Panasonic Services Company

Panasonic Services Company

National Training

Automotive Consumer Electronics

Troubleshooting Technical Guide

CY-VMD9000U In-dash 7 Wide Color LCD Monitor /DVD-video,

CD Player

Warning

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

Introduction

The purpose of this guide is to provide the technician with the knowledge and skills necessary to efficiently repair the Panasonic In-dash 7 Wide Color LCD

Monitor /DVD-video, CD Player, model number CY-VMD9000U.

Information about operation, circuit’s description, block diagrams, signals flow and troubleshooting techniques are provided in this book.

2

Table of Contents

Service Notes ......................................................................................................5

ID code ..............................................................................................................5

How to cancel the UNKNOWN ID-CODE by service technician........................5

Reset switch ......................................................................................................5

Reset switch ......................................................................................................6

Service Cable ....................................................................................................6

Description ..........................................................................................................7

CY-VMD9000U In-dash 7 wide color LCD monitor/DVD-video, CD player .......7

CD-TU9000U Multi Channel AV Control Unit Receiver .....................................7

Features ...............................................................................................................8

CY-VMD9000U – In-Dash 7” diagonal wide color LCD monitor / DVD video player ................................................................................................................8

Display unit........................................................................................................8

Control unit ........................................................................................................8

CA-TU9000U – Multi-Channel AV Control Amplifier Unit ..................................8

Wiring connection...............................................................................................9

Wiring Diagram................................................................................................10

Connection with Multi channel AV Control Unit with Receiver (CA-TU9000U) 12

Connection with AV Control Unit with Receiver (CA-TU7000U) ......................14

Connection with CD Changer (CX-DP88U) .....................................................16

Connection with VCR or Camcorder ...............................................................17

System control ..................................................................................................18

I

Requirements ..................................................................................................18

2

C Bus system................................................................................................18

IC601 and IC602 Location...............................................................................19

Circuit description............................................................................................20

Power On ........................................................................................................20

CPU BUS communication system block diagram............................................21

System Control block diagram.........................................................................22

LCD Open/Close operation .............................................................................23

LCD Open/Close operation block diagram ......................................................25

Voltage test points...........................................................................................26

Test Points voltage table .................................................................................27

Power Supply ....................................................................................................28

Main Power Supply .........................................................................................28

Main Power Supply block diagram ..................................................................29

Power Source PCB .........................................................................................30

DC/DC converter .............................................................................................30

LCD/Video DC/DC converter...........................................................................30

LCD/Video DC/DC converter block diagram ...................................................32

Waveforms ......................................................................................................33

Backlight..........................................................................................................35

Cold Cathode Lamp parameters .....................................................................35

3

Principle of lighting ..........................................................................................35

Dimming ..........................................................................................................35

Circuit description............................................................................................36

The ballast capacitor (C975), placed in series with the lamp, helps to stabilize the current and to adjust the voltage over the tube to nominal level................36

Ballast circuit diagram .....................................................................................37

Troubleshooting...............................................................................................38

Ballast circuit location......................................................................................38

Transistor voltage and signal waveform ..........................................................40

Transistor voltage and signal waveform ..........................................................41

Wave form .......................................................................................................42

Video circuit ......................................................................................................43

Video signal path output to the LCD Panel......................................................43

Video signal path output to Video Out jack......................................................43

LCD Video signal path block diagram .............................................................44

Video out jack signal path block diagram ........................................................45

Audio circuit .....................................................................................................45

Audio circuit ......................................................................................................46

Circuit description............................................................................................46

CY-VMD9000U only ........................................................................................46

Speaker signal output......................................................................................46

Speaker audio block diagram ..........................................................................47

Pre-amp signal output .....................................................................................48

Video Out audio output....................................................................................48

Pre-amp output block diagram ........................................................................49

Video Out audio output block diagram ............................................................50

Navigation audio path......................................................................................51

DVD/CD audio path.........................................................................................51

VTR1/VTR2 audio path ...................................................................................51

Navigation audio block diagram ......................................................................52

CY-VMD9000U combined with the Multi Channel AV Control Unit with

Receiver (CA-TU9000U or CA-TU7000U).......................................................53

DVD/CD, VTR1 and VTR2 audio path.............................................................53

Audio path block diagram of CY-VMD9000U when combined with CA-

TU9000U .........................................................................................................54

4

Service Notes

ID code

Prior to operating this unit, it is advisable to assign a 4-digit ID code for security.

(Be sure to use four digits for ID code. The ID code cannot be set with two or three digits.)

Once the ID code has been set, the unit cannot be operated if the main power supply is disconnected and then reconnected. It is electronically locked so that a thief could not use the stolen unit unless that person knows the code you have set.

Generally, it is not necessary to enter the ID code each time the unit is going to be used if it has never been disconnected from the main power supply (Battery).

For ID code setting, refer to page 50 of Operating Instructions manual.

How to cancel the UNKNOWN ID-CODE by service technician

For security reason, this information will not be available in the Operating

Instructions manual.

1. Turn on the power

“INPUT THE ID-CODE” screen will be displayed on the LCD panel.

INPUT THE ID-CODE

This product will not operate with an invalid ID-CODE

Figure 1

2. Press and hold the “TRACK>” button for more than 10 seconds or until the beep sound is heard. This can be done from the unit or the remote.

3. The “WARNING” screen will be displayed and the canceling procedure is completed.

Figure 2

5

Reset switch

If unit fails to operate with any buttons, try resetting it. To do this, find the reset switch located to the left of the “DISC/BAND” (JOYSTICK) switch and insert a paper clip into the hole and push the switch.

Press the reset button while the Display unit is connected to the Control unit.

The unit returns to the default state when it is reset, and the data and settings stored in the memory are deleted.

Figure 3

Reset button

Service Cable

Model: 9000 series

YESFZS2041 (2 Cables Kit)

Main PCB to Power Source PCB and Main PCB to Switch PCB

YESFZS2042 (2 Cables Kit)

Main PCB to DVD/CD

YESFZS2043 (Servo PCB to Mechanism)

6

Description

CY-VMD9000U In-dash 7 wide color LCD monitor/DVD-video, CD player

The CY-VMD9000U is a combination of the Display Unit and the Control Unit.

It can be used by itself (Using the Display and Control Units), and it can also be used in combination with the CA-TU9000U multi channel AV control unit with receiver, or the CA-TU7000U AV control unit with receiver.

By itself, it does not have an AM/FM Radio, a CD Changer controller, or Optical

Digital connections.

