SA SA AK770 Service Manual

ORDER NO. MD0806001CE

CD Stereo System

SA-AK770EB SA-AK770EG

Colour (K)... Black Type

Notes: This model’s CD mechanism changer unit is CR14C. Please refer to the original Service Manual (Order No. MD0805031CE) for this mechanism.

Specifications

■ AMPLIFIER SECTION

RMS output power Front Ch (both channels driven)

250 W per channel (6 Ω), 1 kHz, 10% THD

Subwoofer Ch

200 W per channel (6 Ω), 100 Hz, 10% THD

Total RMS stereo mode power 700 W

■ FM/AM TUNER, TERMINALS SECTION

Preset station FM 30 stations

AM 15 stations Frequency Modulation (FM) Frequency range

87.50 to 108.00 MHz (100 kHz steps) Antenna terminal(s) 75 Ω (unbalanced) Amplitude Modulation (AM) Frequency range

522to1629kHz(9kHzsteps) Music Port (front) jack Sensitivity 100 mV, 4.0 k Ω Terminal Stereo, 3.5 mm jack Headphone jack Terminal Stereo, 3.5 mm jack Output level (CD, 1 kHz, -20 dB) 32 Ω (Max)

■ CASSETTE DECK SECTION

Type 1way 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 Erase system AC erase 100 kHz Tape speed 4.8 cm/s Overall frequency response (+3, -6 dB) at DECK OUT NORMAL 35 Hz to 10 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

■ DISC SECTION

Disc played [8 cm or 12 cm] (1) CD-Audio (CD-DA) (2) CD-R/RW (CD-DA, MP3* formatted disc) (3) MP3* * MPEG-1 Layer 3, MPEG-2 Layer 3 Pick up Wavelength 780 nm Beam Source Semiconductor laser

A-AK770EB/SA-AK770E

Audio output (Disc) Number of channel 2.1 (FL, FR, SW) FL = Front left channel FR = Front right channel SW = Subwoofer channel

■ USB SECTION

USB Port USB Standard USB 2.0 full speed Media file format support MP3 (*.mp3) USB device file system FAT 12 FAT 16 FAT 32 USB port power 500 mA (Max) USB Ripping (recording) Recording file format MP3 (*.mp3) Bit rate 128 kbps / 192 kbps / 320 kbps USB recording speed 1x, max 4x (CD only)

■ GENERAL

Power supply

AC 230~240 V, 50H Power consumption 145 W Dimensions (WxHxD) 250 x 331 x 334 mm Mass 4.9 kg Operating temperature range 0 to 40°C Operating humidity range 35 to 80% RH (no condensation) Power consumption in standby mode:

0.4 W (approx.)

■ SYSTEM

SC-AK770 (EB) Music center: SA-AK770 (EB)

Speakers: SB-AK770 (PL)

Subwoofer: SB-WAK770 (PL)

SC-AK770 (EG) Music center: SA-AK770 (EG)

Speakers: SB-AK770 (PL)

Subwoofer: SB-WAK770 (PL)

For information on speaker system, please refer to the original Service Manual (Order No. MD0805008CE) for SB-AK770PL-K & (Order No. MD0805009CE) for SB-WAK770PL-K.

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 Safety Precautions 2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices 6 3 Handling Precautions for Traverse Unit 4 Precaution of Laser Diode 5 About Lead Free Solder (PbF) 6 Operation Procedures 7 Self diagnosis and special mode setting 8 Assembling and Disassembling 9 Disassembly and Assembly of Traverse Unit Assembly in

Play Position 10 Service Fixture and Tools 11 Service Positions

12 Procedure for Checking Operatio n of Individual Parts of Deck

Mechanism Unit

13 Measurement And Adjustments

14 Voltage Measurement and Waveform Chart

15 Wiring Diagram 16 Block Diagram

10 11

17 Notes Of Schematic Diagram

18 Schematic Diagram

19 Printed Circuit Board 20 Illustration of ICs, Transistors and Diodes

21 Terminal Function of Integrated Circuits

22 Exploded Views 23 Replacement Parts List

65 66 68 77 79 87

89 107 115 116 119 123

1 Safety Precautions

SA-AK770EB / SA-AK770EG

1.1. General Guidelines

1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

2. After servicing, ensure that all the protective devices such as insulation barriers and insulation papers shields are properly installed.

