Mitsubishi Electric X-7 User manual

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SERVICE
MANUAL
VERTICAL
MUSIC
CENTER
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x-7
EMBLING
PROCEDURE
to remoYechassisunit
knobs (TUNING, FUNCTION,VOLUME,
TREBLE,
BALANCE,
aNd
E SELECTOR, BASS,
cassettecover,
fourscrews
e (on
bothsides)
inFig. 1.
chassis
unit rearward
to separateit from the main
. Disconnectleadwirefrom the player
unit.
3. Howto disassemble
principalparts
of mechanism
* ln the followingdescription,the mechanismassembly
hasalready
beenremoved
fromthe
chassis
unit.
3-l Disassembling
of head,
pinch roller, reel rest, and
play
idler.
1l Remove
cassette
holder.
(CS
ringl
Fig.
3
2l Remove
pirrh roller/panel
plate.
(CS
ring)
Fis.4
fl+ttt
:al
th
)ss
to
ptn
>le.
2l
'ew
Fis.1
'to removecassette
mechanism
assembly
chassis
unit.
counter
belton thecounterside.
isconnectlead wires (J410, 420) of mechanismas-
from PV board.
emove five mechanismassemblyfixing screws
-3
x
6).
of the five screwsare usedcommonlYto fix
knob.
@
the
x-7
\
Fig.2
-3-

ù'
f, ..--'--
F!t
l, !
i;i
Tracking
force . 2.0gr.
v î
I
CASSETTE
DECK
SECTION
Type . ...4-track,2+hannelstereo i
æssette
deck i
Tape
speed ïii",^ttn (1-718
iPs) I
,l
Head
material ..
i..:r
{-{ I
REC/PB Hard
PermalloV i
i
MONO . . 77dB ERASE . Ferrite
STEBEO . 72dB Wow
andflutter . . 0.06
%
Wrms
Signal
to noise
ratio (DlNl Signal
to noiseratio
MONO
.:.''..'....::. 70dB (WeightedMetaltapel
STEREO...:. .65d8 DolbyNRout.......56dB
Stereoseparation ..3sdBatlkHz ''" DolbyNRin...."" 66dB
Frequency
responss t 1dB,30 Hz- 15kHz ' Crosstalk
MWsection i Between
channell " " ' 35 d8
Tuningrange. ....525kH2-l,605kHz I Batrreentracks "65dB
Usable
sensitivity
(lHFl . . . 300pVlm Totalharmonic
distortion . 1.0
%
sensitivity ls/N = 26 dBl . . 600pVlm Frequency
resPonso
Totalharmonic
distortion 1.0
%
lmageresponseratio.....3OdB Special .30H2-16,000H2
LWsestion ' ' Metal ' 30 Hz - 17'000 Hz
Tuninglange. ;... 150kHz-350kHz
Sensitivity
(S/N
= 26dB) . . 1mV/m GENERAL
tmaç resionse
râtio :..'. . . 35dB Power
consumption 110W
(lEC
nominal) 2-
Dimensions(WxHxD)
.- 415
x476xt8ntT-.^.^,,.' l)
AMPLIF|
ER
sEcrloN 116'g/8x18-314x7-71616"1
::
,^^ ô ll-l Zt
Poweroutpùt 2owattsSohmsJ
kHz,, -' Weight ..... .... 13.5kS(29'8lbs) , 1l
- - -, ; - -L --^i Ert ^^vial rt
Totalharmonic distortion . O.O4
%
at 1kHzathalfpower Black
sheets
17'30cm (For
.lnp.ut-sensitivity/impedanb - transparent
or coloured
. rvri'c
..... .... 1.5mV/10Kohms
' '..- records)
AUX . . . 150
mV/25K
ohms " AM loop
aerial
, Variablelôudness
êontrol : 'r : ' '
(VR MAX -30 dB) o ,,Dolby" anddoubte-D
rymbol are
trademarks
of Dolbl
LOW . . . O
-+7 dB at 100
Hz Laboratories Licensing
Corporation. '
HIGH . . . +7 d}at l0 kHz Noise Reduction System manufactured
under licensc
from Dolby Laboratories
Licensing
Corporation'
TURNTABLESECTION
Type . .... Vertical
lineartracking
Drivesystem
' -*-.- Îùlotor DCservo
motor i. ,r
,.,.
Platter . . . . 30 cm 112"1
diameter, ài '. 1'
Aluminium diecast
alloY li,;..;:i
, .'-':,i

