Philips BDP-7520-F-7 Service Manual

SERVICE MANUAL

BLU-RAY DISC PLAYER

BDP7520/F7

IMPORTANT SAFETY NOTICE

Proper service and repair is important to the safe, reliable operation of all P&F Equipment. The service procedures recommended by P&F and described in this service manual are effective methods of performing service operations. Some of these service special tools should be used when and as recommended.

It is important to note that this service manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. P&F could not possibly know, evaluate and advice the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, P&F has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by P&F must first use all precautions thoroughly so that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.

TABLE OF CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1-1

Laser Beam Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2-1

Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-1

Standard Notes for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4-1

Cabinet Disassembly Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5-1

How to Initialize the BLU-RAY Disc Player . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6-1

Firmware Renewal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1

Home Network (DLNA) Error Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1

Schematic Diagrams / CBA and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1

Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12-1

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1

System Control Timing Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1

IC Pin Function Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15-1

Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16-1

Exploded Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17-1

Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-18-1

Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19-1

Manufactured under license from Dolby Laboratories. Dolby and the double-D symbol are trademarks of Dolby Laboratories.

SPECIFICATIONS

1-1-1 E5VK6SP

LASER BEAM SAFETY PRECAUTIONS

This BD player uses a pickup that emits a laser beam.

Do not look directly at the laser beam coming from the pickup or allow it to strike against your skin.

The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 30 cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam.

CAUTION: Use of controls and adjustments, or doing procedures other than those specified herein, may result in hazardous radiation exposure.

Drive Mechanism Assembly

Laser Beam Radiation

Laser Pickup

Turntable

Location: Inside Top of BD mechanism.

1-2-1 B2NLBSP

IMPORTANT SAFETY PRECAUTIONS

Product Safety Notice

Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection, nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by a # on schematics and in parts lists. Use of a substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire, and/or other hazards. The Product’s Safety is under review continuously and new instructions are issued whenever appropriate. Prior to shipment from the factory, our products are carefully inspected to confirm with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

Precautions during Servicing

A. Parts identified by the # symbol are critical for

safety. Replace only with part number specified.

B. In addition to safety, other parts and assemblies

are specified for conformance with regulations applying to spurious radiation. These must also be replaced only with specified replacements. Examples: RF converters, RF cables, noise blocking capacitors, and noise blocking filters, etc.

C. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

D. Use specified insulating materials for hazardous

live parts. Note especially:

1) Insulation tape

2) PVC tubing

3) Spacers

4) Insulators for transistors

E. When replacing AC primary side components

(transformers, power cord, etc.), wrap ends of wires securely about the terminals before soldering.

F. Observe that the wires do not contact heat

producing parts (heat sinks, oxide metal film resistors, fusible resistors, etc.).

G. Check that replaced wires do not contact sharp

edges or pointed parts.

H. When a power cord has been replaced, check that

5 - 6 kg of force in any direction will not loosen it.

I. Also check areas surrounding repaired locations. J. Be careful that foreign objects (screws, solder

droplets, etc.) do not remain inside the set.

K. When connecting or disconnecting the internal

connectors, first, disconnect the AC plug from the AC outlet.

L. When reassembling, be sure to use the original

screws or specified screws listed in the parts list.

1-3-1 BDN_ISP

Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts, and wires have been returned to their original positions. Afterwards, do the following tests and confirm the specified values to verify compliance with safety standards.

1. Clearance Distance

When replacing primary circuit components, confirm specified clearance distance (d) and (d’) between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)

Table 1: Ratings for selected area

Chassis or Secondary Conductor

Primary Circuit

AC Line Voltage Clearance Distance (d), (d’)

120 V

Note: This table is unofficial and for reference only. Be

sure to confirm the precise values.

≥ 3mm(d)

≥ 4mm(d’)

2. Leakage Current Test

Confirm the specified (or lower) leakage current between B (earth ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is lower than or equal to the specified value in the table below.

