Panasonic SA-NS55E User manual

nAmplifier Section
RMS OUTPUT POWER both channel
driven simultaneously
10 % Total harmonic distortion
15 W per channel (6 Ω)
Input impedance
MUSIC PORT 12 KΩ
Output impedance
HEADPHONE 16 to 32 Ω
Phone jack
Terminal Stereo, 3.5 mm
Music Port input jack
Terminal Stereo, 3.5 mm
nFM Tuner Section
Frequency range 87.5 to 108.00 MHz (50 kHz step)
Sensitivity 0.10 µV (IHF)
S/N 26 dB 1.20 µV
A
ntenna terminals 75 Ω(unbalanced)
Preset station FM 20 stations
AM 15 stations
nAM Tuner Section
Frequency range 522 to 1629 kHz (9 kHz steps)
520 to 1630 kHz (10 kHz steps)
Sensitivity
S/N 20 dB (at 999 kHz) 1000 µV/m
©2007 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-NS55E
SA-NS55EG
Colour
(S)... Silver Type
nCD Section
Disc played [8 cm or 12 cm]
(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3 formatted disc)
(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
Pickup
Wavelength 785 nm
Beam source Semiconductor laser
Laser power CLASS 1
A
udio output (Disc)
Number of channels 2 channel
Frequency response 20 Hz to 20 kHz (+1, -2dB)
Wow and flutter Below measurable limit
Digital filter 8fs
D/A converter MASH (1 bit DAC)
nUSB Section
Playable USB Storage Media
(1) HDD
(2) USB MP3 player/Digital audio player
(3) USB Thumbdrives
CD Stereo System
Specification
ORDER NO. MD0703016CE

Supported audio file format
MP3 Bit rate
USB memory port
Maximum current 500mA
Bit rate
MP3 32 kbps, 128 kbps, 320 kbps
A
udio output (MP3)
Number of channels 2 channel
Frequency response (MP3) 1 kHz to 10 kHz (0+/-1.0 dB)
nGeneral
Power supply AC 230 V, 50 Hz
Power consumption 54 W
Dimensions (W x H x D) 212 mm x 184 mm x 308 mm
1 Safety Precautions 4
1.1. General Guidelines 4
1.2. Before Repair and Adjustment 5
1.3. Protection Circuitry 5
1.4. Safety Part Information 5
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 6
3 Precaution of Laser Diode 7
4 Handling Precautions For Traverse Deck 8
5 Handling the Lead free Solder 9
5.1. General description about Lead Free Solder (PbF) 9
6 Accessories 10
7 Operation Procedures 11
7.1. Main Unit Key Buttons Operation 11
7.2. Remote Control Key Buttons Operation 11
7.3. Disc Information 12
8 Self diagnosis and special mode setting 13
8.1. Service Mode Summary Table 13
8.2. Service Mode Table 13
8.3. Error Code Table 16
9 Assembling and Disassembling 17
9.1. Caution 17
9.2. Disassembly flow chart 18
9.3. Main Parts Location Diagram 19
9.4. Disassembly of Top Cabinet Unit 20
9.5. Disassembly of D-Port and HP / Music Port P.C.B. 21
9.6. Disassembly of USB P.C.B. 21
9.7. Disassembly of Tuner Pack 22
9.8. Disassembly of Rear Cabinet Unit 23
9.9. Disassembly of Power and AC Inlet P.C.B. 23
9.10. Disassembly of Transformer P.C.B. 24
Mass 3.5 kg
Operating temperature range +5 to +35°C
Operation humidity range 5 to 90% RH (no condensation)
Power consumption in standby
mode
0.7 W (approx.)
Notes :
1. Specifications are subject to change without notices. Mass and
dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
nSystem : SC-NS55E-S Music center: SA-NS55E-S
Speaker: SB-NS55EG-S
nSystem : SC-NS55EG-S Music center: SA-NS55EG-S
Speaker: SB-NS55EG-S
9.11. Disassembly of Front Panel 25
9.12. Disassembly of Panel P.C.B. 25
9.13. Disassembly of Main P.C.B. 26
9.14. Disassembly of Switch P.C.B. 26
9.15. Disassembly of Motor P.C.B. 27
9.16. Disassembly of Gear Box 28
9.17. Disassembly of CD Loading Block 28
9.18. Disassembly of CD Mechanism 30
9.19. Disassembly of Traverse Unit, Driving Gear, and Cam
Gear (CD Mechanism Unit) 32
10 Service Positions 36
10.1. Checking and Repairing of HP / Music Port, D-Port and
USB (side B) P.C.B. 36
10.2. Checking and Repairing of Panel P.C.B. 37
10.3. Checking and Repairing of Switch and Motor P.C.B. 38
10.4. Checking and Repairing Transformer P.C.B. 39
10.5. Checking and Repairing Power and AC Inlet P.C.B. 40
10.6. Checking and Repairing Main P.C.B. 41
10.7. Checking and Repairing CD Servo P.C.B. 42
11 Voltage Measurement & Waveform Chart 43
11.1. Voltage Measurement 43
11.2. Waveform Chart 48
12 Wiring Connection Diagram 49
13 Block Diagram 51
13.1. CD SERVO/ OPTICAL PICKUP UNIT 51
13.2. MAIN(1/2)/ TUNER EXTENT/ PANEL/ D PORT/ MOTOR/
SWITCH 52
13.3. MAIN(2/2)/ USB MODULE/ HP/MUSIC PORT/
POWER/TRANSFORMER/ AC INLET 53
14 Notes Of Schematic Diagram 55
15 Schematic Diagram 57
CONTENTS
Page Page
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SA-NS55E / SA-NS55EG

