Sharp VZ-3000H User manual

SHARP SERVICE MANUAL
ATSM68 107 1MCT
VZ-3000H/E_
CP-V300H
VZ-3000H/E
CP-V300H
In the interests of user-safety the set should be
restored to its original condition and only parts
identical to those specified be used,
(The record in the photo is not an accessory.)
Main Unit: VZ-3000H
Speaker Box: CP-V300H
OO
®
@
APSs
Noise reduction system manufactured under license from Dolby Laboratories
Licensing Corporation. “Dolby” and the double-D symbol are trademarks eee
of Dolby Laboratories Licensing Corporation. : Auto Program Search System
Photo
\ INDEX TO CONTENTS
FEATURES»
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ADJUSTMENT
OF
TUNER
CIRCUIT
..........
18
~20
SPECIFICATIONS
........2c
cscs
eeenee
eset
eneonn
2
CP-V300H
(SCHEMATIC
DIAGRAM/WIRING
VOLTAGE
SELECTION
.......ccccececn
cece
ee
eees
2
CONNECTION/EXPLODED
VIEW)...............
20
NAMES
OF
PARTS
.....
cc
cece
ceee
cree
e
rene
enone
3
SCHEMATIC
DIAGRAM
(1/4
~
4/4)
..........
21
~28
DISASSEMBLY
........
ccc
eee
ee
eee
eee
eee
4~6
WIRING
SIDE
OF
P.W.
BOARD
(1/3
~
3/3)
....
29
~34
DIAL
CORD
STRINGING
..........00e
eee
e
ee
eens
6
EXPLODED
VIEW
(PLAYER/CABINET/
SETTING
OF
PLAYER
WIRE
......-...00es
cere
eens
6
TAPE
DECK)
....--.seeeeseene
near
esnee
35
~39
BLOCK
DIAGRAM
.....
ce
cece
cece
ene
recente
ees
7
EQUIVALENT
CIRCUIT
CIRCUIT
DESCRIPTIONS
.........00--0e0e
eee
8~14
{BLOCK
DIAGRAM)
OF
IC
...............
40
~
42
ADJUSTMENT
OF
TAPE
DECK
MECHANISM
....
14,
15
TYPES
OF
TRANSISTOR
AND
LED
...........-...
42
ADJUSTMENT
OF
PLAYER
MECHANISM
.....
15~17
GAUTION
2204)
ses
ckiedieed
aching
ets
cna
coca
nine
ae
%
43
ADJUSTMENT
AND
CHECK
OF
RECORD/
AC
POWER
SUPPLY
CORD
WIRING
CONNECTIONS
,.
43
PLAYBACK
AMPLIFIER
CIRCUIT
...........--.
17
-
REPLACEMENT
PARTS
LIST
...............
44
~Back
PACKING METHOD............ccee eee cece eens Back
FEATURES
<VZ-3000H/E>
<CP-V300H>
®
Automatic
playing
of
both
sides
of
a
record.
@
Atthe
speaker
section:
e
Fully
automatic
control
of
the
record
with
microcomputer
Bass
ref.
type
2-way
speaker
system
and
linear
tracking
mechanism.
16
cm
free
edge
woofer
®
Compact,
space-saving
vertical
player.
LC
type
network
SHARP CORPORATION OSAKA, JAPAN

@
For
a
complete
description
of
the
operation
of
unit,
please
refer
to
the
operation
manual.
