Casio QV-70C Troubleshooting guide

R
QV-70B(NTSC)
QV-70C(PAL)
OCT. 1997
(without price)
(KX-770)
PLAY
LCD
ON/OFF
REC
POWER
/PROTECT ZOOM DISP
DEL
MODE
ON/OFF
+
–

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ........................................................................................ 2
COLOR ADJUSTMENT ................................................................................. 3
MEMORY RESTORING AND RESET ........................................................... 4
DISASSEMBLY ............................................................................................. 6
ASSEMBLY ................................................................................................... 8
PRINTED CIRCUIT BOARDS ....................................................................... 9
EXPLODED VIEW ....................................................................................... 12
PARTS LIST ................................................................................................ 13
SCHEMATIC DIAGRAMS ........................................................................... 19
WAVEFORMS.............................................................................................. 24

— 1 —
SPECIFICATIONS
1. Recording System Digital (JPEG based)
2. Video Signal System NTSC (QV-70B) / PAL (QV-70C)
3. Recording Medium Built-in 2-MB flash memory
4. Number of pages 96
5. Delete Functions Single page; All pages (with page protect feature)
6. Imaging Device 1/5-inch CCD (Total Number of Pixels: 250,000)
7. Lens Fixed focus with macro position; F2.8/f = 5.2 mm
8. Aperture F2.8/F8 manual switching
9. Focal Length F2.8/NORMAL : 0.6 m to 3.0 m
F2.8/MACRO : 12 cm to 14 cm
F8/NORMAL : 0.4 m to ~
F8/MACRO : 10 cm to 18 cm
(from lens protection filter)
10. Light Metering TTL center point by photographic element
11. Exposure Metering Aperture priority AE
12. Exposure Range EV +6 to 18
13. Exposure Adjustment –2 EV to +2 EV
14. Shutter System Electronic
15. Shutter Speed 1/8 to 1/4000 second
16. White Balance Automatic
17. Self-timer 10-second
18. Monitor 61,380-pixel 1.8-inch TFT low-glare color LCD
19. Terminals DIGITAL; VIDEO OUT; DC IN 6 V
20. Power Supply Batteries (AA-size Alkaline or lithium batteries ×3) /AC Adaptor
21. Current Consumption Approximately 550 mA (REC mode)
22. Dimensions 66(H) ×103(W) ×34(D)mm
23. Weight Approximately 150 g (excluding batteries)
24. Accessories Wirst strap; soft case; video cable;
Alkaline batteries (LR6 ×3)
Item Specification

— 2 —
BLOCK DIAGRAM
Camera Unit Digital PCB
Linear PCB
Video out
Key PCB
Digital I/O
AC Adaptor
Battery
Lens CDD A/D
converter
IC602
TC5816AFT-1
16M bit
Flash memory
IC601
HM514800CLJ
2M bit DRAM
IC701
HM538123BJ (NTSC)
HM538253BJ (PAL)
2M bit VRAM
VRAM
controller Video
encoder
D/A
converter
IC700
HG51B167FB
Data
compressor
expander
Direct
memory
access
controller
Bus
state
controller
Serial
communication
interface
ROM
RAM
CPU
I/O
port
IC600
HD6437034SK24F (NTSC)
HD6437034AK28F (PAL)
Power
supply LCD
Back
light
Power
supply
IC300
IR3P90Y1 (NTSC)
IR3Y21 (PAL)
Chroma circuit
IC400
MSM6770CGS
Display controller

— 3 —
COLOR ADJUSTMENT
THE COLOR ADJUSTMENT IS REQUIRED AFTER THE FOLLOWING SITUATIONS
* The flash memory is initialized by the "AMED-I" command.
* The digital PCB or the camera unit is replaced.
REQUIRED TOOL
Light box: Handy 5000 (Code No.: 1904 5301)
Color filter: LBA 3 (Code No.: 1904 5302)
Color adjustment software: Sdj770vb.exe
Cable for QV-Link
TO DO THE COLOR ADJUSTMENT
1. Connect QV-70 to PC with QV-Link cable.
2. Set the aperture switch of QV-70 to F8.
3. Put the color filter on the light box, and turn the light box on.
4. Put the QV-70 with its lens toward the color filter and light box, and turn the QV-70 on.
5. Execute the color adjustment software "Sdj770vb.exe" on PC (MS-DOS).
Type "Sdj770vb", then press Enter. The message "WAIT" appears on the QV-70 and some parameters
appear on the PC like as the followings.
SUMCODE = 835321
adjust for KX770.
*******************************************
* COLOR ADJUSTMENT for KX770 *
* ver 1.0 *
*******************************************
CAUTION!!! Set f-stop to F8, otherwise doesn't work correctly.
Now adjusting... 0 2
done.
System block 1FE
ASUM 4AB40 CSUM 35662
DSUM 2EA67 ESUM 558FF
RKD FE30 RKE 1D0
BKA 1F0 BKC FE10
GKC 200 GKD 100 GKE FF00
ALPHA FFFC BETA FF82 TINT 155
RAlimit_L BBB RAlimit_H FE0
BAlimit_L 1298 BAlimit_H 1ECE
COL_BAS 28 Y_OFFSET 2
RAMP_INIT DCD BAMP_INIT 18B3
LIN_SUB 108 LIN_SUBY F8
Color filter: LBA 3
Light box: Handy 5000 QV-70

