Panasonic SAAK-631-GCP Service manual

CD Stereo System

SA-AK631GCP

Colour

(S)... Silver Type

ORDER NO. MD0503065C3

Specifications

n AMPLIFIER SECTION

RMS output power

THD 10%, both channels driven

1 kHz

(Low channel) 75 W per channel (5 Ω)

10 kHz

(High channel) 70 W per channel (5 Ω)

80 Hz

(Subwoofer channel) 160 W (8 Ω)

Total power output 450 W

n FM/AM TUNER, TERMINALS SECTION

Preset station FM 15 stations

AM 15 stations

Frequency Modulation (FM)

Frequency range

87.50 - 108.00 MHz (50 kHz steps)

Sensitivity 2.5 µV (IHF)

S/N 26 dB 2.2 µV

ntenna terminal(s) 75 Ω (unbalanced)

mplitude Modulation (AM)

Frequency range 522 - 1629 kHz (9 kHz steps)

520 - 1630 kHz (10 kHz steps)

Sensitivity

S/N 20 dB (at 999 kHz) 560 µV/m

udio performance (Amplifier)

Input sensitivity/Input impedance

ux 250 mV,14.7 kΩ

Phone jack

Terminal Stereo, 3.5 mm jack

n 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

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

NORMAL 35 Hz - 14 kHz

S/N ratio 50 dB (A weighted)

Wow and flutter 0.18 % (WRMS)

Fast forward and rewind time Approx. 120 seconds with

C-60 cassette tape

n DISC SECTION

Discs played [8 cm or 12 cm]

(1) CD-Audio (CD-DA)

(2) CD-R/RW (CD-DA, MP3 formatted disc)

(3) MP3

Bit rate

MP3 32 kbps - 320 kbps

Sampling frequency

MP3 32 kHz, 44.1 kHz, 48 kHz

CD 44.1 kHz

Decoding 16 bit linear

SA-AK631GCP

Digital filter 8fs

D/A converter MASH (1 bit DAC)

Pickup

Wavelength 780 nm

Beam Source Semiconductor laser

udio output (Disc)

Number of channels 2 (Stereo) (FL,FR)

n GENERAL

Power Supply

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

Power consumption 279 W

Power consumption in standby mode

0.85 W

Dimensions (W x H x D) 250 x 330 x 341 mm

Mass 7.1 kg

Operating temperature range +5 to +35°C

Operating humidity range 5 to 90% RH (no condensation)

n SYSTEM

SC-AK631 (GCP) Music center: SA-AK631 (GCP)

Speaker: SB-AK630 (GC)

Subwoofer: SB-W AK630 (GC)

Notes:

1. Specifications are subject to change without notice. Mass and dimensions are approximate.

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

CONTENTS

Page Page

1 Before Use

2 Before Repair and Adjustment

3 Protection Circuitry

4 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

5 Handling the Lead-free Solder

5.1. About lead free solder (PbF)

6 Handling Precautions For Traverse Deck

7 Precaution of Laser Diode

8 Accessories

9 Operation Procedures

10 Disassembly and Assembly of Main Component

10.1. Disassembly flow chart

10.2. Gear for servicing (jig) Information

10.3. Disassembly of Top Cabinet

10.4. Disassembly of CD Lid

10.5. Disassembly of Rear Panel

10.6. Disassembly of CD Mechanism Unit

10.7. Disassembly of Main P.C.B.

10.8. Disassembly of Sub-Power P.C.B.

10.9. Disassembly of Power P.C.B.

10.10. Disassembly of Transforme r P.C.B. & Voltage Selector

10.11. Disassembly of Front Panel Unit

10.12. Disassembly of Deck Mechanism Unit

10.13. CD Mechanism Main Component Replaceme nt

Procedures

10.14. Replacement for the pinch roller ass 馳 and head block

10.15. Replacement for the Deck motor ass 馳, capstan belt A,

capstan belt B and winding belt

10.16. Replacement for the cassette lid ass 馳

10.17. Rectification for tape jam problem

11 Checking for major P.C.Bs

11.1. Checking of Main P.C.B.

11.2. Checking of Transformer P.C.B.

11.3. Checking of Panel, Deck & Deck Mechanism P.C.B.

11.4. Checking of Power P.C.B.

12 Self-Diagnostic Function

12.1. Self-diagnostic display

12.2. How to enter the Self-Diagnostic Function

12.3. Cassette Mechanism Test (For error code H01, H02, H03,

F01)