<VZ-3000H/E>
General
Rated voltage:
Power consumption:
Dimensions
(Main
unit):
Weight
(Main
unit):
Input
sockets:
Quiput sockets:
Outer sockets:
Semiconductors:
Amplifier Section
Circuit:
Power output:
Total harmonics
distortion:
Frequency response:
Tone controls:
Tuner Section
Circuit:
Frequency range:
Intermediate
frequency:
Sensitivity:
Separation:
S/N:
<CP-V300H>
Speaker Section
Cabinet type:
Speakers:
Frequency range:
Crossover frequency:
SPECIFICATIONS
AC 110 V, 220 V, 240 V, 50/60 Hz
230 W
597(W) x 170(D) x 378(H) mm
14.6 kg
Microphone: 1 mV/10K ohms,
$6.3 mm jack
Aux (P.B.): 190 mV, 47K ohms
Aux (REC): 130 mV, 100K ohms
Speaker: 4 ohms
Headphones: 8 ohms, 46.3 mm jack
FM antenna: FM 300 ohms balanced
MW/LW antenna: outside antenna
Ground: MW/LW antenna ground
1 LSI, 17 ICs, 1 FET, 54 transistors,
56 diodes, 7 LEDs, 2 photo-
transistors, 3 photo-interruptors
2 infrared emitting diodes
OCL power amp with + power supply
RMS; 25W x 2 at 0.5% THD, 4 ohms
0.1% (4 ohms at 20W output)
40 Hz ~20 kHz +1.5 dB
Bass: +9 d8 (100 Hz)
Treble: +9 dB (10 kHz)
Superheterodyne FM/MW/LW tuner,
PLL stereo demodulaticn circuit,
FM muting circuit built-in
FM: 87.6 ~108 MHz
MW: 520 ~1,620 kHz
LW: 148.5 ~285 kHz [VZ-3000H]
150 ~ 285 kHz [VZ-3000E]
FM: 10.7 MHz
MW/LW: 455 kHz [VZ-3000H]
465 kHz [VZ-3000E]
FM: 2.0uV at S/N 26 dB, 40 kHz
dev.
MW/LW: 350uV/m
FM: 36dB (1 kHz FM stereo)
FM: 70dB (monaural 1 kHz)
Bass ref. type 2-way speaker system
16 cm free edge woofer
5 cm tweeter
60 ~ 20,000 Hz
2,500 Hz
Woofer high-cut; 6 dB/oct
Tweeter low-cut; 12 dB/oct
VOLTAGE
SELECTOR
ADJUSTMENT
The
voltage
selector
is
located
on
the
rear
panel
of
the
deck.
If
adjustment
is
necessary,
use
a
screwdriver
in
order
to
turn
the
selector
in
either
direction
until
the
correct
voltage
figure
is
displayed
in
the
window
next
to
the
adjustment
screw.
Cassette Deck Section
Recording tracks:
Recording system:
Erasing system:
Head:
Motor:
Tape speed:
Fast forward time:
Rewind time:
Wow & flutter:
Frequency response:
S/N:
Player Section
Type:
Motor:
Drive system:
Speeds:
Wow & Flutter:
S/N:
Tonearm:
Cartridge:
Supplied devices:
Maximum rated input:
Impedance:
Sound pressure level:
Dimensions:
Weight:
4 track 2 channel stereo system
AC bias (85 kHz)
AC erasing system (85 kHz)
Record/playback head x 1, Erase
head x 1
Electronic control DC motor
4.8 cm/sec.
100.sec. (C-60 tape)
. 100.sec. (C-60 tape)
0.2% (DIN).
Normal tape: .30 ~ 14,000 Hz
Chrome tape: 30 ~ 15,000 Hz
Metal tape: 30 ~16,000 Hz
Dolby NR off: . 52 dB
Dolby NRon: 62dB
{Metal tape, over 5 kHz)
Microcomputer control, Linear
tracking full auto, Belt drive
DC motor with FG (for platter drive)
x1,
DC motor (for tonearm drive) x 1
Belt drive system
33-1/3, 45 rpm
0.085% (DIN)
66 dB (DiN-B)
Dynamic balanced, Linear tracking
VM type
Frequency response:
20 ~ 20,000 Hz
Output voltage:
2.8 mV (1 kHz, 50mm/sec.)
Exchangeable stylus: STY-121
Automatic door open/close, auto
lead-in, auto return, auto record
size sensing, automatic speed selec-
tion, dual play, repeat play
50 W (MPQ)
4 ohms
89 dB/Wm
220{W) x 220(D) x 378(H)mm
4.7kgx1
* Specifications for this model are subject to change without
prior notice.

<VZ-3000H/E>
2
Front
Parts
23
Tape Deck Parts
24
35
Control Parts
36
37
38
39
40
41
42
43
44
Rear Parts
45
46
47
48
49
50
51
<CP-V300H>
Speaker Parts %
1 Tweeter
2 Woofer
NAMES OF PARTS
Power Switch
Side B Play Indicator
Dual Play {ndicator
Repeat-Play Indicator
Side A Play Indicator
Player Door
Signal Meter
FM Stereo Indicator
Function Selector Buttons
Volume Control Knob
Tuning Control Knob
Tape Counter
Tape Counter Reset Button
Player Door Open/Close Key
Play/Cut Key
Tonearm Cue Key
Tonearm Forward Key
Tonearm Reverse Key
Dual Play Key
Repeat-Play Key
Side A/B Selector Key
Headphones Jack
Microphone Jacks
APSS Indicator
Dolby
NR
Indicator
29-3031
32
39°34
36
is
ab
a
6
QD
Record
Indicator
Figure
3-2
Tape
Deck
Parts
Figure
3-3
Contro!
