Panasonic SAAK-22 Service manual

saak22pc.html

Table Of Contents

COVER 1 Safety Precaution

1.1 Insulation Resistance Test 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 Main

Component Replacement Procedures

8.1 Disassembly and assembly main

unit

8.1.1 Checking for Panel, Main and

Deck P.C.B.

8.1.2 Checking for Power P.C.B.

8.1.3 For Live Troubleshooting

Procedure

8.2 Main Component Replacement

Procedures

8.3 Disassembly and assembly of the

Traverse Unit

8.4 Disassembly and assembly of the

Disc Tray

9 Self-Diagnostic Function

9.1 Self-diagnostic display

9.2 How to enter the Self-Diagnostic

Function

9.3 Cassette Mechanism Test (For

error code H01, H02, H03, F01, F02)

9.4 CD Mechanism Test (F15, F26,

F16, F17, F27, F28, F29, H15)

9.5 To clear all Error code

9.6 How to get out from Self-

Diagnostic function

9.7 Power Amplifier Failure (F61) 10 Description of Error Code

Service Manual

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ORDER NO. MD0101009C1

CD Stereo System

● SA-AK22

Colour

(S)... Silver Type

Area

(P)... U.S.A.

(PC)... Canada

TAPE SECTION :

SG2 MECHANISM SERIES

CD SECTION :

RAE0152Z-3 TRAVERSE DECK SERIES

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10.1 Error detection for Cassette

Mechanism block

10.2 Error detection for

CD/Changer block

10.3 Power Supply related error

detection

11 CD Test Mode Function

11.1 How to set CD test mode

11.2 CD Automatically Adjustment

result indication

12 Measurements and Adjustments

12.1 Cassette Deck Section

12.1.1 Tape Speed Adjustment (Deck

1/2)

12.1.2 Bias and Erase Voltage Check

12.1.3 Bias Frequency Adjustment

(Deck 1/2)

12.2 Tuner Section

12.2.1 AM-IF Alignment

12.3 Alignment Points 13 Illustration of IC’s, Transistors and

Diodes

14 Terminal Function of IC’s

14.1 IC701 (AN8885SBE1) Servo

Amplifier

14.2 IC702 (MN662790RSC) Servo processor/ Digital signal processor/ Digital filter/

D/A converter

14.3 IC703 (AN8739SBE2) Focus coil/ Tracking coil/ Traverse

motor/ Spindle motor driver

14.4 IC600 (M38B79MFA053) System Microprocessor

15 Block Diagram 16 Schematic Diagram 17 Printed Circuit Board 18 Wiring Connection Diagram 19 Troubleshooting Guide 20 Parts Location and Replacement

Specifications

AMPLIFIER SECTION

Power output 10% Total harmonic distortion 70 Hz-16 kHz, both channels driven (LOW)

60 W per channel (6Ω)

Power output 10% Total harmonic distortion 1 kHz, both channels driven (HIGH)

70 W per channel (6Ω)

Input sensitivity AUX 250 mV Input Impedance AUX

13 kΩ

FM TUNER SECTION

Frequency range 87.9 - 107.9 MHz (200 kHz steps)

87.5 - 108.0 MHz (100 kHz steps) Sensitivity 2.5•V (IHF) S/N 26 dB 2.2•V Antenna terminal(s)

75Ω (unbalanced)

AM TUNER SECTION

Frequency range 520 - 1710 kHz (10 kHz steps) Sensitivity S/N 20 dB (at 1000 kHz) 560•V/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) HIGH (TYPE II) 35 Hz - 14 kHz S/N 50 dB (A weighted)

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Parts List

20.1 Deck Mechanism (RAA4501-S)

20.1.1 Deck Mechanism Parts

Location

20.1.2 Deck Mechanism Parts List

20.2 CD Loading Mechanism (RD-

DAC026-S)

20.2.1 CD Loading Mechanism Parts

Location

20.2.2 CD Loading Mechanism Parts

List

20.3 Cabinet

20.3.1 Cabinet Parts Location

20.3.2 Cabinet Parts List

20.4 Electrical Parts List

20.5 Packing Materials& Accessories

Parts List

20.6 Packaging

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 120 V, 60Hz Power consumption 155 W Dimensions (W x H x D) 250 x 332 x 316 mm

9 27/32” x 13 1/16” x 12 7/16” Mass (7.6 kg) 16.8 lb

SYSTEM

SC-AK22(P) Music Center: SA-AK22(P)

Speaker: SB-AK22(P)

SC-AK22(PC) Music Center: SA-AK22(PC)

Speaker: SB-AK22(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.

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1 Safety Precaution

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(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

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1.1 Insulation Resistance Test

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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 3 MΩ and 5.2 MΩ 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.

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2 Before Repair and Adjustment

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Disconnect AC power, discharge Power Supply Capacitors C536, C545 and C546 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 ~400mA.

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3 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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4 Accessories

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Remote Control Transmitter

FM indoor antenna

AC mains lead

AM Loop antenna

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5 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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6 Precaution of Laser Diode

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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.

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7 Operation Procedures

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8 Operation Checks 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.

● Main Component Replacement Procedures

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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.

8.1 Disassembly and assembly main unit

8.1.1 Checking for Panel, Main and Deck P.C.B.

8.1.2 Checking for Power P.C.B.

8.1.3 For Live Troubleshooting Procedure

8.2 Main Component Replacement Procedures

8.3 Disassembly and assembly of the Traverse Unit

8.4 Disassembly and assembly of the Disc Tray

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8.1 Disassembly and assembly main unit

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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).

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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

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

Step 2 : Remove the 2 screws.

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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.

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Separated front and rear panel assy.

Removal of Inner bracket.

Step 7 Remove 2 screws from bottom and 2 screw beside inner bracket to push forward to release the

front panel.

Step 8 To release inner bracket, remove 4 screws.

8.1.1 Checking for Panel, Main and Deck P.C.B.

8.1.2 Checking for Power P.C.B.

8.1.3 For Live Troubleshooting Procedure

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8.1.1 Checking for Panel, Main and Deck P.C.B.

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Step 1 Remove 2 screws each side.

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8.1.2 Checking for Power P.C.B.

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8.1.3 For Live Troubleshooting Procedure

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Step 6 : Reconnect all connectors.

Step 7 : Use extension 14pin FFC wire for CN309.

Step 8 : Supply power for troubleshooting.

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8.2 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.

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Note:

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

● 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 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 6 ).

Step 4 Remove the wires at CN302, CN303 and CN304 and pull out the Main P.C.B.

Step 5 Remove 4 screws fixed to the Power Amplifier IC.

Step6 Unsolder the terminals of Power Amp IC and replace the respective component.

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8.3 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 2.

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

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.

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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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