Panasonic SC-HC25GS User manual

© Panasonic Corporation 2011. All rights reserved.
Unauthorized copying and distribution is a violation of
law.
PSG1104005CE
Compact Stereo System
Model No. SC-HC25GS
SC-HC25GT
SC-HC25PU
SC-HC25GSX
Product Color: (K)...Black Type
TABLE OF CONTENTS PAGE PAGE
1 Safety Precautions----------------------------------------------- 3
1.1. General Guidelines---------------------------------------- 3
1.2. Caution for AC Cord (For GS/GSX only) ------------ 4
1.3. Before Repair and Adjustment------------------------- 5
1.4. Caution For Fuse Replacement------------------------ 5
1.5. Protection Circuitry---------------------------------------- 5
1.6. Safety Part Information----------------------------------- 6
2 Warning-------------------------------------------------------------- 7
2.1. Prevention of Electro Static Discharge (ESD)
to Electrostatically Sensitive (ES) Devices---------- 7
2.2. Precaution of Laser Diode------------------------------- 8
2.3. Service caution based on Legal restrictions-------- 9
2.4. Handling Precaution for Traverse Deck-------------10
3 Service Navigation----------------------------------------------11
3.1. Service Information --------------------------------------11
4 Specifications ----------------------------------------------------12
5 Location of Controls and Components ------------------13
5.1. Main Unit & Remote Control Key Button
Operations-------------------------------------------------13
5.2. Connections-----------------------------------------------14
5.3. Disc operations-------------------------------------------14
5.4. iPod or iPhone Operation------------------------------15
6 Self Diagnostic and Doctor Mode Setting -------------- 16
6.1. Self Diagnostic Mode -----------------------------------16
6.2. Self Diagnostic Function Error Code---------------- 17
6.3. Doctor Mode Table---------------------------------------18
6.4. Sales Demonstration Lock Function Mode-------- 24
7 Service Fixture & Tools ---------------------------------------25
8 Disassembly and Assembly Instructions---------------26
8.1. Disassembly flow chart---------------------------------27
8.2. Types of Screws------------------------------------------28
8.3. Main Parts Location Diagram------------------------- 28
8.4. Disassembly of Net Frame Assembly--------------- 29
8.5. Disassembly of Base Stand Assembly -------------31