Parts
Cassette Holder
Tape Level Meter
Cassette Eject Button
Record Button
Play Button
Stop Button
Rewind Button
Fast Forward Button
Pause Button
ig oa @
Speed (33/45) Selector Key
Dolby NR Switch
Tape Selector Switches
Loudness Switch
Record Level Control Knobs
Bass Control Knob
Treble
Control
Knob
i
Balance
Contro!
Knob
i
ah
4
4
Mic
Mixing
Knob
Antenna Sockets
AUX (REC/P.B.) input Socket
Hole
to
open
player
door
in
case
of
power
failure.
Speaker
Socket
Beat Cancel Switch
AC Power Supply Cord
Voltage Selector
Figure 3-5
Speaker Parts
pal Yee

DISASSEMBLY
Cautions on Disassembly
ance:
outlet before starting to disassemble the set.
2. Take cassette tape and record out.of the unit.
<VZ-3000H/E>
REMOVAL OF DUST COVER
1, Remove two screws from the dust cover. See Figure 4-1.
2. Pull out the dust cover in the arrow direction shown in
Figure 4-1, holding its lower part.
REMGVAL OF PLAYER DOOR FRONT COVER
1. Remove the dust cover in the same way as in “Al
REMOVAL OF DUST COVER.”
2. Remove six hocks shown in Figure 4-2, and pull out the
play door front cover (its upper half must be taken off first
and then its lower half.)
[C] REMOVAL OF REAR LID
1. Remove ten screws at the rear lid shown in Figure 4-3, and
take it off.
[D] REMOVAL OF CABINET
1. Remove the dust cover and rear lid in the same ways as in
“TA] REMOVAL OF DUST COVER" and “{C] REMOVAL
OF REAR LID.”
2. Disconnect two connectors (JCN901, JCN902) shown in
Figure 4-4,
3. Remove eight screws at the cabinet shown in Figure 4-4.
4. Pull out eight knobs shown in Figure 4-5, and depress the
cassette eject button to open the cassette holder.
5. Push the door lever shown in Figure 4-4 with a pencil or the
like, and open the door.
6. Bring down the. set with its rear side facing downwards,
remove eight screws from the cabinet, and take out the
cabinet by holding its both sides: do not touch the player
door. See Figure 4-5.
* For easier removal of the cabinet, it is advised. to remove
two screws at the player mechanism.
[E] REMOVAL OF PLAYER MECHANISM
1. Remove the cabinet in the same way as in “[D] REMOVAL
OF CABINET.”
2. Remove two holders from the P.W. Board (PWB-B2) shown
in Figure 5-2.
3. Pull out two sockets (CNS13, CNS514) shown in Figure 5-1.
4, Remove six screws from the player mechanism shown in
Figure 5-1, and take the mechanism off.
{F] REMOVAL OF TAPE MECHANISM
1. Remove the cabinet in the same way as in “(D] REMOVAL
OF CABINET.”
2. Pull out four sockets (CNS201,
CNS852) shown in Figure 5-3.
3. Remove four screws from the tape mechanism shown in
Figure 5-2 and counter belt, and take the mechanism off.
CNS202, CNS851,
[G] REMOVAL OF CASSETTE HOLDER
1. Remove the cabinet in the same way as “(DI REMOVAL
OF CABINET.”
Follow the below-mentioned notes when disassembling the set
and reassembling it, to keep its safety and excellent perform-
1. Be sure to remove the power supply plug from the wall
3. Take off nylon bands or wire holders where they need be
removed when disassembling the set. After repairing the set,
be
sure
to
rearrange
the
leads
at
where
they
have
been
before disassembling.
4.
Take
sufficient
care
on
station
electricity.
of
integrated
circuits
and
other
circuits
when
repairing.
