SONY MVC-FD85 Training Manual

S®

Digital Camera

Sony Mavica Cameras

Models: MVC-FD85

MVC-FD90 MVC-FD95

Training Manual

MVC-FD85

Troubleshooting & Circuit Descriptions

Course: DSC-01

Table of Contents

Introduction

Common Failures 1

Purpose of this book 1

Electronic Contents of Mavica 1

Circuit Boards Location 2

New Mavica Features 3

MVC-FD80/90 Disassembly 8

Floppy Drive Connections 10

Flash Unit Access 11

Overall Block 13

Power Block 19

AC Power 19

Battery Power 21

Battery Charge Determination 25

Power Block Troubleshooting 29

Flash Operation 31

Discharging the 300V Flash Capacitor 33

Camera Signal Processing 35

Floppy Disc Drive 41

Checking for Floppy Disc Drive Voltage 41

Checking the Floppy Drive Signals 41

Floppy Drive Alignment Check 47

LCD Block 49

Timing Signals 49

LCD Drive Signals 49

Backlight Block 55

On/Off Control 55

Oscillator 57

Start Up 57

Appendix

Using the RM-95 for Adjustments i

Battery Down Adjustment vii

FC-72 Board EEPROM Location xiii

FU Board Replacement xiv

Downloading Radar W Software xv

Using Radar W - Version 2.1 xix

Missing Camera Timing Signals 39

Introduction

The first Sony Mavica consumer still camera was produced in 1996. That early camera was compact and had a flash but did not have zoom. The flash only worked as long as the AC adapter was connected. The pictures were stored in the camera’s internal memory and downloaded to a computer.

The new Mavica cameras are loaded with features and can store pictures in one of three formats:

• Floppy disc

• Memory stick

• Recordable CD (CDR)

The most popular format at this time is the floppy disc because of its versatility. The alternate formats offer increased resolution and more picture storage as we move away from the smaller storage capacity of floppy discs.

Common Failures

Currently the common failures in the floppy disc format Mavica series are limited to:

1. Floppy drive units

2. Flash assembly

3. Lens assembly As time goes on more items will begin to fail, starting with consumer accessible items such as

• Sticky push buttons

• DC-in connectors

• Vanadium-Lithium date/time battery (Located on the back of the

PK50/PK52 board)

• Backlight and LCD panel

Purpose of this book

The purpose of this book is to learn what is involved when repairs get more difficult, enabling you to efficiently complete these repairs. To do this you will need to know the following:

• Precautions from High Voltage

• Normal operation and model features

• How to use the (RM-95 and Radar W) memory access jigs

• Circuit Operation

• Important adjustments

Electronic Contents of Mavica

The MVC-FD85 is the representative model because of its popularity. The MVC-FD90 and MVC-FD95 models are similar except for features. The MVC-FD95 has a different lens assembly and electronic viewfinder so it looks different from the front. Troubleshooting and disassembly are the same for all these popular models.

The main FC-72 board in all three of these models contains a Ball Grid Array (BGA) IC. BGA ICs require expensive equipment and time to replace. To avoid purchasing this equipment, the main board is replaced if found bad. There are other assemblies replaced as a unit. See the chart.

Note that an internal rechargeable date/time battery on the PK board has replaced the traditional date/time coin battery.

Circuitry of the MVC-FD85, 90 and 95 Boards

Board Function Repairable

Lens Zoom, Shutter (iris). No

CD Camera CCD Imager, Steady Shot

sensors (MVC-FD95 only).

PK Pushbuttons, LEDs, Date/Time Batter

LCD & backlight driver, in/out jacks

VF Electronic viewfinder (only in MVCFD95) Yes

FU140/146 DC input, Fuses. Yes

Flash Unit Camera Flash, intensity sensor, self timer

LED.

FC-72

Power, Camera and Floppy Drive Control, Flash control Audio Process. Main board with BGA IC.

HI (human interface) IC

Yes

PK-50 (MVC-FD90) PK-52 (MVC-FD85)

CD-236 (MVC-FD90)

FC-72

MAIN BOARD

FU-140 (MVC-FD90) FU-146 (MVC-FD85)

CD-248 (MVC-FD85)

FLASH UNIT

CIRCUIT BOARDS LOCATION

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New Mavica Features

Since the introduction of the Sony digital still camera in 1996, many features were added to increase flexibility. Although the picture resolution is not as high as 35mm film, digital still cameras offer many desirable features. The Mavica user can take many pictures, share pictures on the Internet, individually process the pictures, and display the pictures on a TV. All these features have allowed the Sony Mavica still cameras to gain worldwide acceptance.

