NEC nd-20292 manual Radio Frequency Interference RFI

ND-20292

CHAPTER 5

APRIL, 1990

Bl

Radio Frequency Interference (RFI)

Test to see	if	interference	is only	during	outside
calls	or	anytime	a station	is off-hook.

Check

CO

system

at

MDF

Multiline

Terminal

Check

cable

of affected

MultilineTerminal(s)

IL

Inform

More

TELCO

than

2 pair

Ground

all

unused

Twisted

Twisted

Pair

No

Recable

with

2-pair

twisted

cable

Cable

pairs

at

MDF

0

*

2

Pair

Twisted

rYes

I End

No No Yes

Follow the steps below, one at a time and test after each. (Refer to ETI No. MK-006 in Chapter 6.)

1.Place a 0.01 microfarad (yF) capacitor across the receiver element in the

Multiline Terminal handset.

2.

Place

a 0.01

microfarad

(pF)

capacitor

across

pins

1

& 2

and pins

3 & 4

of

the

handset

connector

harness

on the

solder

side

of

the

main

PC

board

in

the

Multiline

Terminal.

500 -9