MBLING
PROCEDURE
to remove
chassis
unit
knobs (TUNING, FUNCTION, VOLUME,
SELECTOR,
BASS,TREBLE,
BALANCE,
ANd
cassette
cover.
four scranvs
e (onbothsides)
in Fig.1.
chassisunit rearward
to separate it from the main
.Disconnect
lead
wire
fromthe
player
unit.
Fis.1
'to remoyecassette
mechanism
assembly
chassis
unit.
counter
belton thecounter
side.
lead wires (J41
0, 420) of mechanism
as'
from PV board.
five mechanismassembly fixing screws
@
-3
x6).
of the five screws
are usedcommonly to fix the
knob.
3. Howto disassemble
principalparts
of mechanism
' In the following description,
the mechanismassembly ly
hasalready
been
removed
fromthe
chassis
unit.
3-1 Disassembling
of head,pirrchroller, reel rest, and
play
idler.
1) Remove
cassette
holder.
(CS
ring) :al
th
)ss
to
cs
Fig.
3
2) Remove
pinch
roller/panel
plate.
(CS
ringl
Fis.4
ptn
rle.
2l
'ew
Fis.
2

SPECIFICATIONS
TUNER
SECTION
FMsection
Tuning
range
.
Usable
sensitiviry
(lHF) . . .
50dBquieting
sensitivitY
AUX
Variable
lôudness
éontrol
(VR
MAX -30 dB}
LOW .
HIGH.
TURNTABLE
SECTION
Tvæ .
Drive
rystem
-'"'- lttotor
Platter
87.5
MHz
- 108MHz
2.5
pV fi3.2
dBf)
Plr*", speed .
Wow
and
flutter
Signal
to noise ratio
Tonearm
Type .
Cartridge
Trackingforce .
Tape
speed
Head
material
REC/PB
33-l/3,45
rpm
0.08
%Wrms
ss
dB
(l;c'81,65
dB
(DlN'B)
Liner
tracking,
strarght'
static
balance*
Duat
maginet
tYPe
2.O
gr.
"
1.
1)F
T
2l
3) R
M.NO . . 5.5pV (20
dBf)
STEREO 55pV {40dBf)
Sensitivity
{t40 kHzdeviation}
MoNO
(S/N
=
26
dBl . . 1.8pV
STEREO
(S/N
=46dB) . 35
pV
TotalHarmonic
distortion
MONO
STEREO
lmage
resPonse
ratio
Signal
to noise
ratio
(lHFl
MONO
STEREO
Signal
to noise
ratio
(DlNl
MONO..:........:.
STEREO.....
Stereo
separation. .
Frequency
response
MW
seaion
Tuning
range.
Usable
sensitivity
(tHF) . . .
Sensitivity
(S/N
= 26 dB) . .
Totalharmonicdistortion
lmage
responseratio
LWsestion
Tuning
range
.
Sensitivity
(S/N
= 26dB) . .
lmage
response
ratio ;.. . . .
Totalharmonic
distortion
.
I
np.ut-sensitivity/i
mpedanbe
Mtc
..
CASSETTEDECK
SECTION
TYPe. ..4-track,2'channelstereo
cassefie
deck
0.5
%
0.8
%
.45
dR
77
dB
72
dB
70
dB
65dB
35dBat
1
kHz
tldB,3OHz-15kHz
525kHz
- 1,605
kHz
300gVlm
600
pVlm
1.O%
30dB
1
50
kHz
- 350
kHz
1mV/m
35dB
ERASE Ferrite :
Wow
and
flutter . . 0.06
%
Wrms
Signal
to noise
ratio
(Weighted
Metaltape)
Dolby
NR
out . .
DolbyNRin . . .
Crosstalk
Betweenchannels
Betweentracks,
Totalharmonic
distortion
Frequency
response
Normal
Special
Metal .
GENERAL
Power
consumPtion
Dimensions(WxHxD)
Weight
Accessories
4J5 cmlsec
(1-7l8
iPs)
Hard
PermalloY
56
dB
66
dB
35
dB
65
dB
1.O%
30
Hz
- 15,000
Hz
30Hz
- 16,000
Hz
30
Hz
- 17,000
Hz
110W
(lEC
nominal)
415
x 476
x 189
mm
(16-3/8
x 18'3/4
x 7-7!616"1
13.5
kg
(29.8
lbs)
T-shaped
FM
aerial
Black
sheets
17,
30
cm(For
transparent
orcoloured
recordsl
AM looP
aerial
AMPLIFIER
SECTION
Power
output 20watts
I ohmsJ kHz,
2.
1l
2l
3)
4l
5%THD
0.04%
at 1kHzathalfpower
1.5mV/10K
ohms
150mV/25K
ohms.
O-+7dBat100Hz
+7
dB
at10
kHz
Verticallinear
tracking
Beltdrive
DCservo motor
30
cm (12"1
diameter,
Aluminium
diecast
alloY
o "Dolby" and
double-Dsymbol
are
trademarks
of Dolby
Laboratories
LicensingCorporation.
Noise Reduction System manufactured
under licenie
from Dolby Laboratories
Licensing
Corporation'
;: :-.:t -.:.

