Power Supply - NEC PC-8201 Service Manual

I -
(
44
POWER
Ground
Ground
Remarks
Clock
Pin number
43
RAM Protect signal
I
45
46
1
47
1
NC
NO
Connection
I
Signal name
CLK
GND
GND
3.2.2
Power Supply
The PC-8201 can operate with the three types of power supply.
4 8
(1) SUM-3 dry cells (Four)
AM-3 (Alkali Manganese dry cell)
This can be used for more than 18 hours.
(Normal: at standby: 16K RAM)
SM-3 (Manganese dry cell)
This can be used for more than 6 hours.
(Normal: at standby: 16K RAM)
N C
(2) Ni-Cd battery PC-820 1-90
This can be used for more than 5.5 hours.
(Normal temperature: at standby: 16K RAM)
I t is possible to floating charge.
charge 48
M
No time limit for recharging
I t is charged in spite of power on or off of the PC-8201.
No Connection
(3)
AC adapter PC-8271-01
The AC adapter specifications are based on the functional specifications of the
PC-827 1-0 1.
The PC-820 1 has an EMERGENCY battery.
Backup time:
System equipped with 64K
More than 7 days (Norn~al)
System equipped with 16K
More than 26 days (Norn~al)
Battery is changed by AC adapter or operation battery.
A backup power switch can disable to backup or floating charge.