Funai MCD-338 Service manual
MCD-338
SERVICE MANUAL
Contents
Safety precautions ---------------------------- 1- 2
Preventing static electricity ----------------- 1- 3
Important for laser products ---------------- 1- 4
Disassembly method ------------------------ 1- 5
Adjustment method -------------------------- 1- 17
Flow of functional
operation until TOC read -------------- 1- 19
Maintenance of laser pickup -------------- 1- 20
Replacement of laser pickup -------------- 1- 20
Description of major ICs ------------------- 1- 21
Safety Precautions
1. This design of this product contains special hardware and many circuits and components specially for
safety purposes. For continued protection, no changes should be made to the original design unless
authorized in writing by the manufacturer. Replacement parts must be identical to those used in the
original circuits. Services should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the
product should not be made. Any design alterations or additions will void the manufacturer's warranty
and will further relieve the manufacture of responsibility for personal injury or property damage
resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them
necessarily be obtained by using replacement components rated for higher voltage, wattage, etc.
Replacement parts which have these special safety characteristics are identified in the Parts List of
Service Manual. Electrical components having such features are identified by shading on the
schematics and by ( ! ) on the Parts List in the Service Manual. The use of a substitute replacement
which does not have the same safety characteristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention
of electric shock and fire hazard. When service is required, the original lead routing and dress should
be observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the
product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.)
to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation
transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the
leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part
having a return path to the chassis, to a known good earth ground. Any leakage current must not
exceed 0.5mA AC (r.m.s.)
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or
more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F ACtype capacitor between an exposed metal part
and a known good earth ground. Measure the AC
voltage across the resistor with the AC voltmeter.
Move the resistor connection to each exposed
metal part, particularly any exposed metal part
having a return path to the chassis, and meausre
the AC voltage across the resistor. Now, reverse
the plug in the AC outlet and repeat each
measurement. Voltage measured Any must not
exceed 0.75 V AC(r.m.s.). This corresponds to 0.5
mA AC(r.m.s.).
0.15 F AC TYPE
1500 10W
AC VOLTMETER
(Having 1000
ohms/v
olts,
or more sensitivity)
Place this
probe on
each exposed
metal part.
Good earth ground
Warning
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
!
CAUTION
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
1-2
Preventing static electricity
1. Grounding to prevent damage by static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is
discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when
performing repairs.
2. About the earth processing for the destruction prevention by static electricity
In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity
of the work environment.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it
before placing the traverse unit (optical pickup) on it.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
3. Handling the optical pickup
1. In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power
source can easily destroy the laser diode.
4. Handling the CD changer unit (optical pickup)
1. Do not subject the CD changer unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procedure in the text.
Remove the anti-static pin when replacing the CD changer
unit. Be careful not to take too long a time when attaching it
CD changer
unit
to the connector.
3. Handle the flexible cable carefully as it may break when
subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that
adjusts the laser power. Do not turn it.
Attention when traverse unit is decomposed
Please refer to “Disassembly method” in the text for
*
pick up and how to detach the CD changer mechanism.
1. Remove the CD changer unit.
2. Disconnect the harness from connector on the CD motor
board.
3. Solder is put up before the card wire is removed from connector
Cn601on the main board as shown in Fig.1 and Fig. 2.
(When the wire is removed without putting up solder, the
CD pick-up assembly might destroy.)
4. Please remove solder after connecting the card wire with
CN601 when you install picking up in the substrate.
Flexible cable
Fig.1
Soldering
Fig.2
1-3
Important for laser products
1. CLASS 1 LASER PRODUCT
2. DANGER :
lock failed or defeated. Avoid direct exposure to beam.
3. CAUTION :
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4. CAUTION :
laser radiation and is equipped with safety switches
which prevent emission of radiation when the drawer is
open and the safety interlocks have failed or are
defeated. It is dangerous to defeat the safety switches.
