Panasonic SA-AKX14LM Schematic

PMX1206001CE

CD Stereo System

Model No. SA-AKX14LM-K

Product Color: (K)...Black Type

Please refer to the original service manual for:

 CD Mechanism Unit (BRS1C), Order No. PSG1102001CE  Speaker system SB-AKX14LM-K, Order No. PMX1206002CE

Please refer to the original service manual for:

CD Mechanism Unit (BRS1C), Order No. PSG1102001CE Speaker system SB-AKX14LM-K, Order No. PMX

1206002CE

Nota: El idioma original de este Manual de Servicio es en idioma inglés, sin embargo algunas notas aquí mencionadas serán escritas en español para mejor descripción para Centros de Servicio de México.

3 Service Navigation

1 Safety Precautions

1.1. General Guidelines

1.3. Before Repair and Adjustment

1.4. Protection Circuitry

1.5. Caution For Fuse Replacement

1.6. Safety Parts Information

2 Warning

2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatic Sensitive (ES) Devices

2.2. Precaution of Laser Diode

2.3. Service caution based on Legal restrictions

2.4. Handling Precautions for Traverse Unit

3.1. Service Information

4 Specifications 5 General/Introduction

5.1. Media Information

6 Location of Controls and Components

6.1. Remote Control Key Button Operation

6.2. Main Unit Key Button Operation

7 Installation Instructions

7.1. Speaker and A/C Connection

8 Service Mode

8.1. Cold-Start

8.2. Doctor Mode Table

8.3. Reliability Test Mode (CD Mechanism Unit (BRS1C))

8.4. Self-Diagnostic Mode

8.5. Self-Diagnostic Error Code Table

8.6. Sales Demonstration Lock Function

9 Troubleshooting Guide

9.1. Part Location

9.2. Troubleshooting Guide for F61 and/or F76

9.3. D-Amp IC Operation & Control

10 Service Fixture & Tools 11 Disassembly and Assembly Instructions

11.1. Disassembly Flow Chart

11.2. Main Components and P.C.B. Locations

11.3. Disassembly of Top Cabinet

11.4. Disassembly of Tuner P.C.B.

11.5. Disassembly of Front Panel Unit

11.6. Disassembly of Panel P.C.B.

11.7. Disassembly of Remote Sensor P.C.B.

11.8. Disassembly of USB P.C.B.

11.9. Disassembly of LCD P.C.B.

11.10. Disassembly of CD Lid

11.11. Disassembly of Main P.C.B.

11.12. Replacement of Voltage Regulator Transistor (Q2022)

11.13. Replacement of Audio Digital Amp IC (IC5902)

11.14. Disassembly of SMPS P.C.B.

11.15. Replacement of Switching Regulator IC hh(IC5701)

11.16. Replacement of Rectifier Diode (D5702)

11.17. Replacement of Rectifier Diode (D5801)

11.18. Replacement of Rectifier Diode (D5802)

11.19. Replacement of Regulator Diode (D5803)

11.20. Disassembly of CD Mechanism Unit (BRS1C)

11.21. Disassembly of Rear Panel

18 Printed Circuit Board

18.1. CD Servo P.C.B.

18.2. Main & Tuner P.C.B.

18.3. Panel, LCD, Remote Sensor & USB P.C.B.

18.5. SMPS P.C.B.

19 Appendix Information of Schematic Diagram

19.1. Voltage & Waveform Chart

19.2. Illustration of ICs, Transistor and Diode

19.3. Terminal Function of ICs

20 Exploded View and Replacement Parts List

20.1. Exploded View and Mechanical replacement Part List

20.2. Electrical Replacement Part List

12 Replacement of Traverse Unit

12.1. Disassembly of Traverse Unit

12.2. Assembly of Traverse Unit

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

13 Service Position

13.1. Checking and Repairing of Main P.C.B.

13.2. Checking and Repairing of Panel P.C.B.

13.3. Checking and Repairing of LCD P.C.B.-

13.4. Checking and Repairing of SMPS P.C.B.

13.5. Checking and Repairing of CD Servo P.C.B.-

14 Simplified Block Diagram

14.1. Overall Simplified Block Diagram

14.2. Power Block Diagram

15 Block Diagram

15.1. Servo & System Control

15.2. Audio

15.3. Power Supply

16 Wiring Connection Diagram 17 Schematic Diagram

17.1. Schematic Diagram Notes

17.2. CD Servo Circuit

17.3. Main Circuit

17.4. Panel, LCD, Remote Sensor & USB Circuit

17.5. Tuner

17.6. SMPS Circuit

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 1M and 5.2M . When the exposed metal does not have a return path to the chassis, 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 1.5k , 10 watts resistor, in parallel with a 0.15F 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

1.3. Before Repair and Adjustment

Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5703, C5708) through a 10 , 10 W 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 ~127 V ac /60 Hz in Power ON, FM Tuner, No Signal, volume minimal mode should be ~ 500 mA (PH). Current consumption at 127 V ac, 60 Hz in Power ON, FM Tuner, No Signal, volume minimal mode should be ~ 500 mA.