Display Unit Control Unit

Figure 4

CD-TU9000U Multi Channel AV Control Unit Receiver

Figure 5

7

Features

CY-VMD9000U – In-Dash 7” diagonal wide color LCD monitor /

DVD video player

Display unit

• 7-inches wide LCD color display

• Fully electrically operated mechanism

• Built-in Automatic Dimmer Function

• Motorized open/close, flip up/down, front/rear positioning and left/right swivel

• Selectable 5 tilt angles and 2 horizontal positions with memory

• One-touch tilt for easy access

• TFT active matrix LCD drive

• Selectable Display Modes: NORMAL, FULL, ZOOM, JUST

• DVD Video, Video CD and Music CD playback

• 4-digit ID code security

• On screen menus and user setup display

• Hideaway junction box

• RGB input for future Panasonic Navigation

Control unit

CA-TU9000U – Multi-Channel AV Control Amplifier Unit

• Discrete 4-channel MOS-FET high-power amp (45W x 4 max)

• Dedicated center channel amp (35W max)

• CD changer control

• Dolby Digital & DTS double decoder

• Dolby Surround decoder with Pro Logic circuit

• 7 sound field presets (for 2 Ch analog or liner PCM source only)

• 7-band graphic equalizer with 6 user preset (for 2 Ch analog or liner PCM source only)

• 12 AM and 12 FM presets with preset scan

• Private mode during front/rear dual program playback

8

Wiring connection

Warning:

To avoid risk of serious injury or possible violation of laws, do not use where visible to driver for any purpose other than NAVIGATION or use with REAR

VIEW CAMERA.

This system is designed so that you cannot see picture from DVD, VCR and other devices while you are driving.

This is done by allowing the picture to be displayed in DVD mode, VTR 1 mode, and TV mode only when the parking brake is engaged.

For this reason, when working on this unit on the bench, make sure to ground the

“Side brake” lead, otherwise the unit will display a “WARNING” message instead of showing the picture.

WARNING

ENJOY THE MUSIC

Figure 6

For more information on this refer to page 78 of the Operating instruction manual.

This unit will function as a rear view camera monitor using the VTR 2 input.

When the vehicle is shifted to reverse, the unit switches to VTR 2 automatically.

To simulate the reverse action of the car on the bench, connect the reverse lead to +12V.

Note: While the car is in reverse, some of the operating functions of the unit will not function (MENU, MODE, NAVI and TRACK/CHANGE).

9

Wiring Diagram

Figure 7

10

Figure 8

11

Connection with Multi channel AV Control Unit with Receiver

(CA-TU9000U)

Figure 9

12

Figure 10

13

Connection with AV Control Unit with Receiver (CA-TU7000U)

Figure 11

14

Figure 12

15

Connection with CD Changer (CX-DP88U)

Figure 13

16

Connection with VCR or Camcorder

Figure 14

17

System control

System control CPU (IC601), located on the Main PCB, plays a very important role in the operation of the unit

• It controls the video signal processor IC807 and the TFT controller IC901.

• Generates character and letters for OSDC controller IC805.

• Switches modes with the command signal from the remote controller.

• Communicates with the sub-CPU IC601on the control unit.

• Controls the switching timing for audio/video switch IC802)

• Controls the CD changer.

• Controls the Electronic volume IC811)

• Output the mute signal

• Generates the beep sound.

Requirements

In order for the CPU (IC601) to work properly, it must have the following requirements.

A well regulated power source VDD

+5V DC are applied to pin 8 and pin 66 of the CPU (IC601). This voltage is

always present as long as a +12V source is connected.

A power return (GND)

pins 26,22,24,26,38,39,46 and 71 are all connected to ground.

Oscillator to sequence the execution of its programs

The crystal Xl602 is connected to pin49 and pin 50 of the CPU

Reset Circuit connected to pin 11 of the CPU to clear the CPU registers and to signal the start of the CPU program execution.

Note: For POWER ON condition there has to be communication between the

Main CPU on the Display Unit and the sub-CPU in the Control Unit.

I

2

C Bus system

This unit incorporates an I

2

C (Inter-Integrated Circuit) Bus. The I

2

C Bus is a double polarity bus that uses two lines, the SDA (Serial data) line and the SCK

(Serial clock) line to carry information between devices connected to the bus.

Each device connected to the bus has an unique address for data transfer.

The devices on the bus are considered to be “Master or Slave” when data is transmitted or received.

The EEprom, (IC602) is the device connected to this bus line for memory storage. It keeps default settings and customer's settings. The customer’s settings are erased when power (+12V) is removed.

The master, (CPU IC601) initiates a data transfer in the bus line and generates the clock signal required to permit the data to be sent.

The slaves are the devices addressed by the CPU and receive the transmitted data.

18

IC601 and IC602 Location

IC 602

EEprom

Figure 15

IC 601

CPU

19

Circuit description

The unit is considered to be in standby mode when the BATT+12V from the battery and the switched ACC+12V from the ignition are present on pin 16 and pin 2 of connector CN701respectively. The blue light on the front panel indicates standby mode.

The BATT +12V and the +12V ACC are applied to the VDD 5V Reg. transistor

Q701. The regulated 5V is applied to pin 8 and pin 66 of the CPU (IC601).

At the same time the BATT and ACC +12V are applied to the BATTERY/ACC detect IC, (IC704) which supply the ACC sensor and BATTERY sensor voltages

to the CPU. (See Fig. 7 page 22)

When the CPU (IC601) receives the BATT and the ACC sensors voltages, it sends a high command out of pin 62 (SYS POWER).

The control voltage out of pin 62 (SYS POWER) of the CPU, (IC601) is applied to the DC/DC converter control IC (IC703), where the SYS 5V, SYS 3.3V, are immediately generated.

Note: IC 703 also generates DV 5V, 3.3V, 2.5V and 1.8V, but they are present only when the circuit receives the proper control voltage from the CPU.

The control voltage out of pin 62 (SYS POWER) is also applied to the SW+12V regulator circuit (Q701, Q702) and the 10V regulator (IC 702) where with the proper control signals the AU10V and the CD10V are generated.

Power On

Note: The unit will only turn on when the Display Unit is connected to the Control

Unit. The reason for this is that the Main CPU in the Main board (IC601), needs to communicate with the sub-CPU in the Control Unit (IC601) through the BUS line between the Bus interfaces (IC603 on the Main PCB and IC605 in the

Control Unit ). (See Fig. 16 page 21)

When the POWER is turned on, the voltage on pin 91(A/D_KEY 1) of IC601 goes low, and the voltage on pin 63 (MAIN PWR) goes high. This control voltage is applied to the AUDIO +10V circuit (Q705, Q725 and Q726).

