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S
®
Training Manual
Digital Camera
Sony Mavica Cameras
Models: MVC-FD85 MVC-FD90 MVC-FD95
MVC-FD85
Troubleshooting & Circuit Descriptions Course: DSC-01
Table of Contents
Introduction
Common Failures Purpose of this book Electronic Contents of Mavica Circuit Boards Location 1 1 1 2
Floppy Disc Drive
Checking for Floppy Disc Drive Voltage Checking the Floppy Drive Signals Floppy Drive Alignment Check
41
41 41 47
LCD Block
Timing Signals LCD Drive Signals
49
49 49
New Mavica Features MVC-FD80/90 Disassembly
Floppy Drive Connections Flash Unit Access
3 8
10 11
Backlight Block
On/Off Control Oscillator Start Up
55
55 57 57
Overall Block Power Block
AC Power
13 19
19
Appendix
Using the RM-95 for Adjustments Battery Down Adjustment FC-72 Board EEPROM Location FU Board Replacement Downloading Radar W Software Using Radar W - Version 2.1 i vii xiii xiv xv xix
Battery Power Battery Charge Determination Power Block Troubleshooting Flash Operation Discharging the 300V Flash Capacitor Camera Signal Processing
Missing Camera Timing Signals
21 25 29 31 33 35
39
1
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.
· · · · ·
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 Lens CD PK VF FU140/146 Flash Unit FC-72 Function Zoom, Shutter (iris). Camera CCD Imager, Steady sensors (MVC-FD95 only). Repairable No Shot Yes
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
Pushbuttons, LEDs, Date/Time Battery, Yes LCD & backlight driver, in/out jacks Electronic viewfinder (only in MVCFD95) DC input, Fuses. Yes Yes
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:
Camera Flash, intensity sensor, self timer No LED. Power, Camera and Floppy Drive Control, No Flash control, HI (human interface) IC, Audio Process. Main board with BGA IC.
PK-50 (MVC-FD90) PK-52 (MVC-FD85)
CD-236 (MVC-FD90)
FU-140 (MVC-FD90) FU-146 (MVC-FD85)
CD-248 (MVC-FD85)
FLASH UNIT
FC-72 MAIN BOARD
CIRCUIT BOARDS LOCATION
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3
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.
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 10 =) 1024 levels. New Mavica cameras use a 12 bit converter. A 12 bit Converter will convert the pixel voltage to one of (2 12 =) 4096 levels. Therefore a 12 bit Converter 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:
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.
Product Comparison Sony Mavica Model MVC-FD85 Input Imager size / Resolution 0.37" diagonal / 1.3M pixels 0.28" diagonal / 1.3M/1.6M* pixels Output Max Pic Size 1280 x 960 1472 x 1104 * Media 1 Floppy drive Floppy drive Media 2 Memory Stick ** Memory Stick ** Media 3 A/V Display 2.5" LCD 123k pixels 2.5" LCD 123k pixels 2.5" LCD 123k pixels
MSRP
Focus
Zoom 3X Optical 6X Digital
$800 Auto
MVC-FD90
$900 Auto + 8X Optical manual 16X Digital
A/V
MVC-FD95
$1,100 Auto + 10X Optical 0.37" diagonal / 1600 x Floppy Memory manual 20X Digital 2.1M pixels 1200 drive Stick ** 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.
A/V
1 2
3 4
Power Supply Features: AC Adapter (8.4Vdc output charges batteries in the Mavica camera). 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. Camera Auto powers down (OFF) to save battery power when unused for 3 minutes. Internal vanadium-lithium rechargeable battery to run clock/date program for 6 months without power input.
4
5
Number of Still Pictures Stored Image Size # pix on floppy # pix on memory stick 1472 x 1104 (MVC-FD90 5 / per floppy 25 / per 8M stick 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
Comparison of Pictures Stored in Normal and Text Mode Image Size Selected 1280 x 960 1024 x 768 640 x 480 Pictures Stored 5 (25) 6 (32) 30 (159) floppy disc (memory stick) Text Pictures Stored 7 (40) 11 (61) 54 (160)
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. 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 240 160 x 112 Floppy Disc 15 seconds. 60 seconds. 8MB Memory Stick 85 seconds. 5 mins, 45 seconds.
Mavica Features
Flash Control Flash Intensity 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 - +
__MINS 640 LCD PANEL
PICTURE RESOLUTION
ON
S PLAY MOVIE PWR
PWR = GRN CHARGE = AMBER
STILL PROG FOCUS FLASH MENUS PLAY: STILL: MOVIE: INDEX DELETE EFFECT EFFECT FILE FILE FILE TOOL CAMERA CAMERA SETUP SETUP SETUP DISPLAY MENU
MVC-FD85 BACK PANEL
6
7
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.
7 Cabinet (front) 5 Two screws (M2x4),
3 Two screws (M2x4)
F B o C -7 ar 2 d
a
4 Screw (M2x4),
6 Cabinet (rear)
2 Screw (M2x4), 1 Two screws (M2x4),
MVC-FD80/90/95 DISASSEMBLY 1
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9
AC IN
AC POWER ADAPTOR
FU-140 board (MVC-FD90) FU-146 board (MVC-FD85)
FC-82 board
CD-246 board
PK-52 board (MVC-FD85) PK-50 board (MVC-FD90) Liquid crystal module indicator (24p)
Lens block assembly (MVC-FD90) CD-248 board Lens block assembly (MVC-FD85) MVC-FD90 Cold cathode fluroescent tube (20p)
FC-72 board Lens block assembly (24P)
MVC-FD80/90/95 DISASSEMBLY 2
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9 FU-91 harness (12p) 8 FU-52 harness (9p) 1 Microphone unit (2p)
10 Flash unit (10p) 11 Cabinet (front)
block assembly
14 Blind sheet
15 Floppy disk drive (4 x) 2 Flexible board (18P)
(MVC-FD85 FP-231) (MVC-FD90 FP-167)
3 Lens block assembly
6 Claw 13 FC Bracket 12 Three screws
(MVC-FD85 (26P) (MVC-FD90 (24P)
(M2 x 2.5)
7 FC-72 board
4 Control switch block (MF330)(6p)
(MVC-FD90)
5 Four screws (M2 x 2.5)
MVC-FD90 FC-72 board Lens block assembly (26P)
FLOPPY DRIVE CONNECTIONS
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11
2 Two tapping screws (M2 x 5) 1 ST insulating sheet 6 FU-140 board (MVC-FD90 FU-146 board (MVC-FD85) 5 Two tapping screws (M2 x 5)
3 Flash unit
4 Control switch block (6p)
Short jig resistor 1k, 1W (Part No. 1-215-869-11) 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
FLASH UNIT ACCESS
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NOTES
12
13
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.
