1-4. ST1 STROBE CIRCUIT DESCRIPTION
1. Charging Circuit
When UNREG power is supplied to the charge circuit and the
CHG signal from SY1 board 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 C5412.
1-6. Voltage monitoring circuit
This circuit is used to maintain the voltage accumulated at
C5412 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 SY1
circuit board as the monitoring voltage VMONIT. When this
VMONIT voltage reaches a specified level at the SY1 circuit
board, the CHG signal is switched to Low and charging is
interrupted.
– 6 –
1-5. SY1 CIRCUIT DESCRIPTION
1. Configuration and Functions
For the overall configuration of the SY1 circuit board, refer to the block diagram. The SY1 circuit board 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
1~4
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 3~0
30
31 NOT USED
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
STBY_LED (GREEN)
Signal
SCAN OUT 0~3
P ON
PA ON
LCD ON
BL_ON
VSS
VDD
SELF_LED
STBY_LED (RED)
AVREF_ON
SI
SO
SCK
PRG SI
PRG SO
PRG SCK
NOT USED
NOT USED
CHG ON
INT_TMP
CHG VOL
BATTERY
AVREF
AVDD
RESET
XCOUT
XCIN
IC
XOUT
XIN
VSS
BAT OFF
SREQ
SCAN IN6
INTP3
NOT USED
BOOT
I/O
O
O
O
O
O
O
O
O
O
O
I/O
O
I/O
O
O
O
I/O
Outline
Key matrix output
Digital power ON/OFF control H : ON
Analog power ON/OFF control H : ON
LCD power ON/OFF control H : ON
LCD backlight ON/OFF
-
-
I
I
-
-
-
-
I
I
-
I
I
-
-
I
I
I
I
-
I
I
I
I
-
GND
VDD
Self-timer LED 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 write receiving data
Flash memory write sending data
Flash memory write communication clock
-
-
Flash charge control H : ON
VDD
Analog GND
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 (32.768 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
-
-
Compulsion boot control
See next page →
– 7 –
49 AV JACK
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
DC IN
CARD
BUZZER
SCAN OUT 4
SCAN IN 4
SCAN IN 5
SUB1
USB
LCD ON2 O
NTZPAL O NTSC/PAL switch H : NTSC
BACKUP_CNT
ASIC TEST 0
ASIC TEST 1
ASIC TEST 2
ASIC RESET
I
O DC jack/battery detection input (analog input) L : DC jack insertion
I
O
I
O
I
I/O
I
O
O ASIC reset control signal 0
O ASIC reset control signal 1
O
O
Table 5-1. 8-bit Microprocessor Port Specification
AV jack connection detection H : AV jack detection
CF card insertion detection L : Insertion
Buzzer beep tone output H : Pulse output
Key scan output 4
Key scan input 4
Key scan input 5
Communication line to main
USB connector detection L : USB detecion
LCD ON/OFF control 2 H : ON
Backup battery charge control L : Charge ON
ASIC reset control signal 2
ASIC reset singal
2. Internal Communication Bus
The SY1 circuit board 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.
ASIC RESET
S. REQ
8-bit
Microprocessor
Fig. 5-1 Internal Bus Communication System
ASIC SO
ASIC SI
ASIC SCK
ASIC TEST 1
ASIC TEST 2
ASIC TEST 0
3. Key Operaiton
For details of the key operation, refer to the instruction manual.
SCAN
OUT
SCAN
IN
0
1
2
3
0
← LEFT
PLAY
-
WEB
-
1
↑ UP
VF
-
DC MODE
-4
2
↓ DOWN
LCD
TEST
SET UP
-
3
→ RIGHT
WIDE
FOCUS
VIDEO CLIP
SHOOTING
-
4
MENU
TELE
FLASH
SEQUENTIAL
SHOT
-
ASIC
5
SET
-
1st
STILL IMAGE
-
6
-
-
2nd
-
POWER ON
Table 5-2. Key Operation
– 8 –
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 capacitor. 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, low signals are output from pins (61), (62), (63) and (64) so that the ASIC is set to the reset condition.
After this these pins set to high, and set to active condition. If the LCD monitor is on, the LCD ON 2 signal at pin (58) 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 5-3. Camera Mode (Battery Operation)
Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation
3.3 V 1.8 V
OFF
OFF
ON
OFF
ON
ON
CCD
5 V (A)
+12 V etc.
OFF
OFF
ON → 2 OFF
OFF
ON
OFF
(ALWAYS)
5. 8-bit D/A circuit (Audio)
This circuit converts the audio signals (analog signals) from the microphone to 8-bit digital signals.
8 bit
CPU
3.2 V
32KHz OFF
4 MHz OFF
4 MHz OFF
4 MHz OFF
4 MHz ON
4 MHz ON
LCD
MONITOR
5 V (L)
+8.5 V etc.
6. 8-bit A/D circuit (Audio)
The audio signals which were converted to digial form by the 8-bit A/D circuit are temporarily to a sound buffer and then recorded
in the SSFDC card. During playback, the 8-bit D/A circuit converts these signals into analog audio signals.
– 9 –
2. DISASSEMBLY
5
1
2
3
2
4
5
6
7
8
9
10
11
12
2-1. REMOVAL OF CABINET FRONT, CABINET BACK AND CABINET TOP
8
1. Six screws 1.7 x 2.5
2. Three screws 1.7 x 4
3. Four screws 1.7 x 2
4. Cabinet front
5. Cabinet back
6. FPC
7. Screw 1.7 x 2.5
8. Cabinet top
7
5
3
6
1
4
2
1
3
1
NOTE: Do not touch the holder cabi lock.
1
2
2
1
Because they change the shape
and get injured.
2-2. REMOVAL OF SY1 BOARD AND LCD
1. Two screws 1.7 x 3
2. Two connector
3. Connector
4. SY1 board
5. Four screws 1.7 x 3
6. Screw 1.7 x 3
7. Holder card
8. Holder monitor
9. FPC
10. Connector
11. LCD
12. Screw 1.7 x 4
NOTE: Attach the button buttery + side is
the bottom (Z3001 of SY1 board).
– 10 –
2-3. REMOVAL OF PW1 BOARD, CA2 BOARD, ST1 BOARD AND CA1 BOARD
11
1. FPC
2. Screw 1.7 x 3
3. Screw 1.7 x 4
4. Holder battery
5. Connector
6. ST1 board
7. Three screws 1.7 x 3
8. FPC
9. Connector
10. PW1 board
11. Four screws 1.7 x 3
12. Holder terminal
13. CA2 board
14. Spacer CA1
15. Two screws 1.4 x 3.5
16. CA1 board
17. Three screws 1.7 x 4
18. Holder lens
10
2
7
4
3
6
12
9
1
8
5
17
11
13
14
2-4. BOARD LOCATION
18
15
16
17
SY1 board
ST1 board
PW1 board
CA2 board
CA1 board
– 11 –
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