/'
'Remove
assist
gear.(E-ring
3, 1
pcl
) Removefriction pulley.
Remove
wormgear.
(E-ring
2, 1 pcl
'Remove
AUTO.
STOP
cam.
Howto lemoYedustcover
1)Pull twohinge shafs.
2) Removetwoscrevvs from
cap
mounting
holder.
) Remove
hinç mounting
screw
fromdust
cover.
) ln this
state,
replacedust
cover.
Fig.11
Howto remoYe
tulntable
lF Hold turn table on its circumference
by hand and
turn 45adaptor
in centre
inclockwise
direction.
2) Turntableholder,45 adaptor.
and spring
areremoved.
I Remove
backtid of the unit (by removing
four fixing
screu6,T2-3 x 12) and hold tr.rrntable
and flyralheel
by hand. Then turn turntable counterclockwise
to
remove
it from shafe
6. Howto remove
player
unit
1) Removefour coverfixing screws
(Tl-3 x l0) below
turntable.
2l Hold tone arm basewith finger and move it towards
centre
shaft,
and
stopabove
where
cover
wad.
Fis.
12
3) Remove five player-unit fixing screws (A and B) in
Fig. 13. Player unit can now be removedfrom cabinet
main body.
ody
ntal
vith
ress
rntO
ptn
ble.
.21
rew
Fis.i'
'.)
Asslsl Geor
!
o
o
-5-

3) Remove reel
rest
(FEED,
TAKE-UP),
(PS
washer)
PS Wosh€r
f--;'i'i
ew
6x5
Fig.
7
3-3 Disæsembling
of motor, assist
gear,
friction pulley,
andauto.stopmechanism
1) Remove
parts
as
described
in above
ltem3'2.
2) RemoveholderL. (Twoscrews
M3x 5)
3) Removemotor. (Twoscrews
M3x 5, M2.6
x 5)
Fis.8
Remove
START
lever.
(E-ring30,
1
pcl
oo
@
Fis.5
4) Removeholder
(head
holder).
(One
screw
M'2.6x 10)
5) Removeidler
springon theidlerside.
6) Remove
spring
(fordriving
headbasel.
7) Remove
headbase.
8) Removeidler
(PLAYlDLERI.
Note1. Take carenot to lose
the one steel
ball between
holder andheadbase
andthe three
steel
balls
be'
tweenheadbaseandchassis
base.
for HgodBos. Drlve
Fig.6
3-2 Disassemblingof flywheel and belt (MAIN, REEL,
AUTO.STOP)
1)Bemove the RECORD/PLAYBACK lever.
(Onescrew
M2.6
x 5)
2) Remove
REEL
beltandMAIN
belt
3| Removeflywfieel. Remove AUTO. STOP belt at ûre
same
time,
t' ''*
4l
rîe G
rl-l
ù .c, :f,,
j' tr
b-*i+ilr
Levgr
-4-
Fig.9

