Panasonic SA-AK331GCP User manual

nAMPLIFIER SECTION
RMS output power
THD 10%, both channels driven
1 kHz,
(Low channel) 90 W per channel (5 Ω)
10 kHz,
(High channel) 90 W per channel (5 Ω)
Total Bi-Amp power 360 W
nFM/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
A
ntenna terminal(s) 75 Ω(unbalanced)
A
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
A
udio performance (Amplifier)
Input sensitivity/Input impedance
A
ux 250 mV,14.7 kΩ
Phone jack
Terminal Stereo, 3.5 mm jack
©2004 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-AK331GCP
Colour
(S)... Silver Type
Mic jack
Terminal 0.7mV, 680 Ω
Mono, 3.5 mm
nCASSETTE 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 50 dB (A weighted)
Wow and flutter 0.18 % (WRMS)
Fast forward and rewind time Approx. 120 seconds with
C-60 cassette tape
nDISC SECTION
Discs played [8 cm or 12 cm]
(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3 formatted discs)
(3) MP3
Bit rate
MP3 32 kbps - 320 kbps
Sampling frequency
MP3 32 kHz, 44.1 kHz, 48 kHz
CD Stereo System
Specifications
ORDER NO. MD0412582C3

CD 44.1 kHz
Decoding 16 bit linear
Digital filter 8fs
D/A converter MASH (1 bit DAC)
Pickup
Wavelength 780 nm
Beam Source Semiconductor laser
A
udio output (Disc)
Number of channels 2(Stereo)(FL,FR)
nGENERAL
Power Supply AC 110-127/220-240 V, 50/60 Hz
Power consumption 255 W
1 Before Use 4
2 Before Repair and Adjustment 4
3 Protection Circuitry 4
4 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 4
5 Handling the Lead-free Solder 5
5.1. About lead free solder (PbF) 5
6 Handling Precautions For Traverse Deck 6
7 Precaution of Laser Diode 7
8 Accessories 8
9 Operation Procedures 9
10 Disassembly and Assembly of Main Component 11
10.1. Disassembly flow chart 11
10.2. Gear for servicing (jig) Information 12
10.3. Disassembly of Top Cabinet 13
10.4. Disassembly of CD Lid 13
10.5. Disassembly of Rear Panel 15
10.6. Disassembly of CD Mechanism Unit 15
10.7. Disassembly of Main P.C.B. 16
10.8. Disassembly of Power P.C.B. 16
10.9. Disassembly of Transformer P.C.B. 17
10.10. Disassembly of Front Panel Unit 18
10.11. Disassembly of Deck Mechanism Unit 18
10.12. CD Mechanism Main Component Replacement
Procedures 19
10.13. Replacement for the pinch roller ass 馳and head block 32
10.14. Replacement for the Deck motor ass 馳, capstan belt A,
capstan belt B and winding belt 33
10.15. Replacement for the cassette lid ass 馳36
10.16. Rectification for tape jam problem 37
11 Checking for major P.C.Bs 38
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)
nSYSTEM:
SC-AK331 (GCP) Music center: SA-AK331 (GCP)
Speaker: SB-AK330 (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.
11.1. Checking of Main P.C.B. 38
11.2. Checking of Transformer P.C.B. 39
11.3. Checking of Panel, Deck & Deck Mechanism P.C.B. 40
11.4. Checking of Power P.C.B. 41
12 Self-Diagnostic Function 42
12.1. Self-diagnostic display 42
12.2. How to enter the Self-Diagnostic Function 42
12.3. Cassette Mechanism Test (For error code H01, H02, H03,
F01) 42
12.4. CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29,
F30, H15 & H16) 42
12.5. To clear all Error code 43
12.6. To exit from Self-Diagnostic function 43
12.7. Power Amplifier Failure (F61) 43
12.8. Description of Error Code 43
13 CD Test Mode Function 45
13.1. How to set CD test mode 45
13.2. CD Automatically Adjustment result indication 45
13.3. CD Mecha Aging Test Mode (CR20) 45
13.4. Micon ROM Checksum and Version Display Mode 46
14 Measurements and Adjustments 47
14.1. Cassette Deck Section 47
14.2. Tuner Section 47
14.3. Alignment Points 48
15 Block Diagram 49
16 Voltage Measurement 56
17 Schematic Diagram 58
17.1. (A) CD Servo Circuit 59
17.2. (B) Main (Tuner) Circuit 61
17.3. (B) Main Circuit 62
17.4. (C) Panel Circuit 67
CONTENTS
Page Page
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SA-AK33 1GCP

