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() r:loNeerl"
ORDERNO.
ARP-218-O
STEREO
CASSETTE
TAPE DECK
GT-X5
MODEL CT-XSCOMESIN THREE VERSIONSDISTINGUTSHED FOLLOWS:
AS
Type Voltag, Remark
HE 22OV and 24Ov (Switchable) Europe model
HB 22Ov and 24OV {Switchable} United Kingdom model
D and 24OV(Swatchable)
12OV,22OV G e n e r a le x p o r t m o d e l
r This servicemanual is applicableto the HE and HB types. For servicing the D type, please
of refer to
the additional
service manual{ARP.236-0}.
o Ce manueld'instruction serefdreau mode de r6glage, frangais.
en
o Estemanualde serviciotrata del mdtodo de aiusteescritoen espafrol.
CONTENTS
r . s P E c r F r c A T t.o N.S. . . . .
.. . 2 9 . P . C .B O A R D S O N N E C T I O N I A G R A M
C D
2. F R O N TP A N E L F A C I L I T I E S . .
. 10. SCHEMATIC IAGRAM D
3. D|SASSE|\,BLY. . . . . . . . . . 11 . E L E C T R I C A L A R T SL I S T
P 30
4. P A R T S O C A T I O N. . . . . .
L 5 1 2 . A D J U S T M E N T. . . .
. 33
5. B L O C KD I A G R A M REGLAGE 40
6. CIRCUIT ESCRIPTIONS.
D . I AJUSTE.
7. EXPLODED IEWS . . . . . .
V 17
8. PACKING
PIGINEEFI ELECTFICINIC CCIFIPG,FIATION a r, Mesu.o 1 chome. Mesu.o-ku. rokyo1s3, Japa.
PIC,NEEFI ELECTFIONICA IUBAI lNC. 1925 E. Oominguez Sr., Lons Beach. Catironnia gOE.1O Ll.S.A.
PIC'NEEFI ELECYFICINIC [EUFICIPEI N.v. Keetbe.glaan T, 2740 Beve.en. Bets,um
PfONEEFf ELECTFIG|NIC3 AUAYFALIA PTY. LTEI. 17a 1a4 Bounda.y Fload, E.6es de. V cto.,a 31s5, Ausr.aha
YH O \OV. 1 9 8 2 P r i n t e dl d D d n
1. SPECIFICATIONS
Systems Compactcassette,2-channel stereo 4. Wow I Flutter: o JIS [3 kHz, with acoustic compensa-
Heads........"Hard Permalloy" recording/playback x 1 head tion (weighted) rms valuel; DIN t3,150 Hz. with
"Ferrite" erasingheadx 1 acoustic compensation (weighted) PEAK value DIN
Motor........... D Cs e r v o o t o rx 1
m 45507
W o w a n dF l u t t e r . . . . . . . . . . . . . . . o m o r h a n0 . 0 5 %( W R M S )
. N t E Frequency Response: o Measured at - 20 dB level,
N o m o r et h a n+ 0 . 1 7 %( D l N ) DOLBY NR OFF, level deviation is +6 dB without in-
FastwindingTime ... Approximately 10seconds(C-60 1 tape) dication.
Frequency Response S i g n a l t o N o i s e R a t i o : o M e a s u r e da t t h e t h i r d h a r m o n i c
-20 dB recording:
distortion 3o/olevel, weighted (DlN 455.|3/BLATTT).
Normal tape ........4Oto 15,000 + 3 dB
Hz 7 . Sensitivity: Input level (mV) required for reference
(30to 16,000 Hz) recording level with input (REC) level controls set to
Chrometape .......40to15,000H2+3dB maximum.
(30to 16,000 Hz) 8 . M a x i m u m A l l o w a b l e I n p u t : W h i l e d e c r e a s i n gs e t t i n g s
Metaltape 40 to 15.000 + 3 dB
Hz o f i n p u t ( R E C ) l e v e l c o n t r o l s a n d i n c r e a s i n gl e v e l a t
(30to 16,500 Hz) input lacks, this is the maximum input level (mVl at
Signal-to-Noise Ratio the point where recording amplif ier output waveform
D o l b y RO F F . . . . . . . . . . . . .
