Panasonic SA-AK52 User manual

■AMPLIFIER SECTION
PMPO 2300 W
RMS power output
THD 10%, both channels driven
80 Hz, both channel driven
(Low channel) 100 W per channel (6 Ω)
1 kHz, both channel driven
(High channel) 40 W per channel (6 Ω)
Total Bi-Amp power 140 W per channel
Input sensitivity
AUX 250 mV
MIC 0.7 mV
Input Impedance
AUX 13 kΩ
MIC 680 Ω
■FM TUNER SECTION
Frequency range 87.5 - 108 MHz (50 kHz steps)
Sensitivity 2.5 µV (IHF)
S/N 26 dB 2.2 µV
Antenna terminal(s) 75 Ω(unbalanced)
■AM TUNER SECTION
Frequency range
MW 522 - 1629 kHz (9 kHz steps)
520 - 1630 kHz (10 kHz steps)
© 2001 Matsushita Electronics (S) Pte Ltd. All rights
reserved. Unauthorized copying and distribution is a
violation of law.
SA-AK52
Colour
(S)... Silver Type
Area
(GC)...Asia, Latin America, Africa and Middle Near East
TAPE SECTION :
AR2 MECHANISM SERIES
CD SECTION :
RAE0152Z-3 TRAVERSE DECK SERIES
SW 3.200 - 7.350 MHz (0.005 MHz
steps)
9.400 - 21.750 MHz (0.005 MHz
steps)
Sensitivity
MW
S/N 20 dB (at 999 kHz) 560 µV/m
SW
S/N 20 dB (at 5.3 MHz) 35.5 µV/m
■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
Frequency response (+3 dB, -6 dB at DECK OUT)
NORMAL (TYPE I) 35 Hz - 14 kHz
HIGH (TYPE II) 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
CD Stereo System
Specifications
ORDER NO. MD0101010C3

C-60 cassette tape
■CD SECTION
Sampling frequency 44.1 kHz
Decoding 16 bit linear
Beam source/wave length 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)
■GENERAL
Power supply AC 110 V/127 V/220 V/230-240V,
50/60 Hz
Power consumption 180 W
1 Before Use 3
2 Before Repair and Adjustment 3
3 Protection Circuitry 3
4 Accessories 3
5 Handling Precautions For Traverse Deck 4
6 Precaution of Laser Diode 5
7 Operation Procedures 6
8 Operation Checks and Main Component Replacement
Procedures 8
9 Self-Diagnostic Function 18
10 Description of Error Code 19
Power consumption in standby mode
0.8 W
Dimensions (W x H x D) 250 x 332 x 316 mm
Mass 9.0 kg
■SYSTEM
SC-AK52(GC) Music Center: SA-AK52(GC)
Speaker: SB-AK52(GC)
Notes:
1.Specifiacations are subject to change without notice. Weight 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.
11 CD Test Mode Function 20
12 Measurements and Adjustments 20
13 Illustration of IC’s, Transistors and Diodes 24
14 Terminal Function of ICs 25
15 Block Diagram 28
16 Schematic Diagram 34
17 Printed Circuit Board 48
18 Wiring Connection Diagram 58
19 Troubleshooting Guide 59
20 Parts Location and Replacement Parts List 60
CONTENTS
Page Page
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4 Accessories
Remote Control
Transmitter
FM indoor antenna
AC mains lead
Power plug adapter
AM Loop antenna
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 C531, C532, C533, C534, C579 through a 10 Ω, 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 V, 60 Hz in NO SIGNAL mode should be ~650mA respectively.
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.
3
SA-AK52

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 finish the work
quickly.
3.Take care not to apply excessive stress to the flexible
board (FFC board).
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 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 electrostatics breakdown. Be
sure to remove the solder from the short point before
making connections.
5 Handling Precautions For Traverse Deck
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6 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 :100W/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.
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.
■Use of Caution Labels
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7 Operation Procedures
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Some chassis components may have sharp edges.
Be careful when disassembling and servicing.
