CASIO QV300B Service Manual

(without price)

QV-300 (B) (KX-727B)

(For NTSC)

NOV. 1996

R

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

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

— 1 —

BLOCK DIAGRAM

Camera Unit

Digital PCB

A/D

IC701

IC702

Lens

CCD

µPD6461GS

converter

µPD482445LGW

On screen

4Mbit VRAM

display

VRAM

Video

contoroller

encoder

IC703

LC99092-Z03

8 bit to 16 bit

D/A

converter

converter

Color processor

Data

compressor

expander

IC700

HG51D291FE

IC602

KM29V32000T

32Mbit

ROM

Direct

Flash memory

memory

access

RAM

controller

Bus

IC601

CPU

state

Power

controller

HM51W4260

supply

4Mbit DRAM

I/O

Serial

communication

port

interface

IC600

HD6437042Y03F

Digital I/O

Video out

Linear PCB

IC300

IR3P90Y1

Chroma circuit

IC400

MSM6770CGS Display controller

Power supply

Back

light LCD

AC Adaptor

Battery

Key PCB

— 2 —

FLOW DIAGRAMS

REC mode

1
	A/D	2	4	6	8
CCD		IC703		IC700
	Converter	LC99092-Z03		HG51D291FE
Camera Unit					7
				IC701
		IC602		µPD482445LGW
		KM29V32000T
			3	IC600
		IC601		HD6437042Y03F
			5
		HM51W4260
				Digital PCB

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, 7 Video encode by IC 700 and IC701: Y, By, Ry → Video

8 Video out

When pressing the shutter button
1
	A/D	2	4	6
CCD		IC703		IC700
	Converter	LC99092-Z03		HG51D291FE
Camera Unit
				IC701
		IC602		µPD482445LGW
		KM29V32000T
		8
			3	IC600
		IC601		HD6437042Y03F
			5
		HM51W4260
		7		Digital PCB
		— 3 —

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

A/D

CCD Converter

Camera Unit

		2
	IC703	6
		IC700
	LC99092-Z03	HG51D291FE
		4
		5
		IC701
	IC602	µPD482445LGW
	KM29V32000T
	1	IC600
	IC601	HD6437042Y03F
		3
	HM51W4260
		Digital PCB

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

6 Video out

— 4 —

POWER SUPPLY CIRCUIT OPERATION

VCC1

R515

2 APO from Pin 42 of IC600

R517

					IC507			2	Q514
		FU500	R516		1 OUT NC 5		C521		3
				+				1
			+		3 VDD
					2
					GND NC 4				C523
		C548	C531
									6 Voltage detection signal
			VCC1						VCC3-1
			R510		3			1 2 3 4	R514	3 POB to Pin102
								8 7 6 5
					C520 1			VCC PR CLR Q
								CK D Q GND
			R511		Q503				2	of IC600
				R512
	CN601				2
		2			C254				3
									Q513 1
	KEY0	1				R513
1 PON from	KEY2	3
	PON
		4
Key PCB	KEY1
		5
	VCC3-1							VCC1
		6			VCC1
	VCC3-1		VCC3-1
		7
	GND								R509
		8			IC505
	GND
					4 OUT GND	3
					INA	2		2	Q512
					5 VCC INB	1
									3	4 FACT from
								1		Pin 36 of IC600

			5 Power ON to Pin 3 of Q505
	Signal		Operation
1	PON	Power on/off signal (pulse) from SW900 on Key PCB
2	APO	Auto power off signal (pulse) from pin 42 of IC600
3	POB	Power on/off recognition signal to pin 102 of IC600
		ON: H (VCC3)	OFF: L (GND)
4	FACT	Forced power on signal from pin 36 of IC600
		Forced ON: H (VCC3) OFF: L (GND)
		ex. While writing to flash memory
5	Power On	Power on/off signal to pin 3 of Q505
		ON: H (VCC1)	OFF: L (GND)
6	Voltage	Normal: H
	detection	Low voltage: L

— 5 —

IC

Operation

IC505

NAND gate

1

5

2

IC506

Flip-flop

1

7

CK

PR

Q

CLR

IC507

Voltage detector

4

6

Pin 2 (VDD)

Pin 1 (OUT)

> 3.2 V

H

< 3.2 V

L

Time Chart

Power on				Power off
1. PON			H (VCC1)	1. PON
			L
2. APO			L	2. APO
3. POB			H (VCC3)	3. POB
			L
4. FACT				4. FACT
			L
5. Power On			H (VCC1)	5. Power On
			L
6. Voltage			H (VCC0)	6. Voltage
detection				detection

H (VCC1) L

L

H (VCC3) L

L

H (VCC1) L

H (VCC0) L

— 6 —

Power off by APO

1. PON

2. APO

3.POB

4.FACT

5.Power On

6.Voltage detection

Forced power on by FACT

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

L

H (VCC3) L

H (VCC1) L

H (VCC0)

Power off by low voltage detection

1.PON

2.APO

3.POB

4.FACT

5.Power On

6.Voltage detection

H (VCC1)

L

H (VCC3) L

L

H (VCC1) L

H (VCC0) L

— 7 —