Panasonic SCEN-33-PC Service manual

ORDER NO. MD0703020CE

CD Stereo System

SC-EN33PC

Colour

(S)... Silver Type

System

SC-EN33PC-S

Main Unit: SA-EN33PC-S

Speakers: SB-EN33APC-S (L) & SB-EN33PC-S (R)

Specifications

n AMPLIFIERSECTION

FTC OUTPUT POWERboth channel driven simultaneousl

10% total harmonic distortion (THD)

1 kHz 1.8 W per channel

RMS OUTPUT POWERboth channel driven simultaneousl

10% total harmonic distortion (THD)

1 kHz 2 W per channel

Outputimpedance

HEADPHONE 16 W to 32 W

MUSIC PORT 14 kW

Phone Jack

Terminal 3.5 mm stereo

Music Port Jack

Terminal 3.5 mm stereo

n TUNER SECTION

Frequencyrange

FM 87.9 MHz to 107.9 MHz (200 kHz)

87.5 MHz to 108.0 MHz (100 kHz)

AM 520 kHz to 1710 kHz (10 kHz)

n CD SECTION

Disc played [8cm (3”) or 12cm (5”)]

(1) CD-Audio (CD-DA)

(2) CD-R/RW (CD-DA, MP3)

(3) MP3

Sampling frequenc

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

udioOutput(Disc)

Number ofchannels 2 channel

Frequencyresponse 20 Hz to 20 kHz (+1, -2 dB)

Wow and flutter Below measurement limit

Digital filter 8

D/Aconverte

n GENERA

Power suppl

Power consumption 30 W

Dimension (WxHXD) 220mmx236mmx146 mm

(8 21/32” x 9 9/32” x 5 3/4”)

Mass

With speakers 3.57 kg (7.87 lbs)

Withoutspeakers 1.27 kg (2.80 lbs)

n SPEAKERSECTION

MASH (1 bit DAC)

C120V,60Hz

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Typ

Speaker(s) 8 cm (5 1/2”) cone type 6 W

Impedance 6 W

Inputpower 6(M

Dimension (WxHxD) 121 mmx236 mmx146 mm

1Way, 1 speaker system

(4 3/4” x 9 9/32” x 5 3/4”)

Power consumption in standbymode:

Notes:

· Specifications are subject to change without notice.

)

· Mass and dimensions are approximate.

CONTENTS

Page Page

11 Service Positions

1 Safety Precautions

1.1. General Guidelines

1.2. Caution for fuse replacemen t

1.3. Before repair and adjustment

1.4. Protection Circuitry

1.5. Safety Parts Information

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

3 Precaution of laser diode

4 Handling Precautions For Traverse Unit

5 About Lead Free Solder (PbF)

5.1. Service caution based on legal restrictions

6 Accessories

7 Operation Procedures

7.1. Remote Control Key Buttons Operations

7.2. Main Unit Key Buttons Operations

7.3. Connection

8 Self diagnosis and special mode setting

8.1. Service Mode Summary Table

8.2. Service Mode Table 1

8.3. Error Code Table 1

9 Assembling and Disassembling

9.1. Caution

9.2. Disassembly flow chart

9.3. Main Components & P.C.B. Locations

9.4. Disassembly of Rear Cabinet

9.5. Disassembly of Panel P.C.B. & LED P.C.B.

9.6. Disassembly of Main P.C.B., Sensor P.C.B. & Tuner

P.C.B.

9.7. Disassembly of Switch P.C.B. and Traverse Unit

9.8. Disassembly of Power Switch P.C.B. & Tact Switch P.C.B.

9.9. Replacement of Traverse Cover

9.10. Disassembly of CD Servo P.C.B.

9.11. Disassembly of Motor Unit & Motor P.C.B.

9.12. Disassembly of CD Block & CD Lid

9.13. Disassembly of Speakers

10 Service Fixture and Tools

11.1. Check and Repair of CD Servo P.C.B.

11.2. Check and repair of Main P.C.B., Sensor P.C.B., Tuner

P.C.B., Motor 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.

