Panasonic SA-AK270EB / SA-AK270EG Service Manual ▷ View online
■
AMPLIFIER SECTION
RMS output power stereo mode
THD 10%, both channels driven
1 kHz
125 W per channel (3
Ω
)
Total RMS stereo mode power
250 W
■
FM/AM TUNER, TERMINALS SECTION
Preset station
FM 25 stations
AM 15 stations
Frequency Modulation (FM)
Frequency range
87.50 to 108.00 MHz (50 kHz steps)
Antenna terminal(s)
75
Ω
(unbalanced)
Amplitude Modulation (AM)
Frequency range
522 to 1629 kHz (9 kHz step)
Music Port (front) jack
Sensitivity
100 mV, 4.0 k
Ω
Terminal
Stereo, 3.5 mm jack
Headphone jack
Terminal
Stereo, 3.5 mm jack
Output impedance
32
Ω
(Max)
■
CASSETTE DECK SECTION
Type
1 way
Track system
4 track, 2 channel
Heads
SA-AK270EB
SA-AK270EG
SA-AK270EG
Colour
(K)... Black Type
Record/playback
Solid permoy 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
Over frequency response (+3, -6 dB) at DECK OUT
NORMAL
35 Hz to 14 kHz
S/N ratio
50 dB (A weighted)
Wow and flutter
0.18 % (WRMS)
Fast forward and rewind time
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 channels
2 (FL, FR)
CD Stereo System
Notes: This model’s CD mechanism changer unit is CRS1. Please refer to the original Service Manual
(Order No. MD0509368C0) for this mechanism.
(Order No. MD0509368C0) for this mechanism.
Specifications
ORDER NO. MD0803003CE
■
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)
■
GENERAL
Power supply
AC 230 to 240 V, 50Hz
Power consumption
65 W
Dimensions (W x H x D)
250 x 331 x 342 mm
Mass
4.7 kg
1
Safety Precautions
3
2
Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
6
3
Handling Precautions For Traverse Unit
7
4
Precaution of Laser Diode
9
5
About Lead Free Solder (PbF)
10
6
Operation Procedures
11
7
New Features
14
8
Self diagnosis and special mode setting
16
9
Assembling and Disassembling
25
10 Service Fixture and Tools
54
11 Service Positions
54
Operating temperature range
0 to 40°C
Operating humidity range
35% to 80% RH (no condensation)
Power
consumption
in
standby
mode
0.4 W
■
SYSTEM
SC-AK270 (EB)
Music center: SA-AK270 (EB)
Speaker: SB-AK270 (PL)
SC-AK270 (EG)
Music center: SA-AK270 (EG)
Speaker: SB-AK270 (PL)
For information on speaker system, please refer to the original
Service Manual (Order No. MD0802018CE) for SB-AK270PL-K.
Service Manual (Order No. MD0802018CE) for SB-AK270PL-K.
Notes:
1.
Specifications are subject to change without notice. Mass and
dimensions are approximate.
dimensions are approximate.
2.
Total harmonic distortion is measured by the digital spectrum
analyzer.
analyzer.
12 Procedure for Checking Operation of Individual Parts of Deck
Mechanism Unit
61
13 Measurement And Adjustments
62
14 Voltage Measurement and Waveform Chart
64
15 Wiring Connection Diagram
69
16 Block Diagram
71
17 Notes Of Schematic Diagram
79
18 Schematic Diagram
81
19 Printed Circuit Board
95
20 Illustration of ICs, Transistors and Diodes
103
21 Terminal Function of Integrated Circuits
104
22 Exploded Views
107
23 Replacement Parts List
111
CONTENTS
Page
Page
2
SA-AK270EB / SA-AK270EG
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.
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 1M
chassis, the reading should be between 1M
Ω
and 5.2M
Ω
.
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 1.5k
Ω
, 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.
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
3
SA-AK270EB / SA-AK270EG
1.2. Caution for AC Mains Lead
1.3. Before repair and adjustment
Disconnect AC power, discharge AC Capacitors C5700, C5701, C5703, C5704, C5705, C5706 and C5707 through a 10
Ω
, 5W
4
SA-AK270EB / SA-AK270EG