12.4. CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29,

F30, H15 & H16)

12.5. To clear all Error code

12.6. To exit from Self-Diagnostic function

12.7. Power Amplifier Failure (F61)

12.8. Description of Error Code

13 CD Test Mode Function

13.1. How to set CD test mode

13.2. CD Automatically Adjustment result indication

13.3. CD Mecha Aging Test Mode (CR20)

13.4. Micon ROM Checksum and Version Display Mode

14 Measurements and Adjustments

14.1. Cassette Deck Section

14.2. Tuner Section

14.3. Alignment Points

15 Block Diagram

16 Voltage Measurement

17 Schematic Diagram

17.1. (A) CD Servo Circuit

17.2. (B) Main (Tuner) Circuit

17.3. (B) Main Circuit

SA-AK631GCP

17.4. (C) Panel Circuit 70

17.5. (D) Transformer Circuit

17.6. (E) CD Detect Circuit, (F) Spindle Position Circuit, (G) CD

Loading Circuit & (L) Sub-Power Circuit

17.7. (H) Power Circuit

17.8. (I) Deck Circuit & (J) Deck Mechanism Circuit

18 Printed Circuit Board

18.1. (A) CD Servo P.C.B.

18.2. (B) Main P.C.B.

18.3. (C) Panel P.C.B.

18.4. (D) Transformer P.C.B.

18.5. (E) CD Detect P.C.B., (F) Spindle Position P.C.B., (G) CD

Loading P.C.B. & (K) Tuner Pack P.C.B.

18.6. (H) Power P.C.B. & (L) Sub-Power P.C.B.

18.7. (I) Deck P.C.B. & (J) Deck Mechanism P.C.B.

19 Wiring Connection Diagram

20 Illustration of IC 痴, Transistors and Diodes 21 Terminal Function of IC 痴

21.1. IC7002 (MN6627953HB) Servo processor/ Digital signal

22 Troubleshooting Guide

23 Parts Location and Replacement Parts List

processor/ Digital filter/ D/A converter

21.2. IC7003 (AN8739SBTE2) Focus coil/ Tracking coil/

Traverse motor/ Spindle motor drive

21.3. IC2801 (C2CBJG000561) System Microprocessor

23.1. Deck Mechanism (RAA3412-S)

23.2. CD Loading Mechanism (RD-DAC026-S)

23.3. Cabinet

23.4. Electrical Parts List

23.5. Packing Materials & Accessories Parts List

23.6. Packaging

100

102

111

112

SA-AK631GCP

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 C5820 and C5840 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 consum ption at AC 127 V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~500mA.

Current consum ption at AC 240 V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~350mA.

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 outline s 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-AK631GCP

4 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potent ial shock reasons prior to applyin g power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conduc tive surface such as aluminium foil, to prevent electrostatic charge build up or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can generate electrical charge to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installe d.

Caution

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize body motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).

5 Handling the Lead-free Solder

5.1. About lead free solder (PbF)

Distinction of PbF P.C.B.:

P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.

Caution:

Pb free solder has a higher melting point than standard

use a high temperature soldering iron. In case of soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).

· Pb free solder will tend to splash when heated too high (about 1100°F/600°C).

· W hen soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the

soldering points with the Pb free solder until it melts enough.

solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please

SA-AK631GCP

6 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. To prevent the breakdown of the laser diode, an antistatic shorting pin is inserted into the flexible board (FFC board).

3. Take care not to apply excessive stress to the flexible board (FFC board). When removing or connecting the short pin, finish the job in as short time as possible.

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 place, 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.

