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
----