Panasonic SCTM-22 Service manual
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1 Safety Precaution
1.1 Insulation Resistance Test
(This “Safety Precaution” is applied only in U.S.A.)
Before servicing, unplug the power cord to prevent an electric
shock.
When replacing parts, use only manufacturer’s recommended
components for safety.
Check the condition of the power cord. Replace if wear or
damage is evident.
After servicing, be sure to restore the lead dress, insulation
barriers, insulation papers, shields, etc.
Before returning the serviced equipment to the customer, be
sure to make the following insulation resistance test to
prevent the customer from being exposed to a shock
hazard.
Unplug the power cord and short the two prongs of the plug
with a jumper wire.
Turn on the power switch.
Measure the resistance value with ohmmeter between the jumper
AC plug and each exposed metal cabinet part, such as
screwheads, antenna, control shafts, handle brackets, etc.Measure
the resistance value with ohmmeter between the jumper AC
plugand each exposed metal cabinet part, such as screwheads,
antenna, control shafts, handle brackets, etc.
Equipment with antenna terminals should read between 2.7M and
3.9M to all exposed parts*. ( Fig.1 )
Equipment without antenna terminals should read approximately
infinity to all exposed parts. ( Fig.2 )
*Note : Some exposed parts may be isolated from the chassisby
design. These will read infinity.
If the measurement is outside the specified limits, there is a
possibility of a shock hazard. The equipment should be
repaired and re-checked before it is returned to the
customer.
Fig.1
Fig.2
2 Before Repair and
4 Prevention of Electr o
Adjustment
Disconnect AC power, discharge Power Supply Capacitors C520
and C540 through a 10˜, 5W resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver
blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a
variac, to avoid overcurrent.
Current consumption at AC 120V, 60 Hz in NO SIGNAL mode
(volume min at CD mode) should be ~600mA.
3 Protection Cir cuitry
The protection circuitry may have operated if either of the
following conditions are noticed:
• No sound is heard when the power is turned on.
• Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for
example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the
indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
Turn off the power.
Static Discharge (ESD) to
Electrostatically Sensitive
(ES) Devices
Some semiconductor (solid state) devices can be damaged easily
by electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistorsand
semiconductor “chip” components. The following techniques
should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
Immediately before handling any semiconductor component
or semiconductor-equiped assembly, drain off any ESD
on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging ESD wrist strap, whichshould be removed
for potential shock reasons prior to applying power to the
unit under test.
After removing an electrical assembly equiped with ES
devices, place the assembly on a conductive surface such
as aluminium foil, to prevent electrostatic charge build up
or exposure of the assembly.
Use only a grounded-tip soldering iron to solder or unsolder
ES devices.
Use only an anti-static solder remover device. Some solder
removal devices not classified as “anti-static (ESD
protected)” can generate electrical charge to damage ES
devices.
Determine the cause of the problem and correct it.
Turn on the power once again after one minute.
Note :
When the protection circuitry functions, the unit will not operate
unless the power is first turned off and then on again.
Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
Do not remove a replacement ES device from its protective
package until immediately before you are ready to install
it. (Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam,
aluminium foil orcomparable conductive material).
Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material to
the chassis or circuit assembly into which the device will be
installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. Minimize body motions
when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your
clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient todamage an
ES device).
5 Handling the Lead-free
Solder
5.1 About lead free solder (PbF)
Distinction of PbF P.C.B.:
P.C.B.s (manufactured) using lead free solder will have a PbF
stamp on the P.C.B.
Caution:
• Pb free solder has a higher melting point than standard
solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher.
Please use a high temperature soldering iron. In case of soldering
iron with temperature control,please set it to 700 ± 20°F (370 ±
10°C).
• Pb free solder will tend to splash when heated too high
(about 1100°F/600°C).
• When soldering or unsoldering, please completely
remove all of the solder on the pins or solder area, and be sure to
heat the soldering points with the Pb free solder until it melts
enough.
6 Handling Precautions For
Traverse Deck
The laser diode in the traverse deck (optical pickup) may break
down due to potential difference caused by static electricity of
clothes or human body.
So, be careful of electrostatic breakdown during repair of the
traverse deck (optical pickup).
• Handling of traverse deck (optical pickup)
Do not subject the traverse deck (optical pickup) to static
electricity as it is extremely sensitive to electrical shock.