(See Fig. 17 page 22)

20

CPU BUS communication system block

MAIN PCB DISPLAY UNIT

IC601

MAIN CPU

82

44

43

35

34

33

INH

CAN_RX

CAN_TX

EN

/STB

/ERR

Back to Text

CAN H

11

IC603

BUS I/F

CAN L

12

BUS+-

BUS-

IC601

SUB-CPU

CONTROL UNIT

BUS_TX

63

62

40

39

38

19

BUS_RX

EN

/STB

/ERR

CAN_INH

CN502

1 13 15 20

1 13 15 20

CN701

CAN L

12

IC605

BUS

CAN H

11

BUS-

BUS+

CN702

15 2 1

Figure 16

21

System Control block diagram

SYSTEM CONTROL BLOCK DIAGRAM

Back to Text

TO CN151

SWITCH

PCB

6

7

8

1

CN803

9

14

SYS

5V

IC501

SYS

5V

Q722-723

FAN

DRIVE

TP604

I²C DAT A

5

IC602

EEPROM

I²C SCK

VCC

8

6

11

23

91~93 32

RESET

RM DAT A

A/D_KEY 1

A/D_KEY 2

A/D_KEY 3

42

FAN

CNT

25

MOT OR_CNT A

49

50

55

SW+B

+12V

MOT OR_CNT B

56

XL602

M A

M B

SYS P OWER

29

CD

10V

Q703

Q704

CD 10V

8

VDD

MOT OR_CNT C

57

IC702

REG

M C

CN701

BATT

+12V

16

ACC

2

+12V

TO CAR

HARNESS

1

CN802

(LCD DC/

DC CONV.

1

CONT ROL

VOLT AGE)

TO PWR

SOURCE

PCB

CN402

23

30

Q706

5V VDD

REG

D701

AU

10V

Q705

T P601

VDD

66

PRT VDD

IC601

CPU

Q725

Q726

P WR

SW

A/D_KEY 4

94

SYS P OWER

62

D702

MAIN P OWER

63

SYS

5V

VDD

BAT T

+12V

ACC

+12V

7

2

1

IC704

BATT/ACC

DET.

3

8

ACC

SENS

48

45

MONI_CONT

64

1

CD_CONT

GND

BATT

SENS

TP602

70

DV_CONT

MAIN POWER

SYS

5V

24

CN802

BAT T

+12V

Q701

Q702

SW +B

REG

28

27

IC703

DC -DC

C O NV.

18

CN704

1

2

TO FAN

NOT E:

PIN1~P IN30 OF

CONNECT OR

CN403,GO T O

T HE LCD

PANEL- CN901

CN402

29

28

27

24

CN403

40

39

38

18

PO W ER

SO URC E

PC B

CN901

SW901

OPEN

CLOSE

1

T O LCD

PANEL

SLIDE

MECHA

ASS'Y

13

MO NITO R

BLO C K

SW902

T ILT

30

Figure 17

22

LCD Open/Close operation

The LCD unit can be opened/closed while the unit is off (on standby).

When the unit is “ON” and the “open” button on the LCD unit is pressed,

A low command is applied to pin 94 of the CPU.

At this point the LCD is drawn-in and the close switch SW602 should be closed grounding pin 53 of the CPU (IC601).

SLIDE MECHANISM

ASS'Y

LCD

S W 601

OPEN

MAIN PCB

Figure 18

S W 602

CLOSE

The CPU outputs a sequence of control voltages on pin 55, 56 and 57 used by the loading motor drive circuit on the LCD PANEL MECHANISM ASS’Y to draw

the LCD in or out. (See Fig. 22 page 25)

When the LCD is fully drawn out horizontally, the “OPEN” switch SW601 is now closed, sending a “LOW” condition to pin 52 of the CPU (IC601).

SLIDE MECHANISM

ASS'Y

LCD

S W 601

OPEN

Figure 19

MAIN PCB

S W 602

CLOSE

23

When pin 52 goes low, the voltage configuration out of pin 55, pin 56 and pin 57, changes, targeting the tilt motor drive circuit this time, making it rotate to open the LCD.

FRONT

LCD

SLIDE MECHANISM

ASS'Y

S W 601

OPEN

MAIN PCB

S W 602

CLOSE

Figure 20

When the LCD rotates, the “NECK” switch opens up and pin 51 goes “HIGH”.

NOTE: While the LCD is in the horizontal position, the “NECK” switch will be held closed, providing a “LOW” condition on pin 51 of the CPU.

When pin 51 goes “HIGH”, pin 64 (MONI_CONT) also goes “HIGH”. The control voltage out of pin 64 is used to turn on the LCD/VIDEO DC/DC Converter circuit.

NECK

SWITCH

LOADING

MOTOR

PANASONIC

Figure 21

TILT

MOTOR

24

LCD Open/Close operation block diagram

VDD

5V

R609

SW602

CLOSE

SW

R612

SW601

OPEN

SW

Back to Text

Go to pg 30

RA604

VDD

5V

PO W ER

SO URC E

PC B

53

CLOSE SW

52

OPEN SW

NECK

SW

51

MOT OR_CNT A

55

MOT OR_CNT B

56

MOT OR_CNT C

57

M A

M B

M C

CN802 CN402

26 26

35

29 29 40

CN403

28

27

24

28

27

24

39

38

18

A/D_KEY 4

94

IC601

CPU

MONI_CONT 64

SYS

5V

23 23

Q404

CN901

1 13 30

CN501

1

SW901

OPEN

CLOSE

SW902

T ILT

MO TO R DRIVE

C IRC UIT

MO NITO R

BLO C K

Figure 22

SLIDE MEC HANISM

ASS'Y

10

NECK

SW

25

Voltage test points

IC601

CPU

Front of Unit

TP601

+5V VDD

NECK_SW

PIN 51 IC601

SYS POWER

PIN 62 IC601

MONI_CONT

PIN 64 IC601

MAIN PWR

PIN 63 IC601

DV_CONT

PIN 70 IC601

Figure 23

26

Test Points voltage table

Status

ACC_OFF

TP601

+5V

VDD

IC601 IC601 IC601 IC601

PIN 62

SYS_PWR

PIN 63

MAIN_PWR

PIN 64

MONI_CONT

PIN 70

CD_CONT

5V 0V 0V 0V 0V

ACC_ON

5V 5V 0V 0V 0V

PWR_ON

LCD_OPEN

5V 5V 5V 0V 0V

5V 5V 5V 5V 0V

DVD/CD_ON

5V 5V 5V 5V 5V

Figure 24

27

Power Supply

This unit has two DC/DC converter circuits and a backlight ballast circuit.

