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—

5. Player door open detection
Opening
the
player
door
causes
SW503
to
turn
on,
and
its
output
signal
{at
“low”
level}
is
applied
to
pin
40)
{Do)
of
the microcomputer.
PLAYER CONTROL KEYS OPERATION TABLE
Effective range of each player control key is variable according
to
which
mode
the
set
is
being
situated
in,
which
is
shown
in
Table 11-1.
Table 11-1
ail Sees
Rest position sensor 7
1
1
1
Position detection t
pulse
'
4
}
4
;
Res’
Rest
(LP)
(EP)
(LP)
(EP)
Read-in
position
Return
position
Figure 11-1
Note:
Mark
©;
With
each
key
pushed,
the
corresponding
mode
is
obtained.
Mark
4;
With
each
key
pushed,
the
corresponding
mode
is
obtained
but
with
other
mode
accompanied.
Mark
*;
With
the
reverse
key
pushed,
the
tonearm
moves
backwards
only
after
it
has
moved
forwards,
when
the
player
cord
door
is
1 2 3
Key code
4 5 6
Side A/
side B
Repeat
Dual play play
cue down
opened.
7 8 | 3
Piayer
Play/cut | Forwarded | Reverse 33/45 | door open/
close
Cue up/
ce)
Door is opened.
Door is closing.
Door is closed. (Record loaded,
tonearm at rest position}
Tonearm is placed between rest
position and lead-in position.
During playing.
During return.
O1O; O } O |O/O
Ofer); & |] O1010
O;O| O | O
During stop.
>
O;O
During cue up.
During cue down. A
Door is opening.
Door is closed. (Record not
loaded, tonearm at rest position)
<CIRCUITS AROUND THE MICROCOMPUTER >
POWER CONTROL CIRCUIT
This
circuit
consists
of
ZD501,
Q510,
Q540
and
(C504,
and
when
the
power
switch
is
turned
on,
it
controls
the
power
supply
(5
V)
to
be
less
than
10
msec
for
its
rising,
so
that
the
microcomputer
is
automatically
reset.
The
12
V
line
is
controlled
by
ZD501,
Q510
and
Q540
to
produce
a
power
of
more
than
6
V,
which
is
then
applied
to
pin
a
of
C504.
1C504
is
to
produce
a
regulated
power
of
Sv.
CARTRIDGE MOTOR HIGH SPEED/LOW SPEED
SELECTOR CIRCUIT
This
circuit
is
made
up
of
051,
O535
and
0537,
to
which
is
applied
the
signal
from
pin
1)
(D3)
of
the
microcomputer.
When
the
signal
from
the
microcomputer
is
at
“high”
level,
it
causes
0537
to
turn
on
and
O51
to
turn
off,
and
the
resultant
voltage
(11V)
is
applied
to
the
cartridge
motor
to
allow
it
to
rotate
at
high
speed.
On
the
other
hand,
when
it
is
at
“low’'
level,
it
causes
Q537
to
turn
off
and
Q51
to
turn
on,
and
the
resultant
voltage
(6V)
is
applied
to
the
cartridge
motor
to
allow
it
to
rotate
at
low
speed.
~1i-
Power supply
(BV)
Figure 11-2
CARTRIDGE MOTOR HIGH SPEEO/
LOW SPEED SELECTOR CIRCUIT
tev
[a
cervidgs
2SCIS53SY
motor
normal?
reverse
rotation
salsctor
circuit
28C2320F
zor
ADS ,2UB2
152475 of ISIS55
From pin(])
microcomputer
Dey
192473.
pe ISIS8E
GND
Figure 11-3

Q501/Q502~ 25a562¥
SELECTOR CIRCUIT 503 28c2320F
This circuit is made up of 0501 to 0504, 0506 and Q507, and 3505) coed
changes the power supply to make the cartridge motor rotate 28c2320F
in normal of reverse direction.
1. To make the motor rotate in normal direction (with player
door open operation, and tonearm backward operation):
In this case, the output from pin ® of the microcomputer Sasa pe TOR SHES
becomes “low” level to turn off Q507. With Q507 turned
off, Q606 and Q507 turn on so that pin @ and pin @ of
the motor are negative and positive respectively, thus
allowing the motor to revotve in- normal direction. Figure 12-1
2. To make the motor rotate in reverse direction (with player
door close operation, and tonearm forward operation):
In this case, the output from pin 6) of the microcomputer
becomes “low” level to turn off Q503. With Q503 turned
off, Q504 and Q502 turn on so that pin (4) and pin @) of
the motor are positive and negative respectively, thus SOLENOID
allowing the motor to revolve in reverse direction.