The early consumer digital still cameras were limited in picture capacity by an internal memory. This picture storage limitation was solved when a replaceable floppy disc was used for picture storage and the Mavica became very popular. The next step was a plug-in memory stick that increased the camera’s storage capacity. These floppy disc Mavica still cameras make up the highest sales volume in the digital still camera lineup. The current high-end Mavica stores the pictures on a high capacity writable CD instead of a floppy. This high-end model is not covered in this course.

Features

Some of the features that make the Sony  Mavica popular are: Flash Control

From the rear panel push button you can choose one of four options:

• Normal Flash - A single flash automatically turns ON to illuminate the subject when the brightness is low.

• Red Eye Reduction - Strobes the flash, permitting the subject’s iris to partially close in time for the main picture flash. With the subject’s iris partially closed, the eyes’ internal red sensor cones at the back of the retina are not as evident to the camera. Red eye reduction is not foolproof depending upon the subject’s angle to the camera and the size of the subject’s iris opening in response to the flash.

• Forced Flash - Normal flash comes on regardless of brightness.

• No Flash - Prevents a flash from surprising or annoying someone.

Flash Intensity

You can choose the flash intensity from the menu. A low intensity just illuminates the subject, leaving the background dark. A higher intensity lights a larger, more distant background.

Steady Shot (MVC-FD95 model only)

No more blurred pictures when you move the camera as the capture button is pressed. This feature uses yaw and pitch movement sensors to detect camera movement. If the camera is moved, adjacent pixels from memory are chosen to keep the picture positioned as it was (within the limits of the CCD imager).

Digital Zoom for Sizing the Picture

Optical zoom is accomplished by moving the front lens mechanically toward the subject. After the front lens has reached its mechanical limit, the electronic digital zoom section will expand the picture further, interpolating the active pixels and adding noise correction. Interpolating predicts what brightness/color should be between the active (real) pixels so errors are increased as the digital picture is pursued. If the digital zoom produces poor pictures, it can be inhibited from the user menu and the user can use the optical zoom.

12 Bit A/D Converter for Picture Detail

In the Still or Movie mode, the camera’s CCD imager outputs an analog signal that represents the picture pixel by pixel. The A/D Converter (IC102) that follows measures this analog pixel voltage and converts it into digital words. In the old Mavica cameras, the digital words were 10 bit. A 10 bit Converter will convert the pixel voltage to one of (2

=) 1024 levels. New Mavica cameras use a 12 bit converter. A 12 bit Converter will convert the pixel voltage to one of (2

=) 4096 levels. Therefore a 12 bit Con-

verter has four times the dynamic range as the 10 bit converters (4096 Vs

1024). The result is better picture detail, sharpness and clarity.

Still Picture Quality Selection

Before the picture is taken, the user can use the menu to select the stored picture quality. If a higher quality picture is stored (larger image size), less pictures can be stored:

Product Comparison

Sony Input

Mavica Imager size Max Pic

Model MSRP Focus Zoom / Resolution Size Media 1 Media 2 Media 3 Display

MVC-FD85 $800 Auto 3X Optical 0.37" diagonal / 1280 x Floppy Memory A/V 2.5" LCD

6X Digital 1.3M pixels 960 drive Stick ** 123k pixels

MVC-FD90 $900 Auto + 8X Optical 0.28" diagonal / 1472 x Floppy Memory A/V 2.5" LCD

manual 16X Digital 1.3M/1.6M* pixels 1104 * drive Stick ** 123k pixels

MVC-FD95 $1,100 Auto + 10X Optical 0.37" diagonal / 1600 x Floppy Memory A/V 2.5" LCD

manual 20X Digital 2.1M pixels 1200 drive Stick ** 123k pixels MSRP = Manufacturer’s Suggested Retail Price (List) A/V = Audio and video outputs to a TV. NTSC or PAL can be menu selected. * Interpolated ** Requires optional floppy disc to memory stick adapter MSAC-FD2M.

Power Supply Features:

1 AC Adapter (8.4Vdc output charges batteries in the Mavica camera). 2 DC Info-Lithium 7.2V battery power (one of 2 batteries will fit. The NP-F330 is supplied).

NP-F330 - Battery lasts 70 mins for about 750 pictures. Still pix taken at 5 sec intervals.

NP-F550 - Battery lasts 150 mins for about 1,600 pictures. Still pix taken at 5 sec intervals.

3 Camera Auto powers down (OFF) to save battery power when unused for 3 minutes. 4 Internal vanadium-lithium rechar

eable battery to run clock/date program for 6 months without power input.

Output

Number of Still Pictures Stored

Image Size # pix on floppy # pix on memory stick 1472 x 1104 (MVC-FD90 only - interpolated) 1280 x 960 6 / per floppy 32 / per 8M stick 1024 x 768 10 / per floppy 52 / per 8M stick 640 x 480 30 / per floppy 159 / per 8M stick

5 / per floppy 25 / per 8M stick

Adding Audio to Still Pictures

If Voice is selected in the Menu’s File, Record Mode, five seconds of audio will be added to the picture, but the maximum number of pictures will be reduced. 40 seconds of audio per picture can be recorded if the shutter button is held down.