15.1. CD SERVO CIRCUIT 57
15.2. MAIN CIRCUIT 58
15.3. PANEL CIRCUIT 61
15.4. TUNER EXTENT CIRCUIT, HP / MUSIC PORT CIRCUIT
and D-PORT CIRCUIT 62
15.5. USB CIRCUIT 63
15.6. POWER CIRCUIT 64
15.7. MOTOR CIRCUIT and SWITCH CIRCUIT 65
15.8. TRANSFORMER CIRCUIT and AC INLET CIRCUIT 66
16 Printed Circuit Board 67
16.1. CD SERVO P.C.B and USB P.C.B 67
16.2. TUNER EXTENT P.C.B, MAIN P.C.B, HP/MUSIC PORT
P.C.B and MOTOR P.C.B 68
16.3. PANEL P.C.B and D-PORT P.C.B 69
16.4. POWER P.C.B, SWITCH P.C.B, TRANSFORMER P.C.B
and AC INLET P.C.B 70
17 Illustration of IC's, Transistors and Diodes 71
18 Terminal Function of IC's 72
18.1. IC7001 (MN6627954MA) IC SERVO
PROCESSOR/DIGITAL SIGNAL PROCESSOR/DIGITAL
FILTER D/A CONVERTER 72
18.2. IC7002 (BA5948FPE2) IC 4CH Drive 73
18.3. IC807 (MN101EF16ZXW) MICROPROCESSOR 73
19 Exploded Views 75
19.1. Cabinet Parts Location & Traverse Part Location 75
19.2. Packaging 77
20 Replacement Parts List 79
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SA-NS55E / SA-NS55EG

1.1.2. Leakage Current Hot Check
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, 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 1MΩand 5.2Ω.
When the exposed metal does not have a return path to the chassis, the reading must be .
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 capacitors, 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 outside of the limits
specified, there is a possibility of a shock hazard, and the equipment should be repaired and re-checked before it is returned
to the customer.
Fig. 1
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SA-NS55E / SA-NS55EG

1.2. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C321, C322, C323, C324, C325, C507, C520 and C611 through a 10Ω,
1W 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 230 V, 50 Hz in NO SIGNAL mode should be ~200 mA.
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. 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
A2 K2CQ2CA00002 AC CORD [M]
L270 G0AR76Y00003 CHOKE COIL [M]
L271 G0AR76Y00003 CHOKE COIL [M]
L470 G0AR76Y00003 CHOKE COIL [M]
L471 G0AR76Y00003 CHOKE COIL [M]
L500 G0B371HA0005 LINE FILTER [M]
T501 G4CYAYY00148 TRANSFORMER [M]
T502 G4CYAYY00137 SUB TRANSFORMER [M]
Z500 ERZV10V511CS ZENER [M]
JK500 K2AA2B000011 JK AC INLET [M]
RL501 K6B1AEA00015 POWER RELAY [M]
F1 K5D631BLA012 FUSE [M]
FP502 K5G202A00044 FUSE PROTECTOR [M]
FP600 K5G502A00039 FUSE PROTECTOR [M]
FP601 K5G502A00039 FUSE PROTECTOR [M]
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SA-NS55E / SA-NS55EG