SA-AK631GCP

7 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.

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.

n Use of Caution Labels

SA-AK631GCP

8 Accessories

Remote Control

FM Antenna

AC Cord

AM Loop Antenna

AC Plug Adaptor

9 Operation Procedures

SA-AK631GCP

10 Disassembly and Assembly of Main Component

“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.

4. Refer to the Parts No. on the page of “Parts Location and Replacement Parts List” (Section 23), if necessary.

10.1. Disassembly flow chart

The following chart is the procedure for disassembling the casing and inside parts for internal inspection when carrying out the servicing.

To assemble the unit, reverse the steps shown in the chart as below.

SA-AK631GCP

10.2. Gear for servicing (jig) Information

1. This unit has a gear which is used for checking items (Open/Close of disc tray, up/down operation of traverse unit by manually) when servicing.

2. For preparation of gear (for servicing), perform the procedures as follows.

3. In case of re-servicing the same set, the “gear for servicing” may has been taken off because it has been used. The “gear for servicing” must be stored.

· Remove the gear provided with mecha cover as shown below.

· Insert the hexagonal screwdriver (2mm) into the gear, and then project the tip of screwdriver for 1~ 2 mm in length.

10.3. Disassembly of Top Cabinet

Step 1 Remove 2 screws at each side and 5 screws at rear

panel.

Step 2 Lift up both sides of the top cabinet, push the top cabinet towards the rear and remove the top cabine t.

SA-AK631GCP

10.4. Disassembly of CD Lid

(The CD changer unit can be removed after the CD Lid is removed)

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Opening the disc tray automatically (Using Power

Supply)

Step 1 Connect the AC power cord.

Step 2 Press the POWER button to power up the main unit.

Step 4 Release the 2 claws, and then remove the CD Lid.

Step 5 Press the OPEN/CLOSE button, the disc tray will close.

Step 3 Press the OPEN/CLOSE button, the disc tray will open

automatically.

SA-AK631GCP

Step 6 Press the POWER button to turn the power off.

· [Opening the disc tray manually (Using service tools)]

Step 2 Release the 2 claws, and then remove the CD lid cover.

Step 3 Repeat Step 2 but rotate the gear tools in anti-clockwise

direction.

Step 1 Insert the gear tool into the hole on the underside of CD chassis and then rotate in the direction of arrow. The disc tray will be opened.

Step 4 The disc tray will be closed.

10.5. Disassembly of Rear Panel

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

Step 1 Remove 10 screws and disconnect wire CN281 0 (Fan) at rear cabinet as shown.

SA-AK631GCP

10.6. Disassembly of CD Mechanism Unit

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

Step 1 Remove one screw at rear panel.

Step 2 Detach the FFC wires (CN2801 & CN2805).

Step 4 Remove 4 screws.

Step 5 Remove the CD chassis.

Step 6 Lay the CD mechanism unit as shown.

· For disassembly of CD mechanism unit, please refer to

Section 10.13 of this manua l.

Step 3 Releas e the claws of both ends, and then lift up the CD Mechanism Unit.

SA-AK631GCP

10.7. Disassembly of Main P.C.B.

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid

· Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel

· Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit

Step 1 Disconnect FFC wires CN2803 & CN2806 from Main P.C.B.

Step 2 Lift up Main P.C.B. by disconnecting connectors CN5800 & CN5801 as arrow shown above.

10.8. Disassembly of Sub-Power P.C.B.

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid

· Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel

· Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit

· Follow the (Step 1) - (Step 2) of Item 10.7 - Disassembly of Main P.C.B.

Step 1 Remove the 2 screws fixed at Sub Power P.C.B..

Step 2 Remove 2 screws at Power Amplifier IC.

Step 3 Disconnect connector CN5803

Step 4 Lift up the Sub Power P.C.B. to remove it.

· Replacement of Power Amplifier IC

Step 1 Desolder the terminals of Power Amplifier IC and

replace the component.