N M o r e h a n5 7 d B
t b e c o m e sc l i p p e d .
NoiseReductionEffect R e f e r e n c eO u t p u t L e v e l : - 7 d B v l e v e l a t l i n e o u t d u r i n g
D o l b y RO N . . . . . . . . . . . . . . . . . . . .o r e h a n1 0d B ( a t5 k H z )
N M . t playback.
Harmonic Distortion No morethan 1.0olo dB) (0 1 0 T h i s m o d e l d o e s n o t e m p l o y a r e c o r d i n g / p l a y b a c kc o n -
Input nector (DlN-type).
(Sensitivity/Maximum allowableinput/lmpedance)
LINE(INPUT) 63 mV/25V/50 ka
Output (Reference level/Loadimpedance)
L I N EO U T P U T ) . . . . . . . . . . . . . . . .
( .. 4 5 0m V / 5 0 a
k
o PowERSWTTCH
Subfunctions When this switch is depressed, power is turned on and
the
the OPERATION MODE indicator(POWER-l lights.
r Dolby NR system(ON/OFF)B type
Depress switch againto release when turning off the
the it
. 3 positiontape selector(NORM/CrOr/METALI power to the deck.
o Air damp eject function r The muting circuit is actuatedafter the POWERsivitch
o Full automaticstoDfunction
o has been set to ON and there will be no operationfor
RECmutingfunction
o about 4 seconds.This is not failureor malfunction.
Music searchfunction . When the POWERswitch is set to the OFF position
r Timer stand-byfunction
. while the tape deck is operating, deck'soperation
the is
One-touchrecording function
o released and the stop mode is established.
Operating mode indicator (POWER,REC,PAUSE)
o A.L.C (AutomaticLevelControl)recordingfunction
o lC-based logic control
full ) EJECTBUTTON
Depress this button to open the cassetteholder.To close
Miscellaneous the cassetteholder,push the top back until it locks.
Do not pressthis button when the taoe is in motion.
PowerRequirements .............AC 220V / 24 V(switchable)
50/60 Hz
P o w e r o n s u m o t i o n. .. . . . . . .
C .. . . . . . . . .3 0w a t t s O) TAPECOUNTER
Dimensions . 3 2 0 ( W )x 9 9 . 5 ( H l x 2 0 0 ( D m m ) This countershows the positionof the tape usinga three-
1 2 - 5 l 8 W ) x 3 - 1 5 / 1 6 H )x 7 - 7 l 8( D l i n
( ( digit meter.
Weight (withoutpackage) . 3.6 kg (7 lb 15oz)
O) COUNTER
RESET
BUTTON
Supplied Parts Depress button to resetthe tapecounterdisplay 000.
this to
O p e r a t i nn s t r u c t i o n s
ig . . . . . . . . . . . . . . . . . . . . . . 1. . . .
.
C o n n e c t i o n r dw i t h p i np l u g
co . . .. . . . . . . . . . .. . 2 o oPERATTNG
MODETNDTCATORS
REC: This lightswhen the RECswitch (o) is pressed.
NOTES: POWER: This lightswhen the POWERswitch is pressed.
Specifications and the design subject to possible PAUSE: This lightswhen the PAUSEswitch ( I I ) is
modifications without notice due to improvements. Dressed,
NOTES:
1. Reference
Tapes: G) TAPESELECTOR
SWTTCHES
Normal6 LH: DIN 44513/BLATT6 equiv.
or This selector
allowsthe biasand equalizer characteristicsto
CrOrDIN 455'13/BLATTT (CrO2) equiv.
or be selectedduring recordingand equalizer characteristics
2. ReferenceRecordingLevel: -7 dBv level at line out during playbackin line with the type of tape you are using.
(160nwb/m magnetic level : Philips reference
cassette NORMAL: For normaltapes
levell CrOr: For chrometapes
3. ReferenceSignal:333 Hz METAL: For metal tapes
2.FRONT PANEL FACILITIES
(0 ProNc@
o TTMERSTARTSWTTCH o RECMUTESWTTCH
This switch is used when an optional audio timer is Depressing this switch during recordingmakesit possible
employed for unattened recording or wake-up_ playback to createan unrecorded blankon the cassette tape only for
operations. Keepthis switch at the OFF positionwhen the the time during which the switch is kept depressed. This
timer is not being used. switch is used for providingblanksof the requiredlength
REC: Set to this position to set the tape deck betweenprograms and editingtapesso that they areeasier
automaticallyto the recording mode at the to listento and for creatingthe unrecorded blankswhich
time preseton the audio timer and to start the are required operating MUSICSEARCH
for the facility.
recording of programs unattended, for in_ . No signalis recorded when the switch is touchedduring
stance. recording.Do not touch the switch unlessnecessarv.
