Panasonic SA-AK22 User Manual

ORDER NO. MD010100 9C1

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

Specifications

■ AMPLIFIER SECTION

Power output 10% Total harmonic distortion 70 Hz-16 kHz, both channels driven (LOW) 60 W per channel (6 Ω) Power output 10% Total harmonic distortion 1 kHz, both channels driven (HIGH) 70 W per channel (6 Ω) 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 µV (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 Frequency response (+3 dB, -6 dB at DECK OUT) 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 8fs

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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.

CONTENTS

Page Page

1 Safety Precaution 3 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 9 Self-Diagnostic Function 10 Descriptio n of Error Code

11 CD Test Mode Function 12 Measurem ents and Adjustments

4 4

13 Illustration of IC’s, Transistors and Diodes

14 Terminal Function of IC’s 15 Block Diagram

5 6

16 Schematic Diagram

17 Printed Circuit Board 18 Wiring Connection Diagram

19 Troubleshooting Guide

20 Parts Location and Replacement Parts List

21 21 24 25 28 34 47 57 58 59

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 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

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.

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 mains lead

AM Loop antenna

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 finish the 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.

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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.

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

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.

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8.1. Disassembly and assembly main unit

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

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

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

the tray.

Step 2 : Remove the 2 screws.

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

front cabinet from the CD Traverse Unit.

Separated front and rear panel assy.

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

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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.

Step 1 Remove 2 screws each side.

8.1.2. Checking for Power P.C.B.

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8.1.3. For Live Troubleshooting Procedure

Step 6 Step 7 Step 8

: Reconnect all connectors. : Use extension 14pin FFC wire for CN309. : Supply power for troubleshooting.

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8.2. Main Component Replacement Procedures

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

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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Step6 Unsolder the terminals of Power Amp IC and replace the

respective component.

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.

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8.3. Disassembly and assembly of the Traverse Unit

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

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.

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’.

8.4. Disassembly and assembly of the Disc Tray

Step 5 Rotate the hexagonal wrench in the direction of arrow

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

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Step 2 With lifting the claw in the direction of arrow 1, draw the

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

Step 3 Remove the mechanism cover.

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

Step 6 Upset the CD changer unit again. Step 7 Release both the claws, and then draw the disc tray.

Step 8 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

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Step 1 Slide the drive rack fully in the direction of arrow.

Step 4 Holding the disc tray manually, rotate the pulley gear in

the direction of arrow. Step 5 Rotate the gear 5 or 6 times manually, and then push

the disc tray.

Step 2 Holding the drive rack not to move, install the disc tray.

Step 3 Align the drive rack with the driver gear.

9 Self-Diagnostic Function

9.1. Self-diagnostic display

This unit is equipped with a self-diagnostic display function which, if a problem occurs, will display an error code corresponding to the problem.

Use this function when performing maintenance on the unit.

9.2. How to enter the Self-Diagnostic Function

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

1. Press “TAPE, DECK 1/2” to select Deck 2.

2. Load a cassette tape with the erasure prevention tab, remove from left side only and close the cassette holder.

3. Press “FAST FORWARD MEMORY” (Tape will be stop after 2 seconds)

4. Load a cassette tape with the erasure prevention tab, remove from right side only and close the cassette holder.

5. Press “REVERSE FM MODE/BP” (Tape will be stop after 2 seconds)

6. Load a pre-recorded tape with both side record tabs intact and close the cassette holder.

7. Press “PLAY/TUNE/TIME ADJ UP” (After TPS function, tape will stop automatically)

8. Press “REC/STOP” (Tape will not move)

9. Press “STOP/TUNE MODE” to indicate Error code.

• If several problem exist, error code will change each time when “■ /TUNE MODE” is pressed.

(e.g. H01 → H03 → F01 .....etc.)

10. Press “TAPE, DECK 1/2” to select Deck 1.

11. Repeat step 2 to 9 to test Deck 1. (Tape Deck 1 will not check H02 because of no recording function)

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

1. Press “CD”.

2. Press “OPEN/CLOSE (1)” and place a CD.

3. Press “OPEN/CLOSE (1)” to close the tray.

4. Press “OPEN/CLOSE (5)” and wait until the tray is open.

5. Press “OPEN/CLOSE (1)” and remove the CD.

6. Press “OPEN/CLOSE (1)” to close the tray.

7. Press “■/TUNE MODE” to indicate Error Code.

• If several problem exist, error code will change each time when “■/TUNE MODE” is pressed. (e.g. F15 → F26 → F16 ....etc).

