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)

— 9 —
DISASSEMBLY
2. Remove the two screws on the bottom of the unit and
the battery cover. Then remove the upper case at
the bottom of the unit.
3. Then remove the upper case at the top of the unit.
4. Be careful not to lose the switch knob.
Switch knob
Hook
To disassemble the main unit
1. Rotate the camera unit then remove the two screws
on the side of the unit.

— 10 —
To disassemble the camera unit
Note: 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 the replacing the outer case.)
4. Unhook and remove the
lens and CCD unit from the
outer case as shown in the
picture.
Lever
1. Be sure to turn the lever to "TELE".
2. Remove the two screws.
3. Remove the cover of the camera unit at the
opposite side of the lever. Cover
Hook

— 11 —
ASSEMBLY
Switch knob
Slide switch
Switch knob
To assemble the main unit
1. Be sure to align the slide switch on the linear PCB
with the switch knob.
2. Be sure to align the slide switch on the key PCB with
the switch knob.
3. Push hard the upper case with both hands.

— 12 —
To assemble the main unit
1. Be sure to turn the lever to "TELE".
2. Be sure to align the lever of the outer case with the
knob of the lens.
3. Confirm if the lens is switched by the lever.
4. Be sure to align the switch knobs of the cover with
the switches.
Lens
Lever
Knob
Lever
Switch knob Switch

— 13 —
C120
C307
C322
C309
D102
D103
D105 C150
C141
D101
L303
R306
R335
VR301
VR303
VR302
C318
C310
L300
C311 C312 C340
C339 C338
C317
R313
R317
C327
R424
R400
R401
R413
R410
R426
R414 C408
C414
C333 R328
R331 R330
R320
R300
VR300
VR101
FU100
L100
T150
VR100
C300
R301
C112
R110
R111
R121
C111
R114
C110
C303
C301
R333
R142 R141
C316
C121
C123
C125
C144
C100
C153
C101
H300
IC100
C321
R316
R318
R421 Q401
IC300
T100
R420
R403
C409
C401
C402
R412
VR400
R430
R411
R409 R408
C405
C404
R319
CN150
CN100
VR304
1
1
1
1
+
+
+
+
+
+
+
++
+
+
PRINTED CIRCUIT BOARDS
LINEAR
Top View
Bottom View
IC101
IC400
CN400
SW100
1
C412
R321
C413
C140
R151
C151
R150 C142
C152
C145
C406
C407
R100
R427
C329
R113
C143
C126
D106 D104
C122C124
R115
R405
R406
R407
L400
C113
Q103
C146
Q150 Q101
Q100
L103
L102
C335
C313
C323
C305 C320
C334
R304
C302
C304 C319
R315
R314
L301 C325
C326
C336
C324C348
C347
R322R323
C330 R332 R324 R325 R327 R326
R340 C346
C331 C332
C417
R402 R428 C411
C416 C410
R429
C415
R404
C328
R302 R336
R312
R310
C306
R303
C308
R305
R308 C337 R334
R309
R307
C314 C315 R311
C128
C129
L105
R120
C127
IC150
Q102
1
+
+
+
+
+
+

