Panasonic SAAK-640-E, SAAK-640-EG, SAAK-640-EB Service manual

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ORDER NO. MD0601012C2
CD Stereo System
SA-AK640E SA-AK640EB SA-AK640EG
Colour
(S)... Silver Type
Notes: This model’s CD mechanism changer unit is CRS1. Please refer to the original Service Manual (Order No. MD0509368C0) for this mechanism.
Specifications
n AMPLIFIER SECTION
RMS output power
THD 10%,
1 kHz
(Low channel-both channels driven)
90 W per channel (3 Ω)
10 kHz
(High channel-both channels driven)
90 W per channel (3 Ω)
(Subwoofer channel) 180 W (8 Ω)
Total output power 540 W
n FM/AM TUNER, TERMINALS SECTION
Preset station FM 15 stations
AM 15 stations
Frequency Modulation (FM)
Frequency range
87.50 to 108.00 MHz (50 kHz steps)
Sensitivity 4.0 µV (IHF)
S/N 26dB 2.2 µV
ntenna terminal(s) 75 (unbalanced)
mplitude Modulation (AM)
Frequency range 522 to 1629 kHz (9 kHz step)
Sensitivity
S/N 20dB (at 999 kHz) 560 µV/m
Music Port input jack
Terminal Stereo, 3.5 mm jack
Sensitivity 100 mV, 4.7 k
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, -6 dB) at DECK OUT
NORMAL 35 Hz to 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
Disc played [8 cm or 12 cm]
(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3, WMA formatted disc)
(3) MP3/WMA
© 2006 Matsushita Electric Industrial Co. Ltd.. All rights reserved. Unauthorized copying and distribution is a violation of law.
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SA-AK640E / SA-AK640EB / SA-AK640EG
Bit rate
MP3, WMA 32 kbps to 320 kbps
Sampling frequency
MP3/WMA 32 kHz, 44.1 kHz, 48 kHz
CD-DA 44.1 kHz
Decoding 16 bit linear
Digital filter 8fs
D/A converter MASH (1 bit DAC)
Pick up
Wavelength 780 nm
Beam Source Semiconductor laser
udio output (Disc)
Number of channels 2 (Stereo) (FL,FR)
n GENERAL
Power supply
For E/EG only AC 230 V, 50Hz
For EB only AC 230 to 240 V, 50Hz
Power consumption 128 W
Power consumption in standby mode
Dimensions (W x H x D) 250 x 330 x 343 mm
0.5 W
Mass 7.1 kg
Operating temperature range +5 to +35°C
Operating humidity range 5 to 90% RH (no condensation)
n SYSTEM
SC-AK640 (E) Music center: SA-AK640 (E)
Speaker: SB-AK640 (EG)
Subwoofer: SB-W AK640 (EG)
SC-AK640 (EB) Music center: SA-AK640 (EB)
Speaker: SB-AK640 (EG)
Subwoofer: SB-W AK640 (EG)
SC-AK640 (EG) Music center: SA-AK640 (EG)
Speaker: SB-AK640 (EG)
Subwoofer: SB-W AK640 (EG)
For information on speaker system, please refer to the original Service Manual (Order No. MD0601006C2) for SB-AK640EG and (Order No. MD0601007C2) for SB-WAK640EG.
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
1.1. General Guidelines
1.2. Caution for AC Mains Lead
1.3. Before repair and adjustment
1.4. Protection Circuitry
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
3 Handling Precautions For Traverse Deck
4 Precaution of Laser Diode
5 Handling the Lead-free Solder
5.1. About lead free solder (PbF)
6 New Features
6.1. CRS1 Mechanism Overview
6.2. Music Port
7 Accessories
8 Operating Instructions Procedures
9 Self diagnosis and special mode setting
9.1. Special Mode Table
9.2. Error code Table
10 Assembling and Disassembling
10.1. Caution
10.2. Disassembly flow chart
10.3. Main Parts Location
10.4. Disassembly of Top Cabinet
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13
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18
22
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10.5. Disassembly of Rear Panel
10.6. Disassembly of CD Changer Unit (CRS1)
10.7. Disassembly of Main P.C.B.
10.8. Disassembly of Transformer P.C.B.
10.9. Disassembly of Power P.C.B.
10.10. Disassembly of Front Panel Unit
10.11. Disassembly for Panel P.C.B.
10.12. Disassembly of Deck mechanism unit
10.13. Disassembly of Deck P.C.B.
10.14. Disassembly of Traverse Unit
10.15. Disassembly of optical pickup unit (CD mechanism )
10.16. Disassembly of Deck Mechanism
10.17. Replacement for cassette lid
10.18. Rectification for tape jam problem
11 Service Fixture and Tools
12 Service Positions
12.1. Checking and Repairing of Main P.C.B.
12.2. Checking and Repairing of Transformer P.C.B.
12.3. Checking and Repairing of Panel, Deck & Deck
Mechanism P.C.B.
