Page 1
1-4. ST1 STROBE CIRCUIT DESCRIPTION
1. Charging Circuit
When UNREG power is supplied to the charge circuit and the
CHG signal from microprocessor becomes High (3.3 V), the
charging circuit starts operating and the main electorolytic
capacitor is charged with high-voltage direct current.
However, when the CHG signal is Low (0 V), the charging
circuit does not operate.
1-1. Power switch
When the CHG signal switches to Hi, Q5407 turns ON and
the charging circuit starts operating.
1-2. Power supply filter
C5401 constitutes the power supply filter. They smooth out
ripples in the current which accompany the switching of the
oscillation transformer.
1-3. Oscillation circuit
This circuit generates an AC voltage (pulse) in order to increase the UNREG power supply voltage when drops in current occur. This circuit generates a drive pulse with a frequency
of approximately 50-100 kHz. Because self-excited light omission is used, the oscillation frequency changes according to
the drive conditions.
2. Light Emission Circuit
When RDY and TRIG signals are input from the ASIC expansion port, the stroboscope emits light.
2-1. Emission control circuit
When the RDY signal is input to the emission control circuit,
Q5409 switches on and preparation is made to let current
flow to the light emitting element. Moreover, when a STOP
signal is input, the stroboscope stops emitting light.
2-2. Trigger circuit
When a TRIG signal is input to the trigger circuit, D5405
switches on, a high-voltage pulse of several kilovolts is generated inside the trigger circuit, and this pulse is then applied
to the light emitting part.
2-3. Light emitting element
When the high-voltage pulse form the trigger circuit is applied to the light emitting part, currnet flows to the light emitting element and light is emitted.
Beware of electric shocks.
1-4. Oscillation transformer
The low-voltage alternating current which is generated by the
oscillation control circuit is converted to a high-voltage alternating current by the oscillation transformer.
1-5. Rectifier circuit
The high-voltage alternating current which is generated at
the secondary side of T5401 is rectified to produce a highvoltage direct current and is accumulated at electrolytic capacitor C5512.
1-6. Voltage monitoring circuit
This circuit is used to maintain the voltage accumulated at
C5512 at a constance level.
After the charging voltage is divided and converted to a lower
voltage by R5417, R5419 and R5420, it is output to the microprocessor as the monitoring voltage VMONIT. When this
VMONIT voltage reaches a specified level at the microprocessor, the CHG signal is switched to Low and charging is
interrupted.
– 5 –
Page 2
1-5. SYA CIRCUIT DESCRIPTION
1. Configuration and Functions
For the overall configuration of the SYA block, refer to the block diagram. The SYA block centers around a 8-bit microprocessor
(IC301), and controls camera system condition (mode).
The 8-bit microprocessor handles the following functions.
1. Operation key input, 2. Clock control and backup, 3. Power ON/OFF, 4. Storobe charge control, 5. Signal input and output for
zoom and lens control.