Invisible laser radiation when open and inter
There are no serviceable parts inside the
The compact disc player uses invisible
5. CAUTION : If safety switches malfunction, the laser is able
to function.
6. CAUTION :
of procedures other than those specified herein may
result in hazardous radiation exposure.
!
CAUTION Please use enough caution not
Use of controls, adjustments or performance
to see the beam directly or touch
it in case of an adjustment or
operation check.
FUSE CAUTION
CAUTION:
REPLACE WITH SAME TYPE
AND RATING FUSE (S).
ATTENTION:
REMPLACER PAR UN(LES)
FUSIBLE(S) DE MEME TYPE
ET DE MEME VALEUR
1-4
Disassembly method
Commence disassembly of the set by removing the main units and then proceed to the components
and assemblies inside the units.
Replacement of the fuses and the power IC
Top cover
CD changer unit
Front panel assembly
Chassis unit
CD changer unit
Removing the main PCB
Removing the CD changer mechanism assembly
Removing the CD pickup
Replacing the loading motor and belt of the CD changer tray
Replacing the CD tray rotor belt of CD changer, and removing the motor
Front panel assembly
Removing the cassette deck mechanism
Removing the earphone jack PCB
Removing the control/FL PCB
Removing the cassette deck main motor, and replacing the main belts
Removing the leaf switches of the cassette deck mechanism
Removing the cassette deck heads
Chassis unit
Removing the 3-pin regulator
Removing the power amp and supply PCB and the Power Trans PCB
Removing the sub power PCB
1-5
<Disassembly of the main blocks of the set>
Replacement of the fuses and the power IC
Replacing the fuses (See Fig.1)
Prior to performing the following procedure, remove
the left side BOARD.
1. Replace the fuses inside.
Replacing the heat sink cover (See Fig.3)
1. Remove four screws B from the rear panel.
2. Pull the heat sink cover outward.
[Caution]
Be sure to use fuses with the specified
ratings.
Fuse (F951)
Fuse (F953)
T1.6AL 250V
T3.15AL 250V
Fuse (F952)
T1.6AL 250V
Fig.1
Replacing the power IC (See Fig.2)
Prior to performing the following procedure, remove
the top cover.
1. Remove the two screws A from the heat sink between
the power IC.
2. Remove the solder fixing the power IC.
B
MCD-338
Fig.3
1-6
W
Fig.2
A
Removing the top cover
(See Fig.4 and 5)
1. Remove six screws C that retain the top cover from
the panel rear of the body.
2.
Remove six screws D that retain the top cover from
the two sides of the body.
3. Remove the top cover from the body by lifting it
toward the rear.
MCD-338
Fig.4
Right Front panel assembly
D
Left Front panel assembly
D
D D
Fig.5
1-7
Removing the CD changer unit
(See Fig.6 to 9)
Prior to performing the following procedures, remove
the top cover.
[Caution]
Although the CD mechanism unit can be
removed without removing the CD tray
panel, it is still recommended to remove it
in order to prevent damage.
a. From the front panel side of this set, push in the
sections marked with arrows and pull out the CD
tray toward the front.
b. Remove the CD tray panel by pushing both of
its extremities upward in the direction of the
arrows.
c. Push the CD tray deep into the set.
1. Disconnect the cord wires from the main PCB
CN403, CN201, CN601, CN401, CN402, and CN205.
2. From the rear of the set, remove two screws E, two
screws F and four screws G on the front panel left
and right side.
3. Handle the CD changer unit rear, take out the unit.
CD tray panel
Fig.7
MCD-338
E
Antenna
terminal
F
CD tray panel
Fig.8
G
Fig.6
1-8
Fig.9
Removing the front panel assembly
(See Fig.10 to 11)
Prior to performing the following procedures, remove
the top cover.
Also remove the CD changer unit.
1. Disconnect the parallel wire and the cord wire from
the connectors J1, CN202 on the power AMP PCB.