OFF: For when the timer is not being used.
PLAY: Set to this position to set the taoe deck (D *DOLBY NR SWTTCH
automatically the playbackmodeat the time
to Depressthis switch to ON for recordingwith the built-in
preset on the audio timer and to start the Dolby Noise Reductionsystemand for playbackof tapes
playback.The tape playbackfunction can oe which have been recordedusing the Dolby Noise Reduc-
used to wake-up in the morning insteadof an tion system.
alarmclock. For other tapes, do not pressthis switch.
o ) M U S |CS E A R C H WT T C H
S *The word "Dolby" and
00 are trademarksof Dolby
Use this switch when playing a tape with music recorded Laboratories
LicensingCorporation.
on it to quickly locate the beginning of songs separated by NoiseReductionSystemmanufactured underlicensefrom
a non-recorded section of over 4 seconds duration. ln the Dolby Laboratories
LicensingCorporation.
fast-forward mode or rewind mode. when this switch is set
to ON, tape travel will stop in the non-recorded area bet- @ oPERATING
SWTTCHES
ween songs and the unit is automatically set to the REW (<>l: Depressthis switch to send the taoe for-
o RECSWTTCH ward at high speed (The tape will travel
Depress this switch to start tape recording. This switch will from left to rightl.
not work when a cassette is not loaded or when the erasure STOP (tl: Depress this switch to stop the tape travel
prevention tabs of a loaded cassette have been broken off. and to release operatingswitches.
the
When this switch is depressed to the ON position, the PLAY (>l: Depress this switch to start tape playback.
OPERATION MODE indicator (REC o) will be iiluminated.
@ PAUSESWTTCH
Depress this switch to stop the tape traveltemporarily
dur-
ing recordingor playback. Depressthis switch again to
allow the tape to continue to travel. When this switch is
depressed the ON position,the OPERATION
to MODEin-
dicator(PAUSE I I ) will be illuminatd.
. The tape does not stop during fast forward or rewind
oorations even when the PAUSEswitch is deoressed.
3. DISASSEMBLY
. Tape transport unit
R e m o v e t h e f o u r s c r e w s( E ) .
. Front panel assembly
R e m o v e t h e s i x s c r e w s( D ) .
. Bottom plate
Remove the
t w o s c r e w s( B ) .
. Door assembly
1. Depress the EJECT button and
o p e n t h e c a s s e t t eh o l d e l .
2. Removethe hooks (C).
3. Pull up the door assemblv
4. PARTS LOCATION
NO?ES:
c Parts utithout part number cannot be supplied.
o The I marh found on some component parts indicates the importance of the
safety factor of the part. Therefore, when replacing, be sure to use parts of identical
designation.
o For your Parts Stoch Control, the fast mouing items are indicated with the marhs
** and *.
** GENERALLY MOT'"ESFASTER THAN *.
This classification shall be adjusted by each distributor because it depends on model
number, temperature, humidity, etc.
