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Bell System Practices TOUCH-A-MATIC 2872A1M Identification, Installation, Connections, Operation, And Maintenance page 54

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SECTION
503-603-101
@TABLE N (Contd)@
TROUBLE
ANALYSIS
- 2872AIM
OR 2872A2M
L
, ,
,
TROUBLE
FAILURE
ADDITIONAL SYMPTOM
POSSIBLE CAUSE
REMEDIAL ACTION
NUMBER
,,
,
,
.
. ,
16
Cannot
turn speaker-
Speakerphone
turns off
Black strap
lead to
Remove
the strap lead
phone
off
when OFF button
is
PSB-27
was not
(Wired for one-touch
depressed
but turns on
insulated
and stored
option)
when OFF button
is
released
.,_
Speakerphone
turns off
Defective
output
logic
Replace
memory
and stays off when (Y-
level from memory
BL) lead is disconnected
PWB
from
terminal
27 on
PSB and OFF button
is
depressed
Speakerphone
turns off
Defective
circuit
on
Replace
dial tone detector
board
when handset
is taken
D-180493
Kit of
assembly
of D-180493
Kit of
off-hook
but turns on
Parts
Parts
when handset
is placed
on-hook
17
Speakerphone
does
MB7 relay does not
Battery
not plugged
Plug battery
in
not turn
on when a
operate
(no click
in (2872A2M
set)
memory
button
is
heard)
when memory
3B (MD)speaker-
Insulate
and store
V-BR lead, and
momentarily
de-
button
is depressed
phone"
V-BR lead
connect
O-V lead to PSB-34
pressed
in the auto-
connected
to PSB-34
matic dialing
mode
(Wired for one-
4A speakerphone
in-
Ch'xnge to 82B connecting
block
touch
option)
stalled
using 82A con-
necting
block
4A speakerphone
with
Add strap from
terminal
10 to 35
82B block
strap not
in 82B block
placed
on 82B block
With temporary
strap
be-
One-touch
calling
1. Turn one-touch
calling switch
tween screw terminals
switch
turned
off or
on
28 and 29 on PSB, spea-
defective
2. Replace
one-touch
calling
kerphone
turns on when
switch
assembly
of D-180493
a memory
button
is
Kit of Parts
depressed
Defective
dial tone
Replace
dial tone detector
PWB
detector
D-180493
assembly
of D-180493
Kit of
Kit of Parts
Parts
With temporary
strap
Defective
connec-
Check
(Y-G) and (G-Y) leads to
between
screw termi-
tions between
dial
PSB terminals
17 and 34,
nals 17 and 34 on PSB,
tone detector
and
respectively
speakerphone
turns on.
PSB
Defective
dial tone
Replace
dial tone detector
PWB
detector
D-180493
assembly
of D-180493
Kit of
Kit of Parts
Parts
18
Delay time
between
Defective
timing
1. Replace
memory
depression
of a
circuit
2. Replace
dial tone
detector
memory
button
and
PWB assembly
of D-180493
initiation
of auto-
Kit of Parts
matic dialing
ex-
ceeds 3 seconds
(Wired for one-
touch
option)
*Refer
to 6.02 (4).
Page
54

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