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).
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.
Battery Charging Conditions Name Batt Unreg BL Unreg Power OFF Purpose Battery presence AC Adapter presence Power OFF Location From F004 From F003 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.
FLASH UNIT ASSEMBLY LENS ASSY. IRIS CONTROL CCD IMAGER CD BD. H&V SHIFT PULSES
IC404 STB CHARGE STB FULL
Y,R-Y,B-Y,H,V IC102 IC301 CAMERA PROCESS IC901 VIDEO PROCESS
LCD IC901, IC904 PANEL LCD DRIVER TIMING GEN. VIDEO OUTPUT TO OUTPUT JACK J781 SPEAKER/ MIC FLOPPY DISC ASSEMBLY IC902 EVR BACK BACKLIGHT LIGHT P.S. KEY INPUT BUTTONS
STRB ON CCD OUT
IC252, IC253 AUDIO PROCESS
DISC ACCESS IC501 MC CAM IC101 TIMING GEN.
IC702, IC704 FLOPPY DRIVER
R/WA,B SPINDLE, TRACK DRIVE
XCS PANEL D/A HI SCK, HI SO
PANEL 4.9V BL UNREG.
MICRO S
BATT.SIG.
+
BATT.UNREG. F004 INIT.CHARGE ON FAST CHARGE ON Q001, Q004 F003 F001 F002 F005 FU BD. FC-72 BD. IC404 Hi CONT.
KEY AD 1,2 POWER SW.MODE SW.SHUTTER IC405 TIMER CLOCK R485 Vdd BATT.
-
Q002, Q003
RTS SCK,SIO Vdd D410
D002 DC IN
D401 D402
SYS DD ON
EVER 3.2V
IC401 REG. CAMERA PANEL FLOPPY VOLTAGES
BT701 BACK-UP
IC001 DC-DC CONV.
PK BD.
OVERALL BLOCK
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15
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. 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 STB Charge STB Full From IC404 Flash Unit Purpose Runs the Charge osc Voltage High = charging
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.
Stops the Charge osc Low going pulse signal. Turns on the 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.
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.
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.
FLASH UNIT ASSEMBLY LENS ASSY. IRIS CONTROL CCD IMAGER CD BD. H&V SHIFT PULSES
IC404 STB CHARGE STB FULL
Y,R-Y,B-Y,H,V IC102 IC301 CAMERA PROCESS IC901 VIDEO PROCESS
LCD IC901, IC904 PANEL LCD DRIVER TIMING GEN. VIDEO OUTPUT TO OUTPUT JACK J781 SPEAKER/ MIC FLOPPY DISC ASSEMBLY IC902 EVR BACK BACKLIGHT LIGHT P.S. KEY INPUT BUTTONS
STRB ON CCD OUT
IC252, IC253 AUDIO PROCESS
DISC ACCESS IC501 MC CAM IC101 TIMING GEN.
IC702, IC704 FLOPPY DRIVER
R/WA,B SPINDLE, TRACK DRIVE
XCS PANEL D/A HI SCK, HI SO
PANEL 4.9V BL UNREG.
MICRO S
BATT.SIG.
+
BATT.UNREG. F004 INIT.CHARGE ON FAST CHARGE ON Q001, Q004 F003 F001 F002 F005 FU BD. FC-72 BD. IC404 Hi CONT.
KEY AD 1,2 POWER SW.MODE SW.SHUTTER IC405 TIMER CLOCK R485 Vdd BATT.
-
Q002, Q003
RTS SCK,SIO Vdd D410
D002 DC IN
D401 D402
SYS DD ON
EVER 3.2V
IC401 REG. CAMERA PANEL FLOPPY VOLTAGES
BT701 BACK-UP
IC001 DC-DC CONV.
PK BD.
OVERALL BLOCK
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17 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).
FLASH UNIT ASSEMBLY LENS ASSY. IRIS CONTROL CCD IMAGER CD BD. H&V SHIFT PULSES
IC404 STB CHARGE STB FULL
Y,R-Y,B-Y,H,V IC102 IC301 CAMERA PROCESS IC901 VIDEO PROCESS
LCD IC901, IC904 PANEL LCD DRIVER TIMING GEN. VIDEO OUTPUT TO OUTPUT JACK J781 SPEAKER/ MIC FLOPPY DISC ASSEMBLY IC902 EVR BACK BACKLIGHT LIGHT P.S. KEY INPUT BUTTONS
STRB ON CCD OUT
IC252, IC253 AUDIO PROCESS
DISC ACCESS IC501 MC CAM IC101 TIMING GEN.
IC702, IC704 FLOPPY DRIVER
R/WA,B SPINDLE, TRACK DRIVE
XCS PANEL D/A HI SCK, HI SO
PANEL 4.9V BL UNREG.
MICRO S
BATT.SIG.
+
BATT.UNREG. F004 INIT.CHARGE ON FAST CHARGE ON Q001, Q004 F003 F001 F002 F005 FU BD. FC-72 BD. IC404 Hi CONT.
KEY AD 1,2 POWER SW.MODE SW.SHUTTER IC405 TIMER CLOCK R485 Vdd BATT.
-
Q002, Q003
RTS SCK,SIO Vdd D410
D002 DC IN
D401 D402
SYS DD ON
EVER 3.2V
IC401 REG. CAMERA PANEL FLOPPY VOLTAGES
BT701 BACK-UP
IC001 DC-DC CONV.
PK BD.
OVERALL BLOCK
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19
Power Block
The power block consists of three sections with inter-functional operations:
Power Block Functions Name 1. AC Power 2. Battery Power 3. Battery Charge Determination AC power only Battery power. Battery Charge Charge or not to charge (Evaluation made when the battery is first connected and again when the camera is turned off). Needs AC power. Function
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.