Front PanelView
F r o n t P a n e la s s e m b l y Knob B (TAPESELECTOR)
RX8-692 RAC-286
Eject knob KnobA (PAUSE, ECMUTE)
R
RAC-281 RAC-276
Bonnet ,- Knob B (REC)
RNA-592 | RAC-277
I
** Door assembly
I
I
'@l
l
K n o b ( P L A Y , F F , R E W ,S T O P )
RX8.693 F.AC-282
Knob (POWER) KnobA (DOLBYNRI
RAC.280 RAC-285
Standby knob B-^ Standby knob
(TIMER) ( M U S I CS E A R C H )
RAC-294 RAC-234
Front View with Panel Removed
T a p e c o un t e r * LED ILED4O2, POWER)
RAW-189 8G5524S
LED (LED4O1, EC}
R * LED(LED4O3.AUSE)
P
PR5524S BG55245
Cassette late
p ** P u s hs w i t c h ( S 4 O 1 - 5 4 0 7 1
RAH.433 RSG-143
* E r a s eh e a d Control assembly
RP8-096 RWG-137
(R P 8 - 0 8 5 )
** R E C / P Bh e a d ** P u s hs w i t c h ( 5 3 0 5 )
RPB.O89 RSG-144
** P i n c ha r m a s s e m b l y ** P u s hs w i t c h a s s e m b l y
RX B-720 (s302-s304)
RSG-145
t* S l i d es w i t c h { S 4 O 9 . I M E R )
T ** Slide switch (5408)
RSH-064 RSH-066
5
Top View
/\** Transistor 701)
(o
25D1 65
2
r\ ** (o801)
Transistor
25D1 65
2
V a r i a b l er e s i s t o r( I N P U T }
RCV-106
1\** Fuse(FU1, T8O0mA)
REK-O64
A * Po*ur transformer
12201240V],
-
Main assembly
RTT-293
RWX.631
*'t Motor assembly
RXM.O76
Side assembly
RWX-643
A t t P l r n g " ts o l e n o i d
R
RXP-127
( RX P - 1 3)1
f'1 * P l u n g e rs o l e n o i d F
RXP.126
(RXP-130)
t ** Pushswitch (5305)
RSG-144
i\ ** eusnswitch(S301) t* Pushswitch assembly
RSA-060 (s302-s304)
RSG.145 -
-
Rear Panel View
[ ** Line voltage selector
RSX-045 Strain relief
REC-396
"d#lY1-:-""-_*
* V a r i a b l er e s i s t o r( l N P U T }
RCV-106
-
f AC power cord
RDG-O36 (for HE type)
RDG-049 (for HB type)
T e r m i n a l4 - P ( l N P U T / O U T P U T )
R KB.O2O
-
6
E15. BLOCK DIAGRAM 2 3
REC/PB SWICHES FLAT AMPLIFIER
[ .- -,.*l i...
I i:+r
I
i'--q I
+--rt_jr +.
I h l::r'
?Y
.-|.
tm
LINE OUTPUT MUTE GATE DOLBY NOIS
*-LadB-
B
I o5os
P.-.
HREc>
AMP.
RECOROING
R E C O R D I N GI A S O S C I L L A T O R
g
TAPE SELECTOR SWITCHES :
NORM 42l.7mV
CrOz : 489.8mv
M E T A L6 9 t . 8 m V
T
D
-l' 1 2 3
I
4 5 6
CONTROL IRCUIT
C
PLAY
AL IN -o o--1
FF I
{H
-
MUTE REw I
-o5
sToP I
-on
I
TION CIRCUIT m
tc 301
I
PAUSE I
BIAS OSC, PAJSE .H
I
m
PATJSE
FF SOL.
MS
REW SOL.
PrN soL.
cH IlXrtSr,
MS SOL.
-
LINE MUTE aT
ENO PULSE R E CM U T E
AMP.
RECORDING
P O W E RS U P P L YC I R C U I T
POWERIND,
-
4 5 6
6. CIRCUIT DESCRIPTIONS
6 . 1 O U T L I N EO F M A I N S T A G E
PlaybackEqualizerCircuit ferent recording bias levels for the different types
The EQ amplifieremploys2-stage
direct-coupled of tape (NORM , CrO2 and METAL) are switched
amplifier, ild the NFB circuit is designed for by changing the oscillator power supply voltage
playback equalization with normal (NORM) tapes. which in turn varies the oscillating power.