CARTRIDGE
MOTOR
NORMAL/REVERSE
ROTATION
CARTRIDGE
MOTOR
NORMALIREVEAGE
SELECtOR
cincUNT
ow
Fram
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micracomputer
isv
GEOR SOLENOID
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cay
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mf o/eay
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tox
CARTRIDGE MOTOR STOP CIRCUIT
When
both
pins
@
and
@
of
the
microcomputer
are
at
“high”
level,
O505
turns
on.
With
Q605
turned
on,
Q501
and
Q502
turn
on
to
get
shorted
the
motor
terminals,
the
motor
thus
stopping
immediately.
From sida A cartridga angla sensor:
0824 77]
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Qos o
Fram gin @)
micracomputar
SOLENOID DRIVE CIRCUIT
This
circuit
consists
of
Q519,
0520,
0523
to
0526,
Q530
and
0531, and drives the solenoids shown below.
1, Gear solencid (SOL561)
When the piayer door open/close key has been pushed, the
output from pin () of the microcomputer becomes “high”
level
to
turn
on
Q502
and
0519.
Then
Q531
and
0530
ripe
He
8
oui
sole
sree
turn on to charge C504 up, and the resultant power of 24 V
attracts the gear solenoid.
Thereafter this attraction continues with the power of
10 V.
2, Side A tonearm solenoid (SOL503)
When the tonearm cue key for the side A has been pushed
gears oy. 10K
‘O518
Ws2473
2528 ry| 2524 ange
‘
From pin
microcomputer
SOLENOID DRIVE CIRCUIT
the output from pin of the microcomputer becomes A) suet BE,
“high”
level
to
turn
on
O526
and
Q525.
The
same
operation
as
in
1
above
occurs
thereafter.
‘OND
3.
Side
B
tonearm
solenoid
(SOL502)
Figure
12-2
When the tonearm cue key for the side B has been pushed,
the
output
from
pin
g)
of
the
microcomputer
becomes
sia
tidiesendaa
“high”
level
to
turn
on
Q524
and
0523.
The
same
Output
from
ey
LEDS503
(or
LEDS04)
®
operation as in 1 above occurs thereafter. Light sensing Lea
: 20msec !
CARTRIDGE ANGLE DETECTOR/CARTRIDGE Output from pin@ TT \— 12v
FORWARD CIRCUIT o oeweet ® ss
This
circuit
is
composed
of
photo
sensor
LED503
for
side
A
L-
300-1
i
(or
LED504
for
side
B),
C51,
1C502,
051,
052i,
0522,
ga
av
Q535
and
0537,
and
controls
the
cartridge
forward
operation
Output
from
on
aa
=
:
when
a
record
is
playing.
ee
oS
ee
tog
At
the
start
of
playing
the
side
A
of
a
record,
the
tonearm
is
sheale
-
|
e—
12v
kept slantwise the angle of which is detected by LED503 (now Cartridge motor ofl, v |
there
is
no
light
emission
to
the
LED503),
and
the
resultant
cca
NOR,
NO
FOr
id
signal
(“high’’
fevel)
is
applied
to
pin
@
of
1C502.
Then
the
Operation
signal goes out of pin @ of IC502 and is fed to the oscillator Figure 12-3
circuit (IC51) and cartridge motor voltage control circuit
(051, 0535 and 0537).
The
“high”
level
signal
applied
to
the
oscillator
circuit
goes
The
oscillation
takes
place
between
pins
(1)
and
@)
of
2
NAND
out
of
pin
@,
which
is
a
pulse
shown
in
Fig.
12-3
to
drive
gate
circuit,
and
its
pulse
time
(30
msec)
is
decided
by
C51
0521,
the
output
of
which
is
reversed
in
polarity
to
be
fed
to
and
R58,
and
its
duration
(300
msec)
is
decided
by
C54
and
the cartridge motor normal/reverse rotation selector circuit. R56.
~12-

The
“high”
level
signal
applied
to
the
cartridge
motor
voltage
control
circuit
turns
on
Q537
and
about
900
msec
later
(this
time
is
decided
by
R599
and
C509)
it
turns
off
O51.
Therefore
as
shown
in
Fig.
12-3
©,
a
power
of
12
V
is
fed
to
the
voltage
control
circuit
when
Q51
is
turned
off
while
it
is
limited
to
6
V
by
ZD51
when
061
is
turned
on.
In
this
way,
the
voltage
to
be
fed
to
the
cartridge
motor
is
stabilized
as
shown
in
Fig.
