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C)rrloNeerl'
ORDERNO.
aa ARP-I47-O
STEREO TAPE DECK
CASSETTE
cT-73cI
MODELCT.T3OCOMES FIVE VERSIONS
IN DISTINGUISHED FOLLOWS:
AS
Typ. Voltrg Remarka
KU 120V only U.S.A.model
HE 22OV and 24OV {Switchablel Europe model
HB 22OVa^d 24OV (Swirchable) United Kingdom model
HP 22OVa d 24OV (Switchable) Australia model
D 12OV22OV and 24OV (Switchable) Gengral export model
o This service
manualis applicable the KU, HE, HB, HP and D types,
to
o Ce manueld'instruction serefdreau mode de r6glage. fangais.
en
. Estemanualde serviciotrata del m6todo de ajusteescritoen espafrol.
CONTENTS
1 . S P E C TC A T | O N S . . . .
|F . 8. E L E C T R I C A L A R T SL I S T .
P 25
2. F R O N TP A N E L F A C I L I T I E S 9. PACKING z6
3. B L O C KD I A G R A M 1 0 . P . C .B O A R DC O N N E C T I O N I A G R A M
D 2S
4. C I R C U I TD E S C R I P T I O N S 11. SCHEMATIC IAGRAM
D J5
5. D I S A S S E M B L.Y. . . .
. 14 1 2 . A D J U S T M E N T S. . .
. 37
6. PARTS LOCATION to REGLAGE 44
7. E X P L O D E O I E W SA N D P A R T SL I S T . .
V 18 AJUSTE . 51
PICINEEFI ELECTFICINIC CCIFIPCIF|ATION a-r, Mesu.o 1 cho.ne. Mesu.o-ku, rokyo.1s3. Jape.
PIC,NEEFI ELECTFIC,NICB lNC. '1925 E. Dom,nguez St.,
IUAAI Long E]each. Ca ronnra 9OB1O U.S.A.
PIC'NEEFI ELECTFIC'NIC IEUFIC'PEI N.v. Lu thagen Hsven 9, 2O3O Antwe.p, Betg,um
FIC'NEEFI ELECTFIG,NICA AUATF|ALIA PTY. LTEI. '178-184 Boundanv Fload.
E!.aesde, V,cto.r6 3195, Ausr.atia
Y Z @ [ 4 A Y 1 9 8 2 P r i n r e dn J a p a n
i
1. SPECIFICATIONS
systems compact cassette,2-channel stereo
Heads ."Hard Permalloy,, recording/playback head x l
Miscellaneous
PowerRequirements
"Ferrite" erasing head x 1
Motor KU model;AC 120V,60Hz
. DC servo motor x 1
Wow and Flutter No more than 0.0S% (WRMSI
HE, HB, Hp modets;
AC22OVl24OV (switchabtel,50/60H2
Fast Winding Time . Approximately 1OOseconds (C-60 tape) D modet; AC12OVl22OVl240V (switchabte). 50/6OHz
Frequency Response PowerConsumotion
-20d8 recording: KU,HE,HB,HPmodets. .......2SW
Normal tape Dmodel ...21W
25 to IS,OOOHZ
(35 to 14,000H2 t3dB) Dimensions . . 4 2 0 ( W )x 1 0 1 ( H l x 2 3 5 ( D ) m m
Chrome tape . 25 to 16,000H2 1 6 - 9 / 1 6 W )x 4 ( H l x 9 - t / 4 ( D l i n
(
(35 to 15,000H2 13dB) Weight(withoutpackage! ... 4 . 2 k g ( 9l b 4 o z l
Metal tape . 26 to 17,OooHz
(35 to 16,000H2 r3dB)
FurnishedParts
Signal-to-Noise atio
R
Operating instructions 1
Dolby NR OFF . . . More than STdB Connection cord with pin plugg . . . 2
Dolby NR ON More than 67dB (over SkHz)
Harmonic Distortion No more than 1.2% (OdB)
Input NOTES:
(Sensitivity/Maximumallowable input/lmpedance) 1. ReferenceTapes: Normal & LH: DIN 4SE13/BLATT6 or
MIC(L,Rl . . . . . . . 0.3mV/57mV/10kO,6mmdiam.jack e o ul v .
( R e f e r e n c eM I C i m p e d a n c e ;2 5 O O t o 1 O k O l CrO" DtN 4Sb13/BLATTT (CrO" ) or
LINE{INPUT) ..50mV/25Vl75k0 e q ui v .
