Panasonic KX-TD612NE, Руководство по обслуживанию, Страница: 21 / 126

presented to HWR1 of the up highway. /
/ / /
9. Back-Up Circuit
Composition: / BAT etc. / / Circuit Operation: / The real time clock
in the Gate Array and RAM are backed up by the lithium of
secondary battery (BAT) for 7 years. /
10. Voltage Watching Circuit
Composition: / Reset IC (IC115) etc. / / Circuit Operation: / Voltage
Watching Circuit is a security circuit which detects AC power off
and +5V turn off. / If AC power is turned off, Power Supply Unit
presents "Low" to I/O port in the CPU. / If +5V is turned off, Reset
IC (IC115) presents "Low" to reset pin of Gate Array to reset the
system. /
11. RS-232C Interface Circuit
Composition: / CPU (IC100), Driver/Receiver IC (IC108) etc. /
Circuit Operation: / RS-232C Interface Circuit is a circuit for
realizing the data transmission between CPU (IC100) and a
Personal computer/printer, etc. This circuit consists of a serial
interface built in CPU and the level conversion circuit. /
21