12.4. Checking and Repairing of Power P.C.B.
13 Adjustment Procedures
13.1. Cassette Deck Section
13.2. Tuner Section
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36
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SA-AK640E / SA-AK640EB / SA-AK640EG
14 Voltage and Waveform Chart 47
14.1. CD Servo P.C.B. & Main P.C.B.
14.2. Power P.C.B. & Transformer P.C.B.
14.3. Waveform Chart
15 Wiring Connection Diagram
16 Block Diagram
17 Schematic Diagram
17.1. Notes of Schematic Diagrams
17.2. (A) CD Servo Circuit
17.3. (B) Main (Tuner) Circuit
17.4. (B) Main Circuit
17.5. (C) Panel Circuit
17.6. (D) Transformer Circuit
17.7. (H) Power Circuit
17.8. (F) Deck Circuit & (G) Deck Mechanism Circuit
18 Printed Circuit Board
18.1. (A) CD Servo P.C.B.
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57
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59
61
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67
69
71
75
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18.2. (B) Main P.C.B.
18.3. (C) Panel P.C.B.
18.4. (D) Transformer P.C.B.
18.5. (E) Power P.C.B.
18.6. (F) Deck P.C.B. & (G) Deck Mechanism P.C.B.
19 Illustration of ICs, Transistors and Diodes
20 Terminal Function of IC's
20.1. IC7001 (MN6627954MA) Servo Processor,Digital Signal
Processor/Digital filter and D/A Converter
20.2. IC7002 (BA5948FPE2) IC 4CH Drive
20.3. IC2801 (C2CBYY000066) System Microprocessor
21 Exploded Views
21.1. Cabinet Parts Location
21.2. Deck Mechanism Parts Location (RAA4502-S)
21.3. Packaging
22 Replacement Parts List
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97
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SA-AK640E / SA-AK640EB / SA-AK640EG
1 Safety Precautions
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 expose d metallic cabine t 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
.
Fig. 1
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.
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1.2. Caution for AC Mains Lead
SA-AK640E / SA-AK640EB / SA-AK640EG
1.3. Before repair and adjustment
Disconnect AC power, discharge Power Capacitors C5101, C5104, C5171, C5172, C5920, C5940 and C5950 through a 10,5W
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SA-AK640E / SA-AK640EB / SA-AK640EG
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 240V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 350mA.
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.
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 handlin g 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 potent ial 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 exposu re 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 sufficie nt 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).
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SA-AK640E / SA-AK640EB / SA-AK640EG
3 Handling Precautions For Traverse Deck
The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by the static electricity of clothes or our human body.
So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
· Way of handling the 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. Do 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 for laser power adjustment. (It is pre-adjusted during production time)
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.
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SA-AK640E / SA-AK640EB / SA-AK640EG
4 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.
ACHTUNG :
Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheit abgestrahlt. Wellenlänge : 780nm Maximale Strahlungsleistung der Lasereinheit :100 µW/VDE Die Strahlung an der Lasereinheit ist ungefä hrlich, wenn folgende Punkte beachtet werden:
1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist.
2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.
3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.
4. Nicht über längere Zeit in die Fokussierlinse blicken.
ADVARSEL: I dette a apparat anvendes laser.
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 label
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SA-AK640E / SA-AK640EB / SA-AK640EG
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 solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please 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.
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SA-AK640E / SA-AK640EB / SA-AK640EG
6 New Features
6.1. CRS1 Mechanism Overview
6.1.1. General Feature
· This is a five disc changer mechanism for CD/DVD. The outline figure is shown below.
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SA-AK640E / SA-AK640EB / SA-AK640EG
· The mechanism has "CHANGE WHILE PLAY" function. It open other trays for disc exchanging while one tray is at PLAY position performing recording or reproducing.
· The mechanism can quickly change all trays with "CHANGE ALL" function. All trays can be move to OPEN position with one operation.
