AOC PB20C Schematic

VII

LCD TV PB20C

THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

1. SPECIFICATIONS ….............................................................................…………...………….

1-1 GENERAL SPECIFICATIONS ..…................................................…………....…………………….

1-2 LCD TV DESCRIPTION .....................................................…………...……………………………..

1-3 INTERFACE CONNECTOR ......................................................………….....………………………

2. PRECAUTION AND NOTICES .................................................……………..……….…………

2-1 ASSEMBLY PRECAUTION ..........................................................…………..………………………

2-2 OPERATIONG PRECAUTION .....................................................…………..………………………

2-3 STORAGE PRECAUTION …........................................................…………..………………………

2-4 HIGH VOLTAGE WARNING .......................................................…………...………………………

3. D-SUB PIN DISTRIBUTION.........................................................................…………….…….

FACTORY PRESET DISPLAY MODES……………………………………..….………………………

4. ADJUSTMENT.........................................................................……………...………………….

4-1 ADJUSTMENT FUNCTION.............................................................…………..…………………….

4-2 ADJUSTMENTS METHOD .............................................................…………..…………………….

4-3 FRONT PANEL CONTROL KNOBS ................................................…………..……………………

5. TROUBLE SHOOTING CHART................................................................…………...…………

5-1 PANEL CONTROL CIRCUIT TROUBLE SHOOTING………………………………………………..

5-2 MAIN BOARD POWER VCC TROUBLE SHOOTING………………………………………………..

5-3 REMOTE CONTROL BLOCK TROUBLE SHOOTING.………………………………………………

5-4 KEY BOARD CONTROL BLOCK TROUBLE SHOOTING…………………………………………..

5-5 PC CONTROL BLOCK TROUBLE SHOOTING……………………………………………………….

5-6 AUDIO CONTROL BLOCK TROUBLE SHOOTING...............................…………………………...

5-7 VIDEO CONTROL ……………………………………………………………………………………….

6. WHITE-BALANCE, LUMINANCE ADJUSTMENT……………………………………….…………

7. SOFTWARE FLOW CHART……………………………………………………………….………….

8. BLOCK DIAGRAM ........................................................…………………………………………..

8-1 MAIN BOARD BLOCK DIAGRAM . ………………………………………………………………….

8-2 POWER BOARD BLOCK DIAGRAM……………………………………………..…………………...

9. SCHEMATIC DIAGRAM ….......................................................................……………………...

9-1 MAIN BOARD SCHEMATIC DIAGRAM……………………………………………………………….

9-2 POWER BOARD SCHEMATIC DIAGRAM……………………………………………………………

9-3 KEY BOARD SCHEMATIC DIAGRAM………………………………………………………………...

9-4 HEADPHONE JACK BOARD SCHEMATIC DIAGRAM……………………………………………..

9-5 IR BOARD SCHEMATIC DIAGRAM…………………………………………………………………...

10. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY………………………………………….

11. BOM LIST………………………………………………………………………………………………

12. PCB LAYOUT…………………………………………………………………………………………

12-1 MAIN BOARD PCB LAYOUT .…..............……………………………………………………………

12-2 PWPC BOARD PCB LAYOUT ..............…………………………………………………………

12-4 HEADPHONE BOARD PCB LAYOUT ..............……………………………………………………

12-5 IR BOARD AND IR BOARD PCB LAYOUT ..............…..……………………………………………

12-6 KEY BOARD PCB LAYOUT …………………………………………………………………………

TABLE OF CONTENTS

PAGE

1. SPECIFICATIONS FOR LCD TV

Feature

20.1” screen SVGA ( 800 x 600 ) Resolution High Brightness ( 500 cd/m2 ) High Contrast Ration ( 500:1 ) Wide Viewing Angle ( 160 H / 160 V ) Built-in Full channel Tuner with Nicam, Teltext. Graphic (VGA) PIP(Video on Graphic)

Items

Specification

LCD Panel

Screen Size

20.1” TFT-LCD Panel (AU)