For playback equalization with chrome (CrO2)
and metal (METAL) tapes, the transistor switch
6.2 CONTROLCIRCUIT
is turned on to incorporate the RC network in the
output circuit of the EQ amplifier. The control circuit in this deck utilizes a one-
chip IC (PM9002B) which enables feather-touch
Dolby Noise Reduction System
operations. In addition to mechanism control,
The CT-X5 features the B-type Dolby noise this IC also includes music search (MS), auto-stop,
reduction system (where the S/N ratio is improved and timer start functions. And due to the digital
by up to 10dB above SkHz) incorporated in a counter frequency divider system employed in
Dolby IC (HA1L226). timing settings for the mechanism control, all
RecordingAmplifier operational timing discrepancies have been elimi-
The recording amplifier uses a single transistor nated. The PM9002B pin layout is shown in
and has a high frequency peaking circuit in the Fig. 6-1, the functional block diagram in Fig. 6-2,
emitter, and a trap in the output circuit to prevent and the output pin time charts during different
leakage of the recording bias signal. The peaking modes in Figs. 6-3 and 6-4. For interrelations
response of the high frequency equalization cir- between circuits, see the block diagram on page 7.
cuit can be changed to give three different re- Operationsduring Each Mode
sponses by the TAPE SELECT switches for dif-
The mechanical operations effected by the
ferent types of tape (NORM, CrO, and METAL).
following circuit changes are described in the next
Further, during playback, both the input and
chapter (seepage 14).
output circuits of this amplifier a^re grounded.
BiasOscillator
This push-pull oscillator circuit supplies the
erasehead with the erasecurrent, and the recording
head with the recording bias current. The dif-
vcc ''"t'
".. J
OFF O
pltrse
erav
l,
f
a-E- ENO
PULSE
REC
PLAY
srop
n-ew
M5
TIMING
NOISE
SENSE
L
FILTER
T I MI N G
x
N OI S E
FIL TimanO
itw- clck OSC
SIGNAL si6F &
IN divrdcr
FrIV
GND
TEC
FAUSE
AR
Fig.6-1 PM9002B inlayout
p Fig.6-2 P M 9 0 0 2 B i n t e r n a lb l o c k d i a g r a m
Normal ooeration
PLAY STOP FF STOP REW STOP REC,/PAUSE PAUSE STOP REC STOP PAUSE PAUSE PLAY PAUSE
LINE I'UTE
( Pin 27)
REC MUT
( Pin 28)
PINCH SOL
( Pin 24)
FF SOL.
( Pin 2O)
RW SOL.
( Pin 25)
MS SOL.
( Pin 23 1
F i g . 6 - 3 P M 9 0 0 2 B i m e c h a r t ( W h e n S s w i t c hi s O F F )
t M
Normal operation MSSW:ON Dir&t change
STOP RW FF STOP PLAY STOP REC STOP REC FF REC PAUSE
LINE MUT
( Pin 271
REC MUTE
( Pin 28)
ErAS OSC
( Pin 22)
PINCH SOL.
{ Pin 29)
FF SOL.
( Pin 26)
REW SOL.
( Pin 25 I
MS SOL.
{ Pin 23}
PAUSE
Pin 2l )
F i g .6 - 4 P M 9 0 0 2 B i m e c h a r t ( W h e n S s w i t c hi s O N )
t M
'10
1. When the POWER Switch is Switched ON 2. Play lVlode
Then the POWER switch is switched on, * bV is When the PLAY button is pressed,the level of
applied to pin 1 (Vcc) of IC401. During the initial pin 5 (PIEY) of IC401 is switched to ,,L,, level,
period when pin 1 voltage is being increased from and the level of pin 24 (PINCH SOL) to ..H"
0V to 5V (approximately from 0.6V to 2.4V) the level. Q503 is turned on and the pinch roller
IC's internal reset circuit is activated, putting the activated. In addition, IC401 pin 27 (LINE
IC into stop status which is maintained for about MUTE) is opened 416ms after the PLAy button
four seconds. During this time, Do change can be is pressed, thereby releasing the line mute status
effected by pressing any of the other operation to enable play mode operations to commence.
control buttons.