— 14 —
Bottom View
Top View
C527
C607
C631 R603
R631
L641
IC605
C718
L732
R610 R612
C629 R607
R626
R625
C612
C611
C625
EM2
R633
C630
C613
R605
R606
Q610
R517
C521 R509
R516 C517 R629
R630
C523
R515
IC507
C531
CN600
IC505 IC504
C518
D600
L513
L501
C601
C533
C535
C722
L631
C534
C522
R522
R519
R521
T500
JK700
JK500
JK600
C551
L502
L540
L740
L643
IC701
IC703
IC601
CN602CN603
H701 H700
CN601
Q514
Q611
Q508
Q512
C546 C542
C731 C730 C537 C541
C544
C540
C548
+
+
+
+
+
L503
DIGITAL
IC700 IC600
C705
C704
R655
L506
C508
L505
R504
C506
C509
R502
C519 C512
R505
R523
IC502
Q501
Q502
IC501
Q504
Q500 IC500 IC704
R503
C503 C504
IC503
D501
D503
D502
R501
R620 R621 R619
C536
R506 C511
R602 R600
R601
R500
C505
L507
L510
L509
FU500
D506
R508 R507
R518
R706 R707
R705
R711
L734
R714 R713
R708
L600 L601 L602
L620
R615
D603 D604
D601
R617
R622 R624
C721
R614 C627
C602
C608
C529 C528
IC604
IC602
R627
R628
R616
IC603
C623
R703 R702
C547
R514
R640
C626
L508
R623
R530
C543
C530
R520
D500
D504
D505
C507
L511
C545
C714
C715
R608
L630
C525
R512
R511
R510
R513
C524
C600
C707
F700
C609
R527
R641
R632
IC705
IC706
R526
R528
R709
R704
C520
Q505
VR500
C720
D602
C732
C624
IC506
C604
IC702
C605
C603
R611 C526
C606
R700
NR701 NR700
NR703
NR702
R701
+
1
1
1
1
1
1
Q510
Q507
Q506
Q700
Q701 Q702
Q612
Q513 Q503
Q613
Q609
C501
+

— 15 —
EXPLODED VIEW
4
2
3
7
8
1
11
10
28
5
6
13
15
16
19
18
17
20
21
22
24
23 25
26
27
30
30
29
29
29
29 29
12
29
28
29
12-1
25-1
27-1
27-2
27-4
27-5
27-6
27-3
9
31
31
28
14

PARTS LIST
LINEAR PCB ASS'Y
Item Code No. Parts Name Specification Q R
Diodes
D101 7101 1194 Chip diode MA111-(TX) 1 C
D102 2390 1379 Schottoky diode MA729-(TX) 1 C
D103 2390 1379 Schottoky diode MA729-(TX) 1 C
D104 7101 1194 Chip diode MA111-(TX) 1 C
D105 2390 1379 Schottoky diode MA729-(TX) 1 C
D106 2360 2359 Chip zener diode MA8180-L(TX) 1 C
Fuse
FU100 3122 2772 Chip fuse ICP-S0.7TN 1 B
ICs
IC100 2114 3654 IC MB3800PNF-G-BND-EF 1 C
IC101 2114 3654 IC MB3800PNF-G-BND-EF 1 C
IC150 2105 3990 IC TC7S02F-TE85L 1 C
IC300 2114 3633 Linear IC IR3P90Y-1 1 C
IC400 2015 0147 LSI MSM6770CGS-2K-6004 1 C
Transistors
Q100 2253 0308 Chip transistor 2SD1119-R(TX) 1 B
Q101 2253 0308 Chip transistor 2SD1119-R(TX) 1 B
Q102 7911 0126 Digital transistor DTC144EUAT106 1 B
Q150 2253 0700 Chip transistor 2SK1485-T1 1 B
Q401 2251 0189 Chip transistor 2SB1218A-R(TX) 1 B
Switch
SW100 3412 1106 Slide switch SSSS212-12 1 C
Converter and Transformer
T100 3065 0693 DC-DC converter TTV6DD360M02 1 B
T150 3012 1477 Inverter transformer ETJ09K20AM 1 B
Variable resistor
VR304 2775 0644 Semi-fixed resistor H0614D-10KB 1 C
Notes: Q – Quantity used per unit
R – Rank — 16 —