Aspect Ratio

4:3

Resolution

800 × 600 (SVGA)

Display Area (opening) H x V

408mm × 306mm

Pixel Pitch

0.51mm × 0.51mm

Display colors

16.7 million

Contrast Ratio

500:1

Brightness

500cd /m2

Viewing Angle

160°(Horizontal) / 160°(Vertical)

Response Time

16ms

Lamp Type/Life

60000 hr

Color Temperature

Cold/Warm

TV Function

TV Tuning System

PAL B/G, D/K, I and SECAM L/L’ (Multi-Europe) Full Channel with Electronic PLL Tuner

Sound System

Nicam / A2

Teltext

Yes

Color systems

PAL / SECAM / NTSC

Graphic (VGA)

Signal Input

Analog: D-Sub 15 pin (detachable cable)

PnP compatibility

DDC / 2B

Input frequency

Analog: FH: 31.5KHz to 48KHz FV: 56Hz to 75Hz

Recommended

Analog: 800 x 600 (60Hz)

Input Audio

Headphone Mini-jack for stereo (3.5ø)

Audio Output

Audio Output: L / R Speaker (built-in): Two 2 watt speakers

Headphone Mini-jack for stereo (3.5ø)

Line Output (RCA L/R)

Other Function

PIP, Wireless Headphone (Option), DPF -Digital Photo Frame (Option)

OSD language

English/Italian/Spaish/German/French/ Portuguese

Table Stand

Included

Wall Mount

VESA 100 x 100 mm

Power

Power Supply

AC100V~240V, 50/60Hz

Power Consumption

<70W

Panel Tilt

Forwards/Backwards/ Rotation

-5°/ +20°/ ± 30°

Dimension

W x H x D (with stand)

696 x 443 x 250 (mm)

Weight (net)

Kg (w/o Accessories)

9KG

Accessories

Remote Controller, Batteries (x2), AC Power Cord, User Manual

Video/Audio Inputs

SCART

RGB or CVBS ×1

Audio L/R ×1

RCA

CVBS (Composite) ×1

Audio L/R ×1

S-Video

S-Video ×1

Share with CVBS (RCA)

1-1 GENERAL SPECIFICATIONS

1-2 LCD TV DESCRIPTION

The LCD TV will contain a main board (include audio), a switching power board (include an inverter board), an IR board, a function keyboard, and an Ear phone board. The main board and power board will house the flat panel to control logic I2C bus, DDC, brightness control logic for LCD panel, DC-DC conversion to supply the appropriate power to the whole board and transmitting TTL level signals into LCD Module to drive the LCD display circuit. The inverter board will drive the six CCFLs (Cold Cathode Fluorescent Tube). The switching power board will provides the power ON/OFF to control the TV and control LED indicator for DPMS. The function keyboard and Remote Control will provide the OSD control signal to the Main Board.

1-3 INTERFACE CONNECTOR

(A) Power Cord Connector.

(B) RF Signal Connector. (C) Video (SCART, AV2, S-VIDEO) / Audio Signal Connectors.

(D) PC D-sub 15 pin Connector. (E) PC Audio Connector.

2. PRECAUTIONS AND NOTICES

2-1 ASSEMBLY PRECAUTION

(1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface by

touching with bare hands (Polarize film, surface of LCD panel is easy to be flawed)

In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display characteristic

and reliability. If this panel is subject to hard pressing, the following occurs : (a) Uniform color (b) Orientation of liquid crystal becomes disorder (2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of it being soiled. (3) Please wipe out drops of adhesive like saliva and water in LCD panel surface immediately.

They might damage to cause panel surface variation and color change. (4) Do not apply any strong mechanical shock to the LCD panel.