Instant Still Picture Check

After the picture is taken, pressing the left side of the control button permits the user to review the last picture. They have the choice of keeping or deleting the picture by pressing this button to make the selection.

Cropping / Trimming

In the PLAY Mode, a portion of a still picture can be expanded to create a new picture. The Zoom control sizes the picture while the control button positions the new picture. Pressing the shutter button records the new cropped picture.

ReSizing the Picture

If a smaller size picture file is required because of limited storage space or because of transmission bandwidth limitations, the picture can be resized. In the PLAY Mode find the picture you want to resize, then open the TOOL Menu to access the ReSize feature. Select the new size desired and the new picture is created. The original picture remains intact.

Text Picture Record Mode

This still picture mode takes pictures in Black and White. Unlike the normal black and white picture mode, the text mode has no gray areas in the picture, only black or white. The advantage to using this mode is that more pictures can be stored.

Comparison of Pictures Stored in Normal and Text Mode

Image Size Selected Pictures Stored Text Pictures Stored

1280 x 960 5 (25) 7 (40) 1024 x 768 6 (32) 11 (61)

640 x 480 30 (159) 54 (160)

floppy disc (memory stick)

The disadvantage is that if the user sets this mode, pictures will have no color until the user enters the record mode to cancel this feature.

E Mail Picture Record Mode

The menu’s FILE/Record Mode, E-Mail selection permits the camera to record a low-resolution (320 x 240 pixel) image at the same time the high quality picture is taken. The E-Mail images are stored in a newly created “E-Mail” folder on the disc.

Moving images in the Movie Mode

Unlike previous Mavica cameras, the MVC-FD85, 90 and 95 can play back moving pictures and sound. The minimum recording time is set from the menu so when you press the shutter button even momentarily the recording continues for the selected interval. The default minimum time is five seconds but can be changed to 10 or 15 seconds. If you hold the shutter button down, the recording will continue until you release the button or will continue for the maximum time allocated in the picture size you selected. One of two picture sizes (picture resolution) is selected in the Movie Mode by the Menu under FILE, Image Size. The resolution is comparable to the E-Mail picture resolution at best and is not designed to replace a camcorder.

Maximum Movie Mode Recording Time

Recording Time

Menu File Image Size

(Picture Resolution)

320 x 240 15 seconds. 85 seconds.

160 x 112 60 seconds. 5 mins, 45 seconds.

Floppy Disc 8MB Memory Stick

Flash Control

Flash Intensity

Mavica Features

Steady Shot (MVC-FD95 only)

Digital Zoom

12 Bit A/D Converter for detail

Still Picture Quality - User Selection

Add Audio to Still Pictures

Instant Still Picture Check

Cropping / Trimming

ReSizing the Picture

Text Picture Mode

E Mail Picture Mode

Moving Pictures in the Movie Mode

Slide Show in the Play Mode

A/V Output in NTSC or PAL

LCD BACK LIGHT

VOL

PLAY MOVIE

STILL

FOCUS

FLASH MENU

PLA Y:

STILL:

MOVI E:

INDEX

__MINS

PANEL

PROG

MENUS

DELETE

EFFECT

LCD

DISPLAY

FIL E

640

TOOL

CAMERA

PWR

PICTURE RESOLUTION

PWR = GRN CHARG E = AMBER

MVC-F D85 BACK PANEL

SETUP

Slide Show in the Play Mode

This feature displays all the still pictures taken one by one. You can select the time the picture remains visible before the next picture is selected. The intervals are 3, 5, 10, 30 or 60 seconds. Repeat can also be selected. Access this feature from the PLAY Mode. Select File using the Menu and enter Slide Show to select the picture interval. Press the center of the Control button to start the show.

A/V Outputs

A 3.5mm jack on the side of the Mavica outputs NTSC or PAL video and analog audio to a TV for viewing on a larger screen. The video format is selected from the Menu under SetUp/Video Out.

The video output format does not change the LCD picture, the jpeg still picture or Mpeg movie format on the disc or memory stick. If the user sets the output format to the PAL mode, when he later tries to use the A/ V output, the TV will show a skewed dark picture with diagonal lines even though the LCD panel displays a perfect picture. The sound is OK if enabled.

