SECTION 502-304-101
Damage to the
transformer
may
result
if there is
sufficient
ground
potential
difference
between
power and telephone grounds.
Refer
to appropriate
section on bonding to power
grounds
in Division
460.
3.15 A 426N diode
must
be
installed
in
either
the
ACl
or
ADl
base
assembly
wJien
connecting
for
4-party
full
selective
or
8-party
semise
lective
ringing.
The
two
leads
from
the
diode
are
designated No. 1 and No.
2.
Lead No. 1
extends from the flanged (gold) base of the diode;
lead
No. 2
extends
from
the
housing
tip
of
the
diode. Place the diode
in
the opening provided
in
the
terminal
board
(Fig. 9).
Dress
the
leads
to
the
appropriate terminal board terminals,
refer
to
Table E for connections.
LEAD
N0
.
1-
"'ii"-----4!11!
!!!l~._.,...
,
426N
DIODE
Fig.
9-426N
Diode Installed
3.16
Where
extreme
noise induction conditions
exist,
the
426N diode will
not
be
used.
Instead,
a cold-cathode
tube
or
a
ringer
isolator
installed on a 7 4A connecting block may be used.
See
section
on
inductive
noise
for
connection
information.
3
.1
7
For
portable installations
of
the
ADl
telephone
base,
terminate
the
line
and
transformer
Page 6
wiring to 550A jacks
or
equivalent. Connect
the
spade-tipped leads
of
the D5AL or D5AN mounting
cord to a
505A plug. Connect other end
of
mounting
cord to
ADl
base
in
normal manner.
3.18
For
portable
installations
when
only
one
portable
telephone
set
is equipped with a
dial light, one
2012A
transformer
may be connected
to
two
or
more
jacks.
When
more
than
one
portable telephone
set
with dial
light
is installed,
ref
er
to section on station
transformers
for
selection
of proper power source.
On
2-party
tip
stations
requiring
ground
identification,
be
sure
that
the
jacks
and
plugs
are
instaJJed
in
accordance
with
the
section
on
jacks
and
plugs.
4.
OPERATION
4.01
Instruct
the
customer
on
the
necessary
operating features.
4.02 RecaJJ
Switch
(Fig. 1):
Point
out
recall
switch
and
explain
advantages
of
switch.
Example:
If
a
person
receives
busy
tone
at
conclusion
of
dialing a
number
, he
may
depress
the recall switch for a few seconds;
then
release.
Dial
tone
will
again
be
heard
.
This
is done in
place
of
depressing
line
switch
plunger
on
the
telephone base.
Caution:
If
the
recaJJ
switch
is
depressed
during
conversation
or
dialing,
central
office
equipment
ma
y
be
disconnected.
4.03
Demonstrate
the
three-step
ringer
volume
control.
Caution the customer
about
ringer
cutoff
if
the
screw
is
removed
to
provide
this
feature.
5.
MAINTENANCE
5.01
Maintenance
of
the
ACl
and
ADl
telephone
bases is limited to
ringer
bias
adjustment
,
burnishing or adjusting contacts, and replacement
of defective components.
5.02
For
adjustments
and
ringer
cutoff
feature
of
the
PlA
ringer,
refer
to the appropriate
ringer section in Division
501.
5.03 In areas where
RF
suppression is required,
replace
the
hand
telephone
set
with a
set
t
hat
has
been modified by
the
local
distributing
Q
0
0
0
0
0
0
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