SA-AK750PL.pdf

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ORDER NO. MD0703022CE
CD Stereo System
SA-AK750PL
Colour
(K)... Black Type
Notes: This model’s CD mechanism changer unit is CRS1. Please refer to the original Service Manual
(Order No. MD0509368C0) for this mechanism.
Specifications
n AMPLIFIER SECTION
FTC output power
THD 10%, both channels driven
100 Hz to 3 kHz
(Low channel)
Frequency range
87.9 to 107.9 MHz (200 kHz
steps)
87.5 to 108.0 MHz (100 kHz
steps)
80 W per channel (3 Ω )
Sensitivity
4.0 µV (IHF)
S/N 26 dB
2.2 µV
3 kHz to 12 kHz
(High channel)
80 W per channel (3 Ω )
Antenna terminal(s)
75 Ω (unbalanced)
Amplitude Modulation (AM)
Frequency range
40 Hz to 100 Hz
(Subwoofer channel)
160 W per channel (6 Ω )
520 to 1710 kHz (10 kHz step)
Sensitivity
S/N 20 dB (at 1000 kHz)
Total FTC power
480 W
560 µV/m
RMS output Bi-amp power
THD 10%, both channels driven
1 kHz
(Low channel)
Music Port input jack
Terminal
Stereo, 3.5 mm jack
110 W per channel (3 Ω )
Sensitivity
100 mV, 4.7 k Ω
Phone jack
Terminal
10 kHz
(High channel)
110 W per channel (3 Ω )
Stereo, 3.5 mm jack
MIC jack
Terminal
60 Hz
(Subwoofer channel)
220 W per channel (6 Ω )
Mono, 3.5 mm jack
Sensitivity
0.7 mV, 680 Ω
Total output power
660 W
n CASSETTE DECK SECTION
Track system
PMPO
7200 W
4 track, 2 channel
n FM/AM TUNER, TERMINALS SECTION
Preset station
FM 20 stations
AM 15 stations
Heads
Record/playback
Solid permalloy head
Erasure
Double gap ferrite head
Frequency Modulation (FM)
© 2007 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
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SA-AK750PL
Motor
DC servo motor
Supported audio file format
MP3 bit rate
USB memory port
Maximum current
Recording system
AC bias 100 kHz
Erase system
AC erase 100 kHz
Tape speed
4.8 cm/s
500 mA
Overall frequency response (+3, -6 dB) at DECK OUT
NORMAL
35 Hz to 14 kHz
Bit rate
MP3
32 kbps to 320 kbps
S/N ratio
50 dB (A weighted)
Sampling frequency
MP3
Wow and flutter
0.18 % (WRMS)
32 kHz, 44.1 kHz, 48 kHz
Fast forward and rewind time
Approx. 120 seconds with
C-60 cassette tape
Audio output (MP3)
Number of channels
2 channel
n 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
Bit rate
MP3
Frequency response (MP3)
20 Hz to 20 kHz (0+/-1.0 dB)
S/N Ratio
USB unit out
85 dB
n GENERAL
Power supply
AC 120 V, 60Hz
Power consumption
150 W
Power consumption in standby
mode
0.28 W
32 kbps to 320 kbps
Sampling frequency
MP3
Dimensions (W x H x D)
250 x 330 x 323 mm
32 kHz, 44.1 kHz, 48 kHz
Mass
7.1 kg
CD-DA
44.1 kHz
Operating temperature range
+5 to +35°C
Decoding
16 bit linear
Operating humidity range
5 to 90% RH (no condensation)
Digital filter
8fs
n SYSTEM
SC-AK750 (PL) Music center: SA-AK750 (PL)
Speaker: SB-AK750 (PL)
Subwoofer: SB-WAK750 (PL)
For information on speaker system, please refer to the original
Service Manual (Order No. MD0703024CE) for SB-AK750PL-K and
(Order No. MD0703025CE) for SB-WAK750PL-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.