2-2 OPERATING PRECAUTION

(1) Please be sure to unplug the power cord before remove the back-cover. (be sure the power is turn-off) (2) Please do not change variable resistance settings in MAIN-BOARD; they are adjusted to the most suitable

value. If they are changed, it might happen LUMINANCE does not satisfy the white balance spec. (3) Please consider that LCD backlight takes longer time to become stable of radiation characteristic in low

temperature than in room temperature. (4) Please pay attention to displaying the same pattern for very long-time. Image might stick on LCD.

2-3 STORAGE PRECAUTION

(1) When you store LCD for a long time, it is recommended to keep the temperature between 0℃-40℃ without

the exposure of sunlight and to keep the humidity less than 85% RH. (2) Please do not leave the LCD in the environment of high humidity and high temperature such as 60℃, 85%RH. (3) Please do not leave the LCD in the environment of low temperature; below -25°C.

2-4 HIGH VOLTAGE WARNING

The high voltage was only generated by INVERTER module on Power Board, if carelessly contacted the transformer on this module, can cause a serious shock. (the lamp voltage after stable around 600V, with lamp current around 8mA, and the lamp starting voltage was around 1500V, at Ta=25°C)

1611

15510

PIN NO.

DESCRIPTION

PIN NO.

DESCRIPTION

RED Video

GREEN Video

10.

Sync Ground

BLUE Video

11.

RXD (for ISP)

TXD (for ISP)

12.

Serial Data for DDC

Ground

13.

HORIZ. SYNC

Ground-R

14.

VERT. SYNC

Ground-G

15.

Serial Clock for DDC

Ground-B

3. D-SUB PIN DISTRIBUTION

This procedure gives you instructions for installing and using the LCD TV display.

1. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.

2. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws on the connector to ensure firm grounding. The connector information is as follow:

15 - Pin Color Display Signal Cable

3. S-Video (Y/C): TV rear side : 4 pin Mini-DIN female

SCART 1: TV rear side : SCART female AV1: TV rear side : RCA female (Yellow ) Audio: TV rear side : RCA female (Red / White ) PC Input audio : 3.5mm Stereo female Headphone : 3.5mm female Audio line Out (to another speaker) : RCA female ( Red / White )

4. Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for Panel

warm-up. The Power-On indicator lights "GREEN" when the display is on.

5. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and

contrast to the most pleasing display, or press Auto-adjust to get the best picture-quality.

6. This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal cable to the PC.

7. If your TV requires service, it must be returned with the power cord.

VESA MODES

Horizontal

Vertical

Mode

Resolution

Nominal

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarity

DOS

720x400@70Hz

31.5 N 70.1

N 640x480@60Hz

31.469

59.940

640x480@72Hz

37.861

72.809

640x480@75Hz

37.500

75.00

800x600@60Hz

37.879

60.317

800x600@72Hz

48.077

72.188

800x600@75Hz

46.875

75.000

3-1 Factory Preset Display Modes:

Analog RGB Signal Timing

4. ADJUSTMENT

4-1 ADJUSTMENT CONTROL FUNCTION OPERATING INSTRUCTIONS

Adjustments items as below:

External Controls: (7-key knob)

Menu, CH Down, CH Up, Power On/Off, VOL Down, VOL Up, Source

OSD Control function:

TO USE THE MENUS

1. Press the MENU button repeatedly to display each menu.

2. Use the cursor up/down to select a menu item or adjust the setting of Menu item.

3. Use the cursor left/right to enter a submenu or enable the function.

4. Press the MENU button to exit the menu.

MAIN MENU

Press the MENU button into the main OSD (On Screen Display). Adjust item include VIDEO, AUDIO, TV (only in the TV mode), PC and PIP (only in the PC mode) and SETUP.

VIDEO Adjust

1. CONTRAST, BRIGHTNESS, COLOUR and TINT are adjusted from 0 to 100.

2. BLACK LEVEL is adjusted from 0 to 100.

3. SHARPNESS is adjusted from -5 to+5. You can adjust picture contrast, brightness, color, tint and sharpness to the levels you prefer.

4. RESET is set up to default value.

Note: TINT only work in NTSC video signal input.