Screw (M2x4),

Cabinet (front)

Two screws (M2x4),

Two screws (M2x4)

Cabinet (rear)

Screw (M2x4),

MVC-FD80/90/95 DISASSEMBLY 1

Two screws (M2x4),

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AC IN

AC POWER ADAPTOR

FU-140 board (MVC-FD90) FU-146 board (MVC-FD85)

FC-82 board

Lens block assembly (MVC-FD90)

Lens block assembly (MVC-FD85)

CD-248 board

CD-246 board

Cold cathode fluroescent tube (20p)

MVC-FD90

FC-72 board

Lens block assembly (24P)

MVC-FD80/90/95 DISASSEMBLY 2

PK-52 board (MVC-FD85) PK-50 board (MVC-FD90)

Liquid crystal module indicator (24p)

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Cabinet (front) block assembly

Flexible board (18P) (MVC-FD85 FP-231) (MVC-FD90 FP-167)

Lens block assembly (MVC-FD85 (26P) (MVC-FD90 (24P)

FU-91 harness (12p)

Microphone unit (2p)

Flash unit (10p)

Control switch block (MF330)(6p) (MVC-FD90)

FU-52 harness (9p)

Blind sheet

Floppy disk drive (4 x)

Claw

FC Bracket

Three screws

(M2 x 2.5)

FC-72 board

MVC-FD90

Lens block assembly (26P)

FC-72 board

FLOPPY DRIVE CONNECTIONS

Four screws (M2 x 2.5)

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Two tapping

screws (M2 x 5)

ST insulating sheet

FU-140 board (MVC-FD90

FU-146 board (MVC-FD85)

Two tapping

screws (M2 x 5)

Flash unit

Short jig resistor 1k, 1W (Part No. 1-215-869-11)

FLASH UNIT ACCESS

When handling the flash unit, be sure to discharge the charging capacitor before handling it. For discharge, short the positive (+) and negative (-) terminals of the charging capacitor for about ten seconds

Control switch block (6p)

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NOTES

Overall Block

The circuit makeup of the Mavica Still Picture Camera consists of the power supply and several sections necessary to display a picture on the LCD panel and store the picture onto a 3.5” floppy disc. The main FC-72 board is fed by power input from the FU board. Meanwhile, the FC-72 board supports several stages and assemblies.

• Camera stage

• Flash unit assembly

• Floppy disc assembly

• LCD stage

• LCD Backlight stage

The main FC-72 board is not repairable because it contains a BGA IC. If this board is bad, the entire board is replaced.

Power Supply

All camera features function whether powered by an AC adapter or the Info-Lithium Ion battery. When the battery is used, two transistor switches are used to connect the battery to the main power path.

Battery Power

When an Info-Lithium Battery is inserted, HI Control (Human Interface Control) IC404 receives Ever 3.2V power and determines that the power source is the battery. The “Batt Unreg” line passes about 7.2Vdc battery power from the FU board to the FC-72 board. This line is applied to IC404 for battery sensing and D401 to make Ever 3.2V that powers IC404. D401 feeds regulator IC401 that outputs the Ever 3.2V. This Ever 3.2V is used to power IC404 and charge the timer backup battery BT701 (via D410). With IC404 powered, it looks at its Batt Unreg input from F004 to identify the power source.

Powering the camera from the battery employs the Fast Charge On circuit of Q001 and Q004. Sliding the power switch (key input buttons) instructs IC404 to output a HIGH from the Fast Charge On line. This HIGH turns ON Q001 and Q004 on the FU board. Q001 and Q004 connect the battery voltage to the fuses F001-3 and F005, which apply power to the DC-DC Converter IC001. The converter produces voltages for the camera.

AC Adapter Power

The AC adapter (not shown) produces about 8.4Vdc (1.5A capacity) to the DC In terminals of the FU board. This DC input is fused before entering the power supply on the main FC-72 board to power IC404 and the camera’s DC-DC Converter. Within the main board, D402 directs this input voltage from F003 to Regulator IC401. IC401 makes the Ever 3.2V to power HI Control (Human Interface Control) IC404 and to keep the BT701 battery charged (via D410). Now that IC404 is powered, it detects that the power is supplied from F003 that comes from the AC adapter.

Battery Charging

Conditions - Battery charging can only take place when both power sources are present and the camera is OFF. Before battery charging is initiated, a test charge using Q001 and Q004 is performed to determine if charging is necessary. This test charge occurs when the battery is inserted or when the camera is turned off (so the battery charge conditions are just met).

Battery Charging Conditions

Name Purpose Location

Batt Unreg Battery presence From F004

BL Unreg AC Adapter presence From F003

Power OFF Power OFF Internal IC404 on/off latch

A good way to determine the condition of the battery is to measure the voltage and discharge current with a controlled load. A more efficient way is to measure the voltage and current during a test charge. A test charge is an ideal way to check the condition of the battery.

Operation - IC404 outputs pulses from “Init Charge On” to turn ON transistors Q002 and Q003. The DC In voltage passes through D002 and the two transistors to test charge the battery. The battery’s microprocessor determines if charging is needed and sends data on the “S” line to inform IC404. If charging is needed, IC404 outputs a HIGH on the FAST CHARGE ON line to connect the battery to the DC In voltage.