S
crews
Fis.
19
10. Howto replace
powerlC
1) Remove
chassis
unit according to theprocedure
in ltem
1.
2) Remove
tuner
unitaccording to the
procedure
in ltem9.
3) Bemove
three screws
(1)(T1-3x 121,two screws
(2)
(T2-3 x 8), andsix screws
(3)(T2-3
x 10) in the rear
panel.
4l Disconnect
leadwireof transformer
fromPCboard.
5l In thisstate.
remove
rear
panel.
6) Remove
screw
fixing
power
lCtoradiation
panel.
7) Remove two shield
plate
fixingscrews
on bothsides in
therearof chassis
unit.
8) Removesoldering
of power lC
andtake
out.
s",c'"Q-'@.
Fis.
20
ADJUSTMENT
PROCEDURE
TURNTABLE Section
o Before adiustment. removethe back lid from main bod'
and place the playerhorizontally.
1.STYLUS HEIGHT ADJUSTMENT
1) Remove the main turntable belt and the horizonta
motor belt. With no record, lift the tone arm basewitl
the finger and move it to the centre of turntable. Pres
the actuator of REST switch to put the switch intr
theON state.
(See
Fig.1)
C:m prn E
Fis.
1
2l With the tone arm up, unlock and turn the cam
E till the tip of stylusis8 t 1mmabovetheturnt
ln this case,
the mainbodycover
is
open.
(See
Fig.
3) After adjustment,lock the eccentric
pin E with
andreplace
the
beltremoved
previously.
L
\
RUBSÊR
SEATSURFACE
Fis.
2

7. Howto temovetone arm
1) Remove
player
unit accordingto theprocedure in ltem
6.
2) Remove
slit
plate
attached
to armbasein Fig.14.
Arm Bose
Fis.14
3) Removedial thread
from pulley and remove
fixing
screna
(C)
in Fig. 15.
4) Remove
pulleyattached
to arm basein Fig.
D. (E-ring
2.4ôx 2l
Fig.
15
5) Removescrew
in Fig.16 and removelifter guide
from
tone
arm,
6) Remove
tonearm fixing nut in Fig.
l7and disassemble
tone
armfromtonebase,
7) Disconnect
outputlead
wireof tone
armfrom PCboard.
8) Inthis
state,
replacetone
arm.
9) After replacing
tone arm, besure
to carryout adjust'
menL
Fig.17
8. How
to remove
main
motor
1) Remove back
lidof the
unit.
2) Removemain
belt
frommotor
pulley.
3) Removeone motor holdermountingscrew
(M3x 25).
4) Putl motor holderin a directionshownby arrow in
Fis.
18.
5) Disconnectconnector
J9
fromlogicboard.
6) Inthis
state,replace
motor.
7) Reverse
the aboveprocedure
to mount motor holder.
Robbar Cushion
Fis.18
9 Howto removetunerunit
* Tunerunit can be
replaced
without removing
thechassis
unit.
1)
PulloutTUNlNGknob.
2) Remove
four tuner unit fixing screw
(1)(T2-3 x 10)
from chassis
unit rear
panel
in Fig.
3) Pull tuner unit toward yourself and disconnect
con-
nector J212trom thetunerboard.
Thetunerunitcan be
disassembled.
tP
Slii Ploie Fixing Screw
g
Fig.16

Adjustment
of Recording
System
Connect a frequencY counter 1o
Pin
1 (L) or Pin
3 (R) and Pin
2
(GND) of the
jack
J120'
OSC
unit.
Ad
just OSC unit till the lre-
quency counter reads 85 KHz
r 0.1
KHz.
Note: Adiust
with BEAT
CANCEL
switch
in"N" position'
2. Adiustment
of recording
current
1)Setting . . ' ' Withthedeck
in recording
mode'
aPPIY
a signal
of 40OHz,
-10
dB'
Adiust the RECORD LEVEL
control to obtaina -7 dB signal
( I atthe
output
terminal,
then
lower
the
input
level
bY
30
dB.
2)Test
tape
. . AC512
special'
3l Location . . . Semi'fixed
resistor'
VR541
(L)'
vR641
(L).
4) Procedure Adjust,
so that the output level
during
recording
and
PlaYback
of
400Hz signal
becomes
equal
to
that
during
monitoring.
ADJUSTMENT
LOCATION
DIAGRAM
if
3. Adjustment
of biascullent
1)
Setting . . . Same
as
inltem
2 above'
2)Test
tape. . AC512
special.
3) Location . . Semi-fixed
resistor
VR561
(
vR661
(R).
4) Procedure Adjust,
sothat the
level
differ
between 8 KHz and 400 Hz
within 10.5 dB during
recordi
and playback of 400 Hz and
KHzsignals.
1. Bias
frequency
1)Setting
2) Location
3) Procedure
I
p
I
----

