Panasonic SA-AK220GCP User manual

nAMPLIFIER SECTION
RMS Power output
THD 10%, both channels driven
1 kHz 80 W per channel (6 Ω)
Total Bi-Amp power 160 W per channel
Input sensitivity
A
UX 250 mV
Input Impedance
A
UX 13.3 kΩ
nFM TUNER SECTION
Frequency range
87.50 - 108.00 MHz (50 kHz steps)
Sensitivity 2.5µV (IHF)
S/N 26 dB 2.2 µV
A
ntenna terminal(s) 75 Ω(unbalanced)
nAM TUNER SECTION
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
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
©2004 Panasonic AVC Networks Singapore Pte.
Ltd. All rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-AK220GCP
Colour
(S)... Silver Type
Erasing system AC erase 100 kHz
Tape speed 4.8 cm/s
Overall frequency response (+3 dB, -6 dB at DECK OUT)
NORMAL (TYPE I) 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
nCD SECTION
Sampling frequency 44.1 kHz
Decoding 16 bit linear
Beam source/wavelength Semiconductor laser/780 nm
Number of channels Stereo
Frequency response 20 Hz - 20 kHz (+1, -2 dB)
Wow and flutter Below measurable limit
Digital filter 8fs
D/A converter MASH (1 bit DAC)
MP3
Bit rate 32 kbps - 320 kbps
Sampling frequency 32 kHz, 44.1 kHz, 48 kHz
nGENERAL
Power Supply AC 110/ 127/ 220-230/ 240 V,
50/ 60 Hz
Power consumption 179 W
Power consumption in standby
mode
0.85 W
Dimensions (W x H x D) 250 x 330 x 363 mm
CD Stereo System
Specifications
ORDER NO. MD0403067C3

Mass 7.5 kg
nSYSTEM
SC-AK220 (GCP) Music center: SA-AK220 (GCP)
Speaker: SB-AK220 (P)
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 10
10.1. Disassembly flow chart 10
10.2. Disassembly of Top Cabinet and Rear Panel 11
10.3. Disassembly of CD Mechanism Unit 13
10.4. Disassembly Main P.C.B., Transformer P.C.B., Voltage
Selector P.C.B. & Power P.C.B. 14
10.5. Disassembly of Panel P.C.B. & Tact Switch P.C.B. 15
10.6. Disassembly of Deck Mechanism Unit & Deck P.C.B. 16
10.7. CD Mechanism Main Component Replacement
Procedures 16
10.8. Replacement for the pinch roller ass 馳and head block 29
10.9. Replacement for the Deck motor ass 馳, capstan belt A,
capstan belt B and winding belt 30
10.10. Replacement for the cassette lid ass 馳33
10.11. Counter- measure for tape trouble 33
11 Service Position 34
11.1. Checking Procedure 34
11.2. Checking the Main P.C.B., Power P.C.B., Transformer
P.C.B. and Voltage Selector P.C.B. 34
11.3. Checking the Panel P.C.B., Tact Switch P.C.B., Deck
P.C.B. & Deck Mechanism P.C.B. 35
12 Description of Error Code 36
12.1. Abnormality detection for Deck Mechanism block 36
12.2. Abnormality detection for CD/Changer block 36
12.3. Power supply related error detection 36
13 Self-Diagnostic Function 37
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.
3. The labels “HIGH” and “LOW” on the rear of the speakers refer
to High frequency and Low frequency.
13.1. Self-diagnostic display 37
13.2. How to enter the Self-Diagnostic Function 37
13.3. Cassette Mechanism Test (For error code H01, H02, H03,
F01, F02) 37
13.4. CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29,
H15) 38
13.5. To clear all Error code 38
13.6. How to get out from Self-Diagnostic function 38
13.7. Power Amplifier Failure (F61) 38
14 CD Test Mode Function 39
14.1. How to set CD test mode 39
14.2. CD Automatically Adjustment result indication 39
15 Measurements and Adjustments 40
15.1. Cassette Deck Section 40
15.2. Tuner Section 40
15.3. Alignment Points 41
16 Block Diagram 42
17 Schematic Diagram 49
17.1. (A) CD Servo Circuit 50
17.2. (B) Tuner/Main Circuit 52
17.3. (B) Main Circuit 53
17.4. (C) Panel Circuit & (D) Tact Switch Circuit 58
17.5. (F) CD Detect Circuit, (G) Spindle Position Circuit & (H)
CD Loading Circuit 60
17.6. (E) Transformer Cuircuit & (L) Voltage Selector Circuit 61
17.7. (I) Power Circuit 62
17.8. (J) Deck Circuit & (K) Deck Mechanism Circuit 63
18 Printed Circuit Board 65
18.1. (A) CD Servo P.C.B. (Side A & Side B) 65
18.2. (B) Main P.C.B. 67
18.3. (C) Panel P.C.B. 69
18.4. (D) Tact P.C.B. & (M) Voltage Selector P.C.B. 71
18.5. (E) Transformer P.C.B. 72
18.6. (F) CD Detect P.C.B., (G) Spindle Position P.C.B., (H) CD
Loading P.C.B. & (L) Tuner Pack P.C.B. 74
18.7. (I) Power P.C.B. 75
18.8. (J) Deck P.C.B. & (K) Deck Mechanism P.C.B. 77
CONTENTS
Page Page
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SA-AK220GCP

