Canon MVX200 E Service Manual page 87

• Backup Lithium Battery
LI3V power from the lithium battery is input to pin 3 of the IC102, and it is output from pin 12 as power to the MODE MI-COM.
Thus, the MODE MI-COM performs data backup and clock operation when main power supply is not connected.
When the voltage of the lithium battery decreases below 2.6 V (or when the lithium battery is not loaded), the IC102 outputs the "L"
signal from pin 2. Upon receipt of this signal at the time of power-on, the MODE MI-COM sends it to the FR MI-COM, which then
issue a lithium battery low-level warning indication.
• Main Power Supply
Main power (DC-JACK/BATTERY) is supplied to pin 13 of IC102. Through the internal regulator in IC102, the main power thus
supplied is converted to 3V power, which is output as E3V from pin 14 of IC102. Furthermore, through the internal switch, the
main power is converted to LI3V, which is output from pin 12 of IC102 as a power voltage for driving the MODE MI-COM.
When main power is supplied, the "H" signal is output from pin 4 of the IC101. Upon detection of this "H" signal, the MODE MI-
COM recognizes the main power source has been provided. Then, the COM MI-COM carries out initialization and sets up the
standby state. In this state, the MODE MI-COM performs detection of startup-related switches. When it detects that any one of the
startup-related switches has been turned on, the CAM ON (H) and VTR ON (H) signals are output from pins 52 or 53, respectively.
Upon output of the CAM ON (H) and VTR ON (H) signals, power to each circuit is turned on.
At power-on of each circuit, a voltage of 2.7/2.5 V is fed to pin 5/7 of the IC102. Then, through the internal switch, power to the
MODE MI-COM is output from pin 12 for saving current consumption.
MVX250i E, MVX200i E, MVX200 E
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TECHNICAL DESCRIPTION