Service Manual
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CD Portable
FM Stereo /AM Radio
Cassette Recorder
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MCD-ZI 6F (AU)
(NZ)
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Specifications
(
CASSETTE SECTION )
Recording system . . . . AC bias, 4 track stereo
-.
Erasing system . . . . . . Magnet erase
Tape speed . . . . . . . . . 4.75 cm 1 sec.
Fast forward and
rewind time . . . . . . . . .
110 sec. (C-60 tape)
Frequency response . . 80- 12,000 Hz (Normal tape)
(CD SECTION )
Channels . . . . . . . . . . . 2 channels
S/ N ratio . . . . . . . . . . . 70dB
Wow & Flutter . . . . . . . undetectable
Sampling frequency . . . 44.1 kHz
Quantization . . . . . . . . . 16 bits linear/ ch
Pick-up light source . . . Semi-conductor laser
Pick-up wave length . . . 79o nm
Specifications subject to change without notice.
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.
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,,...,.
,,.
.
( RADIO SECTION )
Tuning ranges . . . . . . . FM :88-108 MHz
AM :525-1,710 kHz
Antennas . . . . . . . . . . . Built-in ferrite bar and
telescopic rod antennas
( GENERAL)
Output power . . . . . . . . 4.0 W x 2 (DC max.)
Speaker . . . . . . . . . . . . 12cmx2,40hms
Terminal impedance . . PHONES :32 ohms
POWW source . . . . . . . . AC :230-240 V, 50 HZ
Dc:
12V
( 8 x “D “ size batteries)
Dimensions . . . . . . . . .
558( W)x170(H)x215(D)m~
Weight . . . . . . . . . . . . .
Approx. 3.4 kg including batteries
REFERENCE
No. SM580208
LASER BEAM SAFETY PRECAUTIONS
.
Pick-up that emits a laser beam is used in this CD player.
~ J -:’”’
CAUTION :
USE OF CONTROLS OR ADJUSTMENTS
OR PERFORMANCE OF PROCEDURES
OTHER THAN THOSE SPECIFIED
HEREIN MAY RESULT IN HAZARDOUS
RADIATION EXPOSURE
LASER OUTPUT ........0.6 mW Max. (CW)
WAVELENGTH ........... i’90 nm
, ...... ----
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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 7 rear cabinet
mounting screws. ( } )
b. TOP PANEL
(1) Remove the 4 top panel
mounting screws.
(2) Remove the top panel.
(3) Remove the chuck pulley.
......
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REMOVAL AND INSTALLATION
c. “O” POINT ADJUSTMENT
d. ROD ANTENNA TERMINAL
-o- POINT
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TERMINAL
TERM NAL
..-,
...-
TAPE DECK ADJUSTMENTS
a. HEAD REPLACEMENT
● After replacement, demagnetize the heads by
using a degausser.
● Bq sure to clean the heads before attempting
to make any adjustments.
● All wiring should be returned to the original position
after work is completed.
. .
.
.,
,, .... . .-
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b. MOTOR SPEED ADJUSTMENT ‘
., ,
(1)
Insert the test tape ( MTT-I 11N, etc., 3000 Hz ) into
(2)
(3)
..
—
tape deck.
Press tape deck PLAY button.
Adjust SVR so that the frequency counter shows are
reading of 3,000 Hz.
c. CHECKING THE MECHANISM TORQUES AND TENSION
.
Clean the head, capstan and pinch roller before making any measurement.
I Measurement I
Take-up torque
I
Back tension
I Tape tension I
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
60 gr or more
F.FWD
55-120 gr.cm
REW
55- 120gr.cm
-2-
.
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)
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 turnlable.
Remove the two screws ( Ml-3 ) and remove the spindle
motor ( Ml-5 ).
Attach the special washer ( Ml-4 ) to the spindle motor.
..
Apply a small amount of a mixture of the “Three Bond 2001”
and “2015F” 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 a piece of cloth, or similar
material ) any b,onding 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
(3)
latch with any way driver from
( Ml-1 ).
If the pick-up is reconditioned
bottom of chassis
or replaced, be sure to wipe
MI-2+
r
I
-.
d
8-
Don’t ●ttached bondtng material
at the too of shaft
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Be sure to wipe away the
bonding matearial
CHUCK PULLEY
\
. .
/
w
-——
- 17.15mm
—
*0.lmm
—
\
—=
- ‘x”
F
Ml-2
the rails clean and also apply a coating of FLOIL ( G-474B ) to
u
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‘ (SHAFT)! ‘-’
1
their entire circumference and entire length.
M1-5(SPINDLE
After replacement, install the shaft as before.
MOTOR SHAFT)
The pick-up P.C.Board pattern is
“shorted”, as shown in the
“m
(4)
(5)
figure , so that the new pick-up will not be susceptible to the
effects of static.
(6) Set the pattern to
“OfX?n” after the pick-up has been
replaced.
SHORT
M6
Ml’
1“
m
.-.
......
“.
CD PLAYER ADJUSTMENTS
b. PREPARATIONS
WA”
(a) Measuring instruments, tools and filter
(I j
(2)
(3)
(4)
Test disc. : YEDS 18 ( SONY ) or etc.
Oscilloscope : SS5711
(1O MHz or dual-phenomenon )
or Memory scope : DSS6521 (Storagescope)
DC digital voltmeter (Input impedance
1M ohm 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, 1 A
1 M ohm 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 a flat and level su
to operate it.