12-3
O,
so
that
the
motor
rotation
is
quiet
with
no
vibration
and
noise.
As
a
result
of
forward
rotation
of
the
cartridge
motor,
when
the
tonearm
advances
to
reach
the
place
where
its
turning
angle
is
horizontal,
a
light
is
emitted
to
LED503,
whose
output
is
at
“low’’
level
and
causes
the
cartridge
motor
to
stop.
If
there
is
something
accidental
to
make
slantwise
the
cartridge
to
cause
its
erroneous
angle
to
be
detected
by
LEDS03,
Q522
turns
on
to
stop
the
cartridge
forward
motion.
SIDE
A/SIDE
B
SIGNAL
SELECTOR
CIRCUIT
This
circuit
consists
of
0529
and
RLY
11.
When
the
side
B
selector
button
is
pushed,
the
output
from
pin
©
of
the
microcomputer
becomes
“high”
level
to
turn
on
0529.
With
Q529
turned
on,
there
is
current
to
run
in
RLY11
so
that
side
A
play
is
changed
to
side
B
play.
When
the
side
A
selector
button
is
pushed,
0529
turns
OFF.
MUTING CIRCUIT
This
circuit
is
made
up
of
O11
(or
012).
When
the
output
from
pin
of
the
microcomputer
is
at
“high’’
level,
Q11
(or
012)
turns
on
to
cut
off
the
signal
which
is
applied
to
the
side
A
(or
side
B)
cartridge.
This
muting
occurs
unless
the
set
is
playing.
INDICATOR
DRIVE
CIRCUIT
This
circuit
is
made
up
of
inverter
IC503.
When
any
of
the
side
A/side
B
selector,
dual
play
and
repeat
keys
is
pushed,
the
output
from
the
microcomputer
becomes
“high
level
to
be
applied
to
the
inverter
1C503.
Here
it
is
inverted
to
be
“low”
level
signal
to
light
up
the
indicator
corresponding
to
one
of
these
buttons
which
has
been
pushed.
PHOTO
SENSOR
LEVEL
CONVERTER
CIRCUIT
This
circuit
is
made
up
of
532,
0533
and
Q534,
and
the
signal
from
each
sensor
is
here
so
processed
that
it is
shaped
in
waveform
and
changed
in
level
to
be
applied
to
the
micro-
computer.
1.
Tonearm
position
detection
When
an
EP
or
LP
record
is
at
the
lead-in
position
or
return
position,
LED505
and
gear
drum
work
together
to
detect
this,
and
the
resultant
signal
is
applied
to
0532
to
turn
it
on,
so
that
there
is
a
pulse
which
is
at
“high”
level
(at
5
V)
to
arrive
at
pin
of
the
microcomputer.
2,
Record
detection
@
fan
EP
record
is
loaded,
the
sensor
stops
light
emission
to
0538,
and
so
0533
turns
off.
With
0533
turned
off,
the
input
signals
to
pin
and
pin
28
of
the
microcomputer
are
at
“low”
level
and
“high”
level!
respectively,
so
that
the
microcomputer
can
tell
that
an
EP
record
has
been
loaded
—
see
Table
10-1.
@
If
anLP
record
is
loaded,
the
sensor
stops
light
emission
to
0538
and
0539,
and
so
0533
and
0534
turn
off.
With
0533
and
0534
turned
off,
the
input
signals
to
pin
and
pin
@8
of
the
microcomputer
are
both
at
“Tow"'
level,
so
that
the
microcomputer
can
tel!
that
an
LP
record
has
been
loaded
—
see
Table
10-1.
—-13—
Qs35 2scisser
83? 25C2320F
Sa |
a SB Sos reste
"csi TeaDll
EPP RECORD
SupL_a (2RTOGE
CARTRIDGE FORWARD
cau
From pn @) ot Feam plo@ot
microcomputer _mistocerapte
CNPBOR CNSSOG ty
~ e 2
Sib
B
CANTIOGe
SIDE
A
CARTRIDGE
ae
Crom CONTROL PwE DT
ena,
Figure 13-2
GHD +12
MICROCOMPUTER
SIDE A PLAY (spIcaTor
a CRPSIN CNSSI
TONEARM POSITION SENSOR
sore
FMPSOB CNSSOM ibd
| [PWR AS)
EP/LP RECORD SENSOR
PHOTO SENSOR LEVEL CONVERTER CIRCUIT
Figure 13-3
®
When
no
record
is
loaded,
the
sensor
sends
its
light
to
Q538
and
Q539,
and
so
0533
and
0534
turn
on.