DIGITAL PCB ASS'Y
Item Code No. Parts Name Specification Q R
Diodes
D500 2390 2268 Chip diode MA727-(TX) 1 C
D501 2360 1876 Chip zener diode MA8100-M(TX) 1 C
D502 2390 1379 Schottoky diode MA729-(TX) 1 C
D503 7101 1194 Chip diode MA111-(TX) 1 C
D504 2390 2261 Chip diode MA720-(TX) 1 C
D505 2390 2261 Chip diode MA720-(TX) 1 C
D506 2390 1421 Chip schottoky diode MA738-(TX) 1 C
D600 7101 1194 Chip diode MA111-(TX) 1 C
D601 2390 1379 Schottoky diode MA729-(TX) 1 C
D602 2390 1470 Chip diode MA143A-(TX) 1 C
D603 2390 1379 Schottoky diode MA729-(TX) 1 C
D604 2360 2982 Chip zener diode MA8075-M(TX) 1 C
Fuse
FU500 3632 0700 Chip fuse F1206A1R25FW-TP 1 A
ICs
IC500 2114 3654 IC MB3800PNF-G-BND-EF 1 C
IC501 2105 5985 IC RH5RH353B-T1 1 C
IC502 2105 3969 IC RH5RH503B-T1 1 C
IC503 2105 3689 MOS-IC RN5RG50AA-TR 1 C
IC504 2105 3976 IC RN5RL25AA-TR 1 C
IC505 2105 1407 CMOS-IC TC7S00F-TE85L 1 C
IC506 2105 5215 IC TC7W74FU(TE12L) 1 C
IC507 2105 3983 IC RN5VL32AA-TR 1 C
IC600 2012 5532 LSI HD6437042Y03F 1 C
IC601 2012 4424 LSI HM51W4260CLTT-7 1 C
IC602 2012 4340 LSI KM29V32000T 1 C
IC603 2105 1414 CMOS-IC TC7S04F-TE85L 1 C
IC604 2105 6006 IC RN5VL30AA-TR 1 C
IC605 2105 5719 IC TC7W32FU-TE12L 1 C
IC700 2012 4417 LSI HG51D291FE 1 C
IC701 2012 4354 LSI µPD482445LGW 1 C
IC702 2012 4711 LSI µPD6461GS-644-E1 1 C
IC703 2012 4431 LSI LC99092-Z03 1 C
IC704 2105 5992 IC MM1228XFR 1 C
IC705 2105 6288 IC XC2141C21A 1 C
IC706 2105 5215 IC TC7W74FU(TE12L) 1 C
Jacks
JK500 3501 8281 Jack HEC0811-010010 1 C
JK600 3501 6538 Jack HSJ1169-012010 1 C
JK700 3501 5439 Jack HSJ1456-01-210 1 C
Transistors
Q500 2253 0308 Chip transistor 2SD1119-R(TX) 1 B
Q501 2253 0308 Chip transistor 2SD1119-R(TX) 1 B
Q502 2251 0847 Chip transistor 2SB1386-T100R 1 B
Q503 2251 0189 Chip transistor 2SB1218A-R(TX) 1 B
Q504 2390 2863 Chip FET 2SJ212-T1 1 B
Q505 7911 0126 Digital transistor DTC144EUAT106 1 B
Q506 2251 0189 Chip transistor 2SB1218A-R(TX) 1 B
Q507 7911 0126 Digital transistor DTC144EUAT106 1 B
Q508 2251 0189 Chip transistor 2SB1218A-R(TX) 1 B
Q510 7911 0126 Digital transistor DTC144EUAT106 1 B
Q512 7911 0126 Digital transistor DTC144EUAT106 1 B
Notes: Q – Quantity used per unit
R – Rank — 17 —

Item Code No. Parts Name Specification Q R
Q513 7911 0126 Digital transistor DTC144EUAT106 1 B
Q514 7911 0126 Digital transistor DTC144EUAT106 1 B
Q609 7911 0126 Digital transistor DTC144EUAT106 1 B
Q610 2259 2205 Digital transistor DTA114EUAT106 1 B
Q611 7911 0126 Digital transistor DTC144EUAT106 1 B
Q612 2254 0448 Chip FET 2SK1580-T1 1 B
Q613 2254 0448 Chip FET 2SK1580-T1 1 B
Q700 2253 0133 Chip transistor 2SD1819A-R(TX) 1 B
Q701 2251 0189 Chip transistor 2SB1218A-R(TX) 1 B
Q702 2253 0133 Chip transistor 2SD1819A-R(TX) 1 B
DC-DC converter
T500 3701 0693 DC-DC converter CEE98-05 1 B
Notes: Q – Quantity used per unit
R – Rank — 18 —