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 USB SECTION
Playable USB Storage Media
1) HDD
2) USB MP3 Player/Digital audio player
3) USB Thumbdrives
CONTENTS
Page
Page
1 Safety Precautions
4
5.1. Service caution based on legal restrictions
10
1.1. General Guidelines
4
6 Accessories
11
1.2. Before repair and adjustment
4
7 Operating Procedures
12
1.3. Protection Circuitry
5
7.1. Main Unit Key Buttons Operations
12
1.4. Caution for fuse replacement
5
7.2. Remote Controls Key Buttons Operations
12
1.5. Safety Part Information
5
8 New Features
14
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
5
8.1. Using the Music Port & Connecting and Playing a USB
Mass Storage Class Device
14
3 Handling Precautions For Traverse Deck
7
9 Self diagnosis and special mode setting
17
4 Precaution of laser diode
9
9.1. Service Mode Summary Table
17
5 Warning
10
9.2. Special Mode Table 1
17
2
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SA-AK750PL
9.3. Reliability Test Mode (CRS1 Mechanism)
20
15.5. Main P.C.B. 53
15.6. Deck P.C.B. 54
15.7. Waveform Chart 54
16 Wiring Connection Diagram 55
17 Block Diagram 57
17.1. CD Servo Diagram 57
17.2. Deck/ Deck Mechanism Diagram 58
17.3. Main Diagram 59
17.4. Panel Diagram 61
17.5. Power Diagram 62
17.6. USB/ Transformer Diagram 63
18 Notes Of Schematic Diagram 65
19 Schematic Diagram 67
19.1. (A) CD Servo Circuit 67
19.2. (B) Main Circuit 68
19.3. (C) Panel Circuit 72
19.4. (D) Sub Panel Circuit & (G) Deck Mechanism Circuit 73
19.5. (E) Power Circuit
9.4. Error code Table Display
21
10 Assembling and Disassembling
25
10.1. Caution
25
10.2. Disassembly flow chart
26
10.3. Main Parts Location
27
10.4. Disassembly of Top Cabinet
28
10.5. Disassembly of CD Changer Unit (CRS1)
28
10.6. Disassembly of Rear Panel
29
10.7. Disassembly of Main P.C.B.
31
10.8. Disassembly of Transformer P.C.B.
31
10.9. Disassembly of Power P.C.B.
32
10.10. Disassembly of Front Panel Unit
33
10.11. Disassembly for Panel P.C.B.
34
10.12. Disassembly of Tact Switch P.C.B.
35
10.13. Disassembly of USB P.C.B.
35
10.14. Disassembly of Deck mechanism unit
36
10.15. Disassembly of Deck P.C.B.
36
74
10.16. Disassembly of Traverse Unit
37
19.6. (F) Deck Circuit
76
10.17. Disassembly for Deck Mechanism
38
19.7. (I) Transformer Circuit
77
10.18. Disassembly of Deck Mechanism P.C.B.
41
19.8. (I) USB Circuit
78
10.19. Disassembly of cassette lid
42
20 Printed Circuit Board
79
10.20. Rectification for tape jam problem
42
20.1. (A) CD Servo P.C.B., (F) Deck P.C.B. & (G) Deck
Mechanism P.C.B. 80
20.2. (B) Main P.C.B. 81
20.3. (C) Panel P.C.B. 82
20.4. (D) Sub Panel P.C.B., & (I) USB P.C.B. (Side A & B) 83
20.5. (E) Power P.C.B.
11 Service Fixture and Tools
44
12 Service Positions
44
12.1. Checking and Repairing of Main P.C.B.
44
12.2. Checking and Repairing of Transformer P.C.B.
45
12.3. Checking and Repairing of Panel, Deck & Deck
Mechanism P.C.B. 45
12.4. Checking and Repairing of Power P.C.B. 46
13 Procedure for Checking Operation of Individual Parts of Deck
Mechanism Unit
84
20.6. (H) Transformer P.C.B.
85
21 Illustration of ICs, Transistors and Diodes
87
22 Terminal Function of IC's
88
47
22.1. IC7001 (MN6627954MA) Servo Processor,Digital Signal
Processor/Digital filter and D/A Converter
13.1. Operation Check with Cassette Tape
47
88
13.2. Operation Check without Cassette Tape
47
22.2. IC7002 (BA5948FPE2) IC 4CH Drive
89
14 Measurement And Adjustments
49
22.3. IC2801 (C2CBYY000423) System Microprocessor
89
14.1. Cassette Deck Section
49
23 Exploded Views
91
15 Voltage and Waveform Chart
51
23.1. Cabinet Parts Location
91
15.1. USB P.C.B.
51
23.2. Deck Mechanism Parts Location (RAA4403-S)
93
15.2. CD Servo P.C.B.
51
23.3. Packaging
94
15.3. Power P.C.B. & Transformer P.C.B.
52
24 Replacement Parts List
95
15.4. Panel P.C.B.
52
3
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SA-AK750PL
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.)
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 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.
Fig. 1
1.2. Before repair and adjustment
Disconnect AC power, discharge Power Capacitors C5101, C5104, C5171, C5172, C5920, C5940 and C5950 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 120V, 60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 500mA.
4
708685926.049.png
SA-AK750PL
1.3. 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.
1.4. Caution for fuse replacement
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
L5601
G0B9R5K00001
CHOKE COIL
L5602
G0B9R5K00001
CHOKE COIL
L5603
G0B9R5K00001
CHOKE COIL
L5604
G0B9R5K00001
CHOKE COIL
L5950
ELF15N035AN
LINE FILTER
T5950
G4CYAYY0 0147
MAIN TRANSFORMER
T5951
G4C2AAJ00005
SUB TRANSFORMER
Z5950
ERZV10V511CS
ZENER
RL5950
K6B1AEA00015
POWER RELAY
F1
K5D402APA008
FUSE
FP5920
K5G103A00019
FUSE PROTECTOR
FP5940
K5G103A00019
FUSE PROTECTOR
FP5950
K5G402A00025
FUSE PROTECTOR
JK5950
K2AB2B000007
JK AC INLET
A2
K2CB2CB00018
AC CORD
R5950
ERC12UGK335D
3.3M 1/2W
C5701
ECQU2A334MLA
100P 6.3V
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
5
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