With
0533_and
0534
turned
on,
the
input
signals
to
pin
and
of
the
microcomputer
are
both
at
“high”
level,
so
that
the
microcomputer
can
tell
that
no
record
has
been
loaded
—
see
Table
10-1.

PHONO MOTOR CONTROL CIRCUIT
This circuit consists of Q511 to Q5%8 and controls a proper
rotation of the phono motor.
1. Speed {33/45 r.p.m.) selection
When the speed is set at 33 r.p.m., the output from pin @
of the microcomputer becomes “high” level to turn on
0511, thus the phono motor revolving at the speed of 33
r.p.m. When the speed is set at 45 r.p.m., the output from
pin @ of the microcomputer becomes “low” level to turn
off 0511, thus the phono motor revolving at the speed of
45 r.p.m.
The speed is adjustable with VR501 (for 33 r.p.m.) and
VR502 {for 45 r.p.m.}.
2. Normai/reverse rotation selection
@ Normal rotation:
When the side A is playing, the output from pin © of the
microcomputer is at “low” level to turn off @578 and turn
on Q516 and 0514. Then pin @ and pin (i) of the phono
motor are positive and negative respectively, so that the
phono motor revolves in normal direction.
ios ozl«
LOW SPEED MIS-LOADING|
ou
GOR CLOSE]
00| ax
DOOR OPEN
PHONO MOTOR CONTROL
CIRCUIT
CNS302
Dio 2.
MUTING M502
on
B TONEARM SOL.
® Reverse rotation:
When the side B is playing, the output from pin © of the
microcomputer is at “low” level to turn off @512 and turn
on 0513 and 515. Then pin @ and pin G) of the phono
motor is negative and positive respectively, so that the
phono motor revolves in reverse direction.
3. Speed control
There may be a variation of the motor rotational speed, and
this causes voltage at the base of Q517 to change in
accordance with such amount of the variation. Thus this
Q517 {of Darlington connection type) controls a proper
voltage to apply it to the phono motor, with its speed being
kept steady.
If, for instance, the motor speed is higher than specified,
voltage at the base of Q517 decreases while its collector
voltage increases, resulting in that voltage to be applied to
the phono motor decreases so that the motor speed grows
down to the specified one.
+12v PHONO MOTOA NOAMAL/REVERSE ROTATION
SELECTCR CIACUIT
From pin (4) ot
microcompiler
From pin @) of
microcamputor
From pin @) of
microcomputer
oa
th cnos R610
47/S0V]+
Ree ov
2 sy
Lely)
Qsit
a,
jov
De
ATONESRM SOL
on
REY STROBE
Dia
KEY STROBE
Supply power
to pheno motor
Q517
1cSor =RH-IXIZOSAFZZ
MICROCOMPUTER
Figure 14-1
Voltage at) 7
SPEED CONTROL CIRCUIT
Figure 14-2
+ level
collector
of
———~-
—~
=~
————
At
specified
speed
Sei ee At higher speed
} — level
At lower speed
Figure 14-3
ADJUSTMENT OF TAPE MECHANISM
PINCH ROLLER PRESSURE CHECK
1. Place the unit in PLAY mode.
2. Push the pinch roller, at the point shown in Fig. 14-4, by
using a tension gauge (500 gr.) so that it will come off the
capstan. Then, slowly release the tension until the pinch
roller hits the capstan again (i.e., the pinch roller is about to
rotate again}. Check, then, the tension gauge is reading
295 gr. to 365 gr.
3. If the reading is outside the range of 295 gr. to 365 gr.
replace the pressure spring of the pinch roller.
Capstan
Tension Gauge
Pinch Roller
Pinch Roller
Pressure Spring
Figure 14-4
—14~-

TORQUE
CHECK
AT
PLAY,
FAST
FORWARD
AND
REWIND MODES
Put
a
torque
meter
cassette
in
the
cassette
compartment
of
the
set,
and
see
that
the
measured
torque
in
each
mode
is
normal
as follows:
Table 15-1
Mode
Torque
meter
cassette
|
Measured
torque
Playback
TW-2111
35
~65
gram-cm
Fast-
evruiard
TW-2231
90
~
135
gram-cm
Rewind
TW-2231
|
90
~135
gram-cm
GAP
CHECK
OF
PINCH
ROLLER
LEVER
Place
the
set
in
play
mode,
and
see
that
the
pinch
roller
lever
moves
to
create
the
gaps
@,
and
©as
shown
in
Fig.
15-2.
