Memory Backup Circuit - Epson DFX-8000 Service Manual

Principles of Operation
+ 12 VDC Line Level

Memory Backup Circuit

POWER SUPPLY
SO SIGNAL
Figure 2-17. Memory Backup Circuit Block Diagram
2-30
Table 2-l 7. Power-On Reset Status
Q2 Status
off
On
BACK UP VOLTAGE
SUPPLY CIRCUIT
RESET signal
vx output
GND (0 V) LOW
HIGH
I
CPU
l
L