Z VERTICAL ADJUSTMENT
OFTONEARM
1)With unit in state of ltem l-(11, allow a threadwith
smallweight to hangfrom a top surface
of setalong
the
tone arm. Put a pin between
the armbase
and
tone arm
and setthe stylus pressure
of tone armat Og' (See
Figs'
3 and
4)
2) Loosen
the mainweightfixing hexagon
screw
(M3X 4)
with a 1.5
mm hexagonal
screwdriver
and adiust the
main weight till the perpendicutarly
hung thread be-
comes
parallel
to thetonearm.
After adiustment,
tighten hexagon
screw
of mainweight'
3. ADJUSTMENT
OFARM LIFTER
l) Putthe
player
intoastate
as
in
1(1)'PresstheLIFT/CUE
button to lower
thetonearm'Press
again
theLIFT/CUE
button to raisethe arm and make sure
that the arm
riseswithout tiliting to right or left' lf the arm tilts
to eitherright or left, allow thearm
to lower
and
adiust
a screw
of pulleyC (Fig.1) untill the tone arm rises
andlowers
without tiliting.
4. ARMLIFT
TIMING.
Note:This adiustment
shouldbe made
with the player
detached
from thecabinet
mainbody'
1)Put the player into a state
of 1 (1)' With the tone
arm raised,
turn the pin F to adiustthe clearance
be'
tween the pulley C and pin F (shown
in Fig' 1l to
0.5
t 0.3
mm.
5. ADJUSTING
THE LEAD-IN
POSITION
1) Remove
the back of playerwhile keeping
other com'
ponentsin theactual
operation
state'
2) Adjust the campin G (Fig.5l sothat the stylus
lowers
correctly in the lead in groovesalong the periphery
of recordla 12" disc)placed
on theturntable
when
the
START button is
pressed.Also
check
7" operation'
Fig.5
6. TRACKING
SERVO
ADJUSTMENT
1) This adiustmentshould be made
afterthe adiustment
of
1 to 3. Disconnect
connectorCON'8 (4 pin) from the
main
PCboard.
2) The removed
connector CON'8 is wired as shown in
Fig. 6. Press
pin 1 with a standard
screwdriver
and pull
out thebrownwire.
MAINWEIGH'
FIXING
SCREW
S.t oin [email protected] tôd M
I
Srylui prdst ot &h L $l lo 09h
Fis.
3
L@s ih n.in Éighr lixing s@
with . h.x4@l I 5hm scudris.
.nd .diur till lh. Frfdicula. liE.d
Fro Frallal to Sa l@ arm
0
To lamp
t234
coN-8
Fig.6
Fis.4

3l Insertthe connector
CON-8
again
into the main PC
board.
4) Connectthe (-) lead of a Mltimeter to pin 1 (main
body sidelof connector
CON-8
and connect the (+l
sideof tester
to the brown lêad
wiredisconnectedfrom
pin 1.
See
Fig.
7.
5) Put the player
into a state asin I (t). With the tone
armraised,
adjust
thecam
pin A of Fig.1
till themeter
indicatesl0tlgA.
6) Allow thetone arm
to lower
fromthestateinabove
(5),
and
makesurethat
themeterindication
is
within
t 1 gA
of thevalueobtainedwith thetonearmraised.
7) Gonnecta voltmeter
between
PIN I andGND of main
PV board and adjust the preset resistor
VR 101 till
the
voltmeterindicates
3.5V.
ADJUSTMENTLOCATION
DIAGBAM
7. SERVOMOTOR
SPEED
ADJUSTMENT
1
I Place
a test recordon the turntableandconnect
a fr
quency counter to the output terminal of player v
an
amplifier.
2) Remove
the backof playerandadjun the playerspe(
to 33rpm.
3) Play back 3 KHz of test record and adjustthe pres
resistor
VR 103
for 3020H2.
4l Setthe playerspeed
to 45 rpm. Ptay
backas
intheca
of above(3) and adjust the preset
resistor
VR 102t
the
counterindicates
4070H2.
t_
Fig
7

