Panasonic SC-EN37EB / SC-EN37EG Service Manual ▷ View online
n AMPLIFIER SECTION
RMS OUTPUT POWER both channel driven simultaneously
10% total harmonic distortion (THD)
1 kHz
3.0 W per channel
Output impedance
HEADPHONE
16
Ω to 32 Ω
MUSIC PORT
14 k
Ω
DC In Jack
Terminal
DC 14 V
Phone Jack
Terminal
3.5 mm stereo
Music Port Jack
Terminal
3.5 mm stereo
Option Port
Version 1
n TUNER SECTION
Frequency range
FM
87.50 MHz to 108.00 MHz (50 kHz)
AM
522 kHz to 1629 kHz (9 kHz)
520 kHz to 1630 kHz (10 kHz)
n CD SECTION
Disc played [8cm or 12cm]
(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3)
2007 Co. .
SC-EN37EB
SC-EN37EG
SC-EN37EG
Colour
(K)... Black Type
System
SC-EN37EB-K
Main Unit: SA-EN37EB-K
Speakers: SB-EN37AEG-K (L) & SB-EN37EG-K (R)
(K)... Black Type
System
SC-EN37EB-K
Main Unit: SA-EN37EB-K
Speakers: SB-EN37AEG-K (L) & SB-EN37EG-K (R)
SC-EN37EG-K
Main Unit: SA-EN37EG-K
Speakers: SB-EN37AEG-K (L) & SB-EN37EG-K (R)
Main Unit: SA-EN37EG-K
Speakers: SB-EN37AEG-K (L) & SB-EN37EG-K (R)
(3) MP3
Sampling frequency
CD
44.1 kHz
MP3
32 kHz, 44.1 kHz, 48 kHz
Bit rate
MP3
32 kbps to 384 kbps
Decoding
16/20/24 bit linear
Pick up
Wavelength
785 nm
Laser power
CLASS 1
Audio Output (Disc)
Number of channels
2 channel
Frequency response
20 Hz to 20 kHz (+1, -2 dB)
Wow and flutter
Below measurement limit
Digital filter
8
D/A converter
MASH (1 bit DAC)
n GENERAL
Power supply
AC 230 to 240 V, 50 Hz
Power consumption
32 W
Dimension (W x H X D)
220mm x 236mm x 146 mm
Mass
With speakers
3.57 kg
Without speakers
1.27 kg
Operating tempurature range
+5°C to +35°C
CD Stereo System
Specifications
ORDER NO. MD0705009CE
Operating humidity range
5% to 9% RH (no condensation)
n SPEAKER SECTION
Type
1 Way, 1 speaker system
Speaker Unit(s)
Full Range Speaker
8 cm cone type 6
Ω
Impedance
6
Ω
Input power
6W (MAX)
1 Safety Precautions
4
1.1.
General Guidelines
4
1.2.
Caution for AC Mains Lead
5
1.3.
Before repair and adjustment
6
1.4.
Protection Circuitry
6
1.5.
Safety Parts Information
6
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
7
3 Precaution of Laser Diode
8
4 Handling Precautions For Traverse Unit
9
5 About Lead Free Solder (PbF)
10
5.1.
Service caution based on legal restrictions
10
6 Accessories
11
7 Operation Procedures
12
7.1.
Remote Control Key Buttons Operations
12
7.2.
Main Unit Key Buttons Operations
12
7.3.
Connection
13
8 Self diagnosis and special mode setting
14
8.1.
Service Mode Summary Table
14
8.2.
Service Mode Table 1
14
8.3.
Error Code Table 1
17
9 Assembling and Disassembling
18
9.1.
Caution
18
9.2.
Disassembly flow chart
19
9.3.
Main Components & P.C.B. Locations
20
9.4.
Disassembly of Rear Cabinet
21
9.5.
Disassembly of D-Port P.C.B.
21
9.6.
Disassembly of Panel P.C.B. & LED P.C.B.
21
9.7.
Disassembly of Main P.C.B., Sensor P.C.B. & Tuner
P.C.B.
22
9.8.
Disassembly of Switch P.C.B.
22
9.9.
Disassembly of Traverse Unit
23
9.10. Disassembly of Power Switch P.C.B. & Tact Switch P.C.B.
23
9.11. Replacement of Traverse Cover
24
9.12. Disassembly of CD Servo P.C.B.
25
9.13. Disassembly of Motor Unit & Motor P.C.B.
25
Dimension (W x H x D)
121 mm x 236 mm x 146 mm
Power consumption in standby mode:
2.0 W (appx.)
Notes:
· Specifications are subject to change without notice.
· Mass and dimensions are approximate.
· Specifications are subject to change without notice.
· Mass and dimensions are approximate.
9.14. Disassembly of CD Block & CD Lid
26
9.15. Disassembly of Speakers
27
10 Service Positions
30
10.1. Check and Repair of CD Servo P.C.B.
31
10.2. Check and repair of Main P.C.B., Sensor P.C.B., Tuner
P.C.B., Motor P.C.B., D-Port P.C.B., Panel P.C.B., LED
P.C.B., Power Switch P.C.B., Tact Switch P.C.B. & Switch
P.C.B.
32
11 Voltage and Waveform Chart
33
11.1. Main P.C.B.
33
11.2. CD Servo P.C.B.
34
11.3. Motor P.C.B.
34
11.4. Panel P.C.B.
34
11.5. Tuner P.C.B.
34
11.6. Waveform Chart
35
12 Wiring Connection Diagram
36
13 Block Diagram
37
13.1. CD Servo
37
13.2. Tuner
38
13.3. Main (1/2), Transformer, Sensor & D-Port
39
13.4. Main (2/2), Panel, LED, Power Switch, Tact Switch, Switch
& Motor
40
14 Notes of Schematic Diagrams
41
15 Schematic Diagram
43
15.1. (A) CD Servo Circuit
43
15.2. (B) Tuner Circuit
44
15.3. (C) Main Circuit
45
15.4. (D) Panel Circuit & (E) D-Port Circuit
48
15.5. (F) LED Circuit, (G) Power Switch Circuit, (H) Switch
Circuit & (I) Tact Switch Circuit
49
15.6. (J) Motor Circuit, (K) Sensor Circuit & (L) Transformer
Circuit
50
16 Printed Circuit Board
51
16.1. (A) CD Servo P.C.B. & (B) Tuner P.C.B.
52
16.2. (C) Main P.C.B.
53
16.3. (D) Panel P.C.B., (E) D-Port P.C.B., (F) LED P.C.B., (G)
Power Switch P.C.B. & (H) Switch P.C.B.
54
CONTENTS
Page
Page
2
SC-EN37EB / SC-EN37EG
16.4. (I) Tact Switch P.C.B., (J) Motor Circuit P.C.B., (K) Sensor
Circuit P.C.B. & (L) Transformer P.C.B.
55
17 Illustration of ICs, Transistors and Diodes
57
18 Terminal Function of IC's
58
18.1. IC801 (MN101EF16ZXW) Servo Processor,Digital Signal
Processor/Digital filter and D/A Converter
58
19 Exploded Views
59
19.1. Cabinet Parts Location
61
19.2. Packaging
63
20 Replacement Parts List
65
3
SC-EN37EB / SC-EN37EG
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
.
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.
Fig. 1
4
SC-EN37EB / SC-EN37EG
