sa sa ak110pk Service Manual

CD Stereo System

SA-AK110P

Colour
(K)... Black Type

TAPE SECTION :
SG-2W MECHANISM SERIES

ORDER NO. MD0211231C1

A6

Specifications

■ AMPLIFIER SECTION

Power output
10% Total harmonic distortion
60Hz-16kHz, both channels driven

60 W per channel (6 Ω)
Power output
10% Total harmonic distortion
1kHz, both channels driven 80W per channel (6Ω)
Input sensitivity
AUX 250 mV
Input impedance
AUX 13.3kΩ

■ FM TUNER SECTION

Frequency range

87.9 - 107.9 MHz (200 kHz steps)

87.5 - 108.0 MHz (100 kHz steps)
Sensitivity 2.5µV (IHF)
S/N 26 dB 2.2 µV
Antenna terminal(s) 75 Ω (unbalanced)

■ AM TUNER SECTION

Frequency range 520 - 1710 kHz (10 kHz steps)
Sensitivity
S/N 20 dB (at 1000 kHz) 560 µV/m

■ CASSETTE DECK SECTION

Track system 4 track, 2 channel
Heads

Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC servo motor
Recording system AC bias 100 kHz
Erasing system AC erase 100 kHz
Tape speed 4.8 cm/s (1 7/8 ips)
Overall frequency response (+3 dB, -6 dB at DECK OUT)
NORMAL (TYPE I) 35 Hz - 14 kHz
S/N 50 dB (A weighted)
Wow and flutter 0.18 % (WRMS)
Fast forward and rewind time Approx. 120 seconds with

C-60 cassette tape

■ CD SECTION

Sampling frequency 44.1 kHz
Decoding 16 bit linear
Beam source/wave length Semiconductor laser/780 nm
Number of channels Stereo
Frequency response 20 Hz - 20 kHz (+1, -2 dB)
Wow and flutter Below measurable limit
Digital filter 8fs
D/A converter MASH (1 bit DAC)

■ GENERAL

Power supply AC 120 V, 60Hz
Power consumption 165 W
Power Consumption in standby

mode

0.34 W

© 2002 Matsushita Electronics (S) Pte. Ltd. All rights
reserved. Unauthorized copying and distribution is a
violation of law.

SA-AK110P /

Dimensions (W x H x D) 250 x 330 x 370 mm

(9 27/32” x 13” x 14 3/8 “)

Mass 7.0 kg (15.4 lb.)

■ SYSTEM

SC-AK110 (P) Music center: SA-AK110 (P)

Speaker: SB-AK110 (P)

Notes:

1. Specifications are subject to change without notice. Mass and
dimensions are aproximate.

2. Total harmonic distortion is measured by the digital spectrum
analyzer.

CONTENTS

Page Page

1 Safety Precaution
2 Before Repair and Adjustment
3 Protection Circuitry
4 Accessories
5 Handling Precautions For Traverse Deck
6 Precaution of Laser Diode
7 Operation Procedures
8 Operation Checks and Component Replacement Procedures
9 Self-Diagnostic Function
10 Descriptio n of Error Code

11 CD Test Mode Function

3
3

12 Measurements and Adjustments

4

13 Illustration of IC’s, Transistors and Diodes
14 Terminal Function of IC’s

4
5

15 Block Diagram

6

16 Schematic Diagram
17 Printed Circuit Board

7
8

18 Wiring Connection Diagram

35

19 Troubleshooting Guide
20 Parts Location and Replacement Parts List

36

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38
40
41
44
51
65
75
76
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1 Safety Precaution

(This “Safety Precaution” is applied only in U.S.A.)

1. Before servicing, unplug the power cord to prevent an electric shock.

2. When replacing parts, use only manufacturer’s recommended components for safety.

3. Check the condition of the power cord. Replace if wear or damage is evident.

4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.

5. 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.

1.1. Insulation Resistance Test

1. Unplug the power cord and short the two prongs of the plug
with a jumper wire.

2. Turn on the power switch.

3. 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.
Equipment with antenna terminals should read between

2.7MΩ and 3.9MΩ 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
chassis by design. These will read infinity.

4. If the measurement is outside the specified limits, there is a
possibility of a shock hazard. The equipment should be
repaired and rechecked before it is returned to the
customer.

Fig.1

Fig.2

2 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C520 and C540 through a 10Ω, 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 should be ~600mA.

3

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3 Protection Circuitry

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:

1. Turn off the power.

2. Determine the cause of the problem and correct it.

3. 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.

4 Accessories

Remote Control

Transmitter

FM indoor antenna

AC power supply cord

AM Loop antenna

4

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5 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)

•

1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock.