9.5. To clear all Error code

1. Press “STOP/TUNE MODE” button for 5 seconds.

2. FL indicator shows “CLEAR” for 1 second and change to “T”.

9.6. How to get out from Self-Diagnostic function

1. Press “Power” button OFF.

9.7. Power Amplifier Failure (F61)

1. When power amplifier fail, F61 will indicate automatically.

10 Description of Error Code

10.1. Error detection for Cassette Mechanism block

No. Error Error

1 MODE SW

detection error

2 REC INH SW

detection error

3 HALF SW

detection error

4 Reel Pulse

detection error

5 TPS abnormal F02 Cassette deck will not perform TPS function.

Display

H01 Faulty operation of cassette mechanism.

H02 Recording not possible.

H03 Playback cannot perform.

F01 The tape advances slightly and then stops.

10.2. Error detection for CD/Changer block

No. Error Error

1 REST SW detection error F15 CD does not function.

2 CD tray opens automatically F16 CLAMP switch (S4) NG (Check & Replace) 3 Does not startup when [PLAY]

button is pressed

4 Transmission error between CD

servo LSI and micon

5 Startup fails even when you

insert CD or the selected disc tray

does not open 6 Cannot insert CD F28 Tray 1 detect switch NG (Check & Replace) 7 Cannot eject CD F29 Check if disc is stuck. Tray 2 detect switch NG (Confirm & Replace) 8 The CD tray closes H15 CD disc tray detect switch NG (S3) (Check & Replace)

Display

F17 BOTTOM switch (S5) NG (Check & Replace)

F26 CD does not function.

F27 Tray 1 detect switch or Tray 2 detect switch NG (Check & Replace)

Problem condition

Faulty contact or short-circuit of mechanism mode switch (S951, S971).

Faulty contact or short-circuit of REC INH switch (S974, S975).

Faulty contact or short-circuit of HALF siwtch (S952, S972).

Faulty reel pulse, faulty hole detect IC (IC951, IC971).

Faulty playback EQ/recording amplifier IC (IC101).

Problem condition

This error occurs when the Optical Pick Up REST SW (S701) is not detected within the specified time (about 8 seconds)

This error occurs when the POWER is ON for the CD block and an error is detected after the transmission has started.

10.3. Power Supply related error detection

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No. Error Error

1 POWER AMP

output abnormal

Display

F61 When POWER is switched on, power become off automatically.

Problem condition

During normal operation, if DC DET become L, PCNT shall become L and the error display on the left shall be displayed. (IC501)

11 CD Test Mode Function

This CD test mode is provided to check CD unit withou t connec ting to changer loading mechanism. This mode shall operat e CD PLAY with CD unit being connected only and CD Autom atic Alignment result is shown on FL display.

11.1. How to set CD test mode

11.2. CD Automatically Adjustment result indication

Under CD test mode, pressing the numeric key ‘0’ on the remote controller will display the auto adjustment result. FLOCK, TLOCK and CLVS status shall be shown as below:

During the above display, executing CD PLAY will display auto adjustment result for CD PLAY mode.

12 Measurements and Adjustments

12.1. Cassette Deck Section

• Measurement Condition

− Tape edit: NORMAL

− Record timer: OFF

− Make sure head, capstan and press roller are clean.

− Judgeable room temperature 20 ± 5 °C (68 ± 9°F)

• Measuring instrument

− EVM (Electronic Volmeter)

− Digital quency counter

• Test Tape

− Tape speed gain adjustment (3 kHz, -10 dB);

QZZCWAT

12.1.1. Tape Speed Adjustment (Deck 1/2)

1. Set the tape edit button to “NORMAL” position.

2. Insert the test tape (QZZCWAT) to DECK 2 and playback (FWD side) the middle portion of it.

3. Adjust Motor VR (DECK 2) for the output value shown below.

Adjustment target: 2940~3060 Hz (NORMALspeed)

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4. After alignment, assure that the output frequency of the DECK 1 FWD are within ±60 Hz of the value of the output frequency of DECK 2 FWD.