RECORD/PLAYBACK
HEAD
AZIMUTH
ADJUSTMENT
As
shown
in
Fig.
15-3,
make
connection
of
instruments,
and
adjust
the
head
azimuth
adjusting
screw
so
that
VTVM
reading
is
maximal,
with
no
phase
difference
between
channels.
VTVM
AUX $0301
Pin @ : L-ch
@ :R-ch
Playback
mode
Test tape
MTT-114
10kHz
250pWb/m
—10dB
Figure 15-3
TAPE
SPEED
ADJUSTMENT
As
shown
in
Fig.
15-4,
make
connection
of
instruments,
put
a
screwdriver
(for
high-frequency
use}
into
the
hole
of
the
motor,
and
adjust
the
variable
resistor
so
that
the
output
frequency
is
2970
to
3000
Hz
on
frequency
counter.
v4, Playback Speaker
socket
(S0401)
Test tape
, MTT-111
Q (3kHz)
Figure 15-4
Play Release Lever
Pinch Roller Lever
Figure 15-2
Frequency
counter
-
2
~~
Screwdriver
. for high-freq.
use
Motor
ADJUSTMENT
OF
PLAYER
MECHANISM
POSITIONAL
ADJUSTMENT
OF
PLAY
DOOR
OPEN/
CLOSE
GEAR
(DOOR
ARM
OPERATING
LEVER)
AND PLAYER DOOR ARM
1.
Keeping
the
player
door
open,
bring
the
player
door
arm
close
to
the
player
door
open/close
gear,
then
temporarily
fit
this
gear
to
the
shaft
with
screw.
Then
see
that
there
is
no
thrust
clearance
at
both
sides.
2.
Bring
the
player
door
fully
toward
arrow
@
direction,
and
secure
the
screw
firmly.
*In
the
case
of
replacing
the
door
arm
operating
lever
assembly:
After
the
procedure
of
2
above,
close
the
door
and
lock
it
—
by
pushing
up
the
right
door
lock
lever,
or
pushing
down
the
left
door
lock
lever.
Then
fix
the
door
arm
operating
lever
with
two
screws,
and
secure
them
together
with
adhesives
(instant-dry
type}.
—15—
3.
Opening
and
closing
the
player
door,
see
that
the
player
door
open/close
detector
switch
is
normal
to
detect
the
open/close
operation.
If
not,
see
“POSITIONAL
ADJUST-
MENT
OF
PLAYER
DOOR
CLOSE
DETECTOR
SWITCH”
and
“POSITIONAL
ADJUSTMENT
OF
PLAYER
DOOR
OPEN
DETECTOR
SWITCH”.
Player door
Door open/
close gear R K 7
Teo
ne
<<
Screw
Es
NS
went
A
ON Reet
Door arm
Figure 15-5
Lock lever Door

POSITIONAL ADJUSTMENT OF PLAYER DOOR CLOSE
DETECTOR SWITCH
1. Close the player door, and bring the cushion rubber, at the
door left-side arm, to the switch bracket.
2. Turn the player door close detector switch in arrow ®
direction shown in Fig. 16-1, and stop it at where it is
about to switch on.
POSITIONAL ADJUSTMENT OF PLAYER DOOR OPEN
DETECTOR SWITCH
1. Fully open the player door by using the player door open
lever.
2. Turn the player door open detector switch in arrow
direction shown in Fig. 16-1, and stop it at where it is
about to switch on.
POSITIONAL ADJUSTMENT OF REST POSITION
DETECTOR SWITCH
1, Push the gear block’s center gear in arrow @) direction
shown in Fig. 16-2, and turn the drum so that its point @)
shown in Fig. 16-2 is in the position shown in Fig. 16-3.
2. Stop the gear block's center gear to put the drum out of
rotation.
3. Turn the rest position detector switch in arrow ©) direction
shown in Fig. 16-2, and stop it at where it switches on
touching the drum projection.
4. Returning the tonearm to the rest position with the power
switch turned on, see that there is a clearance of 1 mm
between the cartridge and the cabinet (chassis) surface.
POSITIONAL ADJUSTMENT OF SIDE A/SIDE B
TONEARM SOLENOID
1. Loosen the screws at the tonearm solenoid, and put it in
attraction,
2. Secure the screws so that there is a clearance of 1 to
1.5mm at the port @® shown in Fig. 16-3, between the
tonearm guide and arm guide operating level: then, the arm
must be at down position as shown in Fig. 16-3.
3. Putting the solenoid in attraction with the power switch
turned on, see that up/down motion of the arm is normal.