Figure 4-4
Figure 4-5
2. Detach the control indication plate shown in Figure 5-4, by
removing binding agent and four hooks. Remove one screw
from the cassette holder, and take the holder off.
* At left of the cassette holder there is a spring.
* When reassembling the contro! indication plate, secure it
with binding agent.
a

a
[H] REMOVAL OF CONTROL LID
1.
Remove
the
cabinet
in
the
same
way
as
in
“(D]
REMOVAL
OF
CABINET.”
2. Push the control lid at its w marked portion, and open it.
3,
Push
the
control
lid
in
the
arrow
direction
shown
in
Figure
5-4,
and
remove
it
(first
the
part
(1)
and
then
the
part(2)).
*
Remove
the
spring
at
right
of
the
control
lid.
[i] REMOVAL OF P.W. BOARDS
* Prior to disassembling each P.W.B., remove the cabinet
in the same way as in “[D] REMOVAL OF CABINET.”
1. Control P.W.B. (PWB-D2)
@
Remove
three
screws
from
the
P,W.B.
shown
in
Figure
5-2, and take it off.
2. Tape deck P.W.B. (PWB-D5)
@ Remove three sockets (CNS201, CNS202, CNS203) and
four screws from the P.W.B., and take it off.
3. Tuner P.W.B. (PWB-D1)
@
Remove
seven
function
selector
buttons
shown
in
Figure
5-2 from the left side by using a screwdriver, without
injuries to the buttons. Then remove two screws and dial
cord.
®
Remove
three
screws
and
one
socket
(CNS101)
from
the
P.W.B. shown in Figure 5-3, and take it off.
4. Power P.W.B. (PWB-C2) with heat sink
@ Remove one socket (CNS401) and six screws fromthe
PWB and heat sink shown in Figure 5-3, and take the
P.W.B. (with heat sink) off.
5. Power block (PWB-C1)}
@ Remove seven screws from the power block shown in
Figure 5-3, and take it off.
Note:
*Remove two screws and five push-rivets from the
insulating cover,
* When replacing the power IC or transistor, apply silicon
grease between it and heat sink.
6.
Speaker
socket/beat
cancel
switch
P.W.B,
(PWB-C7,
PWB-
D6)
@
Remove
two
screws
from
the
bracket
shown
in
Figure
5-3,
7. LED drive P.W.B. (WPB-C3)
@ Remove one socket (CNS901) and two screws from the
P.W.B. shown in Figure 5-3, and take it off.
8. Signal meter P.W.B, (PWB-C6)
@ Remove one socket (CNS101) and one screw from the
P.W.B. shown in Figure 5-3, and take it off.
9. Microphone jack P.W.B. (PWB-D3)
@ Remove two nuts from the P.W.B. shown in Figure 5-2,
and take it off.
10. Volume P.W.B. (PWB-D4)
@ Remove one nut from the P.W.B. shown in Figure 5-2,
and take it off.
11, Headphones jack P.W.B. (PWB-C4)
@ Remove one nut from the headphone jack shown in
Figure 5-2. Then take the headphone jack P.W.B. off.
12.
Meter/tape
indicator
P.W.B.
(PWB-C9,
PWB-C8)
@
Remove
four
screws
from
the
P.W.B.
shown
in
Figure
5-5, and take it off.
13. DIN Socket P.W.B. (PWB-D7)
@
Remove
two
hooks
from
the
antenna
terminal
bracket,
shown in Figure 5-3, and take it off.
@)
pte
——_
CONTROL LID fA}
~Sey
Figure 5-4
5
3
PLAYER MECHANISM
Figure 5-5

14.
Tape
mechanism
P.W.B.
(PWB-E)
®@
Remove
the
tape
mechanism
in
the
same
way
as
in
“(F]
Me
saet
er
Fe
pe
Ge
REMOVAL
OF
TAPE
MECHANISM.”
re
@
Remove
one
screw
from
the
record
selector
lever,
two
screws
from
the
motor
bracket
and
one
screw
from
the
P.W.B.
shown
in
Figure
6-1.
Then
take
the
P.W.B.
off.
15,
Microcomputer
P.W.B.
(PWB-B1)
@
Remove
the
player
mechanism
in
the
same
way
as
“(E]
REMOVAL
OF
PLAYER
MECHANISM.”
®
Remove
four
screws
from
the
P.W.B.
shown
in
Figure
6-2,
and
take
it
off.