1 sec
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).
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. 2. 3. 4. HI Control IC404 is powered AC adapter input is detected Battery Charge Determination signal is output Battery is inhibited if connected
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
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.
Service Position
Floppy Drive
upside down
Front Panel
FU Board
FU BD. J902 DC IN
1 2 3
FC-72 BD. CN001/ CN004
6 7 6 5 4 7 8
FROM BATTERY Q001, Q004 F003 F002 F001
BL UNREG. TO BACK LIGHT DRIVE (PK BD.) 4.9V CAM POWER SUPPLY
9
10 3
AC-L10 ADAPTER R001 1k DC IN Q001
F005
11 2 12 1
FDD SPIN D401 BATT. VOLTAGE ACV SEN D402 IC401 3.2V REG. EVER 3.2V SOURCE
72 14 60
CAMERA VOLTAGES A 4.9V FDD 4.9V FDD P 5V LCD PANEL VOLTAGES DD ON
S703 POWER
CN701/ CN801
27 24 38 13
IC404 Hi CONT.
20 27
FC-72 BD. CN001 IC802 1
1
D703 PWR ADAPTER PLUG = 0V NO ADAPTER PLUG = 3V PL BD.
CN002 XTAL
R713
32 19
A 4.9V CN003/ CN002
8 2
R488 1k
BATT. EXT. EVER 3.2V INITIAL CHARGE ON CN801 IC404
BATTERY DC IN
Q001, Q004 TEST CHARGE DRIVE
3V = BATTERY OP. R495 (NO CHARGING) 100k 0V = AC OPERATION
6 4
3V 0V 1 SEC
AC POWER
21DSC1 1316
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21
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 No AC adapter. Battery inserted. Camera is ON AC adapter connected. Battery not charged. Camera is OFF AC adapter connected. Battery is fully charged. Camera is OFF Purpose Power the camera Charge the battery Test Charge the battery Key Signal IC404/pin 100 output is HIGH. 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
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.
Test Point Floppy Drive case CN001/pin 8 CN001/pin 3 Q004/Drain Fuses (except F004)
Voltage 0Vdc 7.2V 3.2V 0Vdc 7.2Vdc
Purpose Ground point Battery voltage Input to Main FC-72 board Battery On Switch Output from FC-72 board Proves Q004 is OK Proves Q001 is OK
BATT.EXT. IC404/20 (FC-72 BD.)
1
CN004/ CN001
10 3
DC IN J902 BATTERY INFO. LITHIUM NP-F 330/ NP-F 550 R + + MICRO -
2 3
Q001 1/2 R001 1k
7.2V D P D001
F001
11 2 12 1
POWER SUPPLY D402 IC401 3.2V REG. D401
OUTPUT VOLTAGES (SWITCH) EVER 3.2V SOURCE
72
DD ON BATT./ EXT. J902/3
F005
7.2V R002 Q001 P 2/2
20
+
BATTERY CONN.J901 S
CN002
1
7.2V 0V Q004 D N S
D
F004
5 8 71
IC404 Hi CONT. 100
48 49 65
BATT. C001 FAST CN003/ SENS CHARGE ON CN002
7 3
0V Q409 EVER 3.2V R472 1M FC-72 BD.
2 4
1.6V R006 3.2V 1M 9 1 DATA
5 5
FU BD.
1 1
3
Q005/G CHARGE INHIBIT
0V = BATT./NO BATT. 3V = CAR CORD TEST CORD FU BD. FC-72 BD.
CN001 CN802 1
1
CN002 XTAL
CN001 CN002 DC IN BATT.
CN801 IC404
BATTERY POWER
22DSC1 1317
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23
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.
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 AC only Battery Only AC + Battery AC + Battery (fully charged battery) 0Vdc 0Vdc 3.2Vdc (charging on) amber light is Camera OFF Camera ON 0Vdc 3.2Vdc 0Vdc 0Vdc
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. 2. 3. 4. The AC adapter must be connected. A battery must be connected. The camera must be OFF. 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.
Square wave 1 sec On / 1 sec Off duty cycle (charged battery amber light is off) *
BATT.EXT. IC404/20 (FC-72 BD.)
1
CN004/ CN001
10 3
DC IN J902 BATTERY INFO. LITHIUM NP-F 330/ NP-F 550 R + + MICRO -
2 3
Q001 1/2 R001 1k
7.2V D P D001
F001
11 2 12 1
POWER SUPPLY D402 IC401 3.2V REG. D401
OUTPUT VOLTAGES (SWITCH) EVER 3.2V SOURCE
72
DD ON BATT./ EXT. J902/3
F005
7.2V R002 Q001 P 2/2
20
+
BATTERY CONN.J901 S
CN002
1
7.2V 0V Q004 D N S
D
F004
5 8 71
IC404 Hi CONT. 100
48 49 65
BATT. C001 FAST CN003/ SENS CHARGE ON CN002
7 3
0V Q409 EVER 3.2V R472 1M FC-72 BD.
2 4
1.6V R006 3.2V 1M 9 1 DATA
5 5
FU BD.
1 1
3
Q005/G CHARGE INHIBIT
0V = BATT./NO BATT. 3V = CAR CORD TEST CORD FU BD. FC-72 BD.
CN001 CN802 1
1
CN002 XTAL
CN001 CN002 DC IN BATT.
CN801 IC404
BATTERY POWER
22DSC1 1317
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25
Battery Charge Determination
This circuit test charges the battery to determine if charging is needed. Test charge pulses are produced when the AC adapter is plugged in and the camera is off. The test charge pulses stop when a battery is inserted to complete the test. The Battery Charging operation begins when the first three conditions are met: 1. 2. 3. 4. 5. 6. 7. 8. 9. The AC adapter plug is connected and supplying DC In voltage. The battery is inserted. The Camera is OFF. This Battery Charge Determination circuit test charges the battery. This Battery Charge Determination circuit disconnects. The amber Battery Charge light turns ON (not shown.) Battery Charging comes from Q001. Battery Charging ends. Battery Charge Inhibit
The Camera is OFF
Battery charging only works when both power sources are connected and IC404 has determined that the camera is off.