2. 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
work quickly.

3. Take care not to apply excessive stress to the flexible board (FFC).

4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.

Grounding for electrostatic breakdown prevention

•

1. Human body grounding

Use the anti-static wrist strap to discharge the static electricity from your body.

2. 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 laer diode against electroststics breakdown. Be sure to
remove the solder from the short point before making connections.

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6 Precaution of Laser Diode

CAUTION:

This unit utilizes a class 1 laser.
Invisible laser radiation is emitted from the optical pickup lens.
When the unit is turned on:

1. Do not look directly into the pick up lens.

2. Do not use optical instruments to look at the pick up lens.

3. Do not adjust the preset variable resistor on the pickup lens.

4. Do not disassemble the optical pick up unit.

5. If the optical pick up is replaced, use the manufacturer’s specified replacement pick up only.

6. 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 HAZARDOUS RADIATION EXPOSURE.

■ Use of caution label

6

7 Operation Procedures

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8 Operation Checks and Component Replacement

Procedures

“ATTENTION SERVICER”

Some chassis components may have sharp edges.
Be careful when disassembling and servicing.

This section describes procedures for checking the operation of the major printed circuit boards and replacing the

1.

main components.
For reassembly after operation checks or replacement, reverse the respective procedures.

2.

Special reassembly procedures are described only when required.
Select items from the following index when checks or replacement are required.

3.

Warning:

This product uses a laser diode. Refer to caution statement Precaution of Laser Diode.

8

8.1. Checking for Main P.C.B.

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Step 1 Remove 3 screws each side and 5 screws at rear panel.
Step 2 Lift up both sides of cabinet ass’y, push the cabinet

ass’y toward the rear and remove the cabinet ass’y.

• Checking the Main P.C.B. as shown below.

8.2. Disassembly for the CD changer ass’y

(The CD changer unit can be removed after the CD Lid is
removed)

• Follow the (Step 1) - (Step 2) of Item 8.1.

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 3 Press the OPEN/CLOSE button, the disc tray will be

open automatically.

8.2.1. Disassembly for the CD Lid

Step 4 Release the 2 claws, and then remove the CD Lid.

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Step 5 Press the POWER button to turn the power on.
Step 6 Press the OPEN/CLOSE button, the disc tray will be

close.

[Open the disc tray manually (Using service tools)]
Step 1 Upset the unit as shown below.

Step 3 Release the 2 claws, and then remove the CD lid cover.

Step 2 Insert the gear tool into the hole on the underside of CD

chasis and then rotate in the direction of arrow. The disc tray
will be open.

Step 4 Push the disc tray.

8.2.2. Disassembly for CD changer unit

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the Disassembly for the CD Lid of Item 8.2.1.

Step 1 Remove 2 screws at rear cabinet as show below.
Step 2 Lift up the mechanism unit cover, and then push in the

mechanism unit cover.
Step 3 Release the claws of both ends, and then lift up the CD

changer unit.

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Step 4 Upset the CD changer unit.
Step 5 Place the CD changer unit on the unit.

<The preparation of checking procedures in operational
condition is completed>

8.3. Checking for the unit operational condition

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(Place the unit horizontally when loading the CD changer unit.)

8.3.1. Initial setting of CD

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the Disassembly for the CD Lid of Item 8.2.1.

Step 1 Connect the AC power cord.
Step 2 Press POWER button to turn on power for main unit.
Step 3 Select the input select button to “CD”.

Step 5 Put the CD into the disc tray.

Step 4 Push the OPEN/CLOSE button, and then open the disc

tray.

Step 6 Press the OPEN/CLOSE button 1, and then close the

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disc tray. (Then, the CD will load.)

<The initial setting of CD unit is completed.>

8.3.2. Checking for the CD Servo P.C.B.,

Panel P.C.B., Deck P.C.B.,
Transformer P.C.B. and Power
P.C.B.

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the Disassembly for the CD Lid of Item 8.2.1.

• The initial setting of CD unit must be completed. (Refer to

the initial setting of CD unit in Item 8.3.1).

• Check for CD Servo P.C.B.

• The initial setting of CD unit must be completed. (Refer to

the initial setting of CD unit in item 8.3.1.)

Step 1 Push the power button and the power turns OFF.
Step 2 Remove the FFC boards.
Step 3 Remove the CD changer unit.

• Check the CD Servo P.C.B. as shown below
Step 6 Lay the unit.

Step 7 Connect the FFC board (19 pin) from CD servo P.C.B..
Step 1 Press the POWER button and the power turns off.
Step 2 Remove the connectors.
Step 3 Pull out the FFCs.
Step 4 Remove the CD changer unit.

Step 4 Remove 4 screws.

