Casio QV-10A Troubleshooting guide

R
QV-10A (C)(KX-723C)
APR. 1996
(without price)
(For PAL)

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ........................................................................................ 2
CIRCUIT OPERATIONS ................................................................................ 3
COLOR ADJUSTMENT............................................................................... 13
ADJUSTMENT............................................................................................. 15
TROUBLESHOOTING................................................................................. 18
DISASSEMBLY ........................................................................................... 19
ASSEMBLY ................................................................................................. 20
PRINTED CIRCUIT BOARDS ..................................................................... 21
EXPLODED VIEW ....................................................................................... 23
PARTS LIST ................................................................................................ 24
SCHEMATIC DIAGRAMS ........................................................................... 31
WAVEFORMS.............................................................................................. 34

— 1 —
Item Specification
1. Recording System Digital (JPEG based)/Field recording
2. Video Signal System PAL
3. Recording Medium Built-in 16-Mbit 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/f = 5.2 mm
8. Aperture F2.8/F8 manual switching
9. Focal Length F2.8/NORMAL : 60 cm to 310 cm;
F2.8/MACRO : 13 cm to 16 cm
F8/NORMAL : 30 cm to y;
F8/MACRO : 11 cm to 21 cm
(from lens protection filter)
10. Light Metering TTL center point by photographic element
11. Exposure Metering Aperture priority AE
12. Exposure Range EV +5 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 batteries ×4)/AC Adaptor
21. Battery Life Approximately 120 minutes (Playback mode)
22. Dimensions 66(H) ×130(W) ×40(D)mm /
2.6" (H) ×9" (W) ×1.6" (D)
23. Weight Approximately 190 g / 6.7 oz (excluding batteries)
24. Accessories Wirst strap; soft case; special video cable;
Alkaline batteries (LR6 ×4); cleaning cloth
SPECIFICATIONS

— 2 —
CCD V RAM
HM53812BJ8
Gate Array
HG51B167FB
Flash
Memory
TC5816FT-1
D RAM
HM514B00
ALJ8
Power Supply
Circuit
DC IN (6V) Key
CPU
HD6477034F16
Key PCB
AC adaptor
Battery x 4
IC400
MSM6770GS
IC300
IR3P90Y
LCD
33
33 Linear PCB
1Camera Unit: It is used to provide color information.
2Digital PCB: It controls the CCD, compressed data, stores image in memory.
3Linear PCB: It generates the tricolor and controls the LCD display.
4LCD: 61,380-pixel 1.8-inch Thin Film Transistor low-glare color LCD.
5 VIDEO OUT(Video I/O): Use this terminal when connecting to the VIDEO IN terminal of
a TV, video tape deck, video printer, or other similar device.
6DIGITAL (SERIAL I/O): Use this terminal when connecting to a personal computer.
55
55 VIDEO OUT (Video I/O)
66
66 DIGITAL (Serial I/O)
11
11 Camera PCB 22 22 Digital PCB
BLOCK DIAGRAM
CPU
HD6437034F16

— 3 —
CAMERA UNIT (CAMERA PCB)
The camera unit is composed a lens, color filter, CCD (IC802), driver (IC800) and signal
processor (IC802). It produces voltages R, B, and G, for the colors red, blue, and green
when light from a scene is focused on the surface. These voltage values vary according
to the intensity of the respective color being scanned.
The camera unit must be replaced with whole unit when it is defective, because the precise
adjustment is required when the individual parts are replaced, and can be done only at our
factory.
2Color
Filter
Ye,Cy,Gr
color signal D0 ~ D7
IC800
Driver
VI1~ VI4
VS1 ~ VS4
PHI1~PHI4
PHS1~PHS4
MCK,
HRS2,
FTTRG,
STTRG,
CCODE,
ENDFLG
3IC802 (CCD)
Sample Hold,
AGC
CCD IN 8bit A/D
Converter
Timing
Generator
4IC801
CPU
Data Bus
D RAM
1Lens
Concentrates light rays to a point.
2Color filter
The striped color filter in front of the CCD detector is used to provide color information.
It has three colors, yellow, green and cyan.
Array of color filter and signal processing (IC801) for camera are extremely close relationship.
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Array of color filter
Red
Blue
Green
White
Mg=Blue+RedYe=Red+Green
Cy=Blue+Green
Mg
Ye
Cy
Three Primary colors
1Lens
Digital PCB
1 2 3 ~ 506 507 508
Camera PCB
CIRCUIT OPERATIONS