This Battery Charge Determination circuit test charges the battery
IC404/pin 27 (CN002/pin 4) will output a one-second square wave until the battery's charge condition is determined. This square wave momentarily charges the battery so the battery's microprocessor can determine if a charge is needed. If a charge is needed, the battery's microprocessor informs IC404 and IC404 starts the charging. The square wave from IC404/pin 27 is applied to Q003 to simulate the battery charging. When Q003 turns ON, so does Q002. Q002 is connected between the DC In jack and the battery jack so when Q002 conducts, current flows through D002 into the battery during these one-second test charges. During one or two of these one-second test charges, the battery's micro can determine if charging is needed and relay that information as data from J901/pin 2 to IC404/pin 48. This occurs right after the battery is inserted or the camera is turned off.
The AC adapter plug is connected and supplying DC In voltage
When the AC Adapter plug is inserted, J902/pin 3 is grounded at the jack by the plug. This ground is applied to HI Control IC404 to inhibit the battery from operating the camera as long as the DC In plug is connected. Voltage from the AC adapter passes through F005 and is detected by AC sense input of IC404/pin 72. This causes IC404 to output pulses at onesecond intervals from pin 27 (CN002/pin 4). These pulses will be used in step 4 to test charge the battery.
This Battery Charge Determination Circuit disconnects
In the previous test charge, when the battery was inserted or the camera was turned off, IC404 determined if the battery needed charging or not. IC404 will take one of two courses of action: No charge needed Continue to test charge the battery at one-second intervals with pulses from IC404/pin 100 using the battery power circuit. Charging needed Charge by outputting a steady high from IC404/pin 100 using the battery power circuit. In either case, the one-second pulses from this battery determination circuit will no longer output IC404/pin 27.
The Battery is inserted
After the battery is inserted, IC404/pin 71 (via F004) senses its voltage. The switch in the camera's J901 compartment is normally closed (J901/ pin 3 = ground) for IC404 to expect data from an Info-Lithium battery. The data is used to turn on and shut off the charge circuits.
FU BD. BATT.EXT. IC404/20 (FC-72 BD.) F001
1 2 11 2
FC-72 BD. CN004/ CN001
10 3
DC IN J902 AC-L10 ADAPTER BATTERY INFO. LITHIUM NP-F 330/ NP-F 550 R + + 4
+
POWER SUPPLY D402 IC401 3.2V REG. D401 BATT. SENS
OUTPUT VOLTAGES (SWITCH) EVER 3.2V SOURCE
72
DD ON BATT./ EXT. J902/3
AC ONLY
R020 10 R001 1k Q002 D002 CN002 N Q003 P
F005 R004 = AC ONLY 8.4V = AC+BATT. 0.6V = BATT. ONLY
12 1
3
20
+
BATTERY CONN.J901 MICRO S
IC404 Hi CONT.
71 27 48 49 65
1
5
8
DATA IC404/48,49 (FC-72BD.)
2
F004 D S R019 47k
6 4
INITIAL CHARGE ON
0V Q409 EVER 3.2V R472 1M FC72 BD. CN001 CN802 1
1
N Q005 CHARGE INHIBIT
DATA CN002/2 (FU BD.)
5 5
-
3
AC ONLY FU BD.
1 1
INITIAL CHARGE ON 1 SEC. BATT.ON = 0V CHARGING = 0V
CN003/ CN002
0V = BATT./NO BATT. 3V = CAR CORD TEST CORD
CN002 XTAL
CN001 CN002 DC IN BATT.
CN801 IC404
BATTERY CHARGE DETERMINATION
23DSC1 1318
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26
27 The Amber Battery Charge Light Turns ON (not shown)
If charging is called for, the one-second pulses from IC404/pin 27 stop and the amber charge light is lit. The charge light circuit is not shown.
IC404/pin 27 Output Voltage (CN002/pin 4) Power AC only Battery Only AC + Battery AC + Battery Camera OFF Square wave 1 sec. On / 1 sec. Off duty cycle 0Vdc 0Vdc (charging amber light is on) amber light 0Vdc (charged battery is off) * Camera ON 3.2Vdc 0Vdc 3.2Vdc 3.2Vdc
Battery Charging comes from Q001 (not shown)
If battery charging is called for, IC404/pin 100 goes high to charge the battery. The High turns on Q004 and bi-directional Q001 to connect the DC In and Battery positive terminals as described in the Battery Power section of this book. Charging ends when the battery's microprocessor informs IC404 to stop charging.
Battery Charge Inhibit
Q005 is normally OFF (not active) with or without a battery. If the car battery cable is connected, Q005 turns ON to ground out the one-second pulses into Q003. This grounds the battery test charge signal and therefore the battery from charging.
* Test charging after the battery is charged is performed by an alternate square wave signal that outputs IC404/pin 100 (Battery Power circuit).
FU BD. BATT.EXT. IC404/20 (FC-72 BD.) F001
1 2 11 2
FC-72 BD. CN004/ CN001
10 3
DC IN J902 AC-L10 ADAPTER BATTERY INFO. LITHIUM NP-F 330/ NP-F 550 R + + 4
+
POWER SUPPLY D402 IC401 3.2V REG. D401 BATT. SENS
OUTPUT VOLTAGES (SWITCH) EVER 3.2V SOURCE
72
DD ON BATT./ EXT. J902/3
AC ONLY
R020 10 R001 1k Q002 D002 CN002 N Q003 P
F005 R004 = AC ONLY 8.4V = AC+BATT. 0.6V = BATT. ONLY
12 1
3
20
+
BATTERY CONN.J901 MICRO S
IC404 Hi CONT.
71 27 48 49 65
1
5
8
DATA IC404/48,49 (FC-72BD.)
2
F004 D S R019 47k
6 4
INITIAL CHARGE ON
0V Q409 EVER 3.2V R472 1M FC72 BD. CN001 CN802 1
1
N Q005 CHARGE INHIBIT
DATA CN002/2 (FU BD.)
5 5
-
3
AC ONLY FU BD.