One of the DC/DC converter circuit is located in the Main board and it is

controlled by IC703. (See Fig. 25 page29)

This circuit is turned on when it receives the SYS_PWR control voltage from the

CPU, which is developed when the CPU (IC601) receives the BATT+12V and the

ACC +12V.

This circuit generates the SYS 5V and the SYS 3V, which are then used as the source for DV+5V, 3.3V, 2.5V, and 1.8V.

The other DC/DC converter circuit is located in the Power Source PCB, and it is

controlled by IC401. (See Fig. 26 page 32)

This circuit is turned on when it receives the MONI_CONT voltage from the CPU

(IC601), It generates the BL 8V for the ballast circuit, the DD5V, DD3.3V, DD17V used by the LCD panel and the video circuit (IC805 and IC807), and the DD-15V used by the LCD panel.

The Backlight Ballast Circuit is located in the LCD Drive PCB, and it is used to turn on the LCD backlight.

Main Power Supply

The BATT +12V and the +12V ACC are applied to the VDD 5V Reg. transistor

Q706. The regulated 5V is applied to pin 8 and pin 66 of the CPU (IC601).

At the same time the BATT and ACC +12V are applied to the BATTERY/ACC detect IC, (IC704) which supply the ACC sensor and BATTERY sensor voltages to the CPU.

When the CPU (IC601) receives the BATT and the ACC sensors voltages, it sends a high command out of pin 62 (SYS POWER).

The control voltage out of pin 62 (SYS POWER) of the CPU, (IC601) is applied to the DC/DC converter control IC (IC703), where the SYS 5V, SYS 3.3V, are immediately generated.

Note: IC 703 also generates DV 5V, 3.3V, 2.5V and 1.8V, but they will only come on when the circuit receives the proper control voltage from the CPU.

28

Main Power Supply block diagram

CONT ROL

Q713-Q714

REG

IC701

REG

CONT ROL

DV

5V

3.3V

SYS

5V

SYS

3.3V

Q729

SOFT

ST ART

Back to Text

Q715 & Q720

VOLTAGE

CHECK

Q716

ON/OFF

DRIVE

2-4

7-8

BATT

12V

Q719 & Q721

VOLTAGE

CHECK

2-4

Q718

ON/OFF

DRIVE

7-8

9

VS1

8

11

OUT H/L1

IC703

18

4

CS1

21 CS2

VB

13

13

17

OUT H/L2

VCC VS2

23 16

Q717

REG

CTL

20 70

CNT_3.3

DV_CNT

CPU

IC601

62

SYS P WR

CNT _2.5

CNT_1.8

19 18

BATT

12V

CONT ROL

IC705

REG

2.5V

IC706

REG

CONT ROL

Figure 25

1.8V

29

Power Source PCB

DC/DC converter

A DC-to-DC converter is a device that accepts a DC input voltage and produces a DC output voltage. Typically the output produced is at a different voltage level than the input. In addition, DC-to-DC converters are used to provide noise isolation, power bus regulation, etc.

This circuit is able to endure short-circuit for several seconds, not indefinitely

LCD/Video DC/DC converter

The DC/DC converter circuit located on the Power Source PCB generates the voltages necessary to drive the LCD panel, the Video Signal Processor (IC807), the OSD control (IC805), and the Backlight 8V.

The DC/DC control, (IC401) consists of a saw-tooth oscillator, an error amplifier and PMW comparator.

Circuit oscillator

A triangular waveform of any frequency is obtained by connecting an external capacitor and resistor to the CT (pin 1) and RT terminals (pin 2).

The amplitude of this waveform is from 1.3 V to 1.9 V. The oscillator is internally connected to the non-inverting inputs of the PWM comparators.

The oscillator waveform is available at the CT terminal (pin 1).

Operation

After the unit has been turned on, and the open/close switch (SW901) is pressed, the LCD panel is ejected and flipped to the viewing position, opening the “NECK” switch.

When the “NECK” switch is opened, it sends a “HIGH” command to pin 51 of the

CPU (IC601) causing pin 64 (MONI_CONT) goes “HIGH”. (See Fig. 22 page 25)

The “Monitor Control” voltage from pin 64 is applied to the power switch transistor Q404 to turn on the DC/DC control (IC401) by applying +12V to pin 9.

When IC401 receives +12V on pin 9, it outputs two control pulses, one out of pin

7, and the other one out of pin 10 . (See Fig. 26 page 32)

The control pulse out of pin 7 is applied to Q402 and Q403 where the backlight

(BL +8V) is generated. Any current changes on this line are detected by the current detect transistor Q401and reported to pin 15 of IC401.

The control pulse out of pin 10 is applied to the drive transistors Q406 and Q407.

30

This pulse is used to drive the transformer T401 generating the DD5V, DD3.3V,

DD17V used by the video circuit (IC805 and IC807), and the LCD panel, plus the

DD-15V used by the LCD panel.

31

Back to Text

LCD/Video DC/DC converter block diagram

LCD DC/DC CONVERTER BLOCK DIAGRAM (POWER SOURCE)

Go to pg 30

POWER SOURCE PCB

9

VCC

IN1+

3

OUT 1

7

IC401

SCP

15

Q402~403

ON/OFF

DRIVE

Q401

CURR

DET

Q405

CURR

DET

T401

BL 8V

TO MO NITO R

BLO C K

CN403

1

DD5V

8

DD3.3V

6

DD17V

9

7

OUT 2

10

IN2+

14

Q406~407

ON/OFF

DRIVE

1

8

DD-15

Q411

REG

34

40

VR401

Q404

PWR

SW

MONI CONT

CN401

1

BATT

+12V

2

CN702

1 2

3

3

SW +12V T O SLIDE MECHANISM

4

4

30

30

23

23

5

5

7

7

3

3

30

CN402

30

CN802

D709

L704

+12V

16

Q701

Q702

SW +B

REG

SYS PWR

D701

1

GND

CN701

64

IC601

62

CPU

SYS

PWR

MONI

CONT

5

IC805

OS D

CTL

Q803

7.5V

REG

6

58

29

VCC1

VCC3

VCC

VCC5

IC807

25

44 VCC

VIDEO SIGNAL

PROCESSOR

MAIN PCB

Figure 26

32

Waveforms

Figure 27

33

Figure 28

34

Backlight

The liquid crystal display panel differs from a cathode ray tube in that the LCD is a non-luminous type flat display that does not radiate light by itself. A Cold

Cathode Lamp generates a uniform light from behind the panel so it can be used at night or indoors.

The life expectancy of the lamp is approximately 10,000 hours.

Cold Cathode Lamp parameters

Starting or Discharge Voltage is the minimum voltage required to “start” or ignite the Cold Cathode Lamp. This is generally expressed as a minimum rms voltage at some ambient temperature (generally the minimum temperature for the display or tube).