12.1.3. Bias Frequency Adjustment (Deck 1/2)

12.1.2. Bias and Erase Voltage Check

1. Set the unit “AUX” position.

2. Insert the Normal blank tape (QZZCRA) into DECK 2 and the unit to “REC” mode (use “● REC/STOP” key).

3. Measure and make sure that the output is within the standard value.

Bias voltage for Deck 2 14 ± 4mV (Normal) Standard value) Erase voltage for Deck 2 more than 80mV (Normal)

12.2. Tuner Section

12.2.1. AM-IF Alignment

AM-IF ALIGNMENT

•

SIGNAL GENERATOR OR SWEEP

CONNECTIONS FREQUENCY

Fashion a loop of several turns of wire and radiate signal into loop of receiver.

GENERATOR

450 kHz 30% Mod. at 400Hz.

RADIO DIAL SETTING INDICATOR

Point of noninterference (on/about 600 kHz)

Headphone Jack (32Ω) Fabricate the plug as shown in Fig. 2 and then connect the lead wires of the plug to the measuring instrument.

1. Set the unit to “AUX” position.

2. Insert the Normal blank tape (QZZCRA) into DECK 2 and set the unit to “REC” mode (● use “REC/STOP” key).

3. Adjust L1002 so that the output frequency is within the standard value.

Standard Value: 97 ±8 kHz

(ELECTRONIC

VOLTMETER

OSCILLOSCOPE)

ADJUSTMENT(Shown in

Fig.3)

Z102 (AM IFT) Adjust for maximum

REMARKS

output.

FM/AM-RF ALIGNMENT

•

SIGNAL GENERATOR OR SWEEP

CONNECTIONS FREQUENCY

Fashion a loop of several turns of wire and radiate signal into loop of receiver.

GENERATOR

520 kHz Tuning capacitor fully

600 kHz Tuning capacitor fully

RADIO DIAL SETTING

closed.

open.

INDICATOR

(ELECTRONIC

VOLTMETER

OSCILLOSCOPE)

Headphone Jack (32Ω) Fabricate the plug as shown in Fig. 2 and then connect the lead wires of the plug to the measuring instrument.

ADJUSTMENT(Shown in

Fig.1)

Z101 (AM OSC Coil) Adjust for maximum

Z101 (AM ANT Coil) Adjust for maximum

REMARKS

output.

12.3. Alignment Points

Cassette Deck Section

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Tuner Section

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13 Illustration of IC’s, Transistors and Diodes

M38B79MFA053 (100P) BH3874AKS2 (64P) MN662790RSC (80P)

BA7755A

2SD1859QRTV2

2SA933SSTA 2SC2787FL1TA 2SD2144STA KTC3199GRTA RVTDTC143EST 2SC2786MTA

RL1N4003S-P 1N5402BM21 1T3T

BU2090AF-E2 (16P) LA1833NMNTLM (24P) LC72131MDTRM (20P) AN7348STA-E1 (24P) BA4558FE2 (8P) AN8885SBE1 (28P)

KTC2026 KTA1046

KRC114STA

SVC211SPA-AL

0N2180RLC1

KTA12710YTA KTD1146YTA 2SB621ARSTA KTC3205YTA KRC101MTA KTC32030YTA

KRA102MTA KRC103MTA KRC102MTA KRA110MTA

SLI325URCT31 SLR325MCT31W

RSN3502C (14P)

TA7291P

M5218AP 93LC46B

AN8739SBE2

2SC2058SPTA

2SK544F-AC

2SA1037AKSTX 2SC2412KT96R KRA102STA KTC3875GRTA KRC111STA KTD1304TA KRC102STA KRA102STA

DAP202KT146

MA8300MTX 1SS355TE17 UDZSTE175R1B UDZSTE177R5B UDZTE173R6B UDZSTE179R1B

GP1S94 MA4020LTA MTZJ6R8BTA MTZJ4R7BTA MTZJ10BTA MTZJ15CTA MTZ556BTA

RVD1SS133TA 1SS291TA MA165TA MA700ATA MA723TA

1SS355TE17

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