19 Wiring Connection Diagram 78
20 Illustration of IC 痴, Transistors and Diodes 79
21 Terminal Function of IC 痴80
21.1. IC701 (AN22004A-NF) Servo Amplifier 80
21.2. IC702 (MN6627934CH) Servo Processor/ Digital Signal
Processor/ Digital Filter/ D/A Converter 80
21.3. IC703 (AN8739SBTE2) Focus Coil/ Tracking Coil/
Traverse Motor/ Spindle Motor Driver 81
21.4. IC305 (C2CBJF000017) System Microprocessor 81
22 Troubleshooting Guide 83
23 Parts Location and Replacement Parts List 84
23.1. Deck Mechanism (RAA4502-S) 85
23.2. CD Loading Mechanism (RD-DAC026-S) 88
23.3. Cabinet 91
23.4. Electrical Parts List 94
23.5. Packing Materials & Accessories Parts List 102
23.6. Packaging 103
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SA-AK220GCP

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 C520 and C540 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 110V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode), should be ~ 500mA & at AC 220V-
230V, 50 Hz 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 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
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
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SA-AK220GCP

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 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-AK220GCP

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. The short land between the No.4(LD) and No.5(GND) pins on the flexible board (FFC) is shorted with a solder build-up to
prevent damage to the laser diode.To connect to the PC board, be sure to open by removing the solder build-up, and finishthe
work quickly.
3. Take care not to apply excessive stress to the flexible board (FFC).
4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.
Fig 6.1
· Grounding for electrostatic breakdown prevention
1. Human body grounding
Use the anti-static wrist strap to discharge the static electricity from your body.
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is placed, and ground
the sheet.
Caution :
The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the
traverse deck (optical pickup).
Caution when Replacing the Traverse Deck :
The traverse deck has a short point shorted with solder to protect the laser diode against electrostatic breakdown. Be sure to
remove the solder from the short point before making connections.
Fig 6.2
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SA-AK220GCP

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-AK220GCP

8 Accessories
Remote Control
Transmitter
FM Indoor Antenna
AC Power Supply Cord
AM Loop Antenna
Power Plug Adaptor
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SA-AK220GCP

9 Operation Procedures
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SA-AK220GCP

10 Disassembly and Assembly of Main Component
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.
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SA-AK220GCP

Step 1 Remove 3 screws each side and 5 screws at rear panel.
Step 2 Lift up both sides of top cabinet, push the cabinet ass’y
toward the rear and remove it.
· Disassembly of Rear Panel
Step 3 Remove 6 screws.
Step 4 Draw rear panel forward.
10.2.1. Disassembly for CD Lid
(The CD changer unit can be removed after the CD Lid is
removed)
· Follow the (Step 1) - (Step 5) of Item 10.2 - Disassembly of
Top Cabinet and Rear Panel
When 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 3 Press the OPEN/CLOSE button, the disc tray will be
open automatically.
Step 4 Release the 2 claws, and then remove the CD Lid.
10.2. Disassembly of Top Cabinet and Rear Panel
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SA-AK220GCP

Step 5 Press the OPEN/CLOSE button, the disc tray will be
close.
[Open 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 open.
Step 2 Release the 2 claws, and then remove the CD lid cover.
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SA-AK220GCP