The starting voltage is the primary parameter, which determines “end of life” for the tube and therefore the usefulness of the LCD module. If a voltage less than the minimum starting voltage is applied to the tube it will not light.

The starting voltage of most Cold Cathode Lamps is both time and temperature dependent. The older and colder the tube is, the higher the starting voltage is.

Generally the minimum starting voltage specification is tied (directly or indirectly) to a life specification for the Cold Cathode Lamp) and the LCD module.

The output voltage of the inverter, measured at the Cold Cathode Lamp, must be equal to or greater than the minimum starting voltage specified at minimum operating temperature and maximum life of the Cold Cathode Lamp.

Since the starting voltage (approximately 2000V AC) required by the Cold

Cathode Lamp increases with time this relationship must be validated during the design stage of the system.

This cannot be easily tested since the starting voltage of an aged Cold Cathode

Lamp can be more than 50% higher than for a new one.

The normal operating voltage is approximately 600V AC.

Principle of lighting

The lighting circuit turns on a discharge tube by converting DC to AC and stepping up the voltage using a self-excitation type DC-AC inverter

Dimming

A pulse width modulation signal controls the brightness of the tube(s) by turning the inverter (and therefore the tubes) on and off rapidly and controlling the lamp duty cycle.

35

Pulse width modulation is a very straight -forward method for controlling the brightness of cold cathode lamp.

The “on” duty cycle is increased to increase the brightness and is decreased to decrease the brightness.

One of the major advantages of pulse width modulation is that the tube is always fully “on” or fully “off” and full starting voltage is always applied to the tube

(assuming nominal input voltage is present at the input of the inverter).

Circuit description

When the LCD panel starts to open, the position of the “NECK” switch changes from closed to open providing 5V to pin 51 of the CPU (IC601).

When pin 51 goes “HIGH”, the MONITOR CONTROL” pin (pin64) also goes high.

This control voltage is used to turn on the DC/DC converter circuit in the

“POWER SOURCE” PCB by providing 12V to pin 9 of the DC/DC converter

controller IC (IC401). (See Fig. 26 page 32)

This circuit, besides generating the voltages necessary to drive the LCD panel and the video circuit, also generates the “BALLAST” 8V, which are used to turn on the ballast circuit.

The ballast circuit is a DC to AC converter circuit used to generate the voltage necessary to turn on the backlight.

A PWM signal controlled by the intensity of the light reflected on the dimmer sensor IC906, is applied to the amplifier circuit (Q912, Q913) where the signal is amplified and feed to an oscillator circuit (Q914, Q915 and T901).

Q914 and Q915 drive the step-up transformer (T901) with the oscillated voltage

generating the start-up high voltage. (See Fig. 29 page 37)

Under normal lighting condition, the voltage out of IC906 (pin 1) is around 4.1V

DC, and it’s reduced as the sensor receives less light.

This voltage is applied to pin 98 of the microprocessor IC601. The micro processes this information and communicates with the video signal processor

IC807 through the I²C Data and I²C Clock lines to generate the PWM signal out of pin 30.

The voltage across pin 7 and pin 12 of the secondary winding of the transformer

(T901) is the output voltage of the circuit and it is connected to the lamp through the connector CN903.

The ballast capacitor (C975), placed in series with the lamp, helps to stabilize the current and to adjust the voltage over the tube to nominal level

.

36

Ballast circuit diagram

I

2

C DATA

L812

R876

47K

5V

Q805

Back to Text

23

CPU

IC601

25

I

2

C C LO C K

48

47

IC807

VIDEO SIGNAL

PROCESSOR

PWM

30

PWM

DIM SENS

4.2V

98

C986

R998

1

IC 906

DIMMER

SENSO R

3

R997

100

2

D GND

C985

R977

27K

8V

R978

27K

Q913

L921

R979

470

C972

Q912

R980

1.5K

Q914

5V

Lamp control

Signal

LP CNT

2

A02

IC905

D/A

Converter

Q911

BL GND

C971

R981

1.5K

Q915

CY-VMD9000U BALLAST CIRCT

Figure 29

1

2

3

4

5

6

T901

12

8

C975

TO LCD

37

Troubleshooting

To protect the face of the LCD panel during service, we cover the LCD panel with a piece of foam or cardboard.

The ballast circuit is located on the LCD Monitor PCB and it’s divided into 2 sections for easy components access. One section is located at the bottom of the front panel, and the other one is located on the rear of the panel at the bottom right.

Ballast circuit location

The components highlighted within the dotted areas “A and B” are located at the bottom of the front panel.

I

2

C DATA

L812

R876

47K

Q805

5V

23

CPU

IC601

25

I

2

C C LO C K

48

47

IC807

VIDEO SIGNAL

PROCESSOR

PWM

30

B

A

DIM SENS

4.2V

98

R998

C986

C

R977

27K

8V

PWM

L921

C972

4

5

6

1

2

3

12

8

1

IC 906

DIMMER

SENSO R

3

2

R997

100

D GND

C985

R978

27K

Q912

Q913

R979

470

R980

1.5K

Q914

T901

C975

5V

Lamp control

Signal

LP CNT

2

A02

IC905

D/A

Converter

Q911

BL GND

C971

R981

1.5K

Q915

CY-VMD9000U BALLAST CIRCT

TO LCD

Figure 30

38

LCD

PANEL

(FRONT)

Area A

Figure 31

Area B

The components highlighted within the dotted area “C” are located on the rear of the panel at the bottom right.

LCD

Panel

Rear

View

Area C

Figure 32

39

Area A

IC906

Area B

L921

Figure 33

T901 C975

CN903

Area C

Figure 34

40

Transistor voltage and signal waveform

Normal lighting condition

Transistor

DC

Voltage

Waveform

Sensor completely covered

DC

Voltage

Waveform

C

B

C

E

B

C

E

Q915

Q914

Q913

C

C

E

B

B

-0.9VDC WF1 0.5VDC N/A

C

7.6VDC WF2 7.6VDC N/A

E

GROUND

B

-0.9VDC

C

7.6VDC

WF1

WF2

0.5VDC

7.6VDC

N/A

N/A

E

GROUND

E

7.83VDC 7.9VDC

C

7.7VDC 1.3VDC

B

7.1VDC 7.7VDC

C

E

B

E

C

0VDC

GROUND

6.5VDC WF5

Q912

B

3VDC 0.5VDC WF4

E

GROUND

E

C

C

B

Q911

B

0.04VDC 0.04VDC

Figure 35

41

Wave form

Figure 36

42

Video circuit

This unit is capable of displaying video signals from 3 different sources: the builtin DVD player and the 2 video line-in inputs (VTR1 and VTR2).