3. After servicing, check for leakage current checks to prevent from being exposed to shock hazards.

1.1.1. Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the two prongs on the plug.

2. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be between 1MΩ and 5.2MΩ. When the exposed metal does not have a return path to the chassis, the reading must be

1.1.2. Leakage Current Hot Check (See Figure 1)

1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitor, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1.

3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.

4. Check each exposed metallic part, and measure the voltage at each point.

5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.

6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. Should the measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.

Fig. 1

-AK770

EB / SA-AK

770

1.2. Caution for AC Mains Lead

1.3. Before repair and adjustment

Disconnect AC power, discharge AC Capacitors C5700, C5701, C5703, C5704, C5705, C5706 & C5707 through a 10Ω,5W

SA-AK

770

EB / SA-AK

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 - 240V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 500mA.

1.4. 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.

1.5. Safety Part Information

Safety Parts List:

There are special components used in this equipment which are important for safety. These parts are marked by

be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of manufacturer.

Table 1

Reference No. Part No. Part name & Description Remarks 18 RGRX0070H-A REAR PANEL [M] EG 18 RGRX0070H-B REAR PANEL [M] EB 36 RKMX0144-K TOP CABINET [M] 84 REXX0684 RED WIRE [M] 85 REXX0685 BLACK WIRE [M] 340 RAEX0190A-V TRAVERSE UNIT (W/O CD

A2 K2CQ2CA00007 AC CORD [M] EG A2 K2CT3CA00004 AC CORD [M] EB PCB3 REPX0622F SMPS P.C.B [M] (RTL) PCB9 REPX0622F AC INLET P.C.B [M] (RTL) DZ5701 ERZV10V511CS ZENER [M] L5001 G0B9R5K00003 LINE FILTER [M] L5002 G0B9R5K00003 LINE FILTER [M] L5701 ELF15N035AN LINE FILTER [M] L5703 ELF22V020A LINE FILTER [M] T2900 G4D1A0000117 SWITCHING TRANSFORMER [M] T5701 ETS48AB116AC TRANSFORMER [M] T5751 ETS19AB256AG BACKUP SW TRANSFORMER [M] PC5701 B3PBA0000402 PHOTO COUPLER [M] PC5702 B3PBA0000402 PHOTO COUPLER [M] PC5720 B3PBA0000402 PHOTO COUPLER [M] PC5799 B3PBA0000402 PHOTO COUPLER [M] F1 K5D502BNA005 FUSE [M] FP2901 K5G4013A0001 FUSE PROTECTOR [M] TH5701 D4CAC8R00002 THERMISTOR [M] TH5860 D4CC11040013 THERMISTOR [M] P5701 K2AA2B000017 AC INLET [M] C5700 F1BAF1020020 1000pF [M] C5701 F0CAF334A087 0.33uF [M] C5703 F0C2H1040001 0.1uF 500V [M] C5704 F1BAF1020020 1000pF [M] C5705 F1BAF1020020 1000pF [M] C5706 F1BAF1020020 1000pF [M] C5707 F1BAF1020020 1000pF [M]

in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts should

[M] (RTL)

SERVO P.C.B.)

770

-AK77

0EB / SA-AK770EG

2 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-equiped 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 potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive 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 installed.

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).

3 Handling Precautions for Traverse Unit

SA-AK770EB / SA-AK770EG

The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be taken avoid caution to electrostatic breakdown when servicing and handling the laser diode in the traverse unit.

3.1. Cautions to Be Taken in Handling the Optical Pickup Unit

The laser diode in the optical pickup unit may be damaged due to electrostatic discharge generating from clothes or human body. Special care must be taken avoid caution to electrostatic discharge damage when servicing the laser diode.

1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.

2. To prevent the laser diode from the electrostatic discharge damage, the flexible cable of the optical pickup unit removed should be short-circuited with a short pin or a clip.

3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the flexible cable.

4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexible cable, cut off the antistatic FPC.

3.2. Grounding for electrostatic breakdown prevention

Some devices such as the CD player use the optical pickup (laser diode) and the optical pickup will be damaged by static electricity in the working environment. Proceed servicing works under the working environment where grounding works is completed.

3.2.1. Worktable grounding

1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.

3.2.2. Human body grounding

1. Use the anti-static wrist strap to discharge the static electricity form your body.

A-AK770EB/SA-AK770E

4 Precaution of Laser Diode

SA-AK770EB / SA-AK770EG

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 : 780 nm Maximale Strahlungsleistung der Lasereinheit :100 µW/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.