Step 3 Repeat Step 2 but rotate the gear tools in anti-clockwise
Step 1 Detach the FFC boards (CN309 & CN310).
Step 2 Release the claws of both ends, and then lift up the CD
Mechanism Unit.
direction.
Step 4 The disc tray will be close.
Step 3 Remove 4 screws.
Step 4 Remove the CD chassis.
Step 5 Lay the CD mechanism unit as shown.
· Note:
For disassembly of CD mechanism unit, please refer to
Section 10.7 of this manual.
10.3. Disassembly of CD Mechanism Unit
· Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly of Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly for CD Lid
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SA-AK220GCP

10.4.1. Disassembly for the Main P.C.B.
· Follow the (Step 1) - (Step 5) of Item 10.2 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 10.3 - Disassembly of
the CD Mechanism Unit
Step 1 Disconnect FFC board at CN303, CN302 & CN304 .
Step 2 Lift up Main P.C.B. by disconnect CN500 & CN501 as
arrow shown above.
10.4.2. Disassembly of the Transformer
P.C.B. & Voltage Selector P.C.B.
· Follow the (Step 1) - (Step 5) of Item 10.2 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 10.3 - Disassembly of
the CD Mechanism Unit
Step 1 Remove 3 screws.
Step 2 Disconnect connector CN950.
10.4.3. Disassembly of the Power P.C.B.
· Follow the (Step 1) - (Step 5) of Item 10.2 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 10.3 - Disassembly of
the CD Mechanism Unit
· Follow the (Step 1) - (Step 2) of Item 10.4.1 - Disassembly
for the Main P.C.B.
Step 1 Remove 2 screws.
Step 2 Remove the 2 screws fixed at heat sink.
NOTE:
Insulate Power P.C.B. with insulation material to avoid short
circuit.
· Replacement of Power Amplifier IC & Voltage Regulator
Step 1 Remove 2 screws (For Power Amp IC) and 1 screw (For
Voltage Regulator) .
Step 2 Break the joint with a metal cutter as shown below.
10.4. Disassembly Main P.C.B., Transformer P.C.B., Voltage Selector P.C.B.
& Power P.C.B.
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SA-AK220GCP

Step 3 Unsolder the terminals of Power Amp IC, transistor and
replace the components.
· Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 10.3 - Disassembly of
the CD Mechanism Unit
· Disassembly of Panel P.C.B.
Step 1 Lay the unit as shown below.
Step 2 Remove 2 screws, release 2 claws, and then draw the
front panel ass’y forward.
Step 4 Fix back the cutted portion with a screw as shown.
Step 3 Remove the 8 screws.
Step 4 Disconnect FFC board (CN302).
· Disassembly of Tact Switch P.C.B.
Step 5 Disconnect connector CN900.
10.5. Disassembly of Panel P.C.B. & Tact Switch P.C.B.
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SA-AK220GCP

· Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of
the CD Mechanism Unit
Step 1 Detach FFC board. (CN971)
Step 2 Disconnect FFC flat cable from the connector
(CN1001).
Step 3 Remove the 5 screws.
· Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 10.3 - Disassembly of
the CD Mechanism Unit
10.7.1. Replacement of the Traverse Deck
Step 1 Remove the CD changer unit.
Step 6 Pull out the volume knob.
Step 7 Pull Panel P.C.B. forward.
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 P.C.B.
Step 6 Unsolder the motor terminals.
Step 7 Remove 3 screws.
Step 8 Remove Deck P.C.B.
10.6. Disassembly of Deck Mechanism Unit & Deck P.C.B.
10.7. CD Mechanism Main Component Replacement Procedures
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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 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 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).
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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.
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.
· Note for installation of the CD servo P.C.B.
· Installation for traverse deck ass’y
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SA-AK220GCP

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.
Step 4 Force the disc tray fully.
Step 5 With pressing the claw (B) in the direction of arrow (1),
force the connection lever in the direction of arrow (2).
10.7.2. Replacement for the Disc Tray
Step 1 Remove 4 screws.
Step 2 Remove the upper plate.
Step 3 Remove 3 screws.
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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.
Step 6 Insert the gear with hexagonal wrench into the hole.
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 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 1 Slide the drive rack fully in the direction of arrow.
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