Panasonic SA-AK770PL User manual

■AMPLIFIER SECTION
RMS output power
Front Ch (both channels driven)
250 W per channel (6 Ω), 1 kHz, 10% THD
Subwoofer Ch
200 W per channel (6 Ω), 100 Hz, 10% THD
Total RMS stereo mode power 700 W
PMPO 7700 W
■FM/AM TUNER, TERMINALS SECTION
Preset station FM 30 stations
AM 15 stations
Frequency Modulation (FM)
Frequency range
87.9 to 107.9 MHz (200 kHz steps) (PL only)
87.5 to 108.00 MHz (100 kHz steps) (PL only)
87.50to108.00MHz(50kHzsteps)(GCPonly)
Antenna terminal(s) 75 Ω(unbalanced)
Amplitude Modulation (AM)
Frequency range
520 to 1710kHz (10 kHz steps) (PL only)
522 to 1629 kHz (9 kHz step) (GCP only)
522to1630kHz(10kHzsteps)(GCPonly)
Music Port (front) jack
© 2008 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-AK770PL
SA-AK770GCP
Colour
(K)... Black Type
Sensitivity 100 mV, 4.0 k Ω
Terminal Stereo, 3.5 mm jack
Headphone jack
Terminal Stereo, 3.5 mm jack
Output level (CD, 1 kHz, -20 dB) 32 Ω(Max)
Mic jack
Sensitivity 0.7 mV, 1.2 k Ω
Terminal Mono, 3.5 mm jack (1 system)
■CASSETTE DECK SECTION
Type 1way
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
Erase system AC erase 100 kHz
Tape speed 4.8 cm/s
Overall frequency response (+3, -6 dB) at DECK OUT
NORMAL 35 Hz to 10 kHz
S/N ratio 50 dB (A weighted)
Wow and flutter 0.18 % (WRMS)
Fast forward and rewind time
CD Stereo System
Notes: This model’s CD mechanism changer unit is CR14C. Please refer to the original Service Manual
(Order No. MD0805031CE) for this mechanism.
Specifications
ORDER NO. MD0805007CE

Approx. 120 seconds with C-60 cassette tape
■DISC SECTION
Disc played [8 cm or 12 cm]
(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3* formatted disc)
(3) MP3*
* MPEG-1 Layer 3, MPEG-2 Layer 3
Pick up
Wavelength 780 nm
Beam Source Semiconductor laser
Audio output (Disc)
Number of channel 2.1 (FL, FR, SW)
FL = Front left channel
FR = Front right channel
SW = Subwoofer channel
■USB SECTION
USB Port
USB Standard USB 2.0 full speed
Media file format support
MP3 (*.mp3)
USB device file system
FAT 12
FAT 16
FAT 32
USB port power 500 mA (Max)
USB Ripping (recording)
Recording file format
MP3 (*.mp3)
Bit rate 128 kbps / 192 kbps / 320 kbps
1 Safety Precautions 3
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 5
3 Handling Precautions for Traverse Unit 6
4 Precaution of Laser Diode 8
5 About Lead Free Solder (PbF) 9
6 Operation Procedures 10
7 Self diagnosis and special mode setting 14
8 Assembling and Disassembling 22
9 Disassembly and Assembly of Traverse Unit Assembly in
Play Position 58
10 Service Fixture and Tools 60
11 Service Positions 60
USB recording speed 1x, max 4x (CD only)
■GENERAL
Power supply
AC 120 V, 60Hz (PL only)
AC 110 to 127/220 to 240 V, 50/60 Hz (GCP only)
Power consumption 164W(PLOnly)
145 W (GCP Only)
Dimensions (WxHxD) 250 x 331 x 334 mm
Mass 4.9 kg
Operating temperature range 0 to 40°C
Operating humidity range 35 to 80% RH (no condensation)
Power consumption in standby mode:
0.3 W (approx.) (PL only)
0.5 W (approx.) (GCP only)
■SYSTEM
SC-AK770 (PL) Music center: SA-AK770 (PL)
Speakers: SB-AK770 (PL)
Subwoofer: SB-WAK770 (PL)
SC-AK770 (GCP) Music center: SA-AK770 (GCP)
Speakers: SB-AK770 (PL)
Subwoofer: SB-WAK770 (PL)
For information on speaker system, please refer to the original
Service Manual (Order No. MD0805008CE) for SB-AK770PL-K &
(Order No. MD0805009CE) for SB-WAK770PL-K.
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.