POWER SWITCH
‘~
CN951-
. .
-.
.
c. PARTS LOCATION
Q~+
.-..
Pf.d
I
II
CN403
P
CN404
L
TP4
-M ‘“ :__..
GND
TP2
❑
Vc
TP5
2’ ‘;
RF
TP 1
@lz#
SVR302
(
—
CN301
..
-5-
..
“E
.
~....,.
CD PLAYER ADJUSTMENTS
Adjustment
Measuring
Short-
Input
Item
circuit
instrument
connection
location
‘(a) PLLVCO
Frequency counter
free-run
SHORT 1
—
Oscilloscope
(b) Tracking
L.P.F.
SHORT 1
—
balance
(c) Checking
the “eye” Oscilloscope
—
—
pattern
d. ADJUSTMENTS
( a ) PLL VCO free-run adjustment
(1) Test disc removed from the unit.
(2), Short-circuit points 1 on the printed-circuit board.
(3)
(4)
(5)
(6)
(b
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
‘ Connect a frequency counter to TP 5 ( PLL ) and
TP 4 ( GND ).
Switch ON the DC power ( 12.0 V ) ,’ ‘,.,..--: - “
(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 sho~t-circuitpoint 1
on the printed-circuit board. ‘“’
., ..,--
) Tracking balance adjustment
Short-circuit points 1 on the printed-circuit board .. ..- .:-,
Connect an oscilloscope to TP 1 (TE) and TP 2 (VC 2.5V).
Switch ON the DC power.
.“
Set the test disc.
PLAY switch push ON.
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.
( c ) Checking the eye pattern
. The adjustments (a) - (b) complete the adjustments of
the CD player.
Next, check the eye pattern waveform.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Switch ON the DC power.
Connect an oscilloscope to TP 3 ( RF) and
TP 2 (VC 2.5V ).
Load !he 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.
..
-6-
Output
Adjust-
ment Adjustment value
connection
location
TP 5 (PLL)
—
4.300 MHz -5.000 MHz
TP 4 (GND)
TP1:TE
SVR302
Waveform symmetry
TP 2: VC2.5V A=B 1.5 Vp-p
Check be sure that the
TP3:f?F
“eye” pattern is at the
TP 2: VC2.5V
—
center of the waveform
and that the diamond
shaoe is clearlv defined
,.
,,. ,...
!-
.
!“-, .
L.P. F. “-
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1-
FREQUENCY
COUNTER
OSCILLOSCOPE
Ow
1.5vp-p
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A-B
OSCILLOSCOPE
c
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. . . .
TUNER ADJUSTMENTS
. Use a plastic screw driver for adjustments.
_/
● Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Supply voltage
DC 12.0 V
Phones impedance
: 32 ohm
Standard output : 0.5 mW (126
mV)
Function switch : RADIO
TONE controls : HIGH
PARTS LOCATION
. -.
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LOOS
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LO06
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VTVM
Oscilloscope
a.
AM ADJUSTMENT :. BAND SELECT SWITCH : AM
Adjusting
Connections
Step
Circuit
SG Frequency
Position of tuning dial
Adjustment
Input output
Closed the output
Connect sweep
terminal by sweep
1
IF
generator to
::yo;:r’ ‘t “ace C109(H) & R202(G)
455
kHz
Low
T104
2
Tuning
Connect AM SG
Connect VTVM to
517kHz
Low end
LO06
3
coverage
to
Test Loop
speaker terminals
1750 kHz
High end
VCT -4
4
Tracking
Connect AM SG
Connect VTVM to
600 kHz
600 kHz
LOOS
5
to Test Loop
speaker terminals
1400 kHz
1400 kHz
VCT -3
e Repeat adjustments
--l
-fF-
-+
Max.
Max.
I
iii
.... -
TUNER ADJUSTMENTS
b.FM ADJUST!
Adjusting
Step
Circuit
1 IF
2
Tuning
3
coverage
4
Tracking
IENT BAND SELECT SWITCH : FM
FM
Dummy antenna : 75 ohm
Connections
I
SG Frequency Position of tuning dial Adjustment
[CDUt
Outvut
Connect sweep I
Connect sweep \
I
generator to
I
generator to
I
10.7 MHz
ICOO1O (H) RO04 (H)
I
Low
I
I
T103
& TP 2 (G)
& R202 (G)
I
I
I
I
Connect FM SG
Connect VTVM to
87.0 MHz
Low
end
LO02
to TP1 (H) & TP2 (G)
speaker terminals
109.0
MHz
High end
VCT-2
I
I
Connect FM SG Connect VTVM to 98.0 MHz
98 MHz
VCT-1
to TP1 (H) & TP2 (G)
speaker terminals
unbalance
d
- ‘ VTVM
Oscilloscope
Max.
Max.
1
[ 5 I Repeat adjustments
-,.
c. FM VCO ADJUSTMENT BAND SELECT SWITCH : FM
(1)
Input signal :
60 dB
22.5kHz Non-modulation. at 98.0 MHz
1 Connection : Hot to TP-1, Ground to TP-2
Pilot signal : OFF
(2) Adjustment : VR201 . . . .. , .-
,---
FREQUENCY :76.00 kHz t~O.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 ~ 0.1.5 kHz. ,-. . ...
...
.. .- . .,, ..
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RANGE: 10mV
Cu
:
270K
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VOLTMETER
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INPUT OUTPUT
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