Measuring Method (Power ON):

Insert load Z between B (earth ground, power cord plug prongs) and exposed accessible parts. Use an AC voltmeter to measure across the terminals of load Z. See Fig. 2 and the following table.

d' d

Exposed Accessible Part

One side of

Power Cord Plug Prongs

Fig. 1

AC Voltmeter (High Impedance)

Table 2: Leakage current ratings for selected areas

AC Line Voltage Load Z Leakage Current (i)

2kΩ RES.

Connected in

parallel

120 V

50kΩ RES.

Connected in

parallel

Note:This table is unofficial and for reference only. Be sure to confirm the precise values.

i≤0.7mA AC Peak

i≤2mA DC

i≤0.7mA AC Peak

i≤2mA DC

1-3-2 BDN_ISP

One side of power cord plug

prongs (B) to:

RF or

Antenna terminals

A/V Input, Output

Fig. 2

STANDARD NOTES FOR SERVICING

Circuit Board Indications

1. The output pin of the 3 pin Regulator ICs is indicated as shown.

To p Vi ew

Out

2. For other ICs, pin 1 and every fifth pin are indicated as shown.

Pin 1

3. The 1st pin of every male connector is indicated as shown.

Pin 1

Input

Bottom View

Pb (Lead) Free Solder

When soldering, be sure to use the Pb free solder.

How to Remove / Install Flat Pack-IC

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:

1. Prepare the hot-air flat pack-IC desoldering machine, then apply hot air to the Flat Pack-IC (about 5 to 6 seconds). (Fig. S-1-1)

Fig. S-1-1

Instructions for Connectors

1. When you connect or disconnect the FFC (Flexible Foil Connector) cable, be sure to first disconnect the AC cord.

2. FFC (Flexible Foil Connector) cable should be inserted parallel into the connector, not at an angle.

FFC Cable

Connector

CBA

* Be careful to avoid a short circuit.

2. Remove the flat pack-IC with tweezers while applying the hot air.

3. Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

4. Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6)

CAUTION:

1. The Flat Pack-IC shape may differ by models. Use an appropriate hot-air flat pack-IC desoldering machine, whose shape matches that of the Flat Pack-IC.

2. Do not supply hot air to the chip parts around the flat pack-IC for over 6 seconds because damage to the chip parts may occur. Put masking tape around the flat pack-IC to protect other parts from damage. (Fig. S-1-2)

1-4-1 BDN_SN

3. The flat pack-IC on the CBA is affixed with glue, so be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it.

With Soldering Iron:

1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

CBA

Masking Ta pe

Tweezers

Hot-air Flat Pack-IC Desoldering Machine

Flat Pack-IC

Fig. S-1-2

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig. S-1-3

2. Lift each lead of the flat pack-IC upward one by one, using a sharp pin or wire to which solder will not adhere (iron wire). When heating the pins, use a fine tip soldering iron or a hot air desoldering machine. (Fig. S-1-4)

Sharp Pin

Fine Tip Soldering Iron

4. Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6)

Fig. S-1-4

1-4-2 BDN_SN

With Iron Wire:

1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

2. Affix the wire to a workbench or solid mounting point, as shown in Fig. S-1-5.

3. While heating the pins using a fine tip soldering iron or hot air blower, pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as shown in Fig. S-1-5.

4. Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

5. Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6)

Note: When using a soldering iron, care must be

taken to ensure that the flat pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gently because it may be damaged if force is applied.

Hot Air Blower

2. Installation

1. Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA so you can install a replacement flat pack-IC more easily.

2. The “ I ” mark on the flat pack-IC indicates pin 1. (See Fig. S-1-7.) Be sure this mark matches the pin 1 on the PCB when positioning for installation. Then presolder the four corners of the flat pack-IC. (See Fig. S-1-8.)

3. Solder all pins of the flat pack-IC. Be sure that none of the pins have solder bridges.

Example :

Pin 1 of the Flat Pack-IC is indicated by a " " mark.

Fig. S-1-7

To Solid Mounting Point

CBA

Tweezers

Iron Wire

Soldering Iron

Fig. S-1-5

Fine Tip Soldering Iron

Flat Pack-IC

Presolder

Flat Pack-IC

CBA

Fig. S-1-8

Fig. S-1-6

1-4-3 BDN_SN

Instructions for Handling Semiconductors

Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work.

