Panasonic KX-TH1211B Service Manual page 24

KX-TH1211B/KX-TH1212B/KX-TGA930T
4.9.4. Reset Circuit
Function:
This circuit is used to initialize the microcomputer when it incorporates an AC adaptor.
Circuit Operation:
This circuit consists of the following blocks.
• Circuit shaping the voltage from AC adaptor (IC301, etc.)
• Circuit splitting the reset signal into each IC such as DSP and Memory (IC502)
• Circuit making the power down signal
When the AC Adaptor is inserted into the unit, the voltage is shifted by IC303 and IC305. IC303 and IC305 are for DSP (IC501),
and IC305 is for the external memories (FLASH (IC502)).
Cross Reference:
Bottom Side View (P.120).
24