Figure
6-2
<CP-V300H>
REMOVAL
OF
SPEAKER
BOX
1.
Speaker
net
@ As shown in Figure 6-3, pull the net in the arrow
directions in the numerical order (1), (2),@) and (). The
parts @ and must be removed by using a bladed
screwdriver.
Figure
6-3
2.
Speaker
slated
@
For
removal
of
the
speaker,
see
Figure
20-4.
screwdriver
DIAL
CORD
STRINGING
cm.
@
Setting
order:
®
1.
Turn
the
drum
fully
counterclockwise
{at
the
highest
TY
hy
een!
|.
—
see
nn
frequency
position},
and
put
a
hook
of
the
spring
in
the
hole
of
the
drum.
2.
Proceed
with
stringing
in
the
numerical
order
from
1)
to
®.
Pointer iaazt
3.
After
the
stringing,
turn
the
dial
drive
shaft
fully
counter-
ai
2
<
.
ae
.
.
uM
(472;
clockwise
(at
the
lowest
frequency
position),
and
align
the
=
:
center
of
the
pointer
to
zero
point
of
the
dial
scale
plate.
“O'Point
Cf
2Turns
4Turns
Figure 6-4
SETTING OF PLAYER WIRE
® Setting order Pe eae aera
1. Set the drum at its rest position, and put a hook of the
spring in the hole of the drum.
2.
Stretch
the
wire
in
the
numerical
order
from
to
(2.
3. After setting the wire, set the side A tonearm and side B
tonearm at their lead-in positions. Refer to the instructions
in “POSITIONAL ADJUSTMENT OF TONEARM LEAD- ®
IN
POSITION.”
—
Se
Spring (273)
ae y° 7
) Rest Pasition
Pulley
(294)
©
a
“ZX
Gear
Block
(289)
Drum
Pulley (294) a y ;
Pulley (293) (3 ue
Side A Tonearm @
Pulley (2a) '
Ht
ow a pret my!
1903mm ~_ )
ee
sre
oe
S
®
Wire wr
@
Figure 6-5

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CIRCUIT DESCRIPTIONS
<OUTLINE OF PLAYER CONTROL SECTION >
KEY CONTROL SECTION
This section is made up of nine keys, and each key is of the
lock-out type and its chattering time is limited to 40 msec.
1. Player door open/close key
Key for opening and closing the player door.
2. Play/cut key
Enables to begin playing a record and to stop it while it is
playing — this is effective when the player door is closed.
When the tonearm is at its rest position (at right for side A,
or at left for side B), player operation starts when this key
is pushed: when the tonearm is not at its rest position, the
key functions as cut key.
3. Tonearm cue key
Enables cue up and cue down motion of the tonearm while
a record is being played. It is used to keep or cancel cue up
mede when the set is not playing a record.
4. Side A/side B selector key
Changes side A play and side 8 play. With this change, the
tonearm moves to a lead-in position, which results in
playing of the back side of a record which you are listening
to.
5. Tonearm forward key
Enables to move the tonearm toward the optional portion
on a record (to later selections}. The tonearm can move
until pushing the key is stopped.
6. Tonearm reverse key
Enables to move the tonearm back to the optional portion
on a record (to previous selections). The tonearm can move
until pushing this key is stopped.
7. Speed (33/45) selector key
Enables to manually change the speed for a record.
8. Dual play key
Enables to play side A (or side B} followed by automatic
play of side B (or side A). The dual play is cancelled by
pushing the key again.
9. Repeat play key
Enables to repeat play of side A or side B. The repeat play
is cancelled by pushing the key again.
SENSOR SECTION
1. Player door open sensor
The skelton switch detects that the play door is opened
completely.
2. Player door close sensor
The skelton switch detects that the player door is closed
completely.
3. EP record misload sensor
The microswitch finds an error that an EP record is loaded
in the LP record holder.
4. Tonearm rest position sensor
The skelton switch detects that the tonearm is at its rest
position (at right for side A, at Seft for side B).
5. Tonearm position sensor
When the tonearm is out of its rest position, the photo-
sensor produces four pulses to detect how far from the rest
position the tonearm is situated.
&. EP/LP sensor
With the player door closed, the photosensor works to
detect that an EP or LP record is loaded or that neither is
loaded.