TAPE
DECKMECHANISM
Section
1. ADJUSTING
THETAPE
SPEED
1l Setting - Connect
a frequency
counterto the output
terminal.
2)Test
tape
- MTT-I11
(3
kHzl
3) Adjustment procedure
- Play back the test tape, and
insert
a standard
screwdriver
into the motor adjusting
hole
and
adjusttill thefrequency
counrerindicates
3000
1tB
nz.
CapstanMotor
2) Testtape
. .
3) Locationof
adjustment
4| Adjustment
procedure
Erase Head REC/PB Head
Head Azimuth Adj. Screw
2. ADJUSTING
THEHEAD
ANGLE
1l Setting . . . . Set the pLAy-BACK OUTpUT ACvoltmeter Oscilloscope Low
frequency
oscillator
LEVEL ADJUSTMENT preset
control
VR102
(L),
VR202
(Rlto
themax.
level.
MTT-215C
(10k/315H2,
-10 dB,
NORMAL)
Head
angle
adjustingscrew
Play back the test tape and ad-
just for maximum output on
bothchannels.
TAPEDECKELECTRICALSection
MEASURING
INSTRUMENTS
ANDTESTTAPES
l'. Low-frequency
oscif
lator . . . 20 Hz
- 20kïz
2. Variableresistance
attenuator 0 - 90dB,0.1
or0.5dB
step
3. AC
voltmeter
. . . . . Measuring
range
of 2O
Hz
-
200
kHzormore,input
impedancemorethan
100kçl,
and
-60 dBor more
4. Frequency
counter
5. Oscilloscope
6. Testtape
. MTT-I11 (3
kHzl
. MTT-215C
(10K/315
Hz,
-10dB,
NORMAL)
o MTT-150 (400H2
dolby
level)
. AC-512
(blankl
7. Howto connecttheinstruments,
1) Connect a loadresistance 22 kQ, thentheAC volt-
meter anti oscilloscope
to the output terminal of
deck.
2) To adjust
the recordingsystem,connectthe low-fre-
quency oscillator and resistance
attenualor to the
input
terminal
ofdeck.
ADJUSTMENT
OFPLAY.BACK SYSTEM
1. ADJUSTING THEPLAY-BACK
OUTPUT
LEVEL
1) Testtape. . MTT-150
(Dolby
levell
2) Location
fo ad-
iustment
3) Locationof
detection
4) Adjustment
procedure
Preset
controlVR 501
(Ll,
vR601
(Rt
(+) sideof electrolyticcapacitor
c 523(L),
C623
(R)
Playback the test tape and ad-
justuntilltheoutput level
on the
(+) sideof C523 and C623 be-
comes580
mV t 0.25
dB.
-10-
s

3) In the state of above2), set the modulation to 0%'
Connect
the frequency
counter
to a testpoint TP 1 of
lC2O2.
Adiust a semi-solid
resistor
VR201 so that the
frequencvcounterreads
19 KHzi 50 Hz'
3. AM Adlustment
1) Connect the output of AM-SG to a loop antenna'
Connect the loop antenna attached to the main body
to tne AM antenna terminal, take the output from
pin 12 of lC2O1, and connectit to the AC voltmeter'
2) Set
the AM-SG
frequency
to 520 KHz' Tune pointer
to
the lowest frequency. Adiust the local oscillator
trans-
former so that 520 KHz can be received
from AM-SG
3) Set the AM-SG frequency
to 1650 KHz' Tune pointer
to the highest frequency. Adjust the local oscillator
trimmer C317 so that 1650
KHz can be received
from
(
a AM'sG. - 4l Set the AM-SG frequency
to 600 KHz' Tune the setso
that 600 KHz can be received
from AM-SG' Adjust the
tuning tra'nsformer T301 so that the AC voltmeter
registers
the maximum reading.
DIAL
CORD,STRINGING
l,l
o'7
ê.
o ,Lz 5
ç
5) Set the AM SG frequency to 1400 KHz. Tune the se
so that 1400 KHz can be received
from AM-SG.
Adlus
the trimmer capacitor C302 so that the AC voltmete
registersthe maximum reading.
6) Repeatsteps2) through
5) several
times.
4. Adjustment of LW
1) Obtain
astate
as
in the ad,iustment
of MW.
2) Set AM-SG frequencyat 140
kHz. Tune set
indicatio
to the lowest frequency. Adjust the local transforme
T304 till 140
kHz can bereceived
from AM'SG. Adius
the tuning
transformer
T302 so
thatthe
max.reeading
obtained
on an
AC voltmeter.
3) Set AM-SG f
requency
to 360 kHz. Tune set
indicatio
to the highest
frequency.
Adjust the trimmer capacitc
C319 till 360 kHz is received
from AM-SG.Adjust th
trimmer capacitor C304 so that the max. reading
obtained
on an
AC voltmeter.
4) Repeatsteps
2) and3) several
times'
5) SetAM-SG
frequency
to 140 kHz.
Tune
sothat 140kH
can be receivedfrom AM-SG. Adjust lF transforme
T305 andT306 so that the max. readingisobtained
o
anAC voltmeter.
fql
{-\'7 I
0
2
)/2r
TUT]ING
SHAFT
- 13
-