POSITIONAL ADJUSTMENT OF GEAR SOLENOID
1. Loosen the screws at the gear solenoid, and put it in
attraction.
2. Secure the screws so that the center gear and small gear are
fully engaged together (if not so, turn the warm gear}, with
the center gear going down to the full extent.
3. Putting the solenoid in attraction with the power switch
turned on, see that the center gear is fully engaged with the
drum and player door open/close gear.
POSITIONAL ADJUSTMENT OF TONEARM LEAD-iIN
POSITION
1. Load an LP record in the set, with the power switch turned
on.
2. Push the tonearm cue key.
3. Push the player door open/close key, then see that the
player door is closed and the tonearm is moving from the
rest position to the LP lead-in position.
4. Loosen the screws at the side A or side B tonearm clamper
to allow motion of the tonearm.
5. Secure the screws so that the cartridge stylus tip is at the
central part of the iead-in position.
6. Again push the tonearm cue key to lower the cartridge,
then see that the stylus tip is moving down to the central
part of the lead-in position. If not, push the play/cut key to
cause the tonearm to return to the rest position, then
repeat steps 2 to 6 above.
Door close
datector switch
Door feft-sida arm
Cushion rubber
Switch bracket
Rest position
datactor switch
Side A arm salanoid
Figure 16-3
Scraws
Figure 16-4
Sida A clampor
Cartridge
Read-in
Position
Figure 16-5
7. Take the same adjustment while loading an EP record in the
set.
~16—

ROTATIONAL
ADJUSTMENT
OF
PHONO
MOTOR
1.
Prepare
an
LP
record
which
is
provided
with
a
strobo
viewer,
and
load
it
in
the
set.
Then
put
the
set
in
cue
up
mode
—
by
pushing
the
tonearm
cue
key
first
and
then
the
player
door
open/close
key.
2.
Adjust
variable
resistor
VR501
or
VR502
so
that
the
strobo
viewer
appears
to
be
still.
@
VR501:
at
33
r.p.m.
speed
@
VR502:
at
45
r.p.m.
speed
(set
by
the
speed
selector
key)
ADJUSTMENT
AND
CHECK
OF
RECORD/PLAYBACK
AMPLIFIER
CIRCUIT
BIAS CURRENT ADJUSTMENT
@
Make
connection
of
instruments
as
shown
in
Fig.
17-2,
and
adjust
variable
resistor
VR205
or
VR206
so
that
bias
current
available
with
the
tape
selector
switch
set
at
each
position
is
shown
in
Table
17-1.
Table 17-1
Tape
selector
Voltage
;
switch
(Bias
current}
Adjustment
VR205 (L-ch)
Normal 36mV (360UA) | yR206 (R-ch)
47 ~53mV
(470 ~530uA)
66 ~74mV
(660 ~740pA)
Checking
ERASE CURRENT CHECK
®
Make
connection
of
instruments
as
shown
in
Fig.
17-3,
and
check
if
the
erase
current
is
as
shown
in
Table
17-2.
(Tabie 17-2)
Tape selector switch
Metal
Voltage (erase current)
120 ~160mV (120 ~ 160mA)
PLAYBACK
SENSITIVITY
ADJUSTMENT
@
Make
connection
of
instruments
as
shown
in
Fig.
17-4,
and
adjust
variable
resistor
VR201
or
VR202
so
that
the
playback
sensitivity
is
as
shown
in
Table
17-
3.
Adjustment
VR201 (L-ch)
VR202 (R-ch)
Table 17-3
Switch Voltage
Tape selector switch at “normal”
Dolby NR switch at “on”
RECORD/PLAYBACK
SENSITIVITY
ADJUSTMENT
®
Make
connection
of
instruments
as
shown
in
Fig.
17-5,
adjust
variable
resistor
VR305,
VR306,
VR203
or
VR204
so
that
the
record/playback
sensitivity
is
as
shown
in
Table
17-4.