— 4 —
4Camera Signal Processor (IC801)
3CCD (IC802)
A charge-coupled device in which charges are introduced when light from a scene is focused on the surface
of the device. The image points are accessed sequentially to produce a television-type output signal.
Image pickup
Storage
Horizontal shift
register (CCD)
508(H)
532(H)
500(V)
492(V)
Output Amp.
PHIH1
PHIH2
PHIS4
PHIS2
PHIS1
PHIS3
PHI4
PHI3
PHI2
PHI1
VOG
VGG
VDD 8
Vout 9
PHIR 7
3
4
5
6
19
18
17
16
14 15
12 13
Effective picture element:
249,936 = 508 (H) x 492 (V)
PHIS1 ~ PHIS4:
Clock pulse for the storage.
PHI1 ~ PHI4:
Clock pulse for the image pickup.
PHIH1 ~ PHIH2:
Clock pulse for the horizontal shift
register.
PHIR:
CCD analog signal output.
D0 ~ D7:
Digital signal of the luminance and the
color difference B-Y and R-Y signal.
CCD IN:
CCD analog signal input.
VI1 ~ VI4/VS1 ~ VS4:
Clock pulse for the CCD control sig-
nal.
Sample Hold,
AGC
From CCD
8bit A/D
Converter
Timing
Generator
D0~D7
to CCD From/to CPU
Sample Hold
Selects a desired signal from the CCD.
Timing Genarator
Generates the clock pulse for the CCD.
8-bit AD converter
Analog signal from the CCD is converted into 8-bit digital signal of the luminance and the color difference
B-Y and R-Y signal. .

— 5 —
DIGITAL PCB
DIGITAL PCB
Key Input
TFT LCD
DC in +6V
Battery
ROM RAM
DMAC
BSC
SCI, Timmer
I/O Port
CPU
16M Flash Memory
4M D RAM
5IC601
Power Supply
+5V +18V -10V
Linear
PCB
IC300
Chroma
Circuit
IC400
Display
Control
Driver
IC802
CCD
Camera PCB
DIGITAL (Serial I/O)
IC801
IC800 Processor
D/A
2IC700 Gate Array
1M
V RAM
1IC600 Microprocessor
Control
Timing V RAM
Control
Encoder
VIDEO OUTPUT
(Video I/O)
Amp.
Data
Compre-
ssor
3IC701
4IC602
6
Digital PCB is composed Microprocessor (IC600), D RAM (IC601), Flash Memory (IC602), Gate Array (IC700),
and V RAM (IC701).
Microprocessor controls the CCD, D RAM, Flash Memory and key operation. Gate array compresses data
for the color and the luminance from the CCD to increase the number of memory, and up to 96 images can
be stored in flash memory. The color and the luminance data are mixed in the gate array to make the video
signal.
As to spare parts for digital PCB, Casio supplies PCB ass'y and the individual parts.

— 6 —
Address Data/Address
PROM/MASKROM1 RAM1
CPU
Interrupt
controller User break controller Direct state controller
Direct memory
access
controller
Serial communication
interface (x2channel) 16-bit integrated
timer pulse unit
Programmable timing
pattern controller A/D
converter Timer
Port B
Port A Address
Port C
A15 ~ A0
AD15 ~ AD0
CS3 ~ CS0, A21 ~ A16PA15 ~ PA0
PC7 ~ PC0 PB0 ~ PB15
Reset,
MD2 ~
MD0,
EXTAL,
XTAL
Address bus 24-bit
Data bus 16-bit
Address bus 24-bit
High-order 8-bit
Low-order 8-bit
CK
1CPU (IC600)
Controls the CCD, D RAM, Flash memory and key operation.
Address
Data / Address

