■ AMPLIFIER SECTION (GC area)

PMPO 1400 W

RMS power output

THD 10%, both channels driven 70 W per channel (6 Ω)

Input sensitivity

AUX 250 mV

MIC 0.7 mV

Input Impedance

AUX 13.9 kΩ

MIC 680 Ω

■ AMPLIFIER SECTION (GN area)

RMS power output

THD 10%, both channels driven 60 W per channel (6 Ω)

Input sensitivity

AUX 250 mV

Input Impedance

AUX 13.9 kΩ

■ FM TUNER SECTION

Frequency range 87.5 - 108 MHz (50 kHz steps)

Sensitivity 2.5 µV (IHF)

S/N 26 dB 2.2 µV

Antenna terminal(s) 75 Ω (unbalanced)

© 2000 Matsushita Electronics (S) Pte Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.

SA-AK18

Colour

(S)... Silver Type

Area

(GC)...Asia, Latin America, Africa and Middle Near East

(GN)...Oceania

TAPE SECTION :

AR2 MECHANISM SERIES

CD SECTION :

RAE0152Z-3 TRAVERSE DECK SERIES

■ AM TUNER SECTION (GC area)

Frequency range

MW 522 - 1629 kHz (9 kHz steps)

520 - 1630 kHz (10 kHz steps)

SW 3.200 - 7.350 MHz (0.005 MHz steps)

9.400 - 21.750 MHz (0.005 MHz steps)

Sensitivity

MW

S/N 20 dB (at 999 kHz) 560 µV/m

SW

S/N 20 dB (at 5.3 MHz) 35.5 µV/m

■ AM TUNER SECTION (GN area)

Frequency range 522 - 1629 kHz (9 kHz steps)

Sensitivity

S/N 20 dB (at 999 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

CD Stereo System

Specifications

ORDER NO. MD0004055C3

Recording system AC bias 100 kHz

Erasing system AC erase 100 kHz

Tape speed 4.8 cm/s

Frequency response (+3 dB, -6 dB at DECK OUT)

NORMAL (TYPE I) 35 Hz - 14 kHz

HIGH (TYPE II) 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 8 fs

D/A converter MASH (1 bit DAC)

■ GENERAL (GC area)

Power supply AC 110 V/127 V/220 V/230-240V, 50/60 Hz

Power consumption 155 W

1 Before Repair and Adjustment 3

2 Protection Circuitry 3

3 Accessories 3

4 Handling Precautions For Traverse Deck 4

5 Precaution of Laser Diode 4

6 Operation Procedures 6

7 Operation Checks and Main Component Replacement

Procedures 8

8 Self-Diagnostic Function 15

9 Description of Error Code 16

Power consumption in standby mode

Eco mode on 0.8 W

Eco mode off 12 W

Dimensions (W x H x D) 270 x 330 x 310 mm

Weight 7.4 kg

■ GENERAL (GN area)

Power supply AC 230-240V, 50 Hz

Power consumption 152 W

Power consumption in standby mode

Eco mode on 0.4 W

Eco mode off 12 W

Dimensions (W x H x D) 270 x 330 x 310 mm

Weight 6.9 kg

■ SYSTEM

SC-AK18 (GC) Music Center: SA-AK18 (GC)

Speaker: SB-AK18 (GC)

SC-AK18 (GN) Music Center: SA-AK18 (GN)

Speaker: SB-AK18 (GC)

Notes:

1. Specifiacations are subject to change without notice. Weight and dimensions are approximate.

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

10 CD Test Mode Function 17

11 Measurements and Adjustments 17

12 Illustration of IC’s, Transistors and Diodes 21

13 Terminal Function of ICs 22

14 Block Diagram 25

15 Schematic Diagram 33

16 Printed Circuit Board 60

17 Wiring Connection Diagram 73

18 Troubleshooting Guide 74

19 Parts Location and Replacement Parts List 75

CONTENTS Page Page

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3 Accessories

Remote Control Transmitter

FM indoor antenna

AC mains lead (GC)

AC mains lead (GN)

Power plug adapter (GC)

AM Loop antenna

1 Before Repair and Adjustment Disconnect AC power, discharge Power Supply Capacitors C536, C545, C546, C548 and C555 through a 10 Ω, 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.

For GC

Current consumption at AC 110 V, 240 V, 50 Hz in NO SIGNAL mode should be ~620mA ,~300mA respectively.

For GN

Current consumption at AC 240 V, 50 Hz in NO SIGNAL mode should be ~200mA.

2 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.

3

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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 finish the work quickly.

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

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 laser diode against electrostatics breakdown. Be sure to remove the solder from the short point before making connections.

4 Handling Precautions For Traverse Deck

5 Precaution of Laser Diode Caution :

This product utilizes a laser diode with the unit turned "ON", invisible laser radiation is emitted from the pick up lens. Wavelength : 780 nm Maximum output radiation power from pick up : 100 µW/VDE Laser radiation from pick up unit is safety level, but be sure the followings:

1. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous.

2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.

3. Do not look at the focus lens using optical instruments.

4. Recommend not to look at pick up lens for a long time.

ACHTUNG :

Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheit abgestrahlt. Wellenlänge : 780nm

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SA-AK18

■ Use of Caution Labels

Maximale Strahlungsleistung der Lasereinheit :100W/VDE Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte beachtet werden:

1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist.

2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.

3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.

4. Nicht über längere Zeit in die Fokussierlinse blicken.

ADVARSEL: I dette a apparat anvendes laser.

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.

5

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6 Operation Procedures

6

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7

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Some chassis components may have sharp edges.

Be careful when disassembling and servicing.

• Main Component Replacement Procedures

7.1.1. Checking of the Main, Panel, Deck and Po