The short land between the No.4(LD) and No.5(GND) pins on
the flexible board (FFC) is shorted with a solder build-up
to prevent damage to the laser diode.To connect to the PC
board, be sure to open by removing the solder build-up,
and finishthe workquickly.
Take care not to apply excessive stress to the flexible board
(FFC).
Do not turn the variable resistor (laser power adjustment). It
has already been adjusted.
Fig 6.1
Grounding for electrostatic breakdown prevention
Human body grounding
7 Precaution of Laser
Use the anti-static wrist strap to discharge the static
electricity from your body.
Work table grounding
Put a conductive material (sheet) or steel sheet on the
area where the traverse deck (optical pickup) is placed,
and ground the sheet.
Caution :
The static electricity of your clothes will not be grounded through
the wrist strap. So, take care not to let your clothes touch the
traverse deck (optical pickup).
Caution when Replacing the Traverse Deck :
The traverse deck has a short point shorted with solder to protect
the laser diode against electroststics breakdown. Be sure to
remove the solder from the short point before making
connections.
Fig 6.2
Diode
CAUTION:
This unit utilizes a class 1 laser.
Invisible laser radiation is emitted from the optical pickup lens.
Wavelength: 780nm.
When the unit is turned on:
Do not look directly into the pick up lens.
Do not use optical instruments to look at the pick up lens.
Do not adjust the preset variable resistor on the pickup lens.
Do not disassemble the optical pick up unit.
If the optical pick up is replaced, use the manufacturer’s
specified replacement pick up only.
Use of control or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
CAUTION!
THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF
PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY
RESULT IN HAZARDOUSRADIATION EXPOSURE.
Use of caution label
8 Accessories
Remote Control Transmitter
( EUR7710020)
FM Indoor Antenna
(N1EAYY000004)
9 Operacion procedures
( see next page )
AC Power Supply Cord
( SJA168-1A )
AM Loop Antenna
( N1DADYY00002 )
10 Disassembly and
10.2 Disassembly of Top Cabinet
Assembly of Main
Component
10.1 Disassembly flow chart
The following chart is the procedure for disassembling the casing
and inside parts for internal inspection when carrying out the
servicing.
To assemble the unit, reverse the steps shown in the chart as
below.
and Rear Panel
Step 1 Remove 3 screws on each side and 5 screws at rear panel.
Step 2 Lift up both sides of top cabinet, push the cabinet ass’y
toward the rear and remove it.
Disassembly of Rear Panel
Step 3 Remove 6 screws.
Step 4 Draw rear panel backward to remove it.
10.2.1 Disassembly for CD Lid
(The CD changer unit can be removed after the CD Lid is
removed)
• Follow the (Step 1) - (Step 5) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
When opening the disc tray automatically (Using Power Supply)
Step 1 Connect the AC power cord.
Step 2 Press the POWER button to power up the main unit.
Step 5 Press the OPEN/CLOSE button, the disc tray will close.
[Open the disc tray manually (Using service tools)]
Step 3 Press the OPEN/CLOSE button, the disc tray will open
automatically.
Step 1 Insert the gear tool into the hole on the underside of CD
chassis and then rotate in the direction of arrow. The disc tray will
be open.
Step 4 Release the 2 claws, and then remove the CD Lid.
Step 2 Release the 2 claws, and then remove the CD lid cover.
10.3 Disassembly of CD Mechanism
Unit
• Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
Step 1 Detach the FFC boards (CN309 & CN310).
Step 3 Repeat Step 2 but rotate the gear tools in anti-clockwise
direction.
Step 2 Release the claws of both ends, and then lift up the CD
Mechanism Unit.
Step 4 The disc tray will be close.
Step 3 Remove 4 screws.
Step 4 Remove the CD chassis.
Step 5 Lay the CD mechanism unit as shown.
• Note:
For disassembly of CD mechanism unit, please refer to
Section 10.7 of this manual.
Step 2 Lift up Main P.C.B. by disconnect CN500 & CN501 as
arrow shown above.
10.4 Disassembly Main P.C.B.,
Transformer P.C.B.& Power P.C.B.
10.4.1 Disassembly for the Main
P.C.B.
