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PRACTICE 512-6261-200
CHART2
FAULT
.
L OCATION GUIDE
FAULT INDICATION
Indicator lamp does not light.
No speech or dial tone on loudspeaker.
Indicator lamp is extinguished when transmitting
with no receive signal present.
Speech remains on loudspeaker or lamp remains lit
when handset is
lifted.
Far-end party hears speech with MUTE key de-
pressed.
No receive speech heard with MUTE key depressed.
When ON key
is
depressed. speech remains on
loudspeaker or audio transmission
continues.
When OFF key
is
depressed. indicator lamp
remains
lit or speech remains on
loudspeaker.
When OFF key is depressed. indicator lamp remains
lit or speech remains on
loudspeaker.
If
on-hook dialing is
provided.
dial tone remains on
loudspeaker after dialing first digit.
On multiline telephone sets equipped with hold
feature. hold does not
work.
With on-hook dialing. dial pulses heard on loud-
speaker.
ACTION
Hold ON key
depressed.
Indicator lamp should
light; if not lit:
• Check power transfonner connections
• Check power source
• Check transformer output.
If fault remains. it is a circuit defect Replace control
module.
Lift handset. check for presence of
speech.
If
speech
is present:
• Check ring and tip connections from telephone
• Check that P3 and P4 leads are not shorted
• Check connections from acoustic unit to control
module.
If
fault
remains.
replace control module or acoustic
unit.
This is a circuit defect. Replace control module.
Check connections in telephone set. If fault remains.
replace control
module.
Replace control
module.
Replace control
module.
Replace control
module.
Repl ace control
module.
Rt-place control module.
Check normal handset
dialing.
Also check tip and
ring
connections
from telephone set to control
module.
If fault
remains.
replace control module.
Check that hold feature works with handset and
check connections in telephone set.
If fault remains. replace control
module.
Check P3 and P4 connections in telephone set.
If fault
remains.
replace control
module.
Page 11
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