IRIS

CONTROL

MICRO

LENS

ASSY.

BATT.SIG.

BATT.UNREG.

Q002,

Q003

D002

FU BD.

FLASH

UNIT

ASSEMBLY

CCD

IMAGER

CD BD.

H&V

SHIFT

PULSES

F004

FAST CHARGE ON

Q001,

Q004

F001

F002

F005

IC404 STB

CHARGE

STB FULL

STRB ON

CCD OUT

ACCESS

TIMING GEN.

INIT.CHARGE ON

F003

FC-72 BD.

PROCESS

DISC

IC501

MC CAM

IC101

D401

D402

IC102 IC301

CAMERA

SYS DD

IC404

Hi CONT.

IC001 DC-DC CONV.

IC901

VIDEO

PROCESS

IC702, IC704

FLOPPY DRIVER

XCS PANEL D/A

HI SCK, HI SO

KEY AD 1,2 POWER

SW.MODE SW.SHUTTER

RTS

SCK,SIO

Vdd

EVER 3.2V

IC401

REG.

CAMERA

PANEL

FLOPPY

Y,R-Y,B-Y,H,V

IC252, IC253

AUDIO

PROCESS

R/WA,B SPINDLE,

TRACK DRIVE

PANEL 4.9V

BL UNREG.

IC405 TIMER

CLOCK

R485

D410

VOLTAGES

Vdd

BATT.

IC901, IC904

LCD DRIVER

TIMING GEN.

VIDEO OUTPUT

TO OUTPUT JACK

J781

SPEAKER/ MIC

FLOPPY

DISC

ASSEMBLY

IC902

EVR

BACKLIGHT

P.S.

KEY INPUT

BUTTONS

BT701

BACK-UP

PK BD.

LCD

PANEL

BACK

LIGHT

OVERALL BLOCK

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Back Up Battery Power

The back up battery located on the rear panel PK board powers the timer Clock IC405 to keep the clock alive for about six months if no power is applied. This battery is recharged whenever either power source is connected because of the OR configured D401 and D402 diodes on the FC72 board.

Camera Stage

The camera stage consists of the lens assembly, CCD imager, and circuitry on the main FU-72 board. The main board circuits process the signal for the LCD panel and for storage on the floppy disc. Additional circuits control the iris, focus and zoom motors (not shown) in the lens assembly.

At power ON, but only in the Still or Movie modes when the camera is used, is when the iris motor opens to pass light through the lens onto the CCD imager. The imager consists of thousands of phototransistors that translate each pixel of incoming light into a voltage. With the aid of horizontal and vertical voltage shift pulses from the timing generator IC101, the CCD imager can output voltages that represent each pixel of the picture.

Within the main FC-72 board, IC102 and IC301 process the CCD imager output signal. Its output feeds the audio and video processor (IC252, IC253 and IC901) for picture and sound. The serial bus output of IC301 feeds Camera Mechanism Control IC501 for iris and focus motor control. IC501 examines the picture brightness to adjust the iris motor and examines the signal’s high frequency detail to adjust the focus motor. After IC501 makes the determination, it instructs EVR (electronic variable resistor - not shown) IC186 to output a DC voltage that drives the corresponding motor.

Flash Unit Assembly

The flash unit is not repairable and is replaced as an assembly. It is triggered ON with a wide positive pulse at STRB ON or a series of narrow positive pulses if red eye reduction is selected. When the shutter button is pressed, HI Control IC404 informs IC501. If IC501 determines the flash is needed, it instructs IC301 to produce positive pulse(s) on the STRB ON line into the flash assembly.

In addition to the STRB ON line, the flash assembly capacitor needs to be charged to produce the flash of light for picture taking. IC404 controls the charge function and indication using two controls lines.

Flash Control

Name From Purpose Voltage

STB Charge IC404 Runs the Charge osc High = charging

STB Full Flash Unit Stops the Charge osc

nal. Turns on the

si flash indicator light.

When power is turned on in a camera mode (Still or Movie), IC404 brings STB Charge line into the flash unit HIGH. This turns on the charge oscillator in the flash unit. When the charge oscillator has charged the flash capacitor to 300Vdc, the flash unit outputs a LOW going pulse on the STB Full line to IC404. IC404 discontinues the positive voltage at the STB Charge line and turns on the amber flash OK LED indicator inside the flash button.

Low going pulse

Floppy Disc Assembly

The floppy disc assembly is also not repairable and replaced as an assembly. The assembly consists of two read/write heads (A and B), a spindle motor to turn the disc, and a track stepping motor and feeler switches to detect if a disc is present and if it is write protected. At power ON if a disc is detected, the stepper motor moves to the initial position just before the disc spins. The information is read from the disc from heads A and B.