• Follow the (Step 1) - (Step 4) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly
of the CD Mechanism Unit
Step 1 Disconnect FFC boards at CN303, CN302 & CN304 .
10.4.2 Disassembly of the
Transformer P.C.B.
• Follow the (Step 1) - (Step 4) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly
of the CD Mechanism Unit
Step 1 Remove 3 screws.
Step 2 Disconnect connector CN950.
10.4.3 Disassembly of the Power
P.C.B.
• Follow the (Step 1) - (Step 4) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly
of the CD Mechanism Unit
• Follow the (Step 1) - (Step 2) of Item 10.4.1 Disassembly for the Main P.C.B.
Step 1 Remove 2 screws.
Step 2 Remove the 2 screws fixed at heat sink.
Step 2 Break the joint with a metal cutter as shown below.
Step 3 Unsolder the terminals of Power Amp IC, transistor and
replace the components.
NOTE:
Insulate Power P.C.B. with insulation material to avoid short
circuit.
• Replacement of Power Amplifier IC & Voltage Regulator
Step 1 Remove 2 screws (For Power Amp IC) and 1 screw (For
Voltage Regulator) .
Step 4 Fix back the cutted portion with a screw as shown.
10.5 Disassembly of Panel P.C.B.&
Tact Switch P.C.B.
• Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 5) of Item 10.3 - Disassembly
of the CD Mechanism Unit
• Disassembly of Panel P.C.B.
Step 1 Lay the unit as shown below.
• Step 6 Pull out the volume knob.
Step 7 Pull Panel P.C.B. forward.
10.6 Disassembly of Deck
Step 2 Remove 2 screws, release 2 claws, and then draw the front
panel ass’y forward.
Mechanism Unit& Deck P.C.B.
• Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly
of the CD Mechanism Unit
Step 1 Detach FFC board. (CN971)
Step 2 Disconnect FFC flat cable from the connector (CN1001).
Step 3 Remove the 5 screws.
Step 3 Remove the 8 screws.
Step 4 Disconnect FFC board (CN302).
• Disassambly of Tact Switch P.C.B.
Step 5 Disconnect connector CN900.
Step 4 Push the lever upward, and then open the cassette lid ass’y
(For DECK1 and DECK2).
Step 5 Tilt the cassette mechanism unit in the direction of arrow
(1), and then remove it in the direction of arrow (2).
10.7 CD Mechanism Main
Component Replacement
Procedures
• Follow the (Step 1) - (Step 4) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 5) of Item 10.3 - Disassembly
of the CD Mechanism Unit
10.7.1 Replacement of the Traverse
Deck
For replacement of Deck P.C.B.
Step 1 Remove the CD changer unit.
Step 6 Unsolder the motor terminals.
Step 7 Remove 3 screws.
Step 8 Remove Deck P.C.B.
Step 2 Insert the gear with hexagonal wrench into the hole.
Step 7 Remove the traverse deck ass’y from the timing lever.
Caution:
Step 3 Rotate the hexagonal wrench in the direction of arrow
(clockwise), and then open the disc tray fully.
Step 4 With pressing the claw (A), rotate the hexagonal wrench
clockwise. (The slide plate R moves for a little amount.)
Step 5 Pressing the claw (B) in the direction of arrow (1), the
connection lever moves in the direction of arrow (2).
When removing or inserting the traverse deck avoid touching the
OPU lens and pressing onto the turntable
Step 8 Remove 3 screws.
Step 9 Unsolder the motor terminals (4 points).
Step 6 Lift up the traverse deck ass’y.
Step 10 Remove the FFC board from the connector, and then
remove the CD Servo P.C.B.
Step 11 Remove the pin.
Note for installation of the CD servo P.C.B.
Step 12 Release the claw, and then remove the traverse deck ass’y.
Note:
Be careful not to lose the 3 floating spring because those will also
be removed on removal of the traverse deck ass’y.
• Installation of the CD Servo P.C.B. after replacement
Step 1 Connect the FFC board.
Step 2 Install the CD servo P.C.B. in the traverse deck ass’y.
Step 3 Remove 3 screws.
Step 4 Solder.
Installation for traverse deck ass’y
Step 1 Install the traverse deck ass’y to the timing lever.
Step 2 Align the boss of traverse deck ass’y with the slot of
traverse cam gear.
Step 3 Force the claw of timing lever.