2
8.6. Disassembly of Docking Lid---------------------------31
8.7. Replacement of CD Door Ornament----------------32
8.8. Replacement of CD Door Base-----------------------34
8.9. Disassembly of Front Cabinet Assembly-----------37
8.10. Disassembly of LCD Window -------------------------39
8.11. Disassembly of Gear Box Assembly ----------------41
8.12. Replacement of Rack Top & Slider Top ------------44
8.13. Disassembly of Bridge P.C.B. & Door Switch
P.C.B.--------------------------------------------------------46
8.14. Replacement of Door Shaft & Slider Bottom------48
8.15. Replacement of Timing Gear Shaft------------------50
8.16. Disassembly of Top Ornament Unit & Button
P.C.B.--------------------------------------------------------51
8.17. Disassembly of IR P.C.B. & Panel P.C.B.----------52
8.18. Disassembly of CD Mechanism ----------------------54
8.19. Disassembly of CD Servo P.C.B.---------------------55
8.20. Disassembly of Jack Lid--------------------------------56
8.21. Disassembly of Tuner P.C.B.--------------------------58
8.22. Disassembly of SMPS P.C.B.-------------------------59
8.23. Replacement of Diode (D702)------------------------61
8.24. Replacement of Transistor (Q701)-------------------63
8.25. Disassembly of Docking Tub Unit--------------------64
8.26. Disassembly of Speaker Unit -------------------------68
8.27. Disassembly of Main P.C.B.---------------------------69
9 Service Position-------------------------------------------------71
9.1. Checking & Repairing of Panel P.C.B.--------------71
9.2. Checking & Repairing of CD Servo P.C.B.---------72
9.3. Checking & Repairing of Main (Side B) P.C.B. ---74
9.4. Checking & Repairing of Main (Side A) P.C.B. ---74
9.5. Checking & Repairing of SMPS P.C.B.-------------78
10 Voltage Measurement & Waveform Chart---------------80
10.1. CD SERVO P.C.B. ---------------------------------------80
10.2. MAIN P.C.B. (1/3) ----------------------------------------81
10.3. MAIN P.C.B. (2/3) ----------------------------------------82
10.4. MAIN P.C.B. (3/3) ----------------------------------------83
10.5. PANEL P.C.B. ---------------------------------------------83
10.6. SMPS P.C.B. ----------------------------------------------83
10.7. TUNER P.C.B. --------------------------------------------84
10.8. Waveform Chart ------------------------------------------84
11 Illustration of IC’s, Transistors and Diodes ------------85
12 Overall Simplified Block--------------------------------------87
12.1. Voltage / Current / Ground Diagram-----------------87
12.2. Control & Signal Diagram------------------------------88
13 Block Diagram ---------------------------------------------------89
13.1. SERVO/SYSTEM CONTROL BLOCK
DIAGRAM--------------------------------------------------89
13.2. IC TERMINAL CHART----------------------------------90
13.3. AUDIO BLOCK DIAGRAM ----------------------------91
13.4. POWER SUPPLY (1/2) BLOCK DIAGRAM -------92
13.5. POWER SUPPLY (2/2) BLOCK DIAGRAM -------93
14 Wiring Connection Diagram---------------------------------94
15 Schematic Diagram---------------------------------------------95
15.1. Schematic Diagram Notes-----------------------------95
15.2. CD SERVO CIRCUIT (1/2) ----------------------------97
15.3. CD SERVO CIRCUIT (2/2) ----------------------------98
15.4. MAIN CIRCUIT (1/4) ------------------------------------99
15.5. MAIN CIRCUIT (2/4) ---------------------------------- 100
15.6. MAIN CIRCUIT (3/4) ---------------------------------- 101
15.7. MAIN CIRCUIT (4/4) ---------------------------------- 102
15.8. MAIN (USB/iPod) CIRCUIT-------------------------- 103
15.9. iPhone, TUNER & MOTOR CIRCUIT------------- 104
15.10. PANEL, IR, DOOR SWITCH, BRIDGE &
BUTTON CIRCUIT-------------------------------------105
15.11. SMPS CIRCUIT-----------------------------------------106
16 Printed Circuit Board-----------------------------------------107
16.1. CD SERVO P.C.B.--------------------------------------107
16.2. MAIN P.C.B. (Side A)----------------------------------108
16.3. MAIN P.C.B. (Side B)----------------------------------109
16.4. iPhone, TUNER & MOTOR P.C.B. -----------------110
16.5. PANEL, IR, DOOR SWITCH, BRIDGE &
BUTTON P.C.B.----------------------------------------- 111
16.6. SMPS P.C.B.---------------------------------------------112
17 Terminal Function of IC’s -----------------------------------113
17.1. IC801 (RFKWMHC25M0) MICRO
PROCESSOR IC ---------------------------------------113
18 Exploded View and Replacement Parts List----------115
18.1. Exploded View and Mechanical replacement
Parts List--------------------------------------------------115
18.2. Electrical Replacement Parts List ------------------121

3
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, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, carry out the following leakage current checks to prevent the customer 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. measure the resistance value, with an ohmmeter 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 5.2MΩ. When the exposed metal does not have a return path to the chas-
sis, the reading must be
1.1.2. Leakage Current Hot Check
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. In case a measurement is outside 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.
Figure. 1

4
1.2. Caution for AC Cord (For GS/GSX only)

5
1.3. Before Repair and Adjustment
Disconnect AC power, discharge unit AC Capacitors as such C702, C710, C725, C727 and C728 through a 10W, 1W resistor to
ground.
Caution : 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 110 to 240V, at 50/60Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~200
mA. (For GS/GSX/PU only)
• Current consumption at AC 110V, at 60Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~200 mA. (For GT
only)
1.4. Caution For Fuse Replacement
1.5. 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.