— 7 —
CPU PIN FUNCTION
Pin No. Terminal Name IN/OUT Function
1 PB14 OUT Timing pattern output.
2 PB15 — Not used.
3 VSS IN Ground terminal.
4 - 11 AD0 - AD7 IN/OUT Address bus.
12 VSS IN Ground terminal.
13 - 14 AD8 - AD9 — Not used.
15 VCC IN Power source.
16 - 21 AD10 - AD15 — Not used.
22 VSS IN Ground terminal.
23 - 30 A0 - A7 OUT Address bus.
31 VSS IN Ground terminal.
32 - 33 A8, A9 OUT Address bus.
34 - 39 A10 - A15 — Not used.
40 VSS IN Ground terminal.
41, 42 A16, A17 — Not used.
43 VCC IN Power source.
44 - 47 A18 - A21 — Not used.
48 - 50 CS0 - CS2 — Not used.
51 CASL OUT CAS(Column Address Strobe) signal for D RAM.
52 VSS IN Ground terminal.
53 PAO — Not used.
54 RAS OUT RAS(Row Address Strobe) signal for D RAM.
55 CS6 OUT Chip select signal.
56 WAIT — Not used.
57 WR OUT Write enable signal for outer memory (low-order 8-bit).
58 PA5 OUT Write enable signal for outer memory (high-order 8-bit).
59 RD OUT Read enable signal for outer memory.
60 PA7 — Not used.
61 VSS IN Ground terminal.
62 PA8 IN Bus request signal.
63 PA9 OUT Interrupt request signal.
64 - 66 PA10 - PA12 — Not used.
67 DREQ0 IN Interrupt request signal.
68 IRQ2 IN Interrupt request signal.
69 PA15 IN Interrupt request signal.
70 VCC IN Power source.
71 CK OUT System clock pulse.
72 VSS IN Ground terminal.
73 EXTAL IN Clock pulse input.
74 XTAL — Not used.
75 - 77 VCC, NMI, VPP IN Power source.
78 WDTOVF — Not used.
79 RES IN Reset signal input.
80 MD0 IN Ground terminal.
81 MD1 IN Connected to VCC3.
82 MD2 IN Connected to ground.

— 8 —
2Gate Array (IC700)
Control
Timing
Data
Compressor
V RAM
Control
Encoder
D/A
V RAM
Data Compressor
The color difference and the luminance data is compressed about 1/7 to increase the numer of images
in memory. Up to 96 images can be stored.
Y (luminance siganal) data : 480 x 224 byte
Cb (color difference signal B-Y) data : 160 x 112 byte 21,120 byte
Cr (color difference signal R-Y) data : 160 x 112 byte 1/7
Total : 143,360 byte 21,120 byte
Encoder
The color and the luminance data are mixed internally to make the video signal, and send it to the linear
PCB and the video out terminal.
Pin No. Terminal Name IN/OUT Function
83, 84 VCC IN Power source.
85, 86 AVCC, AVREF IN Connected to VCC3.
87 - 89 PC0 - PC2 IN Key input terminal.
90 PC3 IN Low battery detection terminal.
91 AVSS IN Ground terminal.
92 - 95 PC4 - PC7 — Not used.
96 VSS IN Power source.
97, 98 PB0, PB1 IN/OUT Port B.
99 VCC IN Power source.
100 - 105 PB2 - PB7 IN/OUT Port B.
106 VSS IN Ground terminal.
107 RXDO IN Data input terminal from a personal computer.
108 TXDO OUT Data output terminal to a personal computer.
109, 110 PB10, PB11 IN/OUT Port B.
111 PB12 — Not used.
112 PB13 — Not used.

