Sanyo MCD-Z1F User manual

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Service Manual ——.
Portable CD /
AM /FM Stereo /
Cassette Recorder
FILE NO. “-- ‘1
MCD-ZI F(AU)
.“..
..-?
.
.—. .
Specifications
.-. .
.
.
,..../:
.-.
(CASSEITE SECTION )
Recording system . . . . AC bias, 4track stereo
Erasing system . . . . . . Magnet erase
Tape speed .......-. 4.75 cm Isec.
Fast forward and
rewind time ......... I I osec. (C-60 tape)
Frequency response . . 80- 12.000 HZ (Normal tape)
(CD SECTION )
Channels ........... 2channels
S/ Nratio .........-. 70dB
wow &Flutter .....-. undetectable
Sampling frequency ... 44.1 kHz
Quantization ....----- 16 bits linear 1ch
Pick-up light source .-. Semi-conductor laser
Pick-up wave length ... 790 nm
Specifications subject to change without notice.
(RARE(3 SECTION )
Tuning ranges ....... FM: 88- 108 MHz
AM :525-1,710 kHz
Antennas ........... Built-in ferrite bar and
telescopic rod antennas
(GEMERAL )
Outm power . . . . . . . . 4.0 Wx2(DC max.)
Speaker . . . . . . . . . . . . 12cmx2140hms
Terminal impedance . . pHONES :32 ohms
Powem source . . . . . . . . AC :230-240 V, 50 Hz
DC: 12V
(8x“D “size batteries)
Dimensions . . . . . . . . . 556( W)x170(H)x210(D)m
Weight . . . . . . . . . . . . . Approx. 3.4 kg including batteries
REFERENCE No. SM580195

ii
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LASER BEAM SAFETY PRECAUTIONS
.Pick-up that emits alaser beam is used in this CD player.
-. d
CAUTION :
USE OF CONTROLS OR ADJUSTMENTS
OR PERFORMANCE OF PROCEDURES
OTHER THAN THOSE SPECIFIED
HEREIN MAY RESULT IN HAZARDO
RADIATION EXPOSURE
LASER OUTPUT ........0.6 mw Max.
WAVELENGTH ...........7’90 nm
.
REMOVAL AND INSTALLATION
.Disconnect the power cord’s plug from the electrical outlet.
.All wiring should be returned to the original position after work is completed.
.First have ready many the new FIXERS (614 129 4971) for replacement.
●Arrange the lead “wires so that they are not near the heat sink.
.,.,.
a. CABINET
(1) Remove the battery lid.
(2) Remove the 7rear cabinet
mounting screws. (})
b. TOP PANEL
(1) Remove the 4top panel
mounting screws.
(2) Remove the top panel.
(3) Remove the chuck pulley.
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REMOVAL AND INSTALLATION
c. “O” POINT ADJUSTMENT
-o-mm-r
M
49
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y
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FOINIER -\
-.
...-
.“ -.-4
. .
.. TAPE DECK ADJUSTMENTS
a. HEAD REPLACEMENT
.After replacement, demagnetize the heads by
using adegausser.
●Be sure to clean the heads before attempting
.
. .
d. ROD ANTENNA TERMINAL
-. d
II
to make any adjustments.’
●All wiringshould be returned to the original position
after work is corn-pleted.
. .
,-.
Irisert the test tape (MTT-111 N, etc., 3000 Hz )into
tape deck.
Press tape deck PLAY button.
Adjust SVR so that the frequency counter shows are
.3’ -. .-
.: ..,,
b. MOTOR SPEED ADJUSTMENT
(1)
(2)
(3) reading of 3,000 Hz.
d
*
.WHIT Ow
w
14’#1
. .
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,7
TORQUES AND TENSION
c. CHECKING THE
.Clean the head, capstan and pinch roller before making any measurement.
