Panasonic SAAK-52 Service manual

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Table Of Contents

COVER

1 Before Repair and Adjustment

2 Protection Circuitry

3 Accessories

4 Handling Precautions For Traverse Deck

5 Precaution of Laser Diode

6 Operation Procedures

7 Disassembly and Main Component Replacement Procedures

7.1 Disassembly Procedure For Each Major P.C.B. Checking

7.1.1 Checking of the Main, Transformer, Panel and Deck P.C.B.

7.1.2 Checking of the Power P.C.B.

7.2 Main Component Replacement Procedures

7.3 Disassembly and assembly of the Traverse Unit

7.4 Disassembly and assembly of the Disc Tray

8 Self-Diagnostic Function

8.1 Self-diagnostic display

8.2 How to enter the Self-Diagnostic Function

8.3 Cassette Mechanism Test (For error code H01, H02, H03, F01, F02)

8.4 CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29, H15)

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8.5 To clear all Error code

8.6 How to get out from Self-Diagnostic function

8.7 Power Amplifier Failure (F61)

9 Description of Error Code

9.1 Error detection for Cassette Mechanism block

9.2 Error detection for CD/Changer block

9.3 Power Supply related error detection

10 CD Test Mode Function

10.1 How to set CD test mode

10.2 CD Automatically Adjustment result indication

11 Measurements and Adjustments

11.1 Cassette Deck Section

11.1.1 Head Azimuth Adjustment (Deck 1/2)

11.1.2 Tape Speed Adjustment (Deck 1/2)

11.1.3 Bias and Erase Voltage Check

11.1.4 Bias Frequency Adjustment (Deck 1/2)

11.2 Tuner Section

11.2.1 AM-IF Alignment

11.3 Alignment Points

12 Illustration of IC’s, Transistors and Diodes

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13 Terminal Function of IC’s

13.1 IC701 (AN8885SBE1) Servo Amplifier

13.2 IC702 (MN662790RSC) Servo Processor, Digital Signal Processor, Digital Filter, D/A Converter

13.3 IC703 (AN8739SBE2) Focus Coil, Tracking Coil, Traverse Motor, Spindle Motor Drive

13.4 IC600 (M38B79MFA158) Microprocessor

14 Block Diagram

15 Schematic Diagram

16 Printed Circuit Board

17 Wiring Connection Diagram

18 Troubleshooting Guide

19 Parts Location and Replacement Parts List

19.1 Deck Mechanism (RAA3408)

19.1.1 Deck Mechanism Parts Location

19.1.2 Deck Mechanism Parts List

19.2 CD Loading Mechanism (RD-DAC026-S)

19.2.1 CD Loading Mechanism Parts Location

19.2.2 CD Loading Mechanism Parts List

19.3 Cabinet

19.3.1 Cabinet Parts Location

19.3.2 Cabinet Parts List

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19.4 Electrical Parts List

19.5 Packing Materials& Accessories Parts List

19.6 Packaging

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Service Manual

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ORDER NO. MD0104079C2

CD Stereo System

● SA-AK52EE

Colour

(S)... Silver Type

Area

(EE)... Russian& Ukraine

TAPE SECTION :

AR2 MECHANISM SERIES

CD SECTION :

RAE0152Z-3 TRAVERSE DECK SERIES

Specifications

AMPLIFIER SECTION

Power output THD 10% 80Hz, both channels driven (LOW)

115 W per channel (6Ω)

1 kHz, both channels driven (High)

45 W per channel (6Ω)

Total Bi-Amp Power 160W per channel

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Input sensitivity AUX 250 mV Input Impedance AUX

13 kΩ

FM TUNER SECTION

Frequency range 87.50 - 108.00 MHz (50 kHz steps) Antenna terminal(s)

75Ω (unbalanced)

AM TUNER SECTION

Frequency range 522 - 1629 kHz (9 kHz steps) Sensitivity S/N 20 dB (at 999 kHz)

560μV/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

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

Power supply AC 230 - 240 V, 50Hz Power consumption 185 W Power consumption in standby mode

0.4 W Dimensions (W x H x D) 250 X 332 X 316mm Mass 8.5 kg

SYSTEM

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

Speaker: SB-AK52(GC)

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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.

3. The label“HIGH” and“LOW” on the rear of the speakers refer to High frequency and Low frequency.

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1 Before Repair and Adjustment

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Disconnect AC power, discharge Power Supply Capacitors C531, C532, C533, C534 and C579 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 230, 50 Hz in NO SIGNAL mode should be ~400mA.