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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SA-NS55E / SA-NS55EG

3 Precaution of Laser Diode
Caution :
This product utilizes a laser diode with the unit turned "ON", invisible laser radiation is emitted from the pick up lens.
Wavelength : 780 nm
Maximum output radiation power from pick up : 100 µW/VDE
Laser radiation from pick up unit is safety level, but be sure the followings:
1. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Recommend not to look at pick up lens for a long time.
ACHTUNG :
Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheit
abgestrahlt.
Wellenlänge : 780nm
Maximale Strahlungsleistung der Lasereinheit :100 µW/VDE
Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte beachtet werden:
1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist.
2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.
3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.
4. Nicht über längere Zeit in die Fokussierlinse blicken.
ADVARSEL :
I dette a apparat anvendes laser.
CAUTION!
THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.
nUse of Caution Labels
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SA-NS55E / SA-NS55EG

The laser diode in the traverse deck (optical pickup) may break
down due to potential difference caused by static electricity of
clothes or human body.
So, be careful of electrostatic breakdown during repair of the
traverse deck (optical pickup).
lHandling of CD traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to
static electricity as it is extremely sensitive to electrical
shock.
2. The short land between the No.4 (LD) and No.5 (GND)
pins on the flexible board (FFC) is shorted with a solder
build-up to prevent damage to the laser diode.
3. Take care not to apply excessive stress to the flexible
board (FFC board) (Fig 4.1).
4. Do not turn the variable resistor (laser power
adjustment). It has already been adjusted.
Fig 4.1
lGrounding for electrostatic breakdown prevention
1. Human body grounding (Fig 4.2)
Use the anti-static wrist strap to discharge the static
electricity from your body.
2. Work table grounding (Fig 4.2)
Put a conductive material (sheet) or steel sheet on the
area where the traverse deck (optical pickup) is placed,
and ground the sheet.
Caution :
The static electricity of your clothes will not be grounded
through the wrist strap. So, take care not to let your
clothes touch the traverse deck (optical pickup).
Fig 4.2
Caution when Replacing the Optical Pickup :
The traverse has a short point shorted with solder to protect
the laser diode against electrostatics breakdown. Be sure to
remove the solder from the short point before making
connections.
4 Handling Precautions For Traverse Deck
8
SA-NS55E / SA-NS55EG

5 Handling the Lead free Solder
5.1. General description about Lead Free Solder (PbF)
The lead free solder has been used in the mounting process of all electrical components on the printed circuit boards used for this
equipment in considering the globally environmental conservation.
The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy mainly consists of tin
(Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86°F) more than that
of the normal solder.
Definition of PCB Lead Free Solder being used
The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder.
(See right figure)
Service caution for repair work using Lead Free Solder (PbF)
· The lead free solder has to be used when repairing the equipment for which the lead free solder is used.
(Definition: The letter of “PbF” is printed on the PCB using the lead free solder.)
· To put lead free solder, it should be well molten and mixed with the original lead free solder.
· Remove the remaining lead free solder on the PCB cleanly for soldering of the new IC.
· Since the melting point of the lead free solder is higher than that of the normal lead solder, it takes the longer time to melt
the lead free solder.
· Use the soldering iron (more than 70W) equipped with the temperature control after setting the temperature at 350±30
degrees C (662±86°F).
Recommended Lead Free Solder (Service Parts Route.)
· The following 3 types of lead free solder are available through the service parts route.
RFKZ03D01K-----------(0.3mm 100g Reel)
RFKZ06D01K-----------(0.6mm 100g Reel)
RFKZ10D01K-----------(1.0mm 100g Reel)
Note
* Ingredient: Tin (Sn), 96.5%, Silver (Ag) 3.0%, Copper (Cu) 0.5%, Cobalt (Co) / Germanium (Ge) 0.1 to 0.3%
9
SA-NS55E / SA-NS55EG

Remote control
AC cord
AM loop antenna
FM antenna
6 Accessories
Note : Refer to Packing Materials & Accessories (Section 20) for part number.
10
SA-NS55E / SA-NS55EG

7 Operation Procedures
7.1. Main Unit Key Buttons Operation
7.2. Remote Control Key Buttons Operation
11
SA-NS55E / SA-NS55EG