Output ( Reference tevel/Load impedancel 2. Reference Recording Level: Meter OdB indicating levet (160
LINE(OUTPUT).... ....4SOmV/SOka nwb/m magnetic level = Philips cassette reference levell
3 . R e f e r e n c eS i g n a l : 3 3 3 H 2
4. Wow & Flutter: . JIS [3kHz, with accustic compensation
(weighted) rms valuet DIN [3,'tsOHz, with acoustic com-
Subfunctions
pensation(weighted)PEAK valuel; DIN 45507
o Dotby NR system (ON/OFF) B type
g. Frequency Response: o Measured at -20d8 level, DOLBy
. 3 position tape selector (NORM/CrO, /METAL) NR
o lC full logic control O F F , l e v e ld e v i a t i o n i s r 6 d B w i t h o u t i n d i c a t i o n .
. Air damp eject function 6. Signal to Noise Ratio: o Measured at the third harmonic
o Full automatic stop mechanism d i s t o r t i o n 3 % l e v e l ,w e i g h t e d ( D l N 4 5 5 1 3 / B L A T T T ) .
r REC muting function 7. Sensitivity: Input level (mV) required for reference recording
o Music search function levelwith input (REC) controls set to maximum.
. Timer stand-by mechanism 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 o f i n p u t
(REC) level controls and increasing level at input jacks, this is
. One-touch recording system
. the maximum input level (mV) at the point where recording
LED level meter
o Auto function svstem amplifier output waveform becomes clipped.
9. Reference Output Level: Playback output level when meter
indicates odB.
NOTE:
Specifications and the design subject to possible modificetions
without notice due to improvements
2^
I
2. FRONT PANEL FACILITIES
o POWER
SWTTCH DooR
@cesserrE
When this switch is depresed, the power is turned on and the level
indicator '!-" lights. Depress the switch again to release it when oTAPE COUNTER
turning off the power to the deck. This counter shows the position of the tape using a three-digit
O The muting circuit is actuated after the POWER switch has meter.
been set to ON and there will be no operation for about 4
s e c o n d s .T h i s i s n o t a f a i l u r e o r m a l f u n c t i o n . REsET
@coururEn BUTToN
o When the POWER switch is set to the OFF position while the Depress this button to reset the tape counter display to "000".
r tape deck is operating, the deck's operation is released and the
stop mode is established.
) LEVEL INDICATOR
These indicate the input level during recording and the output
)TIMER START SWITCH level during playback.
This switch is used when an optional audio timer is employed for
unattended recording or wake-up playback operations. Keep this @ p'-"-ttNDlcAToR
switch at the OFF position when the timer is not being used. This indicator lights during the playback or recording mode. When
REC : Set to this position to set the tape deck automatically the PAUSE switch is depressed and the PLAY/PAUSE or REC/
to the recording mode at the time preset on the audio PAUSE mode is established, the indicator goes off.
timer and to start the recording of programs unattended,
for instance. I m (Music INDICATOR
Search)
OFF : For when the timer is not being used. This indicator lights while the music searchswitch is kept in the
PLAY : Set to this position to set the tape deck automatically to depressed position.
the playback mode at the time preset on the audio timer
and to start the playback. The tape playback function can @ ruusrc
SEARcH
swrrcH
be used to wake-up in the morning instead of an alarm When this switch is depressed and the >> {FF} or << (REW}
clock. switch is depressed, the unrecorded blanks between the program
For detailed instructions on the use of this function, refer to on the cassette tap are detected and the deck is automatically
RECORDING AND PLAYBACK USING THE AUDIO TTMERon set to the playback mode.
page'10.
F
oEJECTBUTTON
Depress this button to open the cassette holder. To close the
cassette holeer, push the top back until it locks.
o Do not press this button when the tape is in motion.
(DopeneilNc swrrcHEs (D PAUSESWITCH
Depress this switch to stop the tape temporarily during recording
>> lFFl : Depress this switch to send the tape forward at or playback. Depress this switch again to allow the tape to con-
high speed (The tape will travel from left to tinue to travel. When this switch is depressed to the ON position,
right). the ll (PAUSE) indicator will be illuminated.
<< IREWI : Depress this switch to rewind the tape at high . The tape does not stop during fast forwardor rewind opera-
speed (The tape will travel from right to left). tions even when the PAUSE switch is depressed.