10.9. Disassembly of Power P.C.B.

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid

· Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel

· Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit

· Follow the (Step 1) - (Step 2) of Item 10.7 - Disassembly of Main P.C.B.

Step 1 Remove the 2 screws fixed at heat sink.

Step 2 Remove 1 screw fixed at Power P.C.B..

SA-AK631GCP

Note:

Insulate the Power P.C.B. with insulation material to avoid short circuit.

SA-AK631GCP

· Replacement of the Power Amplifier IC/ Voltage Regulator

Step 1 Remove 2 screws fixed to the Power Amplifier IC and 1

screw to Voltage Regulator.

Step 2 Break the joint with a metal cutter as shown below.

Step 3 Unsold er the terminals of Power Amp IC, transistor and

replace the components.

Step 4 Fix back the cut portion with a screw as shown.

10.10. Disassembly of Transformer P.C.B. & Voltage Selector

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid

· Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel

· Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit

Step 1 Remove 3 screws, disconnect connector CN5950.

10.11. Disassembly of Front Panel Unit

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid

· Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit

Step 1 Lay the unit as shown below.

Step 3 Remove volume knob and adaptor.

· Disasse mbly of Panel P.C.B.

SA-AK631GCP

Step 2 Release 2 claws at bottom and 2 claws each side, draw

the front panel ass’y forward.

Step 4 Remove 10 screws.

Step 5 Disconnect connectors (CN2806, CN2803 and

CN5950).

10.12. Disassembly of Deck Mechanism Unit

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid

· Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit

· Follow the (Step 1) - (Step 3) of Item 10.11 - Disassembly of Front Panel Unit

Step 1 Detach FFC wire (CN971).

Step 2 Disconnect FFC flat cable from the connector

(CN1001).

Step 3 Remove the 5 screws.

SA-AK631GCP

Step 5 Tilt the cassette mechanism unit in the direction of

arrow (1), and then remove it in the direction of arrow (2).

· For replacement of Deck Mechanism P.C.B.

Step 6 Remove 3 screws.

Step 7 Unsolder the motor terminals.

Step 4 Push the lever upward, and then open the cassette lid

ass’y (For DECK1 and DECK2).

Step 8 Remove Deck Mechanism P.C.B.

10.13. CD Mechanism Main Component Replacement Procedures

· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid

· Follow the (Step 1) - (Step 6) of Item 10.6 - Disassembly of CD Mechanism Unit

10.13.1. Replacement of the Traverse Deck

Step 1 Remove the CD changer unit.

Step 2 Insert the gear with hexagonal wrench into the hole.

Step 3 Rotate the hexagonal wrench in the direction of arrow

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

SA-AK631GCP

Caution:

When removing or inserting the traverse deck avoid touching the OPU lens and pressing onto the turntable.

Step 8 Remove 3 screws.

Step 9 Unsolder the motor terminals (4 points).

Step 4 With pressing the claw (A), rotate the hexagonal wrench

clockwise. (The slide plate R moves for a little amount.)

Step 5 Pressing the claw (B) in the direction of arrow (1), the connection lever moves in the direction of arrow (2).

Step 6 Lift up the traverse deck ass’y.

Step 10 Remove the FFC board from the connector, and then

remove the CD Servo P.C.B.

Step 7 Remove the traverse deck ass’y from the timing lever.

SA-AK631GCP

Step 11 Remove the pin.

· Note for installation of the CD servo P.C.B.

Step 12 Release the claw, and then remove the traverse deck

ass’y.

Note:

Be careful not to lose the 3 floating spring because those will also be removed on removal of the traverse deck ass’y.

· 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 ass’y.

Step 3 Remove 3 screws.

Step 4 Solder.

· Installation for traverse deck ass’y

Step 1 Install the traverse deck ass’y to the timing lever.

Step 2 Align the boss of traverse deck ass’y with the slot of

traverse cam gear.

Step 3 Force the claw of timing lever.

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Step 4 Force the disc tray fully.

10.13.2. Replacement for the Disc Tray

Step 1 Remove 4 screws.

Step 2 Remove the upper plate.