1. Ground for Human Body

Be sure to wear a grounding band (1 MΩ) that is properly grounded to remove any static electricity that may be charged on the body.

2. Ground for Workbench

Be sure to place a conductive sheet or copper plate with proper grounding (1 MΩ) on the workbench or other surface, where the semi-conductors are to be placed. Because the static electricity charge on clothing will not escape through the body grounding band, be careful to avoid contacting semi-conductors with your clothing.

1MΩ

CBA

Grounding Band

1MΩ

CBA

Conductive Sheet or Copper Plate

1-4-4 BDN_SN

CABINET DISASSEMBLY INSTRUCTIONS

1. Disassembly Flowchart

This flowchart indicates the disassembly steps to gain access to item(s) to be serviced. When reassembling, follow the steps in reverse order. Bend, route, and dress the cables as they were originally.

[1] Top Cover

[2] Front Unit

[7] Rear Panel

[8] BD Main CBA & BD Mechanism Assembly

[9] Power Supply CBA

[3] SD CBA

[4] Front-A CBA

[5] Front-B CBA

[6] Front Assembly

[10] Main PCB Holder

[11] Heat Sink

2. Disassembly Method

ID/

Loc.

No.

[1] Top Cover D1 6(S-1) ---

[2] Front Unit D2

[3] SD CBA D2 2(S-2), *CN6401 ---

[4]

[5]

[6]

[7] Rear Panel D4 (S-3), 3(S-4), (S-5) 2

[8]

[9]

[10]

[11] Heat Sink D6 (S-11) ---

↓

(1)

Part

Front-A CBA

Front-B CBA

Front Assembly

BD Main CBA & BD Mechanism Assembly

Power Supply CBA

Main PCB Holder

↓

(2)

Fig.

No.

*6(L-1), *2(L-2), *CN1002, *CN6802

D3 *3(L-3) 1

D3 *4(L-4) 1

D3 ---------- ---

4(S-6), 2(S-7), (S-8),

*CN6101, Wireless LAN Adaptor

D6 3(S-9), Power Cover ---

D6 (S-10) ---

↓

(3)

Removal

Remove/*Unhook/

Unlock/Release/

Unplug/Desolder

↓

(4)

Note

↓

(5)

Note:

(1) Identification (location) No. of parts in the figures (2) Name of the part (3) Figure Number for reference (4) Identification of parts to be removed, unhooked,

unlocked, released, unplugged, unclamped, or desoldered. P = Spring, L = Locking Tab, S = Screw, CN = Connector * = Unhook, Unlock, Release, Unplug, or Desolder e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two Locking Tabs (L-2)

(5) Refer to “Reference Notes.”

Reference Notes

1. CAUTION 1: Locking Tabs (L-1), (L-2), (L-3) and

(L-4) are fragile. Be careful not to break them.

2. When reassembling, be sure to use the original screws or specified screws listed in the parts list.

3. The BD Main CBA & BD Mechanism Assembly is adjusted as a unit at factory. Therefore, do not disassemble it. Replace the BD Main CBA & BD Mechanism Assembly as a unit.

(S-1)

[1] Top Cover

(S-1)

Fig. D1

1-5-1 E5VK6DC

[3] SD CBA

(S-2)

[7] *Rear Panel

(L-1)

CN1002

(L-2)

[5] Front-B CBA

(L-1)

CN6802

[2] Front Unit

CN6401

(L-1)

Fig. D2

*See Reference Note 2.

(S-6)

(S-5)

(S-4)

Fig. D4

[8] *BD Main CBA & BD Mechanism Assembly

Wireless LAN Adaptor

(S-3)

(L-4)

[6] Front Assembly

(L-3)

[4] Front-A CBA

Fig. D3

(S-8)

* See Reference Note 3.