1.4. Protection Circuitry

The protection circuitry may have operated if either of the following conditions are noticed:

s No sound is heard when the power is turned on. s 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.

1.5. Caution For Fuse Replacement

1.6. Safety Parts 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.

Modelo:

Nombre del componente

CABLE TOMACORRIENTE.

CONECTOR TOMACORRIENTE

TRANSFORMADOR DE PODER

SC-AKX14LM-

TRANSFORMADOR DE

RESPALDO

FUSIBLE PRIMARIO

ZNR

CAPACITOR DE AC

OPTOACOPLADOR

PCB SMPS

BOBINA PRIMARIO

GAB. MET. SIN DOBLAR

BRS1C CD UNIT

REAR PANEL

INSTRUCTIVO

Numero de Parte Seguridad

K2CB2YY00059

K2AB2B000007

G4DYZ0000057

ETS19AB2E6AG

K5D802APA008

ERZV05Z471CS

F1BAF1020020

F0CAF224A105

F0CAF104A105

F1BAF471A013

B3PBA0000579

RJB3568A-1

G0B612H00004

RKMX1011Z-KL

RD-DDL081-PX

RXTM0002E-A

RQTM0187

2 Warning

2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatic Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static 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 electrostatic discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equipped 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 equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup 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 removal 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, aluminum 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 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).

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 PW/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.

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 (86qF) 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±86qF).

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%

2.4. Handling Precautions for Traverse Unit

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 unit.

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 flexible cable, cut off the antistatic FPC.

2.4.2. Grounding for electrostatic breakdown prevention

Some devices such as the DVD 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.

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.

• CD Mechanism Unit (BRS1C):

1) This model uses CD Mechanism Unit (BRS1C).

• Micro-processor:

1) The following components are supplied as an assembled part.

- Micro-processor IC, IC2003 (*MN101EF16KXW) * Este material se encuentra sin programar, necesita ser programado.

• Speaker System:

1) This model uses Speaker System, SB-AKX14LM-K.

4 Specifications

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5 General/Introduction

5.1. Media Information

6 Location of Controls and Components

6.1. Remote Control Key Button Operation

6.2. Main Unit Key Button Operation

7 Installation Instructions

7.1. Speaker and A/C Connection

8 Service Mode

8.1. Cold-Start

Here is the procedure to carry out cold-start or initialize to shipping mode.

1. Unplug AC power cord

2. Press & hold [POWER] button

3. Plug AC power cord while [POWER] button being pressed FL Display will show “_ _ _ _ _ _ _ _”

4. Release [POWER] button

8.2. Doctor Mode Table

8.2.1. Doctor Mode Table 1

Doctor Mode

EEPROM checksum check

Item

DescriptionMode Name

To enter into Doctor Mode In CD Mode:

Displaying of

1. Year Develop.

2. Model Type.

3. ROM Type.

4. Firmware Version.

Version No. (001 ~ 999) specific for each firmware

23 41

FL Display

(Decimal)

Key Operation

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

2. To exit, press [DELETE] button on remote control or, press [POWER, /I] button on Main Unit

In CD mode:

1. Enter Doctor Mode

Front Key

Cold Start To active cold start upon next AC

power up when reset start is execute the next time .

In Doctor Mode :

1. Press [SLEEP] button on remote control.

8.2.2. Doctor Mode Table 2

Volume Setting Check

FL Display Check

BRS1C Reliability Test (Traverse)

Item

DescriptionMode Name

To check the volume setting of a main unit.

To check the FL segment display All segment will light up while all LED blink at 0.5s,intervals.(if any)

To determine CD Mechanism BRS1C Access Inner & Outer disc operation.

In this mode,ensure the CD is in the main unit.

Note: Refer to Section 6.3 Fig 2. for process flow.

FL Display

Press [7]: VOL50 Press [8]: VOL35 Press [9]: VOL0

The counter will increment by one. When reach 9999 will change to 0000

Cancellation Display

Key Operation

Front Key

In Doctor Mode:

1. Press [7], [8], [9] button on remote control.

Volume

In Doctor mode:

1. Press [1] button on remote control.

2. To cancel, press [0] on remote control.

In Doctor Mode:

1. Press [10] [1] [2] button on remote control.

2. To cancel, press [0] on remote control.

BRS1C Reliability Test

(Combination)

BRS1C Reliability Test (Loading)

To determine CD Mechanism Unit (BRS1C) Open/Close & Access Inner & Outer Disc Operation.