PINCH
PLAY SOL.,
-'l--------{1
LINE MUTE
Llct6msl-
(oPEN) RTE
(GNO)
REC
ALTNE
g/OUTPUT
Fig. 6-5 PLAY mode operation
3. RecordingMode
When a cassette half with its erasure prevention 7 switching the signal path to the recording circuit.
tabs intact is loaded in the deck, pin B (AR) of And the IC401 pin 24 (PINCH SOL) changed to
IC4OL is switched to ('H" level, thereby enabling '6H" level,
tape transport is commenced. pin 22
the deck to be switched to recording mode. (BIAS OSC) is opened 52ms after the REC button
When the REC button is pressed, IC401 pin 4 is pressed, thereby activating the bias oscillator.
tnEel is changed to "L" level. PitjlO (REC) is Pin 27 (LINE MUTE) and pin 28 (REC MUTE)
also changed to "L" while pin l-g (REC) is open. are opened 416ms after the REC button is pressed,
As a result, the REC indicator lights up and the thereby releasing the line mute and recording mute
reed relay (RY501) is switched off, therebyT status to permit recording to start.
PUSHUP
HEAO BASE
Fn prNcH AAIO PINCH
fi-0- bsc.
ie;ri5 - -
SOL. z
P I N C HS O L .
ROLLER
CASSETTE HAtf
r-152m#
WITH E.P TABS I
IS LOADEO r44,t6rnsf --
I RECMUTE B|ASOSC.
I
I r-rrue
uure
)-lqe.n,t!, -
nEi
t
| ^-^
L------r
REC
TO OPEN
('H' LEVEL)
REC/PB. .\LINE
HEAD g/UJTPUT
+12v A)
L I N EI N P U T 'H'ACTVE
H'ACTIVE
Fig. 6-6 REC mode operation
4. Fast Forward Mode lights up. And since pin 27 (LINE MUTE) of
('H"
When the FF button is pressed IC401 pin 8 this IC is changed to level, the signal circuit is
(TD is changed to "L" level, followed by pin muted. If the REC and PAUSE buttons are both
26 (FF SOL) being changed to "H" level 416ms pressed,IC401 pin 20 tnEel and pin Zf IFAUSE-)
later. Q50L is thus turned on, activating the FF are changed to "L" level, resulting in both the
solenoid to start fast forward operation. REC and PAUSE indicators lighting up, and the
signal circuit being switched to recording circuit.
Furthermore, pin 27 ts opened, permitting output
O5Ol: OFF(z146ms)-ON of the signal to LINE OUTPUT, but since pin 28
has been changed to 66H" level, recording mute
mode is maintained.
REC MUTE
LINE MUTE
q
Fig. 6-7 FF mode operation pause$lX
BUrroN x
5. Rewind Mode F i s .6 - 9 P A U S Emodeoperati on
When the REW button is pressed, IC401 pin
7 (RE-W)is changed to "L" level, followed by pin
25 (REW SOL) being changed to "H" level 416ms . PLAY-PLAY MUSE
later. Q502 is thus turned on, activating the REW tc4o4
solenoid to steut rewind operation.
+,;
f.frqp"t-
0502:OFF(4{6ms}-ON
+lx
;
REW
BUTTON
F i g . 6 - 1 0 P L A Y P A U S E o d eo p e r a t i o n
m
Fig.
6-8 REWmodeoperation
. STOP-REC PAUSE
r--r lC4O4
6. Pause Mode
The pause mode in this deck is released by
pressing the PAUSE button. The pause mode is
E0Y?5*or
not released by pressing the PLAY button during
play/pause mode, or the REC button during re-
REc +
cording/pause mode. Note, however, that pressing BUTTON
the PLAY button during recording/pause mode
switches the deck to play/pause mode, and pressing
the REC button during play/pause mode switches
the deck to recording/pausemode.
If the PAUSE button is pressedduring stop mode,
pin 2 (FAttSE) and pin 21 (PAUSE) of IC401 are
both changedto "L" level, thereby lighting up the
PAUSE indicator. When both the PLAY and
PAUSE buttons are pressed, IC401 pin 2L is F i g .6 - 1 1 R E CP A U S E o d eo p e r a t i o n
m
changed to '(L" level, and the PAUSE indicator
12
7. MS Operation 8. Auto-stop Mode
When the FF or REW button is pressed with A photo-interrupter output is applied to pin
the MS button ON, tape transport is stopped at the 16 (END PULSE) of IC401 during tape transport,
blank portion of tape between tunes, and then resulting in the capacitor connected to pin L7
recommenced in play mode. When the FF button (C408) being charged up and dischargedrepeated-
is pressed with the MS button ON, IC401 pin 24 ly. The potential at pin 17 is thus kept below the
(PINCH SOL) is changedto "H" Ievel for 312ms. threshold voltage, and prevents activation of the
The pinch solenoid is thereby activated and the auto-stop mechanism.