INDICATOR SECTION
1. Side A play indicator
Lights up when side A play is instructed by the side A/side
B selector key and when side A of a record is being played.
2. Side B play indicator
Lights up when side B play is instracted by the side A/side
B selector key and when side B play of a record is being
played.
3, Dual play indicator
Lights up when dual play is instructed by the dual play key
and when side A (or side B) of a record is played followed
by automatic playing of side B (or side A).
4, Repeat play indicator
Lights up when repeat play is instructed by the repeat play
key and when a record is played repeatedly. Each indicator
lights up when it receives “high” level signal from the
microcomputer.
Figure 8-1
Dua! play indicator
Repeat play indicator
ie 4 play indicator
Figure 8-2
TONEARM CONTROL SECTION
Forward/reverse motion of the tonearm and also its up/down
motion are controlled by the microcomputer’s signals to be
applied to the cartridge motor and tonearm solenoid.
® Output signal (D12) for side B tonearm solenoid: the
tonearm moves down when the signal is at “high” level.
® Qutput signal (D117) for side B tonearm solenoid: the
tonearm moves down when the signal is at “high” level.
® Output signal (D3) for cartridge motor low speed rotation:
the motor rotates at low speed when the signal is at “low”
level.
® Output signal (D4) for cartridge motor forward rotation:
the tonearm rotates forwards when the signal is at “low”
level.
® Output signal (D5) for cartridge motor backward rotation:
the tonearm rotates backwards when the signal is at “low”
level.
PLAYER DOOR CONTROL SECTION
Opening and closing of the player door is controlled by the
microcomputer’s signals to be applied to the gear changeover
solenoid (to change the gear blocks) and to the cartridge
motor (in the tonearm control section).
® Output signal (D9) for gear changeover solenoid: the gear
blocks are changed when the signal is at “high” jevel.
_3—-

®@ Output signal (D4) for cartridge motor forward rotation:
the cartridge motor rotates forwards when the signal is at
“low” level {with the player door opened).
® Output signal (D5) for cartridge motor backward rotation:
the cartridge rotates backwards when the signal is at “low”
level (with the player door closed).
* The cartridge motor rotates at any time at high speeds.
PHONO MOTOR CONTROL SECTION
Side A or side B play is selected by the microcomputer's
signals to be applied to the phono motor: the motor rotates
forwards for side A play, and rotates backwards for side B
play.
® Output signal (D6) for phono motor high-speed rotation:
the motor rotates at high speeds (45 r.p.m.) when the signal
is at “‘low’’ level.
@ Output signal (D7) for phono motor forward rotation: the
motor rotates forwards when the signal is at “low” level.
® Output signal (D8) for phono motor backward rotation:
the motor rotates backwards when the signal is at “low”
level.
MUTING
Muting occurs when the output signal (D10) from the
microcomputer is at “high’’ level.
< FUNCTIONS OF PLAYER CONTROL SECTION >
WITH POWER ON
The
microcomputer
starts
operating
when
the
power
switch
is
turned on, and the VZ-3000H/E is first set as follows:
1.
The
tonearm
returns
to
its
rest
position
if
it
has
been
at
the
other
position.
2.
Side
A
of
a
record
is
ready
to
be
played
when
the
player
door
has been
locked
completely.
3.
When
the
player
door
has
been
closed,
the
microcomputer
detects
whether
there
is
a
record
in
the
compartment
or
not,
If
it
is
loaded,
its
side
A
is
ready
to
be
played:
in
the
case
of
EP
record,
the
speed
is
set
at
45
r.p.m.
and
in
the
case
of
LP
record
it
is
set
at
33
r.p.m.
If
an
EP
record
is
loaded
by,
mistake
in
the
LP
record
holder,
the
door
is
opened,
and
side
A
of
a
record
is
ready
to
be
played.
DOOR OPEN OPERATION
When the door has been closed, it opens when the player door
open/close
key
is
operated
or
when
the
microcomputer
finds
that an EP record is loaded in the LP record holder.
1. When the tonearm is out of its rest position with the door
closed, it returns to the rest position, then the door is
allowed to open.
2.
All
the
indicators
are
put
off
while
the
door
is
opening.
When
the
opening
completes,
side
A
of
a
record
is
allowed
to
be
played.
*
Any
key
operation
is
impossible
while
the
door
is
opening.