- (STOPI : Oepress this switch to stop the tape travel and to
rt
releasethe operating switches.
@ Mtc JAcKs
These are the input jacks for microphone recording. plug the left
@ DOLBY NR SWTTCH channel microphone into the L jack and the right channel micro-
Depress this switch to ON for recording with the built-in Dolby phone into the R iack.
Noise Reduction system and for playback of tapes which have
been recordad using the Dolby Noise Reduction system.
For other taps. do not press this switch.
DOLBY NOISE REDUCTIONSYSTEM
@ rnee sELEcr
swtrcHEs The tape hiss (noise in the high-frequency region) which is in-
This selector allows the bias and equalizer characteristics to be herent to cassette tapes and which is heard when sound recorded
selected during recording and equalizer characteristics during onto a tape is played back has always been annoying.
playback in line with the type of tape you are using. This is particularly the case when, for instance. during an orches-
Normal tapo : Release the bottom switch to the ,,out,. position tral piece high-rangp pianissimo sections such as those created by
(INORM}. violins are heard. The Dolby noise reduction system was devoloped
Chrom tape : Depress the bottom switch to the ,.in,, position to rduce this noise. lt functions when the midrange and treble
( - HIGH) and release the top switch to the parts where the tape hiss is noticeable are lower than the fixed
level by recording these parts at a higher level then the normal
"out" Position ( r CrOz ).
Metal tape : Depress both the top and bottom switches to recording level. During playback. however. the level is reduced by
the "in" positions. an amount equivalent to its increse during playback.
o The DOLBY NR switch should always be set to ON when play-
(E)
RECLEVELcoNTRoL ing back a tape which was recorded using the Dolby noise re-
duction system. The high frequency sound will not be heard
Use this to adjust the level of the input signals from the MIC jacks
properly when a tape which was no recorded using the Dolby
or rear panel LINE-lNPUT. Turning the control to the clockwise
system is played back with the DOLBY NR switch at ON.
increase the level.
(D RECSWTTCH
The word "Dolby" and D0 are trdemark of Dolby Laboratories
Depress this switch to start tape recording. This switch will not
Licensing
Corporation.
work when a cassette is not loaded or when the erasure prevention
Noise ReductionSystemmanufactured under licensefrom Dobly
tabs of a loaded cassette have been broken off.
Laboratories
Licensing
Corporation.
When this switch is depressed to th ON position, the REC and
lpLA? indicators will be illuminated.
(D RECMUTESWTTCH
Depressing this switch during recording makes it possible to
create an unrecorded blank on the cassette tape only for the time
during which the switch is kept depressed. This switch is used for
providing blanks of the required length between programs and
editing tapes so that they are easier to listen to and for creating
the unrecorded blanks which are required for operating the
MUSIC SEARCH facility.
o No signal are recorded when the switch is touched during
recording. Do not touch the switch unless necessary.
o REC MUTE (O ) is display only but does not illuminate.
3. BLOCK DIAGRAM
LINE
IN P U T
r FLAT AMP
MPX FILTER
t_ 20d8 _l
EOUALIZER MP
A
REC/PB Head
CONTROL IRCUIT
C
Function Switch
VR3OI
@
silol
6b{
* Qeog
BIAS CIRCUIT
5
20 dB
M E T E RC I R C U I T
D O L B YN R C I R C U I T REC AMP
+B
n
\
)N
-
s r 0 2|
)FF
Rch
a
xt$_L
-n | f,uerar
{l
L------ --dl
?NORM CrO?
sro3-3 sro4-2
LINE
Dsrg Qt o 8
1 OUTPUT .r
SWITCHES:
SlOl I INPUT SELECTOR LINE _ MIC 5604: PLAY ON - OFF
SI02 : DOLBY NR ON _ OFF _OFF
s605: PAUSE ON
SIO3 . TAPE SELEC'OR lvoRM - HrGt{ _
SlO4 : TAPE SELECIOR CTOA - METAL
5606: REC ON OFF
{,
5607: REC MUTE ON - OFF
s 6 0 8 : M U S | C E A R C HM S )
S ( ON - OFF
s@t I FF -
Auto Function oN q!!
s90l I TttrER REC-OFF-PLAY
5602 : REw ON - OFF
Srool : PowER ON - OFF
s603: sToP oN -oll
S t l O l r E R A S EP R E V E I I TO ' E C T O R
HOLE-N9_r9!E
Thc undcrlrncd irdicatd thc sitch polrton.