LCD Stage

The LCD panel is operational in all three modes (Play, Still or Movie). R, G, B signals form a picture, supported by V and H sync from IC301 on the main FC-72 board. The panel RGB signals are modified by LCD Driver IC901 to set brightness, contrast and color level. The resultant output signal is applied to the LCD unit.

The vertical and horizontal sync signals are applied to a timing generator IC904. IC904 develops pulses for the LCD unit to locate the pixel group that is applied the R, G or B signal.

IRIS

CONTROL

MICRO

LENS

ASSY.

BATT.SIG.

BATT.UNREG.

Q002,

Q003

D002

FU BD.

FLASH

UNIT

ASSEMBLY

CCD

IMAGER

CD BD.

H&V

SHIFT

PULSES

F004

FAST CHARGE ON

Q001,

Q004

F001

F002

F005

IC404 STB

CHARGE

STB FULL

STRB ON

CCD OUT

ACCESS

TIMING GEN.

INIT.CHARGE ON

F003

FC-72 BD.

PROCESS

DISC

IC501

MC CAM

IC101

D401

D402

IC102 IC301

CAMERA

SYS DD

IC404

Hi CONT.

IC001 DC-DC CONV.

IC901

VIDEO

PROCESS

IC702, IC704

FLOPPY DRIVER

XCS PANEL D/A

HI SCK, HI SO

KEY AD 1,2 POWER

SW.MODE SW.SHUTTER

RTS

SCK,SIO

Vdd

EVER 3.2V

IC401

REG.

CAMERA

PANEL

FLOPPY

Y,R-Y,B-Y,H,V

IC252, IC253

AUDIO

PROCESS

R/WA,B SPINDLE,

TRACK DRIVE

PANEL 4.9V

BL UNREG.

IC405 TIMER

CLOCK

R485

D410

VOLTAGES

Vdd

BATT.

IC901, IC904

LCD DRIVER

TIMING GEN.

VIDEO OUTPUT

TO OUTPUT JACK

J781

SPEAKER/ MIC

FLOPPY

DISC

ASSEMBLY

IC902

EVR

BACKLIGHT

P.S.

KEY INPUT

BUTTONS

BT701

BACK-UP

PK BD.

LCD

PANEL

BACK

LIGHT

OVERALL BLOCK

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LCD Backlight Stage

The backlight is necessary for the LCD unit’s visibility or it will appear almost black. The backlight circuit is powered by the BL Unreg line from F003, but is switched by the LCD Backlight ON/OFF switch at the rear panel to conserve battery power. The backlight switch works by informing IC404. IC404 sends a chip select pulse (XCS Panel D/A) accompanied by serial data (HI SO) to EVR IC902. IC902 outputs a BL Level to the backlight power supply to switch it ON or OFF. When the power supply turns ON, 750Vp-p (92kHz) is applied to the fluorescent backlight tube. To insure starting at low ambient light levels, a nearby LED is also turned ON (not shown).

IRIS

CONTROL

MICRO

LENS

ASSY.

BATT.SIG.

BATT.UNREG.

Q002,

Q003

D002

FU BD.

FLASH

UNIT

ASSEMBLY

CCD

IMAGER

CD BD.

H&V

SHIFT

PULSES

F004

FAST CHARGE ON

Q001,

Q004

F001

F002

F005

IC404 STB

CHARGE

STB FULL

STRB ON

CCD OUT

ACCESS

TIMING GEN.

INIT.CHARGE ON

F003

FC-72 BD.

PROCESS

DISC

IC501

MC CAM

IC101

D401

D402

IC102 IC301

CAMERA

SYS DD

IC404

Hi CONT.

IC001 DC-DC CONV.

IC901

VIDEO

PROCESS

IC702, IC704

FLOPPY DRIVER

XCS PANEL D/A

HI SCK, HI SO

KEY AD 1,2 POWER

SW.MODE SW.SHUTTER

RTS

SCK,SIO

Vdd

EVER 3.2V

IC401

REG.

CAMERA

PANEL

FLOPPY

Y,R-Y,B-Y,H,V

IC252, IC253

AUDIO

PROCESS

R/WA,B SPINDLE,

TRACK DRIVE

PANEL 4.9V

BL UNREG.

IC405 TIMER

CLOCK

R485

D410

VOLTAGES

Vdd

BATT.

IC901, IC904

LCD DRIVER

TIMING GEN.

VIDEO OUTPUT

TO OUTPUT JACK

J781

SPEAKER/ MIC

FLOPPY

DISC

ASSEMBLY

IC902

EVR

BACKLIGHT

P.S.

KEY INPUT

BUTTONS

BT701

BACK-UP

PK BD.

LCD

PANEL

BACK

LIGHT

OVERALL BLOCK

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1 sec

Power Block

The power block consists of three sections with inter-functional operations:

Power Block Functions

Name Function

1. AC Power AC power only

2. Battery Power Battery power. Battery Charge

3. Battery Charge Determination

Charge or not to charge

(Evaluation made when the battery is first connected and again when the camera is turned off). Needs AC power.