Step 5 Remove the mechanism unit cover.

Step 5 Lay the unit as shown below.

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Step 6 Remove 2 screws.
Step 7 Release the 2 claws, and then draw the front panel

ass’y.

• Check the Panel P.C.B., Deck P.C.B. and Transformer

P.C.B. as shown below

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• Checking the Power P.C.B. as shown below

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the (Step 1) - (Step 6) of Disassembly for the CD Lid

of Item 8.2.1.

• Follow the (Step 1) - (Step 8) of Checking for Panel
P.C.B.,Deck P.C.B., Transformer P.C.B. and Power P.C.B.
of Item 8.3.2.

Step 8 Release the 6 screws, and then remove the rear cover.

NOTE:

Insulate Power P.C.B. with insulation material to avoid short
circuit.

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8.3.3. Replacement of the Power
Amplifier IC

Checking the Power P.C.B.

•

• Follow the (Step 1) - (Step 2) of Item 8.1.

Step 1

Remove the 2 screws fixed to the Power Amplifier IC.

Step 4

Unsolder the terminals of Power Amp IC, transistor and

replace the component.

Step 2

Transistor Holders.

Step 3

Remove 2 screws fixed to the Power Amplifier IC and

Break the joint with a metal cutter as shown below.

Step 5

Fix back the bottom chasis with a screw as shown.

8.4. Main Component Replacement Procedures

8.4.1. Replacement of the Traverse Deck

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the (Step 1) - (Step 6) of Disassembly for the CD Lid

of Item 8.2.1.

• Follow the disassembly instruction for the CD changer unit

of Item 8.2.2.

Step 1

Push the power button and the power turns OFF.

14

Step 2
Step 3

Remove the FFC boards.
Remove the CD changer unit.

Step 4 Insert the gear with hexagonal wrench into the hole.

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Step 6 With pressing the claw (A), rotate the hexagonal wrench

clockwise. (The slide plate R moves for a little amount.)
Step 7 Pressing the claw (B) in the direction of arrow (1), the

connection lever moves in the direction of arrow (2).

Step 8 Lift up the traverse deck ass’y.

Step 5 Rotate the hexagonal wrench in the direction of arrow

(clockwise), and then open the disc tray fully.

Step 9 Remove the traverse deck ass’y from the timing lever.
Caution:

When removing or inserting the traverse deck avoid touching
the OPU lens and pressing onto the turntable.

Step 10 Remove 3 screws.
Step 11 Unsolder the motor terminals (4 points).

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Note:

Be careful not to lose the 3 floating spring because those will
also be removed on removal of the traverse deck ass’y.

Step 12 Remove the FFC board from the connector, and then
remove the CD Servo P.C.B.

Step 13 Remove the pin.

Step 14 Release the claw, and then remove the traverse deck

ass’y.

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• 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.

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Step 3 Force the claw of timing lever.

• Note for installation of the CD servo P.C.B.

• Installation for traverse deck ass’y

Step 4 Force the disc tray fully.

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 5 With pressing the claw (B) in the direction of arrow (1),
force the connection lever in the direction of arrow (2).

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8.5. Replacement for the disc tray

• Follow the (Step 1) - (Step 2) of Item 8.1

• Follow the Disassembly for the CD Lid of Item 8.2.1.

• Follow the Disassembly for the CD Changer Unit of Item

8.2.2.

• Follow the (Step 1) - (Step 8) of Item 8.4

Step 1 Remove 4 screws.

Step 6 Insert the gear with hexagonal wrench into the hole.

Step 2 Remove the upper plate.
Step 3 Remove 3 screws.

Step 4 With lifting the claw in the direction of (1), draw the

clamp SW P.C.B. in the direction of arrow (2).

Step 5 Remove the mechanism cover.

Step 7 Rotate the hexagonal wrench in the direction of arrow,

and then open the disc tray fully.

Step 8 Release the both claws, and then draw the disc tray.

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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.

NOTE:

Force the right guide bar of tray base manually not to move
upwards.

Step 4 Holding the disc tray manually, push the disc tray in the
direction of the arrow.

Step 2 Holding the drive rack not to move, install the disc tray.
Step 3 Align the drive rack with the drive gear.

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8.6. Disassembly and reassembly for mechanism base drive unit

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the Disassembly for the CD Lid of Item 8.2.1.

• Follow the Disassembly for the CD changer unit of Item

8.2.2.

• Follow the (Step 1) - (Step 14) of Item 8.4

• Follow the (Step 1) - (Step 9) of Item 8.5

Step 1 Remove 3 screws.

Step 5 Release the 2 claws, and then remove the bottom SW

P.C.B..

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 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.