ADJUSTMENT
OF TUNER
o Measuring
instruments
* AM signal
oscillator
(AM-SG)
* Stereo
modulator
* Frequencycounter
* AM loopantenna
' FM
signal
oscillator
(FM'SG)
* Oscilloscope
* ACvoltmeter
1. FM-RF
Adiustment
1)
Connect
theoutput
of FM'SG
to an
antenna
terminal'
Take
theoutput
froma
pin2of 1C202 andconnect
it to
the
AC
voltmeter.
2) Setthe frequencyof SGto 87.4MHz.
Tunethe pointer
of the set to the lowest frequency.Adjust the local
oscillator
coil L203 sothat 87.4
MHz canbe received
from SG. Adiustsothat the AC voltmeterregisters
the
maximum
reading'
3l Set
theSG
frequency
to 108.3
MHz.Tune
thepointer
of
the set to the highest
frequency.Adjust the trimmer
capacitor C217 so that 108.3
MHz can be received
from SG. Adjustsothat the AC voltmeterregisæn
the
maximum
reading.
ADJUSTMENT
LOCATION
DIAG
RAM
4) Set the frequency to 88 MHz. Tune the set so that 88
MHz can be received
from SG' Adjust tuning coils of
L201 and L2O2 so that the AC voltmeter registers
the
maximum reading.
5) Set the SG frequency
to 108
MHz. Tune the setsothat
108MHz can be received
from SG. Adjust trimmer
capacitorsot Ç2O2
and C206 so that the AC voltmeter
registersthe maximum reading.
6) Repeat
steps
2) through 5).
2. FM.lF, MPX Adjustment
1) Connect the DC voltmeter to pins 7 and 10 of 1C201'
Put the set in a state of not receiving
a signal.
Adjust
T201 sothat the voltmeter reads
0 + 50 mV.
2) Set the SG frequency to 98 MHz' The output should be
66 dB, 1 KHz monoral 100%
modulation'
Tune the set
so that 98 MHz can be receivedfrom SG. Connect a
distortion factor meter to terminals 1 and 2 of J202'
Make surethat the distortion factor is below 1%.lf the
distortion factor exceeds
1%,adiust
T201 again.
L2o2
@
FM
c3t7MW
s203 s20l s202
LW MW/FM MODE/MUTING
-12-

I'
I
|Cl04:TC408lBP
OPERATINc
M00E
1C105:
M52321
rf
vcc
VOLTÂGE
SETPOINT
LO6:COUTPUl{H
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cr
LED
DRIVE
Vre{ ChECK
CONSTANTVO-TÂGE
OU
TPUT
T
cTUNERSection
1G201
:HA12413
INPUT OECOUPL
IF IN(F
OECOUPLI
IF OUTIF
IF IN
(AN4)
AGC
OECO.JP.ING
AM RFEIAS
GNO
AM
OEI
AFC OUTPJl
DECOUPLiNG
FI' OUT
rO
r3
GNO
IF IN(FM)
FM MUTING OUTPUT
Nza45oI9ro t2 tt
Rest PorIo^
Cov?f Clos flt Ln JIJL LJIJL IN
'5ôt H
Cover Op€n J]JL Lnn HJ1IL J1IL JIIL JIIL
r5- r
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s203 tll
CuÊ
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Poel,on) HJI-IL JI-IL LJI-IL J]-IL JI-TL JT_IL H
s2o4
En
Srafr JI-IL JI-IL JI-TL HJI-IL LJI-IL I
szo2
El
Sroo JI-JL LJI-TL LHJ]-IL JI-IL JI-IL
vcc | 553 Sq
9V )FE
9V b
9V ON co
3ON C;F c
V6 6V ON Ot{ d
6t, CFF c
- 15
-