Step 5 With pressing the claw (B) in the direction of arrow (1),

force the connection lever in the direction of arrow (2).

Step 3 Remove 3 screws.

Step 4 With lifting the claw in the direction of (1), draw the CD

Detect P.C.B. in the direction of arrow (2).

Step 5 Remove the mechanism cover.

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Step 6 Insert the gear with hexagonal wrench into the hole.

Step 9 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]

Step 7 Rotate the hexagonal wrench in the direction of arrow,

and then open the disc tray fully.

Step 8 Release the both claws, and then draw the disc tray.

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

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

Step 3 Align the drive rack with the drive gear.

NOTE:

Force the right guide bar of tray base manually not to move upwards.

Step 4 Holdin g the disc tray manually, push the disc tray in the direction of the arrow.

10.13.3. Disassembly and reassembly for mechanism base drive unit

SA-AK631GCP

Step 1 Remove 3 screws.

Step 2 Release the claw, and then remove the gear holder.

Step 3 Remove the belt and change gear spring.

Step 5 Release the 2 claws, and then remove the bottom SW

P.C.B..

NOTE:

Take care not to lose the change gear spring.

Step 4 Remove the pulley gear, change gear and UP/DOWN gear.

SA-AK631GCP

Step 6 Install the tray lock spring to hook temporary.

Step 7 Release the claw, and then remove the tray lock.

Step 8 Release the claw, and then remove the rear lock.

Step 9 Pressing the claw (B) in the direction of arrow (1), force

the connection lever in the direction of arrow (2).

Step 10 Move the slide plate 1 to the end of stock side.

Step 11 Lift up the left end of spindle base unit in the direction of arrow (1), and then remove the unit in the direction of arrow (2).

SA-AK631GCP

Step 13 Remove the traverse relay gear, traverse cam gear

and drive gear.

Step 12 Remove slide plate 1 and slide plate 2.

[Dissassembly/reas sembly for the spindle base unit]

Step 1 Draw the 5 disc spacers.

Step 2 Pushing the claw, slide the support plate in the direction

of arrow, and then remove it.

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Step 3 Rotate the disc lever in the direction of arrow (1), draw

the disc lever.

NOTE:

Hold the loading stopper ass’y manually bacause it is flipped by spring.

NOTE:

Take care not to lose the disc lever spring.

Step 4 Release the 2 claws, and then draw the relay gear B.

Step 5 Release the 2 claws as shown below.

Step 6 Remove the cushion spring.

Step 7 Remove the loading stopper ass’y in the direction of

arrow.

SA-AK631GCP

Step 8 Release the 2 claws, and then remove the relay gear A.

Step 9 Release the 2 claws, and then remove the spindle shaft.

Step 10 Remove the lower spindle spring with tweezers.

Step 11 Force the lower hook with thin tip of minus screwdriver.

Step 12 Squeeze the shaft of lower hook, and then draw it.

Step 13 Rotate the lower spindle in the direction of arrow until

the lower spindle interferes with stopper.

Step 14 Insert the thin tip of minus screwdriver between the lower spindle and UP/DOWN base, and then slacken the lower spindle to release the stopper. Then, rotate the lower spindle and remove it.

Step 15 Rotate the UP/DOWN base at a 90° angle. Then,

SA-AK631GCP

spread the hold bars of loading stopper and remove the UP/DOWN base.

[Installation for loading stopper ass’y]

Step 1 Align the claw of loading stoppers ass’y with the slot of

spindle base. (Caution should be exercised when alignment of claw due to the size of claws.)

Step 2 Lower the loading stopper ass’y, and then align the lower spindle with the trapezoid tooth of relay gear A.

Step 1 Install the traverse cam gear.

Step 2 Rotate the traverse cam gear to the direction of arrow.

Step 3 Install the drive gear and traverse relay gear.

Step 3 Force the loading stopper ass’y, latch the claw firmly.

[Reassembly for mechanism base drive unit]

*When installing the traverse relay gear, align the trapezoid tooth of gear with tooth of traverse cam gear.

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