-AK77

0EB / SA-AK770EG

5 About Lead Free Solder (PbF)

5.1. Service caution based on legal restrictions

5.1.1. General description about Lead Free Solder (PbF)

The lead free solder has been used in the mounting process of all electrical components on the printed circuit boards used for this equipment in considering the globally environmental conservation.

The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy mainly consists of tin (Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86°F) more than that of the normal solder.

Definition of PCB Lead Free Solder being used

The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder. (See right figure)

Service caution for repair work using Lead Free Solder (PbF)

• The lead free solder has to be used when repairing the equipment for which the lead free solder is used. (Definition: The letter of “PbF” is printed on the PCB using the lead free solder.)

• To put lead free solder, it should be well molten and mixed with the original lead free solder.

• Remove the remaining lead free solder on the PCB cleanly for soldering of the new IC.

• Since the melting point of the lead free solder is higher than that of the normal lead solder, it takes the longer time to melt

the lead free solder.

• Use the soldering iron (more than 70W) equipped with the temperature control after setting the temperature at 350±30 degrees C (662±86°F).

Recommended Lead Free Solder (Service Parts Route.)

• The following 3 types of lead free solder are available through the service parts route. RFKZ03D01K-----------(0.3mm 100g Reel) RFKZ06D01K-----------(0.6mm 100g Reel) RFKZ10D01K-----------(1.0mm 100g Reel)

Note

* Ingredient: Tin (Sn), 96.5%, Silver (Ag) 3.0%, Copper (Cu) 0.5%, Cobalt (Co) / Germanium (Ge) 0.1 to 0.3%

6 Operation Procedures

6.1. Main Unit Key Buttons Operations

A-AK770EB/SA-AK770E

-AK770

EB / SA-AK

770

6.2. Remote Control Key Buttons Operations

6.3. Using the Music Port

SA-AK

EB / SA-AK

This feature enables you to enjoy music from a portable audio equipment.

770

-AK770

EB / SA-AK

770

6.4. Connecting and Playing a Bluetooth Device

6.5. Connecting and Playing a USB Mass Storage Class Device

SA-AK

EB / SA-AK

770

-AK770

EB / SA-AK

770

7 Self diagnosis and special mode setting

This unit is equipped with features of self-diagnostic & special mode setting for checking the functions & reliability. Special Note : Checking of the reliability (ageing) & changer operation must be carry out to ensure good working condition

in unit.

7.1. Service Mode Summary Table

The service modes can be activated by pressing various button combination on the main unit and remote control unit.Below is the summary for the various modes for checking:

Player buttons Remote control unit buttons Application Note

[STOP] [4], [7] Entering into doctor mode (Refer to section .7.2.1. service mode

[STOP] [

Mode Remote control unit buttons Application Note

In Doctor Mode [1] FL all segment & LED inspection (Refer to section .7.2.2. service mode

[MUSIC.P] Tuner Check (Refer to section .7.2.2. service mode

[ ], [1], [1] CD Loading Test Mode (Refer to section .7.2.2. service mode

[ ], [1], [2] CD Traverse Unit Test Mode (Refer to section .7.2.2. service mode

[ ], [1], [3] CD Combination Test Mode (Refer to section .7.2.2. service mode

] Entering into service mode (Refer to section .7.2.1. service mode

[7] Volume 50 setting check (Refer to section .7.2.2. service mode

[8] Volume 35 setting check (Refer to section .7.2.2. service mode

[9] Volume 0 setting check (Refer to section .7.2.2. service mode

[2] Micro-P Version Display (Refer to section .7.2.2. service mode

[4] CD→USB Recording & Playing inspection (Refer to section .7.2.2. service mode

[5] CD-MP3 Reading & Playing inspection (Refer to section .7.2.2. service mode

Table 1 for more information.)

Table 2 for more information.)

Mode Remote control unit buttons Application Note

In Service Mode [1] self diagnostic history (Refer to section .7.2.3. service mode

[2] Micro-P FW (Refer to section .7.2.3. service mode

[3] Cold Start (Reset) (Refer to section .7.2.3. service mode

Table 3 for more information.)

7.2. Service Mode Table

Below is the various special modes for checking:-

7.2.1. Service Mode Table 1

Item FL Display Key Operation

Mode Name Description Front Key

Doctor Mode To enter into Doctor

Mode.