· There is no sensor to indicate presence of disc on any tray.
6.1.2. Hardware composition
· Below is the hardware components of the mechanism
Name Function
Open Switch (OPEN-SW) The switch is used to detect normal tray opening
The switch is used for detect tray being manually push/trigger when full open Home Switch (HOME-SW) Is used to detect cam gear home position Close Sensor (CLOSE-SENSOR) Used for normal single tray closing
Used to detect cam gear rotate to Play Driving position Play Switch (PLAY-SW) Detect TRV clamping complete position Stocking Switch (STOCK-SW) Detect tray completely transfer for play position to stocking position UD Sensor (UD-SENSOR) Detect TRV vertical movement position Top Switch (TOP-SW) Detect a default position of TRV vertical movement position Driver IC To drive Motor Motor Main driving source for changer Plunger Switching the driving source from motor to:
1. Tray open/close
2. Drive tray to play/stock position and TRV vertical movement
6.1.3. Mechanism Operation
· This mechanism has the following state:
1. Driving of a tray to open/close
2. Up/down operation of a traverse performs a state changes of tray.
By using the plunger to lift/release of a switching gear, and the cam gear to lift/release the function gear the motor can be link to several gear trains to perform various operations.
· The functions that can be perform in this mechanism are described as below:
Condition Explanation
Open current playing tray The state to change current playing disc. All tray will be open at once and current tray at PLAY position
Open All The state where all trays being driven to OPEN position. The disc can be taken in or out from tray to tray
Stock The state where the trays are stored in STOCK position Play The state where one of the tray 5 trays is being driven to PLAY position and clamped by traverse unit Play & Open Tray-* The state where one of the tray is in playing position performing recording or reproducing, other trays can
Change The state when one of the opened tray being driven from OPEN position to STOCK position and other
Close All The state where all open trays will being driven from OPEN position to STOCK position, one by one from
will be expose.
by close tray one by one from top to bottom.
be used (OPEN position) for disc exchanging without stopping the recording or reproducing process.
opened trays remain still at OPEN position.
top to bottom
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SA-AK640E / SA-AK640EB / SA-AK640EG
Note: * represent tray number (from 1 ~ 5)
6.1.4. New CD Mechanism (CRS1)
Note:
This service manual does not contain the following information for the mention CD Mechanism drive:
· Schematic Diagram, Block Diagram and P.C.B. layout of CD Loading P.C.B.
· Part List for individual parts of the mechanism.
· Explode d View and Parts List for individual parts of the CD Mechanism drive.
Please refer to the original service manual (Order No. MD0509368C0) for the CD Mechanism Drive CRS1.
6.2. Music Port
With reference to page 16 of the operating instruction manual.
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7 Accessories
SA-AK640E / SA-AK640EB / SA-AK640EG
Remote Control
FM Antenna Wire
AC Cord (For E/EG
only)
AC Cord (For EB
only)
AM Loop Antenna
Antenna
Adaptor (For EB
only)
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SA-AK640E / SA-AK640EB / SA-AK640EG
8 Operating Instructions Procedures
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SA-AK640E / SA-AK640EB / SA-AK640EG
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SA-AK640E / SA-AK640EB / SA-AK640EG
9 Self diagnosis and special mode setting
This unit is equipped with functions for checking and inspecting namely: Self-Diagnostic and Test Mode.
9.1. Special Mode Table
Item FL Display Key Operation
Mode Name Description Front Key
Self -Diagnostic
Mode
CD Test Mode To enter into checking the
CD Auto
Adjustment
To enter into self diagnostic checking for main unit.
reliability of changer unit.
To check the CD auto adjustment result for FLOCK, TLOCK and CLVS.
1. Select [
] for TAPE mode (Ensure no tape is inserted).
2. Press and hold [ seconds follow by [
To exit, press main unit or remote control.
1. Select [ ] for CD mode.
2. Press and hold [ seconds follow by [
To exit, press main unit or remote control.
In CD Test Mode:
1. Press [0] button on the remote control.
To exit, press main unit or remote control.
]button for 3
].
button on
] button for 3
].
button on
button on
CD Changer
Reliability Test
(CRS1)
Doctor Mode To enter into Doctor
Cold Start To activate cold start
Changer
Reliability Test
To determine the reliability of CD Changer Unit. (For more information, refer to section 9.1.1)
Mode for checking of various items and displaying EEPROM and firmware version.
upon next AC power up.