AUDIO Adjust

When adjust any item sub-OSD will show up like this.

1. VOLUME is adjusted from 0 to 100.

2. BASS and TREBLE are adjusted from 0 to 100. You can adjust picture Volume, Bass and Treble to the levels you prefer.

When adjust any item sub-OSD will show up like this.

3. SRS for turn on / off SRS function. SRS is audio technology makes everything sound better.

Quick Installation

1. Use COUNTRY to select your country first.

2. Move to SCAN and scan the program.

3. After scan finished, user can use SKIP to skip the unlike program.

PROGRAM Editing

Using PROGRAM, FREQENCY, SWAP, and INSERT for program edit.

1. Move to PROGRAM, select the program you want to edit

2. Move to FREQENCY, use RIGHT or LEFT button for program search.

3. User can use SWAP for program swap.

4. Use INSERT to insert current program into selected position.

SETUP

1. BLUE SCREEN for when no video input screen will be blue or blank. If it’s ON, the screen will be in blue. If it’s OFF, the screen will be blank. Preset is ON.

1. LANGUAGE for different language OSD MENU. Preset is English.

2. SLEEP TIMER is for set a time period after which the TV should switch itself to standby. The counter runs from 0 > 30 > 60 > 90 > 120 minutes.

3. RESET is set up to default value of BLUE SCREEN and SLEEP TIMER.

Note: To view the remaining time, press the SLEEP button once. To cancel the sleep time, repeatedly press the SLEEP button until… APPEARS. If you turn the TV off after setting the sleep time, the setting will be erased. Set it again.

PC Setup

PC Adjust

1. AUTO TUNE is the function auto-sizing for VGA input.

2. CONTRAST, BRIGHTNESS, FOCUS, CLOCK, H-POSITION, V-POSITION and COLOUR are the functions for PC

adjustment.

Colour for you can adjust the colour temperature you prefer.

COLOUR

PIP

1. PIP for turn on / off small picture function.

2. POSITION for change the position of small picture.

3. SOURCE for select video source of small picture.

4. SOUND for select audio source form MAIN (PC) or SUB (Video).

Input Source Select:

Press repeatedly Source button to select TV, AV1, SCART, S-VIDEO or PC mode.

MENU Press repeatedly

to display OSD menu.

SLEEP

With this key you can set a time period after which the TV should switch itself to standby. Press the key repeatedly to select the number of minutes. The counter runs from 0,30,60,90,120 minutes. The timer begins to count down from the number of minutes selected after the display has disappeared.

POWER:

Press to turn on/off the TV. The TV is never completely powered off unless it is physically unplugged.

0~9 DIGIT BUTTONS

To select a TV channel.

TV/VIDEO

Select your input source: press repeatedly to select TV, AV, S-VIDEO or SCART mode, according to where you connected your external source.

VOL

Press + or – (or MENU

or button) to

adjust the volume.

MUTE

Temporarily interrupt the sound or restore it.

Press or (or MENU

▲ or ▼ button) to brows through the TV channels which are not erased.

PRE-CH

To display the previously selected TV channel.

SOUND

To select Mono/ Stereo /Dual from TV RF input.

Select your input source to PC.

DISPLAY

(1) Display Channel number

when use RF input.

(2) Display input source when

use other input except TV RF input.

SIZE

Includes 3 modes. Press repeatedly to select 4:3: to

16:9 (Linear) / 4:3 to 16:9 (non-Linear) /16:9 (option).

SWAP

Press to swap the two screens when PIP is work (option).

PIP/POP

Press to enable the screen of Video on Graphic (option).

SUBPAGE

Teletext Subpage function.

USE OF THE REMOTE CONTROL

Teletext function and buttons will describe on next page.

TEL

TELETEXT

Press TELETEXT. The Teletext screen appears. To turn off the Teletext mode, press TELETEXT again.

MIX

Press MIX to superimpose the teletext over a normal broadcast picture. Press again to return to Teletext mode.