head base starts to rise. Pin 23 (MS SOL) of IC401 When tape travel stops and the take-up reel stops
((H" turning, the photo-interrupter output is no longer
is changed to level 260ms after the FF button
is pressed,resulting in Q504 being turned on and applied to pin 16, and the potential on the ca-
the MS solenoid being activated. Following com- pacitor connected to pin 17 (C408) continues to
pletion of the "power assist" operation, the head increase until it exceeds the threshold voltage.
base is thus moved to the MS position. The FF The IC is thus switched to stop mode, thereby
solenoid is activated 416ms after the FF button is stopping tape mechanisms.
pressed, resulting in fast forward tape travel.
During this action, a fast forward playback signal
is applied to pin L3 (SIGNAL IN) of IC401, and
if this signal is interrupted for about 84ms (cor-
responding to a portion of blank tape between
tunes) IC401 switches to playback mode auto-
matically. The above operation is much the same
when the REW button is pressed instead of the
FF button. Fig. 6-13 Tape travel detection
IOFF(416ms){fil
'-leiemsf -- -{
; FF SOL.
iot.l (32ms)
L - - - - - - - - MUSIC SEARCH
I otN
(CUE)
:MS
; soL.
Q)1+zeo'*-
FFi
I
'
i.____-l'!u_r_q
L|NE
obl}$,,
Fi g.6-12 MS operati on
9. Timer Start Operation
Timer recording, timer playback and off modes
are attained by changing the potential of IC401
pin 18 (TIMER) to * Vcc, ground, and open
respectively.
When a cassette tape with erasure prevention tabs
intact is loaded, and the POWER switch is switched
ON with the TIMER switch (S409) in the TIMER
REC position, recording mode is started about
four seconds after the power comes on. If the
erasure prevention tabs have been removed, how-
ever, the tape deck remains in stop mode.
If the POWER switch is switched ON with the
TIMER switch in the TIMER PLAY position,
playback mode is started about four seconds
after the power line voltage is established.There is
no timer start operations when the TIMER switch
is left in the OFF position.
. TIMER REC
t\,tc
REC
orr o TIMER
er-av
t STANOBY
flr
TIMER
(s409)
CASSETTE ALF H
W I T HE . P T A B S
IS LOADED
F ig.6- 14 T i me rs ta rto p e ra ti o n
6.3 MECHANICAL OPERATIONS
PlaybackMode
The CT-X5 makes use of the capstan torque Gearleverreturnspring(E)
Flywheel
when shifting the head base during playback mode.
Camgear(D)
(Both the recording/playback and erase heads are Gearlever(F)
mounted on the head base).
Capstangear
o StopMode (seeFig.6-151
The head base shift mechanism during stop
mode is shown in Fig. 6-15. Operating lever (A)
presses down towards cam (C) due to operating
lever spring (B). With cam (C) combined with cam
gear (D), clockwise torque is applied to this cam
gear. Solenoid P is inactive, and the hook of gear
Operating
lever(A
leveiS[ring (Bl Hebdbasedrive pin
Solenor=E"liOperating
ilffi
lever (F) is kept against stopper (G) of cam gear
(D) by the cam gear return spring (E), thereby Fi g.6-15 S TOPoperati on
keeping cam gear (D) stationary. The flywheel is
belt-driven by the capstan motor, and rotates
counterclockwise together with the capstan gear.
14
Switch to Playback Mode from Stop Mode
( s e eF i g . 6 - 1 6 )
1. Solenoid P is activated O , ffid the hook of
gear lever (F) is releasedfrom stopper (G) O .