Pin
1~3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24 VDD
25 AVSS
26~29 SCAN IN 0~3
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
/STBY_LED (GREEN)
Signal
/SCAN OUT 0~2
/SCAN OUT 3
P ON
PA ON
/STILL_LED
/CSTILL_LED
VSS
VDD
/MOVIE_LED
/STBY_LED (RED)
/AVREF_ON
SI
SO
SCK
PRG SI
PRG SO
PRG SCK
LCD_ON
BLON
CHG ON
INT_TEMP
NOT USED
CHG VOL
BATTERY
AVREF
AVDD
/RESET
XCOUT
XCIN
IC
XOUT
XIN
VSS
/BAT OFF
/SREQ
/SCAN IN6
CLOSE
/DC_IN
I/O
O
O
O
O
O
O
O
O
O
O
O
I/O
O
I/O
O
O
O
O
O
Outline
Key scan output
Lens barrier open/close detection switch for scan output
Digital power ON/OFF control H : ON
Analog power ON/OFF control H : ON
Still image mode LED (orange) control L : ON
Video clip mode LED (orange) control L : ON
-
-
I
I
-
-
I
I
-
I
I
-
-
I
I
I
I
-
I
I
I
I
I
GND
VDD
Video clip mode LED (orange) control L : ON
Stand-by LED (green) control L : ON
Stand-by LED (red) control L : ON
A/D converter standard voltage control L : ON
Receiving data (from ASIC)
Sending data (to ASIC)
Communication clock (to ASIC)
Flash memory writing receiving data
Flash memory writing sending data
Flash memory writing communication clock
LCD power ON/OFF control 1 H : ON
LCD backlight ON/OFF control H : ON
Flash charge control H : ON
VDD
AVSS
Key scan input
Internal temperature detection input (analog input)
-
Storobe charge voltage detection (analog input)
Battery voltage detection (analog input)
Analog standard voltage input terminal
A/D converter analog power terminal
Reset input
Clock oscillation terminal (37.768 kHz)
Clock oscillation terminal
Flash memory writing voltage
Main clock oscillation terminal (4MHz)
Main clock oscillation terminal
GND
Battery OFF detection
Serial communication requirement (from ASIC)
Key scan input 6
Lens barrier close detection switch input
DC jack/battery detection input
See next page →
– 6 –
Page 3
48
49
50
51
52
53
54
55
56
57
58 BR_OPEN
59
60
61
62
63
64
BOOT
AV JACK I
OPEN
/CARD
NOT USED
LCD ON2
/SCAN_IN 4
/SCAN_IN 5
/BACKUP_CNT
/USB
BR CLOSE O Lens barrier close control H : Close
CLKSEL 0
CLKSEL 1
PLLEN
ZTEST
/ASIC RESET
I/O
I Lens barrier open detection switch input
I
-
O
I
I
O
I
O
O
O CPU clock swtich control
O PLL reset signal L : RESET
O
O
Table 5-1. 8-bit Microprocessor Port Specification
Compulsion boot control L : DC JACK detection
AV jack connection detection H : AV jack detection
SD card insertion detection L : Insertion
-
LCD power ON/OFF control 2
Key scan input 4
Key scan input 5
Backup battery charge control L : Charge ON
USB connector detection L : USB detecion
Lens barrier open control H : Open
CPU clock ON/OFF control H : ON
ASIC reset signal L : RESET
CPU reset singal L : RESET
2. Internal Communication Bus
The SYA block carries out overall control of camera operation by detecting the input from the keyboard and the condition of the
camera circuits. The 8-bit microprocessor reads the signals from each sensor element as input data and outputs this data to the
camera circuits (ASIC) or to the LCD display device as operation mode setting data. Fig. 5-1 shows the internal communication
between the 8-bit microprocessor, ASIC and SPARC lite circuits.
ZTEST
ASIC RESET
S. REQ
8-bit
Microprocessor
Fig. 5-1 Internal Bus Communication System
ASIC SO
ASIC SI
ASIC SCK
PLLEN
CLKSEL0
CLKSEL1
3. Key Operaiton
For details of the key operation, refer to the instruction manual.
SCAN
OUT
SCAN
IN
0
1
2
0
← LEFT
MODE
REC
1
↑ UP
MENU
REC (VF)
2
↓ DOWN
FLASH
PC CAM
3
→ RIGHT
SET
PLAY
4
WIDE
1st SHUTTER
OPTION
ASIC
5
TELE
2nd SHUTTER
COM
6
TEST
POWER OFF
Table 5-2. Key Operation
– 7 –
Page 4
4. Power Supply Control
The 8-bit microprocessor controls the power supply for the overall system.
The following is a description of how the power supply is turned on and off. When the battery is attached, a regulated 3.2 V
voltage is normally input to the 8-bit microprocessor (IC301) by IC302, so that clock counting and key scanning is carried out
even when the power switch is turned off, so that the camera can start up again. When the battery is removed, the 8-bit microprocessor operates in sleep mode using the backup lithium secondary battery. At this time, the 8-bit microprocessor only carries
out clock counting, and waits in standby for the battery to be attached again. When a switch is operated, the 8-bit microprocessor
supplies power to the system as required.
