Operation; Start-Up Operation; Power-Off Operation; Photography Mode (Movie) - Toshiba GSC-R60 Service Manual

FPC_TOP consists of connector that connects the camera and CRADLE main board.

3-3. Operation

3-3-1. Start-Up Operation

From AC adapter
The start-up operation begins by pressing the POWER button or by opening the LCD monitor while AC
adapter is securing the power supply either from the DC jack on the camera or the cradle. (The status is
monitored by UL33.)
The 1.63 voltage will appear on the power monitor line (DCP) from the AC adapter of the
sub-microcomputer on the POWER board while the AC adapter is securing the power supply. (The status
is monitored by UL33.) If the start-up operation begins under this condition, the AC adapter power switch
(DCON) will become active by the sub-microcomputer and start supplying the power to the power supply
circuit. And then, the sub-microcomputer will activate the switch that makes each voltage valid (1.5V, 1.2V,
5V, 2.5V and 3.3V), and the power supply circuit starts supplying the power to the Main board. Resetting
of CPU on DSP will be deactivated when the reset deactivation voltage is applied to the reset IC on the
Main board, and then the CPU starts working.
From battery
The sub-microcomputer activates the start-up operation from the battery with the POWER button pressed
or with the LCD monitor opened when there is no power supplied by the AC adapter but a battery attached
with sufficient power level remained. (The status is monitored by UL33.)
If there is no power greater than 9V detected from the AC adapter (or when the AC adapter is not
connected), the sub-microcomputer activates the battery switch (BATON1, BATON2) and supplies the
power to the power supply circuit. This is performed only when the battery can provide the voltage greater
than its specification to the power line. Then, the sub-microcomputer will activate the switch that makes
each voltage valid (1.5V, 1.2V, 5V, 2.5V, 3.3V, etc.). After that, the power supply circuit starts supplying
the power to the MAIN board. Resetting of CPU on DSP will be deactivated when the reset deactivation
voltage is applied to the reset IC on the MAIN board, and the CPU starts its operation.

3-3-2. Power-Off Operation

When DSP sends the command to turn off the power, the sub-microcomputer turns the switch LOW for
each voltage (1.5V、1.2V、5V、2.5V、3.3V, etc.) and the power supply circuit stops supplying power to the
MAIN board. The power switch for the AC adapter and battery will be turned to LOW, and then the power
supply to the power line will be stopped.

3-3-3. Photography Mode (Movie)

After the digital conversation by the AD converter on the CCD-HEAD, DSP converts the CCD signal to
YCrCb signal. The YCrCb signal is sent to the MPEG2 coder and converted into MPEG2 data. Then after
sending back to DSP, the signal is sent to the HDD or the SD card and saved.

3-3-4. Photography Mode (Still image)

After the digital conversation by the AD converter on the CCD-HEAD, DSP converts the CCD signal to
YCrCb signal. The JPEG encoder converts the YCrCb signal into JPEG signal. Then the signal is sent to
the HDD or the SD card and saved.

3-3-5. Playback Mode (Movie)

The video data stored in the HDD or the SD card is sent to DSP, and then sent to the MPEG coder for the
conversion to YCrCb signal. The YCrCb signal is sent to the video encoder inside of DSP, and amplified
by the video amp. Then the signal will be output as a video signal. The same signal will be sent to the LCD
board and be displayed on the LCD monitor.

3-3-6. Playback Mode (Still Image)

The still image data stored in the HDD or the SD card will be sent to DSP, and then decoded by the JPEG
coder inside of DSP for the conversion to YCrCb signal. The YCrCb signal will be sent to the video
encoder inside of DSP, and amplified by the video amp. Then, the signal will be output as a video signal.
The same signal will be sent to the LCD board and be displayed on the LCD monitor.

3-3-7. USB Communication

Under USB mode, DSP starts communicating with an external USB device through a USB interface inside
of DSP. The DSP checks power terminal of the USB terminal on the cradle, and detect a USB connection.
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