IC60l
Pin POWER UPPLY
S
@ KU: 120V 60Hz
H E , H B , H P : 22Ovl24OV 50/60H2
+Bt (t2.3V) D: 120V 1220V1240V50/60H
PLAY
+ 82(il.5v)
+83
+ B 3( t O . 8 V )
+84( 5V)
4. CIRCUIT DESCRIPTIONS
4.1 PLAYBACK CIRCUIT
The signal from the playback head is amplified between circuits, see the block diagram on page b
by the Q10UQ102 2-stage direct-coupled ampli- and in Fig. 4-1.
fier. In the NORM position, the playback equali-
zation (120ps) compensation is achieved by the Operationsduring Each Mode
NF circuit between the Q102 collector and Q101 The mechanical operations effected by the
emitter. In the METAL and CrOz positions, Q104 following circuit changes are described in the next
is turned on, and the equalization characteristics chapter (seepage 11).
switched from 120ps to 70ps to compensate the
frequency response. The level of the EQ AMP 1. When the POWER Switch is Switched ON
output is set by a variable resistor, and further Then the POWER switch is switched on, * 5V is
amplified by the Q105 flat amplifier before being applied to pin 1 (Vcc) of IC601. During the initial
passed through the MPX filter and applied to pin period when pin 1 voltage is being increased from
2 of the Dolby IC. 0V to 5V (approximately from 0.6V to 2.4V) the
>tA This Dolby circuit consists of IC401 (HALL226), IC's internal reset circuit is activated, putting the
and the Dolby ON/OFF switch is linked to the IC into stop status which is maintained for about
MPX filter ON/OFF switch. When the Dolby four seconds. During this time, no change can be
switch is OFF, the 19kHz filter is bypassed. effected by pressing any of the other operation
The Dolby circuit output appears at pin 8 of control buttons.
IC401, and is passed to LINE OUTPUT via a
switching IC (ICa02). rc60r PM9OO2 A
4 . 2 R E C O R D I N GC I R C U I T P AU S E
t\ The input signal from the microphone jack is
AR
arnplified by the microphone amplifier IC101, and
passed via the MIC/LINE selector switch to the REC REC
INPUT volume control where the input level is REC/PB head
pt-Ay
adjusted. This adjusted signal is passed via IC102 REc
to flat amplifier Q105. D101 and D102 in the stage STOP PAL'SE
before IC102 form a protector circuit designed
to protect ICLO? from large input signals. The REW BIAS Erase
osc head
signal amplified by the flat amplifier is pa.ssedvia
FF
the MPX filter to pin 2 of the Dolby IC, the output
appearing at pin 8. The level of this output is MS
adjusted by variable resistor. Then after equaliza- s 9 0|
PLAY
tion in the REC AMP (IC403) in accordance to
OFF TIMER s607
the type of tape being used, the signal is passed *, ------J pg6 REC
MUTE
to the recording head. +B R E CM U T E
SIGNAL
4.3 CONTROL CIRCUIT
MS
The control circuit in this deck utilizes a one-
chip IC (PM9002A) which enables feather-touch PrNcH tiUF,
operations. In addition to mechanism control,
REw
this IC also includes music search (MS), auto-stop, "11&.
END
and timer start functions. And due to the digital r F
DETECT
counter frequency divider system employed in TIME
timing settings for the mechanism control, all
operational timing discrepancies have been elimi-
nated. The PM9002A pin layout is shown in
Fig. 4-3, the functional block diagram in Fig. 4-2, Fi g.4-1 C ontrolsystem ockdi a gr am
bl
and the output pin time charts during different
modes in Figs. 4-5 and 4-6. For interrelations
2. Play Mode 4. Fast Forward Mode \
When the PLAY button is pressed, the level of When the FF button is pressed IC601 pin 8
pin 5 1Pf,AY) of IC601 is switched to ,,L" level, (TF) is changed to "L" level, followed by pin
and the level of pin 24 (PINCH SOL) to ..H,' 26 (FF SOL) being changed to "H" level 416ms
level. Q603 is turned on and the pinch roller later. Q601 is thus turned on, activating the FF
activated. In addition, IC60L pin 27 (LINE solenoid to start fast forward operation.