Measurement Take-up torque Back tension Tape tension 1
Cassette for PLAY:TW-2111A Drive-power cassette
PLAY:TW-21 11A
measurement F.FwD/REw:TW-2231 TW-2412
PLAY 30-60 gr.cm 2.0- 4.5 gr.cm 60gr or more
F.FWD 55-120 gr.cm
REW 55-120 gr.cm
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CD PLAYER ADJUSTMENTS
a. DISASSEMBLY OF THE CD PLAYER MECHANISM
(a) Replacement of the spindle motor
●First, prepare the new turntable (Ml -2 )and new special
washer (Ml -4 )for replacement.
The removed turntable will be deformed by the heat of the
soldering iron, and cannot be reused.
.Prepare dial type calipers.
(1)
(2)
(3)
(4)
(5)
(6)
,(7)
(b)
(1)
(2)
(3)
(4)
(5)
(6)
The attached bonding material can be dissolved by using a
60W soldering iron to heat the shaft at the lower part of the
turntable (Ml-2 )for about one minute.
The turntable can then be removed from the shaft by very
carefully applying force upward at the center of the lower
surface of the turntable.
Remove the two screws (Ml-3 )and remove the spindle
motor (Ml-5 ).
Attach the special washer (Ml-4 )to the spindle motor.
Apply asmall amount of amixture of the “Three Bond 2001”
and “201 5F” bonding materials to the motor’s shaft.
Install the turntable as shown in the figure.
Secure the turntable by pressing gently.
Be sure to wipe away (by using apiece of cloth, or similar
material )any bonding material coming out of the hole.
Replacement and lubrication of the pick-up
Before replacement of the pick-up, be sure to carefully read
the section regarding the pick-up when the unit is moved or
transported.
Remove the two pick-up rail (Ml 2)with care fixing the two
latch with any way driver from bottom of chassis
(Ml-1 ).
If the pick-up is reconditioned or replaced, be sure to wipe
the rails clean and also apply acoating of FLOIL
their entire circumference and entire length. (G-474B )to
After replacement, install the shaft as before.
The pick-up P.C.Board pattern is “shorted”, as shown in the
figure ,so that the new pick-up will not be susceptible to the
effects of static. .
Set the pattern to “OPs?tI” afler the pick-up has been
replaced.
SHORT
OPEN
f!9-
4
-d” “.
.
.Ml-5
Don’t attached bonding material
at the top of shaft
b@ending material
I~p~
—.——. MI-4
8-I&m (-CM wASHER)
——
Ml-1
(CHASSIS)
Be sure to wipe away the
bonding mateariat CHUCK PULLEY
,.. ,.
II MOTOR SHAFT)
v’ I** 4—
I
M12
-3-
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...

.-,...,.
.CD PLAYER ADJUSTMENTS
/- +f?
(BE SURE, AT THIS TIME, NOT
TO TOUCH ANY OTHER PART. )mm
(c)
(1)
(d)
(1)
(2)
...-. (3)
>
(4)
J
(5)
(6)
(7)
(e)
(1)
(2)
.’.-.:..,
...’ .- ..
L/
Sled motor replacement (BE SURE. AT THIS TIME, NOT
See illustration at right. TO TOUCH ANY OTHER PART. )
Checking the operation of the CD mechanism
Disconnect the socket (for the sled motor power supply) from
the printed-circuit board.
Apply avoltage of DC 2.0 Vto the sled motor’s Ml-1
terminal.
Measure the current during sled motor operation.
●The direction of movement of the pick-up (outer groove or
inner groove) can changed by changing the battery polarity.
The current during sled motor operation varies
according to the positional relationship of gears
(M8and M9). .
If the current exceeds 40 mA ,remove the
pipe (M7 )and gears (M8, M9 ).
Apply asmall amount of’s FLOIL (G-474B )bonding
materials to the chassis shafts. ‘-’
Install the pipe and gears as shown in the illustration.
.. .
.
. . . .. . . .
M? M8
M3
MS
Resetting the pick-up to the home position
The limit switch is switched ON by the projection of the rack
gear secured to the returned pick-up, afler which the sled
motor continues to operate (by the circuit) for approximately
20-30 milliseconds ;there is then again areverse
operation, and movement to the position at which the switch
is switched OFF.
Rotation continues for about 20-30 milliseconds after the
switch is switched OFF, and then the pick-up stop at home
position.