1 1
INITIAL CHARGE ON 1 SEC. BATT.ON = 0V CHARGING = 0V
CN003/ CN002
0V = BATT./NO BATT. 3V = CAR CORD TEST CORD
CN002 XTAL
CN001 CN002 DC IN BATT.
CN801 IC404
BATTERY CHARGE DETERMINATION
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29
Power Block Troubleshooting
No Power ON
1. No response to the power ON switch with any power source. An open fuse, bad power switch or a defect on the FU board can cause the problem. Before opening the unit, connect the AC adapter and power up the unit using the RM-95 Remote Commander. You can use the RM-95 to force the Mavica ON in the Play, Still or Movie Modes. See "Using the RM-95..." (table of contents) for the procedure. If you can power the Mavica ON with the RM-95, the normal power ON button input signal is not reaching IC404/pin 14 on the FC board. If the Mavica does not power ON with the RM-95, open the rear panel and check the fuses by looking for input voltage on the top right connector CN001/pins 1-8 of the FC-72 board (service manual - frame diagram section 4-1). Pin 1 is on the right. 2. Mavica only works with the AC adapter - not with a good InfoLithium battery. Either fuse F004 is open, Q001 / Q004 are bad or the Fast Charge ON signal from the FC-72 board is missing. Check F004 by looking for battery voltage at the top of the FC-72 board at CN001/pin 8. Next slide the power ON switch and look for 3.2Vdc at the Fast Charge ON signal output CN002/pin 3. If this voltage is missing, the problem is on the FC-72 board. If this voltage is present, replace Q001 and Q004 on the FU board. 3. Camera Shuts Down after Powering On. The main microprocessor HI Control IC404 needs to be reset or the battery down information in one of the EEPROMs is corrupt, causing premature shutdown. Reset the microprocessor by removing the back panel and releasing its flex cable from the main FC-72 board. Reconnect the flex cable after four seconds. Unplugging the cable disconnects the rechargeable coin battery on the rear panel from the micro on the main board so the micro can fully reset when full power is next applied.
Perform the battery down adjustment as outlined in both this training manual and the service manual. The camera does not have to be taken apart, but a power supply, DVM, the RM-95 adjustment tool, and a special power cord are needed.
NO Battery Charging.
1. AC adapter and Battery are plugged in but the amber charge light does not come on. One of the power sources is missing or is not detected by IC404 on the FC-72 board. First make sure the camera operates with AC and battery power individually. That checks the fuses at the hard to get to FU140/146 board. If one of these power sources does not work, you can measure the AC and battery sensing voltage input to IC404 at the top of the FC-72 board, CN001 connector, pins 1 (AC) and 8 (battery). If the main board input voltages at CN001/pins 1 and 8 are present, unplug the battery and look for a 1-second pulse output from the FC72 main board at CN002/pin 4. This pulse is amplified by Q003 on the FU board and should appear at its collector as an 8Vp-p signal unless Q003 or charge inhibit Q005 is shorted. This signal is amplified again and can be seen at the battery jack J901/pin 1 where 8.4Vdc is used to test charge the battery (when inserted). From this point it is up to the micro in the battery to send charge needed or no charge needed data to IC404. If no charge is needed or the battery voltage is too low (defective), IC404 will not turn on the charge light. No battery charging could theoretically occur if the battery jack J901 switch is open. The additional symptom is no battery time display. 2. The amber charge light comes ON but the battery does not charge. Just because the amber charge light comes ON does not mean the charge signal from IC404 is going to completion. The charge light signal and charge signal come from different IC404 ports. Check the charge signal (3.2Vdc) from the top of the FC-72 board at CN002/pin 3. If this charge signal is present, the main board is OK. Suspect Q004, Q001 or the battery itself.
1
CN001 R020 10 R001 Q002 1k P D002
DC IN
F003 F002
CN004/CN001 BL UNREG. TO BACKLIGHT DRIVE (PK52/5O BD.) A4.9V 7 6 7 CAMERA VOLTAGES 8 5 POWER FDD 4.9V 4.9 CAM 9 4 SUPPLY FDD P5V 10 3 LCD PANELVOLTAGES FDD SPIN 11 2 LCD ON 12 1 SYS.ON D402 CAM.ON D401 5 8 2 IC401 3.2v ACV SENS CN003/CN002 REG
6 7
DC IN J902
2 3
R004 Q001/ Q004
F001 F005 F004
BATTERY BATT/ EXT. TERM. J901 TO IC404/20
+ S 1 2
BATT.SIG. BATT.UNREG. TO CN003/9 4 5 5 DC IC404/48,49 DC PACK G ADAPT. SW. 3 R005 S D INITIAL CN002 N Q005 CHARGE ON FU BD. 6 4 FU140/146 BD. N R019 1 1 7 3 47k Q003 FAST CHARGE ON CN001 CN002 PK50/52 BD. D703 POWER D702 CHARGE
37 14 38 13 27 24 32 19 25 26
BATT. SENS
27
R472 1M
65
EVER 3.2V SOURCE Q409 BUFF BATT. EXT. BATT.SIG. CN002/2
100
19
A4.9V EVER 3.2V
SI 48 IC404 SO 49 Hi CONTROL
20 94 60 14 80
FC-72 BD. CN002 XTAL
CHARGE POWER
S703 POWER ENTER ON S709 BACK LIGHT OFF S705 FLASH
CN001 CN802 1 EVER 1 3.2V D410
LEFT
35 16
CN801 IC404 R270 FC-72 BD. IC405 TIMER/ CLOCK
+
-
CONTROL BUTTON
1
50
BT701
3V
CN701/ CN801
POWER BLOCK
10DSC1 1308
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31
Flash Operation
Before touching the Flash unit, you must discharge the large 300Volt Flash Capacitor. This is explained in the next section. The flash unit and the interfacing FC-72 flash control boards are each replaced as an assembly. The following questions and answers will quickly explain what is required for the flash operation. The answers will allow you to determine which board is causing the flash problem.
How does the shutter button trigger the flash?
After the shutter button is pressed, the flash command is sent as data through IC501 to IC301. Along with the flash command is a user decision to force a flash or strobe the flash. IC301 monitors the light level from the CCD imager signal and determines if a flash is required. IC301 outputs a long duration single pulse to initiate a single full flash (normal) or short duration pulses for strobe flashes preceding the full flash. These Strb On flash pulse(s) from IC301 on the FC-72 board (CN301/pin 9) are used to trigger the flash unit. The Strb On pulses can be observed with a scope.
