user manual
ND-20292
CHAPTER 7
APRIL, 1990
730.5
SWITCH SW2 SETTING
When installing the LCR-E ETU, turn SW2 to the
OFF
position. This will allow the insertion or removal
of the LCR-E ETU into the slot without powering down
the CCU. After installing the LCR-E ETU in the CCU,
turn SW2 to the ON position.
When the LCR-E ETU is installed without power
applied to the CCU, SW2 must be set to the ON
position before applying power to the CCU. See Figure
700-l LCR-E ETU Switch/LED Layout and Figure
700-12 Busy In/Out Switch SW2.
ON
-......
OFF
SW2 BUSY IN/OUT
Figure 700-12 Busy In/Out Switch SW2
730.6 ROUTING THE RS-232C CABLE
Route the RS-232 Connector ended cable down and to
the right side of the CCU to avoid any interference
with the insertion and removal of other ETUs. See
Figure 700-l LCR-E ETU Switch/LED Layout and
Figure 700-9 Installing the LCR-E ETU.
730.7 MOUNTING THE RS-232C CONNECTOR
Mount the RS-232C connector (in one of the openings
made accessible after removing the knock out with
screws and nuts (locally provided). See Figure 700-13
Mounting the RS-232C Connector.
730.8 VERIFYING SW2 SETTING
If the LCR-E ETU was installed with power applied to
the CCU, verify that SW2 switch is set to the ON
position (ifrequired, turn ON).
SECTION 740
INSTALLATION OF PC-8300
740.1 GENERAL
The PC-8300 is powered by four AA size (1.5 volt)
batteries. An optional NiCad (nickel cadmium)
Battery Pack (PC-8201-90) is also available for use in
place of the regular battery pack.
There is a backup system which consists of internal
NiCad batteries which automatically switches on for
emergency use. These batteries charge continuously
whenever the computer is operating normally.
RS-232C CONNECTOR
RIGHT SIDE VIEW OF CCU
Figure 700-13
Mounting the RS232C Connector
While the PC-8300 is in a storage condition, the
backup batteries can maintain the contents of the
RAM for up to 30 days, depending upon the amount of
RAM installed. Keep in mind that these batteries
cannot actively operate the PC-8300 for very long.
If the main batteries have a low charge, causing the
backup battery system to be used, the LOW BATTERY
LED indicator on the PC-8300 will light up. The
batteries should be changed when this indicator lights
up, since the PC-8300 can only be operated for
approximately 20 minutes from this point. Storing the
PC-8300 for a long time with a low charge will cause it
to become inoperable.
NOTE
1:
NOTE 2:
If the PC-8300 is operated with the Low
Battery Indicator lit up for more than 20
minutes, the unit will become inoperable
and all the data stored in RAM will be lost.
Batteries should be replaced as soon as
possible after the LOW BATTERY LED
lights up. The power switch should always
be turned OFF during change of batteries.
740.2
AC POWER ADAPTER
The AC power adapter (PC-8271A-01) converts 120
volts AC to 8.5 volts DC, which is used to operate the
PC-8300. This may be used when an outlet is available
in order to prolong the life of the batteries.
NOTE
1: When connecting the AC power adapter to
the PC-8300 ALWAYS plug the adapter into
the wall outlet before connecting it to the
unit. For disconnection, the adapter
700-6