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2 Protection Circuitry

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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.

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3 Accessories

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Remote Control Transmitter

FM indoor antenna

AC mains lead

AM Loop antenna

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4 Handling Precautions For Traverse Deck

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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 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.

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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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5 Precaution of Laser Diode

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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 frompick 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 :100 μW/VDE/DieStrahlung 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.

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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

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6 Operation Procedures

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7 Disassembly and Main Component Replacement Procedures

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“ATTENTION SERVICER”

Some chassis components may have sharp edges.

Be careful when disassembling and servicing.

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

replacing the main components.

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

Special reassembly procedures are described only when required.

3. 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.

2. Checking of the Power P.C.B.

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● 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.

7.1 Disassembly Procedure For Each Major P.C.B. Checking

7.1.1 Checking of the Main, Transformer, Panel and Deck P.C.B.

7.1.2 Checking of the Power P.C.B.

7.2 Main Component Replacement Procedures

7.3 Disassembly and assembly of the Traverse Unit

7.4 Disassembly and assembly of the Disc Tray

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7.1 Disassembly Procedure For Each Major P.C. B. Checking

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7.1.1 Checking of the Main, Transformer, Panel and Deck P.C.B.

7.1.2 Checking of the Power P.C.B.

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7.1.1 Checking of the Main, Transformer, Panel and Deck P.C.B.

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Step 2 Remove the top cabinet.

Step 3 Remove the T-bracket.

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Step 5 Turn locating pin on both sides 90°. (Locating pin need not to be bent back.)

Step 6 Release the wires CN302, CN303, CN304, CN309 and CN502. Remove rear panel by pulling

it backward and lift the rear panel assembly.

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Step 7 Use a hexagonal wrench and turn clockwise to release the tray.

Step 8 Pull the CD tray in the direction shown above.

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Step 9 Remove the CD lid in the direction of the arrow.

Step 11 Release the two catches shown above to remove the front cabinet from the CD traverse unit.

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Step 12 Connect back the wire to CN302, CN303 and CN304. Use the extension wire (REXX0261)

to connect to CN502. Use a FFC wire (REEX0137) to connect CN1 to CN309.

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7.1.2 Checking of the Power P.C.B.

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7.2 Main Component Replacement Procedures

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1. Replacement of the Traverse Deck

Step 1 Follow the procedures in ‘Disassembly of the Traverse Unit’ ( Step 1 - Step 4 )

Step 3 Desolder the 4 legs of the 2 motors and pull out the Servo P.C.B.

Step 4 Widen the 3 bosses with a flat screwdriver and pull out the 3 pins. Then remove the Traverse Deck.

Step 5 Remove the flexible cable CN 701.

● Removal of the flexible cable. Push the top of the connector in the direction of the arrow 1, and then pull out the flexible cable in the

direction of the arrow 2.

Note:

Insert a short pin into the flexible cable for traverse unit.

● Installation of the CD servo P.C.B. after replacement

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Step 1 Connect the FFC board.

Step 2 Install the CD servo P.C.B. in the traverse deck assembly.

Note:

Before installing the CD servo P.C.B., move the optical pickup towards the outer edge from the marking (black triangle). [Otherwise, the reset detect switch (S701) mounted on the CD servo P.C.B. may be damaged.]

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2. Replacement of the Power Amplifier IC

Step 1 Follow the procedures in ‘Checking Procedure for each major P.C.B.’ ( Step 1 - Step 4 ).

Step 2 Remove the wires at CN302, CN303 and CN304 and pull out the Main P.C.B.

Step 3 Remove 4 screws fixed to the Power Amplifier IC.

Step 4 Unsolder the terminals of Power Amp IC and replace the respective component.

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7.3 Disassembly and assembly of the Traverse Unit

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Step 1 Push the lever from position A to B.

Step 2 Pull the stopper (black) in the direction of arrow 1 and push the lever in the direction of arrow

Step 3 Push the stpeer (black) down until the white lever eject out.

Step 4 Lift up the traverse unit and slide out the unit as shown.

● Replacement of Traverse Unit

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Step 1 Place the traverse unit as shown.

Step 2 Press in the lever shaft in the direction of arrow 1 as shown and push the traverse unit into the

position in the direction of arrow 2.

Step 3 Pull the stopper in the direction of arrow 1 and release the lever in the direction of arrow 2 as

shown.

Step 4 Pull out the tray half way and push it back fully.

Step 5 Push the lever to the initial position indicated ‘I---I’.

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