Download: 1-4. ST1 STROBE CIRCUIT DESCRIPTION

1-4. ST1 STROBE CIRCUIT DESCRIPTION 1. Charging Circuit 2. Light Emission Circuit When UNREG power is supplied to the charge circuit and the When RDY and TRIG signals are input from the ASIC expan- CHG signal from SY1 board becomes High (3.3 V), the charg- sion port, the stroboscope emits light. ing circuit starts operating and the main electorolytic capaci- tor is charged with high-voltage direct current. 2-1. Emission control circuit However, when the CHG signal is Low (0 V), the charging When the RDY signal is input to the emission control circuit, circuit does not operate. Q5409 switches o...
Author: Folver Shared: 8/19/19
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1-4. ST1 STROBE CIRCUIT DESCRIPTION 1. Charging Circuit 2. Light Emission Circuit When UNREG power is supplied to the charge circuit and the When RDY and TRIG signals are input from the ASIC expan- CHG signal from SY1 board becomes High (3.3 V), the charg- sion port, the stroboscope emits light. ing circuit starts operating and the main electorolytic capaci- tor is charged with high-voltage direct current. 2-1. Emission control circuit However, when the CHG signal is Low (0 V), the charging When the RDY signal is input to the emission control circuit, circuit does not operate. Q5409 switches on and preparation is made to let current flow to the light emitting element. Moreover, when a STOP 1-1. Power switch signal is input, the stroboscope stops emitting light. When the CHG signal switches to Hi, Q5407 turns ON and the charging circuit starts operating. 2-2. Trigger circuit When a TRIG signal is input to the trigger circuit, D5405 1-2. Power supply filter switches on, a high-voltage pulse of several kilovolts is gen- C5401 constitutes the power supply filter. They smooth out erated inside the trigger circuit, and this pulse is then applied ripples in the current which accompany the switching of the to the light emitting part. oscillation transformer. 2-3. Light emitting element 1-3. Oscillation circuit When the high-voltage pulse form the trigger circuit is ap- This circuit generates an AC voltage (pulse) in order to in- plied to the light emitting part, currnet flows to the light emit- crease the UNREG power supply voltage when drops in cur- ting element and light is emitted. rent occur. This circuit generates a drive pulse with a frequency of approximately 50-100 kHz. Because self-excited light omis- Beware of electric shocks. sion is used, the oscillation frequency changes according to the drive conditions. 1-4. Oscillation transformer The low-voltage alternating current which is generated by the oscillation control circuit is converted to a high-voltage alter- nating 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 high- voltage direct current and is accumulated at electrolytic ca- pacitor 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 Signal I/O Outline 1~4 SCAN OUT 0~3 O Key matrix output5PON O Digital power ON/OFF control H : ON 6 PA ON O Analog power ON/OFF control H : ON 7 LCD ON O LCD power ON/OFF control H : ON 8 BL_ON O LCD backlight ON/OFF 9 VSS - GND 10 VDD - VDD 11 SELF_LED O Self-timer LED control L : ON 12 STBY_LED (RED) O Stand-by LED (red) control L : ON 13 STBY_LED (GREEN) O Stand-by LED (green) control L : ON 14 AVREF_ON O A/D converter standard voltage control L : ON 15 SI I Receiving data (from ASIC) 16 SO O Sending data (to ASIC) 17 SCK I/O Communication clock (to ASIC) 18 PRG SI I Flash memory write receiving data 19 PRG SO O Flash memory write sending data 20 PRG SCK I/O Flash memory write communication clock 21 NOT USED - - 22 NOT USED - - 23 CHG ON O Flash charge control H : ON 24 VDD - VDD 25 AVSS - Analog GND 26~29 SCAN IN 3~0 I Key scan input 30 INT_TMP I Internal temperature detection input (analog input) 31 NOT USED - - 32 CHG VOL I Storobe charge voltage detection (analog input) 33 BATTERY I Battery voltage detection (analog input) 34 AVREF - Analog standard voltage input terminal 35 AVDD - A/D converter analog power terminal 36 RESET I Reset input 37 XCOUT O Clock oscillation terminal (32.768 kHz) 38 XCIN I Clock oscillation terminal 39 IC I Flash memory writing voltage 40 XOUT O Main clock oscillation terminal (4MHz) 41 XIN I Main clock oscillation terminal 42 VSS - GND 43 BAT OFF I Battery OFF detection 44 SREQ I Serial communication requirement (from ASIC) 45 SCAN IN6 I Key scan input 6 46 NOT USED - - 47 NOT USED - - 48 BOOT I/O Compulsion boot control See next page → – 7 –, 49 AV JACK I AV jack connection detection H : AV jack detection 50 DC IN O DC jack/battery detection input (analog input) L : DC jack insertion 51 CARD I CF card insertion detection L : Insertion 52 BUZZER O Buzzer beep tone output H : Pulse output 53 SCAN OUT4IKey scan output 4 54 SCAN IN4OKey scan input 4 55 SCAN IN5IKey scan input 5 56 WAKE UP O CPU sleep recovery signal 57 USB I USB connector detection L : USB detecion 58 NOT USED - - 59 NOT USED - - 60 BACKUP_CNT O Backup battery charge control L : Charge ON 61 AUDRST O Audio reset control signal H : RESET 62 ASIC TEST O ASIC reset control signal L : RESET 63 ASIC RESET O ASIC reset control signal L : RESET 64 MAIN RESET O CPU reset singal L : RESET Table 5-1. 8-bit Microprocessor Port Specification 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 communi- cation between the 8-bit microprocessor, ASIC and SPARC lite circuits. MAIN RESET S. REQ 8-bit ASIC SO ASIC Microprocessor ASIC SI ASIC SCK ASIC TEST ASIC RESET Fig. 5-1 Internal Bus Communication System 3. Key Operaiton For details of the key operation, refer to the instruction manual.