— 9 —
VOLTAGE BUTTON RESISTOR KEY MATRIX CPU
VCC3-1 Shutter R900 (1.8 K) KEY0 87pin
VCC3-1 [+] R901 (15 K) KEY0 87pin
VCC3-1 MODE R902 (1.8 K) KEY1 88pin
VCC3-1 DISP R903 (4.7 K) KEY1 88pin
VCC3-1 ZOOM R904 (10 K) KEY1 88pin
VCC3-1 SELF R905 (27 K) KEY1 88pin
VCC3-1 [-] R906 (1.8 K) KEY2 89pin
VCC3-1 DEL R907
(
15 K
)
KEY2 89pin
3V RAM
It is used for encoder function.
4Flash Memory
Up to 96 images can be stored in memory. Flash memory does not require electrical power to store data,
so image data is retained in memory even when you turn camera power off.
If batteries go dead, simply load a set of new batteries or connect the AC adaptor and you will be able to
view images in camera memory.
Memory Map
Header
record Image data Max; 96 images Color Information
5D RAM
There is area of work space that the microprocessor uses for storing temporary data , the intermediate
results of calculations, and all sorts of pieces of information that the system needs to remember.
6Power Supply
Terminal Voltage Purpose
VCC3-0 4.75 ~ 5.15 (V) Logic circuit
VCC3-1 4.70 ~ 5.15 (V) Video output
VCC3-2 4.60 ~ 5.15 (V) Digital I/O
VCC6 17.80 ~ 18.20 (V) CCD
VEE3 -9.6 ~ -10.6 (V) CCD
KEY PCB
Block Diagram
BUTTON RESISTOR CPU
VCC3-1
87 pin
88 pin
89 pin
KEY 0
KEY 1
KEY 2
Key Matrix

— 10 —
Terminal Voltage Purpose
VCC2 4.3 ~ 4.7 (V) Logic crcuit
VCC4 9.5 ~ 11.0 (V) Display
VEE2 -7.0 ~ -8.0 (V) Display
VEE4 -16.5 ~ -17.9
(
V
)
Displa
y
LINEAR PCB
IC300 generates the tricolor (red, green and blue) from the video signal, and IC400 controls the TFT-LCD
display.
Power Supply
IC300
H filter
SYNC SEP
Trap D.L
ACC
ACC DET
BPF
APC Killer
F/F
Demo-
dulation
L
P
F
Matrix
Contrast INT/EXT SW
CLAMP
Color control
R Gain
B Gain
Clamp
Bright
AGC AMP
Picture
quality
ADJ.
AGC DET
INV INV
γ corrector
SWP GEN
COM DRIV
BGP GEN
9
11
8
30
27
6 7 36 32 33 25 24 5 1 20 4 3 2 51 50 44 45 34
46
47
48
41
31
Vref
17 14 18 21 22 23 15 10 16 13 12 28 38 35 37 39
VIDEO
F ADJ
ACC.F
APC.F
Killer.F
VCO COM.
AMP
FRP2
42
FRP1
Peek
Limitter
γ 1
γ 2
B-SUB-
BRI
40
43 B-SUB-
BRI
44 RGB.
AMP
PAL SWVCO
HD 29
26
BURST
-OUT 19
γ corrector
γ corrector
INV
H.F.OUT TRAP
SYNC-SEP
SYNC-OUT
SYNC-IN
TIME-CONST
CLAMP
COLOR
APL
AGC OUT
AGC.FIL
PICTURE
DCDET
R-OUT
G-OUT
B-OUT
VEE
VCC1
GND
VCC2
VEE
R-V
B-V
IDENT.F
CONT
CHROMA-OUT
EXT-R
EXT-G
EXT-B
SW
R-SUB-CONT
B-SUB-CONT
COM.OUT
BRIGHT

— 11 —
VCO
Clock
SW
Control
PD
Amplitude
control TAB/COG SW
Test
Horizontal
control
Mode control
POCL
1/2
Vertical
control
SYNC
j
udgment
Mute
VCO
AFT
control
Key control
Tuning program
control
Channel
bar control
Tuning Up/Down
counter
PDM D/A
SYNC
SEP. SYNC DET.
Analog
control
ADJ
OSC
SYF
PD
MCLK
TSI1
TSI2
TSI3
TSI4
TSI5
TSI6
VDB FRP HCNT AMUTEB CSYNC
VMUTEB
VLB
TUPCM
34 SW
VBAR
UBAR
39 AFTO
46 VREF
45 U1
44 VH1
43 VL1
41 OUT
U/V
Test
circuit
VD
VSync HSync
SD
CK2 Initial
SELFRB
Mode
set
VTUCK
PL1, PL2, PL3
PHO
CKB
5.9MHz
51
48
47
18
50
54
55
8
9
10
11
56
24 36 2 28 38
35
32
33
30
29
IC400
CK2
LOE0
51
HDB SRT CLR OE GPCK GSRT GRES
M1-M7 MBUI AFT UHF KCB KDB AVB