..- . .
-4-
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~,
Mll —
Direction of pick-up movement Sled motor current
Outer groove 40 mA or less
.Inner groove 40 mA or less
.- .. . -- Ma
“9
--- $B
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LIMIT
SWITCH
(@
Q
‘-- PICK-
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ii
.-..
CD PLAYER ADJUSTMENTS
b. PREPARATIONS ./
(a) Measuring instruments, tools and filter
(1)
(2)
(3)
(4)
Test disc. :YEDS 18 (SONY )or etc.
Oscilloscope :SS5711
(1OMHz or dual-phenomenon )
or Memory scope :DSS6521 (Storagescope)
DC digital voltmeter (Input impedance
1Mohm or more )
AC voltmeter (- 80 dB, input impedance
(5) AF oscillator (400 Hz, 300 mV RMS )
(6) Frequency counter (5 MHz ;or more )
and probe (10 :1)
(7) Screwdrivers (non-metallic )for adjustments
(8) Low Pass Filter (L.P.F. )
(9) DC Power supply :12 V, 1A
1Mohm or more)
(b) Component locations diagram
●Work can be simplified by removing
the printed circuit boards from the CD mechan
and placing then as shown in the illustration.
.Place the CD mechanism on aflat and level su
to operate it.
POWER SWITCH
‘-. CN951
..!, .,
.. . ..
,.
..-.
c. PARTS LOCATION
“’””--.-A- \
.’. .
I
kCN402
)
CN403
P
CN404
TP2
a
Vc B
SVR302
TP 1
❑
TE
TP4
Zzl
GND
TP5
@TP3
‘L’ tzz
RF
E==R=a
CN301 1
..
-5-

..- . ... . . .
.
CD PLAYER ADJUSTMENTS
.- .,
.:.
.:
J
., .,,
.. .,
Adjustment Measuring Short- Input output
Item circuit
instrument connection connection
location
(a) PLLVCO Frequency counter SHORT 1TP 5(PLL)
—
free-run TP 4(GND)
Adjust-
ment
location
--- .A
Adjustment value
4.300 MHz -5.000 MHz
Waveform symmetry
A=B 1.5 Vp-p
Check be sure that the
“eye” pattern is at the
center of the waveform
and that the diamond
ShaDe is clearlv defined
SVR302
(b) Tracking Oscilloscope
L.P.F. SHORT 1TPI:TE
—
balance TP 2: VC2.5V
(c) Checking
the “eye” Oscilloscope TP3:RF
—
pattern TP 2: VC2.5V —
d. ADJUSTMENTS
t
(a
(1)
(2)
(3)
)PLL VCO free-run adjustment
Test disc removed from the unit. TP5 ~
Short-circuit points 1 on the printed-circuit board.
Connect afrequency counter to TP 5(PLL )and
TP 4(GND ). TP4 ~
Switch ON the DC power (12.O,V ). . .-
FREQUENCY
COUNTER
(4) (See component locations diagram at page 5)
Check the reading of the frequency counter !.
.-
is 4.300 MHz -5.000 MHz. ‘“ .
-,
~:
Cancel the short-circuiting of short-circuit point 1~‘~“~”-
on the printed-circuit board. -..’. ... ,”,
.,1, ~~ L.P. F.
,
(5)
(6)
-..
(b)Tracking balance adjustment ‘TP1<~~~ +I
(1)
(2)
(3)
(4)
(5)
(6)
Short-circuit points 1 on the printed-circuit ward..,,. ;. . .“ ..
Connect an oscilloscope to 1P 1(TE) and TP 2(VC 2.5V).~Y ;~-:--,y.-, IN -
‘-’”-- 3;
Switch ON the DC power. ‘------- .. ...... .. -—.---..-–.-.--12- .~p ~.-... -
Set the test disc. -1
PLAY switch push ON.
OSCILLOSCOPE
Cancel the short-circuiting of short-circuit point 1
on the printed-circuit board.
Adjust SVR302 so that the oscilloscope’s waveform is .
symmetrical, as shown in the illustration.
