Download: 1-4. PW1 POWER CIRCUIT DESCRIPTION

1-4. PW1 POWER CIRCUIT DESCRIPTION 1. Outline 3. Analog System Power Output This is the main power circuit, and is comprised of the follow- 15.2 V (A) and -7.7 V (A) are output. Feedback for the 15.2 V ing blocks. (A) is provided to the switching controller (Pin (28) of IC501) Switching controller (IC501) so that PWM control can be carried out. 5.6 V system power output (L5001, Q5001) 5 V system power output (IC502) 4. Digital 1.8 V Power Output Analog system power output (T5001, Q5002) 1.8 V (D) is output. Feedback for the 1.8 V (D) is provided to Digital 3.4 V system power output (L5005, Q50...
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1-4. PW1 POWER CIRCUIT DESCRIPTION 1. Outline 3. Analog System Power Output This is the main power circuit, and is comprised of the follow- 15.2 V (A) and -7.7 V (A) are output. Feedback for the 15.2 V ing blocks. (A) is provided to the switching controller (Pin (28) of IC501) Switching controller (IC501) so that PWM control can be carried out. 5.6 V system power output (L5001, Q5001) 5 V system power output (IC502) 4. Digital 1.8 V Power Output Analog system power output (T5001, Q5002) 1.8 V (D) is output. Feedback for the 1.8 V (D) is provided to Digital 3.4 V system power output (L5005, Q5010) the switching controller (Pins (31) of IC501) so that PWM Digital 1.8 V system power output (L5007, Q5014) control can be carried out. 2. Switching Controller 5. Digital 3.4 V Power Output This is the basic circuit which is necessary for controlling the 3.4 V (D) is output. Feedback for the 3.4 V (D) is provided to power supply for a PWM-type switching regulator, and is pro- the swiching controller (Pin (8) of IC501) so that PWM control vided with six built-in channels, only CH3 (analog system), can be carried out. CH2 (digital 1.8 V), CH5 (digital 3.4 V) and CH6 (5.6 V sys- tem) are used. CH1 and CH4 are not used. Feedback from 6. 5.6 V System Power Output 15.2 V (A) (CH1), 1.8 V (D) (CH2), 3.4 V (D) (CH5) and 5.6 V 5.6 V is output. Feedback is provided to the swiching control- (CH6) power supply outputs are received, and the PWM duty ler (Pin (4) of IC501) so that PWM control can be carried out. is varied so that each one is maintained at the correct voltage setting level. 2-1. Short-circuit Protection If output is short-circuited for the length of time determined by the condenser which is connected to Pin (18) of IC501, all output is turned off. The control signal (P ON) are recontrolled to restore output. – 6 –, 1-5. PW1 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 becomes High (3.3 V), the charging circuit starts sion port, the stroboscope emits light. 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, Q5406 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- L5401 and C5401 constitute the power supply filter. They erated inside the trigger circuit, and this pulse is then applied smooth out ripples in the current which accompany the switch- to the light emitting part. ing of the 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 C5144 on the CA3 board. 1-6. Voltage monitoring circuit This circuit is used to maintain the voltage accumulated at C5144 at a constance level. After the charging voltage is divided and converted to a lower voltage by R5417 and R5419, 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. – 7 –, 1-6. 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 power ON/OFF H : ON 9 VSS - GND 10 VDD - VDD 11 SELF_LED O Self-timer LED 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 write receiving data 19 PRG SO O Flash memory write sending data 20 PRG SCK I/O Flash memory write communication clock 21 AV JACK I AV jack connection detection H : AV JACK detection 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 NOT USED - - 31 DC_IN I DC JACK/battery detection input (analog input) 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 JOG0IJog shuttle input 0 46 SCAN_IN5 I Key scan input 5 47 JOG1IJog shuttle input 1 48 RSENS1IInclination sensor input1L: Inclination detection (left) See next page → – 8 –, 49 BR OPEN O Barrier open control H : Open 50 RSENS0IInclination sensor input0L: Inclination detection (right) 51 CARD I CF card insertion detection L : Insertion 52 BUZZER O Buzzer beep tone output L : Pulse output 53 SCAN IN4IKey scan input 4 54 SCAN OUT4OKey scan output 4 55 WAKE UP I - 56 SYMUTE O Audio mute control L : Mute 57 USB I USB connector detection L : USB detecion 58 NOT USED - - 59 NOT USED - - 60 BR CLOSE O Barrier close control L : Close 61 NOT USED - - 62 ASIC TEST O ASIC reset control signal1L: Reset 63 ASIC RESET O ASIC reset control signal2L: Reset 64 MAIN RESET O Main CPU reset singal L : Reset Table 4-1. 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. 4-1 shows the internal commu- nication between the 8-bit microprocessor, ASIC and SPARC lite circuits. MAIN RESET S. REQ 8-bit ASIC SO CPU Microprocessor ASIC SI ASIC SCK ASIC TEST ASIC RESET Fig. 4-1 Internal Bus Communication System 3. Key Operation For details of the key operation, refer to the instruction manual.

SCAN

SCAN IN012345

OUT

0 ← LEFT ↑ UP → RIGHT ↓ DOWN 1st shutter 2nd shutter 1 TELE WIDE REC MODE REC MODEPLAY MODE (LCD OFF) (LCD ON) - 2 MODE SET INFO FLASH MODE BARRIER OPEN BARRIERCLOSE 3 STILL IMAGE SEQUENTIAL VIDEO CLIPSHOT SHOOTING SET UP PC MODE TEST 4 - - - - - POWER ON Table 4-2. Key Operation – 9 –, 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 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 (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 5V (L) Power voltage 3.3 V +12 V etc. (ALWAYS) +12V etc. 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 – 10 –]
15

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2-3. BOARD LOCATION TB1 board CA1 board CP1 board ST2 board TB2 board ST3 board ST1 board – 11 – 3. ELECTRICAL ADJUSTMENT 3-1. Table for Servicing Tools 3-3. Adjustment Items and Order 1. IC501 Oscillation Frequency Adjustment Ref. No. Name Number Part code 2. Lens Adjustment J-1 Pattern box (color