Sanyo MCD-Z150F User manual

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FILE NO.
I
Service Manual
Portable CD/Stereo Radio
MCD-Z150F (XE)
Cassette Recorder
Specifications
(Cassette Section)
Recording system........................AC bias, 4 track stereo
Erasing system............................. Magnet erase
Tape
speed
..................................4.6 cm
I sec.
Fast forward and rewind time..
....
.I10 sec. (C-60 tape)
Frequency response....................60
- 14,000 Hz (Normal tape)
(CD Section)
Channels..................................... .2channels
Wow & Flutter................. _. ............ Undetectable
Samplingfrequency.................... .44.1 kHz
Quantization.................................166 bitslinear / ch
Pick
up lightsource ...................... Semi-conductor laser
Pick up wave length....................
.790 nm
Leaser output............................... Continuous wave max. 0.6mW
PRODUCT CODE No.
142 660 04
(Radio Section)
Tuning ranges . . . . . . . . . . . . . FM : 67.5 - 106 MHz
AM : 526.5 - 1,606.5 kHz
Antennas
. . . . . . . . . . . . . . . . . . . . . Built-in ferrite bar and
telescoping rod antennas
(General)
Power output _.............. 2.8W / ch (DIN music)
Speaker . . . . . . . . . . . . . . . . . . . . . . . 10 cm x 2, 8 ohms
Terminal impedance
PHONES
. . . . . . . . . . . . . . . . . 32 ohms
Power source . . . . . . . . . . . . . . AC : 230 V, 50 Hz
DC : 12 V, 8 “R14/C” batteries (not supplied)
Dimensions
. . . . . . . . . . . . . . . . .
412x158x239mm(WxHxD)
Weight (approx.) . . . . . . . . . . 2.6 kg (without batteries)
Specifications subject to change without notice.
REFERENCE No. SM580806
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LASER BEAM SAFETY PRECAUTIONS
l Pick-up that emits a laser beam is used in this CD player.
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 . . . . . . . . . . . . . 790 nm
1 CAUTION -INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
ADVARSEL - USYNLIG LASER STRALING VED ABNING, NAR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION, UNDGA UDS ATELSE
FOR STRALING.
VARNING - OSYNLIG LASER STRALNING NAR DENNA DEL AR OPPNAD
OCH SPP;RR AR URKOPPLAD. STRALEN iiR FARLIG.
VORSICHT - UNSICHTBARE LASERSTRAHLUNG TRITT AUS, WENN A
DECKEL GEOFFNET UND WENN SICHERHEITSVERRIEGELUNG
UBERBRUCKT IST. NIGHT. DEM STRAHL AuSSETZEN.
VARO - AVAllAESSA JA SUOJALUKITUS OHITElTAESSA OLET ALlTlINA
NAKYMATTOMALLE LASERSATEILYLLE. iiLii KATSO SiiTEESEEN.
REMOVAL AND INSTALLATION
l Disconnect the power cord’s plug from the electrical outlet.
l All wiring should be returned to the original position after work is completed.
l First have ready many the new FIXERS (614 129 4971) for replacement.
l Arrange the lead wires so that they are not near the heat sink.
a. CABINET
b. TOP PANEL c. CASSETTE LID
PU
PUSH
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REMOVAL AND INSTALLATION
d. CD MECHANISM e. CD P.W.BOARD
f. OPEN/CLOSE P.W.BOARD g. DISPLAY P.W.BOARD
EN/CLOSE P.W.B
h. MAIN P.W.BOARD BLOCK
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REMOVAL AND INSTALLATION
i. TUNER P.W.BOARD
k. WIRING
i-
“0” POINT ADJUSTMENT
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SET P6INTER START
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l TAPE MECHANISM
/ii\
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\
‘C-MECHA (HEAD)
SPEAKER -
C-MECHA & MOTOR
‘CN412
- CN422
- CN416 R/P SWITCH P.W.B.