DOOR CLOSE OPERATION
When the door has been opened, it is closed when the player
door
open/close
key
is
operated:
it
is
impossible
when
the
tonearm
is
moving
forwards
or
backwards,
and
when
the
microcomputer
detects
that
an
EP
record
is
loaded
in
the
LP
record
holder.
1.
While
the
door
is
closing,
if
the
microcomputer
detects
EP
record
misloading,
the
door
stops
and
intends
to
open
again.
2. When the door is closed completely, the microcomputer
makes the tonearm return to its rest position if it has been
at the other position. The microcomputer also detects
whether a record is joaded or not and, if loaded, playing
starts: in the case of EP record, the speed is set at 45 r.p.m.,
and in the case of LP record, the speed is set at r.p.m. All
the indicators go off where no record is loaded. If an EP
record is misloaded in the LP record holder, the door, if
closed, will open.
PLAY START OPERATION
When
a
record
has
been
loaded
with
the
player
door
opened,
the
player
door
is
closed
when
the
player
door
open/close
key
is operated, then playing the record starts automatically.
Where
the
tonearm
is
at
the
rest
position
and
a
record
has
been
loaded
with
the
player
door
closed,
playing
the
record
starts
when
the
play/cut
key
or
tonearm
forward
key
is
pushed.
When playing starts, the tonearm moves at high speeds toward
its
lead-in
position
according
to
the
microcomputer’s
signals
to
decide
the
rotational
direction
and
speed
of
the
phono
motor;
then
the
tonearm
moves
down
to
the
record
(cue
up/down
operation).
*
At
the
lead-in
position,
the
tonearm
moves
forwards
when
the tonearm forward key is pushed.
PLAY CUT OPERATION
Play
cut
operation
is
allowed
when
the
tonearm
is
away
from
its
rest
position
with
the
player
door
closed.
It
starts
when
the
play/cut
key
is
operated
or
when
the
player
door
open/close
key is pushed to open the door.
1.
All
the
indicators
other
than
side
A
or
side
B
indicator
go
off
while
the
play
cut operation
is
performed.
2.
The
play
cut
operation
makes
the
tonearm
move
up
if
it
has
been
down
on
the
record
and
also
makes
the
phono
motor
stop
to
rotate.
TONEARM FORWARD OPERATION
When the player door is opened:
The
tonearm
moves
forwards
when
the
tonearm
forward
key
is
pushed.
1.
When
the
tonearm
forward
key
is
pushed,
the
tonearm
advances
to
EP
lead-in
position,
and
moves
down
to
the
tecord
surface.
However,
if
the
tonearm
has
been
inside
the
EP
lead-in
position,
it
remains
where
it is
when
the
tonearm
forward
key
is
pushed
and
then
moves
down
to
the
record
surface.
\\\) Record
Rest position
Return
position
Read-in
position
Figure 9
When the player door is closed:
The tonearm moves forwards when the tonearm forward key is
pushed, provided that a record is loaded and that the tonearm
is not at its returning process.
1, When the tonearm has been at the rest position, pushing the
tonearm forward key makes the tonearm move up and
brings it to its lead-in position. After the lead-in position,
the tonearm forward speed slows down but the tonearm
continues to move inwards unti! pushing the key is stopped.
2. After the forward operation completes, the tonearm per-
form, cue up or down operation according to the setting of
tonearm cue key.
3. If the tonearm reaches its return position with a continuous
push of the tonearm forward key, it automatically starts to
return toward the rest position.

TONEARM BACKWARD OPERATION
The tonearm moves backwards when the tonearm reverse key
is pushed, provided that the tonearm is away from the rest
position and the pfayer door is closed.
1. Where the tonearm is placed between the rest position and
lead-in position, play operation is cut when the tonearm
reverse key is pushed.
Where the tonearm is at any place between the lead-in
position and return position, the tonearm moves backwards
when the tonearm reverse key is pushed.
3. While the tonearm is moving down, pushing the tonearm
reverse key makes the tonearm move up and then back-
wards at low speed. The backward motion continues until
pushing the key is stopped.
4. After the backward operation completes, the tonearm
performs cue up or cue down operation according to the
setting of the tonearm cue key.
5. If the tonearm moves back until it reaches the place
between the lead-in position and rest position, the set gets
in repeat play mode so that the tonearm again moves
toward the lead-in position of the same record as previously
played. Then the tonearm performs cue up or cue down
operation according to the setting of the tonearm cue key.