Table 17-4
Switch Voltage
oe ee
Record level
Tape selector switch controls
at “norma!” VR305 (L-ch),
VR306 (R-ch)
VR203 (L-ch),
Adjustment
Record
Dolby NR switch at
Play- “oft”
back
VR204
(R-ch)
=—17—
yReos
tLeent ]
yRz04——-TP20
vrzoe
IR-ch? 0), YR 201
Te2os_ Tr202
vazo4
tL-cht |= (Reh)
Te2z05
Bivens
VRSOI
oO
Microcomputer PWB-B1
Figure 17-1 Adjustment points
REC/PB head
Tape Deck PWB-DS
TP203 {L-ch}
Record
moda
TP202
{R-ch}
R201 (R-ch)
R202 (L-ch}
TP201 (GND)
Figure 17-2
Erase head
Record mode
TP201 (GND)
Figure 17-3
VTVM
Playback
REC/PB made TP205 (L-ch}
TP206 (R-ch}
Test tape
MTT-150
400Hz )
200pWb/m
TP201 {GND}
Figure 17-4
AUX
$0301
Pin g i L-ch
CR oscil- G > Rch
lator
Record
moda
Attenuator
Frequency i
kHz
Figure 17-5

ADJUSTMENT OF TUNER CIRCUIT
AM IF/RF ADJUSTMENT
SIGNAL GENERATOR DIAL
rest |___SIGNALGENERATOR | DIAL | meter | ao suerment
P
Refer to 455kHz Highest Refer ta IF Turn the core of T104 until IF
Figure 18-1. [V2-3000H] | frequency Figure 18-1. Transformer waveform is maximal as shown
(Reduce the in- 465kHz 7104 in Fig. 18-2.
1 put as low as [V2Z-3000E] Repeat this twice or three times
possible.) {400Hz, 30%, to obtain best result.
AM modulated)
Refer to 145kHz Lowest Refer to Oscillation coil Adjust for maximal output.
Figure 18-3. (400Hz, 30%, frequency Figure 18-3, L109
2 {Reduce the in- AM modulated)
put as low as
LW possible.)
Band
coverage Same as step 2. 295kHz Highest Same as step 2. Oscillation Same as step 2.
3 (400Hz, 30%, frequency trimmer
AM modulated) TC106A
Same as step 2. 160kHz Tune ta Same as step 2. Antenna coil Same as step 2,
4 {400Hz, 30%, 160kHz. L107A
Lw AM modulated)
Tracking Same as step 2. 260kHz Tune to Same as step 2. Antenna Same as step 2.
5 (400Hz, 30%, 260k Hz. trimmer
AM modulated) TC104A.
Same as step 2, 515kHz Lowest Same as step 2. Oscillation coil Sarne as step 2.
6 (400Hz, 30%, frequency Lit0
l Mw AM modulated)
Band
coverage Same as step 2. 1650kHz Highest Same as step 2. Oscillation Same as step 2.
7 (400Hz, 30%, frequency trimmer
AM modulated} FC106B
Same as step 2. 6COkHz Tune to Same as step 2. Antenna coil Same as step 2,
8 (400Hz, 30%, 60CkHz L107B
mw AM modulated}
Tracking Same as step 2. 1400kHz Tune to Same as step 2. Antenna Same as step 2.
(400Hz, 30%, 1400kHz trimmer
AM modulated) TC104B.
Repeat steps 2 ~9 until no further improvement can be made, and try step 1 once more.
VTVM
AM sweep Oscilloscope AM Signal generator
generator
Oo
Loop antenna
TP108
(GND)
(GND)
Figure
18-1
AM
IF
Adjustment
Fein
18-3
AM
RF
Adjustment
Cw
|
MW/LWanp
Tast point
L104 |
- villinwenlonee=
o LIO7 A
Q
TPIo3 TPIOI Ova 1
aE 8 a
455kHz <VZ-3000H>
465kHz <VZ-3000E>
TClos i
qPI04
Figure 18-2 AM IF Curve
Figure 18-4 Adjustment points
—-18—

THE
INSTRUCTION
OF
FREQUENCY
ADJUSTMENT
(VZ-3000H Only)
In
order
to
comply
with
FTZ
rule:
Nr.
358/1970,
please
fix
coils
(L103)
and
oscillation
trimmer
(TC102),
respectively,
as
the
low
end
of
dial
frequency
(87.6MHz)
and
the
high
end
of
dial
frequency
(108MHz)
on
FM
band,
by
adjusting
oscillation
FM IF/RF ADJUSTMENT
©
Set
the
function
selector
switch
at
FM
MONO
position.
iNustrated in Figure 18-4.
[
SIGNAL
GENERATOR
DIAL
sae
Elle
POINTER
|
conmeetion
|
ADJUSTMENT
REMARKS
CONNECTION
FREQUENCY
SETTING
Refer
to
10.7MHz
Highest
Refer
to
IF
Turn
the
core
of
T1017
until
Figure
19-2.
(400Hz,
40kHz
frequency
Figure
19-2.
Transformer
waveform
is
symmetrical
in
1
IF
ev.,
{Test
point
T101
right
and
teft
as
shown
FM
modulated)
TP104}
Fig.