8 Operation Checks and Main Component Replacement
Procedures
“ATTENTION SERVICER”
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.
Contents
• Disassembly and assembly main unit
1.Checking of the Main, Panel, Deck and Power P.C.B.
• Main Component Replacement Procedures
1.Replacement of the Traverse Deck.
2.Replacement of the Power Amplifier IC.
• Disassembly and assembly of the Traverse Unit
• Disassembly and assembly of the Disc Tray
Warning:
This product uses a laser diode. Refer to caution statement Precaution of Laser Diode.
ACHTUNG:
Die Lasereinheit nicht zerlegen.
Die Lasereinheit darf nur gegen eine vom Hertsteller spezifizierte Einheit ausgetauscht werden.
8
SA-AK52

Step 1 Remove 3 screws each side and 5 screws at rear panel.
Step 2 Remove the Top Cabinet
Step 3 Remove T-bracket.
Step 4 Remove 2 screws each side of the inner chassis and a
screw at the rear panel. Turn locating pin 90°.
(Locating pin need not have to be bent back).
Step 5 Release the wires CN 300, 301, 302, 304 and 309.
Remove rear panel by pulling backward and lift rear panel assy
off.
Remove Front Panel
8.1. Disassembly and assembly main unit
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Step 1 : Use a hexagonal wrench and turn clockwise to release
the tray.
Step 2 : Remove the 2 screws.
Step 3 : Push the CD tray in the direction shown above.
Step 4 : Remove the CD lid in the direction of the arrow.
Step 5 : Release the two catches shown above to remove the
front cabinet from the CD Traverse Unit.
Separated front and rear panel assy.
Removal of Inner bracket.
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Step 7 Remove 2 screws from bottom and 2 screw beside
inner bracket to push forward to release the front panel. Step 8 To release inner bracket, remove 4 screws.
Step 1 Remove 2 screws each side.
8.1.1. Checking for Panel, Main and Deck P.C.B.
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Step 6 : Reconnect all connectors.
Step 7 : Use extension 14pin FFC wire for CN309.
Step 8 : Supply power for troubleshooting.
8.1.2. Checking for Power P.C.B.
8.1.3. For Live Troubleshooting Procedure
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8.2.1. Replacement of the Traverse Deck
Step 1 Follow the procedures in ‘Disassembly of the Traverse
Unit’ ( Step 1 - Step 4 ).
Step 3 Desolder the 4 legs of the 2 motors and pull out the
Servo P.C.B.
Step 4 Widen the 3 bosses with a flat screwdriver and pull out
the 3 pins. Then remove the Traverse Deck.
Step 5 Remove the flexible cable CN701.
• Removal of the flexible cable. Push the top of the connector
in the direction of the arrow 1, and then pull out the flexible
cable in the direction of the arrow 2.
Note:
Insert a short pin into the flexible cable for traverse unit.
• 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
assembly.
8.2. Main Component Replacement Procedures
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Step 1 Follow the procedures in ‘Checking Procedure for each
major P.C.B.’ ( Step 1 - Step 6 ).
Step 4 Remove the wires at CN302, CN303 and CN304 and
pull out the Main PCB.
Step 5 Remove the 4 screws fixed to the Power Amplifier IC.
Note:
Before installing the CD servo P.C.B., move the optical pickup
towards the outer edge from the marking (black triangle).
[Otherwise, the reset detect switch (S701) mounted on the CD
servo P.C.B. may be damaged.]
Step 6 Unsolder the terminals of Power Amp IC and replace
the respective component.
8.2.2. Replacement of the Power Amplifier IC
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Step 1 Push the lever from position A to B.
Step 2 Pull the stopper (black) in the direction of arrow 1 and
push the lever in the direction of arrow 2.
Step 3 Push the stopper (black) down until the white lever eject
out.
Step 4 Lift up the traverse unit and slide out the unit as shown.
• Replacement of Traverse Unit
Step 1 Place the traverse unit as shown.
Step 2 Press in the lever shaft in the direction of arrow 1 as
shown and push the traverse unit into the position in the
direction of arrow 2.