2. Remove one screws H retaining the front panel
assembly onto the bottom of the body.
3. Remove two screws I on the left and right side of the set
retaining the panel front from the bottom and then
remove then GND lug b that comes from the power
amp and supply PCB.
4. Disengage the claws c on both sides of the front
panel assembly and then remove the assembly.
H
Fig.10
GND lug
a
Fig.11
GND lug
Screw
I
b
Claw
c
1-9
<Disassembly of units and assembly
inside this set>
Removing the MAIN PCB
(See Fig.12 to 13)
Prior to performing the following procedures, remove
the top cover.
Also remove the CD changer unit.
1. Disconnect the wires from CN702, CN703 on the
main PCB, which is located on the back side of the
CD changer unit.
2. The four screws J that retain the CD PCB should
be removed.
3. Remove the CD PCB by pulling it toward the side
where the CN701 is located.
4. Using solder, short the CD pickup to connect to
short round.
J
PAIN PCB
J
Fig.12
J
[Caution]
After re-connecting the wires, be sure to
remove the shorting solder from the GND
connection.
5. Disconnect the card wire from the connector CN701
on the main PCB and then remove the main PCB.
CD PCB
CN701
1-10
Short round
Fig.13
Removing the CD changer mechanism
assembly (See Fig.14 to 15)
Prior to performing the following procedures, remove
the top cover.
Also remove the CD changer unit.
1. Turn the CD changer mechanism cover base and
remove the screws d connecting the unit to the CD
changer mechanism assembly.
2. Removing four screws e retaining the CD mechanism
holder assembly.
CD changer
unit
[Caution]
CD changer
mechanism
assemb
ly
When replacing the CD changer mechanism
assembly, be sure not to mistake the positions
of the silver color and copper color spring.
e
e
( Green color )
( Red color )
d
Fig.14
e
( Green color )
Fig.15
e
( Red color )
1-11
Removing the CD pickup (See Fig.16)
Prior to performing the following procedures, remove
the top cover.
Also remove the CD changer unit.
Also remove the CD changer mechanism.
1. Widen the section f.
2. While keeping the section f wide open, push the
section g in the direction of the arrow to remove
the shaft, and then remove the CD pickup.
Replacing the loading motor and rotor
belt of the CD changer (See Fig .17)
Prior to performing the following procedures, remove
the top cover.
Also open the CD changer tray.
CD pickup
f
Shaft
g
1. Remove the two screws L retaining the CD changer
tray loading motor.
2. Remove the two screws M retaining the gear plate
and take it out, after remove the rotor belt from the
pulley.
Replacing the CD turn table and removing the motor (See Fig. 19 )
Prior to performing the following procedures, remove
the top cover.
Also remove the CD changer unit.
N
1. Remove the one screws
table).
2. Remove the two screws O retaining the stopper
brackets on both sides of the CD changer unit.
3. Remove the stopper brackets from both sides of
the CD changer unit.
4. Pull out the CD tray from the CD changer unit, all
the way and lift the tray (u/~ ward) to remove.
5. Remove the gear and after push out the tray motor
locker and pull out the tray motor from the CD tray.
retaining the CD (Turn
Fig.16
M
L
Fig.17
1-12
Turn table motor
, and then remove the CD tray
Motor locker
Obligue gear
Fig.18
Removing the cassette deck mechanism
(See Fig.19)
Prior to performing the following procedures, remove
the top cover.
Also remove the CD changer unit.
Also remove the front panel assembly.
1. Remove six screws Z retaining the cassette deck
mechanism.
Removing the key PCB
(See Fig.20 to 22)
Prior to performing the following procedures, remove
the top cover.
Also remove the CD changer unit.
Also remove the front panel assembly.
Z
Z
Fig.19
Front panel assembly
1. Remove the volume knob from front cabinet
that retains the key PCB.
L1
2. Remove FIFTEEN screws
.
