Sanyo IDC-1000ZE Service Manual page 19

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 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 4-bit microprocessor supplies power to
the system as required.
The 8-bit microprocessor first sets both the P ON signal at pin (71) and the PA ON signal at pin (70) to high, and then turns on the
DC/DC converter. After this, Low pulse are output from pins (96), (98) and (97) in order so that the ASIC RISC CPU is set to the
active condition. If the LCD monitor is on, the LCD ON signal at pin (95) set to high, and the DC/DC converter for the LCD monitor
is turned on. Once RISC CPU processing is completed, the ASIC RISC CPU return to the reset condition, all DC/DC converters
are turned off and the power supply to the whole system is halted.
Supply voltage
Power OFF
Power switch ON-Auto power down
Power
Shutter switch ON
ON
Resolution, Flash,
Self timer switch ON
Supply voltage
Power OFF
Power switch ON-Auto power down
Take a picture
Power
ON
Download image
Continuous image
Message from host
Note) P. SAVE = Power save mode, 4 MHz = Main clock operation, 32 kHz = Sub clock operation
ASIC, RISC
memory
3.3 V, 2.5 V
No disc
Play back
LCD finder
Table 4-3. Camera Mode (Battery Operation)
ASIC, RISC
No disc
Erase image
Table 4-4. Host Mode (Battery Operation)
4bit
CPU,
CCD
CPU
3.2 V
3.3V(D) 5V(A)
(ALWAYS)
+15 V -8 V
OFF OFF 32KHz
OFF OFF
4MHz
OFF
ON 4MHz
OFF
OFF 4MHz
ON ON OFF 4MHz
OFF OFF
4MHz
ON ON 4MHz
CPU,
CCD
memory
5 V (A)
3.3 V
+15 V -8 V (ALWAYS)
OFF OFF
32 KHz
OFF OFF
OFF OFF 4 MHz
ON ON OFF 4 MHz
OFF
ON 4 MHz
OFF
ON 4 MHz
ON ON
4 MHz
ON 4 MHz
ON
– 19 –
MODE
LCD (EVF)
LCD MONITOR
3.2 V
5V (L)
(ALWAYS)
+12V etc.
OFF
OFF
ON OFF
ON ON/OFF
ON OFF
ON OFF
ON OFF
ON
ON/OFF
4bit MODE LCD (EVF)
CPU LCD MONITOR
3.2 V 3.2 V 5 V (L)
(ALWAYS) +12V etc.
OFF OFF
4 MHz ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
DRIVE
4.9V(D),3.15V(P),
4.9V(A),3.15V(D),
4V(H), 3.1V(A)
OFF
OFF
ON
OFF
ON
OFF
ON
DRIVE
↑
OFF
OFF
OFF
ON
ON
ON
ON
ON