10.7.2 Replacement for the Disc
Tray
Step 1 Remove 4 screws
Step 2 Remove the upper plate.
Step 4 Force the disc tray fully.
Step 3 Remove 3 screws.
Step 4 With lifting the claw in the direction of (1), draw the CD
Detect P.C.B. in the direction of arrow (2).
Step 5 Remove the mechanism cover.
Step 5 With pressing the claw (B) in the direction of arrow (1),
force the connection lever in the direction of arrow (2).
Step 6 Insert the gear with hexagonal wrench into the hole
Step 7 Rotate the hexagonal wrench in the direction of arrow, and
then open the disc tray fully.
Step 9 With forcing the left guide bar manually because the left
guide bar interfers with claw, draw the disc tray.
[Installation of the disc tray after replacement]
Step 1 Slide the drive rack fully in the direction of arrow.
Step 8 Release the both claws, and then draw the disc tray.
Step 2 Holding the drive rack not to move, install the disc tray.
Step 3 Align the drive rack with the drive gear.
NOTE:
Force the right guide bar of tray base manually not to move
upwards.
10.7.3 Disassembly and reassembly
for mechanism base drive unit
Step 1 Remove 3 screws.
Step 4 Holding the disc tray manually, push the disc tray in the
direction of the arrow.
Step 2 Release the claw, and then remove the gear holder.
Step 3 Remove the belt and change gear spring.
NOTE:
Take care not to lose the change gear spring.
Step 4 Remove the pulley gear, change gear and UP/DOWN gear.
Step 5 Release the 2 claws, and then remove the bottom SW
P.C.B..
Step 9 Pressing the claw (B) in the direction of arrow (1), force
the connection lever in the direction of arrow (2).
Step 6 Install the tray lock spring to hook temporary.
Step 7 Release the claw, and then remove the tray lock.
Step 8 Release the claw, and then remove the rear lock.
Step 10 Move the slide plate 1 to the end of stock side.
Step 11 Lift up the left end of spindle base unit in the direction of
arrow (1), and then remove the unit in the direction of arrow (2).
Step 13 Remove the traverse relay gear, traverse cam gear and
drive gear.
Step 12 Remove slide plate 1 and slide plate 2.
[Dissassembly/reassembly for the spindle base unit]
Step 1 Draw the 5 disc spacers.
Step 2 Pushing the claw, slide the support plate in the direction of
arrow, and then remove it.
Step 4 Release the 2 claws, and then draw the relay gear B.
Step 5 Release the 2 claws as shown below.
NOTE:
Step 3 Rotate the disc lever in the direction of arrow (1), draw the
disc lever.
NOTE:
Take care not to lose the disc lever spring.
Hold the loading stopper ass’y manually bacause it is flipped by
spring.
Step 6 Remove the cushion spring.
Step 7 Remove the loading stopper ass’y in the direction of arrow.
Step 8 Release the 2 claws, and then remove the relay gear A.
Step 9 Release the 2 claws, and then remove the spindle shaft.
Step 12 Squeeze the shaft of lower hook, and then draw it.
Step 10 Remove the lower spindle spring with tweezers.
Step 11 Force the lower hook with thin tip of minus screwdriver.
Step 13 Rotate the lower spindle in the direction of arrow until
the lower spindle interferes with stopper.
Step 14 Insert the thin tip of minus screwdriver between the lower
spindle and UP/DOWN base, and then slacken the lower spindle
to release the stopper. Then, rotate the lower spindle and remove
it.
Step 15 Rotate the UP/DOWN base at a 90° angle. Then, spread
the hold bars of loading stopper and remove the UP/DOWN base.
[Installation for loading stopper ass’y]
Step 1 Align the claw of loading stoppers ass’y with the slot of
spindle base. (Caution should be exercised when alignment of
claw due to the size of claws.)
[Reassembly for mechanism base drive unit]
Step 1 Install the traverse cam gear.
Step 2 Rotate the traverse cam gear to the direction of arrow.
Step 2 Lower the loading stopper ass’y, and then align the lower
spindle with the trapezoid tooth of relay gear A.
Step 3 Force the loading stopper ass’y, latch the claw firmly.
Step 3 Install the drive gear and traverse relay gear.
Step 7 Move the slide plate 1 to forward fully.