The 8-bit microprocessor first sets both the P (A) ON signal at pin (6) and the P ON signal at pin (5) to high, and then turns on the
DC/DC converter. After this, high signals are output from pins (60), (61), (62), (63) and (64) so that the ASIC is set to the active
condition. If the LCD monitor is on, the LCD ON signal at pin (21) and the LCD ON 2 signal at pin (53) set to high, and the DC/DC
converter for the LCD monitor is turned on. Once it is completed, the ASIC returns to the reset condition, all DC/DC converters
are turned off and the power supply to the whole system is halted.
ASIC,
memory
Power voltage
Power OFF
Power switch ON-
Auto power OFF
Shutter switch ON
CAMERA
Monitor OFF
LCD finder
Play back
Table 4-3. Camera Mode (Battery Operation)
Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation
3.3 V
OFF
OFF
ON
OFF
ON
ON
CCD
5 V (A)
+15 V (A) etc.
OFF
OFF
ON→OFF
OFF
ON
OFF
3.2 V
(ALWAYS)
32KHz OFF
4 MHz OFF
4 MHz OFF
4 MHz OFF
4 MHz ON
4 MHz ON
5. 16-bit D/A circuit (Audio)
This circuit converts the audio signals (analog signals) from the microphone to 16-bit digital signals.
8 bit
CPU
LCD
MONITOR
+15 V (L)
6. 16-bit A/D circuit (Audio)
The audio signals which were converted to digial form by the 16-bit A/D circuit are temporarily to a sound buffer and then
recorded in the SSFDC card. During playback, the 16-bit D/A circuit converts these signals into analog audio signals.
– 8 –
Page 5
2. DISASSEMBLY
2-1. REMOVAL OF CABINET BACK, CABINET FRONT, CA1 BOARD, TB2 BOARD AND TB1 BOARD
9
10
B
A
3
7
11
7
A
B
7
4
2
5
8
1
1. Two screws 1.7 x 4
2. Two screws 1.7 x 3.5
2
6
3. Three screws 1.7 x 5
4. FPC
5. Cabinet back
6. Screw 1.7 x 3.5
12
7. Three FPCs
8. Screw 1.7 x 3.5
28
28
27
14
9. Connector
10. Cabinet left
11. Cover jack
12. Cabinet front
24
29
26
25
20
18
19
21
22
23
13. Two screws 1.7 x 4
14. Screw 1.7 x 4.5
15. FPC
16. Screw 1.7 x 4.5
17. TB2 board
18. Connector
19. Two screws 1.7 x 4
20. Connector
15
13
16
17
21. Assy motor
22. Lever cover lens
23. Two screws 1.7 x 3.5
24. Cabi front inner
25. Cover lens
26. Cabinet front
27. FFC
28. Two screws 1.7 x 4
29. TB1 board
– 9 –
Page 6
2-2. REMOVAL OF LCD, CP1 BOARD, ST1 BOARD AND ST2 BOARD
11
10
9
8
7
1
2
C
D
5
white
4
red
3
8
14
1. Spacer FPC
2. FPC
3. LCD
4. Screw 1.7 x 3
5. Screw 1.7 x 3.5
6. Holder monitor
7. Two screws 1.7 x 3.5
8. Two screws 1.7 x 3.5
9. Holder terminal
10. Holder USB
11. CP1 board
12. FPC
13. Screw 1.7 x 3.5
14. Screw 1.7 x 3
15. Holder PWB
red
pink (light)
gray (light)
21
gray (deep)
pink (deep)
15
18
C
D
6
white
13
12
gray (deep)
22
G
white
F
E
black
G
19
16. Three screws 1.7 x 3.5
17. ST1 board
18. Screw 1.7 x 3.5
19. ST3 board
20. Stand
21. Screw 1.7 x 3.5
22. ST2 board
pink (light)
17
white
16
black
20
F
blue
E
red
– 10 –
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