In this mode,ensure the CD is in the main unit.

Note: Refer to Section 6.3 Fig 3. for process flow.

To determine CD Mechanism Unit (BRS1C) Open/Close operation.

In this mode, the tray will open & close.

Note: Refer to Section 6.3 Fig 1 for process flow.

In Doctor Mode:

1. Press [10] [1] [5] button on remote control.

The counter will increment by one. When reach 9999 will change to 0000

Cancellation Display

2. To cancel, press [0] on remote control.

In Doctor Mode:

1. Press [10] [2] [1] button on remote control.

The counter will increment by one. When reach 9999 will change to 0000

Cancellation Display

2. To cancel, press [0] on remote control.

8.2.3. Doctor Mode Table 3

Self- Adjustment

(AJST)

Result Display

CD LSI

Version Check

Item

DescriptionMode Name

i. Function: To display result of self-adjustment for CD .

This is used for servicing

and analysis.

For checking CD LSI Version and checksum information.

FL Display

Display of auto adjustment result

Reference table:

ERROR Code Status Condition

012468 ACEF

AOC1/AOC2 O O OOOOOO -

ABC2/ABC1 O - XOXOXO X -

AOC1 O - O X X O O X X -

FAGC/T AGC O - O O O XXXX -

AGC2 O - OOOOOO O

O: OK ; X: NG (In case that time out happens.) : Either one of FO AOC, TR AOC and FO coarse AGC is NG . : If the AGC is NG (ignore others).

Key Operation

Front Key

In Doctor Mode:

1. Press [10] [1] [4] button on remote control .

2.To cancel, press [0] on remote control .

In Doctor Mode :

1. Press [4] button on remote control .

Version (Decimal) Checksum (Hex)

(Display 1)

ROM Version

(Display 2)

Year

Year Develop

Develop

ROM Type

Version (Decimal)

2.To cancel, press [0] on remote control .

after 2 sec

8.3. Reliability Test Mode (CD Mechanism Unit (BRS1C))

Below is the process flow chart of the aging test for the CD Mechanism Unit (BRS1C).

OPEN Operation

OPEN wait for 1 s

CLOSE Operation

CLOSE wait for 4 s

Fig. 1. Reliability Test (Loading)

Count up

First Track

Access

First Track

Play 10 s

First Track

Access

First Track

Play 5 s

Last Track

Access

Last Track

Play 5 s

Fig. 2. Reliability Test (Traverse)

Count up

Last Track

Access

Last Track

Play 10 s

Open

Operation

Open wait

for 1 s

Operation

Fig. 3. Reliability Test (Combination)

Count up

8.4. Self-Diagnostic Mode

Mode Name

Self Diagnostic Mode

Error code information

Delete error code

Item

Description

To enter into self diagnostic checking

System will perform a check on any unusual/error code from the memory

To clear the stored in memory (EEPROM IC)

Example:

FL Display

Step 1: Select CD mode (Ensure no disc is inserted).

Step 2: Press & hold [ ] follow by [ seconds.

Step 1: In self diagnostic mode, Press [ ] on main unit.

To exit, press [^/I] on main unit or remote control.

Step 1: In self diagnostic mode, Press [0] on remote control.

To exit, press [^/I] on main unit or remote control.

Key Operation

Front Key

] on main unit for 2

8.5. Self-Diagnostic Error Code Table

Self-Diagnostic Function (Refer Section 6.4. Self-Diagnostic Mode) provides information on any problems occurring for the unit and its respective components by displaying the 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.

8.5.1. Power Supply Error Code Table

8.5.2. CD Mechanism Error Code Table (CD Mechanism Unit (BRS1C))

Error Code Diagnostic Contents Description of 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.

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 [ next error.

] on main unit for

F26 Communication between

CD servo LSI and micro-p abnormal.

During switch to CD function, if SENSE = “L” within failsafe time of 20ms.

8.6. Sales Demonstration Lock Function

8.6.1. Entering into sales Demo Mode

Here is the procedures to enter into Sales Demonstration Lock. Step 1: Turn on the unit. Step 2: Select to any mode function. Step 3: Press [ Step 4: The display will show upon entering into this mode for 2 sec..

Note: [

8.6.2. Cancellation

Step 1: Turn on the unit. Step 2: Select to any mode function. Step 3: Press [ Step 4: The display will show upon entering into this mode for 2 sec..

OPEN/CLOSE] key then [ / ] key at the same time,press and hold both [ OPEN/CLOSE] and [ / ] keys for 5 sec.