Step 4 Install the slide plate 2 to the mechanism base, and then
match to the connection lever.
Step 5 Install the slide plate 1 to the mechanism base, and then
match to the connection leve and align the trapezoid tooth of
traverse relay gear with the slide plate 1.
Step 8 Install the rear lock. (The claw should be latched.)
Step 9 Install the Spindle Position P.C.B.. (The claw should be
latched.)
Step 10 Install the tray lock. (The claw should be latched.)
Step 6 Install the spindle base unit. (First, slide plate 1.)
Step 11 Remove the tray lock spring from hook,and then latch to
the tray lock.
Step 12 Install the UP/DOWN gear, change gear, change gear
spring, pulley gear and belt in the order of (1) - (5).
10.7.4 Replacement for the motor
ass’y
Step 13 Install the gear holder, and then tighten the screw (a).
Step 14 Install the tray base, traverse ass’y, mechanism cover and
upper plate.
Step 1 Install the belt temporarily.
NOTE:
Take care not apply the grease to the belt.
Step 2 Upset the CD loading unit.
Step 3 Remove 3 screws.
[Operation check after servicing]
Check the proper operation of following items with gear and
hexagonal screwdriver.
Open/close of tray base.
Moving the tray base to the stock side.
UP/DOWN operation of spindle base unit.
UP/DOWN operation of traverse ass’y.
Step 4 Unsolder the plunger terminals (2 points).
Step 5 Unsolder the motor terminals (2 points).
Step 6 Release the 2 claws (A), and then remove the Motor P.C.B.
10.8 Replacement for the pinch
roller ass’y and head block
• Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly
of the CD Mechanism Unit
• Follow the (Step 1) of Item 10.4 - Disassembly the Main
P.C.B. & Transformer P.C.B.
• Follow the (Step 1) - (Step 2) of Item 10.5 - Disassembly
of the Panel P.C.B. & Tact Switch P.C.B.
• Follow the (Step 1) - (Step 5) of Item 10.6 - Disassembly
for the Deck Mechanism Unit & Deck P.C.B.
Step 7 Release the claw (B), and then remove the motor ass’y.
[Notice for motor ass’y installation]
Locate the name plate of motor to the traverse ass’y.
Align the hole of motor with the ribs.
* The mechanism as shown below is for DECK1. For the one of
DECK 2, perform the same procedures.
Step 1 Release the 2 claws, and then remove the pinch roller (R),
(F).
Step 2 Release ther 2 claws, and then remove the head connector.
Step 3 Remove 2 screws.
10.9 Replacement for the
Deck motor ass’y, capstan
belt A, capstan belt B and
winding belt
• Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly
of Top Cabinet and Rear Panel
• Follow the (Step 1) - (Step 5) of Item 10.2.1 Disassembly for CD Lid
• Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly
of the CD Mechanism Unit
• Follow the (Step 1) of Item 10.4 - Disassembly the Main
P.C.B. & Transformer P.C.B.
• Follow the (Step 1) - (Step 2) of Item 10.5 - Disassembly
of the Panel P.C.B. & Tact Switch P.C.B.
• Follow the (Step 1) - (Step 5) of Item 10.6 - Disassembly
for the Deck Mechanism P.C.B.
Step 1 Release the 2 claws, and then remove the head connector.
Step 4 Remove 3 screws.
Step 2 De-solder plunger point.
Step 3 Remove the Deck Mechanism P.C.B.
Step 5 Remove the flywheel R.
Step 6 Release the claw of tape side, and then remove the winding
lever and spring.
Step 7 Remove the flywheel F.
[Installation of the belt]
Step 1 The boss and marking should be positioned horizontally.
Step 2 Put the winding belt on the pulley temporarily.
Step 3 Install the flywheel F.
Step 4 Put the winding belt on the flywheel F.
Step 5 Install the winding lever and spring while pressing the
winding arm in the direction of arrow.
Step 7 Put the capstan belt A temporarily as shown below.
Step 6 Install the flywheel R.
Step 8 Put the capstan belt B on the motor ass’y pulley.
Step 9 Install the sub chassis to the mechanism, and then tighten
screws.
Step 10 Remove 3 screws.
Step 11 Put the capstan belt B as shown below.
Step 12 Put the capstan belt A on the motor ass’y pulley.
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