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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 9 Pressing the claw (B) in the direction of arrow (1), force
the connection lever in the direction of arrow (2).

Step 10 Move the slide plate 1 to the end of stock side.

Step 12 Remove slide plate 1 and slide plate 2.

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Step 13 Remove the traverse relay gear, traverse cam gear

and drive gear.

Step 3 Rotate the disc lever in the direction of arrow (1), draw
the disc lever.

[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.

NOTE:

Take care not to lose the disc lever spring.

Step 4 Release the 2 claws, and then draw the relay gear B.
Step 5 Release the 2 claws as shown below.

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NOTE:

Hold the loading stopper ass’y manually bacause it is flipped by
spring.

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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 6 Remove the cushion spring.
Step 7 Remove the loading stopper ass’y in the direction of

arrow.

Step 10 Remove the lower spindle spring with tweezers.

Step 11 Force the lower hook with thin tip of minus screwdriver.

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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.)

Step 2 Lower the loading stopper ass’y, and then align the
lower spindle with the trapezoid tooth of relay gear A.

Step 12 Squeeze the shaft of lower hook, and then draw it.

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 3 Force the loading stopper ass’y, latch the claw firmly.

Step 15 Rotate the UP/DOWN base at a 90° angle. Then,

[Reassembly for mechanism base drive unit]

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Step 1 Install the traverse cam gear.
Step 2 Rotate the traverse cam gear to the direction of arrow.

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Step 3 Install the drive gear and traverse relay gear.

*When installing the traverse relay gear, align the trapezoid
tooth of gear with tooth of traverse cam gear.

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 6 Install the spindle base unit. (First, slide plate 1.)

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Step 7 Move the slide plate 1 to forward fully.
Step 8 Install the rear lock. (The claw should be latched.)
Step 9 Install the bottom SW P.C.B.. (The claw should be

latched.)

Step 10 Install the tray lock. (The claw should be latched.)

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).

Step 13 Install the gear holder, and then tighten the screw (a).

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8.7. Replacement for the motor ass’y

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the Disassembly for the CD Lid of Item 8.2.1.

• Follow the Disassembly for the CD changer unit of Item

8.2.2.

• Follow the (Step 1) - (Step 8) of Item 8.4

• Follow the (Step 1) - (Step 7) of Item 8.5

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Step 14 Install the tray base, traverse ass’y, mechanism cover

and upper plate.
[Operation check after servicing]
Check the proper operation of following items with gear and

hexagonal screwdriver.

1. Open/close of tray base.

2. Moving the tray base to the stock side.

3. UP/DOWN operation of spindle base unit.

4. UP/DOWN operation of traverse ass’y.

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.

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.

Step 7 Release the claw (B), and then remove the motor ass’y.
[Notice for motor ass’y installation]

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1. Locate the name plate of motor to the traverse ass’y.

2. Align the hole of motor with the ribs.

8.8. Replacement for the pinch roller ass’y and head block

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the Disassembly for the CD Lid of Item 8.2.1.

• Follow the disassembly for the CD changer unit of Item

8.2.2.

• Follow the (Step 1) - (Step 14) of Item 8.4

Step 1 Remove the connector.

Step 2 Remove 2 screws.
Step 3 Remove the 2 claws, and then draw the front panel

ass’y.

Step 4 Pull out the FFC.
Step 5 Remove the flat cable from the connector.
Step 6 Push the lever upward, and then open the cassette lid

ass’y (For DECK1 and DECK2).

Step 7 Remove the flat cable from the connector (CN1001).
Step 8 Remove the 5 screw.

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Step 9 Tilt the cassette mechanism in the direction of arrow (1),
and then remove it in the direction of arrow (2).

Step 10 Unsolder the motor terminals.
Step 11 Remove 4 screws.
Step 12 Remove mechanism Deck P.C.B.
* The mechanism as shown below is for DECK1. For the

one of DECK 2, perform the same procedures.

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Step 13 Release the 2 claws, and then remove the pinch roller

(R), (F).
Step 14 Release ther 2 claws, and then remove the head

connector.

Step 15 Remove 2 screws.

8.9. Replacement for the CD motor ass’y, capstan belt A, capstan belt B
and winding belt

• Follow the (Step 1) - (Step 2) of Item 8.1.

• Follow the Disassembly for the CD Lid of Item 8.2.1.

• Follow the Disassembly for the CD changer unit of Item

8.2.2.

• Follow the (Step 1) - (Step 14) of Item 8.4

• Follow the (Step 1) - (Step 11) of Item 8.9

Step 1 Release the 2 claws, and then remove the head
connector.

Step 2 Remove 6 screws.
Step 3 Remove the sub chassis.

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