CUE UP/CUE DOWN OPERATION
Record play stops temporarily when the tonearm cue key is
pushed, and it resumes from that position when the key is
again pushed. Temporary stop of record play is called cue
up operation while its restarting is cafled cue down
operation.
Cue up operation changes to cue down operation and vice
versa each time the tonearm cue key is pushed.
® Cue down operation
j. Cue up state is cancelled and the side A or side B play
indicator goes off.
2. Cue down operation lasts 1 second, and 2 seconds later the
muting is canceliled.
3. If the tonearm cue key is pushed while the cue down
operation is performed, cue up operation starts.
® Cue up operation
1. Cue up operation starts, and the side A or side B play
indicator blinks (with approx. 3 Hz signal).
2. Cue up operation lasts 1 second. Muting occurs for 290
msec before cue up operation has started.
3. It is not possible to push the tonearm cue key while cue up
operation is performed, thus no cue down operation being
allowed.
SIDE A/B SELECTION
Side A play or side B play is selected by pushing the side A/B
selector key. During cue down operation, this selection starts
after the tonearm has been raised up.
1. The tonearm returns to the rest position and then moves
into the lead-in position of the back side of the record you
are listening to. Then the tonearm will perform cue up or
cue down operation according to the setting of the tonearm
cue key.
2. While the tonearm is returning to the rest position, the play
indicator blinks (with approx. 3/2 Hz signal) to show that
the back side of the record you are listening to will next
begin playing from the beginning.
3. There is a time delay of about 1 second when the phono
motor changes its direction: about 1 second after this
change, the motor stops and then restarts rotating in the
reverse direction. And it takes about 1 second for the
motor to be set at its normal r.p.m.
These time delays are to keep a safe side A/B selection of a
record to be played.
AUTO RETURN FUNCTION
When side A or side B play is finished, the tonearm is lifted off
the record, it goes back to its rest position and the record
stops revolving. If the tonearm has been in cue down position,
it performs cue up operation and returns to its rest position.
1. If only the repeat play key has been pushed, one side of the
record is played repeatedly.
tf both the repeat play and dual play keys have been
pushed, both sides of the record are played repeatedly.
2. For one side repeat play, when side A (or B) is finished, the
tonearm returns to the rest position and the same side
begins playing again from the beginning. For dualside
repeat play, when side A (or B} is finished, the tonearm
returns to the rest position and the side B {or A), or the
back side of the record you are listening to, begins playing
from the beginning: if the tonearm cue key has been
pushed, the tonearm performs cue up operation before
playing the back side has started.
3. Unless both the repeat play and dual play keys have been
pushed, the tonearm cue key once pushed is ineffective
during the auto return operation.
4. During the auto return operation in one side repeat play,
the play indicator blinks (with approx. 3/2 Hz signal) to
show that the same side as you are listening to will begin
playing again from the beginning: during the auto return
Operation in dual side repeat play, the play indicator blinks
{with 3/2 Hz signal) to show that the back side of the
record you are listening to will begin playing.
SIGNALS FROM SENSORS TO MICROCOMPUTER
1. Detection of tonearm position
Performed by using SW504, LEDS05 and a gear drum.
SW504 is the sensor which detects that the tonearm is at
the rest position. LED505 is the sensor which detects that
the tonearm is at the lead-in or return position. The outputs
from these sensors are shown in Figure 11-1, which are
applied to pin (R13) and pin (R12) of the
microcomputer.
2. Detection of EP/LP record loading or no loading
LED501 and LED502 sense whether an EP or LP record is
loaded or not loaded, and their outputs which are shown in
Table 10-1 are applied via Q538_(for EP record) or Q539
(for LP record) to pins @7) and of the microcomputer.
Table 10-1
LP record
detection
EP record
Load condition detection
No loading
Mis-loading
EP record loaded
LP record loaded
Note:
The content of ‘’Mis-loading” in this table is different from
that of “3. EP mis-loading detection” next described.
3. EP mis-loading detection
If an EP record is loaded by error into the LP record
holder, SW501 turns on and its output signal {at “low”
level) is applied to pin (D,) of the microcomputer.
4, Player door close detection
Closing the player door causes SW502 to turn on, and its
output signal {at “low” level) is applied to pin (D,) of
the microcomputer.
—10—