INTERNAL
DIAGRAMS
AND
PINOUT
OF
INTEGRATED
CIRCUITS TURNTABLE
Section
lCl0t:
t3205L
0PERATINc
M00E
1G102
:TC408l
BP0PERATINGM0DE
1G103:
MSA-Il7RS
0PERATING
M0DE
'E*lr-
OUTI
INPUl-A
V R€f
I
NPUl'B
OUT2
COMP
2
GND2
IN
IN
COMP
I
GNOI
OUT 3
vcc
ouT4
ê35b7It4 t5 r6 t7 2l zé 23 zo 27 28
A.m R€st Posiron
(Powe. ON) L H LffL JTIITL HLHLJ1IL ill J1IL L
D'rkS'de
s203
[! cuE
{Arn Down) LHILJI JI-IL JTLM
-1o; l- HHHHJI-IL JI-IL JI-IL H
szoa
El
Srart: Push LHILJI IJI-IL JTLM LHH_ft_il JI-IL LHL
s2040N
Sràrt
(Lۈd
In)
HHLLJI_JL JTLM FI HHHIJL_TL JI-TL LH
szoz
E
SIop{Plây )
Arm: Risinq
H
i
LHLLJT-TL h-JTl HHHH
I
LJLJL ill JI-TL LH
s202
A.m Outwârd
lLeed Outl
HLn-rl J]JL HLHLill JIJI TN LH
El s2o4 LHJLN LJLTL
20qr JTLITL
i2n.,rJ+- HLLJLTL
?JLTL
20d\\
JLTL
2Ot\
H
E s2o2 IHLLJT]-J]JI-
-f zo-s F- JTLITL -42 l-- H!JLTL
2JLIT ?0tt
JUL H
AuroÊnd
Oelectron L H LJn_m n n HH H
n
I
LLJI-IL nn L H L
Prn No
Actual 434Âoe9to l2 t3
No Di5t
szu -!j L
{
H
It nn
loms nn
10ms fir J1JT
10ms
L
I
Hill LLill L
JUCm UrrX
s204
r:
Stâr1 LnnLnn n n t
HHn n nn n n nnH
1
7cmOisk
s2o4
?,
Srart HJ]_TT .IIJL JL_IL JI-IL L
,l
HHJI-IL JI_IL JI-IL L
SER!O
ourr -îG6 rru coup
r
PinNo.
Mode (t oo@@@
LEAD.IN L L HHHL
LEAD,OUT LH L HLH
CUEING
(Arm up) L
Tracking Seruo
acliviated HLLHL
-14-
tN COtlPz

/-
BLOCK
DIAGRAM
TUNER
SECÎION
II
I
a
l
J*i
llrlI I
llJl I
i
r-î--l
T-J
TAPE
DECK
Section
lC50l
;
STK3l6l
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OECK
SECTION
1C701:ilP0l5590
1C502
:TA7629P
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l!iii!!i t)
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Æ21
:
HAl397
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IFHoNet
fLrFi/cuËl
I
HORTZONTALI
- 104
tiREBLE
lBAssl
Q
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tt7
901
SUPPLY
IC
rOl
TRACKT
NG
AD
J.
roN
Solenoict
Drive
From
Amp. Scclion
srzE
LAIA2
lTcm
LA
IAI
SOcm
LA IÀ4
LAIA5
LA
IA6
LAIAT
AUX
TUNER
PHONO
TAPE
CARTRIDG
!
'/
PHONOEO AMP
Q47t
/o472
ARM
POS
rTroN
DETECT t7
23f5
4
BIT
M
|CRO ta
PROCESSOR"
SOLENOID
DRIVE
16
ARM rl
HORJZONTAL
CONTROL
/
r5 0R
tvE
ARM
DIRECTION
CONTROL
t IC|O3 ?
Qr18.
il9
33/45
T/T
+ oD MOTOR
T,/T MOTOR
SWITCH
ING
POWER
SUPPLY
-18-

x-7
BLOCK
DIAGRAM
TUNER SECTION
FM FRONTEND
Q20l 0202
FM
IP
TIo
AM
A
UTO
dh
IT
ll
MONO
AM ANT
FILTER
455KHz
o205 ,/
I
DETUNE
Qa|l
/
Q2t2
DECKSECTION
REC
æPB
s430
{
IRECLEVELI
PB EO AMP
IC50l/
601
1c502/602
TURNTABLE
SECTION
lsrzEl
tPosrTroNI
nesA
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[|
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FEPEAT-l
IsPEEdl
IIEPEAiI
@
@
lcovER-l
lwoRNrNG
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r-rr
J)osst
'Y''
t, RECEO
REc<+PB
s430
AMP
+B
lpoLBy'l
B
IAS
osc
UNIT
IBEAT CANCELI
-17-
D
IA5