Step 3 Pull the stopper in the direction of arrow 1 and release
the lever in the direction of arrow 2 as shown.
Step 4 Pull out the tray half way and push it back fully.
Step 5 Push the lever to the initial position indicated ‘|---|’.
8.3. Disassembly and assembly of the Traverse Unit
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Step 2 With lifting the claw in the direction of arrow 1, draw the
clamp SW P.C.B. in the direction of arrow 2.
Step 3 Remove the mechanism cover.
Step 4 Insert the gear with hexagonal wrench into the hole.
Step 5 Rotate the hexagonal wrench in the direction of arrow
(clockwise), and then open the disc tray fully.
Step 6 Upset the CD changer unit again.
Step 7 Release both the claws, and then draw the disc tray.
Step 8 With forcing the left guide bar manually because the left
guide bar interferes with claw, draw the disc tray.
• Installation of the disc tray after replacement
8.4. Disassembly and assembly of the Disc Tray
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Step 1 Slide the drive rack fully in the direction of the arrow.
Step 2 Holding the drive rack, not to move, install the disc tray.
Step 3 Align the drive rack with the drive gear.
Step 4 Holding the disc tray manually, rotate the pulley gear in
the direction of arrow.
Step 5 Rotate the gear 5 or 6 times manually, and then push
the disc tray.
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9 Self-Diagnostic Function
9.1. Self-diagnostic display
This unit is equipped with a self-diagnostic display function which, if a problem occurs, will display an error code corresponding to
the problem.
Use this function when performing maintenance on the unit.
9.2. How to enter the Self-Diagnostic Function
9.3. Cassette Mechanism Test (For error code H01, H02, H03, F01, F02)
1.Press “TAPE, DECK 1/2” to select Deck 2.
2.Load a cassette tape with the erasure prevention tab, remove from left side only and close the cassette holder.
3.Press “FAST FORWARD MEMORY” (Tape will be stop after 2 seconds)
4.Load a cassette tape with the erasure prevention tab, remove from right side only and close the cassette holder.
5.Press “REVERSE FM MODE/BP” (Tape will be stop after 2 seconds)
6.Load a pre-recorded tape with both side record tabs intact and close the cassette holder.
7.Press “PLAY/TUNE/TIME ADJ UP” (After TPS function, tape will stop automatically)
8.Press “REC/STOP” (Tape will not move)
9.Press “STOP/TUNE MODE” to indicate Error code.
• If several problem exist, error code will change each time when “■/TUNE MODE” is pressed.
(e.g. H01 →H03 →F01 .....etc.)
10.Press “TAPE, DECK 1/2” to select Deck 1.
11.Repeat step 2 to 9 to test Deck 1. (Tape Deck 1 will not check H02 because of no recording function)
9.4. CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29, H15, F75)
1.Press “CD”.
2.Press “OPEN/CLOSE (1)” and place a CD.
3.Press “OPEN/CLOSE (1)” to close the tray.
4.Press “OPEN/CLOSE (5)” and wait until the tray is open.
5.Press “OPEN/CLOSE (1)” and remove the CD.
6.Press “OPEN/CLOSE (1)” to close the tray.
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9.7. Power Amplifier Failure (F61)
10 Description of Error Code
7.Press “■/TUNE MODE” to indicate Error Code.
• If several problem exist, error code will change each time when “■/TUNE MODE” is pressed. (e.g. F15 →F26 →F16 ....etc).
9.5. To clear all Error code
1.Press “STOP/TUNE MODE” button for 5 seconds.
2.FL indicator shows “CLEAR” for 1 second and change to “T”.
9.6. How to get out from Self-Diagnostic function
1.Press “Power” button OFF.
1.When power amplifier fail, F61 will indicate automatically.
10.1. Error detection for Cassette Mechanism block
No. Error Error
Display Problem condition
1 MODE SW
detection error H01 Faulty operation of cassette mechanism. Faulty contact or short-circuit of mechanism mode switch (S951, S971).
