Panasonic SA-AK52 User manual

■AMPLIFIER SECTION

PMPO 2300 W

RMS power output

THD 10%, both channels driven

80 Hz, both channel driven

(Low channel) 100 W per channel (6 Ω)

1 kHz, both channel driven

(High channel) 40 W per channel (6 Ω)

Total Bi-Amp power 140 W per channel

Input sensitivity

AUX 250 mV

MIC 0.7 mV

Input Impedance

AUX 13 kΩ

MIC 680 Ω

■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)

■AM TUNER SECTION

Frequency range

MW 522 - 1629 kHz (9 kHz steps)

520 - 1630 kHz (10 kHz steps)

reserved. Unauthorized copying and distribution is a

violation of law.

SA-AK52

Colour

(S)... Silver Type

Area

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

TAPE SECTION :

AR2 MECHANISM SERIES

CD SECTION :

RAE0152Z-3 TRAVERSE DECK SERIES

SW 3.200 - 7.350 MHz (0.005 MHz

steps)

9.400 - 21.750 MHz (0.005 MHz

steps)

Sensitivity

S/N 20 dB (at 999 kHz) 560 µV/m

S/N 20 dB (at 5.3 MHz) 35.5 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

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

CD Stereo System

Specifications

ORDER NO. MD0101010C3

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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 110 V/127 V/220 V/230-240V,

50/60 Hz

Power consumption 180 W

1 Before Use 3

2 Before Repair and Adjustment 3

3 Protection Circuitry 3

4 Accessories 3

5 Handling Precautions For Traverse Deck 4

6 Precaution of Laser Diode 5

7 Operation Procedures 6

8 Operation Checks and Main Component Replacement

Procedures 8

9 Self-Diagnostic Function 18

10 Description of Error Code 19

Power consumption in standby mode

0.8 W

Dimensions (W x H x D) 250 x 332 x 316 mm

Mass 9.0 kg

■SYSTEM

SC-AK52(GC) Music Center: SA-AK52(GC)

Speaker: SB-AK52(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.

3.The labels “High” and “Low” on the rear of the speakers refer to

High frequency and Low frequency.

11 CD Test Mode Function 20

12 Measurements and Adjustments 20

13 Illustration of IC’s, Transistors and Diodes 24

14 Terminal Function of ICs 25

15 Block Diagram 28

16 Schematic Diagram 34

17 Printed Circuit Board 48

18 Wiring Connection Diagram 58

19 Troubleshooting Guide 59

20 Parts Location and Replacement Parts List 60

CONTENTS

Page Page

SA-AK52

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4 Accessories

Remote Control

Transmitter

FM indoor antenna

AC mains lead

Power plug adapter

AM Loop antenna

1 Before Use

Be sure to disconnect the mains cord before adjusting the voltage selector.

Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will

be used. (If the power supply in your area is 117V or 120V, set to the “127V” position.)

Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,

the correct voltage is already set.)

2 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C531, C532, C533, C534, C579 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.

Current consumption at AC 110 V, 60 Hz in NO SIGNAL mode should be ~650mA respectively.

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.

SA-AK52

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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.

5 Handling Precautions For Traverse Deck

SA-AK52

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6 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

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.

■Use of Caution Labels

SA-AK52

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7 Operation Procedures

SA-AK52

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Some chassis components may have sharp edges.

Be careful when disassembling and servicing.

8 Operation Checks and Main Component Replacement

Procedures

“ATTENTION SERVICER”

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

main components.

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

Special reassembly procedures are described only when required.

Select items from the following index when checks or replacement are required.

Contents

• Disassembly and assembly main unit

1.Checking of the Main, Panel, Deck and Power P.C.B.

• Main Component Replacement Procedures

1.Replacement of the Traverse Deck.

2.Replacement of the Power Amplifier IC.

• Disassembly and assembly of the Traverse Unit

• Disassembly and assembly of the Disc Tray

Warning:

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

ACHTUNG:

Die Lasereinheit nicht zerlegen.

Die Lasereinheit darf nur gegen eine vom Hertsteller spezifizierte Einheit ausgetauscht werden.

SA-AK52

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Step 1 Remove 3 screws each side and 5 screws at rear panel.

Step 2 Remove the Top Cabinet

Step 3 Remove T-bracket.

Step 4 Remove 2 screws each side of the inner chassis and a

screw at the rear panel. Turn locating pin 90°.

(Locating pin need not have to be bent back).

Step 5 Release the wires CN 300, 301, 302, 304 and 309.

Remove rear panel by pulling backward and lift rear panel assy

off.

Remove Front Panel

8.1. Disassembly and assembly main unit

SA-AK52

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Step 1 : Use a hexagonal wrench and turn clockwise to release

the tray.

Step 2 : Remove the 2 screws.

Step 3 : Push the CD tray in the direction shown above.

Step 4 : Remove the CD lid in the direction of the arrow.

Step 5 : Release the two catches shown above to remove the

front cabinet from the CD Traverse Unit.

Separated front and rear panel assy.

Removal of Inner bracket.

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