
and
PLAY
keys
have
already
been
depressed)
when
the
power
is
turned
on
by
the
timer.
In
the
PAUSE
mode,
the
PAUSE
SLIDE
is
lifted
up
and
fixed
by
attaching
the
LOCK
PIN
to
the
LOCK
CAM
so
to
release
the
PAUSE
mode
all
you
have
to
do
is
to
detach
the
LOCK
PIN
from
the
LOCK
CAM.
When
put
into
the
PAUSE
mode,
the
LOCK
PIN
is
attached
to
the
LOCK
CAM
and
the
PAUSE
SLIDE
is
locked.
When
the
TIMER
START
SWITCH
is
put
on
—
TIMER
SLIDE
(A)
moves
upwards
and
as
a
result,
TIMER
SLIDE
(B)
moves
upwards
to
the
inside
in
the
direction
of
the
arrow
and
downwards
to
the
outside.
See
Fig.
13b.
If
the
power
switch
is
turned
on
here,
the
WORM
-
PULLEY
and
the
WORM
GEAR
revolve.
The
pin
on
the
WORM
GEAR
CAP
moves
in
the
direction
of
the
arrow
TIMER
SLIDE
(B)
is
pushed
down
so
the
LOCK
CAM
is
pushed
upwards
by
this
section.
Then
the
LOCK
PIN
is
detached,
the
PAUSE
SLIDE
lowers
and
the
PAUSE
key
is
released.
The
TIMER
START
SWITCH
is
also
released
because
TIMER
SLIDE
(A)
is
pushed
down
by
TIMER
SLIDE
(B).
17

VII.
AUTO
STOP
MECHANISM
OPERATION
~—
RELEASE LEVER
AS ARM SPRING
f oan AS LEVER
Lig aia PULLY
Fig. 14
WORM GEAR
(a)
(b)
(c)
AS ARM SPRING
Fig. 16

a
AUTO
STOP
puts
the
deck
into
the
STOP
mode
by
releasing
the
keys
when
the
end
of
the
tape
is
reached
in
the
PLAY,
FF,
RWD
REC/PB
modes.
1.
HOW
EACH
PART
OPERATES
—__
a.
CLUTCH
PLATE
(B)
(Fig.
14)
©
There
is
felt
attached
to
this
and
friction
force
is
generated
(Shown
by
the
arrow)
and
it
seems
as
if
it
is
pushing
the
AS
ARM
outwards.
b. AS LEVER (Figs. 14, 16)
The
pin
attached
to
the
rear
of
the
AS
LEVER
enters
the
groove
of
the
WORM
GEAR.
It
touches
against
thet
section
a
as
the
WORM
GEAR
revolves
and
moves
to
the
left
or
right
or
is
pushed
down by ct section B.
c. RELEASE LEVER (Fig. 14)
Adds
the
same
friction
force
to
the
AS
ARM
by
pulling
down
the
AS
ARM
Spring
in
the
pause
mode as when the reel revolves.
-
2.
When
put
into
the
PLAY
(FF,
RWD)
mode
the
fly-
wheel
revolves
and
the
WORM
pulley
and
WORM
gear
revolves.
The
reel
revolves
and
the
CLUTCH
PLATE
goes
to
push
the
AS
ARM
outwards
with
the
friction
force
so
the
pin
at
the
rear
of
the
AS
LEVER
‘receives
this
force
to
the
left
then
it
contacts
the
ridged
sectionc!
4A
of
the
WORM
GEAR
and
move
to
the
left
and
right.
At
the
end
of
the
tape,
the
reel
stops
revolving
so
the
friction
disappears.
In
the
PLAY
(FF,
RWD)
mode
the
RELEASE
LEVER
drops
so
friction
is
not
added
to
the
AS
ARM
from
the
AS
ARM
SPRING.
The
Worm
Lever
continues
to
revolve
and
the
AS
LEVER
pin
is
taken
up
to
the
top
of
the
ridged
C4
section
where
it
then
stops.
It
is
then
pushed
down
by
the
WORM
GEAR
section
Bl,
and
pushes
down
the
AS
SLIDE
with
the
AS
LEVER
and
releases
the
PLAY
(FF,
RWD)
keys.
When
the
PAUSE
key
is
depressed
from
the
PLAY
mode
the
reel
stops
revolving
and
the
force
from
the
CLUTCH
PLATE
tothe
AS
ARM
stops.
However
the
PAUSE
SLIDE
moves
upwards
and
pushes
up
the
RELEASE
LEVER
which
had
been
held
down
so
the
same
force
is
applied
as
to
the
AS
ARM
by
the
AS
ARM
SPRING
so
AUTO
STOP
does
not
operate.