2REC INH SW
detection error H02 Recording not possible. Faulty contact or short-circuit of REC INH switch (S974, S975).
3HALF SW
detection error H03 Playback cannot perform. Faulty contact or short-circuit of HALF siwtch (S952, S972).
4Reel Pulse
detection error F01 The tape advances slightly and then stops. Faulty reel pulse, faulty hole detect IC (IC951, IC971).
5TPS abnormal F02 Cassette deck will not perform TPS function.
Faulty playback EQ/recording amplifier IC (IC101).
10.2. Error detection for CD/Changer block
No. Error Error
Display Problem condition
1REST SW detection error F15 CD does not function.
This error occurs when the Optical Pick Up REST SW (S701) is not
detected within the specified time (about 8 seconds)
2CD tray opens automatically F16 CLAMP switch (S4) NG (Check & Replace)
3Does not startup when [PLAY]
button is pressed F17 BOTTOM switch (S5) NG (Check & Replace)
4Transmission error between CD
servo LSI and micon F26 CD does not function. This error occurs when the POWER is ON for the CD block and an error
is detected after the transmission has started.
5Startup fails even when you
insert CD or the selected disc tray
does not open
F27 Tray 1 detect switch or Tray 2 detect switch NG (Check & Replace)
6Cannot insert CD F28 Tray 1 detect switch NG (Check & Replace)
7Cannot eject CD F29 Check if disc is stuck. Tray 2 detect switch NG (Confirm & Replace)
8The CD tray closes H15 CD disc tray detect switch NG (S3) (Check & Replace)
10.3. Power Supply related error detection
No. Error Error
Display Problem condition
1POWER AMP
output abnormal F61 When POWER is switched on, power become off automatically. During normal operation, if DC DET become L, PCNT shall become
L and the error display on the left shall be displayed. (IC501)
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This CD test mode is provided to check CD unit without
connecting to changer loading mechanism. This mode shall
operate CD PLAY with CD unit being connected only and CD
Automatic Alignment result is shown on FL display.
11.1. How to set CD test mode
12.1. Cassette Deck Section
• Measurement Condition
− Reverse-mode selector switch:
− Tape edit: NORMAL
− Record timer: OFF
− Make sure head, capstan and press roller are clean.
− Judgeable room temperature 20 ± 5 °C (68 ± 9°F)
• Measuring instrument
− EVM (Electronic Volmeter)
− Digital quency counter
• Test Tape
− Head azimuth adjustment (8 kHz, -20 dB); QZZCFM
− Tape speed gain adjustment (3 kHz, -10 dB);
QZZCWAT
− Playback gain adjustment (315 Hz, 0 dB); QZZCFM
− CrO2 tape, QZZCRX
12.1.1. Head Azimuth Adjustment (Deck
1/2)
Caution:
• Please replace both azimuth adjustment screw
(RHE5152ZB) and springs (RM0331) simultaneously when
readjusting the head azimuth. (shown in Fig. 2) Even if you
11.2. CD Automatically Adjustment
result indication
Under CD test mode, pressing the numeric key ‘0’ on the
remote controller will display the auto adjustment result.
FLOCK, TLOCK and CLVS status shall be shown as below:
During the above display, executing CD PLAY will display auto
adjustment result for CD PLAY mode.
wish to readjust the head azimuth without replacing the
acrews and springs, a fine adjustment to the azimuth screw
and spring.
• Please remove the screw-locking bond left on the head
base when replacing the azimuth screw.
• If you wish to readjust the head azimuth, be sure to adjust
with adhering the cassette tape closely to the mechanism
by pushing the center of cassette tape with your finger.
(shown in Fig. 3)
1.Playback the azimuth adjustment portion (8 kHz, -20dB) of
the test tape (QZZCFM) in the forward play mode. Vary the
azimuth adjustment screw until the output of the R-CH (PB
OUT-R) are maximized.
2.Perform the same adjustment in the reverse play mode.
3.After the adjustment, apply screwlock to the azimuth
adjusting screw.
11 CD Test Mode Function
12 Measurements and Adjustments
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