The selected signal can be displayed on the LCD panel and it can also be output to the Video Out jack in the Control Unit.

Video signal path output to the LCD Panel

The Audio/Video switch (IC802), is responsible for selecting the video signal which is going to be displayed on the LCD panel.

The DVD video from the Audio/Video decoder IC (IC5) in the Servo PCB, is applied to the Audio/Video switch (IC802) in the Main PCB.

The NAVIGATION video is connected to pin 4 of IC802.

The Audio/Video switch (IC201) in the Control unit, switches between the VTR1 signal and the VTR2 signal. The selected video signal is output on pin 23. (See

Fig. 37 page 44)

The selected video signal is fed through a high pass filter (Q806~Q808) before it is separated into luminance/chrominance.

The separated luminance/chrominance signals are then applied to pin 52 and pin

57 of the Video signal Processor respectively.

IC807 detects and processes the chrominance and luminance signals, performs image quality adjustment (color, hue, picture, brightness, and etc). IC807 also converts the signals into RGB signal. The RGB signal is output on pins 19, 21, and 26, and then it’s applied to the LCD

The TFT Controller IC (IC901) controls the horizontal drive and vertical drive for the LCD, and it also performs TFT interface process in response to 1H pulses.

Video signal path output to Video Out jack

The Audio/Video switch (IC201) in the Control unit is responsible of selecting the video signal to be output to the Video Out jack.

It switches between the DVD/CD video signal out of pin 25 of IC802 in the Main board, the VTR1 video signal and the VTR2 video signal. (See Fig. 38 page 45)

The selected signal is output on pin 26 of IC201 and is connected to the Video

Out jack.

43

Back to Text

LCD Video signal path block diagram

IC5 A/V DECODER

124

MAIN

PC B

Q81

VIDEO

OUT

23

CN502

20 2 1

CN701

20 2 1

4

IC201

VIDEO/

AUDIO

S WITCH

SERVO

PC B

1 13 22

CN3

1 13 22

CN801

IC802

VIDEO/AUDIO

S WITCH

DVD VIDEO IN

6

VIDEO OUT

Q806~808

N SYNC IN

4

23

2

2

57

52

Y

C

IC807

VIDEO S IGNAL

PROCES S OR

19 21

26

B G R

CN802

1 11 15 19 30

1 11 15 19 30

CN402

PO W ER

SO URC E

PC B

CN403

1 20 21 22 40

30 11 10 9

B G R

1

CN901

IC 901 TFT

C O NTRO LLER

2 6

8

VTR 1

VTR 2

C O NTRO L

BLO C K

LCD

4

1

6

5

30

22

24

14

CPV

STV

STH

BLUE

GREEN

RED

CN902

MO NITO R

BLO C K

Figure 37

44

Back to Text

Video out jack signal path block diagra m

SERVO

PC B

IC5 A/V DECODER

124

1 13 22

CN3

1 13 22

CN801

N SYNC IN

4

DVD VIDEO IN

IC 802

VIDEO /AUDIO

SW ITC H

6

25

VIDEO OUT

Q816

MAIN

PC B

C O NTRO L

BLO C K

CN502

20 2 1

CN701

20 2 1

6

VIDEO

OUT

Q82

26

2 4

IC201

VIDEO/

AUDIO

S WITCH

VTR 1

VTR 2

Figure 38

45

Audio circuit

Circuit description

W hen the CY-VMD9000U is used by itself (Display Unit and Control Unit), the

Navigation audio is giv en priority when “NAVIGATION” mode is selected.

W hen the CY-VMD9000U is used in combination with the CA-TU7000U or the

C A-TU9000U, the output of the speaker supplied with the CY-VMD9000U is fixed to NAVIGATION Mode (Only th e Navigation audio is output).

CY-VMD9000U only

This unit has 3 different audio outputs (Excluding the Digital Fiber Optic)

The speaker output, designated mainly for Navigation (supplied speaker), the

Pre-amp jacks on the back of the unit, and the VIDEO OUT audio jacks.

If only the CY-VMD9000U (Display Unit and Control Unit) is used, all 3 outputs, the Speaker output, the Pre-amp output, and the VIDEO OUT audio output would output the sound from the selected DVD/CD, VTR1 or VTR2 source.

When a NAVIGATION System is used and the NAV. button is pressed, there won’t be any sound out of the Pre-amp output or the VIDEO OUT audio output and the Navigation audio is given priority through the speaker output.

When only the CY-VMD9000U is used (Display Unit and Control Unit), the

Audio/Video Switch (IC802) selects between the DVD/CD audio signal connected to pin 7 and pin 8, and the VTR1/VTR2 audio signal connected to pin 9 and pin

10.

The selected signal besides being output to the speaker, and the pre-amp jacks in the Display unit, is also output through the Video out audio output jacks in the

Control Unit.

Speaker signal output

Even this output is mainly used to reproduce the Navigation audio; it will also reproduce the DVD/CD, VTR1 and VTR2 audio signals.

The speaker output (pin 15 and pin 16) goes through a mute transistor Q801 and then is fed to the volume control (IC811), which is controlled by the volume clock and volume data generated by the CPU (IC601). (See Fig. 39 page 47)

The output signal is then mixed with a “beep” signal from pin 86 of the CPU and it is then connected to an amplifier (IC801) to be output to the power connector

CN701.

Note: A beep signal will be heard when certain buttons (Volume, Mode, Menu, etc) are pressed. This beep signal is only output through the speaker.

46

Back to Text

Speaker audio block diagram

SERVO

PC B

MAIN

PC B

CN501

6

DV/CD_L

NAV. SP. IN

4 12

3

11

T O 13-PIN DIN

CONNECT OR

7

10

JBOX_R

AOUT

8

DV/CD_ R

9

JBOX_L

IC802

VIDEO/AUDIO

SWITCH

R

CN502

R

1

IC503

AMP.

3

5

7

L

L

1 5 7 8 12 20

1 5 7 8 12 20

CN701

L

L

1

R

7

IC206

AMP.

3

5

C O NTRO L

BLO C K

7

8

R

IC5 A/V DECODER

89 90

1 5 6 22

1 5 6 22

CN3

CN801

Q303

A OUT _L

Q203

15

+

SPEAKER

16

-

Q801

Q802

10

11

2

4

IC808

D/A

CONVERTER

1

IC811

2

SP MUT E

VOL

DAT A

74

61

DV/CD_MUT E

VOL

CLOCK

36 37

86

IC601

CPU

+

BEEP

2

IC801

5

8

-

+

CN701

20 11 10 1

VTR 1

L

9 10

12

11

17

NOUT _L

NOUT _R

18

IC201

A/V

S W

L

19

20

3 5

IC208

AMP.