When will the flash go OFF?
The flash will go off if the following conditions are met: · · · · · Mavica is in the Still picture taking (not Play or Movie) mode. Flash is enabled by the user (LCD does not have the symbol of a lightning bolt circled with a diagonal line through it). Insufficient brightness from the CCD imager (camera section). Flash LED (middle of flash button) is lit meaning the flash capacitor is charged. Shutter button is pressed.
What are the voltages at the flash unit connector?
Flash Unit connector voltages CN301 1 2* Signal STB Charge STRB Photo On Pop Up On A 4.9V Gnd Photo Tr Out Tally LED Unreg STRB On XSTB Full Purpose Cap charge signal from FC board. 0V= stop charge, 3V = charge cap. HIGH from IC301 (FC-72 board) during the flash cycle. Goes to 3V when shutter is pressed. Returns to 0V when cap is charged again. Flash unit output pulse at the conclusion of the flash. B+ to flash unit Ground Feedback voltage to control STRB On pulse width (flash intensity). In the Self-Timer Mode, this LED control goes LOW when the shutter button triggers the timer to flash. Flash Capacitor Oscillator power + Pulse fires flash. Pulse width sets intensity Low Pulse from flash unit to stop STB charge signal (CN301/pin 1). ready to flash state Voltage 0V. 0V
How do I know the flash capacitor is charged?
When the flash is not disabled (active), HI Control IC404/pin 93 outputs a HIGH (3.2Vdc as STB Charge) along CN301/pin 1 to the flash unit assembly. This turns ON the charge oscillator within that charges its flash capacitor. When the capacitor in the flash unit charges to the 300V threshold, a pulse is output along CN301/pin 10 (XSTB Full) back to IC404 so IC404 knows the flash unit is ready to fire. IC404 lights D701 inside the flash button to tell the technician the capacitor is charged and to tell the user the flash is ready/enabled. IC404 also lowers the STB Charge voltage to stop the oscillator.
3* 4 5 6* 7*
0V 5Vdc 0V 0V 3.68Vdc. (0V = timer counting.) 8Vdc 0V. + Pulse fires flash 2.9Vdc
What commands are needed to fire the flash?
Flash Command Name Shutter button Strb ON FC-72 Bd Location CN002/pin 8 CN301/pin 9 Ready voltage 3.2Vdc 0Vdc Flash voltage 0Vdc + Pulse(s) 8 9 10
* Cannot inhibit the flash
PK52/PK50 BD.
FC-72 BD.
LOW PULSE = CAP CHARGED
32
CN301 4 A4.9V XSTB FULL
1
ST UNREG. 4.9V CHARGE OSC. FLASH STRB CAPACITOR PHOTO ON STRB ON FLASH STROBE
10
33 18
56 93
STB CHARGE H = CHARGE FLASH CYCLE
FLASH LED D701
IC404 Hi CONTROL
35 16 80
R
2
S705 FLASH
CN701/ CN801
LOCK
17 16
SW.
CN002/ 9 8 CN003 CN005 S001 SHUTTER
1 2
IC301/ IC501 CAMERA CONTROL
9
LCD 1 2 BLANK CAPTURE AC UNREG. F001 CN004/ CN001
11 2
6
PHOTO TR. OUT CAMERA BUS
8
FLASH TUBE PHOTO TRANSISTOR
CONTROL SW.BLOCK FU146/140 BD.
ST UNREG.
FLASH UNIT
FLASH OPERATION
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33
Discharging the 300V Flash Capacitor
The flash unit contains the flash tube, flash capacitor and phototransistor for flash monitoring. For your own safety, you must dis-
charge the flash capacitor before working near the flash unit board.
Discharge Procedure: 1. Turn ON the camera. 2. The LCD will show one of four flash conditions at the upper left corner of the LCD. · Auto = no indication. = eye symbol · Red Eye Reduction = · Forced Flash = = lightning symbol = "NO" circle with the lightning symbol centered. · No Flash = 3. At the camera's rear panel press the Flash button until NO flash is inhibited. The red flash LED will darken and the flash unit's capacitor charge oscillator will stop. 4. Turn OFF the camera and disassemble it to access the flash unit to bleed off the residual charge with a 1k ohm, 1-watt resistor. 5. Grasp the body of the resistor (without touching both leads) and hold the resistor leads to the flash capacitor terminals. 6. Disconnect the resistor after 10 seconds.
Flash Unit
1k ohm 1 watt Touch the discharge resistor to capacitor terminals and hold for 10 seconds
+
Flash Capacitor
NOTES
34
35
Camera Signal Processing
Camera Modes of Operation:
All three operating modes use the LCD and Floppy Drive but not the camera and audio sections. Operating Sections
Mode Play Still Movie X X X Camera Speaker X Mic
V1-V4
-7.5V
15V
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
CCD Imager
CCD Output
H1, H2, PG
In the Play Mode, all DC voltages and signals to the CCD imager go to 0V. (no camera operation).
Camera Operation
When the Still or Movie modes are selected, the Iris motor in the lens assembly is driven open, allowing light to fall upon the CCD imager. This imager is an IC containing thousands of phototransistors. Each phototransistor converts its portion of received light into electricity. Each phototransistor is covered with one of three transparent colored films. The colored film permits each voltage output to be in one of three groups. Later in the FC-72 board, the three groups of voltages are matrixed to produce a color picture. The output of the CCD imager consists of the voltages from each phototransistor. The CCD imager requires vertical, horizontal and gate input pulses to output each voltage. All of these pulses come from the timing generator on the FC-72 board. The horizontal (H1, H2) and gate pulses (RG) are required to step each row of voltages out of the CCD imager (CCD Out). After the row has exited, the remaining rows of voltages are shifted down to the exit row using four sets of vertical pulses (V1-V4).
CCD Output
When each phototransistor voltage is output in series at high speed, the voltages form a shape that corresponds to the brightness of the picture. This CCD Output signal was taken of color bars from a light box. The digitally captured waveform does not show the detail of the colors as your scope would. The two gaps in the waveform corresponds to the vertical interval at the top or bottom of the picture.