3. Remove Two screws L2 from the USB PCB.
key PCB
L1
Volume knob
Fig.20
Front panel
assembly
Volume
shaft
Fig.21
Fig.22
L2
1-13
Removing the cassette deck main motor,
and replacing the main belts
(See Fig.19, 23 and 24)
Prior to performing the following procedures, remove
the top cover and both sides board.
Also remove the CD changer unit.
Also remove the front panel assembly.
1. Remove six screws Z retaining the cassette deck
mechanism. (Fig.19)
2. Remove the cassette deck mechanism.
3. Remove two screws t retaining the main motor from
the front side of the cassette deck.
Cassette deck mechanism
(Front side)
t
Fig.23
[Caution]
After attaching the main motor, check the
orientation of the motor and the polarity of
the wires.
4. From the backside of the cassette deck, remove the
main motor and two main belts.
[Caution]
The lengths of the cassette A(playback
only) and cassette B(record/play) main
belts are different. When attaching the main
belts, use the longer belt for cassette A.
Removing the leaf switches of the cassette
deck mechanism (See Fig. 19 and 25)
Prior to performing the following procedures, remove
the top cover and both sides board.
Also remove the CD changer unit.
Also remove the front panel assembly.
Cassette deck mechanism
(Back side)
Main belt
(For B cassette)
Fig.24
Solder side of leaf switch
Cassette deck main motor
Main belt
(For A cassette)
1. Remove the six screws Z that retain the cassette
deck mechanism. (Fig.19)
2. Remove the cassette deck mechanism.
3. Turn the cassette deck mechanism upside down.
4. Remove the solder from around the leaf switches.
5. Pull out the leaf switches from the front side of the
cassette deck mechanism.
1-14
Cassette deck mechanism
(Back side)
Fig.25
Removing the cassette deck heads
(See Fig. 19 and 26)
Prior to performing the following procedures, remove
the top cover and both sides board.
Also remove the CD changer unit.
Also remove the front panel assembly.
1. Remove six screws Z that retain the cassette deck
mechanism. (Fig.19)
2. Remove the cassette deck mechanism and place
it so that the front side faces up.
3. Remove the solder from the bottom side of the
head terminal and disconnect the wire.
4. Remove screws U that retains the head.
5. Remove screws V that retains the head.
6. Hold the head and slide it in the direction of the
arrow to remove it.
PB Head
Cassette deck mechanism
(Front side)
V
U
Fig.26
VU
REC/PB Head
Removing the 3-pin regulator and bridge
diode
(See Q604, Q608, D614, D615 and Fig.27)
Prior to performing the following procedures, remove
the top cover and both sides board.
A
1. Remove two screws
2. Remove two screws W that connect the heat sink.
3. Remove the solder fixing the the 3-pin terminal regulator
Q604, Q608.
4. Remove the solder fixing the 4-pin bridge diode
(D614, D615).
that connect the heat sink.
W
Fig.27
A
1-15
Removing the power amp and supply PCB
and the power trans PCB
(See Fig. 2, 28 to 30)
Prior to performing the following procedures, remove
the top cover and CD changer unit.
1. Remove four screws B from the rear panel. (Fig.3)
2. Pull the heat sink cover outward.
3. Remove four screws
the heat sink holder.
4. Remove four screws
and then remove the rear panel.
5. Disconnect the parallel wires from the connectors
FW951 on the power trans PCB.
6. Remove screws Z that retain the power amp and
supply PCB and then remove the assembly.
7. Remove the
clamp of AC power cord from the chassis.
8. Remove four screws that retain the power trans PCB
and then remove the assembly.
AA
from the rear panel between
YY
that retains the rear panel,
Top cover
AA
MCD-338
C
Fuse (F953)
T1.6AL 250V
YY
Clamp
Fig.30
Fuse (F951)
T3.15AL 250V
Fuse (F952)
T1.6AL 250V
Fig.28
1-16
Chassis
Z
Fig.29
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1-17
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1-20
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