Sanyo VPC-S60 Service Manual

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Contents

– 11 –ASIC,memory CCD 8bitCPULCDMONITORPower supply voltagePower OFFPlayback modeShootingUSB connection1.20 V, 3.25 V 12 V, -7.5 V3.25 V 3.2 V 3.25 VOFF OFF 32 KHz OFFON OFF 4 MHz ONON OFF 4 MHz ONON ON 4 MHz ONON OFF 4 MHz OFFTable 5-3. Power supply controlShooting mode (LCD)4. Power Supply ControlThe 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, IC501 is operating andcreating 3.6 V, a regulated 3.2 V voltage is normally input to the 8-bit microprocessor (IC301) by IC302, clock counting and keyscanning is carried out even when the power switch is turned off, so that the camera can start up again.When the power switch is off, the 8-bit microprocessor halts 4 MHz of the main clock, and operates 32.768 kHz of subclock.When the battery is removed, the 8-bit microprocessor power switches the lithum secondary battery for memory backup byIC302, and operates at low consumption. At this condition, the 8-bit microprocessor halts 4 MHz of the main clock, and operates32.768 kHz clock counting by subclock.Also, the battery for backup is charged 10 hours from it to be attached.When the power switch is on, the 8-bit microprocessor starts processing. The 8-bit microprocessor first sets both the PON signalat pin (30) and the PAON signal (ASIC) to High, and then turn on the power circuit. After PON signal is to High, sets external portof ASIC after approximately 100 ms. According to setting of this external port, carry out setting of the operating frequency andoscillation control in the ASIC. Also, it starts communication with ASIC, and confirms the system is operative.When the through image is operating, set the PAON signal (ASIC) to High and then turn on the CCD. When the through image isplaying, set the PAON signal to Low and then turn off the CCD. When LCD panel turns on, set BL ON signal at pin (41) to High,and turn on the backlight power.When the power switch is off, the lens will be stowed, and PON, PAON and BLON signals to Low and the power supply to thewhole system is halted. The 8-bit microprocessor halts oscillation of the main clock (4 MHz), and set operation mode of clockocillation (32.768 kHz).Table 5-2. Key Operation3. Key OperaitonFor details of the key operation, refer to the instruction manual.120 1 2 3SCANOUTSCANINUP1st (S1)TELE-LEFTWIDE2nd (S2)RIGHTGREENMENU0TESTDOWN4OKPLAYPW_ON