Service Mode To enter into Service

Mode.

In any mode:

1. Press [ ] button on main unit follow by [4] and [7] on remote control.

To exit Doctor Mode, press [ unit or remote control.

1. Select [CD] for DISC mode (Ensure no disc is inserted).

2. Press and hold [ main unit for 2 seconds follow by [ on remote control.

To exit, press [ control.

] button on main unit or remote

] button on main

]button on

]

7.2.2. Service Mode Table 2

SA-AK770EB / SA-AK770EG

Item FL Display Key Operation

Mode Name Description Front Key

FL Display Test To check the FL

segments display (All segments will light up)

In doctor mode:

1. Press [1] button on remote control. To exit Doctor Mode, press [

main unit or remote control.

] button on

Tuner Check To Inspect Tuner Check In doctor mode:

Volume Setting Mode

Micro-P Version Display

To check for the volume setting of the main unit. The volume will be automatically set to its respective level (in dB). During this mode, treble/bass/EQ will be set to ‘0’dB & OFF.

Checking of various items and firmware version.

Note: The microprocessor version as shown is an example. It will be revise when there is an updates.

Display 1 In doctor mode:

1. Press [MUSIC.P] button on remote control. To exit Doctor Mode, press [

main unit or remote control.

1. Press [7] button on remote control. To exit Doctor Mode, press [ main unit or remote control.

2. Press [8] button on remote control. To exit Doctor Mode, press [ main unit or remote control.

3. Press [9] button on remote control. To exit Doctor Mode, press [ main unit or remote control.

In doctor mode:

1. Press [2] button on remote control. To exit Doctor Mode, press [

main unit or remote control.

] button on

CD→USB Recording & Playing inspection

To check for the CD→USB Recording setting of the main unit. The volume will be automatically set to its respective level (in dB). During this mode, treble/bass/EQ will be set to ‘0’dB & OFF.

In doctor mode:

1. Press [4] button on remote control. To exit Doctor Mode, press [

main unit or remote control.

] button on

A-AK770EB/SA-AK770E

Mode Name Description Front Key

CD-MP3 Reading & Playing inspection

CD Loading Test Mode

Item FL Display Key Operation

To check for the CD-MP3 Reading setting of the main unit. The volume will be automatically set to its respective level (in dB). During this mode, treble/bass/EQ will be set to ‘0’dB & OFF.

(For more information, refer to section 8.2.4)

To determine the reliability of CD Loading Unit.

To check for the open/close operation for the CD loading unit. It fails when there is abnormality in opening or closing.

In doctor mode:

1. Press [5] button on remote control. To exit Doctor Mode, press [

main unit or remote control.

In doctor Mode:

1. Press [ control.

To cancel, press [PROGRAM] button on remote control. To exit Doctor Mode, press [ ] button on main unit or remote control.

] button on

], [1] & [1] button on remote

CD Traverse Unit Test Mode

CD Combination Test Mode

To check for the traverse unit operation. In this mode, the first & lost track is access & read (TOC). It fails when TOC is not completed by IDS or the traverse is out of focus.

A combination of CD loading & Traverse unit test.

In doctor Mode:

1. Press [ ], [1] & [2] button on remote

To cancel, press [PROGRAM] button on remote control. To exit Doctor Mode, press [ main unit or remote control.

In doctor Mode:

1. Press [

To cancel, press [PROGRAM] button on remote control. To exit Doctor Mode, press [ ] button on main unit or remote control.

7.2.3. Service Mode Table 3

Item FL Display Key Operation

Mode Name Description Front Key

Self Diagnostic History

Micro-P Version Display

Checking the records for self-diagnostic.

Checking of various items and firmware version.

Note: The microprocessor version as shown is an example. It will be revise when there is an updates.

(Display 1)

In service mode:

1. Press [1] button on remote control. To exit Service Mode, press [

main unit or remote control. To clear history, press & hold [0] for 5 seconds or more.

In service mode:

1. Press [2] button on remote control. To exit Service Mode, press [

main unit or remote control.

control.

] button on

], [1] & [3] button on remote

control.

] button on

FL Display sequenceDisplay [

]

(Display 2)

Item FL Display Key Operation

Mode Name Description Front Key

Cold Start (Reset)

To activate cold start ipon next AC power up.

In service mode:

1. Press [3] button on remote control. To exit Service Mode, press [

main unit or remote control.