- CN417
-3-
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REPLACEMENT OF CD MECHANISM
l Note that the mechanism of the CD player is very delicate.
l It is very important that the spindle motor (witch rotates the disc), and the sled motor (which cases the disc signals to be tracked), as
well as the gear and other components, operate smoothly, without eccentricity.
l When handling the pickup, take care not to exert excessive force, and particular care should be taken not to touch the lens or the
drive circuit’s P.W.Board pattern.
a. Replacement of the spindle motor
l First, prepare the new turntable (CM1 -2) and new special washer
.
.
(1
(2)
(3)
(4)
(5)
(6)
b.
(1)
(2)
(3)
(4)
(5)
(6)
(CMI-4) for replacement.
The removed turntable will be deformed by the heat of the
soldering iron, and cannot be reused.
Prepare dial type calipers.
The attached bonding material can be dissolved by using a
60W soldering iron to heat the shaft at the under part of the
turntable (CMl-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 (CM1 -3) and remove the spindle motor
(CMl-5).
Attach the special washer (CMI-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.
Initial the turntable as shown in the figure. Secure the turntable
by pressing gently. Be sure to wipe away (by using a price of
cloth, or similar material) any bonding material coming out of
the hole.
Don’ t attached bonding material
at the top Ot Shalt.
i
r Bondlng material
u
SHAFT
Be sure to wipe away
the bonding material.
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Ct?JCK PULLY
TURN TABLE
SPINDLE MOTOR
Confirm of inclination for the turntable
Connect the digital voltmeter as shown in the figure.
Set the test disc (YEDS18), press the PLAY button (Playback
for the most inner music).
At this time, record voltage value to indicate at the digital
voltmeter.
Access the most outer music, press the PLAY button (Playback
for the most outer music).
Again at this time, record voltage value to indicate at the digital
voltmeter.
For reference at the recorded voltage of the most inner music,
confirm at + 300mV less than for recorded voltage of the most
outer music.
Unit
F+
+
Digital
Voltmeter
VC
Low Pass Filter
-4-
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I
REPLACEMENT OF CD MECHANISM
c. Replacement and lubrication of the pickup
l Before replacement of the pickup, be sure to carefully read the
section regarding the pickup when the unit is moved or
transported.
(1)
.
(2)
.
(3)
.
.
Remove a pickup rail (CM2) with a driver from the bottom of
chassis.
When removing or inserting the pickup rail from or into chassis,
take care not to exert excessive force.
When the pickup is reconditioned of replaced, be sure to wipe
the rails clean and also apply a coating of FLOIL (G-4748) to
there entire circumference and entire length.
When applying the grease, do not allow any grease to adhere
to any other parts.
Pass the pickup rail (CM2) through the new pickup (CM7).
The pickup P.W.Board pattern is “shorted”, as shown in the
figure, so that the new pickup will not be susceptible to the
effects of static.
Set the pattern to “open” after the pickup has been replaced.
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(short) (open)
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d. Checking the action of the CD mechanism
e. Replacement of the sled motor
(1) Disconnect the socket (for the sled motor power supply) from (1) Remove two screw (CYl) and remove the sled motor (CM3).
the P.W.Board.
(2) Apply a voltage of DC 2.OV to the sled motor’s terminal.
(3) Measure the current during sled motor operation.
l The direction of movement of the pickup (outer groove or inner
groove) can changed by changing the battery polarity.
(4) The current during sled motor action varies according to the
positional relationship of gear (CM5, CM6).
(5) If the current exceeds 40mA, remove the gears (CM5, CM6).
(6) Apply a small amount of a FLOIL (G-4748) bonding materials
to the shaft.
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REPLACEMENT OF CD MECHANISM
f. Resetting the pickup to the home position
(1) The limit switch is switched ON by the projection of this rack
gear secured to the returned pickup, after which the sled motor
continues to operate (by the circuit) for approximately 30 msec.
: There is then again a reverse operation, and movement to
the position at which the switch is switched OFF.
(2) Rotation continues during about 30 msec, after the switch is
switched OFF. And then the pickup stops at home position.
CONFIRM OF CD SECTION
a. Preparation
l Measuring instruments and Test disc.
(1) Test Disc : YEDS 18 (SONY)
(2) Oscilloscope : SS5711 (10 MHz and Dual Phenomenon)
NOTE : CD section of this unit can not need adjustment, because CD P.W.Board checked at automatic checker.
b.