— 4 —
MEMORY RESTORING AND RESET
MEMORY ERROR
"Memory error" (#1 ~ #3) message appears on QV-70 camera, when an error is found in its flash memory. In this
case, the QV-70 is locked up and do not accept any operation except power on / off.
MEMORY ERROR #1
When the memory error #1 occures, press the + button to do the error reset. The following display will be appeared on
QV-70.
ERROR RESET
YES SHUTTER
NO CALL TECH
SUPPORT!
Then press the shutter button. The display should return to normal.
(Refer to owner´s manual for QV-70.)
MEMORY ERROR #2, #3
When the memory error #2 or #3 occures, do the memory restoring.
Notes: 1. When do the error reset or memory restoring, use the AC adaptor.
2. Never turn the power off, while doing the error reset or memory restoring.
MEMORY RESTORING
REQUIRED TOOL
Memory restoring software: Amed.exe
Cable for QV-Link
OPERATION
1. Connect the QV-70 to PC with the cable.
2. Execute the "AMED -PIR" command on MS-DOS, then the following message will be appeared on the PC.
QV series Automatic Memory Error Debugger ver 2.0
Camera type = QV-10A/QV-30 0090:532E
Searching management block ...
Found at bank 1FF status --- OK
Saving management block as "mngblk.dat"

— 5 —
Saving system block at bank 1FE as "sysblk.dat"
Image No. 1 in 006 007 008 009 00A save as "image001.cam"
Image No. 2 in 00B 00C 00D 00E 00F save as "image002.cam"
Image No. 3 in 010 011 012 013 014 save as "image003.cam"
--- Initialize Flash Memory
--- Create mamagement block at bank No.1FF
--- Reset
Restore system block at bank 1FE from "sysblk.dat"
Loading image "image001.cam"
Loading image "image002.cam"
Loading image "image003.cam"
3. The displays on the QV-70 are returned to normal.
When the memory error is not solved by the above steps, do the memory reset and color adjustment.
MEMORY RESET
1. Connect the QV-70 to PC with the cable.
2. Execute the "AMED -I" command on MS-DOS.
3. Do the color adjustment. (See COLOR ADJUSTMENT)

— 6 —
DISASSEMBLY
1. Remove the four screws.
2. Unhook the upper side of the unit, then open
the case from the upper side.
3. Be sure not to lose the bright knob, then remove the case.
4. Remove the two screws on the linear
PCB, then disconnect between the linear
and digital PCBs.
5. Disconnect the wire for the back light and the flat
cable for the LCD, then remove the linear PCB.
Screw
Hooks
Bright knob
Flat cable
Wire
Screws
Digital PCB
Linear PCB
Screw
Screws

— 7 —
6. Remove the key PCB and two screws on the digital PCB.
8. Unhook the slide switches of the camera unit, then remove
the digital PCB and the camera unit.
Digital PCB
Key PCB
Screws
7. Remove the two screws on the camera unit.
9. Remove the three screws, then remove the back light.
Note: Be sure not to lose the spacer.
Switch
Screws
Back light
Spacer for LED
Camera unit
Screws

— 8 —
ASSEMBLY
The assembly can be done by reverse order of the disassembly steps. The notes of the assembly are as follows;
1. Be sure to set the spacer and sheets on the LCD as the figure.
2. Be sure to align the switches on the camera unit with the switch knobs.
3. Be sure to align the slide switch on the key PCB with the switch knob for power. Switch knob
Slide switch
Switch knobs
Switches
Diffuser sheet
Dimmer sheet
LCD spacer
LCD