12 Procedure for Checking Operation of Individual Parts of Deck
Mechanism Unit 68
13 Measurement And Adjustments 69
14 Voltage Measurement and Waveform Chart 71
15 Wiring Diagram 79
16 Block Diagram 81
17 Notes Of Schematic Diagram 89
18 Schematic Diagram 91
19 Printed Circuit Board 109
20 Illustration of ICs, Transistors and Diodes 117
21 Terminal Function of Integrated Circuits 118
22 Exploded Views 121
23 Replacement Parts List 125
CONTENTS
Page Page
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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.
(This “Safety Precaution” is applied only in U.S.A.) (For PL Only)
1.Before servicing, unplug the power cord to prevent an electric shock.
2.When replacing parts, use only manufacturer’s recommended components for safety.
3.Check the condition of the power cord. Replace if wear or damage is evident.
4.After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5.Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the
customer from being exposed to a shock hazard.
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 exposed metallic cabinet 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 1MΩand 5.2MΩ.
When the exposed metal does not have a return path to the chassis, the reading must be .
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.
Fig. 1
1.2. Before Use (For GCP Only)
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 110V or 127V, 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.)
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1.3. Before repair and adjustment
Disconnect AC power, discharge AC Capacitors C5700, C5701, C5703, C5704, C5705 (PL Only); C5700, C5701, C5703, C5704,
C5705, C5706 & C5707 (GCP Only) 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 120V, 60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 750mA (For PL only).
Current consumption at AC 110V~127V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 750mA (For GCP
only).
Current consumption at AC 220V~240V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 500mA (For GCP
only).
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.
1.5. Safety Part Information
Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts should
be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without
permission of manufacturer.
Table 1
Reference No. Part No. Part name & Description Remarks
18 RGRX0070F-A REAR PANEL [M] PL
18 RGRX0070G-A REAR PANEL [M] GCP
36 RKMX0144-K TOP CABINET [M]
51 RMZ0339 ZENER COVER [M] GCP
68 REXX0686 WHITE WIRE (VOLTAGE
SELECTOR) [M] GCP
69 REXX0687 BLUE WIRE (VOLTAGE
SELECTOR) [M] GCP
84 REXX0684 BLACK WIRE [M] PL
85 REXX0685 RED WIRE [M] PL
89 REZX0024 RED WIRE [M] GCP
90 REZX0023 BLACK WIRE [M] GCP
340 RAEX0190A-V TRAVERSE ASSEMBLY UNIT [M] (RTL)
A2 K2CB2CB00021 AC CORD [M] PL
A2 K2CQ2CA00007 AC CORD [M] GCP
PCB4 REPX0622E SMPS P.C.B. [M] (RTL) PL
REPX0622G SMPS P.C.B. [M] (RTL) GCP
PCB10 REPX0622E AC INLET P.C.B. [M] (RTL) PL
REPX0622G AC INLET P.C.B. [M] (RTL) GCP
PCB13 REPX0622G VOLTAGE SELECTOR P.C.B. [M] (RTL) GCP
DZ5701 ERZV10V511CS ZENER [M]
S5701 K0ABCA000007 SW VOLTAGE SELECTOR [M] GCP
L5702 ELF22V035B LINE FILTER [M]
T2900 G4D1A0000117 SWITCHING TRANSFORMER [M]
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Reference No. Part No. Part name & Description Remarks
T5701 ETS48AB116AC SWITCHING TRANSFORMER [M] GCP
T5701 ETS48AB12GAC SWITCHING TRANSFORMER [M] PL
T5751 ETS19AB256AG BACKUP SW TRANFORMER [M]
PC5701 B3PBA0000402 PHOTO COUPLER [M]
PC5702 B3PBA0000402 PHOTO COUPLER [M]
PC5720 B3PBA0000402 PHOTO COUPLER [M]
PC5799 B3PBA0000402 PHOTO COUPLER [M]
F1 K5D802APA008 FUSE [M] PL
F1 K5D802BNA005 FUSE [M] GCP
FP2901 K5G4013A0001 FUSE PROTECTOR [M]
TH5701 D4CAA5R10001 THERMISTOR [M] PL
TH5702 D4CAC8R00002 THERMISTOR [M] GCP
P5701 K2AA2B000017 AC INLET [M] GCP
P5701 K2AB2B000010 AC INLET [M] PL
C5700 F1BAF1020020 1000pF [M]
C5701 F0CAF334A087 0.33uF [M]
C5703 F0C2H1040001 0.1uF 500V [M] GCP
C5703 F0CAF224A085 0.22uF [M] PL
C5704 F1BAF1020020 1000pF [M]
C5705 F1BAF1020020 1000pF [M]
C5706 F1BAF1020020 1000pF [M] GCP
C5707 F1BAF1020020 1000pF [M] GCP
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 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
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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