(1)
(2)
(3)
(4)
Confirm of general operation
Set the test disc.
Press the PLAY button, then confirm the disc rotating to clockwise direction.
Press the SKIP/SEARCH button, then confirm the most inner music or most outer music accessing at speedy.
Press the STOP button.
Connect an oscilloscope to RF(=IClOl pin41(H)) and VR RF
O----_-I--I
c. Confirm of eye pattern
(1)
(J1315).
(2)
Set the test disc, press the PLAY button.
(3)
(4)
Check to be sure that the “eye” pattern is at center of waveform
and that the diamond shape is clearly defined.
Press the STOP button.
+b
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OSCILLOSCOPE
I I I
I I f Ill1 I
OPENING EXPANDED
L
-6-
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TUNER ADJUSTMENTS
l Use a plastic screw driver for adjustments.
l Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Supply voltage
: DC 12.OV
Phones impedance : 32 ohms
Standard output
: 50mW
Function switch : RADIO
a. Parts Location
XF201
\
L2> 03
,TP202
VCT-3
VCT-1
VCT-2
VCT-4
L2102 L2104 1 Xj213
XF211
b. AM Adjustment
BAND SELECT SWITCH : AM
VTVM
Oscilloscope
Step Adjusting
Circuit
Connections
I
SG Frequency
Input
output
Position of
tuning dial Adjustment
Closed the output Connect sweep
terminal by sweep generator to
generator, it place C2106 (H) &
455 kHz
to L2103. J2107 (E)
1
IF
Tuning coverage
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Connect AM SG to Connect VTVM to
test loop
speaker terminals I+
2
Max.
3
4
Max.
Connect AM SG to Connect VTVM to 600
kHz
test loop speaker terminals 1400
kHz
Tracking
5
1400 kHz
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VCT-3
c. FM Adjustment
BAND SELECT SWITCH : FM
FM Dummy Antenna : 75 ohm unbalance
Adjusting
Circuit
Connections
SG Frequency
Input output
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Connect sweep Connect sweep
generator to
IC201 lpin (H) &
generator to
C2106 (H) &
10.7 MHz
TP202 (E) J2107 (E)
Position of
tuning dial
Adjustment
VTVM
Oscilloscope
Step
1
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IF
Tuning coverage
‘Onnect FM SG to
TP201 (H) &
Connect VTVM to 96 MHz
TP202 (E) speaker terminals
-7-
4
I I
Tracking
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TAPE ADJUSTMENTS
a. Adjusting Azimuth
l Be sure to clean the heads before attempting to make any adjustment.
l Be sure both channel’s waveform are the same for the phase matching.
l Be sure both channels (1 and 2) are the same level using a dual-channel oscilloscope.
l After completion of the adjustment, apply the threadlock (TB-1401 B) to the azimuth adjustment screws to fix them securely.
(1)
(2)
(3)
Load an azimuth adjustment test tape (VTT-703 etc., 10 kHz)
in tape deck.
Press the PLAY button.
(4)
Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that the left and right outputs are maximized.
Press the STOP button.
HEAD
AZIMU
b.
Replacing the Head
l After replacing the head, demagnetize the head by using a
degausser.
RIP I-ltAD
l All wiring should be returned to the original position after work is
completed.
c. Replacing the Motor d. Adjusting Tape Speed
l Use a plastic screwdriver for adjustment.
(1) Inset the test tape (MTT-I 11 N etc., 3000 Hz).
(2) Press the PLAY button.
(3) Use a flat-tip screwdriver to turn the SVR to adjust so that the frequency
counter becomes 3000 Hz.
e. Checking the Mechanism Torques
l Clean the head, capstan and pinch roller before making any measurement.
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Measurement
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Cassette for
measurement
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PLAY
Take-up torque
1 Back tension
PLAY : l-W-21 11 A
F.FWD I REW : TW-2231
30-60 gr.cm
PLAY : T-W-21 11 A
1.5-4.5 gr.cm
55-120 gr.cm
55-120 ar.cm
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___
___
Tape tension
Drive-power cassette
l-W-241 2
60 gr or more
-8-
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D MECHANISM
24
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