SIZE

Press SIZE repeatedly to display the upper teletext part, the lower teletext part and then to return to the normal.

RED / GREEN / YELLOW / BLUE

Use the COLORED BUTTONS to operate the Teletext screen.

INDEX

Press INDEX to return to the main index page.

SUBTITLE

Press to select the next page marked as a subtitle page and request it as the display page.

HOLD

Press HOLD to hold the Teletext page when viewing information. Press again to return to automatic page update.

REVEAL

Press REVEAL to display reveal hidden words e.g. quiz page answers. Press again to hide.

PAGE SELECTION

Page can be selected in two ways. a. Press ▼or ▲ to increase or decrease the page number by one.

b. By entering the page number, using digit buttons 0~9.

SUBPAGE ACCESS

When Teletext information exceeds more than on page. Press SUBPAGE first then select the required page number using digit buttons 0~9.

Teletext is an information service organized like a magazine, which is provided by some TV stations in addition to regular television broadcasting.

4-2 ADJUSTMENT METHOD

Press MENU key to show OSD window or exit, Up / Down key to done the function selection, And + / - key to done the adjustment.

There is a wide range of video and audio equipment that can be connected to your TV. The following connection

diagrams show you how to connect them.

4-3 FRONT PANEL CONTROL KNOBS

Power Key： Press to turn on or off the TV. MENU Key：Press to show the OSD menu and exit OSD menu at the TV. CH Down / Up Key：Press to perform select function and channel. VOL - / + Key：Press to confirm your function selection and adjustment. Source Key：Press to select your input source.

No Display

Replace panel or FFC cable to panel

Replace L118, C137

Check U300 crystal X300 (12MHZ)

Replace X300

Check 2.5V L301-L304

3.3V L305-L308

Replace components if it has problem

Replace U300

Check CN101 pin 42-45 is 5V and signal on pin 35,37,39,40,25-28,30-33,1518,20-23,5-8,10-13

Check U300 Output to CN101 relative circuit and CN101 VCC at Q300, Q301, L309 (5V)

5-1.Panel Control Circuit:

5. TROUBLE SHOOTING CHART

5-2. Main Board Power Circuit:

5-3. Remote Control Block:

5-4. Key Board Control Block:

5-5. PC Control Block:

5-6. Audio Control Block:

5-7 Video Control Block:

Note: 1、If Replace “MAIN-BOARD” , Please re-do “DDC-content” programmed & “WHITE-Balance”.

2、If Replace “ POWER-BOARD INVERTER” only, Please re-do “ WHITE-Balance” 3、Please re-install program before you do change any component.

Color Temp.

9300

6500

9300

0.283

0.313

0.283

0.297

0.329

0.297

250±7

290±20

6. White-Balance, Luminance adjustment

Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.

Before started adjust white balance, please setting the Chroma-7120 MEM. Channel 1 to 9300 colors, MEM. Channel 2 to 6500 color, and MEM. Channel 3 to 9300 colors, (9300 parameter is x = 283 ± 15, y = 297 ± 15, Y = SPC. ± 7

cd/m2; 6500 parameter is x = 313 ± 15, y = 329 ± 15, Y = SPC.± 7 cd/m2)

How to setting MEM.channel you can reference to Chroma-7120 user guide or simple use “ SC” key and “ NEXT” key to modify x,y,Y value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance adjust

˙Press Number key 100  9  9  9 will into the factory mode, and press Menu key the OSD will show menu and a

word F at Right top of Menu.

˙In the factory mode select MORE function will into Bias and Gain adjustment.

1. ADC Adjustment: AL  Auto level adjust. RG, GG, BG  R, G, B Gain adjusts. RB, GB, BB  R, G, B Bias adjusts.

2. SCALER Adjustment: CO, BR  Contrast and Brightness adjust. RG, GG, BG  R, G, B Gain adjusts. RB, GB, BB  R, G, B Bias adjusts. S9, S6, ST, SH  Save 9300, 6500, 9300 color temperature. R9, R6, RT, RH Recall 9300, 6500, 9300-color temperature. BI  Setup Burn-in mode ON / OFF. ISP Set ISP ON/OFF. PP  Set PIP ON/OFF. WH  Set Wireless Headphone ON/OFF. SR  Set SRS ON/OFF. CC  Set Close Caption ON/OFF. VC  Set V Chip ON/OFF. EX  Exit MORE function to factory mode menu.