6
1.6. 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, Exploded View & 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.
Safety Ref. No. Part No. Part Name & Description Remarks
300 RAEX1034Z-V TRAVERSE ASS’Y
A2 K2CA2CA00027 AC CORD GT
A2 K2CA2YY00039 AC CORD PU
A2 K2CP2CA00001 AC CORD GS/GSX
A2 K2CQ2CA00007 AC CORD GS/PU/GSX
A2 K2CZ3YY00005 AC CORD GS/GSX
A3 RQTX1251-M O/I BOOK (Sp) PU
A3 RQTX1255-G O/I BOOK (En/Cn/Ar) GS/GSX
A3 RQTX1258-K O/I BOOK (Co) GT
26 RGNX1225B-K NAME PLATE PU
26 RGNX1225E-K NAME PLATE GS/GSX
26 RGNX1225H-K NAME PLATE GT
C702 F0CAF104A105 0.1uF
C710 F1H1C104A120 0.1uF 16V
C725 F0CAF104A105 0.1uF
C727 F1BAF1020020 1000pF
C728 F1BAF1020020 1000pF
F751 K5G312Y00007 FUSE PROTECTOR
L702 G0B183E00004 LINE FILTER
P751 K2AA2B000011 AC INLET
PC701 B3PBA0000503 PHOTO COUPLER
PC702 B3PBA0000503 PHOTO COUPLER
PCB10 REPX0917J SMPS P.C.B. (RTL)
SW1 D4FB1R250006 RESETTABLE FUSE
SW7900 D4FBR5000009 RESETTABLE FUSE
T701 ETS28BT11GAC TRANSFORMER
TH701 D4CAA5R10001 THERMISTOR
TH702 D4CC11040013 THERMISTOR
Z752 ERZVA5Z471 ZNR

7
2Warning
2.1. Prevention of Electro Static Discharge (ESD) to Electrostatically Sensi-
tive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec-
trostatically 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 electrostatic 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 alumin-
ium 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 sufficient 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 compara-
ble 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 bodily 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) suf-
ficient to damage an ES device).

8
2.2. Precaution of Laser Diode
Caution:
This product utilizes a laser diode with the unit turned "on", invisible laser radiation is emitted from the pickup lens.
Wavelength: 790 nm (CD)
Maximum output radiation power from pickup: 100 μW/VDE
Laser radiation from the pickup unit is safety level, but be sure the followings:
1. Do not disassemble the pickup unit, since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pickup unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Recommend not to look at pickup lens for a long time.
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.

9
2.3. Service caution based on Legal restrictions
2.3.1. 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
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%
The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder.
(See right figure)

10
2.4. Handling Precaution for Traverse Deck
The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be
taken avoid caution to electrostatic breakdown when servicing and handling the laser diode in the Traverse Deck.
2.4.1. Cautions to Be Taken in Handling the Optical Pickup Unit
The laser diode in the optical pickup unit may be damaged due to electrostatic discharge generating from clothes or human body.
Special care must be taken avoid caution to electrostatic discharge damage when servicing the laser diode.
1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.
2. To prevent the laser diode from the electrostatic discharge damage, the flexible cable of the optical pickup unit removed
should be short-circuited with a short pin or a clip.
3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the flexible cable.
4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexi-
ble cable, cut off the antistatic FPC.
Figure 1
2.4.2. Grounding for electrostatic breakdown prevention
Some devices such as the CD player use the optical pickup (laser diode) and the optical pickup will be damaged by static electricity
in the working environment. Proceed servicing works under the working environment where grounding works is completed.
2.4.2.1. Worktable grounding
1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.
2.4.2.2. Human body grounding
1. Use the anti-static wrist strap to discharge the static electricity form your body (Figure 2).
Figure 2

11
3 Service Navigation
3.1. Service Information
This service manual contains technical information which will allow service personnel’s to understand and service this model.
Please place orders using the parts list and not the drawing reference numbers.
If the circuit is changed or modified, this information will be followed by supplement service manual to be filed with original service
manual.
•Micro-processor:
1) The following components are supplied as an assembled part.
- Micro-processor IC, (IC801) (RFKWMHC25M0)