17.5. (D) Transformer Circuit, (E) CD Detect Circuit, (F) Spindle
Position Circuit & (G) CD Loading Circuit 69
17.6. (H) Power Circuit 70
17.7. (I) Deck Circuit & (J) Deck Mechanism Circuit 71
18 Printed Circuit Board 73
18.1. (A) CD Servo P.C.B. 73
18.2. (B) Main P.C.B. 74
18.3. (C) Panel P.C.B. 76
18.4. (D) Transformer P.C.B. 78
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. 79
18.6. (H) Power P.C.B. 80
18.7. (I) Deck P.C.B. & (J) Deck Mechanism P.C.B. 82
19 Wiring Connection Diagram 83
20 Illustration of IC 痴, Transistors and Diodes 84
21 Terminal Function of IC 痴85
21.1. IC7002 (MN6627953HB) Servo processor/ Digital signal
processor/ Digital filter/ D/A converter 85
21.2. IC7003 (AN8739SBTE2) Focus coil/ Tracking coil/
Traverse motor/ Spindle motor drive 85
21.3. IC2801 (C2CBJG000564) System Microprocessor 86
22 Troubleshooting Guide 87
23 Parts Location and Replacement Parts List 88
23.1. Deck Mechanism (RAA3412-S) 89
23.2. CD Loading Mechanism (RD-DAC026-S) 92
23.3. Cabinet 95
23.4. Electrical Parts List 97
23.5. Packing Materials & Accessories Parts List 105
23.6. Packaging 106
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SA-AK33 1GCP

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 consumption at AC 110-127/220-240 V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~650mA.
3 Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
· No sound is heard when the power is turned on.
· Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note :
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
4 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
Electrostatica lly 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-propell ed 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
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SA-AK33 1GCP

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 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).
· When 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-AK33 1GCP

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.
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SA-AK33 1GCP

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.
nUse of Caution Labels
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SA-AK33 1GCP

8 Accessories
Remote Control
FM Antenna
AC Cord
AM Loop Antenna
AC Plug Adaptor
8
SA-AK33 1GCP

9 Operation Procedures
9
SA-AK33 1GCP

10
SA-AK33 1GCP

10 Disassembly and Assembly of Main Component
“ATTENTION SERVICER”
Some chassis components may have sharp edges. Be careful when disassemblin g 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 disassemblin g 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-AK33 1GCP

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.
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SA-AK33 1GCP

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 cabinet.
Step 1 Connect the AC power cord.
Step 2 Press the POWER button to power up the main unit.
Step 3 Press the OPEN/CLOSE button, the disc tray will open
automatically .
Step 4 Release the 2 claws, and then remove the CD Lid.
Step 5 Press the OPEN/CLOSE button, the disc tray will close.
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)
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SA-AK33 1GCP

Step 6 Press the POWER button to turn the power off.
· [Opening the disc tray manually (Using service tools)]
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 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 4 The disc tray will be closed.
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SA-AK33 1GCP

Step 1 Remove 8 screws and disconnect wire CN2810 (Fan) at
rear cabinet as shown.
Step 1 Remove one screw at rear panel.
Step 2 Detach the FFC wires (CN2801 & CN2805).
Step 3 Release the claws of both ends, and then lift up the CD
Mechanism Unit.
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 10.12 of this manual.
10.5. Disassembly of Rear Panel
· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
10.6. Disassembly of CD Mechanism Unit
· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
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SA-AK33 1GCP

Step 1 Disconnect FFC wires CN2803 & CN2806 from Main
P.C.B.
Step 1 Remove the 2 screws fixed at heat sink and 1 screw
fixed at Power P.C.B..
Note:
Insulate the Power P.C.B. with insulation material to avoid short
circuit.
Step 2 Lift up Main P.C.B. by disconnecting connectors
CN5800 & CN5801 as arrow shown above.
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
10.8. 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.
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SA-AK33 1GCP

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 1 Remove 3 screws, disconnect connector CN5950.
Step 3 Unsolder the terminals of Power Amp IC, transistor and
replace the components.
Step 4 Fix back the cut portion with a screw as shown.
· Replacement of the Power Amplifier IC/ Voltage Regulator
10.9. Disassembly of Transformer 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
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SA-AK33 1GCP

Step 1 Lay the unit as shown below.
Step 2 Release 2 claws at bottom and 2 claws each side, draw
the front panel ass’y forward.
Step 3 Remove volume knob.
· Disassembly of Panel P.C.B.
Step 1 Detach FFC wire (CN971).
Step 2 Disconnect FFC flat cable from the connector
(CN1001).
Step 3 Remove the 5 screws.
Step 4 Remove 10 screws.
Step 5 Disconnect connectors (CN2806, CN2803 and
CN5950).
Step 4 Push the lever upward, and then open the cassette lid
ass’y (For DECK1 and DECK2).
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.
10.10. 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) of Item 10.5 - Disassembly of Rear Panel
· Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit
10.11. 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 10.10 - Disassembly of Front Panel Unit
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SA-AK33 1GCP

Step 7 Unsolder the motor terminals.
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.
Step 8 Remove Deck Mechanism P.C.B.
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).
10.12. 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
10.12.1. Replacement of the Traverse Deck
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SA-AK33 1GCP

Step 6 Lift up the traverse deck ass’y.
Step 7 Remove the traverse deck ass’y from the timing lever.
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 10 Remove the FFC board from the connector, and then
remove the CD Servo P.C.B.
Step 11 Remove the pin.
Step 12 Release the claw, and then remove the traverse deck
ass’y.
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SA-AK33 1GCP