Casio QV-10B Troubleshooting guide

R
(with price)
QV-10B(KX-720B)
JUL. 1995

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ........................................................................................ 2
CIRCUIT OPERATION .................................................................................. 3
ADJUSTMENT............................................................................................. 13
DISASSEMBLY AND ASSEMBLY.............................................................. 17
PRINTED CIRCUIT BOARDS ..................................................................... 18
ELECTRICAL PARTS LIST......................................................................... 20
MECHANICAL PARTS LIST ....................................................................... 30
EXPLODED VIEW ....................................................................................... 31
PARTS LIST FOR ACCESSORIES............................................................. 32
REPAIR METHOD ....................................................................................... 33
SCHEMATIC DIAGRAMS ........................................................................... 35
WAVEFORMS.............................................................................................. 38

— 1 —
SPECIFICATIONS
Item Specification
1. Recording System Digital (JPEG based)/Field recording
2. Signal System NTSC
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 = 5.2mm
8. Aperture F2/F8 manual switching
9. Focal Length F2/NORMAL : 60cm to 310cm;
F2/MACRO :13cm to 16cm
F8/NORMAL :28cm to
∞ ;
F8/MACRO :10cm to 24cm
(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 -2EV to +2EV
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;
doubles as finder
19. Terminals DIGITAL; VIDEO OUT; DC IN 6V
20. Power Supply Batteries (AA-size Alkaline batteries X 4)/AC Adap-
tor (AD-C60)
21. Battery Life Approximately 120 minutes
22. Dimensions 66(H) X 130(W) X 40(D)mm /
2.6" (H) X 9" (W) X 1.6" (D)
23. Weight Approximately 190g / 6.7oz (excluding batteries)
24. Accessories Wirst strap; soft case; special video cable; AC adap-
tor (AD-C60) Alkaline batteries (LR6 X 4); cleaning
cloth; owner's manual; personal computer connec-
tion kit

— 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
3
3Linear 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.
5
5VIDEO OUT (Video I/O)
6
6DIGITAL (Serial I/O)
1
1Camera PCB 2 2Digital PCB
BLOCK DIAGRAM

— 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 —
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
4Camera Signal Processor (IC801)
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. .
Sample Hold,
AGC
From CCD
8bit A/D
Converter
Timing
Generator
D0~D7
to CCD From/to CPU
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 signal.
3
4
5
6
19
18
17
16
14 15
12 13

— 5 —
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
DIGITAL PCB
Camera PCB
DIGITAL (Serial I/O)
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.
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

— 6 —
1CPU (IC600)
Controls the CCD, D RAM, Flash memory and key operation.
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
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.
83, 84 VCC IN Power source.

— 8 —
Pin No. Terminal Name IN/OUT Function
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.
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
Control
Timing
Data
Compressor
V RAM
Control
Encoder
D/A
V RAM
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.
2Gate Array (IC700)

— 9 —
3 V 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
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.
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
6Power Supply
BUTTON RESISTOR CPU
VCC3-1
87 pin
88 pin
89 pin
KEY 0
KEY 1
KEY 2
KEY PCB
Key Matrix
VOLTAGE BUTTON RESISTOR KEY MATRIX CPU
VCC3-1 Shutter R900(1.8K) KEY0 87pin
VCC3-1 [+] R901(15K) KEY0 87pin
VCC3-1 MODE R902(1.8K) KEY1 88pin
VCC3-1 DISP R903(4.7K) KEY1 88pin
VCC3-1 ZOOM R904(10K) KEY1 88pin
VCC3-1 SELF R905(27K) KEY1 88pin
VCC3-1 [-] R906(1.8K) KEY2 89pin
VCC3-1 DEL R907(15K) KEY2 89pin
Block Diagram
Header Image data Color
record Max; 96 images Information

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

— 11 —
IC400
VCO
Clock
SW
Control
PD
Amplitude
control TAB/COG SW
Test
Horizontal
control
Mode control
POCL
1/2
Vertical
control
SYNC
judgment
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
HDB SRT
CLR
OE
GPCK GSRT GRES
M1~M7
MBUI
AFT
UHF
KCB
AVB
KDB
LOE0
CK2

— 12 —
TFT-LCD
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.
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
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 —
Item Measuring Instrument
VCC2 voltage setting Voltmeter, Regulated power supply
VBL voltage setting Voltmeter, Regulated power supply
Vcom adjustment Patern 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
ADJUSTMENT
LINEAR PCB
Items to Be Adjusted
Adjustment and Test Point Locations
Top View
CP302
VR303
VR302
CP410
CP412
VR300 CP108
VR100
CP111
VR101
VR400
VR304