12 Voltage and Waveform Chart

12.1. Main P.C.B.

12.2. CD Servo P.C.B.

12.3. Motor P.C.B.

12.4. Panel P.C.B.

12.5. Tuner P.C.B.

12.6. Waveform Chart

13 Wiring Connection Diagram

14 Block Diagram

14.1. CD Servo

14.2. Tuner

14.3. Main (1/2), Transformer & Sensor

14.4. Main (2/2), Panel, LED, Power Switch, Tact Switch, Switch

& Motor

15 Notes of Schematic Diagrams

16 Schematic Diagram

16.1. (A) CD Servo Circuit

16.2. (B) Tuner Circuit

16.3. (C) Main Circuit

16.4. (D) Panel Circuit, (E) LED Circuit, (F) Power Switch

Circuit, (G) Tact Switch Circuit & (H) Switch Circuit

16.5. (I) Motor Circuit, (J) Sensor Circuit & (K) Transforme r

Circuit

17 Printed Circuit Board

17.1. (A) CD Servo P.C.B. & (B) Tuner P.C.B.

17.2. (C) Main P.C.B.

17.3. (D) Panel P.C.B., (E) LED P.C.B., (F) Power Switch

P.C.B., (G) Tact Switch P.C.B., (H) Switch P.C.B., (I)

Motor P.C.B., (J) Sensor P.C.B. & (K) Transforme r P.C.B.

18 Illustration of ICs, Transistors and Diodes

19 Terminal Function of IC's

2.0 W (appx.)

19.1. IC801 (MN101EF16ZXW) Servo Processor,Digital Signal

Processor/Digital filter and D/A Converter

20 Exploded Views

20.1. Cabinet Parts Location

20.2. Packaging

21 Replaceme nt Parts List

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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 1MW and 5.2MW . 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 1.5kW , 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

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1.2. Caution for fuse replacement

1.3. Before repair and adjustment

Disconnect AC power, discharge Power Capacitors C611 and C616 through a 10W , 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 consum ption at AC 120V, 60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 135mA.

1.4. 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 connec tion 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.

1.5. Safety Parts Information

Safety Parts List:

There are special components used in this equipment which are important for safety. These parts are marked by 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.

Reference No. Part No. Part Name & Description Remarks

A2 K2CB2CB00018 AC CORD [M]

F901 K5D202APA008 FUSE [M] IP601 K5G302AA0002 FUSE PROTECTOR [M] IP602 K5G251A00008 FUSE PROTECTOR [M]

JK901 K2AB2B000007 FUSE [M]

L901 ELF15N035AN LINE FILTER [M]

T901 G4C5ABD00006 TRANSFORMER [M]

in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts

Table 1

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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 comme rcially 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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3 Precaution of laser diode

CAUTION:

This unit utilizes a class 1 laser diode in the optical pickup unit .

Invisible laser radiation is emitted from the optical pickup lens.

Wavelength: 780nm

When the unit is turned on:

1. Do not look directly into the optical pickup lens.

2. Do not use optical instruments to look at the optical pickup lens.

3. Do not adjust the preset variable resistor on the optical pickup lens.

4. Do not disassemble the optical optical pickup unit.

5. If the optical pickup is replaced, use the manufacturer’s specified replacement pickup only.

6. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

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.

n Use of caution label (Except for U.S.A.)

4 Handling Precautions For Traverse Unit

The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by the static electricity of clothes or our human body.

So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).

· Way of handling the 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. To prevent the breakdown of the laser diode, an antistatic shorting pin is inserted into the flexible board (FFC board). (Fig. 1)

3. Take care not to apply excessive stress to the flexible board (FFC board). When removing or connecting the short pin, finish the job in as short time as possible.

4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.

Grounding for electrostatic breakdown prevention

1. Human body grounding. (Fig. 2)

Use the anti-static wrist strap to discharge the static electricity from your body.

2. Work table grounding. (Fig. 2)

Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is place, and ground the sheet.

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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).

Caution when replacing the Traverse Deck

The traverse deck 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.