7.3. Disc Information
12
SA-NS55E / SA-NS55EG

8 Self diagnosis and special mode setting
This unit is equipped with features of self-diagnostic & special mode setting for checking the functions & reliability.
8.1. Service Mode Summary Table
The service modes can be activated by pressing various button combination on the main unit and remote control unit.Below is the
summary for the various modes for checking:
Player buttons Remote control unit buttons Application Note
[STOP] [4], [7] Entering into Doctor Mode (Refer to the section 8.2. for more information.)
Player buttons Remote control unit buttons Application Note
In Doctor Mode [DIMMER] FL ALL Segment inspection (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[7] Volume 50 setting check (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[8] Volume 29 setting check (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[9] Volume 0 setting check (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[ ], [1], [1] CD Reliability Test (Loading) (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[ ], [1], [2] CD Reliability Test (Traverse) (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[ ], [1], [3] CD Reliability Test (Combination) (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[ ], [1], [4] CD Auto Adjustment Display (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
[SLEEP] Cold Start Setting (Refer to the section 8.2. service mode
Table 1 & 2 for more information.)
8.2. Service Mode Table
Below is the various special modes for checking:-
8.2.1. Service mode Table 1
Item FL Display Key Operation
Mode Name Description Front Key
Self -Diagnostic
Mode
To enter into self
diagnostic checking for
main unit.
1. Select [ ] for CD mode (Ensure no
CD inserted).
2. Press and hold [ ]button for 2
seconds follow by [ ].
To exit Doctor Mode, press button on
main unit or remote control.
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SA-NS55E / SA-NS55EG

Item FL Display Key Operation
Mode Name Description Front Key
Doctor Mode To enter into Doctor
Mode for checking of
various items and
displaying EEPROM and
firmware version.
Note: The micro-
processor version as
shown is an example. It
will be revise when there
is an updates.
FL display sequence
Display 1 →2
(Display 1)
Checksum : (Condition 1)
(a) If there is NO EEPROM header string
OR
(b) If there is no EEPROM ( no data is
received by micro-processor) [NO] is
displayed.
Checksum : (Condition 2)
If the version of the EEPROM does not
match or not working properly [NG] is
display.
Checksum : (Condition 3)
If the EEPROM version matches, checksum
[YYYY] is displayed.
(Display 2)
The Check Sum of EEPROM and firmware
version will be display for 2 sec.
In any mode:
1. Press [ ] button on main unit follow
by [4] and [7] on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
8.2.2. Service mode Table 2
Item FL Display Key Operation
Mode Name Description Front Key
FL Display Test To check the FL
segments display (All
segments will light up)
In doctor mode:
1. Press [DIMMER] button on remote control.
To cancel, press [0] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
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SA-NS55E / SA-NS55EG

Item FL Display Key Operation
Mode Name Description Front Key
Volume Setting Check for the volume
setting of the main unit.
The volume will be
automatically set to its
respective level (in dB)
during the mode,
treble/bass/EQ will be set
to ‘0’dB & OFF.
Display 1 In doctor mode:
1. Press [7] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
Display 2 In doctor mode:
2. Press [8] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
Display 3 In doctor mode:
3. Press [9] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
CD Reliability
Test (Loading)
To determine the
reliability of CD Loading
Unit.
To check for the open /
close operation for the
CD loading unit. It fails
when there is
abnormality in opening or
closing.
In doctor mode:
1. Press [ ], [1], [1] button on remote
control.
To cancel, press [0] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
CD Reliability
Test (Traverse)
To check for the traverse
unit operation, In this
made, the first & lost
track is access & read
(TOC). It fails when TOC
is not completed by IDS
or the traverse is out of
focus.
In doctor mode:
1. Press [ ], [1], [2] button on remote
control.
To cancel, press [0] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
CD Reliability
Test
(Combination)
A combination of CD
loading & Traverse unit
test.
In doctor mode:
1. Press [ ], [1], [3] button on remote
control.
To cancel, press [0] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
CD Auto
Adjustment
Display
To display result of self-
adjustment for CD.
In doctor mode:
1. Press [ ], [1], [4] button on remote
control.
To exit Doctor Mode, press button on
main unit or remote control.
Cold Start To activate cold start
ipon next AC power up.
In doctor mode:
1. Press [SLEEP] button on remote control.
To exit Doctor Mode, press button on
main unit or remote control.
8.2.3. CD Self-Adjustment (AJST) Result Display
Purpose : To check the result of self-adjustment for CD.
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SA-NS55E / SA-NS55EG