II. Bias (Low luminance) adjustment:

1. Press “ AUTO” button,

2. Set the contrast on OSD window to the value=51, color (user) R, G, B set to “50”

3. Adjust the brightness on OSD until chroma 7120 measurement reach the value Y>390 cd/m2

III. Gain adjustment:

A. Adjust 9300 color-temperature:

1. Set the Contrast of OSD function to 45 and Adjust Brightness to chroma-7120 Y>230 cd/m2

2. Switch the chroma-7120 to RGB-mode (with press “MODE” button)

3. Switch the MEM.channel to Channel 01 (with up or down arrow on chroma-7120)

4. The lcd-indicator on chroma-7120 will show x = 283 ± 15, y = 297 ± 15, Y =250 ± 7 cd/m2

5. Adjust the Color(user)Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100

6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value G=100

7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100

8. Repeat above procedure (Item 5,6,7) until chroma-7120 RGB value meet the tolerance =100±2

9. Switch the chroma-7120 to xyY mode With press “MODE” button

10. Press Color (9300) on OSD window to save the adjustment result

B.Adjust 6500 color-temperature:

1. Set the Contrast of OSD function to 45 and Adjust Brightness to chroma-7120 Y>230 cd/m2

2. Switch the chroma-7120 to RGB-mode (with press “MODE” button)

3. Switch the MEM.channel to Channel 02 (with up or down arrow on chroma-7120)

4. The lcd-indicator on chroma-7120 will show x = 313 ± 15, y = 329 ± 15, Y = 250 ± 7 cd/m2

5. Adjust the Color (user) Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100

6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value G=100

7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100

8. Repeat above procedure (item 5,6,7) until chroma-7120 RGB value meet the tolerance =100 ± 2

9. Switch the chroma-7120 to xyY mode with press “MODE” button

10.Press Color (6500) on OSD window to save the adjustment result C. Adjust 9300 color-temperature:

1. Set the Contrast of OSD function to 45 and Adjust Brightness to chroma-7120 Y>280 cd/m2

2. Switch the chroma-7120 to RGB-mode (with press “MODE” button)

3. Switch the MEM.channel to Channel 03 (with up or down arrow on chroma-7120)

4. The lcd-indicator on chroma-7120 will show x = 283 ± 15, y = 297 ± 15, Y = 290 ± 20 cd/m2

5. Adjust the Color (user) Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100

6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value G=100

7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100

8. Repeat above procedure (item 5,6,7) until chroma-7120 RGB value meet the tolerance =100 ± 2

9. Switch the chroma-7120 to xyY mode with press “MODE” button

10. Press Color (9300) on OSD window to save the adjustment result

Turn the POWER-button off to on to quit from factory mode (in USER-mode, the OSD window location was placed at middle of screen)

7. SOFTWARE FLOW CHART

8. BLOCK DIAGRAM

20” LCD TV Block Diagram

Tuner

FQ1216ME

PAL

SAA5361HL

Teletext

VPC 3230

Decoder

E-Frame

Input

option

Key PAD

SPV301/302A

Scaler

OSD

MCU

Panel

Inverter

ANT

DRAM

VIDEO 1

SCART CVBS

CVBS

S-VIDEO

9883

PC D-SUB

MSP3415G

AVDIO decoder

Audio

AMP

7266D

Head phone

Speaker (2W x 2)

AC 110/220V

Adapter

70W

12V/5V

74HC4052 D

PT2308

EAR AMP

SRS M62438

NJM2244 M

8-1 MAIN BOARD BLOCK DIAGRAM

+ 56 hidden pages