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5 About Lead Free Solder (PbF)

5.1. Service caution based on legal restrictions

5.1.1. 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%

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6 Accessories

Remote Control

AC Cord

FM/AM Antenna

7 Operation Procedures

7.1. Remote Control Key Buttons Operations

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7.2. Main Unit Key Buttons Operations

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7.3. Connection

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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 mode 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

[ ] [4], [7] To enter into doctor mode for various item

checking.

Mode Remote control unit buttons Application Note

Doctor Mode [DIMMER] FL ALL Segment inspection (Refer to the section 8.2 for more

[7], [8], [9] Forced VOL setting (Refer to the section 8.2 for more

[ ], [1], [1] CD Loading Test (Refer to the section 8.2 for more

[ ], [1], [2] CD Traverse Test (Refer to the section 8.2 for more

[ ], [1], [3] CD Combination Test (Refer to the section 8.2 for more

[ ], [1], [4] CD Auto Adjustment Display (Refer to the section 8.2 for more

[SLEEP] Cold Start setting (Refer to the section 8.2 for more

(Refer to the section 8.2 for more information.)

information.)

8.2. Service Mode Table 1

Below is the various special modes for checking:-

Item FL Display Key Operation

Mode Name Description Front Key

Self-Diagnostic Mode

To enter into self diagnostic checking for main unit.

1. Select [CD] for CD mode (Ensure no CD inserted.)

2. Press and hold [ seconds follow by [FF]

To exit, press [ main unit or remote control.

] button for 2

] button on

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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 ﬁ 2

DIsplay 1

Checksum (Condition 1) When EEPROM IC detected and has ROM correction.

Checksum (Condition 2) When EEPROM IC is detected and there is no ROM correction.

In any mode:

1. Press [

] button on main unit follow by [4] and [7] on remote control.

To exit, press [

] button on

main unit or remote control.

FL Display Test To check the FL segments display (All

segments will light up)

Checksum (Condition 3) When EEPROM IC is detected and has ROM correction but not working properly.

Display 2

The Check Sum of EEPROM and firmware version will be display for 1 sec. * ROM correction ** Firmware version No:

In doctor mode:

1. Press [DIMMER] button on remote control.

To exit, press [

] button on

main unit or remote control.

Item FL Display Key Operation

Mode Name Description Front Key

Volume Setting Mode

To check for the volume setting of the main unit. The volume will be automatically set to its respective level (in dB). During the mode, trebble/bass/EQ will be set to “0” dB & OFF.

In doctor mode:

1. Press [7] button on remote control.

2. Press [8] button on remote control.

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CD Loading Test Mode

CD Traverse Unit Test Mode

CD Combination Test Mode

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.

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 IOS or the traverse is out of focus.

A combination of CD loading & traverse unit test.

The counter will increment by 1 until reach

9999999

ﬂ

The counter will increment by 1 until reach

9999999

ﬂ

The counter will increment by 1 until reach

9999999

ﬂ

3. Press [7] button on remote control. To exit, press [ main unit or remote control.

In doctor mode:

1. Press [ remote control.

To cancel, press [0] button remote control. To exit, press [ main unit or remote control.

In doctor mode:

1. Press [ remote control.

To cancel, press [0] button remote control. To exit, press [ main unit or remote control.

In doctor mode:

1. Press [ remote control.

To cancel, press [0] button remote control. To exit, press [ main unit or remote control.

], [1] & [1] button on

], [1] & [2] button on

], [1] & [3] button on

] button on

CD Auto Adjustment Display

Cold Start To activate cold start upon next AC

To display result of self adjustment for CD. For more information, please refer to Section 8.2.1.

The [NO DISC] display will appear after 3s,

power up.

8.2.1. CD Self-Adjustment (AJST) Result Display

Purpose: To display result of self-adjustment for CD.

In doctor mode:

1. Press [ remote control.

To cancel, press [0] button remote control. To exit, press [ main unit or remote control.

In doctor mode:

1. Press [SLEEP] button on remote control.

To exit, press [

ﬂ

main unit or remote control.

