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 microprocessor becomes High (3.3 V), the sion port, the stroboscope emits light. charging circuit starts operating and the main electorolytic capacitor 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 ...
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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 microprocessor becomes High (3.3 V), the sion port, the stroboscope emits light. charging circuit starts operating and the main electorolytic capacitor 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 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 mi- croprocessor as the monitoring voltage VMONIT. When this VMONIT voltage reaches a specified level at the micropro- cessor, the CHG signal is switched to Low and charging is interrupted. – 5 –, 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 Signal I/O Outline 1~3 /SCAN OUT 0~2 O Key scan output 4 /SCAN OUT3OLens barrier open/close detection switch for scan output5PON O Digital power ON/OFF control H : ON 6 PA ON O Analog power ON/OFF control H : ON 7 /STILL_LED O Still image mode LED (orange) control L : ON 8 /CSTILL_LED O Video clip mode LED (orange) control L : ON 9 VSS - GND 10 VDD - VDD 11 /MOVIE_LED O Video clip mode LED (orange) control L : ON 12 /STBY_LED (GREEN) O Stand-by LED (green) control L : ON 13 /STBY_LED (RED) O Stand-by LED (red) 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 writing receiving data 19 PRG SO O Flash memory writing sending data 20 PRG SCK I/O Flash memory writing communication clock 21 LCD_ON O LCD power ON/OFF control1H: ON 22 BLON O LCD backlight ON/OFF control H : ON 23 CHG ON O Flash charge control H : ON 24 VDD - VDD 25 AVSS - AVSS 26~29 SCAN IN 0~3 I Key scan input 30 INT_TEMP 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 (37.768 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 CLOSE I Lens barrier close detection switch input 47 /DC_IN I DC jack/battery detection input See next page → – 6 –, 48 BOOT I/O Compulsion boot control L : DC JACK detection 49 AV JACK I AV jack connection detection H : AV jack detection 50 OPEN I Lens barrier open detection switch input 51 /CARD I SD card insertion detection L : Insertion 52 NOT USED - - 53 LCD ON2 O LCD power ON/OFF control 2 54 /SCAN_IN4IKey scan input 4 55 /SCAN_IN5IKey scan input 5 56 /BACKUP_CNT O Backup battery charge control L : Charge ON 57 /USB I USB connector detection L : USB detecion 58 BR_OPEN O Lens barrier open control H : Open 59 BR CLOSE O Lens barrier close control H : Close 60 CLKSEL0OCPU clock ON/OFF control H : ON 61 CLKSEL1OCPU clock swtich control 62 PLLEN O PLL reset signal L : RESET 63 ZTEST O ASIC reset signal L : RESET 64 /ASIC RESET O CPU reset singal L : RESET Table 5-1. 8-bit Microprocessor Port Specification 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 ASIC SO ASIC Microprocessor ASIC SI ASIC SCK

PLLEN

CLKSEL0 CLKSEL1 Fig. 5-1 Internal Bus Communication System 3. Key Operaiton For details of the key operation, refer to the instruction manual.

SCAN

SCAN IN126OUT03450← LEFT ↑ UP ↓ DOWN → RIGHT WIDE TELE TEST 1 MODE MENU FLASH SET 1st SHUTTER 2nd SHUTTER 2 REC REC (VF) PC CAM PLAY OPTION COM POWER OFF Table 5-2. Key Operation – 7 –, 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, 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, 8 bit LCD

CCD

memory CPU MONITOR5V(A) 3.2 V Power voltage 3.3 V +15 V (L) +15 V (A) 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. 16-bit D/A circuit (Audio) This circuit converts the audio signals (analog signals) from the microphone to 16-bit digital signals. 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 –, 2. DISASSEMBLY 2-1. REMOVAL OF CABINET BACK, CABINET FRONT, CA1 BOARD, TB2 BOARD AND TB1 BOARD

B

A477

A B

1 1. Two screws 1.7x42. Two screws 1.7 x 3.5263. Three screws 1.7x54. FPC 5. Cabinet back 6. Screw 1.7 x 3.5 12 7. Three FPCs 8. Screw 1.7 x 3.5 28 9. Connector 10. Cabinet left 27 11. Cover jack 14 12. Cabinet front 29 20 19 13 21 17 21. Assy motor 13. Two screws 1.7x422. Lever cover lens 14. Screw 1.7 x 4.5 23. Two screws 1.7 x 3.5 15. FPC 24. Cabi front inner 16. Screw 1.7 x 4.5 25. Cover lens 17. TB2 board 26. Cabinet front 26 18. Connector 27. FFC 19. Two screws 1.7x428. Two screws 1.7x420. Connector 29. TB1 board – 9 –, 2-2. REMOVAL OF LCD, CP1 BOARD, ST1 BOARD AND ST2 BOARD

C

11 redD 1075white943redC6

D

white 8 12 1. Spacer FPC 15 2. FPC 3. LCD 4. Screw 1.7x35. Screw 1.7 x 3.5 gray (deep) 6. Holder monitor G pink (light) 7. Two screws 1.7 x 3.5 gray (light) white 8. Two screws 1.7 x 3.5 F21 9. Holder terminal 10. Holder USB 11. CP1 board

E

12. FPC 18 black 13. Screw 1.7 x 3.5 14. Screw 1.7x315. Holder PWB gray (deep) pink (deep) G 19 16. Three screws 1.7 x 3.5 pink (light) 20 17. ST1 board

F

18. Screw 1.7 x 3.5 19. ST3 board blue 20. Stand 17 E 21. Screw 1.7 x 3.5 white 22. ST2 board 16 black red – 10 –]
15

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