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
2
SA-AK52

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
4
SA-AK52

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
5
SA-AK52

7 Operation Procedures
6
SA-AK52

7
SA-AK52

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
9
SA-AK52

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.
10
SA-AK52