Panasonic SA-AK240E / SA-AK240EB / SA-AK240EG Service Manual ▷ View online
n AMPLIFIER SECTION
RMS Output power
THD 10%, both channels driven
1 kHz
115 W per channel (3
Ω)
Total output power
230 W
n FM/AM TUNER, TERMINALS SECTION
Preset station
FM 15 stations
AM 15 stations
Frequency Modulation (FM)
Frequency range
87.50 to 108.00 MHz (50 kHz
steps)
Sensitivity
4.0 µV (IHF)
S/N 26dB
2.2 µV
Antenna terminals
75
Ω (unbalanced)
Amplitude Modulation (AM)
Frequency range
522 to 1629 kHz (9 kHz step)
Sensitivity
S/N 20dB (at 999 kHz)
560 µV/m
Music Port input jack
Terminal
Stereo, 3.5 mm jack
Sensitivity
100 mV, 4.7 k
Ω
Phone jack
Terminal
Stereo, 3.5 mm jack
n CASSETTE DECK SECTION
2006 Co. .
SA-AK240E
SA-AK240EB
SA-AK240EG
SA-AK240EB
SA-AK240EG
Colour
(S)... Silver Type
(S)... Silver Type
Track system
4 track, 2 channel
Heads
Record/playback
Solid permoy 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
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
n DISC SECTION
Disc played [8 cm or 12 cm]
(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3, WMA formatted disc)
(3) MP3/WMA
Bit rate
MP3, WMA
32 kbps to 320 kbps
Sampling frequency
MP3/WMA
32 kHz, 44.1 kHz, 48 kHz
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. MD0512482C2
CD-DA
44.1 kHz
Decoding
16 bit linear
Digital filter
8 fs
D/A converter
MASH (1 bit DAC)
Pick up
Wavelength
780 nm
Beam Source
Semiconductor laser
Audio output (Disc)
Number of channels
2 (Stereo) (FL,FR)
n GENERAL
Power supply
For E/EG only
AC 230 V, 50Hz
For EB only
AC 230 to 240 V, 50Hz
Power consumption
95 W
Power consumption in standby
mode
mode
0.5 W
Dimensions (W x H x D)
250 x 330 x 343 mm
1 Safety Precautions
4
1.1.
General Guidelines
4
1.2.
Caution for AC Mains Lead
5
1.3.
Before repair and adjustment
5
1.4.
Protection Circuitry
6
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
6
3 Handling Precautions For Traverse Deck
7
4 Precaution of Laser Diode
8
5 Handling the Lead-free Solder
9
5.1.
About lead free solder (PbF)
9
6 New Features
10
6.1.
CRS1 Mechanism Overview
10
6.2.
Music Port
12
7 Accessories
13
8 Operating Instructions Procedures
14
9 Self diagnosis and special mode setting
16
9.1.
Special Mode Table
16
9.2.
Error code Table
18
10 Assembling and Disassembling
22
10.1. Caution
22
10.2. Disassembly flow chart
23
10.3. Main Parts Location
24
10.4. Disassembly of Top Cabinet
25
10.5. Disassembly of Rear Panel
25
10.6. Disassembly of CD Changer Unit (CRS1)
25
10.7. Disassembly of Main P.C.B.
27
10.8. Disassembly of Transformer P.C.B.
27
Mass
6.9 kg
Operating temperature range
+5 to +35°C
Operating humidity range
5 to 90% RH (no condensation)
n SYSTEM
SC-AK240 (E-S)
Music center: SA-AK240 (E-S)
Speaker: SB-AK240 (EG-S)
SC-AK240 (EB-S)
Music center: SA-AK240 (EB-S)
Speaker: SB-AK240 (EG-S)
SC-AK240 (EG-S)
Music center: SA-AK240 (EG-S)
Speaker: SB-AK240 (EG-S)
For information on speaker system, please refer to the original
Service Manual (Order No. MD0512445A2)
Service Manual (Order No. MD0512445A2)
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.
10.9. Disassembly of Power P.C.B.
28
10.10. Disassembly of Front Panel Unit
29
10.11. Disassembly for Panel P.C.B.
30
10.12. Disassembly of Deck mechanism unit
31
10.13. Disassembly of Deck P.C.B.
31
10.14. Disassembly of Traverse Unit
31
10.15. Disassembly of optical pickup unit (CD mechanism)
33
10.16. Disassembly of Deck Mechanism
36
10.17. Replacement for cassette lid
38
10.18. Rectification for tape jam problem
39
11 Service Fixture and Tools
40
12 Service Positions
40
12.1. Checking and Repairing of Main P.C.B.
40
12.2. Checking and Repairing of Transformer P.C.B.
41
12.3. Checking and Repairing of Panel, Deck & Deck
Mechanism P.C.B.
42
12.4. Checking and Repairing of Power P.C.B.
43
13 Adjustment Procedures
44
13.1. Cassette Deck Section
44
13.2. Tuner Section
45
14 Voltage and Waveform Chart
47
14.1. CD Servo P.C.B. & Main P.C.B.
47
14.2. Power P.C.B. & Transformer P.C.B.
49
14.3. Waveform Chart
50
15 Wiring Connection Diagram
52
16 Block Diagram
53
17 Schematic Diagram
57
17.1. Notes of Schematic Diagrams
57
CONTENTS
Page
Page
2
SA-AK240E / SA-AK240EB / SA-AK240EG
17.2. (A) CD Servo Circuit
59
17.3. (B) Main (Tuner) Circuit
61
17.4. (B) Main Circuit
63
17.5. (C) Panel Circuit
67
17.6. (D) Transformer Circuit
69
17.7. (H) Power Circuit
71
17.8. (F) Deck Circuit & (G) Deck Mechanism Circuit
73
18 Printed Circuit Board
75
18.1. (A) CD Servo P.C.B.
76
18.2. (B) Main P.C.B.
77
18.3. (C) Panel P.C.B.
78
18.4. (D) Transformer P.C.B.
79
18.5. (E) Power P.C.B.
80
18.6. (F) Deck P.C.B. & (G) Deck Mechanism P.C.B.
81
19 Illustration of ICs, Transistors and Diodes
83
20 Terminal Function of IC's
84
20.1. IC7001 (MN6627954MA) Servo Processor,Digital Signal
Processor/Digital filter and D/A Converter
84
20.2. IC7002 (BA5948FPE2) IC 4CH Drive
85
20.3. IC2801 (C2CBYY000053) System Microprocessor
85
21 Exploded Views
87
21.1. Cabinet Parts Location
89
21.2. Deck Mechanism Parts Location (RAA4502-S)
91
21.3. Packaging
93
22 Replacement Parts List
95
3
SA-AK240E / SA-AK240EB / SA-AK240EG
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
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 5.2MΩ.
When the exposed metal does not have a return path to the chassis, the reading must be
.
Fig. 1
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
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
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.
4
SA-AK240E / SA-AK240EB / SA-AK240EG