7.3. Reliability Test Mode (CR14C Mechanism)

Below is the process flow chart of ageing for the Mechanism unit (CR14C).

A-AK770EB/SA-AK770E

] button on

A-AK770EB/SA-AK770E

SA-AK

EB / SA-AK

770

7.4. Error code Table Display

Self-Diagnosis Function (refer Section “7.2.1 Service Mode Table 1”) provides information on any problems occuring for the unit and its respective components by displaying the error codes. These error code such as U**, H** and F** are stored in memory and held unless it is cleared.

The error code is automatically display after entering into self-diagnostic mode.

-AK77

0EB / SA-AK770EG

7.4.1. Error Code Table (For Deck Mechanism)

Error Code

H01 Mode SW,

H02 Rec INH SW

H03 HALF SW

F01 Reel pulse

F02 TPS

Diagnosis

Contents

plunger and capstan motor abnormal

abnormal

Description of error Automatic FL Display Remarks

Normal operation during mecha transition, MODE SW abnormal is memorized. The content of abnormality can be confirmed in the abnormal detection mode explained in the later section.

The content of abnormality can be confirmed in the abnormal detection mode explained in the later section.

7.4.2. Error Code Table (For CD Mechanism Unit)

For deck mechanism unit. Press [ ] on main unit for next error.

For deck mechanism unit. Press [ error.

For deck mechanism unit. Press [ ] on main unit for next error.

For deck mechanism unit. Press [ error.

For deck mechanism unit. Press [ ] on main unit for next error.

] on main unit for next

Error Code Diagnosis Contents Description of error Automatic FL Display Remarks

LOAD Load operation faulty The load operation does

UNLD Unload operation

faulty

UP Exchange open

operation faulty

DOWN Down operation faulty The down operation does

OPEN Open operation faulty The open operation does

not complete after fail-safe mode has time-out. The checking operation repeats and this error code appears after the second time-out occurs.

The unload operation does not complete after fail-safe mode has time-out. The checking operation repeats and this error code appears after the second time-out occurs.

The exchange open operation does not complete after fail-safe mode has time-out. The checking operation repeats and this error code appears after the second time-out occurs.

not complete after fail-safe mode has time-out. The checking operation repeats and this error code appears after the second time-out occurs.

For CD Mechanism unit (CR14C). Press [EXCHANGE] on main unit for next error.

Error Code Diagnosis Contents Description of error Automatic FL Display Remarks

CLOSE Close operation faulty The close operation does

not complete after fail-safe mode has time-out. The

For CD Mechanism unit (CR14C). Press [EXCHANGE] on main unit for

next error. checking operation repeats and this error code appears after the second time-out occurs.

MODEL Mode change to

updown operation faulty

The mode change to up/down operation does not complete after fail-safe

For CD Mechanism unit (CR14C).

Press [EXCHANGE] on main unit for

next error. mode has time-out. The checking operation repeats and this error code appears after the second time-out occurs.

MODEH Mode change to

horizontal operation faulty

The mode change to horizontal operation does not complete after fail-safe

For CD Mechanism unit (CR14C).

Press [EXCHANGE] on main unit for

next error. mode has time-out. The checking operation repeats and this error code appears after the second time-out occurs.

INITIALIZE Initialize operation

faulty

The initialize operation does not complete after failsafe mode has time-out.

For CD Mechanism unit (CR14C).

Press [EXCHANGE] on main unit for

next error. The checking operation repeats and this error code appears after the second time-out occurs.

A-AK770EB/SA-AK770E

7.4.3. Error Code Table (For Power Supply)

Error Code

F61 Power Amp

F76 DCDET1 = L (NG)

F61-76 Both DCDET1 and

Diagnosis

Contents

IC output abnormal

Description of error Automatic FL Display Remarks

Upon power on, PCNT=HIGH, DCDET2=L after checking LSI.

DCDET2 “L“ (NG)

For power. Press [ ] on main unit for next error.

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EB / SA-AK

770

8 Assembling and Disassembling

8.1. Caution

Special Note:

“Attention Servicer”

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

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

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

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

Caution:

Below is the list of disassembly sections

• Disassembly of Top Cabinet

• Disassembly of Mechanism Unit (CR14C)

• Disassembly of Jupiter USB P.C.B.

• Disassembly of Fan Unit

• Disassembly of D-Port (Option Port) P.C.B.

