Casio QV-300 (B) Troubleshooting guide

R
QV-300 (B)(KX-727B)
NOV. 1996
(without price)
(For NTSC)

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM......................................................................................... 2
FLOW DIAGRAMS ........................................................................................ 3
POWER SUPPLY CIRCUIT OPERATION.....................................................5
TROUBLESHOOTING ................................................................................... 8
DISASSEMBLY.............................................................................................. 9
ASSEMBLY.................................................................................................. 11
PRINTED CIRCUIT BOARDS...................................................................... 13
EXPLODED VIEW........................................................................................ 15
PARTS LIST................................................................................................. 16
SCHEMATIC DIAGRAMS............................................................................ 23
WAVEFORMS.............................................................................................. 27

— 1 —
SPECIFICATIONS
Item Specification
1. Recording System Digital (JPEG based)
2. Signal System NTSC
3. Recording Medium Built-in 32-Mbit flash memory
4. Number of Memory Pages FINE(VGA) : 64 (approximately 480-kbit compressed)
NORMAL(Quarter-VGA) : 192 (approximately 160-kbit compressed)
5. Delete Functions Single page; All pages (with page protect feature)
6. Imaging Device 1/4-inch CCD (Total Number of Pixels: 360,000)
7. Lens 2 focal points with macro position: F2.6 f=4.9 mm/f=11.0 mm
8. Aperture F2.6/F8 manual switching
9. Focal Length f=4.9 mm F2.6/NORMAL : 0.6 m (2') ~ ∞;
f=4.9 mm F2.6/MACRO : 9 cm (3.5") ~ 11 cm (4.3")
f=4.9 mm F8/NORMAL : 0.3 m (1') ~ ∞;
f=4.9 mm F8/MACRO : 7 cm (2.8") ~ 14 cm (5.5")
f=11.0 mm F2.6/NORMAL : 3.4 m (11.2') ~ ∞;
f=11.0 mm F2.6/MACRO : 52 cm (1.7') ~ 62 cm (2')
f=11.0 mm F8/NORMAL : 1.7 m (5.6') ~ ∞;
f=11.0 mm F8/MACRO : 44 cm (1.4') ~ 77 cm (2.5')
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. Resolution FINE, NORMAL
19. Monitor 61,380-pixel 2.5-inch TFT low-glare color LCD: doubles as finder
20. PC Output Image 480 × 640 dots (FINE)
240 × 320 dots (NORMAL)
21. Terminals DIGITAL; VIDEO OUT; DC IN 6 V
22. Power Supply Batteries (AA-size Alkaline or Lithium batteries ×4)/AC Adaptor
23. Battery Life LR6 (AM3) AA-size alkaline batteries
Approximately 130 minutes continuous operation (Play mode)
Recording for about 96 images (one image per minute)
FR6 AA-size lithium batteries
Approximately 220 minutes continuous operation (Play mode)
Recording for about 180 images (one image per minute)
24. Dimensions 72 (H) ×162 (W) ×49 (D) mm/
2.8" (H) ×6.4" (W) ×1.9" (D)
25. Weight Approximately 250 g / 8.8 oz (excluding batteries)
26. Accessories Wrist strap; soft case; video cable; cleaning cloth

— 2 —
BLOCK DIAGRAM
CCD
Camera Unit
IC700
HG51D291FE
Digital PCB
IC703
LC99092-Z03
8 bit to 16 bit
converter
Color processor
IC602
KM29V32000T
32Mbit
Flash memory
IC601
HM51W4260
4Mbit DRAM
IC701
µPD482445LGW
4Mbit VRAM
IC702
µPD6461GS
On screen
display
VRAM
contoroller Video
encoder
D/A
converter
ROM
RAM
Direct
memory
access
controller
Bus
state
controller
Serial
communication
interface
IC600
HD6437042Y03F
Data
compressor
expander
Video out
Key PCB
A/D
converter
Lens
Digital I/O
IC300
IR3P90Y1
Chroma circuit
IC400
MSM6770CGS
Display controller
Linear PCB
Power
supply
Power
supply
AC Adaptor
Battery
Back
light LCD
CPU
I/O
port