To check the function operation of changer unit. (For more information, refer to 9.1.1)
1.
2.
1. All segments will light up for 1 second.
2. The Check Sum of EEPROM and firmware version will be display.
* ROM correction ** Firmware version No:
In Self-Diagnostic Mode:
1. Select [
2. Press [
To exit, press main unit or remote control. (The tray will return to PLAY position and then power off)
In any mode:
1. Press [ follow by [4] and [7] on remote control.
To exit, press [ENTER] button on remote control or unit or remote control.
In doctor mode:
1. Press [4] button on remote control.
To exit, press [ENTER] button on remote control or unit or remote control.
In doctor mode:
1. Press [DISC] on remote control.
To exit, press [ENTER] button on remote control or unit or remote control.
] for CD mode.
] button.
button on
] button on main unit
button on main
button on main
button on main
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Item FL Display Key Operation
Mode Name Description Front Key
FL Display Test To check the FL
segments display (All segments will light up and LED will blink at 0.5 second interval)
Tape Eject Test To check on the tape
eject function (For deck 1/2)
In doctor mode:
1. Press [DIMMER] button on remote control.
In doctor mode:
1. Press [PROGRAM] button on remote
9.1.1. CD changer unit ageing test mode
Below is the process flow chart of ageing for the CD changer unit. (CRS1)
SA-AK640E / SA-AK640EB / SA-AK640EG
control.
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SA-AK640E / SA-AK640EB / SA-AK640EG
9.2. Error code Table
Self-Diagnosis Function (refer Section 9.1) provides information on any problems occuring for the unit and its respective components by display ing the error codes. These error code such as U**, H** and F** are stored in memory and held unless it is cleared.
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The error code is automatically display after entering into self-diagnostic mode.
Error Code Diagnosis Contents Description of error Automatic FL Display Remarks
H01 Mode SW, plunger
and capstan motor abnormal
For deck mechanism unit (For deck 1/2). Press [ next error.
SA-AK640E / SA-AK640EB / SA-AK640EG
] on main unit for
H02 Rec INH SW
abnormal
For deck mechanism unit (For deck 2). Press [
] on main unit for
next error.
H03 HALF SW abnormal For deck mechanism unit (For deck 1/2).
Press [
] on main unit for
next error.
F01
Reel pulse abnormal
For deck mechanism unit (For deck 1/2). Press [
] on main unit for
next error.
F02
F15 RESET SW
F26 Transmission error
TPS error
abnormal
between CD Servo LSI IC and microprocessor IC
REST SW: ON is not detected within the specified time.
When set to CD mode, the sense signal does not turn “Low”, a fail safe time after system
For CD unit (For Traverse). Press [
] on main unit for
next error.
For CD unit (For Traverse). Press [
] on main unit for
next error.
command transmission is sent.
F61 Power Amp IC output
abnormal
Upon power on, PCONT=HIGH, DCDET=L after checking
For power. Press [ next error.
] on main unit for
LSI.
IHMS Cam gear
abnormality
Cam gear does not rotate to “HOME” position.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
ICSL Cam gear/gear units
abnormal
ISTK Drive rack/gear
assembly abnormal
IPLY Drive rack/gear
assembly abnormal
Cam gear does not rotate to “PLAY” driving position and hence does not drive playing tray to “STOCK” position.
The tray drive rack does not move to “STOCK” position. (Tray does not move to “STOCK” position)
The tray drive rack does not move to “PLAY” position. (Tray does not move to “PLAY” position)
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
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SA-AK640E / SA-AK640EB / SA-AK640EG
Error Code Diagnosis Contents Description of error Automatic FL Display Remarks
ITOP UD assembly UD Rack does not move
to front direction. This lead to UD base not raise to top position.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
IUDS UD assembly After TOP SW is
detected, UD rack does not move into tray 1 position.
HOME Cam gear/gear
assembly abnormal
Cam gear does not move to “HOME” position under following conditions
1. After tray is load to “PLAY” position.
2. After tray is unload to “STOCK” position.
LOAD Tray drive assembly
abnormal
Tray unit does not move from “STOCK” to “PLAY” position
PDRV Cam gear/gear
assembly abnormal
Cam gear does not move from “HOME” to “PLAY” drive position.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
UDU UD base asssembly
abnormal
UDD UD base asssembly
abnormal
UD1 UD base asssembly
abnormal
F1NG Fail - safe mode. (For
open/close tray unit(s))
F2NG Fail - safe mode. (For
open/close tray unit(s))
UD Base assembly does not move upwards from tray 5 to tray 2
UD Base assembly does not move downwards from tray 1 to tray 5.