(S-7)

CN6101

Fig. D5

1-5-2 E5VK6DC

Power Cover

(S-9)

[9] Power Supply CBA

(S-9)

[10] Main PCB Holder

(S-10)

(S-11)

[11] Heat Sink

Fig. D6

1-5-3 E5VK6DC

3. How to Eject a Disc

When a disc cannot be removed due to malfunction or when an unplayable disc is inserted, follow the procedure below to remove the disc.

Procedure A

1. Unplug the AC power cord and then plug it in.

2. Turn the power on by pressing the [ A] button and the disc tray will open automatically.

Procedure B

1. Remove the Top Cover and Front Unit.

2. Slide the portion A in the direction of the arrow.

3. Pull the tray out manually and remove the disc.

Portion A

1-5-4 E5VK6DC

HOW TO INITIALIZE THE BLU-RAY DISC PLAYER

To put the program back at the factory-default, initialize the BD player as the following procedure.

Note: By initializing, network is reset to disconnected

state and “Network Service Disclaimer” appears on the screen.

1. Turn the power on.

2. Remove the disc on the tray and close the tray.

3. Press [1], [2], [3], [4], and [INFO] buttons on the remote control unit in that order. Fig. a appears on the screen.

" differ depending on the models.

*******

Version Info

F/W Name Version Region Pickup ESN DRM

: ******* : *.*** : *-* : ** : *********************************** : OK

EXIT <POWER>EEPROM CLEAR <STOP>

Fig. a

4. Press [ C ] button on the remote control unit. Fig. b appears on the screen and Fig. c appears on the VFD.

" differ depending on the models.

*******

Version Info

F/W Name Version Region Pickup ESN DRM

EEPROM CLEAR : OK

: ******* : *.*** : *-* : ** : *********************************** : OK

EXIT <POWER>EEPROM CLEAR <STOP>

Fig. b

Fig. c

5. To exit this mode, press [ ] button.

1-6-1 E5SK0INT

FIRMWARE RENEWAL MODE

Note: The file extension of the available firmware is

“b39”.

1. Turn the power on and remove the disc on the tray and close the tray.

2. To put the BD player into version up mode, press [9], [8], [7], [6], and [DISC MENU/POP-UP MENU] buttons on the remote control unit in that order. The tray will open automatically. Fig. a appears on the screen and Fig. b appears on the VFD.

" differ depending on the models.

*******

F/W VERSION UP MODE FW Name:******* Ver *.***

Please Insert a Disc For F/W Version Up.

Fig. a Version Up Mode Screen

The appearance shown in (*1) of Fig. c is described as follows:

No. Appearance State

1 Now Loading... Loading the disc

2 Reading...

Sending files into the memory.

Writing new version data,

3 See FL Display.

the progress will be displayed as shown in Fig. f.

" differ depending on the models.

*******

F/W VERSION UP MODE FW Name:******* Ver *.***

1. ALL Version : *.*** **************.b39 CHECKSUM : ****

See FL Display.

EXIT : POWER

Fig. e Version Up Mode

Fig. b VFD in Version Up Mode

3. Load the disc for version up.

4. The BD player enters the F/W version up mode automatically. Fig. c appears on the screen and Fig. d appears on the VFD. Make sure to insert the proper F/W for the state of this model.

" differ depending on the models.

*******

F/W VERSION UP MODE FW Name:******* Ver *.***

(*1)

Now Loading...

Fig. c Programming Mode Screen (Example)

Fig. d VFD in Programming Mode (Example)

Fig. f VFD in Version Up Mode

5. After programming is finished, the checksum on the VFD (Fig. g).

Fig. g

VFD upon Finishing the Programming Mode (Example)

Checksum appears on the VFD then the tray will open automatically. Remove the disc on the tray.

At this time, no button is available.

6. Unplug the AC cord from the AC outlet. Then plug it again.

7. Turn the power on.

Note: All the settings will be put back to factory-

default.

1-7-1 E5VK6FW

How to Verify the Firmware Version

1. Turn the power on.

2. Remove the disc on the tray and close the tray.

3. Press [1], [2], [3], [4], and [INFO] buttons on the remote control unit in that order. Fig. h appears on the screen.

" differ depending on the models.

