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

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).
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