OPEN/CLOSE] button is invalid and the main unit displays “LOCKED” while the lock function mode is entered.

OPEN/CLOSE] key then [ / ] key at the same time,press and hold both [ OPEN/CLOSE] and [ / ] keys for 5 sec.

Press [ next error.

] on main unit for

9 Troubleshooting Guide

9.1. Part Location

9.1.1. SMPS P.C.B.

SMPS Control IC: IC5799

Switching Regulator IC: IC5701

Thermistor: TH5860

AC Inlet: P5701

Fuse: F1

Photocoupler: PC5702, PC5799

Photocoupler: PC5720

Fig. 1 SMPS P.C.B.

Rectifier Diode D5801, D5802

Main Transformer: T5701

Connector: CN5802

9.1.2. Main P.C.B.

Resistor Defective

R5905

Audio Digital

IC5902

Regulator Circuit

D2017

Regulator Circuit

Q2000

Resistor Defective R5936

Amp IC

Resistor Defective

R5926

Regulator Circuit Q2022

Switching Voltage Regulator

IC2011

Resistor Defective

R5928

Voltage Regulator Circuit D2004

Cable Wire CN2000

Voltage Regulator Circuit

IC2021

Voltage Regulator IC2009

Fig. 2 Main P.C.B.

9.2. Troubleshooting Guide for F61 and/or F76

This section illustrates the checking procedures when upon detecting the error of “F61” and/or “F76” after power up of the unit. It is for purpose of troubleshooting and checking in SMPS & Main P.C.B.

Symptom Remarks

Set cannot ON 1 AC Cord 1 AC Cord Faulty, Loose connection.

Set can ON then F6 1

Set can ON then F7 6

Set can ON working normally for some time then F7 6

AC Inlet, P5701 P5701 solder crack, dry joint. 3 F use, F1 3 Fuse, F1 Open. 4 P hotocoupler 4 PC5702/PC5799 solder crack.

PC5702, PC5799 Dry joint, short circuit, open circuit. 5 S witching Regulator 5 IC5701 Faulty.

IC, IC5701 6 V oltage Regulator

Transistor (Q2022) 1 S peaker Output 1 Faulty speaker unit, Loose connection, Short.

2 D -AMP circuit D-AMP IC, IC5902 defective.

1 Main Transformer T5701 Short circuit between Pin 14 and Pin 15.

2 DC-DC Circuit 2a

3 P hotocoupler

PC5720

1 R ecti•er Diode D580 Improper contact between D5801 to Heatsink.

Recti•er Diode D5802 Improper contact between D5802 to Heatsink. 2 T hermistor TH5860 1b Set trigger temperature protection.

6 Q2022 Faulty.

(Check DC voltage at speaker terminals, 3V and above defective)

DC Voltage ok but no sound, check DC Voltage at Pin 1. 5V ok condition, 2.5V or 0V defective.

2a, 2b ok but no sound, check PWM waveform at Pin 10 and Pin 14 . If no PWM, 4 resistors defective (R5905, R5926, R5936, R5928).

1b Short circuit between Pin 15 and Pin 16. 1c Short circuit between Pin 16 and Pin 17.

Check cable wire connection between cable wire CN2000. (At Main P.C.B) & connector CN5802 (At SMPS P.C.B) (i) +5V Switching Voltage Regulator (IC2011).

(ii) +3.3V Voltage Regulator (IC2009). (iii) +9V Voltage Regulator Circuit (Q2021, D2004). (iv) CD +7.5V Regulator Circuit (Q2000, Q2022, D2017).

PC5720 solder crack, Dry joint, short circuit, open circuit.

Possible Fault(s)Checking Items

Refer to Section 9.1.1 Fig. 1. SMPS P.C.B.

Refer to Section 9.1.2 Fig. 2. Main P.C.B.

Refer to Section 9.1.1 Fig. 1. SMPS P.C.B.

Refer to Section 9.1.2 Fig. 2. Main P.C.B.

Refer to Section 9.1.1 Fig. 1. SMPS P.C.B.

Refer to Section

9.2.1 Fig. 1. SMPS P.C.B.

.3. D-Amp IC Operation & Control

1170 ~ 1250 H 350 1260 ~ 1450 L 301 1460 ~ 1540 H 350 1550 ~ 1710 L 301

Table 4: F_HOP Control during 10 kHz Step

Note: During activating, the 3 control pins namely MUTE_F, MUTE_A and MODE_DA must be used to cover the “Pop” sound cause by F-HOP switching.

10 Service Fixture & Tools

Prepare service tools before process service position.

Ref. No Service Tools Remarks

SFT1 Main P.C.B. (CN2000) - SMPS P.C.B. (CN5802) REX1534(15P Cable Wire)

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