V Out
CCD Output - Color Bars (light box) Name Location Voltage V Out Imager IC201/pin 8 1.4Vp-p Time Base = 5 msec/div
V OUT
CN201/ CN101
13 9 8
VL
-7.5V VDD 15V
7 8 17
-7.5V +15V CCD OUTPUT
Q202 BUFF. LIGHT IC101/IC102 CCD IMAGER
5 6 4 2 3 1 15 16 14
IC102 SAMPLE/HOLD AGC, A/D CONV.
IC301CAMERA DSP
V1A V1B V2 V3A V3B V4 H1 H2 RG
10 9 11 13 12 14 4 5 3
IC101 TIMING GENERATOR
FU-72 BD.
CD BD. X101 24.5MHz PAL X102 24.3MHz NTSC
CAMERA PROCESS
15DSC1 1312
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37
When the lens is covered so the picture is dark, no voltage from the phototransistors is output. The signal carrier pulses (RG) equivalent to a clock signal is the only information on the CCD Output line.
0.3Vp-p V Out
1 T
Horizontal Timing Signals Location Voltage H1 Imager IC201/pin 15 3Vp-p H2 Imager IC201/pin 16 4Vp-p RG Imager IC201/pin 14 3Vp-p Time Base = 20 usec/div Name
Vertical Input Pulses
There are six vertical timing pulses required to shift the rows of voltages down toward the exit row. Keep in mind that the extra-tall voltage spike on the odd numbered V1A and V3A signals are necessary to complete the shift. These spikes are supported by the +15Vdc input. The remainder of the signal is below the 0V baseline (supported by the 7.5Vdc power source).
PKD C H 1 500m V~ M T B 5 .0 0 m s- 1 .8 0 d v c h 1 -
CCD Output - Lens Covered Name Location Voltage V Out Imager IC201/pin 8 0.3Vp-p Time Base = 5 msec/div
Horizontal Pulses
There are two horizontal pulses and one RG pulse that are used to clock or transfer the voltages out the CCD imager. One RG pulse carries one phototransistor voltage so this frequency is as high as the pixel density of the CCD imager. The gaps in the H waveforms correspond to the horizontal blanking interval at the right or left sides of the picture.
T
0
V1A V1B
1
2
0 0
V2
3
C H 1 ! 1 0 .0 V =
H1
T 1
C H 2 ! 5 .0 0 V =
H2
2
RG
C 1!2.00 V H = 3 C 2!2.00 V H = C 3!2.00 V C P M B2 H ~ H T 0.0us- 1.86dv ch1+
Vertical Timing Signals - 1 Location Voltage V1A Imager IC201/pin 5 22Vp-p V1B Imager IC201/pin 6 7Vp-p V2 Imager IC201/pin 4 7Vp-p Time Base = 20usec/div Name
0V
T
V3A
1
V3B
2
V4
3 C H 1 !1 0 .0 V = C H 2 !5 .0 0 V = C H 3 !5 .0 0 V ~ C H P M T B 2 0 .0 u s- 1 .86 d v c h 1 +
Vertical Timing Signals - 2 Name Location Voltage V3A Imager IC201/pin 2 22Vp-p V3B Imager IC201/pin 3 7Vp-p V4 Imager IC201/pin 1 7Vp-p Time Base = 20 usec/div
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Missing Camera Timing Signals
Normal picture of a B and W star chart used in camcorder focus adjustments. The Color bars are at the top background.
Missing V2 Timing signal to imager/pin 4 Description: Total loss of vertical signal transfer. Only the last line is output because the horizontal timing pulses are present.
Missing V1A Timing signal to imager/pin 5 Description: Total loss of vertical signal transfer. Only the last line is output because the horizontal timing pulses are present. The picture consists of purple, dark red (crimson) and black lines
Missing V3A Timing signal to imager/pin2 Description: Some vertical lines were not transferred out of the imager (missing). This causes black lines to appear in the picture.
Missing V3B Timing signal to imager/pin 3 Description: Total loss of vertical signal transfer. Only the last line is output because the horizontal timing pulses are present. The picture consists of purple, dark red (crimson) and black lines.
Missing H2 Timing signal to imager/pin 16 Description: One of the two horizontal signals used to carry the CCD voltages (charges) out of the imager is missing. Black and crimson diagonal lines are the result.
Missing V4 Timing signal to imager/pin 1 Description: Loss of vertical timing signal produces vertical lines in the crimson/black picture.
Missing RG Output Clock pulse to imager/pin 14 Description: The RG pulse clocks the CCD output signal from the imager. When RG is absent, there is no CCD output (black screen).
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Floppy Disc Drive
The camera's main FC-72 board contains the signal processing and motor control circuitry for the Floppy Drive Assembly. When the floppy drive fails to play the disc, the problem can be the fuse, the floppy drive, or the main board. The Floppy disc Drive is replaced as an assembly. The main board is also replaced as an assembly. The fastest way to determine if the drive, fuse (F001 on the FU board) or main board is bad is to check the supply voltage. If the supply voltage is good, substitute the floppy drive unit. If another drive unit is not available, the last resort is to check for signals from the main board.
Knowing how the floppy drive normally behaves and checking for motor drive signals to the floppy drive is almost as good as substituting the floppy drive unit itself. The input/output head signal is too low to be seen on a scope so they cannot be used for testing.
Normal Operation
At power ON, HI Control IC404 (not shown) measures the voltage at the drive's disc in switch. 0V means the LCD panel will show "No Disk". If there is voltage present, a disc is in the drive and IC404 will begin reading the disc in a process that begins when the spindle motor starts.