— 12 —
TFT-LCD
Y1
Y2
Y3
Ym
GND
Vy
Va
Vb
t1 t2 t3
X1 X2 X3 X4 Xn
Gate electrode
Picture
element A
Source electrode
TFT array substrate Common substrate
Frame period Selective period
Picture
element
A
Gate
pulse
T1 T2 T3 T4 Tn
Common
electrode
V COM
X1
Y3
Y2
Y1
t1
Each picture element electrode is controlled by a transistor. To the gate electrodes, the gate pulse is applied
timesharing. VCOM voltage is applied to the common electrodes.
The above figure shows the operation of TFT-LCD. If the gate pulse is not applied to the gate electrodes,
the transistors do not operate even when the potential difference is given between the common electrodes
and source electrodes, and no effect is given to the liquid crystal. If the gate pulse is applied to Y1, the
transistorT1 is in operation during a priod of t1, and voltage of source electrode of Va is applied to the LCD
layer of picture element A, then electric charges are stored in the picture element of A. After the period of
t1, T1 is turned off, and voltage in the LCD layer of A is held until next gate pulse comes, but it drops little
by little through off leak resistance of TFT and leak resistance of LCD itself.
BACK LIGHT
The camera unit is equipped with a fluorescent light source to provide the back lighting for its LCD. The
normal service life of the backlight is approximately six years, when the camera is used for about two hours
a day.
The backlight is consumption items, so even under guarantee replace it under charge basis.

— 13 —
COLOR ADJUSTMENT
EachofthismodelhasacolorinformationinitsflashmemoryduetotheCCDcamerahasacolorcharacteristic.
The color information is loaded in the flash memory when the color adjustment is done after assembling of this
model in our factory. A brand-new flash memory and digital PCB ass’y stocked in our spare parts center do
not have the color information, so the color adjustment should be done after the following situation.
• Replacing the digital PCB ass’y with the brand-new one
• Replacing the flash memory with the brand-new one
And it also should be done, after the following situation due to change of the color characteristic.
• Replacing the camera unit
The following items are required for the color adjustment.
• PC IBM PC/AT or compatible
RS-232C serial port
4 MB RAM minimum (8 MB recommended)
Microsoft MS-DOS Ver. 3.1 or later
• QV-10A support utility disk Color adjustment utility: ADJ723.EXE
(ADJ723.EXE will be run on MS-DOS)
• Light box Handy 5000 (Code No.: 1904 5301)
• Color filter LBA 3 (Code No.: 1904 5302)
• Cable and adapter for LK-1 connection kit
Notes: • The support utility disk for QV-10 does not work for QV-10A.
• Use an AC adapter for the power source of the QV-10A to avoid the failure of the adjustment.
• QV-10A support utility disk is supplied from CASIO. Please contact to Technical Dept., Overseas
Service Div.
• The light source and color filter are available in our spare parts center. Please order to our spare parts
div.
Preparation for the color adjustment
1. Copy the ADJ723.EXE file from the support utility disk to the hard disk in the PC.
2. Connect QV-10A to the RS-232C serial port (COM1) of PC with the cable for LK-1.
COM1
QV-10A
IBM-PC

— 14 —
Execution of the color adjustment
1. Set the aperture switch to F8 position, and turn on QV-10A.
F2F8
2. Put the color filter on the light source, and turn on the light box.
3. Put the QV-10A with its lens toward the light source.
Color filter: LBA 3
Light box: Handy 5000
4. Execute “ADJ723.EXE” on MS-DOS.
Type “ADJ723” and press Enter.
The message “WAIT” appears on the monitor of QV-10A.
Some parameters appear on the screen of your computer, then the color adjustment will be finished.
PC
QV-10A