12
4 Specifications
QAmplifier Section
RMS Output Power Stereo Mode
Front Ch (both channels driven) 5 W per channel (6 Ω), 1 kHz,
10 % THD
Total RMS stereo mode power 10 W
PMPO output power 95 W
QFM/AM tuner, terminals section
Preset station FM 30 stations
AM 15 stations
Frequency modulation (FM)
Frequency range 87.50 MHz to 108.00 MHz
(50 kHz step)
Antenna terminals 75 Ω(unbalanced)
Amplitude modulation (AM)
Frequency range 522 kHz to 1629 kHz
(9 kHz step)
520 kHz to 1630 kHz
(10 kHz step)
Headphone jack
Terminal Stereo, 3.5 mm jack
Aux (rear)
Terminal Stereo, 3.5 mm jack
QDisc Section
Disc played [8 cm or 12 cm ]
CD, CD-R/RW (CD-DA, MP3* formatted disc)
* MPEG-1 Layer 3, MPEG-2 Layer 3
Pick up
Wavelength 790 nm (CD)
Laser power CLASS I(CD)
Audio output (Disc)
Number of channels 2 ch (FL, FR)
FL = Front left channel
FR = Front right channel
QUSB 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)
QSpeaker Section
Type 1 way, 1 speaker system
(Bass reflex)
Speaker unit(s)
Full range 8 cm Cone type
Impedance 6 Ω
Frequency range 60 Hz to 25 kHz (-16 dB)
90 Hz to 22 kHz (-10 dB)
QGeneral
Power supply (For GS/GSX/PU
only) AC 110 to 240 V, 50/60 Hz
Power supply (For GT only) AC 110 V, 60 Hz
Power consumption
(For GS/GSX/PU only) 19 W
Power consumption
(For GT only) 18 W
(Total harmonic distortion 1%,
AC 110 V) (For GT only) 28 W
Dimensions (W x H x D) 400 mm x 221 mm x 110 mm
[D = 69 mm (min)]
[D = 149 mm (tray open)]
Mass (weight) 2.1 kg
Operating temperature range 0°C to +40°C
Operating humidity range 35% to 80 % RH
(no condensation)
Power consumption in standby mode: 0.2 W (approximate)
(For GS/PU only)
Power consumption in standby mode: 0.1 W (approximate)
(For GT only)
• Specifications are subject to change without notice. Mass and
dimensions are approximate.
• Total harmonic distortion is measured by the digital spectrum ana-
lyzer.

13
5 Location of Controls and Components
5.1. Main Unit & Remote Control Key Button Operations

14
5.2. Connections
5.3. Disc operations

15
5.4. iPod or iPhone Operation
Compatibility iPod/iPhone
• For compatibility of iPod/iPhone please refer to Operating Instructions

16
6 Self Diagnostic and Doctor Mode Setting
This unit is equipped with features of self diagnostic & doctor mode setting for checking the functions & reliability.
6.1. Self Diagnostic Mode
Here is the procedures to enter into Self Diagnostic Mode.
Step 1 : Turn on the unit.
Step 2 : Select CD mode.
Step 3 : Press and hold [Q] button for 2 seconds follow by [ ] on the unit.
Step 4 : The display show as follow.
To exit the Self Diagnostic Mode
Use either one of the following methods to cancel the Self Diagnostic Mode.
• Press the power button on the main unit or using the remote control.
• Unplug the AC cord.
6.1.1. Self Diagnostic Table
Self Diagnostic Mode To enter into self diagnostic
checking
Item FL display Key operation
Mode name Description
Error code information
Delete Error code
Example:
System will perform a check on
any unusual/error code from the
memory
To clear the stored in memory
(EEPROM IC)
Step 1 : Select CD mode
(Ensure no disc is inserted).
Step 2 : Press and hold [ ] follow by
[ ] on main unit for 2
second .
Step 1 : In self diagnostic mode,
Press [STOP] on main unit.
To exit, press [TA] on main
unit or remote control.
Step 1 : In self diagnostic mode,
Press [0] on remote control.
To exit, press [TA] on main
unit or remote control.

17
6.2. Self Diagnostic Function Error Code
6.2.1. CD Mechanism Error Code Table
6.2.2. Power Amp Error Code Table
Error Code Diagnostic Contents Descriptionof error Automatic FL Display Remarks
CD H15 CD Open Abnormal During operation
POS_SW_R On fail to be
detected with 4 sec. Error
No. shall be clear by force
or during cold start.
Press [ ] on main unit for
next error.
CD H16 CD Closing Abnormal During operation
POS_SW_CEN On fail to
be detected with 4 sec.
Error No. shall be clear by
force or during cold start.
Press [ ] on main unit for
next error.
F26 Communication between
CD servo LSI and micro-p
abnormal.
During switch to CD func-
tion, if SENSE = “L” within
failsafe time of 20ms.
Press [ ] on main unit for
next error.
Error Code Diagnostic Contents Descriptionof error Automatic FL Display Remarks
F61/F76 Power Amp IC output
abnormal
During power-on, PDET1,
PDET2 & MAINV_DET /
TEMP_DET is “L” after 1
sec.
Press [ ] on main unit for
next error.