SCAN

SCAN IN OUT01234560← LEFT ↑ UP ↓ DOWN → RIGHT MENU SET - 1 PLAY VF LCD WIDE TELE - - 2 - - TEST FOCUS FLASH 1st 2nd 3 WEB DC MODE SET UP VIDEO CLIP SEQUENTIALSHOOTING SHOT STILL IMAGE - 4 - - - - - - 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 micro- processor 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, low signals are output from pins (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 (7) 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, 8 bit LCD

CCD

memory CPU MONITOR5V(A) 3.2 V Power voltage 3.3 V +8.5V (L) +12 V etc. (ALWAYS) Power OFF OFF OFF 32KHz OFF Power switch ON- OFF OFF 4 MHz OFF Auto power OFF Shutter switch ON ON ON→OFF 4 MHz OFF

CAMERA

Monitor OFF OFF OFF 4 MHz OFF LCD finder ON ON 4 MHz ON Play back ON OFF 4 MHz ON Table 4-3. Camera Mode (Battery Operation) Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation 5. 8-bit D/A circuit (Audio) This circuit converts the audio signals (analog signals) from the microphone to 8-bit digital signals. 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 2-1. REMOVAL OF CABINET FRONT, CABINET BACK AND CABINET TOP 1. Six screws 1.7 x 2.5 2. Three screws 1.7x43. Four screws 1.7x24. Cabinet front 5. Cabinet back 6. FPC 7. Screw 1.7 x 2.5 5 8. Cabinet top321NOTE: Do not touch the holder cabi lock. Because they change the shape 2 and get injured. 2-2. REMOVAL OF SY1 BOARD AND LCD 4 NOTE: Attach the button buttery + side is 1. Two screws 1.7x32the bottom (Z3001 of SY1 board). 2. Two connector 2 3. Connector 4. SY1 board 5 5. Four screws 1.7x311 6. Screw 1.7x37. Holder card 8. Holder monitor 9 9. FPC 10. Connector 11. LCD 10 12. Screw 1.7x45– 10 –, 2-3. REMOVAL OF PW1 BOARD, CA2 BOARD, ST1 BOARD AND CA1 BOARD 1. FPC 2. Screw 1.7x33. Screw 1.7x44. Holder battery 11 5. Connector 6. ST1 board 10 7. Three screws 1.7x3213 8. FPC 9. Connector 1 10. PW1 board 11. Four screws 1.7x312. Holder terminal 13. CA2 board 14. Spacer CA14615. Two screws 1.4 x 3.5 16. CA1 board3517. Three screws 1.7x418. Holder lens 2-4. BOARD LOCATION SY1 board ST1 board PW1 board CA2 board CA1 board – 11 –]
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