— 15 —
Adjustment and Test Point Locations
Top View
Item Measuring Instrument
VCC2 voltage setting Voltmeter, Regulated power supply
VBL voltage setting Voltmeter, Regulated power supply
Vcom adjustment Pattern generator, Oscilloscope, Regulated power supply,
Photo sensor amp., Band pass filter
Free-running Frequency Pattern generator, Oscilloscope, Regulated power supply
adjustment
Bright and Contrast adjustment Pattern generator, Oscilloscope, Regulated power supply
Color adjustment IBM PC, Cable for LK-1, Light source, Color filter,
Color adjustment program
TP301
VR303
VR302
TP410
TP412
VR300 TP107
VR100
TP110
VR101
VR400
VR304
ADJUSTMENT
LINEAR PCB
Items to Be Adjusted

— 16 —
QV-10A
Set Oscilloscope
Input
TP101
Pattern
generator
Output
TP410
0 ± 0.25 [V]
6.0 ± 0.1 [V]
QV-10A
Set
Input
DC Jack
Regulated
power
supply
Output
TP110
Voltmeter
5.0 ± 0.05 V
QV-10A
Set
Input
DC Jack
Regulated
power
supply
Output
TP107
Voltmeter
5.0 ± 0.05 V
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
Adjust for 4.50 ±0.02 V
reading on voltmeter.
VR100 Voltmeter TP107
VBL Voltage Setting
Adjust for 5.0 ±0.05 V
reading on voltmeter.
Vcom Adjustment
Color bar
38.9 MHz
TP101 Oscilloscope TP410
Pattern
generator VR303
VR302
Adjust VR303 so that square-
wave to read 6.0 ±0.1 V.
AdjustVR302sothathighlevel
of the square-wave is at 0.0 ±
0.25 V.
EQUIPMENT CONNECTION / ADJUSTMENT PROCEDURE
VCC2 Voltage Setting
VR101 Voltmeter TP110

— 17 —
ON
OFF
H
M
L
QV-10A
Set Photo
diode Oscilloscope
60Hz
Band-pass
filter
Photo sensor amp.
Pattern
generator QV-10A
Set
Output
TP301
Input
TP101
Frequency
Counter
Vcom Adjustment
1) While pressing the MODE and the shutter button, slide to the right to turn on power.
2) Press the self-timer and the DEL button at a time.
3) Press [+] or [–] to select the BLACK.
4) Press the shutter button.
5) Place a photo diode on the middle of the display.
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
VR302 Adjust for ripple at minimum.
Free-running Frequency Adjustment
Pattern
generator TP101 VR400 TP301
Color bar
38.9 MHz Adjust for a reading of 15.734
±0.1 KHz.
Frequency
Counter
Photo sensor
amp.
Band pass filter
Oscilloscope

— 18 —
QV-10A
Set Oscilloscope
Input
TP101
Pattern
generator
Output
A
B
TP412
TP410 Trigger
10 KVCC2
CP303
TROUBLESHOOTING
No Display
1. Check the slide switch on the key PCB.
2. Check the fuse (FU500) on the digital PCB.
3. Check the fuse (FU100) on the linear PCB.
4. Check the jack (JK500) on the digital PCB.
5. Check the flat cable between the digital and linear PCBs.
6. Check the back light.
7. Check the LCD.
No Display at Record Mode
1. Check the camera unit.
Defect of the Camera Unit
The camera unit must be replaced with whole unit when it is defective, because the precise adjustment is
required when the individual parts of the camera unit are replaced, and it can be done only at our factory.
(Except for replacing the outer case of the camera unit)
Bright and Contrast Adjustment
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
Pattern
generator Color bar
38.9 MHz VR304
VR300
Adjust VR304 until A in the above
diagram equals 3.5 ±0.1 V.
Adjust VR300 until B in the above
diagram equals 3.1 ±0.1 V.
TP101 Oscilloscope TP412