Nikon Coolpix 4300 Repair Manual

Also see for COOLPIX 4300: User guide Quick start guide

Contents

VAA12901-R.3594.A- E7 ･ E4300 -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, a regu-lated 3.2 V voltage is normally input to the 8-bit microprocessor (IC301) by IC302, so that clock counting and keyscanning is carried out even when the power switch is turned off, so that the camera can start up again. When thebattery is removed, the 8-bit microprocessor opererates in sleep mode using the memory backup capacitor. At thistime, the 8-bit microprocessor only carries out clock counting, and waits in standby for the battery to be attachedagain. 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, andthen turns on the DC/DC converter. After this, High signals are output from pins (64) and (63) so that the ASIC andthe SPARC lite are 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 SPARC lite processing is completed, the ASICand the SPARC lite return to the reset condition, all DC/DC converters are turned off and the power supply to thewhole system is halted.SPARCLiteASIC,memoryRS232Cdriver CCD 8 bitCPULCDMONITORPower voltage 3.3 V 3.3 V 3.3 V 5 V (A)+15 V -7.5 V3.3 V(ALWAYS)5V (L)+12V etc.SLDOFF OFF OFF OFF OFF 32 KHz OFFPLAY ON ON ON OFF 3 MHz ONM-RECA-RECPower switch ON-Auto power OFF OFF OFF OFF OFF 3 MHz OFFShutter switch ON ON ON ON ON↔OFF 3 MHz OFFMOS, QSW, SBM etc. ON OFF OFF OFF OFF 3 MHz OFFLCD finder ON ON ON ON 3 MHz ONTable 4-3. Camera ModeSPARCLiteASIC,memoryRS232Cdriver CCD 8 bitCPULCDMONITORPower voltage 3.3 V 3.3 V 3.3 V 5 V (A)+15 V -7.5 V3.3 V(ALWAYS)5V (L)+12V etc.SLDOFF OFF OFF OFF OFF 32 KHz OFFM-RECA-RECPLAYPower switch ON-Auto power OFF OFF OFF OFF OFF 3 MHz OFFTake a picture ON ON ON ON↔OFF 3 MHz OFFErase image ON ON ON OFF 3 MHz OFFDownload image ON ON ON OFF 3 MHz OFFContinuous image ON ON ON ON 3 MHz OFFMessage from host ON ON ON OFF 3 MHz OFFNote) 3 MHz = Main clock operation, 32 kHz = Sub clock operationTable 4-4. Host Mode