2. Operating lever (A) is presseddown onto cam
(C) by operating lever spring (B) O , carn
gear (D) rotates @ and engagescapstan gear
(H)o
(B)
-+
Fig.6-18 STOP PLAYoperation
3
o Operation Different
of Parts
As can be seen in Fig. 6-18, the head base
drive pin of operating lever (A) rises during play-
back mode. This pin forces the head base up
S o l e n o i dP '"' lE
through the action of the HB drive spring. The
pinch compressor spring is also lifted at the same
Fig.6-16 STOP + PLAY operation
- 1 time, forcing the pinch roller into close contact
with the capstan. Furthermore, the brake plate is
Switch to PlaybackMode from Stop Mode lifted to release the reel brake. Pressure is also
(see ig.6-17)
F applied to the idler arm, resulting in the TU
3. Cam gear (H) continues rotating due to idler transmitting drive gear rotation to the TU
capstan gear (H) @ , ffid cam (C) pushes reel base (the drive gear being belt-driven by the
operating lever (A) up O capstanmotor). (seeFig. 6-19).
4. After cam (C) pasises the point of maximum
lift, cam gear (D) disengages capstan gear
(H) @
Drivegear
TU reel base
TU i d l e r
F i s . 6 - 1 9Generation of take-up torque
- (D)
F i g . 6 - 1 7S T O P+ P L A Yo p e r a t i o2
- n
o Switchto PlaybackModefrom StopMode
(see ig.6-18)
F
5. Operating lever spring (B) forces operating
lever (A) to press against cam (C) Q) ,
thereby tending to continue the rotationary
motion of cam gear (D), but since stopper
(G) catches the arm of gear lever (F) (E ,
cam gear (D) stops rotating and operating
lever (A) becomes stationary (playback
mode).
Switch StopModefrom Playback
to Mode Rewind Operation
(seeFig.6-20) When solenoid R is activated (see Fig.6-22'1,
1. When solenoid P is deactivated O , the arm
the drive arm is moved to the left, and the drive
of gear lever (F) is disconnected from stopper gear on the arm engages the supply reel gear result-
(G) bV the action of gear lever retum spring
ing in rotation of the supply reel base. At the same
(E) (D time, the pin at the tip of the drive arm pushes the
2. Operating lever spring (B) forces operating
brake plate up, thereby releasingthe reel brake.
lever (A) against cam (C) (D , resulting in
rotation of cam gear (D) @ and lowering
of the head base drive pin @ Brakeplate
3. Stopper (G) catches the hook of gear lever Brakeshoe
S ol enoi dR Brakeshoe
(F), stopping the mechanism in the condition
shown in Fig. 6-15 (stop mode). -
Supply reelbase
Drivegear
Brakeplate
Drivearm
Fig.6-22 Rewind
operation
MS Operation (Music Search)
(B) MS operation involves combination with fast
forward and rewind operations similar to cue and
Fig.6-20 PLAY+ STOP
operation review operations. At the beginning of MS opera-
tion, po\Mer is applied to solenoid P, resulting in
the playback operation outlined in Figs. 6-16, 6-17
Fast Forward Operation
and 6-18 being effected in very short period of
When solenoid F is activated, the drive arm is time, the head base being lifted by capstan torque.
moved to the right, and the drive gear on the arm During this period, power is also supplied to the
engages the idler gil, resulting in rotation of the PMS solenoid. Although solenoid P is soon re-
TU reel base as shown in Fig. 6-2L (the drive gear leased, the PMS solenoid maintains the head base
being belt-driven by the capstan motor). At the through the stopper lever. Since this PMS solenoid
same time, the pin on the branch of the drive arm is. designed to maintain only the head base, the
pushes the brake plate up, thereby releasing the pinch roller and TU idler are released. This is
reel brake. followed by power also being supplied to solenoid
F or solenoid R, resulting in cue or review opera-
Brakeplate SolenoidF tion respectively.
Brakeshoe
Note: If MS operation is started after fast forward or
rewind mode has already started, solenoid F or
solenoid R is released temporarily, and reactiuated
after a brief period of playback mode (mechanically
Drivegear speahing).
TU reel base
Brakeplate
Dr iv ear m Drivearm bracketpin
Fig.6-21 Fastforward operation
-
2
T.EXPLODEDVIEWS
A
B
C
./
\..-2' 6//
D ..aa''
2t--_
-/ -A
20' 22
-l 17 1 I
T
T L
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