1

7

VIDEO

OUT

R

R

VTR 2

Figure 39

SPEAKER

47

Pre-amp signal output

This output is selected from the DVD/CD input (pin 7 and pin 8) and the selection between VTR1 and VTR2 from the Control Unit, which is labeled JBOX (pin 9 and pin 10). (See Fig. 40 page 49) The pre-amp signal (Front) is output on pin 19 and pin 20, and it is fed to an amplifier (IC201) and a mute circuit (Q201, Q204,

Q205 and Q301) controlled by the SYS MUTE command from pin 60 of the CPU

(IC601).

The signal is then connected to the pin 5 and pin 7 of the connector CN701 where it is output to the Pre-amp jacks.

This output does not reproduce the Navigation audio, and it is not volume controlled.

Video Out audio output

The Video/Audio switch (IC 201) in the Control Unit is responsible for the selection of the “Video Out” audio output.

It chooses between the DVD/CD audio signal from pin 17 and pin 18 of the audio signal in the Control Unit.

The output signal from of pin 19 and pin 20 of IC201 is fed to an amplifier before it’s output to the “Video Out” audio jacks.

48

Pre-amp output block diagram

Back to Text

SERVO

PC B

MAIN

PC B

DV/CD_L

7 8

DV/CD_R

AOUT

R

1

IC503

AMP.

7

L

R

CN502

3

5

L

10

JBOX_R

9

JBOX_L

IC802

VIDEO/AUDIO

SWITCH

1 5 7 8 12 20

1 5 7 8 12 20

CN701

L

L

1

R

7

IC206

AMP.

3

5

C O NTRO L

BLO C K

7

8 9 10

17

NOUT _L

NOUT _R

18

IC201

A/V

S W

L

19

20

3 5

IC208

AMP.

1 7

VIDEO

OUT

R

Q303

A OUT _L

Q203

Figure 40

R

VTR 2

IC5 A/V DECODER

89 90

1 5 6 22

1 5 6 22

CN3

CN801

R

19

L

FRONT

20

R

R

5

IC201

AMP.

10

L

8

7

Q802

Q201

Q301

MUT E

10

11

2

4

IC808

D/A

CONVERTER

74

DV/CD_MUT E

IC601

CPU

SYS MUT E

60

Q204

Q205

MUT E

DRIVE

SYS

5V

R L

CN701

20 7 5 1

VTR 1

L

PRE-AMP OUTPUT

49

Back to Text

Video Out audio output block diagram

SERVO

PC B

IC5 A/V DECODER

89 90

1 5 6 22

CN3

1 5 6 22

CN801

MAIN

PC B

Q303

A OUT _L

Q203

DV/CD_L

7 8

DV/CD_R

Q802

IC802

VIDEO/AUDIO

SWITCH

17

L

18

R

Q203

Q303

MUT E

14

12

3

IC201

AMP.

1

CN502

L R

1 5 7 8 12 20

1 5 7 8 12 20

CN701

3 5

IC205

AMP.

1

7

R

12

L

11

L

7

IC201

A/V

S W

8

R

19

20

3 5

IC208

AMP.

1

7

C O NTRO L

BLO C K

L

VTR 1

9 10

VIDEO

OUT

R

L

R

VTR 2

10

11

2

4

IC808

D/A

CONVERTER

74

DV/CD_MUT E

IC601

CPU

SYS MUT E

60

Q204

Q205

MUT E

DRIVE

SYS

5V

Figure 41

50

Navigation audio path

The Navigation audio will only be output through the speaker output.

When a Navigation System is connected to the 13-pin DIN connector, a navigation sensor signal is applied to pin 5 of the connector CN503.

This signal is applied to the base of Q505 turning it on. When Q505 is on, a

“LOW” condition is sent to pin 89 of the CPU (IC601). (See Fig. 42 page 52)

When pin 89 of the CPU goes low, the CPU is alerted that a Navigation system is connected to the unit, giving priority to its sound when the “Navigation” button is pressed.

The navigation audio is input to pin 11 and pin 12 of the Video/Audio switch

(IC802), and it is output on pin 15 and pin 16.

DVD/CD audio path

The DVD/CD digital audio signal from the A/V Decoder (IC5) is applied to pin 2 and 4 of the D/A Converter (IC808) where it is converted from digital to analog.

The analog output goes though a mute circuit (Q303, Q203 and Q802) before it is applied to pin 7 and pin 8 of the Video/Audio Switch (IC802).

VTR1/VTR2 audio path

The VTR1 audio signal at pin 7 and pin 8 and the VTR2 audio signal at pin 9 and pin 10 are applied to the Audio/Video Switch (IC201) in the Control Unit.

The selected source is output to two different circuits, one is the “VIDEO OUT” audio jacks in the Control Unit, and the other one is the JBOX audio signal, which is fed to the Video/Audio Switch (IC802) in the Main PCB.

The audio out of pin 19 and pin 20 is fed to an amplifier (IC208), and then it is output to the Video OUT audio jacks.

The audio out of pin 17 and pin 18 is fed first to an amplifier (IC206) in the

Control unit, and then is fed to another amplifier (IC503) in the Main PCB. The output is connected to the J. BOX input of the Video/Audio switch (IC802).

51

Navigation audio block diagram

MAIN

PC B

SYS

5V

CN503

7

5

1

Q505

NAV. SENS

I

2

C CLK

I

2

C DAT A

CN501

6

4

NAV. SP IN

3

T O 13-PIN DIN

CONNECT OR

11

12

21

22

IC802

VIDEO/AUDIO

S WITCH

Q822

Back to Text

15

+

SPEAKER

16

-

Q801

1

IC811

2

AUDIO

10V

SP MUT E

VOL

DAT A

61

23

25

VOL

CLOCK

36 37 86

NAV. SENS

89

IC601

CPU

+

BEEP

2

5

IC801

11

-

+

CN701

20 11 10 1

SPEAKER

Figure 42

52

CY-VMD9000U combined with the Multi Channel AV Control Unit w ith Receiver (CA-TU9000U or CA-TU7000U)

W hen combined with the CA-TU9000U or the CA-TU7000U, the audio path of th e CY-VMD9000U changes. The DVD/CD, VTR1 and VTR2 audio signals are no longer output through the Pre-amp output and the Speaker output. Only the

Navigation audio is output through the speaker output when selected.

The audio is output from the power connector CN701 on the CA-TU9000U to the car’s rear and front speakers, and the “Video Out” audio output jacks .