MUTE) is opened 416ms after the PLAY button
is pressed, thereby releasing the line mute status 5. Rewind Mode
to enable play mode operations to commence. When the REW button is pressed, IC601 pin
7 (RED is changed to "L" level, followed by pin
3. RecordingMode 25 (REW SOL) being changed to "H" level 416ms
When a cassette half with its erasure prevention later. Q602 is thus turned on, activating the REW
tabs intact is loaded in the deck, pin B (AR) of solenoid to start rewind operation.
IC601 is switched to '3H" level, thereby enabling
the deck to be switched to recording mode. 6. PauseMode
When the REC button is pressed, ICO01 pin 4
The pause mode in this deck is released by
tnECl is changed to "L" level. pin 20 (nnd) is pressing the PAUSE button. The pause mode is
also changed to "L" while pin 19 (REC) is open.
not released by pressing the PLAY button during
As a result, the REC indicator lights up and the play/pause mode, or the REC button during re-
reed relay (RYl01) is switched off, thereby
cording/pause mode. Note, however, that pressing
switching the signal path to the recording circuit.
the PLAY button during recording/pause mode
And the IC601 pin 24 (PINCH SOL) changed to
('H" switches the deck to play/pause mode, and pressing
level, tape transport is commenced,. Pin 22 the REC button during play/pause mode switches
(BIAS OSC) is opened 52ms after the REC button
the deck to recording/pause mode.
is pressed, thereby activating the bias oscillator.
If the PAUSE button is pressed during stop mode,
Pin 27 (LINE MUTE) and pin 28 (REC MUTE)
pin 2 (PAUSE) and pin 21 (PAUSE) of IC601 are
are opened 416ms after the REC button is pressed, \
both changed to "L" level, thereby lighting up the
thereby releasing the line mute and recording mute
PAUSE indicator. When both the PLAY and
status to permit recording to start.
( P M 9 0 0 2l
REC vcc R E CM U T E
OFF -. \
PLAY plusE LINE TIUTE
ENO an
PULSE FF SOL.
REC R E WS O L .
pr-iT
INPUT P I N C HS O L .
KEY
SIGNAL IN
L c h >4\.-{ sr6F OUTPUT MS SOL.
REW BrAS OSC
FF
PAUSE
T FF SOL.
MS RET
MS REW SOL.
T IM ING REC
PINCH SOL
NOISE
FILTER MS SOL. SENSE TIMER
t
l__
TIMING STA D.BY
N
iT N OI S E AUTO
Timing
EET
-
clck OSC
F IL .
Aurol STOPTIME
| |
sr-6F &
S I G NA L I I sroPl
divid!r
L_,.
FLfY IN E N OP U L S E
TEE
GNO NFB
PAUSE
AT { I
Fi g . 4- 2 P M 900 2 Ai n te rn a b l o c kd i a g ra m
l Fi g.4-3 P M9002Api n l ayout
PAUSE buttons are pressed, IC601 pin 2L is 9. Timer Start Operation
('L"
changed to level, and the PAUSE indicator Timer recording, timer playback and off modes
lights up. And since pin 27 (LINE MUTE) of are attained by changing the potential of IC601
this IC is changed to 6'H" level, the signal circuit is pin 18 (TIMER) to * Vcc, ground, and open
muted. If the REC and PAUSE buttons are both respectively.
pressed, IC601 pin 20 tn-Edl and pin Zf lFeUSny When a cassette tape with erasure prevention tabs
are changed to "L" level, resulting in both the intact is loaded, ffid the POWER switch is switched
REC and PAUSE indicators lighting up, and the ON with the TIMER switch (5901) in the TIMER
signal circuit being switched to recording circuit. REC position, recording mode is started about
Furthermore, pin 27 is opened, permitting output four seconds after the power comes on. If the
of the signal to LINE OUTPUI, but since pin 28 erasure prevention tabs have been removed, how-
has been changed to "H" Ievel, recording mute ever, the tape deck remains in stop mode.