UD Base assembly does not move to tray 1.
When the tray open operation is performed, it fails to open. It will automatically close all trays after the time-out by the microprocessor. During this time when it fails, the error code will appear.
When the tray close operation is performed, it fails to close. It will automatically open all trays after the time-out by the microprocessor. During this time when it fails, the error code will appear.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
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SA-AK640E / SA-AK640EB / SA-AK640EG
Error Code Diagnosis Contents Description of error Automatic FL Display Remarks
SRVC_TRV To unlock the
traverse unit for service
RSET Cam gear jam/close
sensor faulty
1. All trays set to “STOCK” position
2. Mechanism set to tray 5
3. Cam gear set to “HOME” position
During tray re-open, the cam gear will rotate in the opposite direction to reset the cam gearposition. When it fails, the error code will appear.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit.
For CD changer unit (CRS1). Press [SINGLE CHANGE] on main unit for next error.
CRS1 Error Code display
1. The errors that occured in CRS1 Mechanism can be recalled and displayed, in the order of the occurence under self-diagnostic (Refer to Section 9.1 for procedures to enter this mode.
· Only the first 5 errors will be memorized (in backup memory). The subsequence error shall be ignored and not memorize.
For system with EEPROM as memory backup,memory space in EEPROM is neccesary.
2. To display all error code memorized
In CRS1 Self-Diagnostic mode, press [SINGLE CHANGE] to display subsequence error code.
It shall repeat after reaching error no. 5.
e.g.:
[1____IHMS][SINGLE CHANGE]
[2____ITOP][SINGLE CHANGE]
[3____HOME][SINGLE CHANGE]
[4____LOAD][SINGLE CHANGE]
[5_____UDD][SINGLE CHANGE]
3. To clear the error code memory
In CRS1 Self-Diagnostic mode, long press [SINGLE CHANGE] key (2s or more)
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SA-AK640E / SA-AK640EB / SA-AK640EG
10 Assembling and Disassembling
10.1. Caution
Special Note:
This model uses a new CD changer unit CRS1. In this following section does not contain the necessary disassembly & assembly information for the CD changer unit (CRS1) except the disasembly & assembly of traverse unit. Kindly refer to the original service manua l for the CD changer unit. (Order No. MD0509368C0).
“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 22), if necessary.
Warning :-
This product uses a laser diode. Refer to caution statement Precaution of Laser Diode.
Caution:
After replacing of CD Changer Unit, ageing test is necessary. Please confirm operation for CD Changer Unit.
Below is the list of disassembly sections
· Disasse mbly of Top Cabinet
· Disasse mbly of Rear Panel
· Disasse mbly of CD Changer Unit
· Disasse mbly of Main P.C.B.
· Disasse mbly of Transformer P.C.B.
· Disasse mbly of Power P.C.B.
· Disasse mbly of Front Panel Unit
· Disasse mbly of Panel P.C.B.
· Disasse mbly of Deck Mechanism Unit
· Disasse mbly for Deck P.C.B.
· Disasse mbly of Traverse Unit
· Disasse mbly of Optical Pickup Unit (CD Mechanism)
· Disasse mbly of Deck Mechanism
· Replacement for casse tte lid
· Rectification for tape jam problem
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SA-AK640E / SA-AK640EB / SA-AK640EG
10.2. 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.
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SA-AK640E / SA-AK640EB / SA-AK640EG
10.3. Main Parts Location
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10.4. Disassembly of Top Cabinet
Step 1 Remove 3 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 to remove the top cabinet.
SA-AK640E / SA-AK640EB / SA-AK640EG
10.5. Disassembly of Rear Panel
· Follow the (Step 1) - (Step 2) of Item 10.4 - Disassembly of Top Cabinet
Step 1 Remove 6 screws.
Step 2 Disconnect cable CN2810 (Fan) at Main P.C.B..
Step 3 Remove rear panel.
10.6. Disassembly of CD Changer Unit (CRS1)
· Follow the (Step 1) - (Step 2) of Item 10.4 - Disassembly of Top Cabinet
Step 1 Remove 1 screw at rear panel.