Switch OFF the DC power.
Ov 1.5vp-p
1VIDIV h-g
(7)
(8)
(c
●The adjustments (a) -(b) complete the adjustments of
the CD player.
Next, check the eye pattern waveform. ‘p’ 1 OsclLLOscOpE
)Checking the eye pattern +~
Switch ON the DC power.
Connect an oscilloscope to TP 3(RF) and
TP 2(VC 2.5V ).
Load the test disc.
PLAY switch push ON.
Check to be sure that the “eye “pattern is at the center
of waveform and that the diamond shape is clearly defined.
Press the STOP button.
Switch OFF the DC power.
(1)
(2) I
(3)
(4)
(5) 0
(6)
(7) H-ttni-ti-n AA/
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... -
TUNER ADJUSTMENTS
●use aplastic screw driver for adjustments.
.Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter. -.. 4
Supply voltage :DC12.OV
Phones impedance :32 ohm
Standard output :0.5 mW (126 mV)
Function switch :RADIO
TONE controls :HIGH
PARTS LOCATION
I
. . . . . .
2-,. .,-..!
., ..,-, ._.... :r-
a. AM ADJUSTI
FR=
IF
1IF
2Tuning
3coverage
4Tracking
5
/ \
b-- “.“
[
‘5’‘aq-
VCT-2@
P
@vc?-
0
HLOO
LO02
T104
“ml IEil ‘ll-
“;TP2
cg9 (E)
*] @vR201 -;“’ .
I...’
2/
3c
5“’
.. ....
,,..
TP1” ‘: ‘-” -,
tu\
J‘. -,
—-. ..— j
IENT BAND SELECT SWITCH :AM
,-.
\Conne
Input
Closed the output
terminal by sweep
generator, it place
to LO05.
Connect AM SG
to Test Loop
Connect AM SG
to Test Loop
tions VTVM
SG Frequency position of tuning dial Adjustment
output Oscilloscope
Connect sweep II
generator to
C109(H) &R202(G) 455 kHz Low
II
T104 -4-
Connect VTVM to 517kHz Low end LO06
speaker terminals Max.
1750kHz High end VCT -4
Connect VTVM to 600 kHz 600 kHz LO05
speaker terminals Max.
1400 kHz 1400 kHz VCT -3
GlRepeat adjustments
-..
-7-
.:

..
i
...,.,.,.
.... TUNER ADJUSTMENTS
b.FM ADJUSTMENT BAND SELECT SWITCH :
Adjusting Connections
Step Circuit Input output
Connect sweep Connect sweep
1IF generator to generator to
Icool Q1 (H} RO04 (H)
&TP 2(G) &R202 (G)
2Tuning Connect FM SG Connect VTVM to
1
3toTPl (H) &TP2 (G) speaker terminals
coverage
4Tracking Connect FM SG Connect VTVM to
toTPl(H)&TP2(G) speaker terminals
I11
5ReDeat adjustments
‘M FM Dummy antenna: 750hm
SG Frequency Position of tuning dial Adjustment
10.7 MHz Low T103
87.0 MHz Low end LO02
109.0 MHz High end VCT-2
98.0 MHz 98 MHz VCT-1
rebalance
‘- Ilfvh.1
Oscilloscope
n
Max.
.-,.....
:..
f
c. FM VCO ADJUSTMENT BAND SELECT SWITCH :FM
(1) Input signal :60 dB 22.5kHz Non-modulation. at 98.0 MHz
Connection :Hot to TP-1, Ground to TP-2
Pilot signal :OFF
(2) Adjustment: VR201
FREQUENCY :76.00 kHz ~0.15 kHz
●FREQUENCY COUNTER SENSIBILITY :HIGH LEVEL (more than 20 mV p-p )
.Adjust VR201 so that the frequency counter shows are reading of 76.00 kHz +0.15 kHz. ‘.
.. .
‘, ~,-.,
..- ‘. -~. .’
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“.-... . ..
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EXPLODED VIEW (CABINET &CHASSIS)
.;
$2+5!!!233.*
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15 Yll U3 1uo~ Iw%$
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