Below is the procedures for this mode.
Step 1: Enter into Doctor mode.
(For more information, refer to section 8.2 on key operation to enter into this mode).
Step 2: Press [ ], [1], [4] button on remote control. It enter into CD Self-Adjustment Test mode. (During this mode the result shall
correspond to the condition as shown in the table below).
8.3. Error Code Table
Self-Diagnosis Function provides information on any problems occuring for the unit and its respective components by displaying
error codes. Thesed error code such as U**, H** and F** are stored in memory and held unless it is cleared.
The error code is automatically display after entering into self-diagnostic mode.
Error Code Diagnosis Contents Description of error Automatic FL Display Remarks
F15 CD REST SW
Abnormal
CD traverse position intial
setting operation failsafe
counter (1000 ms) waiting
for REST SW to turn on.
Error No. shall be clear by
force or during cold start.
For CD unit (For Traverse).
Press [ ] on main unit for next
error.
H15 CD Open SW
Abnormal
During normal operation
CD OPEN SW On fail to
be detected with 4 sec.
Error No. shall be clear by
force or during cold start.
For CD unit (For Traverse).
Press [ ] on main unit for next
error.
F26 Communication
between CD servo
LSI and micro-p
abnormal.
CD function DTMS
command, after system
setting, If SENSE = ´L´
cannot be detected.
Memory shall contain F26
code. After Power on, CD
function shall continue,
error display shall be "NO
DISC". Error No. shall be
clear by force or cold start.
For CD unit (For Traverse).
Press [ ] on main unit for next
error.
F61 Power Amp IC output
abnormal
During normal operation, if
DCDET becomes "L",
normal POWER OFF
process shall not be
executed, PCONT shall be
switched to "L"
immediately. "GOODBYE"
shall not be display but the
error display F61 is
displayed instead. 2
seconds after the F61
displayed, ECONO shall be
set to "L" and FL display
shall be turned off. The
error content shall be
memorized when the
abnormality occurs and can
be display in the C-mecha
self-diagnostic mode
described later.
For Power Supply Related Error
Detection.
Press [ ] on main unit for next
error.
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SA-NS55E / SA-NS55EG

9 Assembling and Disassembling
9.1. Caution
“ATTENTION SERVICER”
Some chassis components may be have sharp edges. Be careful when disassembling and servicing.
1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the main
components.
2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.
3. Select items from the following index when checks or replacement are required.
Warning:
This product uses a laser diode. Refer to “Precaution of Laser Diode”.
ACHTUNG:
Die Lasereinheit nicht zerlegen.
Die Lasereinheit darf nur gegen eine vom Hertsteller spezifizierte Einheit ausgetauscht werden.
Below is the list of disassembly sections
· Disassembly of Top Cabinet Unit
· Disassembly of D-Port and HP / Music Port P.C.B.
· Disassembly of USB P.C.B.
· Disassembly of Tuner Pack
· Disassembly of Rear cabinet Unit
· Disassembly of Power and AC Inlet P.C.B.
· Disassembly of Transformer P.C.B.
· Disassembly of Front Panel
· Disassembly of Panel P.C.B.
· Disassembly of Main P.C.B.
· Disassembly of Switch P.C.B.
· Disassembly of Motor P.C.B.
· Disassembly of Gear Box
· Disassembly of CD Loading Block
· Disassembly of CD Mechanism
· Disassembly of Traverse Unit, Driving Gear, and Cam Gear (CD Mechanism Unit)
17
SA-NS55E / SA-NS55EG

9.2. Disassembly flow chart
The following chart is the procedure for disassembling the casing and inside parts for internal inspection when carrying out the
servicing.
To assemble the unit, reverse the steps shown in the chart below.
18
SA-NS55E / SA-NS55EG

9.3. Main Parts Location Diagram
19
SA-NS55E / SA-NS55EG

9.4. Disassembly of Top Cabinet
Unit
Step 1: Remove 4 screws.
Step 2: Press gently down and push outward as per
arrow shown (Be careful of Catches)
Step 3: Pull backward and lift up the Top Cabinet
as arrow shown. (Be careful of Claws)
Step 4: Detach cable (CN802, CN803A and
CN806B) on Main P.C.B..
Step 5: Remove Top Cabinet as arrow shown.
20
SA-NS55E / SA-NS55EG