*******

Version Info

F/W Name Version Region Pickup ESN DRM

4. To exit this mode, press [ ] button.

: ******* : *.*** : *-* : ** : *********************************** : OK

EXIT <POWER>EEPROM CLEAR <STOP>

Fig. h

1-7-2 E5VK6FW

FIRMWARE RENEWAL MODE (for User)

1. Press [ ] button to display Setup menu.

2. Select Settings - Others - Software Upgrade Disc Upgrade.

3. The screen appears in Fig. a when “Yes” is chosen and the tray opens. Insert the disc and press [ A ] button.

Software Upgrade

Please insert a disc for software Upgrade.

If you want to exit Upgrade, press 'BACK'.

Fig. a

4. Disc loading starts. Fig. b will appear on the screen and Fig. c appears on the VFD.

Software Upgrade

Loading Disc....

6. Firmware loading starts. Fig. f will appear on the screen and Fig. g appears on the VFD.

Software Upgrade

1.Loading 2.Upgrading

Loading Software...

If you want to exit the download, press 'BACK'.

Fig. f

Fig. g VFD in Update Mode

7. Updating starts automatically. Fig. h will appear on the screen and update progress will be displayed as shown in Fig. i on the VFD.

Software Upgrade

1.Loading 2.Upgrading

Upgrading Software...

Fig. b

Fig. c VFD in Update Mode

5. Fig. d will appear on the screen, then select “Yes”. Fig. e will appears on the VFD.

Software Upgrade

Current Version : X.XXX

: X.XXXInsert Version

Select 'Yes' and press 'OK' button to start upgrading.

Press 'No' to exit software upgrade .

NoYes

Fig. d

Please wait for a few minutes.

Do not unplug the AC cord or interrupt upgrading process.

When upgrade is completed unit will automatically turn Off.

Upgrade disc will eject after unit automatically turns back on.

Fig. h

Fig. i VFD in Update Mode

8. “GOODBYE” on the VFD and power turns off automatically when it finishes.

9. The power turns on and the tray will open automatically. Remove the disc on the tray.

Note: The setup setting configured before the update

will be kept.

Fig. e VFD in Update Mode

1-7-3 E5VK6FW

FLOW CHART NO.1

The power cannot be turned on.

TROUBLESHOOTING

Is the fuse normal?

Ye s Is normal state restored when once unplugged power cord is plugged again after several seconds?

Ye s Is 5V voltage outputted to the cathode of D1013?

Ye s

Check each rectifying circuit of the secondary circuit and service it if defective.

FLOW CHART NO.2

The fuse blows out.

Check the presence that the primary component is leaking or shorted and service it if defective.

After servicing, replace the fuse.

FLOW CHART NO.3

When the output voltage fluctuates.

Does the photo coupler circuit on the secondary side operate normally?

Ye s

Check IC1001, IC1003, D1006 and their periphery, and service it if defective.

See FLOW CHART No.2 <The fuse blows out.>

Check if there is any leak or short-circuiting on the primary circuit component, and service it if defective. (IC1001,Q1001, Q1002, T1001, D1001, D1002, D1003, D1004, D1007, C1010, R1013)

Check the presence that the rectifying diode or circuit is shorted in each rectifying circuit of secondary side, and service it if defective.

Check IC1003, IC1011 and their periphery, and service it if defective.

FLOW CHART NO.4

When buzz sound can be heard in the vicinity of power circuit.

Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side, and service it if defective. (D1010, D1013, D1014, D1018, D1023, IC1012)

FLOW CHART NO.5

-FL is not outputted.

Is -23V voltage supplied to the anode of D1018?

Ye s Check for load circuit short-circuiting or leak, and service it if defective.

FLOW CHART NO.6

EV+5V is not outputted.

Is 5V voltage outputted to the cathode of D1013?

Ye s Check for load circuit short-circuiting or leak, and service it if defective.

Check D1009, D1018, C1021 and periphery circuit, and service it if defective.

Check D1013, D1014, C1019, C1025 and thier periphery circuit, and service it if defective.

1-8-1 E5VK6TR

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