Epson PX-8 - Page 29

REV.-A
Other power circuits such as a switching circuit, which supplies the logic circuit power, are locat-
ed on the MAPLE board, in addition to the above. Fig. 2-3 is a block diagram which summarizes
the power supply circuits on the MAPLE board.
AC adaptor
()
~
7001
7508
Charge
control
,---J
I
F1
f-----6\9
Main
battery
-
Auxiliary
battery
~
G
ND
AID converter
To backup circuit
RS-232C supply
l-.a
power voltage
~
regulator
r GAH40S
~
VB
..
7508
~
[power control
I Slave CPU 6303
LCD power
Clock
voltage
generator
regulator
l'
L......-
ROM capsule
power voltage
regulator
I
GAH40S
¥
Fig. 2-3 Power Circuit Block Diagram
2-5
r.==-
+8V
~
-8V
(±10%)
-
-
,-
(
>-
Logic circuit
voltage supply
+5V)
Speaker amp.
-15V (± 10%)
+5V(±5%)
To microcassette