mode is maintained. If the POWER switch is switched ON with the
TIMER switch in the TIMER PLAY position,
7. MS Operation playback mode is started about four seconds
When the FF or REW button is pressed with after the power line voltage is established. There is
the MS button ON, tape transport is stopped at the no timer start operations when the TIMER switch
blank portion of tape between tunes, and then is left in the OFF position
recommenced in play mode. When the FF button
is pressed vrith the MS button ON, IC6 Ot pin 24 10. Auto-function Operations
(PINCH SOL) is changed to "H" level for 312ms. o When TapeDeckis Switched Playback
to Mode
The pinch solenoid is thereby activated and the When the CT-730 is switched to playback
head base starts to rise. Pin 23 (MS SOL) of IC601 mode pin 27 of PM9002A is changed to '3L"
is changed to '3H" level 260ms after the FF button level, and the Q606 collector to "H" level. Pin 20
is pressed, resulting in Q604 being turned on and of PM90O2A is also changed to "H" level, resulting
the MS solenoid being activated. Following com- in Q308 being turned off, followed by Q307 also
pletion of the "poler assist" operation, the head
being turned off and the collector being changed to
base is thus moved to the MS position. The FF ('H"
Ievel. The output of IC602 (414) thus be-
solenoid is activated 416ms after the FF button is comes ('L" level and the output of IC602 (gl4)
pressed, resulting in fast forward tape travel. 6'H" level.
Q608 is turned on, a negative pulse is
During this action, a fast forward playback signal passed to the amplifier component, and the ampli-
is applied to pin 13 (SIGNAL IN) of IC601, and fier is automatically switched to tape mode.
if this signal is interrupted for about 84ms (cor-
responding to a portion of blank tape between o When Amplifieris Switched TAPE
to
tunes) IC601 switches to playback mode auto- When the amplifier TAPE function selector is
matically. The above operation is much the same switched, a negative output pulse is passed from
when the REW button is pressed instead of the the amplifier's automatic switching terminal. This
FF button. pulse is differentiated by C604, resulting in pin 5
of PM90O2A being changed to "L" level. Playback
8. Auto-stop Mode mode is thereby started just as if the PLAY button
(5604) had been pressed.
A photo-intermpter output is applied to pin
16 (END PAUSE) of IC601 during tape transport, o When Amplifier Switched PHONO
is to
resulting in the capacitor connected to pin L7 When any of the other amplifier function
(C318) being charged up and discharged repeated- selectors apart from TAPE (such as PHONO) is
ly. The potential at pin 17 is thus kept below the pressed, a positive pulse output is obtained from
threshold voltage, and prevents activation of the the amplifier's automatic switching terminal.
auto-stop mechanism. This pulse is differentiated by C603, resulting in
6'H" level being applied to IC602 (Ll4),
When tape travel stops and the take-up reel stops and the
turning, the photo-interrupter output is no longer IC602 (214) output being changed to "H" level.
applied to pin 16, and the potential on the ca- Q609 is thus turned on, resulting in the CT-730
pacitor connected to pin 17 (C318) continues to being switched to stop mode, just as if the STOP
increase until it exceeds the threshold voltage. button (S603) had been pressed.
The IC is thus switched to stop mode, thereby
stopping tape mechanisms.
o When TapeDeckis in Recording
the Mode Automatic
While the tape deck is in recording mode, pin 20 switching
of PM9002A is at "L" level yvith Q307 on. The
IC602 (414) output is thus at "H" level, and the ---tlU L a:r
IC602 (314\ output level at"L" level. Hence, when H qtq (H) 3/4
a positive pulse is applied by C603, the TC6O2 tc602
oFF
(Ll4) output remains at "H" Ievel, preventing the t/4
deck from being switched to stop mode. L I rceoz ,h
That is, the tape deck recording mode is main-
MUrE
tained when other function selectors on the am- PMgoo2A
plifier are pressed.
( l : during recording mode
Fig. 4-4 Auto-functionoperation 1
o Timing Chart
Normal operation MS : OFF
a
\Key input PLAY STOP
t r I r l t L l r r o t & u & *
FF STOP REIY STOP REC/PAUSE PAUSE STOP REC STOP PAUSE PAUSE PLAY PAUSE
\ M"d"- REC PAUSE
STO P PLAY STOP FF STOP REW STOP REC STOP REC STOP STOP PLAY PAUSE
T"rrfi\ STANO.B' STOP
LINE MUTE
( Pin 27) L
I L t_ t_ I
REC MUTE
l Pin 28) L t_ t_ a
REC
( Pin 20l L J J
H
REC
( Pin l9) I I
H
B|AS OSC
( Pin 221 J J
H
PINCH SOL.
( Pin 24 1
FF H
J
SOL.
( Pin 26l t
REW SOL.
l Pin ZsI
H
H
r
MS SOL.