• Disassembly of Rear Panel

• Disassembly of Front Panel Unit

• Disassembly of Panel P.C.B., Tact Switch P.C.B., Remote Sensor P.C.B., Side Bar (L) Led P.C.B. & Side Bar (R) Led

• Disassembly of USB Connector/Led P.C.B.

• Disassembly of Music Port P.C.B.

• Disassembly of CD Lid

• Disassembly of Deck Mechanism Unit

• Disassembly of Deck P.C.B.

• Disassembly of Deck Mechanism

• Disassembly of Deck Mechanism P.C.B.

• Disassembly of Cassette Lid

• Rectification for Tape Jam Problem

• Disassembly of Traverse Unit

• Disassembly of D-Amp P.C.B.

• Replacement of Audio Digital Power Amp IC (IC5400)

• Replacement of Audio Digital Power Amp IC (IC5000)

• Replacement of Audio Digital Power Amp IC (IC5200)

• Disassembly of Main P.C.B.

• Replacement for Voltage Regulator IC (IC2761)

• Replacement for Switch Regulator (Q2751)

• Disassembly of SMPS P.C.B.

• Replacement for Switch Regulator IC (IC5701)

This model uses a new Mechanism unit (CR14C). In this following section does not contain the necessary disassembly & assembly information for the Mechanism unit (CR14C) except the disassembly & assembly of traverse unit. Kindly refer to the original service manual for the Mechanism unit. (Order No. MD0805031CE).

Some chassis components may have sharp edges. Be careful when disassembling and servicing.

components.

Special reassembly procedures are described only when required.

After replacing of Mechanism Unit (CR14C), ageing test is necessary. Please confirm operation for Mechanism Unit (CR14C).

P.C.B.

• Replacement for Switch Regulator Diode (D5702)

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• Replacement for Regulator Diode (D5801)

• Replacement for Regulator Diode (D5802)

• Replacement for Regulator Diode (D5803)

• Disassembly of AC Inlet P.C.B.

Below shown is part no. of different screws types used:

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8.2. 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.

8.3. Main Components and P.C.B. Location

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8.4. Disassembly of Top Cabinet

Step 1

Remove 3 screws on both sides of Top Cabinet.

catches.

Step 2 Remove 5 screws at the rear panel.

Step 5 Lift up the Top Cabinet and remove it in the direction of

arrow.

Step 3 Lift the sides of Top Cabinet outwards as arrow shown.

Step 4 Push the Top Cabinet backwards to release the

8.5. Disassembly of Mechanism Unit (CR14C)

• Follow the (Step 1) - (Step 5) of Item 8.4

Step 1 Remove 1 screw at rear panel.

Step 2 Detach 22P FFC cable at connector (CN2801) at Main

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P.C.B.. Step 3 Detach 11P FFC cable at connector (CN2802) at Main

P.C.B.. Step 4 Detach 6P FFC cable at connector (CN2815) at Main

P.C.B.. Step 5 Detach 20P FFC cable at connector (CN2804) at Main

P.C.B.. Step 6 Detach 5P cable at connector (CN1113) at USB

Connector/Led P.C.B..

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Special Note: During reassembling procedure, ensure both the

claws and catches are fully catched. Assembly is secured upon hearing a click sound.

Step 9 Release the tabs at the bottom of the front panel.

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Step 7 Release the claws outwards on both sides. Step 8 Release catches at both sides.

Caution: Do not exert strong force when releasing the tabs. Step 10 Shift the front panel unit slightly forward in the direction

of arrows.

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Step 11 Release mechanism unit from the 2 locators. Step 12 Lift up the Mechanism Unit (CR14C).

Notes:

1. For disassembly & assembly of traverse unit, please refer to

original Service Manual for the Disassembly and Assembly of the Mechanism Unit (CR14C).

2. During reassembling procedure, ensure the Mechanism

Unit (CR14C) is seated properly at the locators.

8.6. Disassembly of Jupiter USB P.C.B.

• Follow the (Step 1) - (Step 5) of Item 8.4

• Follow the (Step 1) - (Step 12) of Item 8.5

Step 1 Remove 2 screws.

• Disassembly of Mecha Chassis Step 13 Remove 2 screws. Step 14 Remove the Mecha Chassis as arrow shown.

Step 2 Remove Jupiter USB Unit. Step 3 Release catches. Step 4 Remove Jupiter USB Cover in the direction of arrow.

+ 106 hidden pages

SA SA AK770 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual