2-49
2.1.17.3 Battery backup circuit
This system is provided with a battery backup function to be available in case of a service interruption, with a battery connected
to the power unit.
The battery backup circuit is used for functional ON/OFF control with the aid of software.
The software checks the battery voltage (BATT_VOLT) and switches on the required function when the voltage is found to be
above the specified level.
When the function is turned ON and the AC power supply is turned OFF (AC_ON signal turned low), the BATT_ON signal is
turned high and +5V, +3.3V, and +5VCPU (about 8V) are supplied from the battery in the power unit.
Since the supply of +12V is effected, the Back-Lite of the LCD cannot be lit up.
The backup feature is canceled in the following 3 cases:
• When the function is switched OFF with software.
• When forced OFF is executed from hardware in 2 to 5 minutes (set by software) after the start of backup action.
• When the battery voltage lowers and the +5V voltage is found to be below the specified level (approx. 4.2V).
Battery charge is conducted inside the power unit while the AC power supply is ON.
The battery to be used is of the nickel-cadmium type of 7.2V (1.2V
×
6 cells), 1500mA.
The control circuit is accommodated in the GATEARRAY.
For more details, refer to the instruction manual for the GATEARRAY and the internal equivalent circuit.
Summary of Contents for JS-170FR Series
Page 2: ......
Page 10: ......
Page 30: ...1 20 ...
Page 80: ...2 50 ...
Page 101: ...3 17 LCD DISPLAY TEST 6 Video Test ENTER 1 OK or 2 NG ...
Page 134: ...4 JS 170FR PCB s 4 1 Main PCB 4 1 1 Main PCB Schematic Diagram 1 10 4 1 ...
Page 135: ...4 1 1 Main PCB Schematic Diagram 2 10 4 2 ...
Page 136: ...4 1 1 Main PCB Schematic Diagram 3 10 4 3 ...
Page 137: ...4 1 1 Main PCB Schematic Diagram 4 10 4 4 ...
Page 138: ...4 1 1 Main PCB Schematic Diagram 5 10 4 5 ...
Page 139: ...4 1 1 Main PCB Schematic Diagram 6 10 4 6 ...
Page 140: ...4 1 1 Main PCB Schematic Diagram 7 10 4 7 ...
Page 141: ...4 1 1 Main PCB Schematic Diagram 8 10 4 8 ...
Page 142: ...4 1 1 Main PCB Schematic Diagram 9 10 4 9 ...
Page 143: ...4 1 1 Main PCB Schematic Diagram 10 10 4 10 ...
Page 144: ...4 1 2 Main PCB Parts Location 4 11 ...
Page 145: ...4 2 MB PCB 4 2 1 MB PCB Schematic Diagram 4 17 ...
Page 146: ...4 18 4 2 2 MB PCB Parts Location ...
Page 148: ...4 3 Peripheral PCB 4 3 1 Peripheral PCB Schematic Diagram 4 20 ...
Page 149: ...4 21 4 3 2 Peripheral PCB Parts Location ...
Page 152: ...5 2 Main PCB 75 Peripherals ...
Page 153: ...5 3 Power Supply Peripherals ...
Page 154: ...5 4 Customer Display Peripherals ...
Page 155: ...5 5 LCD Peripherals ...
Page 156: ...5 6 Inverter PCB Peripherals ...
Page 161: ...Printed in Japan ...