], [1] & [4] button on

] button on

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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: When [

], [1] & [4] are pressed at the doctor mode, the following shall be displayed for 3s. The result shall correspond

to the condition met as shown in the table below:

8.3. Error Code Table 1

8.3.1. Mechanism Error Code Table

Self-Diagnosis Function provides information on any problems occuring for the unit and its respective components by displaying error codes. These 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

F26 Communication

between CD servo LSI and micro-p abnormal.

F76 Abnormality in the

output voltage of stabilized power supply.

CD traverse position initial setting operation failsafe counter (1000ms) waiting for REST SW to turn on. Error no. shall be clear by force or during cold start.

CD function DTMS command, after system setting, if SENSE = “L” cannot be detected. Memory shall contain F26code. After power on, CD function shall continue, error display shall be “NO DISC”. Error no. shall be clear by force or cold start.

In normal operation when “DCDET” is detected “L” (IOIO) for two consecutive times, this error code will be displayed for 2s & after PCONT will be turned to “L” (Low).

For CD unit.(For traverse). Press [

Press [ ] on main unit for next error.

] on main unit for next error.

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9 Assembling and Disassembling

9.1. Caution

“ATTENTION SERVICER”

Some chassis components may 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.

4. Refer to the Parts No. on the page of “Parts Locatio n and Replacement Parts List” (Section 21), if necessary.

Warning :-

This product uses a laser diode. Refer to caution statement Precaution of Laser Diode.

Below is the list of disassembly sections

· Disasse mbly of Rear Cabinet

· Disasse mbly of Panel P.C.B. & LED P.C.B.

· Disasse mbly of Main P.C.B., Sensor P.C.B., Tuner P.C.B.

· Disasse mbly of Switch P.C.B. & Traverse Unit

· Disasse mbly of Power Switch P.C.B. & Tact Switch P.C.B.

· Replacement of Traverse Cover

· Disasse mbly of CD Servo P.C.B.

· Disasse mbly of Motor Unit & Motor P.C.B.

· Disasse mbly of CD Block & CD Lid

· Disasse mbly of Speakers

Below shown is part no. of different screws types used:

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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 as below.

9.2.1. For Main unit

9.2.2. For Speaker unit

9.3. Main Components & P.C.B. Locations

9.3.1. Main Parts Locations

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9.3.2. Speaker Unit Parts Location (For SB-EN33A only)

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9.4. Disassembly of Rear Cabinet

Step 1 Remove 10 screws.

Step 2 Lift up the rear cabinet.

Step 3 Detach cable (FP806) on Main P.C.B. and remove the

rear cabinet as arrow shown.

9.5. Disassembly of Panel P.C.B. & LED P.C.B.

· Follow the (Step 1) - (Step 3) of Item 9.4 - Disassembly of Rear Cabinet

Step 1 Remove 2 screws on the LCD Holder unit.

Step 2 Detach cable (P801) on Main P.C.B..

9.6. Disassembly of Main P.C.B., Sensor P.C.B. & Tuner P.C.B.

· Follow the (Step 1) - (Step 3) of Item 9.4 - Disassembly of Rear Cabinet

Step 1 Remove 5 screws.

Step 2 Detach cables (P352, P351 ,FP701 ,P801 & P802) on Main P.C.B..

Step 3 Lift up the Main P.C.B. Sensor P.C.B. and Tuner P.C.B.

9.7. Disassembly of Switch P.C.B. and Traverse Unit

· Follow the (Step 1) - (Step 3) of Item 9.4 - Disassembly of Rear Cabinet

· Follow the (Step 1) - (Step 3) of Item 9.6 - Disassembly of Main P.C.B., Sensor P.C.B. & Tuner P.C.B.

Step 1 Remove 4 screws.

Step 2 Remove 2 screws on Switch P.C.B..

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9.8. Disassembly of Power Switch P.C.B. & Tact Switch P.C.B.

· Follow the (Step 1) - (Step 3) of Item 9.4 - Disassembly of Rear Cabinet

· Follow the (Step 1) - (Step 2) of Item 9.5 - Disassembly of Panel P.C.B. & LED P.C.B.

Step 1 Detach cable (P802) on Main P.C.B..

Step 2 Remove 3 screws.

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