DVD/CD, VTR1 and VTR2 audio path

The DVD/CD digital audio signal from the A/V Decoder (IC5) is connected to pin

2 and 4 of the D/A Converter (IC808) where it is converted from digital to analog.

The analog output goes though a mute circuit (Q303, Q203 and Q802). then it is applied to pin 7 and pin 8 of the Video/Audio Switch (IC802). (See Fig 43 pg 54)

IC802 sends this audio signal (DVD/CD audio) out on pin17 and pin 18 and feeds it to an amplifier (IC201), a muting circuit (Q203, Q303) in the Main PCB, and then again to another amplifier (IC205) in the Control Unit before it is connected to the Video/Audio Switch (IC201) in the Control Unit.

The VTR1 audio signal is connected to pin7 and pin 8, and the VTR2 audio signal is connected to pin 9 and pin 10 of the Audio/Video Switch (IC201) in the

Control Unit.

IC201 selects between the VTR1, VTR2 and DVD/CD audio signals.

The selected source is output to two different circuits, one is the “VIDEO OUT” audio jacks in the Control Unit, and the other one is the OUT audio signal, which is connected to the Multi Channel AV Control Unit with Receiver (CA-TU9000U) through pin 3 and pin 5 of connector CN702.

53

Audio path block diagram of CY-VMD9000U when combined with

CA-TU9000U

Back to Text

SERVO

PC B

IC5 A/V DECODER

89 90

1 5 6 22

1 5 6 22

CN3

MAIN

PC B

Q303

A OUT _L

CN801

CN501

6

DV/CD_L

NAV. SOUND IN

4

12

7

3

11

TO 13-PIN DIN

CONNECT OR

8

DV/CD_R

IC802

VIDEO/AUDIO

SWITCH

17

L

Q203

Q303

MUT E

18

R

CD

14

12

3

IC201

AMP.

1

15

+

SPEAKER

16

-

Q801

1

IC811

2

+

CN502

L R

1 5 7 8 12 20

Q203

Q802

SP MUT E

VOL

DAT A

10

11

2

4

IC808

D/A

CONVERTER

61

2

IC801

5

8

-

+

20 7 5 1

BEEP

86

IC601

CPU

60

SYS MUT E

SYS

5V

Q204

Q205

MUT E

DRIVE

1 5 7 8 12 20

CN701

3 5

IC205

AMP.

1

7

L

7

8

R

VTR 1

9 10

L

R

VTR 2

SPEAKER

CN702

OUT_L

3

1

5

15

OUT_R

7

IC203

AMP.

3

5

TO CA-TU9000U

R

12

L

11

15

T U_OUT _L

IC201

A/V

S W

16

T U_OUT _R

19

20

VIDEO

OUT

R

VIDEO

OUT

5

3

IC208

AMP.

7

1

C O NTRO L

BLO C K

L

Figure 43

54

Deck Mechanism Operation

The Main CPU (IC601), communicates with the servo CPU (IC4) through the SI data and SO data lines.

Since the Main CPU and the Servo CPU use a different operating voltage level,

IC803 and IC804 are used to keep the TX and RX data lines at each CPU’s operating level.

IC803 converts the SI data line from pin 51 of the Servo CPU (IC4) from 3.5V to

5V before it is connected to pin 75 of the Main CPU.

IC804 converts the SO data line from pin 76 of the Main CPU (IC601) from 5V to

3.5V before it is connected to pin 52 of the Servo CPU (IC4).

Loading/Eject operation

For a step-by-step explanation of the sequence of operations of each mechanical part involved during the loading and eject mode, refers to the Technical Guide order number ACED010631C1

Loading

This unit is capable of playing 2 different types of discs, 5” and 3”. For this reason it uses 3 disc insertion-detecting sensors to detect when a disc is being inserted.

They are positioned in a way that whenever a 3” or 5” disc is being inserted, at least one of them will be covered.

Normally these sensors receive light from the photodiodes on the sensor FPC.

The light from the diodes shines through the 3 holes on the disc guide and hit the surface of the phototransistors Q8, Q9, and Q11 turning them on.

When Q8, Q9 and Q11 are turned on, the voltage on pin 62, pin 63 and pin 64 of the Servo CPU (IC4), goes low. (See Fig. 46 page 57)

When a disc is inserted and the light to any of the sensors is blocked, depending in which of the sensors is blocked, the corresponding pin will go high, at which point the loading command voltage for the motor drive (IC11), will be output on pin 45 of the Servo CPU (IC4).

The motor drive (IC11), will send the drive voltage to the loading motor to load the disc. The loading motor will rotates until the clamp switch closes grounding pin 60 which in term will make pin 45 go low.

55

Eject

When the eject switch (SW158) is pressed, the key1 voltage to pin 91 of the Main

CPU (IC601) changes. This information is passed from the Main CPU to the

Servo CPU (IC4) through the SI data and the SO data lines.

The Servo CPU checks to see if there’s a disc inside of the unit by monitoring the v oltage on pin 60 .

If the voltage on pin 60 is high, the Servo CPU takes no action, but if the voltage is low, it outputs a control voltage on pin 45.

This voltage is applied to pin 9 of the motor drive (IC11) to make the loading motor rotate to eject the disc.

The loading motor will continue to rotate until the disc covers the out sensors, at which time the loading motor will stop.

Note: if after ejecting the disc, it is not removed, the unit will enter the re-load mode repeating the loading proc edure.

Sensor sw itch location

Figure 44

Figure 45

56

Loading/Eject Sensor/Switch block diagram

Back to Text

CN3

20

21

22

1

8

9

70 72

51

SI DATA

52 SO DATA

IC4

CPU

45

65

Q9

64

71

63

Q11

62

SO

SCLK

SI

SW2

Clamp

Switch

60

46

34

R77

3.3K

IC6

SPINDLE

MOTOR DRV

32

33

IC2

DSC

82

R53

39K

R27

10K

IC11

9

MOTOR

DRV

LOADING

Q10 Q8

Q7

SW1

TRV

Switch

R54

39K

3V

LOADING

1 3 8

1 6 8

S PINDLE

MOTOR

LOADING

MOTOR

TRAVERSE

MOTOR

FOCUS

COIL

TRACKING

COIL

1

CN801

8

9

20

21

22

DECK T X

DECK RX

2

IC 803

VO LTAGE

C O NV.

4

DV DATA I

75

4

IC 804

VO LTAGE

C O NV.

2

DV DATA O

76

MAIN

PCB

Figure 46

IC601

CPU

IC701

3V

91

CN803

1

KEY 1

6

14

1

CN151

6

14

SW158

SWITCH

BLOCK

57

58

59

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