AC Power

The main power path for this camera is AC power from the DC In J902. When this power plug is inserted several operations occur:

1. HI Control IC404 is powered

2. AC adapter input is detected

3. Battery Charge Determination signal is output

4. Battery is inhibited if connected

HI Control IC404 is powered

When the AC adapter is connected, 8.4V regulated DC is input to a bank of fuses on the FU board. The voltage continues into the main FC-72 board for the power supply, Ever 3.2V regulator IC401 and out of the board into the backlight power supply.

Voltage from F005 is used to power IC404. This voltage is applied through D402 to Ever 3.2V regulator IC401. IC401 powers HI Control IC404.

AC adapter input is detected

Once IC404 is powered, it detects the presence of the AC power source at pin 72.

Battery Charge Determination signal is output

Once IC404 knows there is an AC power source, IC404 begins outputting battery charge determining pulses at pin 27 even though there is no battery connected. The signal is a one second duration square wave that starts at 0V and goes to 3.2V.

Battery is inhibited if connected

When the AC adapter plug is inserted into the camera, the battery is inhibited from powering the camera because it is assumed AC power is available. The AC adapter plug has a broad negative contact that connects the DC In J902/pin 3 to pin 2 (ground).

Grounding J902/pin 3 brings IC404/pin 20 Low so IC404 will not connect the battery to the main camera circuit when the camera is ON. IC404 would normally connect the battery using pins 27 or 100 (not shown in this diagram).

Service Position

The FU board is fully accessible while the camera is operational in the PLAY mode.

1. Remove the rear panel.

2. Unplug the two lower left ribbon connectors from the main FC-72 board. This disables the camera lens but frees the main board.

3. Lift the Floppy drive with main board up and fold the rear panel above it so there are three panels. The FU board is in the front panel.

Rear Panel

Service Position

Floppy Drive

Front Panel

upside down

FU Board

J902

DC IN

1 2

AC-L10

ADAPTER

R001

ADAPTER PLUG = 0V

NO ADAPTER PLUG = 3V

BATTERY

DC IN

FU BD.

FROM BATTERY

DC IN

Q001

D703

PWR

PL BD.

Q001, Q004

TEST

CHARGE

DRIVE

Q001, Q004

F003

F002

F001

F005

S703

POWER

R713

27 24

32 19

8 2

6 4

CN001/

CN004

VOLTAGE

CN701/

CN801

CN003/

CN002

FC-72 BD.

BL UNREG.

TO BACK LIGHT

DRIVE (PK BD.)

4.9V CAM

FDD SPIN

ACV

D401

D402

BATT.

SEN

A 4.9V

R488

3V = BATTERY OP.

(NO CHARGING)

0V = AC OPERATION

1 SEC

IC401 3.2V

3V 0V

REG.

EVER 3.2V

Hi CONT.

BATT.

EXT.

R495

100k

POWER

SUPPLY

SOURCE

IC404

EVER

3.2V

DD ON

INITIAL CHARGE ON

CAMERA VOLTAGES

A 4.9V FDD 4.9V FDD P 5V LCD PANEL VOLTAGES

FC-72 BD.

CN001 CN002

IC802

CN801

XTAL

IC404

AC POWER

21DSC1 1316

3/14/01

Battery Power

The battery power circuit is used to power the camera when the camera is turned ON and also used to charge the battery when the camera is OFF.

Battery Power Circuit Applications

Conditions Purpose Key Signal

No AC adapter. Battery inserted. Camera is

AC adapter connected. Battery not charged. Camera is

AC adapter connected. Battery is fully charged. Camera is

OFF

Power the Camera (no AC adapter)

When the battery is connected to power the camera, the battery voltage must be detected and switched into the camera power path before the camera will work.

After the battery is inserted, the following takes place:

• Battery Powers IC404

• IC404 Detects the Battery only

• IC404 Completes the Battery Path

• Battery power is available to the Camera

Battery Powers IC404

Inserting any power source powers IC404. Sliding the NP-F330 or NPF550 battery into the compartment applies its 7.2Vdc to F004. This 1.4A fuse passes the battery voltage into the main FC-72 board. D401 and D402 are connected as an OR gate to pass either the battery or DC In voltage. The higher voltage is applied to the Ever 3.2V regulator IC401. IC401’s output powers main HI Control IC404.

Power the camera

Charge the battery

Test Charge the battery

IC404/pin 100 output is HIGH.

IC404/pin 100 output is 1 sec square wave.