Voltage at CN701/pin 19 No Disc Disc in drive 0Vdc 4.4Vdc
Checking for Floppy Disc Drive Voltage
CN701/pin 1
FC-72 Board
The following occurs when a disc is detected: 1. Disc In switch causes CN701/pin 19 to rise from 0V to 4.4V. 2. The Spindle motor is driven and the Disk Access lights. 3. The Stepper motor is driven so its heads are moved to the initial outer track 00. 4. The Disc TOC is read and loaded into memory. 5. The stepper motor is moved inward to read the last picture data (Play mode) or goes to an unused area of the disc (Still/Movie Mode). 6. After the data is read the: · Spindle motor stops · LED goes out
Testing for Drive voltage on the main FC-72 board
+5V from F001 to drive unit
Checking the Floppy Drive Signals
Some of the symptoms of a bad floppy drive are: 1. "Disc Error" or "File Error" 2. C:13:01 also disc error 3. After taking a picture, the picture is only partially displayed or half gray (read/write heads break off - possibly from rapid disc insertion). 4 If the read/write heads are damaged they may still take pictures, but after replacing the floppy drive, the old pictures may not open and are lost. This is why you must test the drive's alignment with both test discs.
Spindle Motor Drive
The drive signals from the main FC-72 board to the spindle motor are at CN701/pins 9-18. Since the spindle motor speed has to be controlled so the data is not read too fast or too slow, clock pulses at CN701/pin 14 are used to drive (increment) the spindle motor. The Index signal is a 5Hz square wave from the floppy drive that is generated once for each revolution of the disc. This index pulse identifies a point on the disc that passes the heads.
CN201 (FD85) CN101 (FD90) CD BD. CN101
17 2
LENS ASSY.
IC101/ IC201 IMAGER
CCD OUT
4,5
IC102 S/H, AGC A/D CONV.
12 BIT PARALLEL LINES
IC301 CAMERA/DSP/ MEM
IC901 VIDEO AMP IC252 AUDIO PROCESS
Y,R-Y,B-Y LCD DRIVE (PK BD.)
49
CN801/ CN701
VIDEO OUTPUT
HI-2 14,
15 510
914
IC101 TIMING GEN. IRIS FOCUS ZOOM
IC501 MC
16 BIT DATA
47
AUDIO OUTPUT IC253 AUDIO AMP CN702
3,4 1,2
V1-4
HALL DET.
MOTOR DRIVE D501 DISC ACCESS
SPKR.
IRIS FEEDBACK
IC702 FD CONT.
+
FAST CHG. ON 6 CN3/CN2
4
CN257 FU-72 BD.
MIC.
DC IN FU BD.
IC404 IC404 DISC IN HI 7 3 CONT. OUTPUT INIT. CHG.ON CN4/CN1 VOLTAGES
9 4
F001
10 3
F002
7 6
IC001 DC CONV.
CAMERA PANEL DRIVE +5V
IC704 DATA AMP MOTOR DRIVE TRACK 00 DET. SPIN INDEX MOTOR CN 702
11 1-5 1-5
F003
11 2
STEP. MOTOR DRIVE
19
F005 CN701
5
9 10
1-4 6-8
12 17 18
HEADS SIDE 0 FLOPPY DISC DRIVE
CN 703
HEADS SIDE 1
13DSC1 1311 3/14/01
FLOPPY DISC DRIVE
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43
Spindle Motor Drive Signals Signal Name FPTS HDS FDD_Gnd FDD_Gnd Clock MC Index FDD_5V FDD_5V Location CN701/pin 18 CN701/pin 17 CN701/pin 16 CN701/pin 15 CN701/pin 14 CN701/pin 12 CN701/pin 11 CN701/pin 10 CN701/pin 9 Voltage - Disc not spinning 5Vdc 4.8Vdc 0Vdc 0Vdc 0Vdc 5Vdc 5Vdc 5Vdc 5Vdc From drive Signal Name PA PB PNA PNB Location Rotation signal Comments
Stepper Motor Drive
The stepper motor is connected to the read/write heads and can move the heads from the outside track 00 to the inside data area of the floppy disc. After a disc is detected, the spindle motor turns and the stepper motor is instructed to move the heads to track 00. Two out-of-phase stepper motor drive signals, from the main FC-72 board are applied to motor coils A and B at CN701/pins 1-4 for movement. Each motor coil that receives the signal is 16 ohms. All four signals must be present for the stepper motor to rotate.
Stepper motor Dive Signals Voltage no motor movement Description + drive to coil A + drive to coil B - drive to coil A - drive to coil B
CN701/pin 1 0Vdc CN701/pin 2 0Vdc CN701/pin 3 0Vdc CN701/pin 4 0Vdc
The following waveforms show two of the four drive signals going to coils A and coil B.
Index
T
Spindle Motor Drive Signal (clock) PA
1 T
pkpk
8.33 V, freq
666 Hz
1
Clock
2 CH1!2.00 V= CH2!5.00 V= PKD MTB1.00 s- 1.02dv ch1-
PNB
2
Spindle Motor Signals Name Location Voltage Index CN701/pin 11 5Vp-p Clock CN701/pin 14 4Vp-p Time Base = 1 second/div.
CH1!5.00 V= CH2!5.00 V=
PKD MTB20.0ms- 1.02dv ch1+
CN201 (FD85) CN101 (FD90) CD BD. CN101
17 2
LENS ASSY.
IC101/ IC201 IMAGER
CCD OUT
4,5
IC102 S/H, AGC A/D CONV.
12 BIT PARALLEL LINES
IC301 CAMERA/DSP/ MEM
IC901 VIDEO AMP IC252 AUDIO PROCESS
Y,R-Y,B-Y LCD DRIVE (PK BD.)
49
CN801/ CN701
VIDEO OUTPUT
HI-2 14,
15 510
914
IC101 TIMING GEN. IRIS FOCUS ZOOM
IC501 MC
16 BIT DATA
47
AUDIO OUTPUT IC253 AUDIO AMP CN702
3,4 1,2
V1-4
HALL DET.
MOTOR DRIVE D501 DISC ACCESS
SPKR.
IRIS FEEDBACK
IC702 FD CONT.
+
FAST CHG. ON 6 CN3/CN2
4
CN257 FU-72 BD.
MIC.
DC IN FU BD.
IC404 IC404 DISC IN HI 7 3 CONT. OUTPUT INIT. CHG.ON CN4/CN1 VOLTAGES
9 4
F001
10 3
F002
7 6
IC001 DC CONV.
CAMERA PANEL DRIVE +5V
IC704 DATA AMP MOTOR DRIVE TRACK 00 DET. SPIN INDEX MOTOR CN 702
11 1-5 1-5