19-1.
Same
as
step
1.
|
Sameasstep
1.
|
Same
as
step
1.
Same as step 1. | Detector
Turn the cores of T102 and
FM modualted}
Same as step 4, | RF coil L102,
Antenna coil
L101
(Test point 7102, T103 T7103 until waveform is sym-
Detection
TP104}
metrical
in
the
upper
and
lower
with best linearity (‘S" curve),
as shown in Fig, 19-3.
Repeat
steps
1
and
2
until
no
further
improvement
can
be
made,
Refer
to
87.3MHz
Lowest
Refer
to
Oscillation
coil
Adjust
for
maximal
output.
Figure
19-4,
(400Hz,
40kHz
frequency
Figure
19-4.
L103
(Reduce the dev.,
input as low FM modulated)
Band as possible.)
coverage
Same
as
step
«|
109MHz
Highest
Same
as
step
4,
|
Oscillation
Same
as
step
4.
(400Hz,
40kHz
frequency
trimmer
TC102
dev.,
Same as step 4.
Same
as
step
4.
|
930MHz
Tune
to
oe
40kHz
90MHz.
EM
modulated)
Tracking
Same
as
step
4.
|
106MHz
Tune
to
ee
40kHz
106MHz.
FM
modulated)
Same
as
step
4,
|
RF
trimmer
TC1018.
Antenna
trim-
mer
TC101A.
Same as step 4.
Repeat
step
4,
5,
6
and
7
until
no
further
improvement
can
be
made.
the test points TP103 and TP102.
Upon
completion
of
the
tracking,
give
no
signal
to
the
input
then
adjust
the
core
of
T102
so
that
there
is
no
voltage
caused
between
40. 7MHz
Figure 19-1 FM iF Curve
10.7MHz
Sweep
Oscilloscope
generator
TP101 or
TP 104
Figure 19-2 FM tF Adjustment
_i9-
Figure 19-3 FM S Curve
FM signal generator FM Antenna socket
VTVM
TP 108
(GND
Figure 19-4 FM RF Adjustment
ADJUSTMENT OF VCO FREQUENCY
AND MUTING LEVEL
VCO
Frequency
Muting
1.
Make
connection
of
instruments
as
shown
in
Fig.
20-1.
6.
Connect
FM
signal
generator
to
FM
antenna
terminal
of
the
2.
Set
the
function
selector
switch
at
“FM
MONO”
position.
set
across
FM
stereo
modulator
which
is
set
at
modulation
3.
Set
FM
signal
generator
to
produce
a
signal
of
98
MHz,
100%,
modulation
frequency
1
kHz.
Set
the
output
of
FM
60
dB,
400
Hz,
100%
modulated,
and
let
the
set
tune
this
signal
generator
to
be
25
dB
at
the
antenna
open
terminal,
signal.
and
adjust
semi-variable
resistor
VR101
until
the
muting
is
4.
Set
the
function
selector
switch
at
“FM
STEREO”
posi-
cancelled.
tion.
. Shorting test point TP102 and ground, adjust variable
resistor VR102 so that frequency counter reads 76 kHz
+76 Hz.
After VCO frequency adjustment, remove the shorting
between TP102 and ground.
600--
VTVM
Modulation
frequency 1kHz
L+R 45%
LR
45%
3.3
ohm
cos
Pilot 10% i
:
FM
signal
generator
ey
Antenna
om
AUX
50301
socket Pin @ : L-ch
FM stereo
modulator
Green
Tweeter
SP2
50TB394A
Woofar
SP1
16WBS94A
Figure
20-4
EXPLODED
VIEW
Figure
20-3
—20—
Frequency counter
Figure 20-1
Specifications or wirin
dlagrams of this modal
are subject to change f
improvement without
prior notice.
SCHEMATIC DIAGRAM

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10K-8 3
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re
FM MONO f = SIGNAL
of METER
4-----~
~~~
—--
-—
—-
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|
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|
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|
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|
1
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TUNER
PWB-Dt
Ic9O1
LBI408S
[ REF. wo.] DESCRIPTION
© ~ @: te Tare o&cx
PWBE-D5
[swiola~G [FUNCTION SELECTOR|LW-MW- EM ST-FM-AUK-TAPE-PHONO
tease |
OL-tosRol_
{Specifications
or
wiring
diagrams
of
this
model
are
subject
to
change
for
improvement
without
prior
notice.)
ey
Sa,
EE
Eee
Ea
ee)
ee
Figure
21,
SCHEMATIC
DIAGRAM
(1/4)
—21—
—22-—