— 3 —
FLOW DIAGRAMS
REC mode
1Exposure and Analog to Digital conversion by Camera unit
28 to 16 bits conversion by IC703
3Storage for work
4Color processing by IC703: Ye,Cy, Gr →Y, By, Ry
5Storage for work
6, 7Video encode by IC 700 and IC701: Y, By, Ry →Video
8Video out
When pressing the shutter button
Camera Unit
IC703
LC99092-Z03 IC700
HG51D291FE
IC701
µPD482445LGW
IC602
KM29V32000T
IC601
HM51W4260
IC600
HD6437042Y03F
Digital PCB
1
2
3
4
5
6
7
8
CCD A/D
Converter
IC703
LC99092-Z03 IC700
HG51D291FE
IC701
µPD482445LGW
IC602
KM29V32000T
IC601
HM51W4260
IC600
HD6437042Y03F
Digital PCB
2
3
4
5
6
7
8
Camera Unit
1
CCD A/D
Converter

— 4 —
1Reading from Flash memory and storage for work
2Expansion by IC700
3Storage for work
4, 5. Video encode by IC 700 and IC701: Y, By, Ry →Video
6Video out
1Exposure and Analog to Digital conversion by Camera unit
28 to 16 bits conversion by IC703
3Storage for work
4Color processing by IC703: Ye, Cy, Gr →Y, By, Ry
5Storage for work
6Compression by IC700
7Storage for work
8Storage to Flash memory
PLAY mode
IC703
LC99092-Z03 IC700
HG51D291FE
IC701
µPD482445LGW
IC602
KM29V32000T
IC601
HM51W4260
IC600
HD6437042Y03F
Digital PCB
1
2
3
4
5
6
Camera Unit
CCD A/D
Converter

— 5 —
1
2
3
4
5
6
7
8
1
2
35
4
VCC1
VCC1
IC505
VCC1
VCC1
R515
Q514
1
23
C523
VCC3-1
VCC3-1
KEY0
KEY2
PON
KEY1
VCC3-1
VCC3-1
GND
GND
CN601
FU500 R516 IC507
C548
R511
C254
R514
C521
R517
R510
1 2 3 4
8 7 6 5
R512 Q503
R513 Q513
R509
Q512
1
1
1
23
2
2
3
3
C520
C531
++
OUT
VDD
GND
NC
NC
CK D Q GND
VCC
PR
CLR
Q
OUT
VCC
GND
INA
INB
3
2
1
4
5
1PON from
Key PCB
2APO from Pin 42
of IC600
6Voltage detection signal
3POB to Pin102
of IC600
4FACT from
Pin 36 of IC600
5Power ON to Pin 3 of Q505
POWER SUPPLY CIRCUIT OPERATION
1
2
3
4
5
6
Signal
PON
APO
POB
FACT
Power On
Voltage
detection
Operation
Power on/off signal (pulse) from SW900 on Key PCB
Auto power off signal (pulse) from pin 42 of IC600
Power on/off recognition signal to pin 102 of IC600
ON: H (VCC3) OFF: L (GND)
Forced power on signal from pin 36 of IC600
Forced ON: H (VCC3) OFF: L (GND)
ex. While writing to flash memory
Power on/off signal to pin 3 of Q505
ON: H (VCC1) OFF: L (GND)
Normal: H
Low voltage: L

— 6 —
Power on
1. PON
2. APO
3. POB
4. FACT
5. Power On
6. Voltage
detection
Power off
1. PON
2. APO
3. POB
4. FACT
5. Power On
6. Voltage
detection
H (VCC1)
L
L
H (VCC3)
L
L
H (VCC1)
L
H (VCC0)
H (VCC1)
L
L
H (VCC3)
L
L
H (VCC1)
L
H (VCC0)
L
1
4
7
6
CK
Q
PR
CLR
Operation
NAND gate
Flip-flop
Voltage detector
IC
IC505
IC506
IC507
1
2
5
Pin 1 (OUT)
H
L
Pin 2 (VDD)
> 3.2 V
< 3.2 V
Time Chart

— 7 —
Power off by APO
1. PON
2. APO
3. POB
4. FACT
5. Power On
6. Voltage
detection
Power off by low voltage detection
1. PON
2. APO
3. POB
4. FACT
5. Power On
6. Voltage
detection
H (VCC1)
H (VCC3)
L
H (VCC3)
L
L
H (VCC1)
L
H (VCC0)
H (VCC1)
L
H (VCC3)
L
L
H (VCC1)
L
H (VCC0)
L
Forced power on by FACT
1. PON
2. APO
3. POB
4. FACT
5. Power On
6. Voltage
detection
H (VCC1)
L
L
H (VCC3)
L
H (VCC1)
L
H (VCC0)

— 8 —
TROUBLESHOOTING
No Display
1. Check the fuse (FU500) on the digital PCB.
2. Check the fuse (FU100) on the linear PCB.
3. Check the jack (JK500) on the digital PCB.
4. Check the power switch (SW900) on the key 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)