— 14 —
QV-10
Set Oscilloscope
Input
CP101
Pattern
generator
Output
CP410
0± 0.25 [V]
6.0 ± 0.1 [V]
QV-10
Set
Input
DC Jack
Regulated
power
supply
Output
CP111
Voltmeter
5.0 ± 0.05 V
QV-10
Set
Input
DC Jack
Regulated
power
supply
Output
CP108
Voltmeter
5.0 ± 0.05 V
VCC2 Voltage Setting
Equipment Connection / Adjustment Procedure
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
Adjust for 4.50 ±0.02 V
reading on voltmeter.
VR100 Voltmeter CP108
VBL Voltage Setting
Adjust for 5.0 ±0.05 V
reading on voltmeter.
VR101 Voltmeter CP111
Vcom Adjustment
Color bar
45.75 MHz
CP101 Oscilloscope CP410
Pattern
generator
VR303
VR302
Adjust VR303 so that square-
wave to read 6.0 ±0.1 V.
AdjustVR302 so that high level
of the square-wave is at 0.0 ±
0.25 V.

— 15 —
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.
ON
OFF
H
M
L
Set Photo
diode Oscilloscope
60Hz
Band-pass
filter
Photo sensor amp.
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
VR302 Adjust for ripple at minimum.
Photo sensor
amp.
Band pass filter
Oscilloscope
Free-running Frequency Adjustment
Pattern
generator QV-10
Set
Output
CP302
Input
CP101
Frequency
Counter
Pattern
generator CP101 VR400 CP302
Color bar
45.75 MHz Adjust for a reading of
15.734 ±0.1 KHz.
Frequency
Counter

— 16 —
IBM PC
Cable for LK-1
QV-10
Lens
Color filter
Light
source
Bright and Contrast Adjustment
QV-10
Set Oscilloscope
Input
CP101
Pattern
generator
Output
A
B
CP412
CP410 Trigger
10 KVCC2
CP303
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
Pattern
generator CP101 Oscilloscope CP412
Color bar
45.75 MHz VR304 VR300
AdjustVR304untilAintheabove
diagram equals 3.5 ±0.1 V.
AdjustVR300untilBintheabove
diagram equals 3.1 ±0.1 V.
Color Adjustment

— 17 —
12
22
20
24
25
2
11
DISASSEMBLY AND ASSEMBLY
Disassembly
1. Remove two screws L.
2. Remove two screws O.
3. Take the upper case 2and the battery cover A.
4. Disconnect two connectors CN602 and CN603.
5. Remove two screws N.
6. Take out the camera unit J.
Assembly
Assembly of the QV-10 can be performed in the reverse order of the disassembly steps.
Points of assembly work and procedure.
1. Not to damage the slide switch.
Gently set the switch knob to the point of the slide switch.
Confirm that the point of the slide switch is inserted into the switch knob.
Push the upper case in the direction of the lower case.
2. Push hard the upper case with both hands in the direction of the lower case.

— 18 —
PRINTED CIRCUIT BOARDS
LINEAR
IC300
R423
R410 R409 R408
R422
R426
R425
C408
R401
R412
R402
R411
C405
R400 R142
R140
R141
C141
L401
R112
R121 R110
R111
C150
R321 R328
R320
C333
R420
R421
R424
C327
R319 R318
C321
R316
C318
R317
C303
C301
R300
C300
R301
C307
C311
C312 C310 L300
R306
R313 C317
D103 D101 C120 D102
L100
FU100
VR100
VR101
VR400
C404
Q400
VR302
VR303
C322
C401
C409
C414
T150
CN150
CN100
VR304
VR301
C309
+
+
+
+ +
+
C100
C101
C144
C125
C123 C121
1
H300
VR300
T100
IC100
R316
Q401
D105
Top View
C308
R309 R308
R302 R307
R303
R304 C304
C332
R327
C306
R305
C314
C315
R311 R315
R312
R314
R323
C330
C328
R326
R324
R332C331
R325
C324
R100C411R428
R402
C410
R427
R429
R406
R405
R407
L400
C140
C110
R113
C113
C111
C143
R414
C407 C413
C412
R413
L402
C329
R115
R114
C142
C151
R404
R403
C126
C124 C122
L103
C112
C325
L301
L102
C127
D104
R120
Q100
D106
C129
C128
Q150 Q101
C152
Q102
R150
IC150
IC400
C323
C326
C320
C334
SW100
CN400
C313
C335
R310
R319
C302
C305
C406
IC101
Bottom View