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SA-AK640E / SA-AK640EB / SA-AK640EG
Step 2 Detach the FFC cables (CN2801 & CN2805).
Step 4 Lift the CD changer unit upwards to remove it.
· Disasse mbly of Mecha Chassis
Step 3 Release the claws on both ends.
Step 5 Remove 2 screws.
Step 6 Remove the Mecha Chassis.
Note:
For disassembly & assembly of traverse unit, please refer to section 10.14 of this service manual.Please refer to original Service Manual for the Disassembly and Assembly of the CD Changer Unit (CRS1).
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10.7. Disassembly of Main P.C.B.
· Follow the (Step 1) - (Step 2) of Item 10.4 - Disassembly of Top Cabinet
· Follow the (Step 1) - (Step 4) of Item 10.6 - Disassembly of CD Changer Unit
· Follow the (Step 1) - (Step 3) of Item 10.5 - Disassembly of Rear Panel
Step 1 Disconnect FFC cables (CN2803, CN280 6 and CN2951).
Step 2 Detach connectors (CN2808 & CN2809).
Step 3 Remove Main P.C.B..
SA-AK640E / SA-AK640EB / SA-AK640EG
10.8. Disassembly of Transformer P.C.B.
· Follow the (Step 1) - (Step 2) of Item 10.4 - Disassembly of Top Cabinet
· Follow the (Step 1) - (Step 3) of Item 10.5 - Disassembly of Rear Panel
· Follow the (Step 1) - (Step 4) of Item 10.6 - Disassembly of CD Changer Unit
Step 1 Disconnect connectors (CN5950 & CN595 1).
Step 2 Remove 3 screws (Mounting screws for transformer to
bottom chassis).
Step 3 Push the Transformer P.C.B. sidewards to remove it.
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SA-AK640E / SA-AK640EB / SA-AK640EG
10.9. Disassembly of Power P.C.B.
· Follow the (Step 1) - (Step 2) of Item 10.4 - Disassembly of Top Cabinet
· Follow the (Step 1) - (Step 4) of Item 10.6 - Disassembly of CD Changer Unit
· Follow the (Step 1) - (Step 3) of Item 10.5 - Disassembly of Rear Panel
· Follow the (Step 1) - (Step 3) of Item 10.7 - Disassembly of Main P.C.B.
Step 1 Remove the 5 screws on Power P.C.B..
Step 2 Detach cable (CN5950) remove the 5 screws on Power
P.C.B..
Step 3 Remove Power P.C.B..
Note:
Insulate the Power P.C.B. with insulation material to avoid short circuit.
· Replacement of the Power Amp IC or Voltage Regulator
Step 4 Remove 2 screws at the Power Amp IC and/or 3
screws to Voltage Regulator.
Step 5 Cut the joints with a metal cutter as shown below.
Step 6 Desolder the terminals to replace the components.
Step 7 Fix back the cut portion with a screw as shown.
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10.10. Disassembly of Front Panel Unit
· Follow the (Step 1) - (Step 2) of Item 10.4 - Disassembly of Top Cabinet
· Follow the (Step 1) - (Step 4) of Item 10.6 - Disassembly of CD Changer Unit
Step 1 Disconnect connectors (CN2803, CN2806, CN2951, CN5950 & CN5951).
Step 3 Release 2 claws outwards.
SA-AK640E / SA-AK640EB / SA-AK640EG
Step 2 Bent the front panel unit slightly forward as arrow
shown.
Step 4 Remove the front panel unit.
Note: Ensure 2 claws located at the bottom chassis is seated
into the 2 slots at bottom of front panel at 2 catches (one on each side) of bottom chassis to be aligned to front panel’s slot. Assembly is secured upon hearing clicking sound.
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SA-AK640E / SA-AK640EB / SA-AK640EG
10.11. Disassembly for Panel P.C.B.
· Follow the (Step 1) - (Step 2) of Item 10.4 - Disassembly of Top Cabinet
· Follow the (Step 1) - (Step 4) of Item 10.6 - Disassembly of CD Changer Unit
· Follow the (Step 1) - (Step 4) of Item 10.10 - Disassembly of Front Panel Unit
Step 1 Remove the volume knob.
Step 2 Remove Lid.
Note: Do not misplace the spring.
Step 2 Remove 12 screws.
Step 3 Release 2 catches.
Step 4 Remove Panel P.C.B..
10.11.1. Disassembly of Lid
Step 1 Lift the spring sideward.
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