NEC nd-20292 manual Section Installation of PC-8300

ND-20292

CHAPTER 7

APRIL, 1990

730.5SWITCH 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

730.6ROUTING 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.

730.7MOUNTING 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.

730.8VERIFYING 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

740.1GENERAL

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: 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.

NOTE 2: 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.

740.2AC 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