IC404 Detects the Battery Only

Now that the Active Ever 3.2V line powers HI Control IC404, it detects battery voltage at pin 71 from F004 with the camera still off. IC404’s next step is dependent upon whether the AC power is detected at pin 72. If both voltages at pins 71 and 72 are present, battery charging begins. If only the battery is present, IC404 completes the battery power path to power the camera.

IC404 Completes the Battery Power Path

The final step is for IC404 to switch on Q001 and Q004 when the camera is powered ON. These transistors will divert the battery voltage into the camera’s power supply via fuses F001, F002, F003 and F005 (some fuses are not shown for simplicity).

When the camera is turned ON with the battery alone detected, IC404 outputs a High at pin 100. This control voltage enters the FU board to turn on N channel MOSFET Q004. The 3.2V from IC404/pin 100 is reduced by R006 to 1.6V at Q004’s gate. The positive gate voltage turns on the N channel device so it conducts. The resultant 0V at Q004’s Drain is applied to the gates of P channel Q001, also turning them both ON. When Q001 conducts, its D-S resistance drops, causing the battery voltage to be connected through the fuse line into the camera’s power supply.

Although power is now presented to the power supply, the power supply needs a DD ON signal from IC404 to produce the voltages necessary to turn ON the camera.

Battery Power Checklist

Test Point Voltage Purpose

Floppy Drive case 0Vdc Ground point

CN001/pin 8 7.2V Battery voltage Input to Main

FC-72 board

CN001/pin 3 3.2V

Q004/Drain 0Vdc Proves Q004 is OK

Fuses (except F004) 7.2Vdc Proves Q001 is OK

Batter FC-72 board

On Switch Output from



BATTERY INFO.

LITHIUM

NP-F 330/

NP-F 550

MICRO

DC IN

J902

FU BD.

BATTERY

CONN.J901

BATT.EXT. IC404/20

(FC-72 BD.)

Q001 1/2

R001

CN002

7.2V

Q004

Q005/G

CHARGE

INHIBIT

7.2V D

D001

7.2V

R002

Q001

C001

1.6V

CHARGE ON

R006

DATA

0V = BATT./NO BATT. 3V = CAR CORD

TEST CORD

FU BD.

F001

F005

2/2

F004

FAST

3.2V

CN004/

CN001

CN003/

CN002

POWER SUPPLY

D402

IC401

REG.

D401

BATT. SENS

FC-72 BD.

3.2V

100

OUTPUT

VOLTAGES

(SWITCH)

EVER

3.2V

SOURCE

IC404

Hi CONT.

Q409

CN001 CN002

CN802

654948

R472 1M

FC-72 BD.

DD ON

BATT./

EXT.

J902/3

EVER

3.2V

XTAL

CN001 DC IN

CN002

BATT.

BATTERY POWER

CN801

22DSC1 1317

IC404

3/14/01

Battery Compartment Switch

The switch in the battery compartment, J901, remains grounded with or without a battery inserted. This switch only opens when the car battery cord or battery down adjustment test cord is inserted.

The switch permits the camera to operate with a special non-Info-Lithium power source. As a precaution, battery charging is inhibited when this switch is open.

Defective Switch Symptoms

If the switch is open (defective) there will be no battery life information on the camera’s display and the battery cannot be charged because IC404 does not expect an Info-Lithium battery to be present.

Charge the battery (with AC adapter)

This Battery Power circuit permits the battery to power the camera when the camera is turned ON. However when the camera is turned OFF, this Battery Power circuit works in exactly the same way to charge the battery. The Battery Charging operation occurs under the following conditions:

1. The AC adapter must be connected.

2. A battery must be connected.

3. The camera must be OFF.

4. The Battery Charge Determination Circuit must determine if the battery needs charging after a test charge.

5. This Battery Power Circuit turns ON to charge the battery.

6. The battery’s microprocessor informs IC404 to stop the charge when the battery is charged.

Test Charging the Fully Charged Battery

After the battery is charged, the rear panel amber charge light goes out. This circuit changes to test charge the battery while the camera is still OFF. IC404 changes from outputting a HIGH at pin 100 for battery charging to a one-second square wave to test charge the battery. This momentarily connects the DC In voltage to the battery at a one-second rate, keeping the battery charged. During this time the battery’s micro can also determine if battery charging is necessary and informs IC404 if the battery should switch back to the charging mode.

A dynamic battery test method can be performed by either placing a load on the battery (measure the current flowing out) or by test charging the battery (measure the current flowing in). This dynamic test method is better than just measuring the battery terminal voltage to determine if charging is needed.

IC404/pin 100 Output Voltage (CN002/pin 3)

Power Camera OFF Camera ON

AC only 0Vdc 0Vdc

Battery Only 0Vdc 3.2Vdc

AC + Battery 3.2Vdc (charging amber light is

on)

AC + Battery (fully charged battery)

Square wave 1 sec On / 1 sec Off duty cycle (charged battery amber light is off) *

0Vdc

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