1 Pin 231
PAUSE H
l Pin 2t, L
t
F i g .4 -5 P M 9 0 0 2 Ati me chart (W henMS sw i tchi s OFF)
Normal operation MS SW: ON Direct change
STOP REW FF STOP PLAY STOP REC STOP REC FF REC PAUSE
REVIE W
LINE MUTE
( Pin 27 1
REC MUTE
( Pin 28 I
BrAS OSC
( Pin ?2')
PINCH SOL,
( Pin 291
FF SOL.
( Pin 261
RE|V SOL.
( Pin 25)
MS SOL.
( Pin 23)
PAUSE
Pin 2
t F i g .4 -6 PM9 002Ati me chart (W henMS sw i tchi s ON )
l- 4.4 MECHANICAL OPERATIONS
PlaybackMode
The CT-730 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). Stopper (G)
Capstangear
il#,"
o StopMode(see Fig.4-71
The head base shift mechanism during stop
mode is shown in Fig. 4-7. Operating lever (A)
presses down towards cam (C) due to operating
lever spring (B). With cam (C) combined with cam Operating
gear (D), clockwise torque is applied to this cam lever (
gear. Solenoid P is inactive, and the hook of gear Soleno
lever (F) is kept against stopper (G) of cam gear
(D) by the cam gear return spring (E), thereby Fi s.4-7 S TOPoperati on
l* keeping cam gear (D) stationary. The flywheel is
belt-driven by the capstan motor, and rotates
counterclockwise together with the capstan gear.
Switch Playback
to Modefrom StopMode
(seeFig.4)
1. Solenoid P is activated O , ild 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 engages capstan gear
(H)o
(B)
-+
Fig.4-10 STOP PLAYoperation
3
o Operation DifferentParts
of
As can be seen in Fig. 4-10, ttre head base -
drive pin of operating lever (A) rises during play-
back mode. This pin forces the head base up
'"' lGt
through the action of the HB drive spring. The
Solenoid P
pinch compressor spring is also lifted at the same
Fig. 4-8 STOP-+ PLAY operation1 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
(se e ig. 4- 9)
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 cerm (C) pushes reel base (the drive gear being belt-driven by the
operating lever (A) up O capstanmotor). (see Fig. 4-11).
4. After cam (C) passes the point of maximum
Iift, cam gear (D) disengages capstan gear
(H) @
Drivegear
TU reel base
TU i dl er
Fi g.4-11 Generati on take-up
of torque
(D)
-+ 2
Fig.4-9 STOP PLAYoperation
Switchto PlaybackModefrom StopMode
(see ig.4-10)
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) @ , ,n,
cam gear (D) stops rotating and operating
lever (A) becomes stationary (playback
mode).
Switchto StopModefrom Playback Mode Rewind Operation
(seeFig.4-121
When solenoid R is activated (see Fig. 4-14),
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 engagesthe 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) @ , 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
(F), stopping the mechanism in the condition SofenoidR I I Brakeshoe
shown in Fig. 4-7 (stop mode).
Supply reel base
Brakeplate
Drivearm
Fig.4-14 Rewind
operation
MS Operation (Music Search)
(B) MS operation involves combination with fast
forward and rewind operations similar to cue and
Fig.4-12 PLAY-+ STOPoperation review operations. At the beginning of MS opera-
tion, power is applied to solenoid p, resulting in
Fast Forward Operation the playback operation outlined in Figs. 4-8, 4-g
and 4-LO being effected in very short period of
When solenoid F is activated, the drive arm is
time, the head base being tifted 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. 4-LB (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 aleady started, solenoid F or
solenoid R is released temporarily, and reactiuated
after a brief period of playbach mode (mechanically
Drive gear speaking).
TU reel base
Brakeplate
Drivearm Drivearm bracketpin
F i g . 4 - 1 3 F a s tf o r w a r do p e r a t i o n
5. DISASSEMBLY
Mechanism assembly
o
8
I
II
zI:
q.@)
I
I
I
F3
_t 0tl Sub panel base
laI|
$iL
R
(,
Door assembly
@
/-\
Fig.5-1 Disassembly
Bonnet and Tape Mechanism
1. Unscrew the four screws Q holding the Bon-
net on and remove the Bonnet by sliding it
toward the rear.
2 . Unscrew the sub-panql screw @ and gently
press down on hook G) with a screwdriver so
the sub-panel can be pulled loose.
3 . Unscrew the two sub-panel base screws O
and remove the sub-panel base. The eject,
stand-by and power knobs can now be re-
moved.
4 . Remove the REC VR knob and the two screws
below @ and gently press down on hook @