18
6.3. Doctor Mode Table
Here is the procedures to enter into Doctor Mode.
Step 1 : Turn on the unit.
Step 2 : Select CD mode.
Step 3 : Pressing and hold [Q] on main unit then press [4] follow by [7] using the remote control.
Step 4 : The display show as follow.
To exit the Doctor mode
Use either one of the following methods to cancel the Doctor mode.
• Press the power button of the unit or using the remote control.
• Unplug the AC cord.
6.3.1. Doctor Mode Table 1
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 ver-
sion.
Note: The micro-processor
version as shown is an
example. It will be revise
when there is an updates.
FL Display sequence Dis-
play 1 ¡2
(Display 1)
Checksum : (Condition 1)
Checksum : (Condition 2)
Checksum : (Condition 3)
(Display 2)
The Checksum of EEPROM and firmware
version will be display for 2 sec.
In any mode:
Press [ ] button on main unit follow by
[4] & then [7] on remote control.
To exit Doctor Mode, press [TA]button
on main unit or remote control.
Version Display
(DEC)
Check sum
(HEX)
Version Display
(DEC)
No Rom correction
When EEPROM is not detected, it shall
display only firmware version
When EEPROM is detected the version
of the EEPROM does not match or not
working properly [NG] is display.
When EEPROM is detected, it shall
display the [YYYY].

19
6.3.2. Doctor 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:
Press [1] button on remote control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
Volume Setting In Doctor Mode:
Press [7] button on remote control.
In Doctor Mode:
Press [8] button on remote control.
In Doctor Mode:
Press [9] button on remote control.
Mecha Sliding Panel
Reliability
In Doctor Mode:
Press [ ] follow by [2] & then [1]
button on remote control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
CD Traverse Test
Mode
To check for the traverse unit
operation. In this mode, the
first & last track is access &
read. (TOC). It fails when
TOC is not completed by 10s
or the traverse is out of
focus. for more than 2s
Refer to 6.3.6 for more
information
In Doctor Mode:
Press [ ] follow by [1] & then [2]
button on remote control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
To exit Doctor Mode, press but-
ton on main unit or remote control.
To exit Doctor Mode, press but-
ton on main unit or remote control.
To exit Doctor Mode, press but-
ton on main unit or remote control.
To check the operation of
sliding Panel.
Sequence as follow :
1. CD Door set to CLOSE
position.
2. CD Door move to the left
(CD Open direction) and
stop at LEFT position for 1
sec.
3. CD Door move to the
right (CD Close direction)
and stop at CLOSE position
for 1 sec.
4. All the process above is
considered as 1 cycle. Step
(2) ~ (3) will repeat; Cycle
Counter display increase
every 1 cycle completed.
Refer to 6.3.5 for more
information
To check for preset volume
setting
Note : In tuner mode this
function is not possible
The counter will increment by 1 until reach
99999999

20
6.3.3. Doctor Mode Table 3
Version Display
(DEC)
Check sum
(HEX)
noitarepOyeKyalpsiDLFmetI
Mode Name Description Front Key
Cold Start
The [NO DISC] display will appear after 3s,
EEPROM not detected only firmware is display
To display result of self
adjustment for CD.
The [NO DISC] display will appear after 3s,
In Doctor Mode:
Press [ ] follow by [1] & then [4]
button on remote control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
In Doctor Mode:
Press [ ] follow by [1] & then [5]
button on remote control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
In Doctor Mode:
Press [SLEEP] button on remote
control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
In Doctor Mode:
Press [ ] follow by [2] & then [2]
button on remote control.
To cancel, press [0] button on remote
control. It returns Doctor Mode.
To exit Doctor Mode, press but-
ton on main unit or remote control.
CD Self-Adjusment
Display
CD Combination Test esolc/nepoehtkcehcoT
operation & inner outer disc
access operation.
1. It fails when CD
open/close is not completed
by 4s.
2. The disc access fails in
10s.
3. The traverse is out of
focus for more than 2s.
Refer to 6.3.7 for more
information
To activate cold start upon
next power up.
(Backup data are initialized)
EEPROM Checksum To check sum of EEPROM
for a simplifield ROM
correction.
1. When EEPROM is not
detected, the only micro-p’s
version shall be displayed
without an EEPROM’s
check sum
Auto Power down
Detect (APD) Test
To check for the auto power
down operation
Condition 1 (when APD is OK)
Condition 2 (when APD is abnormal operation)
In any mode:
Press
[ ] button on main unit follow by
[4] & then [7] on remote control.